JP4462633B2 - Pallet truck - Google Patents

Description

  The present invention relates to a technology for constructing a pallet truck that can easily change a manual travel pallet truck and an electric travel pallet truck.

2. Description of the Related Art Conventionally, a pallet truck that carries a cargo such as a pallet on a fork-shaped carrier is known. An operator can easily carry a work of transporting a load placed on a pallet using a pallet truck in a luggage storage area of a factory, a warehouse, or a store. In recent years, while various types of pallet trucks according to applications have been provided, electric traveling pallet trucks are also known (for example, Patent Document 1). This electric traveling pallet truck is provided with an electric unit at the rear part of the loading platform, and the rear wheels supported by the hydraulic jack device are driven by a drive unit such as a motor.
Japanese Unexamined Patent Publication No. Hei 6-99864

  Here, the configuration of the electric traveling pallet truck is connected to the steering unit via a link and the like, an electric unit placed at the rear of the loading platform, a drive unit laid on one of the left and right rear wheels, and the like. And a rear wheel provided with a drive unit. In such a configuration, when the steering handle is rotated greatly, the drive unit may protrude rearward and interfere with the worker's walking or hit an obstacle. In addition, since the drive unit is provided on one side of the left and right, the left and right weight balance is poor and traveling becomes unstable.

  On the other hand, when changing the specifications of a conventional manual travel pallet truck to an electric travel pallet truck, it is necessary to attach an operation switch for moving the steering wheel back and forth. Therefore, it is necessary to change and attach the grip, which causes a problem of increasing costs. Further, the wiring for connecting to the drive unit is exposed at the frame portion, which may cause disconnection. Further, when the specification is changed from the manual type to the electric traveling pallet truck, the rear wheels on the left and right sides are replaced, so that the shaft centers of the left and right rear wheels are displaced and it is difficult to move straight, and the traveling becomes unstable.

  Therefore, the problem to be solved is to provide a pallet truck that can easily change the specifications of the electric traveling pallet truck and the manual traveling pallet truck in the configuration of the pallet truck and can stably travel. .

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In Claim 1, the loading platform (20) which stood up the rear frame in the rear part of a pair of fork-shaped right and left mounting parts provided with the front wheel which can be moved up and down, and the hydraulic pressure arranged in the rear part of the loading platform (20) In the pallet truck comprising a jack device (10), a handle unit (70) for raising and lowering the hydraulic jack device (10), and a rear traveling unit provided at a lower portion of the hydraulic jack device (10), A rear traveling unit (80) for an electric traveling pallet truck (100) including a driving rear wheel (63), a deceleration case (62), and an electric motor (61) with respect to the jack device (10) and the loading platform (20); running wheel (160) and configured to be capable of replacement of a travel section (280) after the table (140) driven traveling pallet truck (200) comprising the hydraulic jack (10) When the rear wheel support member (18) protrudes downward to constitute the electric travel pallet truck (100), a bracket (42) configured to have a substantially portal shape in rear view, and a rear lower portion extending from the bracket (42). The rear wheel support member (18) is formed in the through hole of the frame-like table (40) which is configured by a guard (41) provided and provided with a through hole in the vertical direction at the center of the upper surface of the bracket (42). Inserted and supported, pivotally supported on one side of the bracket (42) on the rear side of the arms (22, 22) connected to the front wheel (21), and within the frame-like table (40), When the driving rear wheel (63) provided with the electric motor (61) is attached to the rear wheel support member (18) via the connecting pipe (50) to form the manual travel pallet truck (200), Connect the wheel support member (18) to the manual travel pallet. The table (140) for the track (200) is inserted into a shaft hole formed at the center of the left and right to be rotatably supported, and the arms (22, 22) can be rotated at both ends of the table (140). A wheel shaft (161) that supports and supports the left and right traveling wheels (160, 160) on both sides under the table (140) of the rear wheel support member (18) is provided on the rear wheel support member (18). It is inserted into the lower shaft hole and pivotally supported .

According to a second aspect of the present invention, in the pallet truck according to the first aspect, when configuring the electric traveling pallet truck (100), a key is provided separately from the traveling switch (74) for rotating the electric motor (61) forward and backward. When the switch (37) is provided and the key switch (37) is turned off, the driving rear wheel (63) is configured to be able to freely rotate, and can be manually driven and moved. is there.

  As effects of the present invention, the following effects can be obtained.

In Claim 1, the loading platform (20) which stood up the rear frame in the rear part of a pair of fork-shaped right and left mounting parts provided with the front wheel which can be moved up and down, and the hydraulic pressure arranged in the rear part of the loading platform (20) In the pallet truck comprising a jack device (10), a handle unit (70) for raising and lowering the hydraulic jack device (10), and a rear traveling unit provided at a lower portion of the hydraulic jack device (10), A rear traveling unit (80) for an electric traveling pallet truck (100) including a driving rear wheel (63), a deceleration case (62), and an electric motor (61) with respect to the jack device (10) and the loading platform (20); running wheel (160) and configured to be capable of replacement of a travel section (280) after the table (140) driven traveling pallet truck (200) comprising the hydraulic jack (10) When the rear wheel support member (18) protrudes downward to constitute the electric travel pallet truck (100), the bracket (42) configured to have a substantially portal shape in the rear view and the rearward and downward extending from the bracket (42). The rear wheel support member (18) is formed in the through hole of the frame-like table (40) which is configured by a guard (41) provided and provided with a through hole in the vertical direction at the center of the upper surface of the bracket (42). Inserted and supported, pivotally supported on one side of the bracket (42) on the rear side of the arms (22, 22) connected to the front wheel (21), and within the frame-like table (40), When the driving rear wheel (63) provided with the electric motor (61) is attached to the rear wheel support member (18) via the connecting pipe (50) to form the manual travel pallet truck (200), Connect the wheel support member (18) to the manual travel pallet. The table (140) for the track (200) is inserted into a shaft hole formed at the center of the left and right to be rotatably supported, and the arms (22, 22) can be rotated at both ends of the table (140). A wheel shaft (161) that supports and supports the left and right traveling wheels (160, 160) on both sides under the table (140) of the rear wheel support member (18) is provided on the rear wheel support member (18). Since it is fitted and supported by the lower shaft hole, parts such as a hydraulic jack device can be used in common in both types of pallet trucks for electric traveling and manual traveling. That is, it is possible to reduce the parts costs of the electric traveling pallet truck and the manual traveling pallet truck, and to reduce the number of manufacturing steps.

Further, in the case of the electric travel pallet truck 100, the connecting pipe 50 is interposed between the rear wheel support member 18 and the drive unit 60, so that the height position of the hydraulic jack device 10 can be adjusted. is there.
In addition, since the replacement structure is simple, the specification can be easily changed between the electric traveling pallet truck and the manual traveling pallet truck.

According to a second aspect of the present invention, in the pallet truck according to the first aspect, when configuring the electric traveling pallet truck (100), a key is provided separately from the traveling switch (74) for rotating the electric motor (61) forward and backward. When the switch (37) is provided and the key switch (37) is turned off, the driving rear wheel (63) is configured to be able to freely rotate, and can be manually driven and moved . In an electric travel pallet truck, manual travel can be performed even when the battery runs out or no electric travel is required. That is, the usability of the electric traveling pallet truck can be improved.

  Next, embodiments of the invention will be described.

  1 is a perspective view showing an overall configuration of an electric traveling pallet truck according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which each unit is separated, and FIG. 3 is a front view similarly showing a periphery of a driving rear wheel. FIG. 4 is a side view, FIG. 5 is a perspective view showing an overall configuration of a manual travel pallet truck according to another embodiment of the present invention, and FIG. 6 is a perspective view showing a state in which each unit is also separated. FIG. 7 is a front view showing the periphery of the rear wheel, and FIG. 8 is a side view.

  As shown in FIGS. 1 to 8, the electric traveling pallet truck 100 and the manual traveling pallet truck 200 of the present embodiment use the hydraulic jack device 10 and the loading platform 20 as a common unit. That is, with respect to the hydraulic jack apparatus 10 and the loading platform 20, the rear traveling unit 280 for the manual traveling pallet truck including the traveling wheels 160, the table 140, and the like, at least the table 40, the driving rear wheel 63, the speed reducer, the electric motor 61, and the like. The rear traveling unit 80 for the electric traveling pallet truck provided is configured to be replaceable.

  First, the electric traveling pallet truck 100 according to the present invention will be described in detail with reference to FIGS. 1 and 2. For easy understanding, the direction of arrow A in FIG. As shown in FIG. 1, an electric traveling pallet truck 100 includes a loading platform 20 having a pair of left and right fork-shaped mounting portions 24 and 24, and a hydraulic jack device that is arranged at the rear of the loading platform 20 to raise and lower the loading platform 20. 10, a handle unit (steering handle) 70 for raising and lowering the hydraulic jack device 10, a rear traveling unit 80 provided at a lower portion of the hydraulic jack device 10, and the like.

  Hereinafter, each unit will be described in detail with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, the loading platform 20 is provided with a pair of left and right mounting portions 24 that are formed in a fork shape so that an object to be transported such as a pallet can be mounted. In addition, at each front end portion of the placement portion 24, the front wheel 21 is provided so as to be able to move up and down. The front wheel 21 can be lowered by rotating (pumping) the handle unit 70 up and down to lift the mounting portion 24. On the other hand, it can be raised by operating the release lever 72 and the placing portion 24 can be lowered.

  As shown in FIGS. 1 and 2, the control unit 30 is attached to the inside of a rear frame 36 fixed to the rear end portion of the loading platform 20. The control unit 30 houses a battery 32, a charger 31, a control circuit, and the like in a substantially square box shape. Further, on the back surface of the control unit 30, operation means such as a key switch 37 and a safety switch (not shown) and display devices such as a battery meter (not shown) are arranged. The safety switch is a malfunction prevention switch that stops the key switch 37 without turning it off when the vehicle travels unintentionally.

  A hydraulic jack device support portion 35 protrudes rearward from the left and right center of the rear upper portion of the rear frame 36. The lower end of the hydraulic jack device support portion 35 is configured such that an upper end of a ram piston 13 described later is fitted. A support shaft 23 is rotatably mounted in the left-right direction at the lower part of the rear frame 36, and a pair of arms 22, 22 are fixed on the left and right sides of the support shaft 23. The arms 22 and 22 are configured in a bell crank shape. The arms 22 and 22 are fixed to the support shaft 23 at the center, one end extends rearward and pivotally supported on a side surface of a bracket 42 of the table 40 described later, and the other end is an inner side of the rear frame 36. It extends downward and is pivotally supported by a rod (not shown) connected to the front wheel 21.

  As shown in FIGS. 1 to 4, the table 40 includes a bracket 42 configured to have a substantially portal shape in rear view and covering a top surface and a side surface, and a guard 41 extending rearward and downward from the bracket 42. . The guard 41 is formed in a substantially inverted T shape and bulging backward. In addition, the guard 41 is fixed to the left and right sides of the belt-like plate at the lower portions of both sides of the bracket 42 and the upper end is fixed to the left and right center of the upper surface of the bracket 42. The bracket 42 is pivotally supported on one side on both sides by the rear side of the arms 22, 22, and has a through-hole in the vertical direction at the center of the upper and left sides so that the rear wheel support member 18 described later can be inserted and supported. . Note that the configuration of the guard 41 is not limited, and may be configured to cover the entire surface with a single plate as long as it covers the rear surface of the table 40. With such a configuration, the table 40 can be protected by storing the drive unit 60 therein. In this way, since the drive unit 60 is protected by the guard 41, the surrounding obstacles and the electric motor 61 can be prevented from being directly hit and damaged.

  As shown in FIGS. 1 to 4, the hydraulic jack device 10 accommodates the ram piston 13 that fits with the lower surface of the hydraulic jack device support portion 35 that protrudes from the rear upper portion of the control unit 30. A ram cylinder 14, a hydraulic base 15 fixed substantially horizontally to the upper and lower intermediate portions of the ram cylinder 14, a plunger pump 16 that supplies pressure oil to the ram cylinder 14 and is provided on the rear portion of the hydraulic base 15, An oil tank 17 provided on the front portion of the hydraulic base 15 with the cylinder 14 disposed in the center, and a drive rear wheel 63 fixed to the table 40 so as to be pivoted downwardly from the lower surface of the hydraulic base 15 and fixed to the table 40. The rear wheel support member 18 is supported, and the handle base 19 is fixed to the handle unit 70 to operate the plunger pump 16.

  With this configuration, when the handle base 19 is turned up and down, the pressure oil is sent from the plunger pump 16 to the ram cylinder 14 from the oil tank 17 via the hydraulic base 15 and pushes up the ram piston 13. As the ram piston 13 is raised, the hydraulic jack device support portion 35 provided on the loading platform 20 fitted to the upper end of the ram piston 13 is raised, and the arms 22 and 22 are rotated as the rear frame 36 is raised. The front wheel 21 connected to 22 and 22 is lowered, and the loading platform 20 can be lifted. On the other hand, by operating a release lever 72 which will be described later, a valve provided in the hydraulic base 15 is opened, and the pressure oil in the ram cylinder 14 is returned to the oil tank 17, whereby the ram piston 13 is lowered and the loading platform 20 is lowered. Can be lowered.

  As shown in FIGS. 1 and 2, the handle unit 70 includes a grip portion 71, a release lever 72, an operation box 73, and a connection handle pipe 75. The release lever 72 protrudes laterally from the side surface of the operation box 73. Further, the rear surface of the operation box 73 is covered with a lid 77 (see FIG. 5). When the electric traveling pallet truck is used, the electrical box 76 is attached to the rear surface of the lid 77 (see FIG. 1). The operation box 73 is provided at the left and right center of the grip portion 71. A travel switch 74 serving as a travel operation means is provided on the upper surface of the electrical box 76. The travel switch 74 connects the control circuit of the control unit 30 and the electric motor 61 via a wiring (not shown) provided in the connection handle pipe 75. When the travel switch 74 is operated forward, an electric motor (motor) 61, which will be described later, can be driven forward and moved forward, and when operated backward, the electric motor 61 can be rotated backward and moved backward.

  Here, as a matter to be noted, the driving rear wheel 63 is configured to freely rotate when the key switch 37 is OFF. That is, the electric travel pallet truck 100 can be manually traveled when the key switch 37 is OFF, and can be moved without operating the electric motor 61. In other words, even when the battery is discharged, it can be moved manually. In order to improve safety, a brake can be attached to the drive unit 60 (drive rear wheel 63). In this way, in the electric travel pallet truck 100, manual travel can be performed even when the battery runs out or no electric travel is required. That is, the usability of the electric traveling pallet truck 100 can be improved.

  As shown in FIGS. 1 to 4, the drive unit 60 includes an electric motor 61, a reduction gear (not shown), a reduction case 62 that houses the reduction gear, a driving rear wheel 63 that is driven by the electric motor 61 via the reduction gear, and the like. It is configured. These are integrally formed, and a shaft-like connecting portion provided on the upper portion of the speed reduction case 62 is fitted and fixed to the lower portion of the connecting pipe 50, and the upper portion of the connecting pipe 50 is fixed to the rear wheel support member of the hydraulic jack device 10. 18 is fixed by fitting. The rear wheel support member 18 and the connecting pipe 50 are configured to be detachable by pins, bolts, and the like so that the drive unit 60 can be easily removed when the manual travel pallet truck 200 is used.

  By setting it as such a structure, the electric traveling pallet truck 100 can obtain the following raising / lowering actions. That is, by grasping the grip portion 71 of the handle unit 70 and rotating up and down (pumping operation), the plunger pump 16 is operated, the oil in the oil tank 17 is supplied to the ram cylinder 14, and the ram piston 13 is raised. The rear part of the loading platform 20 can be raised. At the same time, the arm 22 rotates about the support shaft 23 as the loading platform 20 rises, protrudes below the front wheel 21 via the rod, and can raise the front end portion of the loading platform 20. In this way, the electric travel pallet truck 100 can raise the loading platform 20 and raise the conveyed object such as a pallet. On the other hand, by operating the release lever 72, the valve can be opened to return the oil in the ram cylinder 14 to the oil tank 17, and the conveyed object such as a pallet can be lowered.

  The electric travel pallet truck 100 can obtain the following travel effects. That is, by operating the travel switch 74, the power from the battery 32 is controlled by the control circuit and supplied to the electric motor 61, and the driving rear wheel 63 is driven by the electric motor 61 to obtain travel. Further, by turning the handle unit 70 left and right, the direction of the drive unit 60, that is, the direction of the drive rear wheel 63 can be changed to change the direction.

  Next, the manual travel pallet truck 200 will be described with reference to FIGS. For easy understanding, the direction of arrow A in FIG. The same members in the electric traveling pallet truck 100 are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIGS. 5 and 6, the manual travel pallet truck 200 is configured by units of a hydraulic jack device 10, a loading platform 20, a rear frame 130, a table 140, and travel wheels 160. As shown in FIG. 6, the manual travel pallet truck 200 is in a final product form by finally assembling the units (devices) 10 to 160.

  The units 10 to 160 will be described in detail below with reference to FIGS. About the hydraulic jack apparatus 10 and the loading platform 20, since it is a common unit with the electric traveling pallet truck 100, description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, the rear frame 130 is formed in a substantially triangular shape when viewed from the front, and a hydraulic jack device support part 135 projects rearward from the upper vertex so as to support the upper end of the ram piston 13. ing. However, the rear frame 130 is formed in a quadrangular shape so as to accommodate the battery 32, the charger 31, the control circuit, and the like, and has the same configuration as the rear frame 36, so that the electric travel pallet truck 100 and the manual travel The pallet truck 200 can be a common part. The rear frame 130 is fixed to the rear end of the loading platform 20. Further, the support shaft 23 is horizontally and horizontally mounted on the lower portions of both sides of the rear frame 130, and the arm 22 is fixed to the support shaft 23 in the same manner as described above. One side of the arm 22 pivotally supports a rod (not shown) connected to the front wheel 21, and the other rear side is pivotally supported by the table 140. On the other hand, a hydraulic jack device support portion 135 is formed at the upper rear end of the rear frame 130 so that the upper end of the ram piston 13 is fitted.

  As shown in FIGS. 5 to 8, the table 140 is formed in a substantially rhombus shape. The table 140 is pivotally supported on both sides by the rear side of the arms 22 and 22. Further, the table 140 is formed with a shaft hole in the vertical direction for inserting and supporting the rear wheel support member 18 at the center of the left and right. With such a configuration, the rear wheel support member 18 projecting downward from the lower portion of the hydraulic base 15 of the hydraulic jack device 10 is inserted into the table 140 and is rotatably supported. Each of the arms 22 and 22 can be rotatably supported.

  As shown in FIGS. 5 to 8, the left and right traveling wheels 160 and 160 are fixed to both sides of the wheel shaft 161. Further, the left and right center of the wheel shaft 161 is pivotally supported by the lower portion of the rear wheel support member 18 of the hydraulic jack device 10.

  With such a configuration, the manual traveling pallet truck 200 can obtain the same lifting and lowering action as the electric traveling pallet truck 100. The manual travel pallet truck 200 can obtain the following travel effects. That is, manual travel can be obtained by pushing and pulling the handle unit 70 back and forth. Moreover, the traveling wheel 160 can be changed in the left-right direction by rotating the handle unit 70 to the left and right.

  The electric traveling pallet truck 100 and the manual traveling pallet truck 200 according to the present embodiment are configured with at least the hydraulic jack device 10 and the loading platform 20 as a common unit. In other words, the drive unit 60 can be attached to and supported by the rear wheel support member 18 and the traveling wheel 160 can be supported at the lower portion of the hydraulic jack device 10. In the present embodiment, the electric travel pallet truck 100 has a connecting pipe 50 interposed between the rear wheel support member 18 and the drive unit 60 in order to adjust the height position of the hydraulic jack device 10. . In this way, the number of parts of the electric traveling pallet truck 100 and the manual traveling pallet truck 200 can be reduced. That is, the parts cost of the pallet trucks 100 and 200 can be reduced, and the number of manufacturing steps can be reduced.

  As described above, when the specification is changed from the manual travel pallet truck 200 to the electric travel pallet truck 100, the hydraulic jack device 10 to which the handle unit 70 is attached is inserted into the table 40 from above and the drive unit 60 is connected to the connection pipe from below. 50 is connected and fixed. Furthermore, it can be changed by attaching the table 40 to the loading platform 20 with the rear frame replaced, attaching the electrical box 76 to the rear surface of the lid 77, and wiring to the control circuit. In this way, the number of changing members is small, and the specification can be easily changed at low cost.

The perspective view which shows the whole structure of the electrically-driven traveling pallet truck which concerns on the Example of this invention. The perspective view which shows the state which isolate | separated each unit similarly. The front view which similarly shows the periphery of a driving rear wheel. Similarly side view. The perspective view which shows the whole structure of the manual travel pallet truck which concerns on another Example of this invention. The perspective view which shows the state which isolate | separated each unit similarly. The front view which similarly shows the circumference of a rear wheel. Similarly side view.

DESCRIPTION OF SYMBOLS 10 Hydraulic jack apparatus 20 Loading platform 30 Control unit 37 Key switch 40 Table 50 Connection pipe 60 Drive unit 63 Drive wheel 100 Electric travel pallet truck 140 Table 160 Travel wheel 200 Manual travel pallet truck

Claims (2)

A loading platform (20) having a rear frame standing upright at the rear of a pair of left and right fork-shaped mounting sections having front wheels that can be moved up and down, and a hydraulic jack device (10) disposed at the rear of the loading platform (20) In the pallet truck comprising a handle unit (70) for raising and lowering the hydraulic jack device (10) and a rear traveling unit provided at a lower portion of the hydraulic jack device (10), the hydraulic jack device (10) A rear traveling unit (80) for an electric traveling pallet truck (100) including a driving rear wheel (63), a deceleration case (62), and an electric motor (61) with respect to the loading platform (20), traveling wheels (160), running portion after the manual driving pallet truck (200) for comprising a table (140) (280) and to be able to configure replacement of the hydraulic jack unit downward from (10), a rear wheel support unit When projecting (18) to constitute the electric traveling pallet truck (100), a bracket (42) configured in a substantially gate shape in rear view, and a guard (41) extending rearward and downward from the bracket (42) The rear wheel support member (18) is inserted and supported in the through hole of a frame-like table (40) provided with a through hole in the vertical direction at the center of the upper surface of the bracket (42). 42), the rear side of the arm (22, 22) connected to the front wheel (21) is pivotally supported on both sides of the front wheel (21), and the rear wheel support member (18) in the frame-like table (40). When the driving rear wheel (63) provided with the electric motor (61) is attached via the connecting pipe (50) to form the manual travel pallet truck (200), the rear wheel support member (18) is Manual pallet truck (200) The table (140) is inserted into a shaft hole formed at the center of the left and right and is rotatably supported. The arms (22, 22) are rotatably supported at both ends of the table (140), and the rear Below the table (140) of the wheel support member (18), a wheel shaft (161) with the left and right traveling wheels (160, 160) fixed on both sides is connected to a shaft hole in the lower part of the rear wheel support member (18). A pallet truck that is fitted to and supported by a shaft . The pallet truck according to claim 1, further comprising a key switch (37) separately from the travel switch (74) for forward and reverse rotation of the electric motor (61) when the electric travel pallet truck (100) is configured. When the key switch (37) is turned off, the driven rear wheel (63) is configured to be freely rotatable, and can be manually moved and moved .