JPH0524076B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a chain block which is moved and rotated in the vicinity above the loading platform of a truck, and which lowers the center of gravity when the truck crane is traveling. This relates to a truck crane that can perform

[Prior art]

Conventionally, as a truck crane,
As disclosed in Publication No. 13754, the base end of a boom is rotatably attached to the top of a portal frame that runs in the front and back direction on the loading platform of a truck, and a chain block is attached to a trolley that moves along the boom. It is known that the structure is equipped with a

[Problem that the invention seeks to solve]

In the case of the conventional truck crane, since the portal frame cannot be shortened during traveling, the center of gravity of the truck crane becomes high, resulting in a problem that the traveling stability of the truck crane is poor.

[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. A traveling rail 3 is fixed, and traveling wheels 6 placed on the traveling rail 3 are attached to a moving frame 5 fixed to the lower end of each vertical frame in the portal frame 4.
The base end of a traversing arm 7 is rotatably attached to the upper part of one of the vertical frames, and a chain block 9 is attached to a trolley 8 provided on the traversing arm 7 so as to be movable traversingly. The gate-shaped frame 4 is composed of a gate-shaped elevating frame 28 having an elevating vertical frame 27, and a main vertical frame 12 into which the elevating vertical frame 27 is fitted so as to be able to rise and fall freely, and the main vertical frame 12 and the elevating vertical frame 27 are connected via a retractable push-up member 29, the elevating vertical frame 27 is provided with a lower locking hole 37 and an upper locking hole 38, and a holding metal fitting 33 fixed to the main vertical frame 12 is connected. The truck crane is characterized in that a locking pin 34 that is removably inserted into the lower locking hole 37 or the upper locking hole 38 is slidably fitted therein.

〔Example〕

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

The drawing shows one embodiment of the present invention, in which running rails 3 with an H cross section extending in the front and rear direction are placed on both left and right sides of a loading platform 2 of a truck 1, and a lower flange of the running rails 3 is mounted. is fixed to the loading platform 2 with bolts 10, a plurality of running wheels 6 attached to a moving frame 5 are mounted on the upper flange of each running rail 3, and the running rail 3 is mounted on the moving frame 5.
A portal frame fall prevention roller 11 that is engaged with the lower surface of the upper flange is attached to the rear of each movable frame 5, and the lower end of the main vertical frame 12 made of a vertical metal tube is attached to the rear of each moving frame 5. The upper part of the frame 12 and the front part of the movable frame 5 are connected via an inclined brace 13, and the rear end of the traveling rail 3 is provided so that the movable frame 5 can be detached rearward from the traveling rail 3. A stopper 14 is fixed to prevent this.

The intermediate portions of the pair of clamp members 15 and 16 arranged on both sides of the traveling rail 3 in the width direction are pivotally connected to the moving frame 5 by a support shaft 17 extending in the front-rear direction, and have a left-hand screw thread 18 and a right-hand thread. Spiral rod 1
A square shaft portion 21 for engaging a rotary tool such as a ratchet spanner is provided in the middle part of the double-threaded screw rod 20 having a left-hand screw rod 18, and a left female screw member 22 screwed into the left-hand screw rod 18 and a right-handed screw rod 19 are screwed. The fitted right female screw member 23 is pivotally connected to the clamp members 15 and 16 by a pin 24 extending in the front and back direction, and the pair of clamp members 15 and 16 pivotally connected to the movable frame 5 and the clamp member 15 are , 16, and a double threaded rod 20 screwed onto the left female threaded member 22 and right female threaded member 23.

The upper ends of a vertical elevating frame 27 made of a vertical metal tube are fixed together by welding to both ends of a horizontal frame 26 made of a metal tube extending in the left-right direction, thereby forming a gate-shaped elevating frame 28. Each vertical frame 27 in the frame 28
is fitted into the main vertical frame 12 from above so as to be able to rise and fall freely, and the lower part of the main vertical frame 12 and the middle part of the elevating vertical frame 27 are a retractable push-up member made of a telescopic cylinder filled with gas. 29, and the gas pressure of the compressible push-up member 29 applies a push-up force to the lifting frame 28.
The main vertical frame 12 and the elevating vertical frame 27
A vertical frame is constituted by these, and a portal frame 4 is further constituted by each main vertical frame 12 and the elevating frame 28.

A holding member 39 to which the base end of the horizontal arm 7 for traversing is fixed is fitted into the upper part of one of the vertical frames 27 of the elevating frame 28 so as to be rotatable and not move downward. 7 is a channel steel with a lip that opens downward, and wheels 3 on both the left and right sides of the trolley 8 are used.
0 is placed on the lower flanges on both sides of the traversing arm 7, and stoppers 31 for controlling the movement of the trolley 8 are fixed to the distal and proximal ends of the traversing arm 7. The upper part of the main body of the chain block 9 operated by the trolley 8 is detachably attached to the lower part of the trolley 8 by bolts 32. Furthermore, a movable frame 5 that runs along each traveling rail 3, a gate-shaped frame 4 fixed to each movable frame 5, and a rotatable vertical frame 27 on one side of the gate-shaped frame 4 are provided. The attached traverse arm 7,
A crane is constituted by a chain block 9 supported by the traversing arm 7 via a trolley 8.

A holding fitting 33 is fixed to the upper part of the main vertical frame 12, and a locking pin 34 is slidably inserted across the holding fitting 33 and the main vertical frame 12, and the locking pin 34 is inserted in the holding fitting 33. A locking pin insertion spring 36 is interposed between the spring receiving flange 35 fixed to the spring receiving flange 35 and the end plate of the holding fitting 33, and a lower locking hole 37 is provided in the lower part of the vertical vertical frame 27. frame 27
An upper locking hole 38 is provided in the upper part of the holder.

When the locking pin 34 is pulled against the force of the locking pin insertion spring 36 and pulled out from the locking hole, the lifting frame 28 can be moved up and down; When the lower locking hole 37 of the elevating vertical frame 27 reaches the position where it matches the locking pin 34, the locking pin 34 is pressed by the locking pin insertion spring 36 and the lower locking hole 37 is pressed by the locking pin insertion spring 36.
The lift frame 28 is automatically inserted into the lift frame 28, and the lift frame 28 is locked in the raised position. Further, as the elevating frame 28 is moved downward, when the upper locking hole 38 of the elevating vertical frame 27 reaches the position where it matches the locking pin 34, the locking pin 34 is inserted into the locking pin insertion spring. 36
It is pressed by the upper locking hole 38 and automatically fits into the upper locking hole 38, and the elevating frame 28 is locked in the lowered position.

A locking bracket 41 having a locking hole 40 is fixed to the lower end of the holding member 39, and a support bracket 42, which is disposed at a slightly lower level than the locking bracket 41, is located at the middle of the vertical frame 27. The supporting bracket 42 is provided with a through hole 43 for locking insertion and a groove 44 connected to a part of the periphery of the through hole 43, and a box is provided at the bottom of the supporting bracket 42. shaped support member 4
A locking rod 4 to which 5 is fixed and an operating handle 46 is fixed.
7 is fitted into the through hole 43 and the support member 45 so as to be slidable and rotatable.

The groove 44 is formed on the side surface of the distal end of the locking rod 47.
A stopper pin 48 inserted therein is fixed, and a locking rod insertion spring 50 is interposed between a spring receiving flange 49 fixed to the intermediate portion of the locking rod 47 and the end plate of the support member 45. .

A bracket 42 for supporting the stopper pin 48
When the locking rod 47 is engaged with the lower surface of the locking bracket 41, the locking rod 47 is held in a state where it is pulled out from the locking hole 40 of the locking bracket 41, so that the traversing arm 7 can be freely rotated. When the truck is to be driven, the locking rod 47 is first rotated to fit the stopper pin 48 into the lower end of the groove 44, and then the traversing arm 7 is turned rearward, so that the traversing arm 7 is raised and lowered vertically. When reaching the position protruding backward from the frame 27, the locking hole 40 matches the locking rod insertion through hole 43, so the locking rod 47 is pressed by the locking rod insertion spring 50 and locked. The arm 7 is automatically fitted into the hole 40 to prevent the traverse arm 7 from pivoting. Next, the lifting frame 28 is locked in the lowered position,
and move the portal frame 4 to the front of the loading platform 2,
The moving frame 5 is fixed to the traveling rail 3 by a rail clamp 25.

When loading cargo placed on the ground onto the loading platform 2 of the truck 1 using the truck crane configured as described above, the crane is manually moved to the traveling rail as shown by the solid line in Figure 1. 3 to the rear end position and with the lifting frame 28 locked in the raised position, the cargo on the ground is lifted by the chain block 9, and then the portal frame 4 is moved forward by human power and the traversing arm 7 is rotated. After performing the appropriate combinations, the cargo is lowered onto the loading platform 2 by the chain block 9.

After loading the cargo, the traversing arm 7 is rotated backward and locked, the elevating frame 28 is locked in the lowered position, and the clay is moved to the front of the traveling rail 3 and the rail is moved. Clamp 25
and then drive the truck 1 to the destination transportation location.

When unloading cargo from bed 2 of truck 1,
The rail clamp 25 is released, the lifting frame 28 is locked in the raised position, and the portal frame 4 is manually moved in the longitudinal direction and the traversing arm 7 is moved so that the chain block 9 is positioned above the load to be lowered. Then, after hoisting the cargo using the chain block 9, the rearward movement of the portal frame 4 by human power and the rearward rotation of the traversing arm 7 are performed in an appropriate combination. Afterwards, chain block 9 is lowered to lower the cargo to the ground.

When carrying out this invention, a manual chain block 9 may be used as the chain block 9, and as the retractable push-up member 29 that applies a push-up force to the lifting frame 28, a piston fixed to a piston rod may be used. A helical spring may be interposed between the piston and the bottom of the cylinder into which the piston is fitted.

[Effect of the invention] According to this invention, the loading platform 2 in the truck 1
A traveling rail 3 extending in the front and back direction is fixed to the left and right sides of the frame, and traveling wheels placed on the traveling rail 3 are mounted on a movable frame 5 fixed to the lower end of each vertical frame in the portal frame 4. 6 is attached to the top of one vertical frame of the portal frame 4, the base end of a traversing arm 7 is rotatably attached, and a trolley is provided on the traversing arm 7 so as to be movable traversing. 8, in a truck crane to which a chain block 9 is attached, the gate-shaped frame 4 includes a gate-shaped lifting frame 28 having a lifting vertical frame 27, and a main vertical frame into which the lifting vertical frame 27 is fitted so as to be able to rise and fall freely. 12, the main vertical frame 1
2 and the elevating vertical frame 27 are the compressible push-up member 2
9, and the elevating vertical frame 27
A lower locking hole 37 and an upper locking hole 38 are provided, and the holding fitting 33 fixed to the main vertical frame 12 is removably inserted into and inserted into the lower locking hole 37 or the upper locking hole 38. Since the locking pin 34 is slidably fitted, when loading and unloading cargo onto the loading platform 2 using a truck crane, the elevating frame 28 of the portal frame 4
By fixing the chain block 9 in the raised position, the chain block 9 can be placed at a high level, and the gate-shaped frame 4 can be placed at a high level.
By combining the forward and backward movement of the traverse arm 7, the rotation of the traverse arm 7, and the movement of the trolley 8 supporting the chain block 9, it is possible to easily load and unload tall cargo. , and when running a truck crane, lift frame 2
By fixing 8 in the lowered position, the center of gravity of the truck crane can be lowered and the truck crane can be run in a stable state.Furthermore, since the lifting force is applied to the lifting frame 28 by the compressible lifting member 29, the traversing arm 7, trolley 8, and chain block 9 can be easily pushed up by human power or the like.

[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 traverse arm of a truck crane in a state in which it is projected rearward, and Fig. 2 is a side view of the traverse arm of the truck crane. 3 is an enlarged sectional view taken along the line A-A in FIG. 1, FIG. 4 is an enlarged side view of the running section, and FIG.
6 is a longitudinal sectional front view of the rail clamp, FIG. 7 is a plan view thereof, FIG. 8 is a partial longitudinal sectional side view showing the locking device of the lifting frame, and 9
The figure is a longitudinal side view showing the rotation stop device for the traverse arm, and FIG. 10 is a sectional view taken along the line C--C in FIG. 9. In the figure, 1 is a truck, 2 is a loading platform, 3 is a running rail, 4 is a portal frame, 5 is a moving frame, 6 is a running wheel, 7 is a traversing arm, 8 is a trolley, 9 is a chain block, and 11 is a 12 is the main vertical frame, 14 is a stopper, 15 and 16 are clamp members, 20
22 is a left female threaded member, 23 is a right female threaded member, 25 is a rail clamp, 26 is a horizontal frame, 27 is an elevating vertical frame, 28 is an elevating frame, 29 is a compressible push-up member, 30 is a wheel, 31 is a stopper, 34 is a locking pin, 36 is a locking pin insertion spring, 37 is a lower locking hole, 38 is an upper locking hole,
40 is a locking hole, 41 is a locking bracket, 42 is a supporting bracket, 43 is a through hole for inserting a locking rod, 4
4 is a groove, 46 is an operating handle, 47 is a locking rod, 48
is a stopper pin, and 50 is a spring for inserting a locking rod.

Claims (1)

[Claims] 1. Traveling rails 3 extending in the front and rear direction are fixed to both left and right sides of the loading platform 2 of the truck 1, and the traveling rails 3 are fixed to the movable frame 5 fixed to the lower end of each vertical frame in the portal frame 4.
A running wheel 6 is mounted on the top of one vertical frame of the portal frame 4, and
A chain block 9 is attached to a trolley 8 to which the proximal end of the traverse arm 7 is rotatably attached, and the trolley 8 is provided on the traverse arm 7 so as to be movable in the traverse direction. 27, and a main vertical frame 12 in which the vertical frame 27 is fitted in such a way that the vertical frame 27 can be raised and lowered freely.
2 and the elevating vertical frame 27 are the compressible push-up member 2
9, and the elevating vertical frame 27
A lower locking hole 37 and an upper locking hole 38 are provided, and the holding fitting 33 fixed to the main vertical frame 12 is removably inserted into and inserted into the lower locking hole 37 or the upper locking hole 38. A truck crane characterized in that a locking pin 34 is slidably fitted therein.