JP2014009043A - Pallet truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a table capable of surely placing documents on a pallet truck regardless of handle operation.SOLUTION: A pallet truck 1 is composed of a cargo placing part 2 for placing a cargo, an operation part 5 for allowing a worker to perform steering operation and lifting operation and a lifting device 3 for lifting the cargo placing part 2, and a table 4 for placing documents is installed in a rear part of the cargo placing part 2, and the table 4 is composed of an installation part 41 to a lifting device installing part 28 of the cargo placing part 2, a column 42 erected on the installation part 41 and a placing table 43 fixed to the upper end of the column 42, and the installation part 41 is detachably installed on a lifting device connecting part 28 formed in a rear upper part of the cargo placing part 2.

Description

  The present invention relates to a pallet truck for carrying goods, and more particularly, to a technique for a table placed on the vicinity of a handle of a pallet truck for placing forms.

  2. Description of the Related Art Conventionally, a technique in which a table that allows a document to be placed on a handle protruding from a carriage mounting table is known. For example, it is a technique shown in Patent Document 1.

  In the technique shown in Patent Document 1, in a cart for transporting a load, a handle protrudes upward from the rear portion of the mounting table on which the load is placed, and a table is detachably attached to the upper portion of the handle. The table includes a fixed portion, a table body, a rotating shaft, and a stopper, and is configured to be switchable between a use position in which the table body is protruded rearward of the handle and a storage position in which the table body is located in the lower front of the handle.

  However, when the table in Patent Document 1 is attached to the handle of the pallet truck, the handle placed on the table is turned up and down to raise the loading platform. In addition, when the table body is placed in a horizontal use position and forms are placed and filled in on the table body, the handle may tilt backward when a load is applied to the table body.

Japanese Patent No. 4854817

  Therefore, an object of the present invention is to make it possible to arrange on a pallet track a table on which forms can be reliably placed regardless of handle operation.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, according to claim 1, in a pallet truck comprising a luggage placement section for placing a luggage, an operation section for an operator to perform a steering operation and a lifting operation, and a lifting device for raising and lowering the luggage placement section. Is mounted on the rear portion of the luggage placing portion, the table is attached to the lifting device attaching portion of the luggage placing portion, a support column standing on the attachment portion, and an upper end of the support column. The mounting portion is detachably mounted on a lifting / lowering device connecting portion formed at a rear upper portion of the luggage mounting portion.

According to a second aspect of the present invention, the front end of the placing table is disposed behind the rear end of the load placing surface of the load placing unit, and the rear end of the placing table is disposed forward of the handle of the operation unit. is there.
According to a third aspect of the present invention, a front / rear inclination angle changing means is formed in the mounting portion, and the front / rear inclination angle changing means is arranged such that the front end of the mounting table at the frontmost inclined position is located behind the rear end of the load placement surface, The rear end of the mounting table when the forward / backward inclination angle changing means is at the last inclined position is arranged in front of the handle of the operation unit.

According to a fourth aspect of the present invention, the upper end height of the mounting table is arranged at a position lower than the lower end of the grip extending in the horizontal direction from the upper portion of the handle in the state where the load placing portion is raised to the maximum. Is.
6. The upper end of the mounting table according to claim 5, wherein a vertical height adjusting means is formed on the support column, and the vertical height adjusting means is in the highest position and the load placement portion is in the highest position. The height is arranged at a position lower than the lower end of the grip.

As effects of the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the operator who operates the pallet truck can easily see the forms placed on the table with the table positioned in front of the operation unit, and can easily write on the forms. . Further, since the table can be easily configured, it can be manufactured at low cost, and can be easily retrofitted to an existing pallet truck.
In claim 2, the table does not interfere with the steering operation and the lifting operation, and when the luggage is placed on the luggage placing portion, the table does not hit the luggage and the both may be damaged. Absent.
According to the third aspect, the front / rear inclination angle changing means can change the front / rear inclination angle of the mounting table according to the operator, thereby improving the work efficiency. And after an angle change, a mounting base does not contact | abut with a load and a handle | steering-wheel, and it does not become an obstacle for handle operation or load loading.
According to a fourth aspect of the present invention, when the handle is rotated to the left and right in a state where the load placing portion is raised to the maximum, the grip does not come into contact with the placing stand, and the placing stand obstructs the handle operation. Don't be.
According to the fifth aspect, the height of the mounting table can be adjusted according to the operator by the vertical height adjusting means, so that the work efficiency can be improved. In addition, since the handle grip does not come into contact with the mounting table after the adjustment by the vertical height adjusting means, it is not necessary to confirm interference with the grip when adjusting the mounting table height. Does not interfere with handle operation.

The side view which shows the whole structure of the pallet truck which attached the table of this invention. Similarly front view. The enlarged side view of a raising / lowering apparatus. The perspective view of a table. (A) is a side view of the attachment part in the state which inclined the table back, (b) is a side view of the state which inclined the front similarly. The rear view of the raising / lowering device connection part of the Example which attaches the attachment part of a table from a side. Sectional drawing of the Example which comprised the support | pillar so that height adjustment was possible.

Hereinafter, the overall configuration of the pallet truck 1 will be described with reference to FIGS. 1, 2, and 3.
In the following description, it is assumed that the direction of the arrow F shown in FIG.

  The pallet truck 1 includes a load placement unit 2 on which a load is placed, an operation unit 5 in which an operator performs a steering operation and a lift operation, and a lift device 3 that lifts and lowers the load placement unit 2.

  The luggage placing portion 2 is inserted into the side space of the pallet on which the luggage is placed and lifted. The baggage placing portion 2 is disposed in a pair of left and right cargo beds 21 and 21 that are parallel to the left and right and extend in the front-rear direction, and front traveling wheels 22 and 22 that are disposed in front lower portions of the left and right cargo beds 21 and 21 and can be raised and lowered. And a base body 23 that extends obliquely upward and rearward from the rear part of the loading platforms 21 and 21 and is connected to the lifting device 3.

  The loading platform 21 has an upper surface as a pallet mounting surface. Since the loading platform 21 is configured symmetrically, only one of the left and right sides will be described. One end of an arm 24 is supported at the front part of the loading platform 21 so as to be rotatable up and down, and is stored in the loading platform 21. A traveling front wheel 22 is rotatably supported at the other end of the arm 24. One end of the connecting rod 25 is pivoted to one side of the arm, the connecting rod 25 is housed in the loading platform 21 and extends rearward, and the other end of the connecting rod 25 is connected to one end of the lifting arm 26. . The lifting arm 26 has a bell crank ("<") shape when viewed from the side, and a central portion is rotatably supported by the base body 23. The other end of the lifting arm 26 is a bearing body 31 of the lifting device 3 described later. It is pivotally supported by.

  The base body 23 is configured in a box shape having a substantially triangular shape when viewed from the front, and is disposed so as to incline from front to back and rear to high. The rear ends of the loading platforms 21 and 21 are fixed to the lower surfaces of the left and right sides of the base body 23, and a support shaft 27 that pivotally supports the elevating arm 26 is provided horizontally on the upper end. A lifting device connecting portion 28 extends rearward from the upper left and right center ends of the base body 23.

  The upper surface of the lifting / lowering device connecting portion 28 is configured in a substantially horizontal plane, and the mounting portion 41 of the table 4 is detachably mounted on the lifting / lowering device connecting portion 28. The rear part of the lifting / lowering device connecting portion 28 is formed in a boss shape, and the upper end of the ram piston 32 of the lifting / lowering device 3 is fixed by a bolt 60 so as to be pivotable left and right. In other words, screw holes are opened on the left and right side surfaces of the rear part of the lifting device connecting portion 28, and the bolts 60 and 60 are screwed into the screw holes toward the ring-shaped grooves formed at the upper end of the ram piston 32, so that they are secured from coming off. Yes. However, the position of the screw hole is not limited, and the screw hole can be provided on the rear surface or the front surface of the lifting device connecting portion 28.

As shown in FIG. 3, the elevating device 3 includes a hydraulic base 35 provided with a switching valve, a relief valve, and an oil passage, a hydraulic cylinder 37 that is vertically fixed to the front portion of the hydraulic base 35, and a hydraulic pressure A traveling rear wheel 34 that is rotatably supported on an axle 30 that is provided horizontally at the lower end of the cylinder 37, a bearing body 31 that is rotatably supported on the outer periphery of the lower portion of the hydraulic cylinder 37, and the hydraulic cylinder 37 on the hydraulic base 35. An oil tank 33 disposed on the outer periphery of the hydraulic cylinder 37, a ram piston 32 that is provided on the upper portion of the hydraulic cylinder 37 so as to be extendable and raised when hydraulic pressure is supplied, and a hydraulic pump 36 provided on the rear portion of the hydraulic base 35 A plunger piston 38 for pressurizing the hydraulic pump 36, and the like.
The traveling rear wheel 34 is integrally connected to the hydraulic base 35 and the operation unit 5, and is rotated right and left in conjunction with the left and right rotation of the handle 51 of the operation unit 5. In this embodiment, it can be rotated to the left and right by about 180 degrees.

  The operation unit 5 includes a handle base bracket 54 fixed to the rear part of the oil tank 33, a handle base 55 connected to the upper part of the plunger piston 38 and the rear part of the handle base bracket 54, and an upper part of the handle base 55. A handle 51 fixed to the handle 51, a grip 52 provided on the upper portion of the handle 51, and a lift switching lever 53 disposed along the grip 52.

  The grip 52 is formed in a rectangular loop shape that is substantially horizontally long when viewed from the front, and an elevation switching lever 53 is provided at the center thereof. The raising / lowering switching lever 53 is connected to an operation portion of a switching valve provided in the hydraulic base 35, and the hydraulic oil is supplied to the hydraulic cylinder 37 by the operation of the raising / lowering switching lever 53 and the relief from the hydraulic cylinder 37 to the oil tank 33. Can be switched. However, the shape of the grip 53 is not limited, and may be an elliptical shape or a horizontal bar.

  In such a configuration, when the raising / lowering switching lever 53 is switched to the raised position and the handle 51 is turned up and down, the plunger piston 38 is raised and lowered, and the pressure oil from the hydraulic pump 36 to the hydraulic cylinder 37 via the switching valve. The oil is fed and pushes up the ram piston 32. By this rise, the lifting device connecting portion 28 and the base body 23 at the rear portion of the loading platform 21 are lifted. As the base body 23 is raised, the support shaft 27 is raised, the lifting arm 26 is turned, the connecting rod 25 is pulled, the arm 24 is turned downward, and the traveling front wheel 22 is moved downward. As a result, the rear part and the front part of the loading platform 21 are lifted, and the load can be lifted. By pulling or pushing the grip 52 in the lifted state, the traveling front wheel 22 and the traveling rear wheel 34 roll, and the pallet truck 1 can carry the load. When the elevation switch lever 39 is switched to the lowered position after the movement, the switching valve is switched, the pressure oil is returned to the oil tank 33, and the ram piston 32 is lowered by its own weight.

As shown in FIG. 4, the table 4 is fixed to the attachment portion 41 to the luggage placement portion 2 (elevating device connecting portion 28), the support column 42 standing on the attachment portion 41, and the upper end of the support column 42. And a mounting table 43 provided.
The mounting portion 41 includes an upper plate 41a and side plates 41b and 41b. The upper plate 41a is made of a plate material and matches the shape of the upper surface of the lifting device connecting portion 28 formed on the rear portion of the luggage placement portion 2. It is made into the shape which can be mounted on the upper surface of the raising / lowering device connection part 28. FIG. The lower end of the support post 42 is fixed on the front portion of the upper plate 41a, and a screw hole 41c is opened at the rear portion of the upper plate 41a. Side plates 41b and 41b are provided downward from both the left and right sides of the rear portion of the upper plate 41a, and mounting holes 41d and 41d are opened in the side plates 41b and 41b. The mounting hole 41d is opened so as to coincide with the screw hole provided on the side surface of the lifting device connecting portion 28 when the table 4 is mounted. However, when a screw hole is provided on the rear surface of the lifting device connecting portion 28, the side plate 41b extends downward from the rear end of the upper plate 41a.
In this way, the table 4 is attached using the screw holes and bolts 60 for fixing the stopper. That is, the table 4 is configured to be retrofitted. Since the looseness is generated only by fixing the attachment portion 41 to the lifting device connecting portion 28 with the bolt 60, the looseness can be eliminated by tightening the bolt 61 in the screw hole 41c provided in the rear portion of the upper plate 41a.

Further, the front and rear inclination angle changing means 6 can be formed on the attachment portion 41. As shown in FIG. 5, the front / rear inclination angle changing means 6 is provided with a screw hole 41c on the upper plate 41a on the rear side of the mounting hole 41d and screwed with a bolt 61, and an adjustment hole on the front side of the mounting hole 41d. 41e is provided and the bolt 62 is screwed. Then, as shown in FIG. 5A, by loosening the bolt 61 and tightening the bolt 62, the upper plate 41a is inclined (rearly inclined) so that the rear is lowered with the bolt 60 as the center. As shown in b), when the bolt 62 is loosened and the bolt 61 is tightened, the upper plate 41a is tilted (tilted forward) so that the front is lowered around the bolt 60. Thus, the angle can be adjusted by tightening the bolts 61 and 62. However, the configuration of the front / rear inclination angle changing means 6 is not limited to the above configuration, but a hinge is provided at the front end or the rear end of the upper plate 41a, and the mounting hole 41d is a long hole centered on the hinge. An angle adjusting bolt can be provided on the opposite side. Further, it is possible to provide the front / rear inclination angle changing means 6 at the upper end of the support column 32. Thus, the front / rear inclination angle changing means can change the front / rear inclination angle of the mounting table in accordance with the operator, thereby improving the work efficiency. And after an angle change, a mounting base does not contact | abut with a load and a handle | steering-wheel, and it does not become an obstacle for handle operation or load loading.
Further, the mounting portion 41 is configured to have a reverse U-shape in rear view and attached from above, but as shown in FIG. It is also possible to adopt a configuration for more attachment.

The support column 42 is composed of a circular or square rod or pipe, and the lower end is fixed substantially vertically to the front upper surface of the upper plate 41 a of the mounting portion 41, and the upper end is fixed to the lower surface of the mounting table 43.
The vertical height adjusting means 7 can be formed on the support 42. That is, as shown in FIG. 7, the vertical height adjusting means 7 includes a pipe 42a, a rod 42b that is inserted into the pipe 42a and can be expanded and contracted, and a fixing screw 42c for fixing at a desired expansion / contraction position. The lower end of the pipe 42a is fixed to the front upper surface of the upper plate 41a of the mounting portion 41, and the lower portion of the rod 42b is inserted into the upper portion. The lower part of the rod 42 b is inserted into the pipe 42 a and the upper part is fixed to the lower surface of the mounting table 43. The fixing screw 42c is screwed to the upper side surface of the pipe 42a, and the rod 42b can be fixed at a desired height by screwing. However, the structure for fixing the rod 42b at a desired height is not limited, and the rod 42b may be configured by a fixing hole opened to the rod 42b at a predetermined interval from the pin. Further, the rod 42b and the pipe 42a can be turned upside down so that the lower end of the rod 42b can be fixed to the upper plate 41a of the mounting portion 41 and the upper end of the pipe 42a can be fixed to the mounting table 43. In this way, the height of the mounting table can be adjusted according to the operator by the vertical height adjusting means, and the work efficiency can be improved.

  As shown in FIG. 4, the mounting table 43 is configured by a substantially square steel plate, but the shape and material thereof are not limited, and the mounting table 43 may be a rigid resin plate or the like. The mounting table 43 is fixed to the upper end of the support post 42 at the bottom of the rear left and right center. In the present embodiment, the mounting table 43 is fixed while being tilted from the front height to the rear. The rear part of the mounting table 43 is bent upward so that the documents, writing tools and the like placed on the mounting table 43 do not fall from the mounting table 43. However, the configuration for preventing the forms, writing instruments, and the like from dropping from the mounting table 43 is not limited to the folding configuration of the mounting table 43, but a clip, a locking hook, a concave portion, or a convex portion on a part of the mounting table 43. A hole, a notch or the like can also be formed.

The table 4 configured as described above has its front-rear position and height set.
That is, as shown in FIG. 1, the front end position A of the mounting table 43 of the table 4 is more than the luggage mounting surface of the luggage mounting unit 2, that is, the rear end position of the loading table 21 (front end position of the base body 23) B. Place behind. In this way, even if a load is placed on the load placement portion 2, the load does not come into contact with the placement table 43 of the table 4, the load is not damaged, and does not get in the way.

  Further, the rear end position C of the mounting table 43 is disposed in front of the front end position D of the handle 51 of the operation unit 5. More specifically, the handle 51 (traveling rear wheel 34) is moved forward in front of the front end position D of the handle 51 in a state in which the handle 51 (traveling rear wheel 34) has been rotated to the maximum left and right (rotated left and right by 90 degrees) about the vertical axis. Be placed. Thus, when the operation unit 5 is steered left and right, the handle 51 does not come into contact with the table 4 and does not interfere with the steer operation.

  Further, even when the front and rear inclination angle changing means 6 is formed on the mounting portion 41, the front end of the mounting table 43 in a state where the front and rear inclination angle changing means 6 is adjusted to the frontmost inclination position (FIG. 5B). The position A is disposed behind the rear end position B of the luggage placement surface. In this way, even if a load is placed on the load placement portion 2, the load does not come into contact with the placement table 43 of the table 4, the load is not damaged, and does not get in the way.

  Further, the rear end position C of the mounting table 43 in the state in which the front / rear inclination angle changing means 6 is adjusted to the last inclined position (FIG. 5A) is arranged in front of the front end position D of the handle 51 of the operation unit 5. It is what is done. More specifically, the handle 51 (traveling rear wheel 34) is moved forward in front of the front end position D of the handle 51 in a state in which the handle 51 (traveling rear wheel 34) has been rotated to the maximum left and right (rotated left and right by 90 degrees) about the vertical axis. Be placed. Thus, when the operation unit 5 is steered left and right, the handle 51 does not come into contact with the table 4 and does not interfere with the steer operation.

  In addition, the upper end height position E of the mounting table 43 in the state where the load placing unit 2 is raised to the maximum is the lower end position of the grip 52 extending horizontally from the upper part of the handle 51 of the operation unit 5. It is arranged at a position lower than G. In this way, regardless of the lifting operation of the baggage placement portion 2, even when the handle 51 (traveling rear wheel 34) is rotated to the maximum left and right (rotated 90 degrees to the left and right) about the vertical axis of the hydraulic cylinder 37. The upper end of the mounting table 43 is positioned below the lower position F of the grip 52, and the grip 52 does not come into contact with the table 4 when the operation unit 5 is steered left and right. Does not interfere with operation.

  Further, in the configuration in which the vertical height adjusting means 7 is provided on the support column 42, in the state in which the vertical height adjusting means 7 is adjusted to the maximum ascending position and the load placing portion 2 is raised to the maximum, The upper end height position E of the mounting table 43 is disposed at a position lower than the lower end position G of the grip 52 of the handle 51. In this way, the handle 51 (traveling rear wheel 34) is rotated to the maximum left and right about the vertical axis of the hydraulic cylinder 37 regardless of the up / down height adjusting means 7 of the support column 42 and the lifting operation of the luggage placement portion 2. Even in the state (rotated 90 degrees left and right), the upper end of the mounting table 43 is positioned below the lower position G of the grip 52, and when the operation unit 5 is steered left and right, the grip 52 is moved to the table. 4 does not contact the steering operation.

DESCRIPTION OF SYMBOLS 1 Pallet truck 2 Luggage mounting part 3 Lifting device 4 Table 5 Operation part 28 Lifting device connection part 41 Mounting part 42 Support | pillar 43 Mounting base

Claims (5)

  In a pallet truck comprising a luggage placement section for placing a luggage, an operation section for an operator to perform a steering operation and a lifting operation, and a lifting device for raising and lowering the luggage placement section, a table on which a document is placed is the luggage The table is attached to the rear portion of the mounting portion, and the table includes a mounting portion to the lifting device mounting portion of the luggage mounting portion, a support column standing on the mounting portion, and a mounting table fixed to the upper end of the support column. The pallet truck is characterized in that the mounting portion is detachably mounted on a lifting device connecting portion formed at a rear upper part of the luggage placing portion.   The front end of the mounting table is disposed rearward of the rear end of the baggage placement surface of the luggage mounting unit, and the rear end of the mounting table is disposed forward of the handle of the operation unit. Pallet truck as described in.   The mounting portion is formed with front / rear inclination angle changing means, and the front / rear inclination angle changing means is disposed at the front end of the loading table at the frontmost inclination position behind the rear end of the load placement surface, and the front / rear inclination angle changing means is The pallet truck according to claim 1, wherein a rear end of the mounting table in the last tilted position is disposed in front of a handle of the operation unit.   The upper end height of the mounting table is disposed at a position lower than a lower end of a grip extending in a horizontal direction from an upper portion of the handle in a state where the load placing portion is raised to the maximum. The pallet truck according to any one of claims 1 to 3.   The support for supporting the mounting table is provided with vertical height adjusting means, and when the vertical height adjusting means is in the highest position and the load placement portion is in the highest position, the upper end height of the mounting table is The pallet truck according to any one of claims 1 to 3, wherein the pallet truck is disposed at a position lower than a lower end of the grip.

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