JPH0241969A - Collision preventing device for truck - Google Patents

Abstract

PURPOSE:To prevent collision of a truck by transmitting the relative movement of a bumper member to a truck main body through a transmission mechanism to a connecting member, thereby releasing the driving connection with a drive transmission member. CONSTITUTION:When a bumper member 240 at the forward end of a truck collides with an obstacle to be moved in the direction of an arrow 280 with respect to a truck main body 6, shafts 248, 250 are turned through link members 252, 254 and an opening lever at the other end thereof turns a revolving member to release the driving connection of a connecting pin 68 with an engaging finger 34 of a driving chain 24, so that the movement of the truck is stopped. The forward end roller 302 of a pressing member 300 is forced to act on a plate spring member 292 by the turning movement of the shaft 250 and the member 292 is turned downward to make a brake member to act on the floor, whereby a truck main body 6 is suddenly braked. Thus, it is possible to prevent a truck from colliding with an obstacle.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a collision prevention device that prevents collisions of carts moving along an assembly line.

<Prior art and its disadvantages> For example, in an assembly line for a copying machine, a plurality of work carts are moved along an endless movement path from an assembly start area to a product delivery area through a plurality of assembly areas and adjustment areas. . In the assembly start area, the frame of the copying machine (the frame on which various parts are not attached) is placed on a trolley. While the truck is moved through each assembly area, various parts are attached to the frame body, and while the truck is moved through each adjustment area, various parts attached to the frame body are attached to the frame body. Various adjustments are performed. When the cart is moved to the product delivery area in this manner, substantially all the components are assembled to the frame body on the cart, and adjustments to the various assembled parts are also completed. In the product unloading area, the assembled copying machine as a product is unloaded from the trolley and packed in a packaging box as required.

In such an assembly line, when the working time in the assembly area and adjustment area is relatively long, the carriage is moved intermittently instead of being moved continuously. If the working time in the assembly area and adjustment area is not constant, a drive release means is provided corresponding to each assembly area and adjustment area, and the movement of the cart is stopped by the drive release means during the work, After the work is completed, the carts are connected again and moved. When moving one trolley this far,
There is a risk that a following truck will collide with a truck that is stopped in the assembly area or adjustment area, and such a collision will make it difficult to assemble or adjust the copying machine as required. Furthermore, if the cart collides with a worker, it is not desirable for safety, and furthermore, if the cart collides with objects in the factory, there is a risk that the cart itself may be damaged.

<Object of the Invention> The present invention has been made in view of the above facts, and its main purpose is to provide a collision prevention device for a truck that can reliably prevent collisions of a truck.

<Summary of the Invention> According to the present invention, a collision between a drive transmission member that is moved in a predetermined direction and a truck that is moved by the action of a connecting member that is provided on the truck body and that is releasably drivingly connected to the drive transmission member is achieved. The prevention device includes a bumper member that is relatively movably mounted on the front end of the truck body, and a transmission mechanism that transmits relative movement of the bumper member to the connecting member. When moved relative to the trolley body,
There is provided a collision prevention device characterized in that movement of the bumper member is transmitted to the connection member via the transmission mechanism, thereby releasing the driving connection between the connection member and the drive transmission member.

In such a collision prevention device, when the truck body collides with an obstacle such as a truck, the bumper member is moved relative to the truck body, and this movement of the bumper member causes the drive connection between the coupling member and the drive transmission member to be established. The vehicle is released, thus stopping the truck body and preventing it from colliding with an obstacle.

·<Concrete example> Further details will be given below with reference to the accompanying drawings.

In FIG. 1 illustrating a part of an assembly line using trolleys equipped with an integrated example of a collision avoidance device according to the invention, the assembly line shown is provided with guiding means 2 extending as required, and the working trolley designated by the number 4 is The carriage 4, which is moved as required while being guided by the guide means 2, has a rectangular carriage body 6.
The truck body 6 is equipped with a lift mechanism (not shown).
A lifting platform (not shown) is attached to the platform so that it can be moved up and down,
Casters 12 having rotatable rollers 10 are attached to the four corners of the bottom of the cart body 6, on which a rectangular work table 8 is rotatably attached. These four casters 12 are composed of swivel casters that are rotatable around an axis extending in the vertical direction and can change direction.

Further, an operation unit 14 is attached to the lifting platform (not shown), and the operation unit 14 is provided with an operation panel 16 on which various operation switches are arranged. This trolley 2
is substantially the same as that disclosed in the specification and drawings of the patent application (named 2 work trolley) filed by one of the applicants (Sanda Kogyo Co., Ltd.) on July 20, 1988,
Reference is therefore made to the above specification and drawings for details thereof.

Further, the guide means 2 includes a base plate 18 fixed to a factory floor or the like, and a pair of guide members 20 and 22 fixed to the upper surface of the base plate 18. Referring also to FIG. 6, in the embodiment, guide members 20 and 22 include chain guides 20a and 22a extending substantially vertically upwardly from the top surface of base plate 18;
It includes roller guide portions 20b and 22b provided at the upper end, and defines a guide groove with an open upper surface between the roller guide portions 20b and 22b.

Between the pair of guide members 20 and 22 is a drive chain 24 (constituting a drive transmission member) for moving the trolley 4.
is installed. Referring to FIGS. 2 and 3 together with FIG. 6, the illustrated drive chain 24 is endless, with a pair of inner link plates 26 and a pair of outer link plates 28 connected alternately. A pair of inner link plates 26 and a pair of outer link plates 28 which are adjacent to each other are rotatably connected via a pin 30, and a pin 30 is fitted between the pair of inner link plates 26, and a roller 32 is rotatably mounted. Furthermore, an engaging pawl 34 and a support roller 42 are provided on a plurality of specific pairs of outer link plates 28 (for example, outer link plates arranged at intervals of five outer link plates). That is, an engaging pawl 34 projecting upward is fixed to one of the upper sides of the pair of outer link plates 28 by means such as welding.

The drive chain 24 is moved in the direction indicated by an arrow 36 (FIGS. 1 and 2) by the action of a drive source such as an electric motor, and when viewed in the direction of movement, there is a circle in front of the engagement pawl 34 in the direction of movement. An arcuate recess 34a is formed (Fig. 3),
The recess 34a corresponds to the peripheral surface shape of a connecting pin, which will be described later, and acts to engage the connecting pin and push it in the direction indicated by the arrow 36. In addition, a pair of outer link plates 2
A mounting block piece 38 projecting downward is fixed to the other side located below 8 by means such as welding, and a support roller 42 is rotatably attached to the mounting block piece 38 via a pin 40. . In such a drive chain 24, as shown in FIG. 6, when the drive chain 24 moves between the guide members 20 and 22, the rollers 32 move while being guided by the inner surfaces of the chain guide parts 20a and 22a, and also support and The rollers 42 move in contact with the upper surface of the base plate 18.

The truck 4 and the drive chain 24 are drivingly connected as follows. With reference to FIGS. 4 to 6, in the specific example, the trolley 4
A revolving body designated by the number 44 is provided at the front end of the main body 6 of the truck. The rotating body 44 includes a pair of main body plates 46 and 48 that are spaced apart from each other in the vertical direction, and an arm 50 that is disposed between the pair of main body plates 46 and 48.

A block piece (not shown) is fixed between one end of the pair of main body plates 46 and 48. On the other hand, the trolley body 6
A mounting bracket 52 is fixed to the left front end (the upper right end in FIGS. 1 and 4) of the (direction perpendicular to , horizontal direction in Figure 6)
A pair of bracket pieces 54 are provided at intervals, and a block piece (not shown) provided between the main body plates 46 and 48 is rotatably mounted between the bracket pieces 54 via a shaft member 56. There is. Further, the arm 50 is rotatably connected to a longitudinally intermediate portion of the pair of main body plates 46 and 48 via a pin 58 extending in the vertical direction. The arm 50 has a horizontal base 60 extending generally horizontally from the body plates 46 and 4B, as clearly shown in FIG.
a, a vertical intermediate portion 60b extending substantially vertically upward from one end of the horizontal base portion 60a, and a horizontal tip portion 60c extending substantially horizontally from the upper end of the vertical intermediate portion 60b; the horizontal tip portion 60C has a bolt 62 and A guided roller 66 and a connecting pin 68 (constituting a connecting member) are attached by a nut 64 . The guided roller 66 is rotatably attached to the lower surface of the horizontal tip portion 60G via a spacer 70, and the connecting pin 68 is disposed below the guided roller 66 and projects downward. The guided roller 66 is disposed corresponding to the roller guide portions 20b and 22b in the guide means 2, and moves while being guided by the inner surfaces of the roller guide portions 20b and 22b. Further, the connecting pin 68 can engage with a plurality of engagement claws 34 provided on the drive chain 24, and these engagement claws 34 can be engaged with each other.
is drivingly connected to the drive chain 24 by releasably engaging one of the two.

Buffer means 72 and 74 are provided on the front and rear sides of the arm 50. In the specific example, a rectangular protruding piece 76 is integrally provided in the middle part of the arm 50, one buffering means 72 is disposed on the front side of this protruding piece 76, and the other buffering means 74 is disposed on the rear side. is installed. Buffer means 7
2 is constituted by a well-known cylinder-type shock absorber, and is attached to a mounting plate 78 mounted between the other end portions of a pair of main body plates 46 and 48.

This buffer means 72 is used when the trolley 4 is started, etc.
When an impact in the direction shown in FIG. 4 acts on the arm 50, it acts on the protruding piece 76 to buffer the impact. Also,
The other buffer means 74 is made of a rubber member that can be made of synthetic rubber, for example, and is attached to a mounting member 82 attached to the upper surface of one end of the main body plate 46 . The buffering means 74 acts on the protruding piece 76 to buffer the impact when an impact in the direction indicated by an arrow 84 (FIG. 4) is applied to the arm 50. A hanging piece 86 that hangs downward is fixed to the vertical intermediate portion 60b of the arm 50, and a roller 90 is rotatably attached to the lower end of the hanging piece 86 via a short shaft 88.

The above-mentioned revolving body 44 is arranged in the width direction (i.e., the guide means 2
A shaft member 5 extending in a direction (substantially perpendicular to the guide groove)
6 as the center, it can freely rotate between the connected position shown in Figures 1, 4, and 6 (also the position shown by the solid line in Figure 5) and the released position shown by the two-dot chain line in Figure 5. . In the above connection position, the connection pin 68 provided on the arm 50 of the revolving body 44 is located in the guide groove of the guide means 2 and protrudes into the movement path of the engagement pawl 34 of the drive chain 24, causing the movement of the drive chain 24. As a result, the engaging claw 34 and the connecting pin 68 are releasably engaged. Further, in this connected position, the guided roller 66 is positioned between the roller guide portions 20b and 22b of the guide means 2.

On the other hand, when the revolving body 44 is brought to the release position, the guided roller 66 and the connecting pin 68 move upward, and the guided roller 66 comes off the guide groove of the guide means 2, and the connecting pin 68 moves upward.
8 retreats from the movement path of the engagement pawl 34 of the drive chain 24, and the engagement between the connecting pin 68 and the engagement pawl 34 is released. At this time, the connecting pin 68 is located between the roller guide portions 20b and 22b without completely coming off the guide groove of the guide means 2, and the truck 4 does not move off the assembly line.

In an embodiment, the rotating body 44 can be pivoted beyond the release position further upwardly as indicated by arrow 92 (FIG. 5) to a disengagement position (not shown). In this detached position, both the guided roller 66 and the connecting pin 68 provided on the revolving body 44 detach from the guide groove of the guide means 2.

In the specific example, a connection position holding means 94 for holding the rotating body 44 in the connection position is also provided. Referring mainly to FIG. 5, the illustrated connection position holding means 94 includes a first holding means 96 disposed on the outside and a second holding means 98 disposed on the inside. A support plate 100 is attached to the front end of the truck body 6, a mounting block piece 102 is fixed to the support plate 100, and a first holding means 96 and a second holding means 98 are attached to the mounting block piece 102. has been done. First holding means 9
6 has a screw shaft 104 that is screwed onto a mounting block piece 102 so that the height can be adjusted freely, and a locking nut 106 is screwed onto the loose screw shaft 104, and the tip of the screw shaft 104 is fitted. A coil spring 10B is interposed between the locking nut 106 and the main body plate 48 of the revolving body 44. Therefore, by changing the position of locking nut 106, coil spring 108
The biasing force acting on the rotating body 44 can be adjusted. Note that the nut 110 is for fixing. Also, the second
The holding means 98 has a screw shaft 112 that is screwed onto the mounting block piece 102 so that the height can be adjusted freely, and a rubber member 114 that can be made of synthetic rubber, for example, is provided at the tip of the screw shaft 112. There is. Note that the nut 116 is also for fixing. These first holding means 96 (particularly the coil spring 108) and second holding means 98 (particularly the rubber member 114) act on the lower surface of the rotating body 44, and as can be understood from FIG. The second holding means 96 mainly functions as a buffer, and the second holding means 98 mainly functions as a positioning means for holding the rotating body 44 in the connected position. Furthermore, as is easily understood, the revolving body 44
is pivoted downward toward the connected position and the first retaining means 96
When it comes into contact with the second holding means 9B, the impact caused by this contact is buffered by the coil spring 108 and the rubber member 114.

In the specific example, a guided means 118 is also provided at the rear end of the cart body 6 so that the cart 4 can be reliably moved along the guide groove of the guide means 2. Referring to FIG. 7 together with FIG. 1, the illustrated guided means 11B includes a first member 120 attached to the rear end of the truck body 6 and a pin 122 connected to the tip of the first member 120. The second member 124 is rotatably mounted around an axis extending in the front-rear direction. A plate piece 12 is provided on the lower surface of the tip of the first member 120.
6 is fixed, and this plate piece 126 is attached to the second member 12
It extends to the base of 4. Furthermore, a substantially triangular abutment piece 128 is fixed to the upper surface of the base of the second member 124 . Furthermore, a bolt 130 is attached to the tip of the second member 124.
A guided roller 136 is rotatably attached to the nut 132 via a spacer 134. With this structure, when the second member 124 is pivoted clockwise as indicated by the arrow 138 to the operating position shown in solid lines in FIG. The member 124 is held in the operative position.

In this working position, the second member 124 extends substantially horizontally following the first member 120, and the guided roller 136 provided at the tip thereof engages the roller guide portion 2 of the guide means 2.
0b and 22b (at this time, the guided roller 136 is located above the engaging pawl 34 provided on the drive chain 24 and does not engage with the engaging pawl 34).

On the other hand, when the second member 124 is turned counterclockwise as indicated by the arrow 140 to the release position indicated by the two-dot chain line in FIG. The second member 124 is held in the detached position.

In this detached position, the second member 124 extends inwardly and is guided by a guided roller 136 provided at its tip.
is removed from the guide groove of the guide means 2.

Note that since the guided means 11B is disposed at the rear end of the trolley body 6 (particularly at the rear end at the side opposite to the lower side in FIG. 1 where the worker is located), It is not easy for a person to directly rotate the second member 124 and position it at the working position or the disengaging position. Preferably, the second member 124 is brought into the operative position or the disengaged position.

Referring again to FIG. 1, the above-mentioned assembly line is provided with a power supply mechanism for supplying current to the carriage 4 moving along the guide means 2. As shown in FIG. The illustrated power supply mechanism includes a power supply means 142 disposed along the guide means 2 and a current collection means 144 provided on the truck body 6. The power supply means 142 has a power supply rail 146, and the power supply rail 14
6 is a member 14 whose surface other than the surface facing the trolley 4 is a cover.
Covered by 8. In addition, the current collecting means 144 is attached to a first arm 150 attached to the trolley body 6 and to the tip of the first arm 150 so as to be able to pivot in the front and rear directions about an axis extending in the up and down direction via a bottle. A current collecting terminal 156 is attached to the tip of the second arm 152 via a current collecting arm 154. When the second arm 152 is in the active position shown in FIG. When positioned at a position (not shown), the electrical connection between current collection terminal 156 and power supply rail 146 is broken. This power supply mechanism is disclosed in the specification and drawings of a patent application (name: power supply mechanism in assembly line) filed by one of the applicants (Mita Kogyo Co., Ltd.) on July 12, 1986. They are substantially the same and therefore reference is made to the above specification and drawings for details thereof.

In a specific example, a predetermined area on an assembly line, that is, a trolley 4
A drive release means 16 shown in FIGS. 8 and 9 corresponds to a work area such as an assembly area or an adjustment area where the motor is temporarily stopped.
0 is placed. The illustrated drive release means 160 includes a release plate 164 extending in the direction of movement of the truck 4 as indicated by an arrow 162 (FIGS. 1 and 8) (see also FIG. 4). An inclined guide portion 166a and an inclined guide portion 166 are disposed adjacent to the Tomioka member 22 and extend upwardly in the direction indicated by the arrow 162.
a, and a blocking portion 166C extending substantially vertically upward at one end of the horizontal acting portion 166b, as shown by the two-dot chain line in FIG. The roller 90 mounted on the rotating body 44 moves through the inclined guide section 166a and the horizontal action section 166b. One end of the release plate 164 (the left end in FIGS. 8 and 9) is rotatably connected to the base 170 via a link member 168, and the other end (the right end in FIGS. 8 and 9) is rotatably connected to the base 170 via a link member 172.

That is, one ends of the link members 168 and 172 are rotatably connected via pins to brackets 174 and 176 attached to the lower surface of the release plate 164, and the other ends thereof are connected to brackets 174 and 176 attached to the upper surface of the base 170. 17
8 and 180 via a bottle. A cylinder mechanism 182 such as a pneumatic cylinder mechanism is further connected to one end of the release plate 164.

In a specific example, the cylinder body 184 of the cylinder mechanism 182
is rotatably connected to a support member 186 fixed to the base 170 via a pin, and its output rod 187 is connected to the bracket 18 attached to the lower surface of the release plate 164.
It is rotatably connected to 8 via a bottle. (Since the cylinder mechanism 182 is in the contracted state, the release plate 164 is positioned at the raised position shown in solid line in FIG. 8 (also shown in FIG. 9). In this raised position, The upper part of the inclined guide part 166a, the horizontal action part 166b, and the blocking part 166c of the release plate 164 protrude into the moving path of the rollers 90 of the truck 4. On the other hand, when the cylinder mechanism 1B2 expands, the link member 16
g and 172 are pivoted clockwise in FIG. 8, and the release plate 164 is positioned in the lowered position shown by the dashed-double line in FIG. In this lowered position, the entire release plate 164, that is, the inclined guide portion 166a, the horizontal acting portion 166b, and the blocking portion 166c, retreats downward from the movement path of the roller 90, and thus the release plate 164 acts on the roller 90. There isn't. In the specific example, as shown in FIG. 8, the link member 168 is connected to the other link member 17.
Therefore, in the raised position, the horizontal action portion 166b of the release plate 164
1 extends substantially horizontally, while in the lowered position, the horizontal acting portion 166b of the release plate 164 extends downwardly from one end to the other end, thereby causing the stop portion 1
66c is moved sufficiently downward, and the blocking portion 166c is reliably prevented from acting on the roller 90.

In the specific example, downward movement prevention means 6<
It is provided. The illustrated means for preventing downward movement is the base plate 170.
The bolt 190 is screwed into the release plate 164 and acts on the lower surface of the other end of the release plate 164.
Prevent the descent of 4. Note that by changing the height of the bolt 190, the lowering position of the release plate 164 can be adjusted.

Below this release plate 164 is a cylinder mechanism 18.
A switch means 192 is provided for extending 2. The illustrated switch means 192 switches a switching valve for supplying pressure fluid such as compressed air to the cylinder mechanism 182 when activated, thereby causing the cylinder mechanism 1
82 is expanded. This switch means 192
It is installed on 70. Moreover, this switch means 1
In conjunction with 92, an actuating member 196 is arranged. A pair of support members 198 and 200 are provided at both ends of the base 1700.
is installed. On the other hand, mounting blocks 202 and 204 are fixed to the upper ends of both ends of the operating member 196, and these mounting blocks 202 and 204 are rotatably attached to support members 198 and 200 via short shafts. Therefore, as shown in FIG. 9, the operating member 196 is in the non-acting position shown by the solid line around the short axis (in this non-acting position, the operating member 196 does not act on the detection portion 194 of the switch means 192). and the operating position shown by the two-dot chain line (in this operating position, the operating member 196 presses the detection portion 194 of the switch means 192 to bring it into the operating state). In the specific example, corresponding to the horizontal action portion 166b of the release plate 164 extending over a predetermined range, the action member 196 also extends from approximately one end of the release plate 164 to approximately the other end, Therefore, the rollers 90
A transmission lever, which will be described later, acts on the action member 196 no matter where it is located in b.

As shown in FIG. 10, the trolley 4 includes an operating member 206 for turning the operating member 196 toward the operating position.
A front auxiliary frame 210 that protrudes forward is provided at the front end of the O-truck body 6 where the transmission means 208 is provided. The front auxiliary frame 210 has walls 212 and 214 arranged at intervals in the front-rear direction, and these walls 21
2 and 214 are connected by a wall 216 (connecting one end of the walls 212 and 214) and connecting members 218 and 220, and one wall 214 is fixed to the front surface of the truck body 6. The operating member 206 is disposed at the other end of the walls 212 and 214, and is attached to the mounting portions 2 provided at both ends of the operating portion 222.
24 is pivotally connected to the walls 212 and 214 via a shaft member 226. This operating member 206 is arranged at the bottom of the right front end of the truck body 6, and the operator steps on the operating section 222 with his/her foot. Incidentally, it is also possible to arrange the operating member in the operating unit 14, for example, so that the operator manually operates the operating member.

Further, the transmission means 208 is composed of a transmission wire 227 and a transmission lever 228. A protruding piece 230 is fixed to the outer surface of the wall 216 of the front auxiliary frame 210, and a transmission lever 228 is rotatably attached to the protruding piece 230 via a pin 232.

One end of the transmission lever 228 projects outwardly through an opening formed in the wall 216;

The actuating member 196 is adapted to act on it. A coil spring 231 is installed between one end of the transmission lever 228 and a screw shaft 229 screwed onto the connecting member 218. The coil spring 231 biases the transmission lever 228 counterclockwise in FIG.
Hold in the position shown. The transmission wire 227 is made of a metal wire covered with a holding tube, and one end of the metal wire is connected to the operating member 206 (specifically, the connecting member 233 attached to one of the mounting parts 224), and the other end is connected to the transmission wire 227. Front auxiliary frame 21 at lever 228
It is connected to the other end located within 0. With this structure, when the operating portion 222 of the operating member 206 is stepped on with the foot, the transmission lever 228 is rotated outward as shown by the arrow 234 via the transmission wire 227 against the biasing action of the coil spring 231. It acts on the working member 196 which is in the non-working position. In the specific example, the transmission wire 227 is appropriately fixed to the connecting members 21B and 220 by an attachment band (not shown).

The truck 4 is further provided with a collision prevention device as shown in FIGS. 10, 11, and 12. The illustrated collision prevention device is a bumper member 2 provided at the front end of the truck body 6.
It is equipped with 40. The bumper member 240 is comprised of a rod-shaped member, extends over substantially the entire width of the truck body 6, and is preferably covered with an elastic member such as a rubber member to cushion the impact upon contact. This bumper member 24
0 is mounted so as to be movable in the front and rear directions of the truck body 6 (up and down in FIG. 10, and left and right in FIGS. 11 and 12), and the relative movement of this bumper member 240 causes rotation via a transmission mechanism 242. The signal is transmitted to the body 44. That is, in the specific example, connecting members 218 and 220
A pair of support brackets 244 and 246 are provided on the upper surface at intervals in the front-rear direction, and a first shaft 248 is rotatably supported between the front support brackets 244 and 246 via a bearing member. In addition, the second shaft 25 is connected via a bearing member between the rear support brackets 244 and 246.
0 is rotatably supported.

One end of the first shaft 248 and the second shaft 250 (the right end in FIG. 10) protrudes through the support bracket 246, and link members 252 and 254 are attached to these projecting ends.
One end is rotatably attached. In addition, the intermediate portion of the first shaft 248 and the second shaft 250 (support bracket 2
44 and 246), one end portions of link members 256 and 258 are also rotatably attached. On the other hand, a pair of connecting rods 260 and 262 are fixed to the bumper member 240 at intervals in the longitudinal direction, and these connecting rods 260 and 262 extend rearward. One of the connecting rods 260 is disposed corresponding to the link members 252 and 254, and is rotatably connected to the other ends of these link members 252 and 254 via a pin (these other ends have recesses). is defined, and the connecting rod 260 is located within the recess.) Also, the other connecting rod 26
2 is arranged corresponding to the link members 256 and 258,
The link members 256 and 258 are rotatably connected to the other ends of the link members 256 and 258 via pins (recesses are also defined at these other ends, and the connecting rod 262 is located within the recesses). In connection with the connecting lofts 260 and 262,
Loft stop means 264 are provided. Loft stop means 264 comprises block pieces 266 and 268 secured to the inner surface of wall 212 in correspondence with connecting rods 260 and 262.
and a stop screw 27 on each block piece 266 and 268.
0 (only the stop screw 270 screwed into the block piece 266 is shown in FIG. 11). In the specific example, a pin member 272 is fixed to the other end of the link member 258, and a block piece 27 fixed to the inner surface of the wall 212
A screw shaft 276 is screwed onto the pin member 272, and a coil spring 278 is installed between the pin member 272 and the screw shaft 276. The coil spring 278 biases the link members 256 and 258 (and 252 and 254) clockwise in FIGS. 11 and 12, or in other words biases the bumper member 240 forward.

So configured, the bumper member 240 is normally biased forward by the action of the coil spring 278 and the connecting rods 260 and 262 abut the head of the stop screw 270 as shown in FIG. 10 and FIG. It is held at the protruding position shown by the solid line in FIG. On the other hand, when an obstacle (for example, another truck 4, etc.) hits the bumper member 240, the bumper member 240 is moved rearward, and the link members 252, 254, 256 and 25
8 is pivoted counterclockwise in FIG. 11, movement beyond the position shown in FIG. 212 is prevented. While the bumper member 240 moves from the protruding position to the position shown in FIG.
and 262 move somewhat upward and then downward, thus allowing the movement described above. Note that the position of the bumper member 240 can be adjusted by rotating the stop screw 270.

In particular embodiments, one end of the first shaft 248 passes through the support bracket 244 and the actuating lever 28 is attached to such a protrusion.
2 is fixed. A roller 284 is rotatably attached to the tip of the action lever 282 via a pin, and this roller 284 acts from below on a part of the revolving body 44, specifically, a part 286 shown by a two-dot chain line in FIG. I'm starting to get it.

When the bumper member 240 is in the protruding position, the rollers 284 are located below the rotating body 44 in the connecting position and do not act on the rotating body 44, but the bumper member 240
When the lever 282 moves backward as indicated by the arrow 280, it acts on the portion 286 of the rotating body 44 as the operating lever 282 moves upward, causing the rotating body 44 to pivot toward the release position.

The truck 4 is provided with a brake means indicated by the number 288. The brake means 288 shown in the figure is a leaf spring member 292 rotatably attached to a support member 290 fixed to the inner surface of the wall 212 via a pin. A brake member 294, which can be made of urethane rubber, for example, is disposed on the lower surface of the distal end of the temporary spring member 292. Further, a mounting plate 296 is fixed to the connecting member 220, and an adjustment screw 298 extending downward toward the leaf spring member 292 is screwed onto the mounting plate 296.

A biasing spring (not shown) is also provided for biasing leaf spring member 292 upwardly in a clockwise direction in FIG. Further, a pressing member 300 that can act on the leaf spring member 292 is fixed to an intermediate portion of the second shaft 250 (specifically, a portion above the leaf spring member 292).
A roller 302 is rotatably attached to the tip of the roller 0 via a pin. With this structure, the bumper member 2
40 is in the protruding position, the rollers 302 of the pressing member 300 are located above the temporary spring member 292 and do not act on the temporary spring member 292. In this state, the leaf spring member 292 is biased upward by the action of a biasing spring (not shown), and a portion of the leaf spring member 292 comes into contact with the lower end of the adjustment screw 298, thereby being held in the non-braking state shown in FIG. Ru. In this non-braking state, the brake member 294 is located above the floor and does not substantially act (the movement of the truck 4 is allowed. On the other hand, the bumper member 294
0 is moved backward as indicated by the arrow 280, the pressing member 3
00 rollers 302 act on the upper surface of the leaf spring member 292,
As the bumper member 240 moves, the leaf spring member 292 moves downward. When the bumper member 240 is moved to the position shown in FIG. 12, for example, the leaf spring member 292 is moved to the first
The braking state shown in FIG. 2 is maintained. In such a braking state, the brake member 294 acts on the floor F through an opening (not shown) formed in the support plate 100 (FIG. 12), thus ensuring movement of the truck 4 by the action of the brake means 288. thwarted.

Referring to FIG. 1, in relation to the bumper member 240,
It is preferable to provide a bogie spacing setting member 304 at the rear end of the bogie 4. This bogie spacing setting member 304 can be constituted by a rod-shaped member, and is attached to the rear end of the bogie body 6 so that the protrusion 1 can be freely adjusted.

The truck spacing setting member 304 is the bumper member 2 of the following truck 4.
By adjusting the amount of protrusion, the distance between the carts 4 can be maintained at a predetermined value.

It is preferable that the above-mentioned truck 4 is provided with a release position locking means 306 as shown in FIG. 13, for example. The illustrated release position locking means 306 has a pedestal 308 fixed on the support plate 100, and a lock plate 310 is provided between the upper end of the pedestal 308 and the upper surface of the support plate 10o.

The lock plate 310 has an upwardly inclined sloped part 312 and a lock horizontal part 314 that is provided at the upper end of the sloped part 312 and extends substantially horizontally, and has an upwardly protruding abutting part 316 at one end of the lock horizontal part 314. It is provided. Also,
A bracket piece 318 is provided on the main body plate 48 on the lower side of the revolving body 44, and an arm 320 is rotatably connected to this bracket piece 318. A roller 324 is rotatably attached to the tip of the arm 320 via a pin 322, and this roller 324 moves on the lock plate 310 from the position shown by the two points MvA in FIG. 13 to the lock position shown by the solid line. is configured to do so. The arm 320 is also provided with a spring member (not shown) that biases the arm 320 counterclockwise in FIG. 13. An operating piece 326 (FIG. 10) is provided at the other end of the transmission lever 228 so as to act on the arm 320 of the release position locking means 306. This action piece 326 is connected to the arm 320 in the lock position when the transmission lever 228 is rotated in the direction shown by the arrow 234.
328 (FIG. 13), i.e., clockwise in FIG. 13. With this structure, when the revolving body 44 is in the above-mentioned connected position (shown by the two-dot chain line in FIG. To position. In addition, the revolving body 44 is moved beyond the release position to the release position (the position shown by the solid line in FIG. 13).
When the arm 32 is rotated in the direction shown by the arrow 92 until
0 extends approximately vertically, and the roller 324 is connected to the lock plate 310.
The rollers 324 are located in the lock horizontal part 314 of the contact part 3.
16 reliably prevents movement beyond the locking horizontal portion 314), thus the release position locking means 306 is in the locked state. In this locked state, the roller 324 is held in the horizontal part 314 by the action of the spring member (not shown), and the rotating body 44 is rotated toward the detached position (that is, in the opposite direction to the direction indicated by the arrow 92). rotational movement in the direction) is prevented. Note that when the rotating body 44 is at a position other than the above-mentioned detachment position (for example, at a release position, etc.), the rollers 324 move against the inclined portion 3 of the lock plate 310.
12, thus the release position locking means 306 is in the unlocked state.

Referring mainly to FIGS. 1, 4, 5, 8, 10, and 11, in order to move the trolley 4 along the assembly line, as shown in FIG. The rotating body 44 attached to the main body 6 is brought to the above-mentioned connection position, and the second member 124 of the guided means 118 is brought to the above-mentioned operating position.

In addition, the power feeding means 142 and the current collecting means 1 provided on the trolley 4
44 is electrically connected. In this way, the engaging pawl 3 provided on the drive chain 24 moving in the direction shown by the arrow 36
4 (any one of the plurality of engaging claws 34) comes into contact with the connecting pin 68, and the engaging claw 34 and the connecting pin 68 are drivingly connected, and thus the truck 4 is driven by the drive chain 24 moving in the direction shown by the arrow 36. It is moved in the direction indicated by the arrow 162 by the pushing action (see also FIG. 6). During such movement,
At the front part of the bogie body 6, the guided roller 66 is guided as required by the roller guide parts 20b and 22b of the guide means 2 (Fig. 6), and at the rear part of the bogie body 6, the guided roller 66 is guided as required by the roller guide parts 20b and 22b of the guide means 2. The guided rollers 136 attached to the member 124 are guided by the roller guide portions 20b and 22b of the guide means 2 as required, and the truck 4 is thus guided by the pair of guided rollers 66 and 136.
It is reliably guided along the guide means 2 by the action of .

When the trolley 4 is moved as described above to the work area (in other words, the area where the release play 164 is installed), the rollers 90 provided on the revolving body 44 of the trolley 4 are in the raised position. It comes into contact with the upper surface of the plate 164 and is moved upward along its inclined guide portion 166a. In this way, the rotating body 44 moves upward in the direction of the arrow 92 with the shaft member 56 as the center.
(FIG. 5), and when the roller 90 moves to the horizontal action portion 166b of the release plate 164, this rotating body 44 is held at the release position shown by the two-dot chain line in FIG. be done. When positioned at this release position, the connecting pin 68 (FIG. 6) provided on the revolving body 44 is located above the movement path of the engaging pawl 34 of the drive chain 24, and thus the connection pin 68 and the driving chain 24 are The drive connection is released and the movement of the truck 4 is stopped. Note that even when the driving connection between the engaging claw 34 and the connecting pin 68 is released, the trolley 4 does not suddenly stop, but moves somewhat due to its inertia and then stops, so that the roller 90 acts horizontally. The truck 4 comes to stop at a point located approximately at the center or the tip of the portion 166b in the longitudinal direction. When the roller 90 moves to the tip of the horizontal action part 166b, it comes into contact with the blocking part 166c, and therefore, the roller 90 is prevented from moving beyond the blocking part 166c, and thus the trolley 4 can move beyond the working area without temporarily stopping. There isn't. As shown above,
When the trolley 4 moves to the work area, the driving connection between the connecting pin 68 and the engagement pawl 34 of the drive chain 24 is released by the action of the release plate 164 of the drive release means 160, and the trolley 4 is stopped in the work area as required. be done.

To remove the truck 4 from the assembly line, move the revolving body 44 to the arrow 9
2 (FIGS. 5 and 13) to bring it to the detached position, and the second member 124 of the guided means 118 is also pivoted in the direction indicated by arrow 140 (FIG. 7) to bring it to the detached position. It suffices if it is placed in the position (indicated by the two-dot chain line in FIG. 7). When the revolving body 44 is swiveled to the detached position, the rollers 324 are moved along the sloped portion 312 of the lock plate 310 to the lock horizontal portion 314, as shown in FIG. The revolving body 44 is releasably locked in the detached position. When placed in such a detached position, the guided roller 66 and the connecting pin 68 mounted on the revolving body 44
is removed from the guide groove of the guide means 2. Further, when the second member 124 is placed in the upper detached position, the second member 124
The guided roller 136 mounted on the guide means 2 is also removed from the guide groove of the guide means 2. Thus, the trolley 4 can be removed from the assembly line and moved freely.

In order to move the cart 4 that has been removed from the assembly line along the line again as described above, the cart 4 is positioned close to the guide means 2, and then the second member 124 is moved from the detached position to the above-mentioned position. Rotate it to the operating position and operate it by stepping on the operating part 222 of the operating member 206 with your foot (10th
figure). In this way, the movement of the operating member 206 is transmitted to the transmission lever 228 via the transmission wire 227, and the transmission lever 228 is rotated in the direction shown by the arrow 234. In this way, as the transmission lever 228 rotates, the action piece 32
6 acts on the arm 320 in the locked state to cause the first
3, the roller 324 moves from the locking horizontal portion 314 to the inclined portion 312, and thus the locking state of the release position locking means 306 is released. When the locked state is released, the rotating body 44 swings downward by its own weight and is positioned from the disengaged position to the disengaged position to the connected position.

In order to move the trolley 4 that has been stopped in the work area as described above, it is sufficient to step on the operating section 222 of the operating member 206 (FIG. 10). In this way, as described above, the movement of the operating member 206 is transmitted to the transmission lever 228 via the transmission wire 227, and the transmission lever 228 is turned in the direction shown by the arrow 234 (note that at this time, the release position lock is not activated). The means 306 are not held in a locked state, so that the actuating piece 326 does not act on the arm 320 with a pivoting movement of the transmission lever 228). In this way, one end of this transmission lever 228 is connected to the operating member 19.
6 to pivot the working member 196 from the non-working position (the position shown in FIG. 8 and the solid line in FIG. 9) to the working position (the position shown by the two-dot chain line in FIG. 9);
This causes the switch means 192 to be activated. In this way, the extension side (cylinder side) of the cylinder mechanism 182
A pressurized fluid such as compressed air is supplied to the cylinder mechanism 182, thereby expanding the cylinder mechanism 182. Cylinder mechanism 18
2 is extended, link members 168 and 172 are pivoted clockwise in FIG.
is moved from the raised position (the position shown by the solid line in FIG. 8) to the lowered position (the position shown by the two-dot chain line in FIG. 8), and this release play 164 is separated from the roller 90 of the rotating body 44. Accordingly, the rotating body 44 is positioned from the above-mentioned release position to the above-mentioned connection position. Thus, the engagement pawl 34 of the drive chain 24 moving in the direction shown by the arrow 36 comes into contact with the connecting pin 68, thereby drivingly connecting the two, and the truck 4 is moved together with the drive chain 24. Note that when the truck 4 moves a predetermined distance, the cylinder mechanism 182 is contracted. The link members 168 and 172 are then pivoted counterclockwise in FIG. 8, and the release plate 164 is positioned in the above-mentioned raised position, so that the following truck 4 can be moved as described above by the action of the release plate 164 in the raised position. and will be stopped.

When the cart 4 moving along the assembly line hits an obstacle such as the cart spacing setting member 304 (Fig. 1) of the preceding cart 4 or the part 2 worker, the movement of the cart 4 is stopped as follows. be done. That is, when the front end of the truck 4, and therefore the bumper member 240, hits an obstacle, the bumper member 240 moves backward as indicated by the arrow 280 (FIG. 11) relative to the truck body 6 as the truck 4 moves. be done. Thus, as can be seen from FIGS. 10 to 12, the relative movement of the bumper member 240 causes the link members 252, 2
54, 256 and 258 are pivoted counterclockwise in FIG.
and rotate as required. The first axis 248 is the first
When rotated as shown in FIG. 2, the roller 284 at the tip of the operating lever 282 provided at the other end acts on the section 286 (FIG. 4) of the rotating body 44, causing the arrow 92 (FIG. 5) to move.
The rotating body 44 is brought to the above-mentioned release position by turning in the direction shown by. In this way, as mentioned above, the connecting pin 6
8 and the engagement pawl 34 of the drive chain 24 is released, and the above-mentioned movement of the truck 4 is stopped. Also, the second
When the shaft 250 is rotated as shown in FIG. 12, the roller 302 at the tip of the pressing member 300 provided at the intermediate portion
acts on the leaf spring member 292 to cause it to pivot downward, and the leaf spring member 292 is held in the braking state shown in FIG. When thus maintained in the braking state, the brake member 294
acts on the floor through an opening (not shown) formed in the support plate 100, and the truck body 6 is suddenly stopped by the braking action of the brake member 294 and held at the stopped position. As described above, when the moving truck 4 hits an obstacle, the driving connection between the truck main body 6 and the drive chain 24 is released, and the movement of the truck 54 is stopped, thus preventing the truck 4 from hitting the obstacle. Collisions are prevented and adverse effects caused by impacts and the like are avoided.

Bumper member 240 of the obstacle, such as by removing the obstacle.
When the action of the coil spring 278 is released, the bumper member 240 is positioned in the protruding position shown in solid line in FIG. 11 by the action of the coil spring 278. (Then, due to the rotation of the first shaft 248, the roller 284 at the tip of the operating lever 282 is separated below the rotating body 44, and the rotating body 44 is positioned at the above-mentioned connection position by its own weight, and the connecting bin 68 and the drive The engagement pawl 34 of the chain 24 is driven and connected.The rotation of the second shaft 250 also causes the roller 3 at the tip of the pressing member 300 to
02 is spaced above the leaf spring member 292, and the leaf spring member 2
92 is held in the non-braking state by the action of a biasing spring (not shown), and the brake member 294 does not act on the floor. Thus, the movement of the trolley 4 is resumed, and the trolley 4
are moved as required along the assembly line.

Although an example of a collision prevention device configured according to the present invention has been described above, the present invention is not limited to such a specific example, and various modifications and changes can be made without departing from the scope of the present invention. be.

For example, in the specific example shown, the movement of the bumper member is transmitted to the shaft member via a link mechanism, but it is transmitted to the shaft member via another known mechanism, such as a mechanism consisting of a combination of a rack and a pinion. You may also do so.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a part of an assembly line to which a specific example of the collision prevention device according to the present invention is applied. 2 is an enlarged front view of a portion of the drive chain on the assembly line of FIG. 1; FIG. FIG. 3 is an enlarged plan view of a portion of the drive chain of FIG. 2; FIG. 4 is a plan view showing the connection between the drive chain and the truck in the assembly line of FIG. 1; FIG. 5 is a sectional view taken along line v-v in FIG. 4. 6 is a side view of the connection between the drive chain and the truck shown in FIG. 4; FIG. FIG. 7 is a sectional view showing guided means provided on the cart of FIG. 1 and the vicinity thereof. FIG. 8 is a front view showing the drive release means disposed in the work area. FIG. 9 is a plan view of the drive release means shown in FIG. 8. FIG. 10 is a sectional view showing the front end of the truck. FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10. FIG. 12 is a sectional view corresponding to FIG. 11, showing a state when an obstacle acts on the bumper member. FIG. 13 is a sectional view showing the detachment position locking means provided on the cart of FIG. 1 and the vicinity thereof. 2... Guide means 4... Cart 6... Cart body 24... Drive chain 34... Engaging claw 44... Swivel bodies 66 and 136... Guided roller 68... Connection Bins 72 and 74...Buffer means 90...Roller 118...Guided means 160...Drive release means 164...Release plate 182...Cylinder mechanism 192...Sinch means 196... Acting member 206... Operating member 208... Transmission means 240... Bumper member 242... Transmission mechanism 252, 254, 256 and 258... Su282...
・Action lever 288...brake means>grip member 300...pressing member 306...release position locking means

Claims (1)

[Claims] 1. A collision prevention device for a truck that is moved by the action of a drive transmission member that is moved in a predetermined direction and a coupling member that is provided on the truck body and is releasably connected to the drive transmission member. The bumper member is relatively movably attached to the front end of the truck body, and a transmission mechanism that transmits relative movement of the bumper member to the connecting member, the bumper member being attached to the truck body. When the bumper member is moved relative to the other member, the movement of the bumper member is transmitted to the coupling member via the transmission mechanism, thereby releasing the driving connection between the coupling member and the drive transmission member. Collision prevention device. 2. The connecting member is provided on a revolving body attached to the truck body, and the revolving body moves between a connecting position where the connecting member and the drive transmission member are drivingly connected and a release position where the driving connection between the two is released. When the bumper member is moved relative to the truck body, the movement of the bumper member is transmitted to the rotating body via the transmission mechanism, and thus the rotating body is moved to the connected position. The anti-collision device according to claim 1, wherein the anti-collision device is pivoted from the released position to the released position. 3. The collision prevention device according to claim 1 or 2, wherein the truck body is further provided with a braking means that is brought into a braking state when the bumper member is moved relative to the truck body.