JP7168409B2 - mobile lift - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile lift in which a load-receiving platform is provided on a body frame with wheels so that it can be moved up and down.

As this type of mobile lift, a mobile vehicle body having a fork that moves up and down, that is, a forklift is widely known (for example, Patent Document 1 below).

JP-A-8-12285

The mobile lift disclosed in Patent Literature 1 has a structure in which a fork is driven up and down, and is limited to loading and unloading cargo using pallets.

On the other hand, although there is known a loading platform lifting device mounted on a truck, it is necessary to mount the loading platform lifting device on the truck in advance.

There is a demand for a device that efficiently performs cargo handling work between a cargo vehicle that is not equipped with a cargo receiving platform lifting device and the ground, and cargo handling work between a cargo vehicle loading platform and a warehouse platform that is different in height.

SUMMARY OF THE INVENTION The present invention has been made in recognition of this situation, and its object is to provide a mobile lift that can be used for a variety of cargo handling operations.

One aspect of the invention is a mobile lift. This mobile lift comprises: a body frame having a pair of guide posts and a lateral frame portion disposed between the pair of guide posts;
wheels for movably supporting the body frame;
a runner provided on each of the pair of guide posts so as to be movable up and down;
a receiving platform fixed to the lower part of the runner;
a lifting drive mechanism for lifting and lowering the runner and the load receiving platform;
a caster stopper rotatably provided on the front edge side of the load receiving platform;
a bridge plate rotatably provided on the trailing edge side of the load receiving platform;
and a guide mechanism for erecting the bridge plate,
The guide mechanism is characterized in that it raises the spread plate in the unfolded state while the load receiving table is descending from a predetermined raised position.

The caster stopper preferably has a rear edge protruding from the upper surface of the load receiving board due to its own weight when the load receiving board is not on the ground.

The guide mechanism preferably has a roller attached to a side portion of the bridge plate, and a guide member fixed to the guide post and in contact with the roller.

The elevating drive mechanism includes an elevating cylinder, a movable sheave and a fixed sheave whose mutual distance changes due to expansion and contraction of the elevating cylinder, and a wire wound between both sheaves,
The elevating cylinder, the movable sheave and the fixed sheave are arranged in the lateral frame,
It is preferable that one end of the wire is connected to the runner and the other end is fixed inside the horizontal frame portion.

Any combination of the above constituent elements, and conversion of expressions of the present invention between methods and systems are also effective as embodiments of the present invention.

According to the mobile lift according to the present invention, the main body frame is movably supported by wheels, and the load receiving base provided with caster stoppers and bridge plates on the front and rear sides can be moved up and down. It is possible.

The left view which shows embodiment of the mobile lift which concerns on this invention. Same front view. Same plan view. The left side view which shows the raising/lowering drive mechanism which raises/lowers the runner with which a load-receiving stand is attached in embodiment. The right side view of the same. The front view which similarly shows a raising/lowering drive mechanism. VII-VII plan sectional view of FIG. 4 showing the guide post and runner in the embodiment. The side view explaining automatic standing-up operation|movement of the bridge board in embodiment. FIG. 4A is a front view and FIG. 4B is a side view of a lock mechanism for holding a bridge plate in an upright state in an embodiment;

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. The same or equivalent constituent elements, members, processes, etc. shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. Moreover, the embodiments are illustrative rather than limiting the invention, and not all features and combinations thereof described in the embodiments are necessarily essential to the invention.

1 to 6, the mobile lift 1 includes a body frame 10 having casters 5 as wheels attached to the bottom, a runner 30 provided on the body frame 10 so as to be able to move up and down, and a runner 30 fixed to the runner 30 in a horizontal state. and a load receiving table 50 which can be freely raised and lowered.

The body frame 10 includes a bottom frame portion 11, a pair of guide posts 15 vertically erected and fixed on both left and right sides of the bottom frame portion 11, a horizontal frame portion 12 disposed between the pair of guide posts 15, and a rear surface. a guard 13; The rear guard 13 communicates between the pair of guide posts 15 and extends downward from the inner surface of the lateral frame portion 12 . Between the bottom frame portion 11 and the guide post 15, a side frame portion 14 is fixed which also serves as reinforcement. The bottom frame portion 11 is U-shaped so that the load receiving table 50 can land thereon. There are four casters 5 in total, and two of them on the front side or the rear side can be changed in direction. Also, in order to stop the body frame 10, two casters 5 on the front side and rear side are equipped with a stopping mechanism.

As shown in FIG. 7, the guide post 15 is formed by integrating a hollow square tubular guide portion 16 and a hollow square tubular column portion 17 in parallel. A vertical slit 16 a for guiding the runner 30 up and down is formed in the front wall of the guide portion 16 . A roller 31 is rotatably attached to the portion of the runner 30 that is inside the guide portion 16 . The roller 31 rolls on the inner surface of the guide portion 16 so that the runner 30 can move up and down smoothly with respect to the guide portion 16 .

The runner 30 extends through the vertical slit 16a to the outside of the guide portion 16, and a load receiving table 50 is horizontally fixed to the lower portion of the portion extending outside. In other words, the load receiving platform 50 is fixed to the runner 30 so as to take a vertical posture with respect to the guide post 15 . Side guards 51 are fixed to both side surfaces of the load-receiving table 50 to prevent the load from falling and to reinforce the load. The lower end of the side guard 51 is fixed to the side surface near the front end of the load receiving platform 50 , and the rear end of the side guard 51 is fixed to the upper end of the runner 30 . Double front doors 52A and 52B are attached to side guards 51 on both left and right sides with hinges so as to be freely opened and closed. The front doors 52A and 52B can be locked in a closed state by a door lock mechanism 53. As shown in FIG.

A caster stopper 60 is rotatably connected to the front edge of the load receiving table 50 with a pin 61 . In the non-landing position where the load receiving platform 50 is lifted from the ground, the caster stopper 60 abuts the upper end of the caster stopper 60 on the load receiving platform 50 side regulating member 50a (provided at the side end of the load receiving platform 50) due to its own weight. , and the trailing edge protrudes from the upper surface of the load receiving table 50 . Therefore, the rear edge of the caster stopper 60 protrudes from the upper surface of the load receiving platform 50 from the position where the load receiving platform 50 is slightly raised from the ground to the upper limit position P in FIG. can be prevented. Since the caster stopper 60 forms an upper surface that is continuous with the load receiving table 50 when the load receiving table 50 is on the ground, it is possible to easily carry a truck or the like onto the load receiving table 50 .

Brackets 54 are erected and fixed on both sides of the upper surface of the rear edge portion of the load receiving table 50 . The bridge plate 70 integrally has a small arm 71 , which is rotatably connected to the bracket 54 with a pin 72 . As a result, the bridge plate 70 is biased by its own weight so as to rotate in the unfolding direction so as to be substantially flush with the load receiving platform 50 . When the bridge plate 70 is horizontally deployed as shown in the position Q in FIG. will be handed over. As a result, cargo handling using a trolley or the like can be performed smoothly.

As shown in FIG. 8, a guide mechanism 75 is provided to automatically raise the bridge plate 70 while the load receiving platform 50 is descending from the upper limit position P toward the landing position (that is, lower limit position). The guide mechanism 75 is a roller 76 pivotally supported by the bridge plate 70 so as to protrude from one side surface of the bridge plate 70 (details are omitted, but it is rotatably attached to a reinforcing frame below the bridge plate 70). ) and a guide member 77 with which the roller 76 abuts. The guide member 77 has an inverted L shape with rounded corners and is fixed to the inner side surface of the guide post 15 (the surface where the left and right guide posts 15 face each other). As the load receiving table 50 descends, the roller 76 comes into contact with the contact surface (upper surface) of the guide member 77, and as the load receiving table 50 descends, the bridge plate 70 rotates to the right in FIG. That is, the bridge plate 70 is rotated in the standing direction, and thereafter the bridge plate 70 can be lowered to the landing position in the standing state along the rear guard 13 on the guide post 15 side.

As shown in FIGS. 2 and 9(A) and (B), a bridge plate lock mechanism 55 is provided to lock the bridge plate 70 vertically with respect to the upper surface of the load receiving platform 50 . The bridge plate locking mechanism 55 has a bracket 56 and a spring pin 57 provided on the side guard 51 side, and an engagement member 59 fixed to the bridge plate 70 side. A bracket 56 is fixed to the side guard 51 and a spring pin 57 passes through the bracket 56 . The spring pin 57 is biased (downward) by a compression spring 58 to be fitted into the engagement hole 59 a of the engagement member 59 . After pulling up the ring-shaped operation part 57a on the upper part of the spring pin 57 and aligning the lower end of the spring pin 57 with the engaging hole 59a, the spring pin 57 is released and the lower end of the spring pin 57 is inserted into the engaging hole 59a. By engaging them, the bridge plate 70 can be locked in a vertically erected state. Also, the lock can be released by pulling up the ring-shaped operating portion 57a to disengage the lower end portion of the spring pin 57 from the engagement hole 59a.

One end of a lifting strap 79 is fixed to the upper surface of the bridge plate 70 . By manually pulling the lifting strap 79, the bridge board 70 can be erected at an arbitrary height position on the load receiving platform 50. - 特許庁At this time, the spring pin 57 of the bridge plate locking mechanism 55 hits the engagement member 59 , so that the rotation range of the bridge plate 70 is limited to the range in which the bridge plate 70 stands upright from the unfolded state to the load receiving tray 50 .

4 to 7, the lift driving mechanism 80 for lifting and lowering the runner 30 moving up and down in the guide portion 16 of the guide post 15 and the load receiving base 50 moving integrally therewith will be described. The lift drive mechanism 80 includes a pair of a movable sheave group 81 and a fixed sheave group 82 (see FIG. 6) whose mutual distance changes according to the expansion and contraction of the hydraulic cylinder 90 for lifting, other fixed sheaves 83, 84, and 85, and the left It has a wire 95A whose one end is connected and fixed to the runner 30 and a wire 95B whose one end is connected and fixed to the runner 30 on the right side. The movable sheave group 81 has a plurality of movable sheaves rotatably attached to brackets 86 . The bracket 86 is provided in the lateral frame portion 12 so as to be slidable relative to the lateral frame portion 12 , and the bracket 86 is connected and fixed to the tip portion of the piston rod 91 of the cylinder 90 . The fixed sheave group 82 has a structure in which a plurality of fixed sheaves are rotatably supported (attached) at a fixed position on the left end of the horizontal frame portion 12 . A fixed sheave 83 is rotatably supported (attached) at a fixed position of the right end portion within the lateral frame portion 12 , a fixed sheave 84 is mounted at an upper fixed position within the right guide post 15 , and an upper portion within the left guide post 15 . Fixed sheaves 85 are rotatably supported (attached) at fixed positions.

A wire 95A whose one end is connected and fixed to the left runner 30 includes a fixed sheave 85 in the upper part of the left guide post 15, one fixed sheave in the fixed sheave group 82 in the left end part in the lateral frame part 12, and a movable sheave group 81. , and is wound a plurality of times between each sheave of the movable sheave group 81 and the fixed sheave group 82, and engaged with a wire fixture (hook) 87A attached and fixed to the inside of the lateral frame portion 12. Stopped, fixed.

The wire 95B, one end of which is connected and fixed to the right runner 30, includes a fixed sheave 84 at the upper part of the right guide post 15, a fixed sheave 83 at the right end in the lateral frame portion 12, and a fixed sheave group 82 at the left end in the lateral frame portion 12. one fixed sheave in the movable sheave group 81 and one movable sheave in the movable sheave group 81. It is locked and fixed to the fixed wire fixture (hook) 87B.

A power unit 45 that serves as a hydraulic source for the battery 40 and the lifting hydraulic cylinder 90 is mounted on the mounting table 11 b of the bottom frame portion 11 positioned below the lateral frame portion 12 . The power unit 45 has a motor-pump set 46 that operates using the battery 40 as a power source, an oil tank 47, and the like. A control panel 48 is arranged on the side surface of the guide post 15 to control the operation of the mobile lift 1, that is, to control the operation of the lifting hydraulic cylinder 90. As shown in FIG.

In the configuration of the above embodiment, when the hydraulic oil of the lifting hydraulic cylinder 90 has returned to the oil tank 47 of the power unit 45, the piston rod 91 of the lifting hydraulic cylinder 90 is in the retracted state, and the lifting drive mechanism 80 The distance between the movable sheave group 81 and the fixed sheave group 82 is the narrowest, and the length of the wires 95A and 95B paid out is also the longest. At this time, the runner 30 is at the lowest position, and the load receiving platform 50 is at the landing position (lower limit position) shown in FIG.

When the power unit 45 is operated via the control panel 48 to supply hydraulic oil to the lifting hydraulic cylinder 90, the piston rod 91 of the lifting hydraulic cylinder 90 extends, and the gap between the movable sheave group 81 and the fixed sheave group 82 is increased. becomes longer. As a result, the wire lengths of the wires 95A and 95B are reduced, and the runner 30 is pulled up. Then, it is possible to raise the runner 30 and the load receiving platform 50 to the upper limit position P in FIG. In addition, it is possible to stop at an arbitrary height before the upper limit position P according to the height of the other party to which the cargo is to be transferred.

At this time, if the bridge plate 70 is locked in the upright state by the bridge plate locking mechanism 55, the bridge plate 70 can be raised to the lift limit position P together with the load receiving table 50 while maintaining the upright state. Then, the bridge plate locking mechanism 55 is unlocked at the ascending limit position P or any stop position just before it, and the bridge plate 70 can be deployed horizontally. By releasing the lock, the bridge plate 70 is deployed by its own weight.

On the other hand, when the bridge board 70 is not locked by the bridge board lock mechanism 55, the upright state along the rear guard 13 on the side of the body frame 10 is maintained from the landing position of the load receiving platform 50 to the raised position on the way, and thereafter, as shown in FIG. The rollers 76 are guided in contact with the guide member 77 of the guide mechanism 75, and the bridge plate 70 is horizontally deployed as the load receiving platform 50 is raised.

When the hydraulic oil of the lifting hydraulic cylinder 90 is gradually returned to the oil tank 47 of the power unit 45 via the control panel 48, the piston rod 91 of the hydraulic cylinder 90 is contracted, and the movable sheave group 81 and the fixed sheave group 82 are moved. becomes narrower, and the length of the wires 95A and 95B paid out becomes longer. The runner 30 is at the lowest position, and the load receiving platform 50 is at the landing position (lower limit position) of FIG. It is also possible to stop the load receiving table 50 at a position higher than the landing position according to cargo handling conditions by stopping the return of hydraulic oil in the middle.

When the bridge board 70 is not locked by the bridge board lock mechanism 55, the roller 76 of the guide mechanism 75 in FIG. descends, the bridge plate 70 rotates to the right in FIG. That is, the bridge plate 70 is rotated in the standing direction, and thereafter the bridge plate 70 can be lowered to the landing position in the standing state along the rear guard 13 on the guide post 15 side.

According to this embodiment, the following effects can be obtained.

(1) The body frame 10 is freely movable with wheels attached, and the load receiving base 50, which is connected to the caster stoppers 60 and the bridge plate 70, can be moved up and down. For example, it is not limited to cargo handling using pallets, but can efficiently handle cargo between the cargo bed of a truck that is not equipped with a cargo receiving platform lifting device and the ground, and cargo handling work between the ground and the warehouse platform. is executable.

(2) The caster stopper 60 has a structure in which the rear edge protrudes from the upper surface of the load receiving table 50 due to its own weight when the load receiving table 50 is not on the ground, and the mechanism of the caster stopper 60 can be simplified.

(3) The bridge plate 70 can be automatically raised and expanded by the guide mechanism 75 . Therefore, for example, even when the load receiving platform 50 is lowered while the load receiving platform 50 is in the raised position, the crossing plate 70 can be prevented from colliding with the horizontal frame portion 12 .

(4) The lifting drive mechanism 80 for lifting and lowering the load receiving table 50 includes a lifting hydraulic cylinder 90, a movable sheave group 81 and a fixed sheave group 82 whose mutual spacing changes due to expansion and contraction of the cylinder 90, and windings between both sheave groups. It has wires 95A and 95B to be turned, and one hydraulic cylinder 90 is used to pay out and pull up the two wires 95A and 95B. Therefore, compared with the case where hydraulic cylinders are used for the left and right runners 30, only one hydraulic cylinder is required, and the cost can be reduced. In addition, the degree of freedom in arranging the hydraulic cylinders 90 is large, and by arranging the hydraulic cylinders 90 in the horizontal frame portion 12, the outer shape of the mobile lift 1 can be made compact.

Although the present invention has been described above with reference to the embodiments, it will be understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiments within the scope of the claims. By the way. Modifications will be discussed below.

Although the lifting hydraulic cylinder 90 is used in the above embodiment, an electric cylinder may be used instead of the hydraulic cylinder. In this case, the power unit 45 can be omitted.

1 mobile lift 5 casters 10 body frame 12 horizontal frame portion 15 guide post 16 guide portion 17 strut portion 30 runners 31, 76 rollers 50 load receiving table 55 bridge plate lock mechanism 60 caster stopper 70 bridge plate 75 guide mechanism 77 guide member 80 elevation Drive Mechanism 81 Movable Sheave Group 82 Fixed Sheave Group 90 Elevating Hydraulic Cylinders 95A, 95B Wire

Claims (3)

a body frame having a pair of guide posts and a lateral frame portion disposed between the pair of guide posts;
wheels for movably supporting the body frame;
a runner provided on each of the pair of guide posts so as to be movable up and down;
a receiving platform fixed to the lower part of the runner;
a lifting drive mechanism for lifting and lowering the runner and the load receiving platform;
a caster stopper rotatably provided on the front edge side of the load receiving platform;
a bridge plate rotatably provided on the trailing edge side of the load receiving platform;
and a guide mechanism for erecting the bridge plate,
The guide mechanism has a roller attached to the side of the bridge plate, and a guide member fixed to the guide post and in contact with the roller,
The movable lift, wherein the guide mechanism raises the spread plate in the unfolded state while the load receiving platform is descending from a predetermined raised position. 2. The mobile lift according to claim 1, wherein said caster stopper protrudes from the upper surface of said load-receiving table due to its own weight when said caster stopper is in a non-landing position. The elevating drive mechanism includes an elevating cylinder, a movable sheave and a fixed sheave whose mutual distance changes due to expansion and contraction of the elevating cylinder, and a wire wound between both sheaves,
The elevating cylinder, the movable sheave and the fixed sheave are arranged in the lateral frame,
3. A mobile lift according to claim 1 or 2 , wherein one end of said wire is connected to said runner and the other end is fixed inside said transverse frame part.

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