JP5300541B2 - Loading platform lifting device and method for removing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load receiving platform elevating device capable of preventing decrease of a shipping space for a load on a platform when not in use, and a removing method thereof. <P>SOLUTION: A base bracket 3 for supporting, via a support body 7 and an arm body 4, the load receiving platform 2 on which the load is placed is fixed on the platform 11 of a freight car C by a bolt 12 and a nut body 27. When the load receiving platform elevating device 1 is not in use, the load receiving platform elevating device 1 is set in a storage state or a grounding state. Then, the fixture of the base bracket 3 by the bolt 12 and the nut body 27 is canceled, and the base bracket 3 is removed from the platform 11. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a load receiving table lifting device which is attached to a vehicle and used for loading and unloading loads and a method for removing the load receiving table lifting device.

For example, Patent Document 1 discloses a load receiving table lifting device that is attached to a cargo vehicle and used for loading and unloading loads. The load receiving device lifting device includes a base bracket fixed on a load receiving plate of a vehicle, a load receiving table on which a load is placed, a support that supports the load receiving support so as to be able to turn up and down, and a support that supports the support. And an arm that is attached to the base bracket so as to be vertically rotatable, and by vertically rotating the arm, the load receiving platform can be moved up and down between the ground and the cargo platform.
Further, when the vehicle travels without loading / unloading of the load, the load receiving platform is raised on the loading platform, and the load receiving platform is rotated with respect to the support body so as to stand up. Thereby, the load receiving platform lifting device can be stored compactly on the load receiving platform (Patent Document 1).

Japanese Utility Model Publication No. 63-44272 (see FIG. 2)

  However, since such a loading platform lifting device is permanently installed on the loading platform of the vehicle, for example, when loading and unloading a light load manually, even when the loading platform lifting device is not used, the loading platform lifting and lowering device is lifted on the loading platform. The device is in an existing state. For this reason, there has been a problem that the space for loading luggage on the loading platform is reduced.

  Accordingly, the present invention has been made in view of the above-described problems, and a load receiving platform lifting apparatus capable of preventing a load loading space on the loading platform from being reduced when the load receiving platform lifting apparatus is not used, and a method for removing the same. The purpose is to provide.

The load receiving platform lifting apparatus according to the present invention is a load receiving platform lifting apparatus including a device main body mounted on a vehicle loading platform, and the device main body supports a load receiving platform on which a load is placed and the load receiving platform. The arm body is rotated up and down so that it can be moved up and down between a support body, an arm body supporting the support body, and a grounding position where the load receiving platform is grounded to the ground. A base portion that supports the base portion, and includes a fixing means that fixes the base portion on the loading platform and can release the fixing, and the fixing means sets the loading platform to the grounding position. It is arranged at a position where it does not interfere with the apparatus main body in the grounding state, and the apparatus main body is self-supporting on the ground when the fixing by the fixing means is released in the grounding state .

According to the load receiving platform lifting apparatus of the present invention, the base portion of the apparatus body can be fixed and released on the vehicle loading platform by the fixing means, so that the load receiving platform lifting apparatus can be removed from the loading platform when the load receiving platform lifting apparatus is not used. Can be removed. For this reason, it can prevent that the loading space of the load on a loading platform reduces.
Further, since the fixing by the fixing means can be released without interfering with the apparatus main body in the grounded state, the load receiving platform lifting device can be removed while being grounded. For this reason, the operation | work which lowers the removed cradle raising / lowering apparatus to the ground from a cradle becomes unnecessary.
Moreover, since the apparatus main body can be prevented from falling from the grounded state when the fixing by the fixing means is released in the grounded state, the work for removing the load receiving platform lifting device can be performed safely.

According to the load receiving platform lifting apparatus of the present invention, a load receiving platform lifting apparatus including a device main body mounted on a vehicle loading platform, the device main body supporting a load receiving platform on which a load is placed, and the load receiving platform. The arm body is moved up and down so that the arm body can be moved up and down between an upper position above the loading platform and a grounding position for grounding to the ground. A base part rotatably supporting the base part, and a fixing means for fixing the base part on the cargo bed and releasing the fixation, wherein the support body has a horizontal posture. has undulating movably supported between a standing position, the fixing means, characterized in that it is arranged at a position not interfering with the apparatus main body in the storage state in which said standing position by said on position said receiving platform And According to the load receiving platform lifting apparatus of the present invention, since the fixing by the fixing means can be released without interfering with the apparatus main body in the retracted state, the load receiving lift lifting apparatus can be removed in a compact state in which it is stood and stored. . For this reason, the removal work of the load receiving table lifting device can be performed in a space-saving manner.

  Moreover, it is preferable that the apparatus main body is self-supporting on the loading platform when the fixing by the fixing means is released in the storage state. In this case, it is possible to prevent the apparatus main body from falling from above the loading platform when the fixation by the fixing means is released in the retracted state, so that the removal operation of the loading platform lifting device can be performed safely.

  Moreover, it is preferable that the said cargo receiving platform raising / lowering apparatus is further provided with the holding member which can hold | maintain the said apparatus main body in the said grounding state, when the fixation by the said fixing means is cancelled | released in the said grounding state. In this case, since the apparatus main body can be held in the grounded state by the holding member when the fixing by the fixing means is released in the grounded state, the work for removing the load receiving table lifting device can be performed safely.

  The present invention also provides a load receiving platform on which a load is placed, a support body that supports the load receiving table, an arm body that supports the support body, an upper position above the load platform of the vehicle, and a ground surface. A load receiver comprising an apparatus main body having a base portion that supports the arm body so as to be vertically movable so as to be able to move up and down with respect to a grounding position that contacts the ground, and is fixed on the loading platform. A method for removing a platform lifting device from the loading platform, wherein the base is fixed by a fixing means from a retracted state in which the loading platform is in the upright position at the upper position, and the device body is removed from the loading platform. It is characterized by removing. In this case, since the load receiving platform lifting device can be removed from the loading platform when the load receiving platform lifting device is not used, it is possible to prevent a load space for loading on the loading platform from being reduced.

The present invention also provides a load receiving platform on which a load is placed, a support body that supports the load receiving table, an arm body that supports the support body, an upper position above the load platform of the vehicle, and a ground surface. A load receiver comprising an apparatus main body having a base portion that supports the arm body so as to be vertically movable so as to be able to move up and down with respect to a grounding position that contacts the ground, and is fixed on the loading platform. A method of removing a platform lifting device from the loading platform, wherein the loading platform is lowered to the grounding position to be in a grounded state, and in the grounded state, the fixing of the base portion by the fixing means is released , and the apparatus body And the apparatus main body is removed from the cargo bed. In this case, since it can be removed while the load receiving platform lifting device is grounded, it is not necessary to lower the entire removed load receiving platform lifting device from the loading platform to the ground.

The present invention also provides a load receiving platform on which a load is placed, a support body that supports the load receiving table, an arm body that supports the support body, an upper position above the load platform of the vehicle, and a ground surface. The arm body is supported so as to be able to move up and down so that it can be moved up and down with respect to a grounding position where it contacts the ground, and the base portion fixed on the loading platform and the working fluid are supplied and discharged, thereby A lifting / lowering drive mechanism having a fluid actuator for rotating the arm body up and down, and a method of removing a load receiving platform lifting / lowering device having an apparatus main body from the loading platform, wherein the load receiving platform is moved to the grounding position by the fluid actuator. The grounding state is lowered to a grounding state, and an external force is applied in a direction to push the base portion upward with respect to the base portion by the working fluid pressure in the fluid actuator in the grounding state. Is allowed, to release the said base portion by the fixing means in a state in which the action of the external force, characterized in that removing the device body from the said loading platform.
In this case, an external force in the upward direction acts on the base portion due to the working fluid pressure in the fluid actuator in the grounded state. Therefore, when the base portion is fixed by the fixing means in this state, the base portion is Can be floated above. This eliminates the need to lift the base part, which has been released from the fixed state in the grounding state, from the loading platform, so that it is possible to easily remove the loading platform lifting device.

  According to the present invention, since the load receiving device lifting device can be removed from the load carrier when the load receiving device lifting device is not used, it is possible to prevent the load placement space on the load carrier from being reduced.

It is a side view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a side view of a cargo receiving platform raising / lowering apparatus, and has shown the state which has a cargo receiving platform in the middle of raising / lowering. It is a side view of a load receiving table raising / lowering apparatus, and has shown the state which has a load receiving stand in a contact position. It is a side view of a load receiving table raising / lowering apparatus, and has shown the stowed state in which the load receiving stand stands in the upper position. It is a rear view of the load receiving table raising / lowering apparatus of FIG. It is explanatory drawing explaining a hinge part. It is explanatory drawing of the standing lock apparatus for maintaining a load receiving stand with a standing posture. It is explanatory drawing of the horizontal lock apparatus for maintaining a load receiving stand with a horizontal attitude | position. It is a hydraulic circuit diagram of a raising / lowering drive mechanism. It is an electrical wiring diagram between a load receiving table raising / lowering apparatus and a vehicle body side battery. It is a top view which shows the fixing means of a load receiving table raising / lowering apparatus. It is the perspective view which decomposed | disassembled the fixing means of the load receiving table raising / lowering apparatus. It is a side view which shows the state which removed the volt | bolt from the load receiving stand raising / lowering apparatus of the storage state. It is the rear view which looked at FIG. 13 from the vehicle back. It is a rear view which shows the state which suspended the load receiving platform raising / lowering apparatus removed by the storage state with the crane. It is a side view which shows the state which removed the volt | bolt from the load receiving stand raising / lowering apparatus of the grounding state. It is a side view which shows the state which moved the freight vehicle ahead with respect to the load receiving stand raising / lowering apparatus removed in the grounding state. It is a side view which shows the state which folded the support body of the load receiving device raising / lowering apparatus removed in the grounding state on the load receiving stand. It is a side view which shows the state which further folded the arm body on the support body from the state of FIG. It is a side view of the cargo receiving platform raising / lowering apparatus which concerns on other embodiment, and has shown the state which is holding the arm body by the holding member in the grounding state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, FIG. 2, FIG. 3 and FIG. 4 are side views showing an embodiment of the load receiving table lifting device of the present invention. FIG. 5 is a rear view of the load receiving table lifting device in the state shown in FIG. 4. The load receiving platform lifting / lowering device 1 includes a device main body U that is mounted on a load carrier 11 of a cargo vehicle C, and is used for loading and unloading loads between the ground and the load carrier 11. A rear side door (opening / closing door) 10 is provided at the rear end portion of the loading platform 11 so as to stand up when the vehicle is traveling. Further, in FIG. 5, a side door 20 is provided at a side end portion in the vehicle width direction on the loading platform 11 so as to stand in a standing state when the vehicle travels.

  Each of these doors 10 and 20 can be opened and closed by being pivoted in the vertical direction by a hinge provided at the edge of the loading platform 11, and standing up from the edge of the loading platform 11 in a closed state (see FIG. 4). 5), and in the open state, the bag 11 hangs downward from the edge of the loading platform 11 (see FIGS. 1 to 3). The loading platform 11 is provided with a securing portion (not shown) that secures the standing doors 10 and 20 in the standing posture. The lashing portion is operated by the user, and is switched between a lashing state in which the doors 10 and 20 are restrained in a standing posture (closed state) and a release state in which the sashing state is enabled. In FIG. 5, the rear door 10 is in an open state. The doors 10 and 20 are made of a steel plate or the like.

  The apparatus main body U of the load receiving platform lifting / lowering device 1 includes a load receiving platform 2 on which a load is placed. The load receiving platform 2 has a plate-shaped load receiving platform main body 21 having a mounting surface 2a on which a load is placed. Yes. The illustrated apparatus body U is attached to the rear end portion of the upper surface 11a of the loading platform 11, and the loading platform 2 is grounded to the ground above the rear end portion of the loading platform 11 and to the ground behind the vehicle. Move up and down between positions. The vehicle front-rear direction matches the depth direction of the load receiving platform 2 in the state of FIGS. 1 to 3, and the vehicle width direction (the left-right direction of the vehicle C) matches the width direction of the load receiving platform 2.

  In addition to the cargo cradle 2, the apparatus main body U includes a base bracket (base portion) 3 attached to the upper surface 11 a of the cargo cradle 11, a support 7 that supports the cargo cradle 2, a base bracket 3, and a support 7. Are connected to each other, a lift cylinder 5 that expands and contracts, and a power unit 6 that drives the lift cylinder 5. The base bracket 3, the arm body 4, and the support body 7 are provided at the end of one side in the vehicle width direction at the rear part of the loading platform 11 (see FIG. 5). And the goods receiving stand 2 is provided in the position near the center of the vehicle width direction.

  The base bracket 3 is attached to a rear portion of the upper surface 11a of the loading platform 11 so as to be fixed and unfixable by a bolt 12 and a nut body 27 as fixing means. Thereby, the attachment of the apparatus main body U to the freight vehicle C is simple, and a bolt hole may be formed on the freight vehicle C side, and no major modification is required.

  The arm body 4 has a first arm 13 and a second arm 14 and constitutes a parallel link. The first arm 13 is a member extending in one direction from the base bracket 3, the base portion 13 a of the first arm 13 is rotatably attached to the upper portion of the base bracket 3, and the tip portion 13 b is the support 7. It is rotatably attached to the upper part of a (side support frame 7a described later). The second arm 14 is a member extending from the base bracket 3 along the first arm 13, the base portion 14 a of the second arm 14 is rotatably attached to the base bracket 3, and the tip portion 14 b is supported. The body 7 (side support frame 7a) is rotatably attached.

  The arm body 4 swings between a standing position (FIG. 1) extending upward from the base bracket 3 and a rear position (FIG. 3) extending rearward and obliquely downward toward the ground. be able to. With this arm body 4, the support body 7 and the load receiving platform 2 are moved up and down between an upper position (FIG. 1) above the upper surface 11 a of the rear portion of the loading platform 11 and a grounding position (FIG. 3) that contacts the ground behind the vehicle. be able to. Moreover, as shown in FIGS. 1-3, since the arm body 4 comprises the parallel link, it can be raised / lowered with the load receiving stand 2 (load receiving stand main body 21) made into a horizontal attitude | position.

  In FIG. 5, the load receiving platform 2 includes the load receiving platform main body 21 whose surface is a placement surface 2 a on which a load is placed, and a first support member 22 attached to the load receiving platform main body 21. The support member 22 is a member that linearly extends in the width direction of the cargo cradle 2, is fixed to the back side of the cargo cradle body 21, and is further partially outward from the side of the cargo cradle body 21. Is a protruding member. A second support member 23 is provided on the back surface of the cargo receiving body 21. The support member 23 has substantially the same length as the width direction dimension of the cargo receiving table main body 21. In the illustrated form, the support members 22 and 23 are constituted by hollow square pipes and function as beam members (strength members) in the width direction of the load receiving table main body 21.

  The support 7 has a side support frame 7a, and the first support member 22 is attached to the lower part of the side support frame 7a via a hinge portion 8. The side support frame 7a has a vertically long box shape, and houses the arm body 4 and the lift cylinder 5 and opens in front of the vehicle in order to make the arm body 4 and the lift cylinder 5 function.

  FIG. 6 is an explanatory view for explaining the hinge portion 8. The hinge portion 8 is attached to the support 7 so that the load receiving platform 2 can change its posture. The hinge part 8 is rotatable to the first bracket part 8a, the first bracket part 8a fixed to the side support frame 7a, the second bracket part 8b fixed to the support member 22, and the second bracket part 8b. As a hinge shaft 8c. The center line of the hinge shaft 8 c is horizontal and the width direction of the load receiving platform 2. The hinge base 8 allows the load receiving body 21 fixed to the support member 22 to swing up and down around the horizontal axis a with respect to the side support frame 7a. As a result, when the vehicle travels without using the load receiving platform 2 for loading and unloading the load, the load receiving platform main body 21 is in an upright position on the loading platform 11 (see FIGS. 4 and 6A), and the loading and unloading of the load is performed. During operation, the load receiving body 21 can be in a horizontal posture (see FIGS. 1 and 6B).

  In FIG. 1, the first support member 22 is attached to an intermediate portion in the depth direction (vehicle longitudinal direction) of the load receiving table main body 21 in a horizontal posture. In addition, when the load receiving body 21 is in the standing posture (see FIG. 4), it is an intermediate portion in the height direction. And since the said hinge part 8 is attached to this support member 22, the rotation center (horizontal axis a) of the load receiving stand 2 is located in the intermediate part of the depth direction of the load receiving stand main body 21 in side view. To do. With this configuration, a portion of the load receiving body 21 on the front side of the vehicle with respect to the horizontal axis a (a portion on the base end 2b side of the load receiving stand 2) is a posture in which the load receiving stand 2 stands (see FIG. 4). ) Is located below the horizontal axis a. In this way, in order to position a part of the cargo bed main body 21 below the horizontal axis a and above the upper surface 11a of the cargo bed 11, the first support member 22 is installed from the upper surface 11a of the cargo bed 11. The position is set high. Specifically, as shown in FIG. 4, the apparatus main body U is configured such that the support member 22 exists at a height position facing the upper part of the upright door 10.

  And in order to make it the use state (state of FIGS. 1-3) which loads and unloads a load, the load receiving stand 2 is rotated by the hinge part 8, the load receiving stand main body 21 is made into a horizontal posture, and the mounting surface 2a Set to face up. In FIG. 6, a contact portion 9 a and a contacted portion 9 b are provided between the first bracket portion 8 a and the second bracket 8 b of the hinge portion 8 in order to maintain the load receiving table main body 21 in a horizontal posture. In FIG. 6, when the contact portion 9a made of a bolt is provided in the second bracket portion 8b and the load receiving base body 21 is in a horizontal posture, the contact portion 9a (the head of the bolt) is one of the first bracket portions 8a. It abuts on the part (contacted part 9b). This restricts the load receiving table body 21 from rotating too much beyond the horizontal posture.

  Then, as shown in FIG. 4 and FIG. 6 (a), the load receiving platform 2 which is in the upper position on the loading platform 11 and is in a horizontal posture is turned by 90 ° in the hinge portion 8 to stand. The table 2 is in a retracted state folded with respect to the side support frame 7a. In this state, the base end 2b of the load receiving platform 2 is in the lower position, the front end 2c is in the upper position, and the base end 2b and the front end 2c are arranged on the same vertical plane.

  Further, in FIG. 5, the apparatus main body U has a standing lock device 17 for maintaining the load receiving stand 2 in the standing posture. The standing lock device 17 restricts the load receiving platform 2 in the standing posture from rotating in a direction that falls forward and backward. Specifically, as shown in FIG. 7, the standing lock device 17 includes an engagement member 17 a provided on the load receiving platform 2 and an engaged member 17 b provided on the support 7. The side edges of the engaging member 17a and the load receiving platform 2 are inserted between the front plate portion 17b1 and the rear plate portion 17b2 formed integrally with the engaged member 17b, so that the load receiving table 2 is maintained in a standing posture. Is done.

The engaging member 17a is always urged in the engaging direction (the arrow b direction in FIG. 7) by the elastic member (spring) 17c. For this reason, an inclined surface (not shown) formed at the front end of the engaging member 17a comes into contact with the rear plate portion 17b2 of the engaged member 17b immediately before the load receiving platform 2 is rotated upward to assume the standing posture. As a result, the plate member 17b2 is then climbed over while moving in the direction opposite to the engaging direction against the urging force of the elastic member 17c. When the engaging member 17a gets over the engaged member 17b, it is pushed in the engaging direction by the urging force of the elastic member 17c and inserted between the front plate portion 17b1 and the rear plate portion 17b2. That is, the standing lock device 17 is in a locked state in which the load receiving platform 2 is automatically maintained in the standing posture when the load receiving platform 2 is rotated upward to the standing posture. Thereby, when the engaging member 17a contacts the rear plate portion 17b2, it is possible to prevent the load receiving platform 2 in the standing posture from falling forward. In addition, the front surface (mounting surface 2a) of the load receiving platform 2 abuts against the cushion rubber 17b3 fixed to the front plate portion 17b1, so that the load receiving platform 2 can be prevented from falling forward.
Further, the standing lock device 17 has an operating rod 17d that allows the engaging member 17a to be inserted and removed from the engaged member 17b. When the operator operates (pushes and pulls) the operating rod 17d, the locked state and the unlocked state for releasing the locked state can be switched.

  In the load receiving platform lifting / lowering apparatus 1 of the present invention, since the apparatus main body U can be detached from the load carrier 11, the apparatus main body U is provided with a suspension member for hanging the apparatus main body U with a crane or the like. Specifically, in FIG. 7, a suspension member 17 e made of an eyebolt is attached to the upper portion of the engaged member 17 b of the standing lock device 17. That is, the screw hole 17b4 is formed in the upper part of the engaged member 17b, and the suspension member 17e is detachably fixed to the screw hole 17b4. According to this configuration, as shown in FIG. 15, the hook 19a of the crane 19 can be engaged with the suspension member 17e, and the apparatus main body U can be suspended. And since the standing lock device 17 which maintains the load receiving stand 2 in the retracted state is also used as a bracket for attaching the suspension member 17e, the number of parts can be reduced and the manufacturing cost can be reduced.

  Furthermore, in FIG. 5, the apparatus main body U has the horizontal lock apparatus 18 for maintaining the load receiving stand 2 in a horizontal attitude | position. The horizontal lock device 18 restricts the load receiving base body 21 in a horizontal posture from rotating in a direction in which it is in a standing posture. The lock device 18 is operated by an operator, and is switched between a locked state in which the load receiving platform 2 is maintained in a horizontal position and an unlocked state in which the locked state is released. Specifically, as shown in FIG. 8, the horizontal lock device 18 includes an engaging member 18 a provided on the load receiving platform 2 and an engaged member 18 b provided on the support 7. When the engaging member 18a is engaged with the engaged member 18b, the cargo receiving platform 2 is maintained in a horizontal posture.

The engaging member 18a is always urged in the engaging direction (the arrow c direction in FIG. 8) by an elastic member (spring) 18c. Therefore, immediately before the load receiving platform 2 is rotated downward to be in the horizontal posture, the engaging member 18a approaches (moves in the direction of the arrow d in FIG. 8) from below the engaged member 18b, and the engaging member 18a. The inclined surface 18a1 formed at the front end of the member gets over the engaged member 18b while contacting the engaged member 18b. When the engaging member 18a gets over the engaged member 18b, the engaging member 18a is pushed in the engaging direction by the urging force of the elastic member 18c and engaged with the engaged member 18b. That is, the horizontal lock device 18 is in a locked state in which the load receiving platform 2 is automatically maintained in the horizontal posture when the load receiving platform 2 is rotated downward to the horizontal posture. In this state, when the load receiving platform 2 is lowered to the grounding position, the support 7 is also restricted from rotating backward with respect to the load receiving platform 2 at the grounding position around the hinge portion 8. can do.
Further, the horizontal locking device 18 has an operating rod 18d for engaging and disengaging the engaging member 18a with the engaged member 18b (see FIG. 5). The operator can switch between the locked state and the unlocked state in which the locked state is released by operating (pushing and pulling) the operating rod 18d.

1 to 3, the lift cylinder 5 is a double-acting hydraulic cylinder (fluid actuator) that expands and contracts to raise and lower the load receiving table 2, and is attached between the arm body 4 and the support body 7. Yes. One end 5a of the lift cylinder 5 is rotatably attached to the first arm 13, and the other end 5b of the lift cylinder 5 is rotatably attached to the lower part of the side support frame 7a.
The power unit 6 is a hydraulic unit that expands and contracts the lift cylinder 5, and the power unit 6 and the lift cylinder 5 constitute an elevating drive mechanism L that elevates and lowers the load receiving platform 2.

  When the power unit 6 switches the supply of hydraulic oil (working fluid) to the lift cylinder 5, the lift cylinder 5 can perform an expansion / contraction operation. The operation of the power unit 6 is controlled by a control device (not shown) provided in the power unit 6. When the operator operates the operation unit 7e (see FIG. 5) provided on the side support frame 7, the control device causes the power unit 6 to perform a predetermined operation.

  FIG. 9 shows a hydraulic circuit diagram of the lifting drive mechanism L. As shown in FIG. The power unit 6 includes a tank T for storing hydraulic oil, a pump 40 for discharging hydraulic oil, a motor 41 that can rotate forward and reverse, and a switch for supplying hydraulic oil in the tank T to the pump 40. Two check valves (pilot check valves) as regulating means 43 for regulating the discharge of the valve 42 and the hydraulic oil in the head side chamber 5c and the rod side chamber 5d of the lift cylinder 5 to the pump 40 side 43a, 43b, four relief valves 44a to 44d, a throttle valve 45 with a check valve, and an emergency switching valve 46 are integrated, and this power unit 6 is combined with the lift cylinder 5. It is attached to the side support frame 7a.

The switching valve 42 is a three-position electromagnetic valve. When the motor 41 is stopped, as shown in FIG. 9, the biasing forces of the left and right springs 42a and 42b act equally, so that the neutral position 42N Is held in the state.
In this state, when the lift cylinder 5 is extended, the motor 41 is rotated in the forward direction, and the hydraulic oil discharged from the discharge port of the pump 40 (in this case, the left side in FIG. 9) is passed through the check valve 43a. Supply to the side chamber 5c. At this time, the pilot pressure of the hydraulic oil acts on the left position 42L and the check valve 43b of the switching valve 42, whereby the switching valve 42 is switched to the left position 42L and the check valve 43b is opened, so that the hydraulic oil is drawn. 9 is allowed to flow from the upper side to the lower side. As a result, the hydraulic oil in the rod side chamber 5d is supplied to the suction port of the pump 40 (in this case, the right side in FIG. 9) via the check valve 43b, and the hydraulic oil in the tank T is sucked up from the oil passage 47. Then, the air is supplied to the suction port of the pump 40 through the switching valve 42, and the lift cylinder 5 extends.

Further, when the lift cylinder 5 is contracted, the motor 41 is reversely rotated, and the hydraulic oil discharged from the discharge port of the pump 40 (in this case, the right side in FIG. 9) is supplied to the rod side chamber 5d via the check valve 43b. Supply. At this time, when the pilot pressure of the hydraulic oil acts on the right position 42R and the check valve 43a of the switching valve 42, the switching valve 42 is switched to the right position 42R and the check valve 43a is opened, so that the hydraulic oil is drawn. 9 is allowed to flow from the upper side to the lower side. As a result, the hydraulic oil in the head side chamber 5c is supplied to the suction port of the pump 40 (in this case, the left side in FIG. 9) via the check valve 43a, and the hydraulic oil in the tank T is supplied to the oil passage 47 and the switching valve. The lift cylinder 5 is contracted by being supplied to the suction port of the pump 40 through 42.
Further, when the motor 41 is stopped and the driving of the pump 40 is stopped, the pilot pressure of the hydraulic oil does not act on the switching valve 42, and the switching valve 42 is moved to the neutral position 42N by the urging forces of the left and right springs 42a and 42b. Switch. In this state, the hydraulic oil in the side chambers 5c and 5d of the lift cylinder 5 can be restricted from being discharged to the pump 42 side by the check valves 43a and 43b.

  According to this lifting drive mechanism L, when the lift cylinder 5 is contracted by the power unit 6 as described above, the arm 4 rotates upward and the load receiving platform 2 (FIG. 3) that is on the ground together with the support 7. As shown in FIG. 1, the load receiving platform 2 can be raised to the upper position above the loading platform 11 through the state shown in FIG. 2. Then, when the lift cylinder 5 is extended by the power unit 6, the arm body 4 is rotated downward, and the load receiving platform 2 is lowered together with the support body 7 from the upper position to the ground. By this elevating drive mechanism L, an elevating operation for loading and unloading the load placed on the load receiving platform 2 between the ground and the load platform 11 is executed.

  When the driving of the power unit 6 is stopped, the check valves 43a and 43b restrict the hydraulic oil in the head side chamber 5c and the rod side chamber 5d of the lift cylinder 5 from being discharged to the pump 40 side. Thereby, the arm body 4 can be held at an arbitrary rotational position by the hydraulic pressure in each of the side chambers 5c and 5d. Therefore, the check valve 43a, 43b can hold the arm body 4 at the rotation position of each position by stopping the driving of the power unit 6 in the state where the load receiving platform 2 is in the upper position and the ground contact position. It also functions as a rotation holding means.

  And the load receiving stand 2 can be changed to a standing posture (refer FIG. 4) by rotating the load receiving stand 2 in the upper position around the said horizontal axis line a by the hinge part 8. FIG. In this state, the freight vehicle C can run. Further, when the cargo vehicle C is driven, the door 10 is raised and the rear part of the loading platform 11 is closed. In this state, the contact portion 15 fixed to the back surface side of the load receiving platform 2 contacts the upper portion of the standing door 10 so that the base end portion 2b of the load receiving platform 2 in the upright position at the upper position. However, it prevents fluttering due to vibration or the like while the vehicle C is traveling. The abutment portion 15 is made of non-metal such as rubber, resin, wood, etc., and is fixed to four places on the back side of the load receiving platform 2 as shown in FIG. When it gets down to the ground, it also functions as a buffer member that contacts the ground and prevents interference between the load receiving platform 2 and the ground (see FIG. 3).

  FIG. 10 is an electrical wiring diagram between the load receiving table elevating device 1 and the vehicle body side battery B. The first arm 13 or the second arm 14 of the arm body 4 of the apparatus body U is constituted by a hollow pipe member. In FIG. 10, the first arm 13 is a pipe member having a circular cross section. By using the first arm 13 as a pipe member, the power cable Y connecting the battery B mounted on the vehicle C and the power unit 6 of the apparatus body U is passed from the base bracket 3 through the second arm 14 to the side portion. It can be led to the support frame 7a. A hole (not shown) for guiding the cable Y extending from the battery B and passing under the upper surface 11 a to the base bracket 2 and the second arm 14 is provided in a portion of the upper surface 11 a of the loading platform 11 immediately below the base bracket 3. Is formed. The cable Y includes a cable Y1 on the loading platform 2 side and a cable Y2 on the apparatus main body U side, and both the cables Y1 and Y2 are connected to each other by a connecting portion 16 so as to be connectable / disconnectable. For this reason, when removing the apparatus main body U from the loading platform 2, the cable Y1 on the loading platform 2 side and the cable Y2 on the apparatus main body U side can be separated.

  A structure for mounting the apparatus main body U on the loading platform 11 will be described. 11 and 12 are a plan view of the fixing means for fixing the base bracket 3 on the loading platform 11, and a perspective view in which the fixing means is disassembled. On the upper surface 11a of the loading platform 11, a convex portion 11a1 is formed extending in the vehicle front-rear direction. A plurality of the convex portions 11a1 are arranged at intervals in the vehicle width direction. The convex portion 11a1 functions as a reinforcing rib of the loading platform 11, and can mainly resist the bending force of the loading platform 11 in the vehicle front-rear direction.

  The base bracket 3 includes a bracket main body portion 25 to which the base portion of the arm body 4 is attached, and a base portion 26 that fixes the bracket main body portion 25 to the loading platform 11. The base portion 26 is a planar member disposed on a horizontal plane that is placed on the loading platform 11, and the bracket main body portion 25 is a member that rises upward from the base portion 26.

  Specifically, the bracket main body 25 has a pair of side wall portions 25a, a front wall portion 25b, a rear wall portion 25c, and a rib plate 25d that face each other in the width direction. A base portion of the arm body 4 is attached to the side wall portion 25a by a shaft member. The base portion 26 includes front and rear first and second flat plate portions 26a and 26b, and left and right third and fourth flat plate portions 26c and 26d. The front first flat plate portion 26a and the front wall portion 25b are formed by bending a single plate into an L shape (the same applies to other flat plate portions and wall portions). 3 are made of steel, and each member is assembled by welding, and the bracket main body 25 and the base 26 are configured as an integral unit.

  In FIG. 11, the base portion 26 is formed with a plurality of bolt holes 26 e penetrating in the vertical direction (11 pieces in FIG. 11). The number of bolt holes 26e is larger than the number of bolts 12 (four in FIG. 11) necessary to fix the base bracket 3 to the loading platform 11 with sufficient fixing strength. Hereinafter, the number of the bolts 12 is referred to as a required number of bolts. Further, the required number of bolts is preferably 4 or more, and preferably less than the number of bolt holes 26e.

  In FIG. 12, a bolt hole 11 b for penetrating the bolt 12 is formed in the loading platform 11. And the fixing means for fixing the apparatus main body U (base bracket 3) to the loading platform 11 includes the bolt 12 as the first fixing member and the nut body 27 as the second fixing member. The nut body 27 is configured by one nut 27a and three nut plates 27b, 27c, and 27d. The nut plate 27b is long in the vehicle width direction, and a plurality (six in FIG. 12) of screw holes 27b1 for attaching the bolts 12 are formed. The nut plate 27b is disposed below the loading platform 11 and at the rearmost portion of the vehicle. One end of the nut plate 27b (the inner end in the vehicle width direction of the loading platform 11) is attached to the screw hole 27b1 with bolts 12 and attached to the loading platform 11. It is fixed. Similarly, screw holes 27c1 and 27d1 are formed in the other nut plates 27c and 27d.

  In the present embodiment, the nut 27a, the nut plate 27c, and the bolt 12 serve as the first flat plate portion 26a of the base portion 26, and the nut plate 27b and the bolt 12 serve as the second flat plate portion 26b of the base portion 26 as the nut plate 27b. Reinforcing plates 30 which will be described later are fixed to the loading platform 11 by 27d and bolts 12 respectively. Thereby, the apparatus main body U can be attached to the loading platform 11. Even when the bolt 12 that fixes the second flat plate portion 26b and the reinforcing plate 30 is removed from the nut plate 27b when the apparatus body U is removed from the loading platform 11, one end of the nut plate 27b remains as described above. Since it is fixed to the loading platform 11, the nut plate 27b can be prevented from being lost (see FIG. 14).

  According to the configuration of the apparatus main body U, the base bracket 3 is mounted with the load receiving table 2 so as to be movable up and down via the arm body 4, and the load on the load receiving table 2 and the load on the load receiving table 2 are loaded. It is something to support. Therefore, when the load receiving platform 2 is moved up and down, the base bracket 3 is reinforced between the base bracket 3 and the upper surface 11a of the loading platform 11 to prevent the base bracket 3 from falling to the rear of the vehicle (right side in FIG. 11) due to the load. A plate 30 is provided.

The reinforcing plate 30 is a steel plate having a substantially Z-shaped cross section that is longer than the longitudinal length of the base bracket 3 in the longitudinal direction of the vehicle. The lower horizontal portion 30a formed at the lower end of the reinforcing plate 30 is interposed between the third flat plate portion 26c of the base portion 26 and the upper surface 11a of the loading platform 11, and is formed by bolts 12 and nut plates 27b and 27d. It is fixed on the loading platform 11. A hole sufficiently larger than the diameter of the bolt 12 is formed through the lower horizontal portion 30a. A space into which an operator's hand can be inserted is formed between the upper horizontal portion 30 b formed at the upper end of the reinforcing plate 30 and the upper surface 11 a of the loading platform 11, and when removing the apparatus main body U from the loading platform 11. The upper horizontal portion 30b is used as a handle for lifting the apparatus main body U.
As a reinforcing member for preventing the base bracket 3 from falling inward in the vehicle width direction (upper side in FIG. 11) due to the load, the nut plate 27b extending in the vehicle width direction and fixed below the loading platform 11 is provided. , That function is also combined.

  The fixing means includes a plurality of seat plates 28 and a plurality of adjustment plates 29 for fixing the base bracket 3. The seat plate 28 is interposed between the upper surface 11a of the loading platform 11 and the base portion 26. In particular, the seat plate 28 is placed on the flat surface portion of the upper surface 11a where the convex portion 11a1 does not exist, and the bolt 12 And the nut body 27. A hole sufficiently larger than the diameter of the bolt 12 is formed through the seat plate 28 in the thickness direction. Further, the thickness of the seat plate 28 is set to be the same as or smaller than the height of the convex portion 11a1 from the flat surface portion. For this reason, when it is smaller than the above-mentioned dimension, the height of the seat plate 28 is adjusted by the adjustment plate 29. A groove sufficiently larger than the diameter of the bolt 12 is formed in the adjusting plate 29 so as to penetrate in the thickness direction. In FIG. 12, an adjustment plate 29 is attached between the front and rear seat plates 28 and the base portion 26 on the inner side in the vehicle width direction. Accordingly, the base bracket 3 can be firmly tightened between the bolt 12 and the nut body 27 via the seat plate 28 and the adjustment plate 29, and the base bracket 3 can be stably fixed to the load receiving platform 2. Can do.

Each bolt 12 and the nut body 27 are the main body U (base bracket 3, arm body 4, support body 7, elevating / lowering) in the retracted state and the grounded state (FIG. 3) in which the load receiving stand 2 in the horizontal posture is grounded. It is arranged at a position where it does not interfere with the drive mechanism L and the cargo receiving platform 2). In other words, an attachment / detachment space is provided above each bolt 12 so that a tool or an operator's hand can be inserted when attaching / detaching each bolt 12. Thereby, since each bolt 12 and the nut body 27 can be removed without interfering with the apparatus main body U, the apparatus main body U can be removed from the loading platform 11 in the retracted state and the grounded state.
Further, in the retracted state and the grounded state, when the respective bolts 12 are removed from the nut body 27, the respective devices constituting the device body U are set at predetermined positions so that the device body U can stand on the upper surface 11a of the cargo bed 11. The center of gravity G of the apparatus main body U is set (see FIGS. 14 and 17).

Next, a method for removing the apparatus main body U fixed on the loading platform 11 from the loading platform 11 will be described in detail with reference to the drawings for each of the removal from the retracted state and the removal from the grounded state.
First, when removing the apparatus main body U in use from the retracted state, the pump 40 is driven to cause the lift cylinder 5 to contract and raise the load receiving platform 2 to the upper position (see FIG. 1). After the rise, the drive of the pump 40 is stopped and the hydraulic oil in the lift cylinder 5 is restricted from being discharged to the pump 40 side by the check valves 43a and 43b (see FIG. 9).

  From this state, the horizontal lock device 18 is unlocked by manual operation, and the load receiving platform 2 is rotated from the horizontal posture to the standing posture to be in the retracted state (see FIG. 4). At that time, the load receiving platform 2 is automatically locked in a standing posture by the standing lock device 17. Further, the arm body 4 is restricted from rotating with respect to the base bracket 3 by the hydraulic pressure in the lift cylinder 5 and is held at the rotating position in the retracted state.

Next, as shown in FIG. 13, the connection portion 16 of the power cable Y is disconnected, and the connection end portion of the cable Y <b> 2 on the apparatus body U side is pulled out onto the loading platform 11. And each bolt 12 is removed from the nut 27a and nut plate 27b-27d, and fixation of the base bracket 3 with respect to the loading platform 11 is cancelled | released. At that time, since a detachable space is provided above each bolt 12, each bolt 12 can be pulled out above the loading platform 11 without interfering with the apparatus main body U.
Then, as shown in FIG. 14, the apparatus main body U is slightly inclined toward the starboard side of the vehicle C due to the weight of the load receiving platform 2, and the lower right corner of the load receiving platform 2 is in contact with the upper surface 11 a of the loading platform 11. It becomes. Thereby, the apparatus main body U is hold | maintained in the state which became independent on the loading platform 11. FIG.

  In this self-supporting state, as shown in FIG. 7, the suspension member 17e is attached to the support 7 side (the engaged member 17b). Then, as shown in FIG. 15, the hook 19 a of the crane 19 is engaged with the suspension member 17 e, and the apparatus body U is suspended by the crane 19 and lowered from the loading platform 11 to the ground. Thereby, the removal work of the apparatus main body U in the storage state is completed.

In addition, although the operation | work which engages the crane 19 with the support body 7 side is performed after the fixed release of the base bracket 3, you may perform it before the fixed release of the base bracket 3. FIG. In this case, even if an external force acts on the apparatus main body U held in the retracted state after the release of the fixation, the apparatus main body U can be prevented from falling down, and the removal operation can be performed safely.
Moreover, although the apparatus main body U is lowered to the ground by the crane 19, it can also be lowered manually. In this case, since the upper horizontal portion 30b of the reinforcing plate 30 can be used as a handle, the apparatus main body U can be easily lifted.

  Next, the case where the apparatus main body U in the retracted state is removed from the ground state will be described. First, the door 10 is opened, and the standing lock device 17 is unlocked by manual operation, and the load receiving platform 2 in the standing posture is rotated to a horizontal posture by manual operation (see FIG. 1). At that time, the cargo receiving platform 2 is automatically locked in a horizontal posture by the horizontal lock device 18. From this state, when the pump 40 is driven and the lift cylinder 5 is extended, the load receiving platform 2 is lowered while maintaining the horizontal posture.

  When the load receiving platform 2 moves to the ground contact position (see FIG. 3), the lift cylinder 5 is further extended. At this time, since the load receiving platform 2 is in contact with the ground, it does not lower any more, but the base of the arm body 4 tends to rotate upward about its tip by the hydraulic pressure in the lift cylinder 5. For this reason, an external force acts on the base bracket 3 connected to the base of the arm body 4 in the direction of pushing upward. After the external force is applied in this way, the drive of the pump 40 is stopped and the hydraulic oil in the lift cylinder 5 is restricted from being discharged to the pump 40 side by the check valves 43a and 43b (see FIG. 9). . As a result, the arm body 4 is restricted from rotating relative to the support body 7 by the hydraulic pressure in the lift cylinder 5 and is held at the rotating position in the grounded state.

Next, as shown in FIG. 16, the connection portion 16 of the power cable Y is disconnected, and the connection end portion of the cable Y <b> 2 on the apparatus body U side is pulled out onto the loading platform 11. And each bolt 12 is removed from the nut 27a and nut plate 27b-27d, and fixation of the base bracket 3 with respect to the loading platform 11 is cancelled | released. At this time, since a detachable space is provided above each bolt 12, each bolt 12 can be pulled out above the loading platform 11 without interfering with the apparatus body U such as the arm body 4.
Then, as shown in FIG. 17, since the external force that pushes upward by the hydraulic pressure in the lift cylinder 5 acts on the base bracket 3 as described above, the lift bracket 5 is slightly extended, so that the base bracket 3 Is slightly lifted upward from the upper surface 11 a of the loading platform 11. In this state, since the apparatus main body U is in a self-supporting state in the grounded state, the load receiving platform 2 is held in a stable state without falling in the vehicle front-rear direction and the vehicle width direction. Therefore, the apparatus main body U can be removed from the loading platform 11 by moving the vehicle C forward from this state.

  The apparatus main body U removed in the grounded state can be folded compactly in order to facilitate its carrying. The procedure will be described in detail below. First, the support body 7 is folded on the load receiving stand 2 in the ground contact position of FIG. Specifically, the horizontal locking device 18 in the locked state is switched to the unlocked state by manually operating the operating rod 18d (see FIGS. 5 and 8). Then, since the support body 7 can rotate with respect to the load receiving platform 2 around the hinge portion 8, as shown in FIG. 18, the support body 7 together with the arm body 4 and the base bracket 3 is moved backward ( It is rotated in the direction of the arrow e in FIG. At that time, if a sleeper (not shown) is arranged between the cargo receiving platform 2 and the ground, the rotating operation can be easily performed.

  Further, from this state, the arm body 4 is folded on the support body 7. Specifically, the cable Y2 on the apparatus body U side is temporarily reconnected to the battery B via the cable Y1 on the loading platform 2 side or directly, or temporarily connected to an external power source such as a commercial power source, and the lift The cylinder 5 is contracted. Then, as shown in FIG. 19, the base portion of the arm body 4 is rotated forward (in the direction of arrow f in FIG. 19) with the base bracket 3 around the tip portion, and is folded on the support body 7. It becomes. Thereby, since the apparatus main body U will be in the same compact state as the storage state of FIG. 4, it can be carried easily. In addition, when the removal space of the apparatus main body U is wide, the folding operation | work of the apparatus main body U is unnecessary.

  As described above, according to the load receiving platform lifting / lowering device 1 according to the embodiment of the present invention, the base bracket 3 of the device main body U can be fixed and unfixed on the load carrier 11 of the cargo vehicle C by the bolt 12 and the nut body 27. Therefore, the load receiving platform lifting / lowering device 1 can be removed from the loading platform 11 when the load receiving platform lifting / lowering device 1 is not used. For this reason, it can prevent that the loading space of the load on the loading platform 11 decreases. This is particularly effective when the cargo vehicle C is a light truck with a relatively small loading space on the loading platform 11.

Moreover, since the volt | bolt 12 can be removed from the nut body 27 without interfering with the apparatus main body U in the said stored state, the load receiving platform raising / lowering apparatus 1 can be removed in a compact stored state. For this reason, the removal operation | work of the load receiving table raising / lowering apparatus 1 can be performed in space saving.
Further, when the bolt 12 is removed from the nut body 27 in the retracted state, the apparatus main body U is self-supporting on the loading platform 11, so that the loading platform lifting device 1 falls from the loading platform 11 when the bolt 12 is removed. Can be prevented. For this reason, the removal operation | work of the load receiving table raising / lowering apparatus 1 can be performed safely.

Moreover, since the volt | bolt 12 can remove the volt | bolt 12 from the nut body 27, without interfering with the apparatus main body U in the said grounding state, the load receiving platform raising / lowering apparatus 1 can be removed in a grounding state. For this reason, the operation | work which drops the whole load receiving stand raising / lowering apparatus 1 from the loading platform 11 on the ground becomes unnecessary.
In addition, when the bolt 12 is removed from the nut body 27 in the grounded state, the apparatus main body U is self-supporting on the ground, so that when the bolt 12 is removed, the load receiving platform lifting / lowering device 1 is prevented from falling from the grounded state. be able to. For this reason, the removal operation | work of the load receiving table raising / lowering apparatus 1 can be performed safely.

  In addition, an external force is applied to the base bracket 3 fixed to the loading platform 11 in the grounding state in the direction of pushing upward by the hydraulic pressure in the lift cylinder 5, so that the base bracket 3 is formed by the bolt 12 and the nut body 27. When the fixation is released, the base bracket 3 can be held in a state of being slightly lifted above the loading platform 11. Therefore, since the operation | work which lifts the base bracket 3 which was cancelled | released from the loading platform 11 becomes unnecessary, the removal operation | work of the loading platform raising / lowering apparatus 1 can be performed easily.

FIG. 20 is a side view of a load receiving table lifting apparatus according to another embodiment of the present invention. Hereinafter, this embodiment will be described in detail. In addition, in this embodiment, what has the same configuration as that of the above embodiment is indicated by the same reference numeral as that of the above embodiment.
The load receiving table lifting device 50 includes a holding member 51 that holds the device body U of the load receiving table lifting device 50 in the grounded state when the base bracket 3 is removed from the load carrier 11 in the grounded state. The holding member 51 includes a pair of front and rear leg portions 52, a support portion 53 that supports the arm body 4 of the apparatus main body U from below, and a connecting portion 54 that connects the both leg portions 52 and the support portion 53. Yes. Each leg portion 52 is formed to be long in the vertical direction, and its upper end portion is rotatably connected to each other by a rotating shaft 54 a provided in the connecting portion 54. In addition, each leg portion 52 has a screw member 52a extending in the horizontal direction rotatably connected to an intermediate portion thereof, and an operation lever 52b is attached to an end portion of the screw member 52a. By rotating the operation lever 52b, both the leg portions 52 can be rotated about the rotation shaft 54a, and the rotation angle θ between the both leg portions 52 can be adjusted.

  The support portion 53 is formed of a U-shaped channel material having an opening (not shown) on the upper side, and is fixed to the connecting portion 54. The support portion 53 is configured to support a substantially central portion in the longitudinal direction of the second arm 14 from below in the grounding state. Moreover, the vertical height of the support portion 53 can be adjusted by changing the rotation angle θ by the operation lever 52b.

  Next, a method for removing the apparatus body U in the grounded state from the loading platform 11 will be described with reference to FIG. First, similarly to the embodiment, the cargo receiving platform 2 is lowered to the ground contact position. From this state, the holding member 51 is disposed below a substantially central portion in the longitudinal direction of the second arm 14. At that time, the operating lever 52b is manually operated to increase the rotation angle θ of both the leg portions 52 so that the support portion 53 of the holding member 51 does not interfere with the second arm 14, and the height of the support portion 53 is reduced in advance. Keep it.

  Next, the operation lever 52b is manually rotated, the rotation angle θ is decreased, the support member 53 is moved upward, and the second arm 14 at the rotation position in the grounding state is contacted from below to support. To do. From this state, similarly to the above-described embodiment, the connection portion 16 of the power cable Y is disconnected, and the connection end portion of the cable Y2 on the apparatus body U side is pulled out onto the loading platform 11. Then, each bolt 12 is removed from the nut 27a and the nut plates 27b to 27d, and the base bracket 3 is fixed to the loading platform 11 (see FIG. 16). At that time, since the apparatus main body U is held in a grounded state by the holding member 51, it is held in a stable state (grounded state) without falling forward.

  Therefore, the loading apparatus body U can be removed from the loading platform 11 by moving the vehicle C forward from this state. After that, by folding the support body 7 and the arm body 4 on the load receiving platform 2 in the same manner as in the above embodiment, the holding member 51 becomes unnecessary, so that the apparatus main body U becomes compact and easy to carry. It can be carried out. In this embodiment, the holding member 51 supports the second arm 14 of the arm body 4, but may support the first arm 13.

  As described above, according to this embodiment, since the arm body 4 of the apparatus main body U is held by the holding member 51 when the bolt 12 is removed from the nut body 27 in the grounded state, an external force is applied to the apparatus main body U. Even if it acts, it is possible to prevent the apparatus main body U from falling forward from the grounded state. This is also effective when the apparatus body U does not stand by itself in a grounded state, or when the arm body 4 cannot be held at the rotating position in the grounded state.

In addition, the load receiving platform lifting / lowering device of the present invention is not limited to the above-described embodiments, and may have other forms within the scope of the present invention. For example, in each embodiment, the bolt 12 is disposed on the loading platform 11 and the nut body 27 is disposed below the loading platform 11. However, both may be disposed upside down. Further, as the fixing means, the bolt 12 and the nut body 27 are used, but other fixing structures may be used as long as the base bracket 3 can be fixed and released.
In addition, the apparatus main body U is self-supporting in both the retracted state and the grounded state, but may be self-supporting in either state.

Further, in each of the above embodiments, the check valves 43a and 43b including pilot check valves are used as the restricting means 43 that restricts the hydraulic oil in the lift cylinder 5 from being discharged. It is also possible to use a check valve or a switching valve capable of connecting / disconnecting the flow of hydraulic oil.
In each of the above embodiments, the case has been described in which the load receiving platform lifting / lowering device 1 (50) is installed at the rear left end of the load loading platform 11 and the load receiving platform 2 is lowered to the rear of the vehicle. For example, you may attach the load receiving device raising / lowering apparatus 1 so that the load receiving stand 2 may descend to the side of a vehicle.
In each of the above embodiments, the cylinder 5 is attached between the arm body 4 and the support body 7, but it is also possible to attach it between the base bracket 3 and the arm body 4.

1,50 Loading platform lifting device 2 Loading platform 3 Base section 4 Arm body 5 Lift cylinder (fluid actuator)
7 Support 11 Loading platform 12 Bolt (fixing means)
27 Nut body (fixing means)
51 Holding member C Cargo vehicle (vehicle)
L Lifting drive mechanism U Device body

Claims (7)

A load receiving platform lifting device having a device main body mounted on a vehicle loading platform,
The apparatus main body includes a load receiving platform on which a load is placed, a support body that supports the load receiving table, an arm body that supports the support body, and the load receiving table that is grounded to an upper position above the loading platform and to the ground. A base portion that supports the arm body so as to be able to move up and down so as to be able to move up and down with respect to the grounding position.
A fixing means for fixing the base portion on the loading platform and capable of releasing the fixing ;
The fixing means is disposed at a position that does not interfere with the apparatus main body in a grounding state in which the load receiving table is the grounding position,
The load receiving device elevating device , wherein the device main body is self-supporting on the ground when the fixing by the fixing means is released in the grounded state . A load receiving platform lifting device having a device main body mounted on a vehicle loading platform,
The apparatus main body includes a load receiving platform on which a load is placed, a support body that supports the load receiving table, an arm body that supports the support body, and the load receiving table that is grounded to an upper position above the loading platform and to the ground. A base portion that supports the arm body so as to be able to move up and down so as to be able to move up and down with respect to the grounding position.
A fixing means for fixing the base portion on the loading platform and capable of releasing the fixing;
The support body supports the load receiving table so that it can rise and fall between a horizontal posture and a standing posture,
It said securing means receiving platform lifting device, characterized in that disposed in a position that does not interfere with the apparatus main body in the storage state in which said standing position by the on position the receiving platform.   The load receiving platform elevating device according to claim 2, wherein the device main body self-supports on the loading platform when the fixing by the fixing means is released in the stored state. The load receiving table lifting device according to claim 1 , further comprising a holding member capable of holding the device main body in the grounded state when the fixing by the fixing unit is released in the grounded state . A load receiving platform on which a load is placed; a support that supports the load receiving platform; an arm that supports the support; an upper position above the loading platform of the vehicle; and a grounding position that contacts the ground. A load receiving platform lifting device including a device main body having a base portion that supports the arm body so as to be capable of moving up and down between the base body and is fixed on the loading platform. It is a method of removing from the top,
Releasing the fixing of the base portion by the fixing means from the retracted state in which the load receiving stand is in the upright position at the upper position;
Remove the device body from the loading platform
A method for removing the cargo receiving platform lifting device . A load receiving platform on which a load is placed; a support that supports the load receiving platform; an arm that supports the support; an upper position above the loading platform of the vehicle; and a grounding position that contacts the ground. A load receiving platform lifting device including a device main body having a base portion that supports the arm body so as to be capable of moving up and down between the base body and is fixed on the loading platform. It is a method of removing from the top,
Lower the load receiving table to the grounding position to be in a grounded state,
By releasing the fixing of the base portion by the fixing means in the grounding state, the device main body is in a state of being self-supporting on the ground ,
Remove the device body from the loading platform
A method for removing the cargo receiving platform lifting device . A load receiving platform on which a load is placed; a support that supports the load receiving platform; an arm that supports the support; an upper position above the loading platform of the vehicle; and a grounding position that contacts the ground. The arm body is supported so as to be vertically movable so that it can be moved up and down, and the arm body is vertically rotated by supplying and discharging a working fluid, and a base portion fixed on the loading platform. A lifting drive mechanism having a fluid actuator to be removed, and a method of removing a loading platform lifting device including a device main body from the loading platform,
The load receiving table is lowered to the grounding position by the fluid actuator to be in a grounding state,
Due to the working fluid pressure in the fluid actuator in the grounding state, an external force is applied to the base portion in a direction to push the base portion upward,
Releasing the fixing of the base by the fixing means in a state where the external force is applied;
The method of removing the loading platform lifting device, wherein the device main body is removed from the loading platform.

Images