JPH057214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a truck crane that is equipped with a chain block that is moved in the front and back direction near the top of the loading platform of the truck.

[Prior art]

Conventionally, as a truck crane,
A truck crane having a structure disclosed in Publication No. 20255 is known.

[Problem that the invention seeks to solve]

In the case of the conventional truck crane, when the front pole and rear pole are tilted backward, the guide rail faces backward and tilts downward, so that the front pole and rear pole have to be moved every time cargo is loaded or unloaded onto the truck. There is a problem in that a rotating operation must be performed.

[Purpose and structure of the invention]

The object of the present invention is to provide a truck crane that can advantageously solve the above-mentioned problems. The lower ends of the vertical frames 5 on both sides of the gate-shaped frame 4 are rotatably attached to the support fitting 3 by horizontal shafts 6 extending in the left-right direction. The rear end of the traveling frame 8 extending in the direction is rotatably connected to a front support fitting 9 fixed to the center of the front of the loading platform 2, and is slidably fitted to the lower support 16. The lower part of the front strut 10, which consists of an upper strut 17 and a strut length adjustment locking device 24, is mounted so that it can be fixed in an upright position and a backward tilted position, and the lower strut 16 and the upper strut 17 are retractable. They are connected via a support rod 38, and the upper end of the front strut 10 is pivotally connected to the front end of the traveling frame 8 by an upper support shaft 11 extending in the left-right direction.
A trolley 12 to which a chain block 13 is attached is movably attached to the traveling frame 8, which is configured to be substantially horizontal when the rear part thereof protrudes rearwardly than the loading platform 2. It is on a truck crane.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an embodiment of the present invention, in which a metal tube is bent to form a horizontal horizontal frame 7 extending in the left-right direction and a vertical frame 7 extending downward from both ends of the horizontal frame 7. A gate-shaped frame 4 is constructed of a frame 5, and rear support fittings 3 are fixed to both left and right sides of the rear part of the loading platform 2 in the truck 1 with bolts 14. , is pivotally connected to the rear support fitting 3 by a horizontal shaft 6 extending in the left-right direction, and furthermore, at the rear end portion of a traveling frame 8 made of a metal tube extending in the front-rear direction above the center of the width direction of the loading platform 2, left and right The central part of the support tube 15 extending in the direction is fixed, and the support tube 15 is
Before the portal frame 4 is bent and formed, it is rotatably fitted in advance to the horizontal frame 7.

An upper support 17 is slidably inserted into the lower support 16, and a holding fitting 1 is attached to the upper side of the lower support 16.
8 is fixed, a locking pin 19 is slidably inserted across the holding fitting 18 and the lower support 16, and the spring receiving flange 20 and the holding fitting 18 are fixed to the locking pin 19 within the holding fitting 18. A locking pin insertion spring 21 is interposed between the end plate and the upper support column 17, and a lower locking hole 22 and an upper locking hole 23 are provided in the upper support column 17.

The locking pin 19 is pulled against the force of the locking pin insertion spring 21 to insert the locking pin 19 into the lower locking hole 2 of the upper column 17.
When the upper support 17 is moved downward with the locking pin 19 pressed against the outer surface of the upper support 17, the upper locking hole 23 of the upper support 17 will align with the locking pin 19. When the locking pin 19 reaches the level where the locking pin insertion spring 2
1 and is automatically inserted into the upper locking hole 23, and the upper support column 17 is locked in the lowered position.

Further, the locking pin 19 is inserted into the locking pin insertion spring 2.
1, pull it out from the upper locking hole 23 of the upper support 17, and move the upper support 17 upward with the locking pin 19 pressed against the outer surface of the upper support 17. When the lower locking hole 22 of the upper support column 17 reaches a level where it matches the locking pin 19, the locking pin 19 is pressed by the locking pin insertion spring 21 and is automatically inserted into the lower locking hole 22. and the upper support column 17 is locked in the raised position.

A locking pin 19 that is inserted into the lower locking hole 22 and the upper locking hole 23, a locking pin insertion spring 21 that presses the locking pin 19, and the locking pin 19.
A support length adjustment lock device 24 is constituted by the holding metal fitting 18 that supports the locking pin insertion spring 21, and the lower support support 16 and the upper support support 1
7 and the strut length adjustment lock device 24 constitute a telescopically adjustable front strut 10.

The front support fitting 9, which includes a front stopper 25 and a rear stopper 26, is placed on the upper surface of the center in the left-right direction at the front end of the loading platform 2 and is fixed with a bolt 27, and is attached to the upper part of the front support fitting 9. The lower end portion of the lower support 16 in the front support 10 is pivoted by a support shaft 28 extending in the left-right direction, and a pin hole 29 is provided at the lower end of the lower support 16 in the front support 10, and the front support metal fitting 9 includes a front pin hole 30 that matches the pin hole 29 when the lower support column 16 comes into contact with the front stopper 25.
and a rear pin hole 30 that matches the pin hole 29 when the lower strut 16 is brought into contact with the rear stopper 26.
and is provided.

When the holding pin 32 is inserted between the pin hole 29 of the lower support 16 and the rear pin hole 31 of the front support fitting 9, the support 10 is held in an upright state, and the pin hole 29 of the lower support 16 and the front When the holding pin 32 is inserted across the front pin hole 30 of the support fitting 9, the front support column 10 is held in a tilted state in a direction in which it falls backward.

An upper strut 17 of the front strut 10 is attached to the diagonally downward bent end of the front end of the traveling frame 8.
The upper end portion is pivotally connected by an upper support shaft 11 extending in the left-right direction, and is connected to the traveling frame 8 and the upper support column 1.
7 is covered with a flexible cover 33 made of a rubber bellows tube, and the flexible cover 3
3 are fixed to the running frame 8 and the upper strut 17, and the wheels 34 of the trolley 12 are mounted on the running frame 8, and the wheels 34 of the trolley 12 are provided at the lower part of the frame 35 of the trolley 12. A hook 36 attached to the upper part of the main body of the chain block 13, which is operated by the power source of the truck, is removably locked in the locking hole.

A stopper 37 for restricting the forward movement of the trolley 12 is fixed to the side surface of the front end of the horizontal portion of the traveling frame 8, and a gas-filled gas stopper 37 is fixed to the front end of the horizontal portion of the traveling frame 8. They are connected via a retractable bearing rod 38, and the retractable bearing rod 38 exerts a supporting force approximately equal to the sum of the dead weight of the upper strut 17 and the load acting on the upper portion of the upper strut 17.

When loading cargo placed on the ground onto the loading platform 2 of the truck 1 using the truck crane configured as described above, first the front support 10 is extended as shown in FIG. Lower column in condition 1
6 and the upper strut 17, and with the portal frame 4 and the front strut 10 tilted so that their upper parts fall backward, the lower strut 16 is attached to the front support bracket 9 using the holding pin 32. By coupling, the running frame 8 is held in a substantially horizontal state, and the rear part of the running frame 8 is made to protrude further rearward than the loading platform 2.

Next, after moving the chain block 13 supported by the trolley 12 to the rear end of the traveling frame 8, the chain block 13 lifts up the cargo placed on the ground or on a platform behind the loading platform 2. Next, the load is pushed or pulled by human power to move it forward together with the trolley 12 and the chain block 13, and then the chain block 13 lowers the load onto the loading platform 2.

When unloading the cargo on the loading platform 2, the cargo is hoisted by the chain block 13, and then pushed or towed by human power and moved backward together with the trolley 12 and the chain block 13. Loading platform 2
Lower the vehicle to the ground or onto a platform at the rear of the vehicle.

When the truck 1 is to run, as shown in FIG. In the state where it is rotated to stand upright, the lower support column 16 is connected to the front support bracket 9 by the holding pin 32, and the entire traveling frame 8 is held above the loading platform 2, and the truck is Lower the crane's center of gravity.

When carrying out this invention, chain block 1
3 may be a manual chain block, and as the retractable support rod 38, a helical spring is interposed between the piston fixed to the piston rod and the bottom of the cylinder in which the piston is fitted. You may also use

Moreover, as a means for fixing the front support column 10 to the front support fitting 9 in the upright position and the backward inclined position, any means other than those shown in the drawings may be employed.

As shown in FIG. 4, when the portal frame 4 and the front strut 10 are tilted rearward, the weight of the portal frame 4, the running frame 8, the front strut 10, etc. Pillar 16
Since the lower end of the front support member 9 is pressed against the front stopper 25 and the portal frame 4 and the front column 10 are held in a rearward inclined state, the front pin hole 30 in the front support fitting 9 may be omitted.

〔Effect of the invention〕

According to this invention, by pressing or pulling the vertical frame 5 or the front column 10 rearward, the portal frame 4 and the front column 10 are simultaneously tilted in a direction in which they fall backward, and the traveling frame 8 can be held in a horizontal state with the rear part of the traveling frame 8 protruding rearward from the rear end of the loading platform 2 of the truck 1, so that the chain block 13 supported by the trolley 12 can be held in a horizontal state. Loading cargo placed on the ground or on a platform behind the loading platform 2 onto the loading platform 2 by moving in the front-rear direction between the upper part behind the loading platform 2 in 1 and the upper part of the loading platform 2, The cargo loaded on the cargo platform 2 can be unloaded onto the ground or on a platform at the rear of the cargo platform 2. Therefore, the cargo can be loaded and unloaded without rotating the portal frame 4 and front support 10. Furthermore, when the truck 1 is to be driven, the vertical frame 5 or the front column 10 is simply pushed or pulled forward to simultaneously raise the portal frame 4 and the front column 10 upright. At the same time, by shortening the front strut 10, the center of gravity of the truck crane can be placed at a lower position in the front, allowing the truck crane to travel in a stable state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially longitudinal side view showing the portal frame and front support of a truck crane in an upright state, and FIG. 2 is a plan view thereof; Figure 3 is the first
Figure 4 is a rear view of the truck crane in the state shown in the figure. Figure 4 is a partially longitudinal side view showing the truck crane with its portal frame and front strut tilted. Figure 5 is the length of the front strut. FIG. 6 is an enlarged vertical side view showing the attachment part of the lower part of the front strut to the front support fitting; FIG. 7 is a cross-sectional view taken along line A-A in FIG. 6; , FIG. 8 is a sectional view taken along the line B--B in FIG. 6. In the figure, 1 is a truck, 2 is a loading platform, 3 is a rear support bracket, 4 is a portal frame, 5 is a vertical frame, 6 is a horizontal shaft, 7 is a horizontal frame, 8 is a running frame, and 9 is a front support bracket. , 10 is the front strut, 11
is an upper support shaft, 12 is a trolley, 13 is a chain block, 15 is a support tube, 16 is a lower support, 17 is an upper support, 19 is a locking pin, 21 is a locking pin insertion spring, 22 is a lower locking Hole, 23 is upper locking hole, 2
4 is a strut length adjustment lock device, 25 is a front stopper, 26 is a rear stopper, 28 is a support shaft, 30 is a front pin hole, 31 is a rear pin hole, 32 is a holding pin,
34 is a wheel, 35 is a frame, 36 is a hook, 3
7 is a stopper, and 38 is a retractable support rod.

Claims (1)

[Claims] 1 The lower ends of the vertical frames 5 on both sides of the gate-shaped frame 4 are rotatably attached to the rear support fittings 3 fixed to the left and right sides of the rear of the loading platform 2 in the truck 1 by means of horizontal shafts 6 extending in the left-right direction. ,
A rear end portion of a traveling frame 8 extending in the front-rear direction is rotatably connected to the center portion of the horizontal frame 7 of the portal frame 4, and a front support fixed to the center of the front portion of the loading platform 2. Attach the lower support 1 to the metal fitting 9.
6, an upper strut 17 slidably fitted thereto, and a strut length adjustment lock device 24. and the upper support column 17 are connected via a retractable support rod 38,
The upper end of the front strut 10 is pivotally attached to the front end of the traveling frame 8 by an upper support shaft 11 extending in the left-right direction, so that when the rear part protrudes rearward than the loading platform 2, it is almost horizontal. A truck crane characterized in that a trolley 12 to which a chain block 13 is attached is movably mounted on the traveling frame 8.