JP2016215950A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device which can reduce the diameter of a lifting cylinder pulling up a lifting platform through a wire and is convenient for inspection and length adjustment of the wire.SOLUTION: The lifting device comprises a pair of outer guide posts 1, a horizontal frame 20 between the outer guide posts, a platform 10 installed to the outer guide posts 1 to freely move up and down, a lifting cylinder LC and a hydraulic pressure source 30 installed inside the horizontal frame, and a wire interlocking mechanism 40 for interlockingly connecting the lifting cylinder and the platform. The wire interlocking mechanism 40 includes fixed sheaves 42a, 42b and movable sheaves 41a, 41b whose mutual distance increases when the lifting cylinder is contracted, and wires 50a, 50b wound between both sheaves. One end of the wire is connected to the platform, and the other end thereof is fixed to the inside of the outer guide post 1. The platform is raised by the contraction operation of the lifting cylinder.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevating device mounted on a vehicle, and more particularly, to an elevating device having a structure in which a vertical guide is provided on a vehicle body frame so that an elevating platform on which a load or the like is placed can be moved up and down.

  As an example of this type of lifting device that supports a platform on which luggage or the like is loaded with vertical guidance, there is Patent Document 1 below.

Japanese Patent No. 5350746

  In this type of lifting device, a structure in which the lifting cylinder and the lifting platform are connected by a wire interlocking mechanism and the lifting platform is raised and lowered by expansion and contraction of the lifting cylinder is adopted. However, the lifting platform is raised by the extension operation of the lifting cylinder. Yes. For this reason, it is necessary to make the piston rod thick so that the piston rod of the lifting cylinder does not buckle, and there is a drawback that the entire outer diameter of the lifting cylinder is increased. Furthermore, a thick horizontal frame for storing the lifting cylinder is required.

  In addition, one end of the wire of the wire interlocking mechanism is connected to the lifting platform and the other end is fixed to the horizontal frame side. However, it is difficult to inspect the fixed portion of the wire to the horizontal frame, and the wire length adjustment work Not good.

  The present invention has been made in view of such a situation, and the purpose of the present invention is to make it possible to reduce the diameter of the lifting cylinder that pulls up the lifting platform through the wire, and is convenient for checking and adjusting the length of the wire. To provide an apparatus.

One embodiment of the present invention is a lifting device. The lifting device includes a pair of vertical outer guide posts, a horizontal frame disposed between the pair of outer guide posts, a lifting platform provided on the pair of outer guide posts so as to be lifted and lowered, A lifting cylinder provided in the horizontal frame, a hydraulic source provided in the horizontal frame to drive the lifting cylinder, and a wire interlocking mechanism for interlockingly connecting the lifting cylinder and the platform,
The wire interlocking mechanism has a movable sheave and a fixed sheave whose mutual interval is widened when the lifting cylinder is contracted, and a wire wound between the sheaves, one end of the wire being connected to the platform, An end is fixed to the inner side of the outer guide post, and the platform is raised by a contraction operation of the elevating cylinder.

  In the above aspect, the outer guide post may be provided with an opening for exposing the fixed portion of the wire.

  In the above aspect, the hydraulic pressure source includes an electric motor / pump, a valve block including an electromagnetic valve, and an oil tank, and the valve block is integrated with the electric motor / pump. The oil tanks may be connected by hydraulic piping.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the lifting device of the present invention, the lifting platform is raised by the contracting operation of the lifting cylinder, so that the piston rod of the lifting cylinder can be prevented from buckling, and the piston rod and the lifting cylinder are reduced in diameter. I can. For this reason, it is also possible to make the horizontal frame in which the elevating cylinder is arranged thin. Further, it is possible to adopt a structure in which the wire end portion of the wire interlocking mechanism interlockingly connecting the elevating cylinder and the elevating platform is fixed to the outer guide post position where inspection and length adjustment are easy.

The perspective view which shows embodiment of the raising / lowering apparatus which concerns on this invention. The structure of the main part of the embodiment, showing a pair of vertical outer guide posts, a horizontal frame disposed between the pair of outer guide posts, a lifting cylinder and a hydraulic pressure source provided in the horizontal frame, etc. The front view which abbreviate | omitted the front cover of the horizontal frame. FIG. Similarly side view. The side view which abbreviate | omitted the internal mechanism of embodiment. The front view of the state which is embodiment and has closed the raising / lowering platform. The hydraulic circuit diagram in the case of embodiment. The principal part expansion perspective view of the wire interlocking mechanism in embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  In FIG. 1 to FIG. 6, the outer guide posts 1 that vertically form a pair along the left and right sides of the rear part of the vehicle carrier 60 are attached and fixed. The outer guide post 1 is formed by integrating a hollow rectangular tube guide portion 1a and a hollow rectangular tube column portion 1b in parallel, and an inner post 2 of the hollow rectangular tube is fitted inside the guide portion 1a so as to be movable up and down. ing. Vertical slits for guiding the runner 3 to be described later up and down on the guide wall 1a of the outer guide post 1 and the front wall of the inner post 2 (the side facing the cargo bed 60 is the rear wall and the opposite side is the front wall) 1c and 2a are formed.

  A pair of inner posts 2 is provided with runners 3 that can be moved up and down. Brackets 4 are fixed to the lower ends of the outer surfaces of the runners 3, and the lifting platform 10 is deployed substantially horizontally on these brackets 4. It is pivotally supported by a pivot fulcrum Q so that it can pivot between the position and a substantially vertical storage position.

  The left and right ends of the lateral frame 20 extending in the lateral direction are connected and fixed to intermediate portions in the vertical direction of the pair of outer guide posts 1 at positions substantially coincident with the floor surface of the loading platform 60. The horizontal frame 20 is composed of a U-shaped section and a front cover, and constitutes a hollow rectangular tube body in a state in which both are integrally combined.

  Inside the horizontal frame 20 are housed a lifting cylinder LC that is a single-acting hydraulic cylinder and a hydraulic pressure source 30 for driving the lifting cylinder LC. The body 27 of the elevating cylinder LC is pivoted or fixed to the horizontal frame 20 and has a piston rod 25 that can be extended and contracted. The hydraulic source 30 includes an electric motor / pump P that drives a pump with an electric motor, a valve block VB integrated at an end of the electric motor / pump P, and an oil tank T. The valve block VB and oil The tanks T are connected by a hydraulic pipe 38. As shown in the hydraulic circuit of FIG. 7, the valve block VB opens when the shuttle valve 31, the electromagnetic switching valve 32, the flow rate adjustment valve 33, the check valve 34, and the discharge side of the motor / pump P exceed a certain pressure. And a relief valve (safety valve) 35 for returning the hydraulic oil into the oil tank T.

  When the motor / pump P is operated and the electromagnetic switching valve 32 is opened, the hydraulic oil in the oil tank T is pumped by the motor / pump P, and the shuttle valve 31, the opened electromagnetic switching valve 32 and the check valve 34 are pumped. The hydraulic oil is supplied to the elevating cylinder LC via. Further, when the electromagnetic switching valve 32 is closed, the amount of hydraulic oil in the elevating cylinder LC does not change, and the elevating cylinder LC maintains the previous state (stopped state). When the electromagnetic switching valve 32 is opened while the motor / pump P is stopped, the hydraulic oil in the elevating cylinder LC returns to the oil tank T via the flow rate adjusting valve 33, the electromagnetic switching valve 32 and the shuttle valve 31.

  As shown in FIGS. 1 and 8, a wire interlocking mechanism 40 is provided for interlockingly connecting the elevating cylinder LC and the elevating platform 10. The wire interlocking mechanism 40 has a pair of movable sheaves 41a, 41b and fixed sheaves 42a, 42b whose mutual intervals are widened when the elevating cylinder LC is contracted, the other fixed sheaves 43, 44, 45, and the left runner 3 at one end. A wire 50a to be connected and fixed and a wire 50b whose one end is connected and fixed to the right runner 3 are provided. The movable sheaves 41a and 41b are rotatably attached to a bracket 26 fixed to the tip of the piston rod 25 of the elevating cylinder LC, and the fixed sheaves 42a and 42b are rotatable at a fixed position at the right end in the horizontal frame 20. Supported (attached). A fixed sheave 43 is rotatably supported (attached) at a fixed position at the left end of the horizontal frame 20, and fixed sheaves 44 and 45 are rotatably supported at upper fixed positions in the left and right outer guide posts 1 ( Attached). Further, small-diameter fixed sheaves 46 a and 46 b are rotatably attached to intermediate positions in the right outer guide post 1.

  The wire 50a whose one end is connected and fixed to the left runner 3 is a fixed sheave 44 in the upper portion of the left outer guide post 1, a fixed sheave 43 at the left end portion in the horizontal frame 20, a fixed sheave 42a at the right end portion in the horizontal frame 20, and movable. The sheave 41a and the small-diameter fixed sheave 46a are wound in this order, and are locked and fixed to a wire fixing tool (hook) 47a attached and fixed inside the right outer guide post 1.

  A wire 50b whose one end is connected and fixed to the right runner 3 is wound in the order of a fixed sheave 45 in the upper portion of the right outer guide post 1, a fixed sheave 42b in the right end of the horizontal frame 20, a movable sheave 41b, and a small-diameter fixed sheave 46b. Then, it is locked and fixed to a wire fixing tool (hook) 47b attached and fixed inside the right outer guide post 1. The wire fixtures 47a and 47b are arranged in parallel, and can be exposed in parallel through the outward side opening 1d of the right outer guide post 1. Therefore, the inspection and length adjustment of the wires 50a and 50b can be easily performed. The opening 1d can be covered with a lid as necessary.

  In the configuration of the above embodiment, when a raising operation switch (not shown) is operated, the motor pump P is operated and the electromagnetic switching valve 32 in FIG. 7 is opened, and the hydraulic oil in the oil tank T is moved by the motor pump P. The hydraulic oil is pumped up and supplied to the lift cylinder LC via the shuttle valve 31, the open electromagnetic switching valve 32 and the check valve 34. As a result, the elevating cylinder LC is retracted from the extended state of the piston rod 25 shown in FIGS. 1 and 2, and the distance between the movable sheaves 41a and 41b and the fixed sheaves 42a and 42b is increased. As a result, the runner 3 and the lifting platform 10 attached thereto are pulled up along the longitudinal slits 1c and 2a of the outer guide post 1 and the inner post 2, and the platform 10 is substantially coincident with the floor surface of the loading platform 60 in FIG. The raised position is indicated by a virtual line (A). The runner 3 is configured to hook the inner post 2 in the middle of ascending (a specific mechanism is not shown), and the inner post 2 enters the inner side of the outer guide post 1 together with the runner 3 as the runner 3 rises.

  When a lowering operation switch (not shown) is operated, the electromagnetic switching valve 32 is opened while the motor / pump P is stopped, and the hydraulic oil in the elevating cylinder LC passes through the flow rate adjusting valve 33, the electromagnetic switching valve 32 and the shuttle valve 31. Return to oil tank T. As a result, the runner 3 and the lifting platform 10 attached to the runner 3 are lowered to a lowered position (landing state) indicated by a virtual line (B) in FIG. At this time, as the runner 3 descends, the inner post 2 descends below the outer guide post 1 and guides the runner 3 to descend.

  5 and 6, when the vehicle travels, the lifting platform 10 is locked in a closed state along the outer guide post 1.

  According to the present embodiment, the following effects can be achieved.

(1) Since the lifting platform 10 is raised by the contracting operation of the lifting cylinder LC, buckling of the piston rod 25 of the lifting cylinder LC can be avoided, and the diameter of the piston rod 25 can be reduced. Can be achieved. For this reason, it is also possible to make the horizontal frame 20 in which the elevating cylinder is arranged thinner.

(2) The ends of the wires 50a and 50b of the wire interlocking mechanism 40 for interlockingly connecting the elevating cylinder LC and the elevating platform 10 are connected to wire fixtures (hooks) 47a and 47b attached to the inner side surface of the outer guide post 1. Each structure is fixed, and the inspection and length adjustment of the wires 50a and 50b can be easily performed through the side opening 1d of the outer guide post 1.

(3) The elevating cylinder LC and the hydraulic power source 30 are housed in the horizontal frame 20, and there is no need to route hydraulic piping when the hydraulic power source is provided outside the elevating device. The hydraulic power source 30 for driving the elevating cylinder LC has an electric motor / pump P, a valve block VB integrated with the electric motor / pump P, and an oil tank T separately from each other. In this case, the internal space of the horizontal frame 20 can be used effectively, and the horizontal frame 20 can be made thinner.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the above embodiment, the inner post 2 is inserted into the guide portion 1 a of the pair of outer guide posts 1 to be slidable up and down, and the runner 3 is moved up and down along the outer guide post 1 and the inner post 2. However, the runner 3 may be moved up and down directly in the outer guide post 1.

DESCRIPTION OF SYMBOLS 1 Outer guide post 2 Inner post 3 Runner 10 Elevating platform 20 Horizontal frame 30 Hydraulic source 31 Shuttle valve 32 Electromagnetic switching valve 33 Flow control valve 34 Check valve 35 Relief valve 40 Wire interlock mechanism 41a, 41b Movable sheaves 42a, 42b, 43 , 44, 45 Fixed sheaves 46a, 46b Small diameter fixed sheaves 47a, 47b Wire fixtures 50a, 50b Wire 60 Loading platform LC Lifting cylinder (hydraulic cylinder)
P Electric motor / pump T Oil tank VB Valve block

Claims (3)

A pair of vertical outer guide posts,
A lateral frame disposed between the pair of outer guide posts;
An elevating platform provided on the pair of outer guide posts so as to be movable up and down;
An elevating cylinder provided in the lateral frame;
A hydraulic pressure source provided in the horizontal frame to drive the elevating cylinder;
A wire interlocking mechanism for interlockingly connecting the lifting cylinder and the platform;
The wire interlocking mechanism has a movable sheave and a fixed sheave whose mutual interval is widened when the lifting cylinder is contracted, and a wire wound between the sheaves, one end of the wire being connected to the platform, The end is fixed inside the outer guide post,
A lifting device characterized in that the platform is raised by a contracting operation of the lifting cylinder.   The lifting device according to claim 1, wherein the outer guide post is provided with an opening for exposing a fixed portion of the wire.   The hydraulic source includes an electric motor / pump, a valve block including a solenoid valve, and an oil tank. The valve block is integrated with the electric motor / pump, and the gap between the valve block and the oil tank is provided. The lifting device according to claim 1 or 2, wherein the lifting device is connected by hydraulic piping.

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