JPH065340Y2 - Self-weight open / close type suspension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a self-weight open / close type suspension device, and more particularly to a self-weight open / close type suspension device having a simplified structure and improved durability.

(Prior art) When a concrete block is carried to a construction site, for example, a seawall construction site, a waterway construction site, or a residential land development site, manually carrying the block causes a great burden on the worker and a long working time. Therefore, a pantograph-shaped or X-shaped link is configured and a block holding portion is formed at the lower end of the link, and the link is opened and closed according to the lever principle to hold the block, which is then used by a crane or forklift. Various suspending devices have been developed that can be hung up and transported for transportation.In this case, if the block is manually clamped and released by the worker, the burden on the worker can be sufficiently reduced. There is a problem that it does not exist.

Therefore, in the conventional suspension device of this type, a protrusion is fixed to one arm that constitutes a pantograph-like link, and a latch body is swingably provided on the other arm, and the protrusion is locked and guided to the latch body. Forming a groove and holding the pantograph-shaped link in the open state by engaging the latch with the protrusion, the link itself disengages the latch from the protrusion, and the protrusion is placed in the groove of the latch. A method in which the pantograph-shaped link can be opened and closed by moving the guide (see Japanese Patent Publication No. 49-35375), and the upper and lower pivot points of a pair of pantograph-shaped links are connected to each other by the horizontal axis, and the lower lateral The upper part of the hollow shaft fixed to the shaft is slidably inserted into the upper horizontal shaft, and the rod is raised by its own weight,
The rod causes the cam in the hollow shaft to swing and project from the opening hole of the shaft to lock the upper horizontal shaft, thereby holding the pantograph-like link in an open state, and lowering the rod swings the cam to the opening hole. A method that allows the pantograph-shaped link to be opened and closed by being immersed (Jitsuko Sho 63-4).
6461 gazette), etc. are adopted.

(Problems to be Solved by the Invention) However, in the device described in the above-mentioned conventional publication, since the projection is engaged and guided by the groove of the latch body, it is necessary to manufacture the groove of the latch body with high accuracy. There was a problem.

Further, in the device described in the above-mentioned conventional publication, the cam is provided in the shaft so that the cam is swung in the shaft to be retracted from the opening hole. Therefore, after the rod is lowered, it is necessary to retract the cam by the upper horizontal axis. As a result, a load is easily applied to the peripheral edge of the opening hole and the opening hole is easily deformed, and the number of parts increases, resulting in high cost.Furthermore, the cam is retracted after the rod is lowered to unlock the lock. It is necessary to move the upper horizontal axis up and down by a predetermined amount. as a result,
The operation is performed in two stages, the operator's operation becomes complicated, and the operation requires skill, and the block is often suspended.If it is suspended, the device is temporarily lifted due to the structure of the device. There was a problem that we had to return to the initial state. Further, since the cam mechanism is built in the hollow shaft and the horizontal shaft, the lock releasing operation cannot be seen from the outside, and it is necessary to perform the operation by the operator's feeling.

In view of such conventional problems, an object of the present invention is to provide a universal open / close type suspension device which does not require so high processing accuracy, has a simple structure, is inexpensive, and is easy to operate.

(Means for Solving the Problem) Therefore, in the freely opening / closing suspension device according to the present invention, the ends of a pair of upper and lower arms are rotatably connected to each other, and the upper end of both upper arms and both Suspension in which a substantially central portion of the lower arm is mutually supported by a rotary shaft to form a pantograph-like link, and a work gripping portion for clamping or pressing a work is formed at the lower end portions of both lower arms. In the device, a support pin is provided on the upper rotary shaft and a guide pin is provided on the lower rotary shaft, while the horizontal portion of the guide plate having a substantially inverted L-shape consisting of a horizontal portion and a vertical portion has a substantially horizontal direction. The elongated hole extending to the above is formed, the supporting pin is accommodated in the elongated hole, the guide plate is swingably supported by the pin, and the lower end portion of the vertical portion has a locking portion for locking the guide pin. , A protrusion that can be slidably contacted with the guide pin is formed above it A support pin on the first rocking fulcrum position of the vertical side of the slot,
The distance l1 between the guide pin locked to the locking portion and the distance l2 between the protrusion and the guide pin slidingly contacted is l1> l2.
A distance l3 between the support pin at the second swing fulcrum position on the other end of the long hole and the guide pin locked by the locking portion,
Set the distance l4 between the protrusion and the guide pin in sliding contact to l4>
The gist is to set it to l3.

The work to be hung here is not limited to the concrete block, but may be another article such as a plate product or a fume pipe. Further, the present invention is not limited to the case where the work is clamped from the outside, but can be applied to the case where the work is pressed and grasped from the inside like a U-shaped block.

Further, the pantograph-like link may be configured by connecting a plurality of these to each other.

Further, when the shapes of the long holes and the protrusions of the guide plate are set, the protrusions may be formed in a triangular shape or a concave portion may be formed in the middle, and the support pin may be the first swing fulcrum as shown in the following embodiments. When the guide pin moves from the position to the second swing fulcrum position so that the guide pin falls from the apex along the hypotenuse or into the recess, a more reliable operation is possible.

If a wire or rod that restricts the movement of both arms is provided between the upper arm and the lower arm, the above operation can be performed more reliably.

(Operation) In the present invention, before gripping the workpiece, the support pin is positioned at the first swing fulcrum position on the vertical portion side of the elongated hole of the guide plate in a predetermined contracted state of the pantograph-shaped link, and the guide pin is guided. The pantograph-shaped link is held in the predetermined contracted state by being locked to the locking portion of the plate, and the work gripping portion is held in the open state.

When grasping and suspending a work, the pantograph-shaped link is lowered, its lower arm is brought into contact with the work, and when the link is further lowered, the pantograph-shaped link contracts due to its own weight. Then, the upper arm swings down with respect to the lower arm, and when this is in a predetermined state, the distance between the support pin and the guide pin becomes smaller than the distance between the first swing fulcrum position of the guide groove of the guide plate and the locking portion. Since it becomes smaller, the locking between the guide pin and the locking part is released, and when the upper arm swings down with respect to the lower arm, the guide pin is locked while slidingly contacting the outer peripheral surface of the protrusion of the guide plate. When the support pin is moved in a direction away from the portion and moves a predetermined distance, the support pin slides in the elongated hole of the guide plate from the first swing fulcrum position to the second swing fulcrum position on the other end side, and the guide plate moves to the center of gravity position. Swings due to changes in
As a result, the engagement between the guide pin and the engaging portion of the guide plate is prevented, the pantograph-shaped link can be expanded and contracted, and the workpiece gripping portion can also be opened and closed. In principle, the work gripping portion holds or presses the work to suspend the work.

Also, when placing a work, if the pantograph-shaped link with the work suspended as described above is lowered at the target position as it is, the work is first grounded, and further lowered, the pantograph-shaped link is suspended. Is released, and the pantograph-like link contracts from its extended state by its own weight. Then, first, when the pantograph-like link contracts, the work gripping part opens according to the lever principle to release the work and the work is placed, and when the pantograph-like link further contracts to a predetermined contracted state, the guide is released. When the pin comes into contact with the outer peripheral surface of the protrusion of the guide plate, this time the support pin slides back through the elongated hole of the guide plate from the second swing fulcrum position to the first swing fulcrum position, and when the link contracts, the guide pin Slides back on the outer peripheral surface of the protrusion of the guide plate in the direction of the locking portion and is locked to the locking portion, thus returning to the original state.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show a self-weight open / close type suspension device according to an embodiment of the present invention, which is an example applied to a block suspension device. In the figure, 1 is a pantograph-shaped link, and the link 1 is a pair of upper and lower arms 10 and 11 respectively.
Are rotatably connected to each other, and the upper ends of the upper arms 10 and the substantially central portions of the lower arms 11 are rotatably supported by rotating shafts 12 and 13, respectively. Hook parts (work gripping parts) 14 for sandwiching the concrete block (work) 2 are formed at the lower ends of both lower arms 11.

In addition, the front and rear pantograph-shaped links 1 are connected to each other between the upper and lower rotary shafts 12 and 13 by upper and lower horizontal rods 15 and 16, and opposite ends for hanging with a crane or the like at both ends of the upper horizontal rod 15. A U-shaped hook 17 is fixed, and an abutment plate 18 abutting the block 2 is provided in the approximate center of the lower horizontal rod 16.
Are fixed to each other, and a plurality of blocks 2 are provided between the hook portions 14.
The pipes 19 are connected to each other so that they can be suspended.

A support pin 3 is planted outward on the upper rotary shaft 12 of one of the pantograph-shaped links 1, a retaining plate 31 is fixed to the tip of the support pin 3, and the lower rotary shaft 13 is attached. A guide pin 4 is planted in this.

A guide plate 5 is swingably supported on the support pin 3. This guide plate 5 has a horizontal portion 50.
And a vertical portion 51 are formed in a substantially inverted L shape, and the horizontal portion 50 is formed with a long hole 52 extending in a substantially horizontal direction and having a vertical portion 51 side end portion bent upward. The support pin 3 is accommodated in the hole 52, and thus the guide plate 5 is swingably supported by the support pin 3, and the end of the elongated hole 52 on the side of the vertical portion 51 is located at the first side of the guide plate 5. The first swing fulcrum position 53 and the other end side end portion are the second swing fulcrum position 54.

Further, the vertical portion 51 of the guide plate 5 is formed with a locking portion 55 for locking the guide pin 4 at a lower end portion thereof, and an upper side of the locking portion 55 is slidably contacted with the guide pin 4 to be described above. Triangular protrusions 56 for sliding the support pins 3 in the elongated holes 52 are formed.

Here, as shown in FIG. 6, the distance l1 between the support pin 3 at the first swing fulcrum position 53 and the guide pin 4 locked by the locking portion 55, the projection 56, The distance l2 between the guide pins 4 in sliding contact is set to l1> l2,
A distance l3 between the support pin 3 at the second swing fulcrum position 54 and the guide pin 4 locked by the locking part 55, and a distance l4 between the guide pin 4 slidably contacting the protrusion 56. Is l4
> 13 is set.

Next, the operation will be described.

Before the block 2 is suspended, as shown in FIG. 3, the pantograph-shaped link 1 is folded into a predetermined contracted state, and the support pin 3 is located on the vertical portion side of the elongated hole 52 of the guide plate 5. It is located at the first swing fulcrum position 53, and the guide pin 4 is locked by the locking portion 55 of the guide plate 5, so that the pantograph-shaped link 1 is held in the predetermined contracted state and the hook portion 14 is opened. Held in.

On the other hand, when the block 2 is sandwiched and suspended, the wire 6 extending from the crane or the forklift is locked to the hooks 17 at both ends of the upper horizontal rod 15 in the above-described state to suspend the device, and the device is suspended in two blocks. After carrying it to directly above, lower it. Then, as the apparatus descends, the contact plate 18 of the lower horizontal rod 16 first contacts the upper surface of the block 2, and the pantograph-shaped link 1 is released from the suspension of a crane or the like and begins to contract due to its own weight. Then, the upper arm 10 swings down with respect to the lower arm 11, and when this is in a predetermined state, the distance between the support pin 3 and the guide pin 4 becomes the first swing fulcrum of the elongated hole 52 of the guide plate 5. It becomes smaller than the distance between the position 53 and the locking portion 55, and the locking between the guide pin 4 and the locking portion 55 is released.

When the upper arm 10 further swings down with respect to the lower arm 11, as shown in FIG. 4, the guide pin 4 moves away from the locking portion 55 while slidingly contacting the oblique side of the protrusion 56 of the guide plate 5. When it is moved to a predetermined distance and moved by a predetermined distance, the guide pin 4 will cross the top of the protrusion 55. Then, the guide plate 5 swings and falls by its own weight until the guide pin 4 comes into contact with the slanted side edge 57 of the protrusion 56, and the support pin 3 moves the elongated hole 52 of the guide plate 5 into the first hole 52.
The guide plate 5 slides from the swing fulcrum position 53 to the second swing fulcrum position 54 on the other end side, and the guide plate 5 swings in the direction of arrow A in FIG. 4 and the locking portion 55 of the guide plate 5 are separated from each other by the distance, and the pantograph-shaped link 1 can be expanded and contracted so that the hook portion 14 can be opened and closed. When the block 2 is lifted, the hook portion 14 holds and holds the block 2 by the principle of leverage, and when the block 2 is lifted as it is, the block 2 is lifted as shown in FIG.

In this way, when the block 2 is lifted up and carried to a desired place and placed, the pantograph-shaped link 1 is lowered at that position as it is. Then, first, when the block 2 is grounded and further lowered, the hoisting of the pantograph-like link 1 is released, and the pantograph-like link 1 begins to contract from the extended state due to its own weight. Then, first, with the contraction of the pantograph-shaped link 1, the hook portion 14 is opened by the leverage principle, and the block 2 is opened and placed. When the pantograph-shaped link 1 is further contracted to a predetermined contracted state, the guide pin 4 comes into contact with the hypotenuse 56 of the guide plate 5, and this time the guide plate 5 swings back around the guide pin 4 and is supported. When the pin 3 slides back in the elongated hole 52 of the guide plate 5 from the second swing fulcrum position 54 to the first swing fulcrum position 53, and the link 1 further contracts, the guide pin 4 causes the protrusion 56 of the guide plate 5 to move. The slanted side is slid back in the direction of the locking portion 55 to be locked by the locking portion 55, and thus returns to the initial state, after which the block 2 may be transported by performing the same operation as above.

Further, when the block 2 is lifted, the contact plate 18 collides violently with the block 2, the guide plate 5 makes one rotation, and the guide pin 4 makes the locking portion 55 at the lower end of the guide plate 5.
When it comes to the back side 41, if the device is hoisted in that state, the pantograph-shaped link 1 extends and the guide pin 4 disengages from the locking portion 55 at the lower end of the guide plate 5 and the guide plate 5 Swings around the second swing fulcrum position 54 and the initial engagement between the guide pin 4 and the locking portion 55 is released, so that the same operation may be performed again thereafter.

In the freely opening / closing suspension device of this embodiment as described above, the guide plate 5 is formed with the long hole 52, and the guide plate 5
Since the center of gravity is changed by swinging the fulcrum at two fulcrums 53 and 54, the prior art publication (Japanese Patent Publication No. 49-3537).
Even if the plate is not processed with high accuracy as in the device described in No. 5), the operation can be performed reliably, the manufacturing becomes easy, and the manufacturing cost can be reduced.

Further, in this suspension device, the guide plate 5 and the pins 3,
Since the opening / closing mechanism is configured by the combination with No. 4, the number of parts is small and the structure is simple as compared with the device disclosed in the conventional publication (Japanese Utility Model Publication No. 63-46461), and as a result, the risk of failure can be reduced. Therefore, cost reduction can be realized.

Further, in this suspension device, since the guide pin 4 is locked at the first swing fulcrum position 53 of the guide plate 5 and the guide pin 4 is blocked at the second swing fulcrum position 54, The locking, unlocking and blocking of the guide pin 4 are carried out very smoothly and continuously, and as a result, the block 2 can be hung by one operation, resulting in a hanging operation of the block 2. No skill is required, and even beginners can surely hang the block 2 without fail, and the hanging work time is significantly longer than that of the device described in the conventional publication (Jitsuko 63-46461). Can be shortened to In particular,
In this device, since the operation of the guide plate 5 can be confirmed from the outside, the block 2 can be seen while looking at the plate 5.
Can be suspended, and the reliability of operation can be improved.

Further, in this suspension device, since the hook portion 14 can be arbitrarily opened and closed after the lock of the hook portion 14 is unlocked, the size of the block 2 to be suspended is not limited, and as a result, it is possible to use only one device. It is possible to suspend the block 2 having an arbitrary size.

(Effect of the Invention) As described above, according to the present invention, in the hanging device in which the work gripping portion that clamps or presses the work is formed at the lower end portion of the pantograph-like link, the supporting pin, the guide pin, and the guide plate are provided. Since the work gripping part is locked / unlocked by the combination of, the dimensional accuracy is not so high and the structure can be simplified, the cost can be reduced and the durability can be improved. There is an effect that simplification and certainty can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a freely opening and closing type suspension device according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a guide plate in the device, and FIGS. 3 to 5 are operations of the device. FIG. 3 is a plan view showing a state before the suspending operation, FIG. 4 is a plan view showing a state during the suspending operation, and FIG. 5 is a state during the suspending operation. FIG. 6 is a plan view showing the dimensions of each part of the guide plate. 1 ... Pantograph-shaped link, 10, 11 ... Arm,
12, 13 ... Rotating shaft, 14 ... Hook part (work gripping part), 2 ... Block (work), 3 ... Support pin, 4
...... Guide pin, 5 ...... guide plate, 52 ...... long hole, 53 ...... first swing fulcrum position, 54 ...... second swing fulcrum position, 55 ...... locking part, 56 ...... projection part.

Claims (1)

[Scope of utility model registration request] 1. A pair of upper and lower arms 10 and 11 are rotatably connected to each other at their end portions, and the upper end portions of both upper arm portions 10 and the substantially central portions of both lower arm portions 11 are rotated relative to each other. A suspending device comprising a pantograph-shaped link 1 pivotally supported by shafts 12 and 13, and a work gripping portion 14 for sandwiching or pressing the work 2 at the lower end portions of the both lower arms 11. The upper rotary shaft 12 is provided with a support pin 3 and the lower rotary shaft 13 is provided with a guide pin 4, while the guide plate 4 has a substantially inverted L-shape including a horizontal portion 50 and a vertical portion 51. 5, the elongated hole 52 extending substantially in the horizontal direction is formed, and the supporting pin 3 is formed in the elongated hole 52.
, The guide plate 5 is swingably supported by the support pin 3, and a locking portion 55 for locking the guide pin 4 is provided at the lower end portion of the vertical portion 51, and the guide pin 4 is provided above it. A protrusion 56 that can be slidably contacted with is formed, the support pin 3 at the first swing fulcrum position 53 on the vertical portion 51 side of the elongated hole 52, and the guide pin 4 locked by the locking portion 55. And a distance l2 between the protrusion 56 and the guide pin 4 slidingly contacted with each other are set to l1> l2, and the second swing fulcrum position 54 is located on the other end side of the elongated hole 52. The support pin 3 and the guide pin 4 locked by the locking portion 55.
The guide pin 4 that slidably contacts the protrusion 56
The self-weight open / close suspension device is characterized in that a distance l4 between and is set to l4> l3.