JPH09295797A - Elevator for object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an object to be lifted and lowered from moving relative to a base by constituting that when a link mechanism makes sliding movements in the longitudinal direction between states of the link mechanism in an upright and a prostrate attitudes, and that the object to be lifted and lowered moves in the vertical direction. SOLUTION: An object support member 6 of a link mechanism 3 supports an object 2 to be lifted and lowered through a mutual sliding mechanism 2a. A brake mechanism (brake member 8) is rotatably attached to a support member 2b through a shaft pin 8a. Engagement between a support arm 7 and the brake mechanism is disengaged when the brake member 8 pushes the engagement portion 7a of the support arm 7 to the position of a space 6d. At the same time, the object 2 and the link mechanism 3 disengage from each other, the link mechanism 3 while leaning forward moves forward, and the object 2 moves downward. The height of the object 2 may be adjusted by stopping the engagement portion 7a by engagement with an appropriate position of a protrusion/recess portion of the brake mechanism (a guide rod 6c).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for an object, and the lifting mechanism includes a novel idea. Examples of its use include a side table where the top can be raised and lowered, a step that can be raised and lowered, a table that can be raised and lowered, or an item lifter for moving various items in the vertical direction. Various devices such as a device for raising and lowering an article by moving the legs from a standing state to a lying state, that is, a tilted state and moving the article table up and down are included.

[0002]

2. Description of the Related Art Conventionally, an object lifting device is known. For example, a mechanism in which a pantograph-type leg is provided between an ascending / descending object and a base, and the ascending / descending object is vertically moved up and down as the leg moves up and down. Or, rotatably attach the lower end of the leg (link mechanism) to the base between the lifting object and the base,
A mechanism in which the upper ends of the legs are fixed to an ascending / descending object, and the elevating / lowering object moves vertically while following the standing and lying down due to the rotation of the legs.

[0003]

The above-mentioned two conventional mechanisms have the following problems. The former must have a structure in which the legs change in the width direction in the width direction even on the base side of the legs because the legs are pantograph type.
It has a complicated structure, and is not suitable in terms of strength and material cost for an object having a wide width of the lifting object. In the latter case, the ascending / descending object is moved to the front or the rear when the object rises with respect to the base, and requires an extra area or volume as can be easily understood from a plan view. The larger the property, the greater the loss. The object lifting device according to the present invention solves all the above problems.

[0004]

One of them is that "a link mechanism is interposed between a base and an ascending / descending object, and the link mechanism is rotatable around the front and rear legs and the upper ends of the both legs. And an object support that is connected in a state, and the lower ends of the legs are rotatably supported with respect to the base. Is movably supported, and one end of the support arm is rotatably connected to a desired position in the vertical direction of the front leg, and the other end of the support arm is rotatably connected to the lifting object. The lifting device for an object is characterized in that the lifting object moves in the vertical direction when the link mechanism slides back and forth in the upright state and the lying state with respect to the lifting object. ” Two of them are "a side table in which the base is the main body of the side table, the lifting object is the top plate of the side table, and the top plate is freely movable up and down". The three of these are "in the above-mentioned object lifting device, a braking mechanism is provided for the link mechanism and the lifting object to brake the lifting state of the lifting object."

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the object lifting apparatus according to the present invention, one end of the link mechanism is attached to the base, and the other end supports the lifting object. However, the front leg and the rear leg of the link mechanism may each be a pair of left and right four legs, or one of both legs may be a single leg and the other leg may be a left and right pair of three legs in a triangular shape in a plan view. The upper ends of these legs are rotatably attached to and connected to the object support. Further, since the lower end portions of the legs are rotatably supported by the base, the link mechanism swings from the standing state to the lying state with the shaft supporting portion serving as a fulcrum.

The legs may be plate-shaped or rod-shaped. The object support may be a frame type, a plate-shaped body or the like. In short, it suffices that the front and rear legs be integrally connected to support the lifting object. The ascending / descending object only needs to support the object, and is, for example, a box body, a receiving frame, a step, a top board, or the like for receiving the article. The base only needs to be able to pivotally support the legs. Therefore, some have a fixed base and some have a movable base. For example, a concrete base or a steel frame base may be used as long as it is a lifting device for large objects. If it is movable, it corresponds to the form base, and if it is a side desk, the storage main body corresponds to the base.

In order for the legs to lie down or stand up while the object support slides in the front-back direction with respect to the ascending / descending object, a slide mechanism is provided between the two. For example, there are a fitting method using a guide groove and a method using a telescopic slide fitting. Furthermore, the end portion of the support arm is rotatably connected to the desired position of the middle portion of the leg and the desired position of the lifting object. As a result, when the link mechanism moves in the front-back direction, the lifting object vertically moves up and down. It can be understood from the motion trajectory that when the support arm is connected to the leg and the lifting object, a slight positional displacement occurs in the front-back direction when the lifting object moves up and down due to the connection positional relationship.

A braking mechanism is provided for the link mechanism and the lifting object so that the lifting state of the lifting object can be controlled and held in the standing state, the intermediate tilted state, the almost tilted state, etc. of the link mechanism. Therefore, the lifting object can hold a desired height by adjusting the height. Therefore, the top plate of the side desk can be installed at the same height as the top plate of the main desk. When not in use, the top of the side table can be laid down to reduce the height and stored in the space below the top of the main desk. The height can be adjusted according to the height of the person, such as a springboard or a table. As a specific example of the braking mechanism, a ratchet type engagement tooth is provided in the vicinity of the object support portion of the link mechanism,
A handle with an engaging protrusion that engages with the engaging teeth in a disengageable manner and holds the engaged state can be provided on the lifting object. Of course, it goes without saying that the braking mechanism can be designed so that the link mechanism can perform the rotational movement operation only in the standing state and the lying state.

[0009]

1 to 6 show an embodiment of an object lifting device according to the present invention. Reference numeral 1 is a base of a rectangular plate-like object, 2 is a rectangular plate-like object, that is, a so-called table-like lifting object, and 3 is a link mechanism.
Supporting metal fittings 1a are attached to the four corners of the base. On the back surface of the lifting object, a pair of left and right guide grooves 2a, 2
The slide mechanism consisting of a is formed over the entire length in the front-rear direction. Reference numeral 2b is a support piece, and 2c is an engagement hole formed in the support piece into which the engaging portion 7a of the support arm is engaged.

The link mechanism 3 comprises a front leg 4, a rear leg 5, and an object support 6. The pair of left and right front legs 4 and 4 are integrated by a connecting rod 4a, and the lower end portion is bent to support the metal fitting 1
The shaft supporting portions 4b and 4b are supported by a. The rear leg 5 is also made in the same manner as the front leg, and 5a is a connecting rod and 5b is a shaft support. Reference numeral 6 denotes an object support, which is formed in a rectangular plate shape. On its upper surface, a pair of guide protrusions 6a, 6a are provided on the left and right.
Is formed over the entire length in the front-back direction. The projections 6a, 6a are the guide grooves 2a, 2
It is inserted into a to form a slide mechanism, and the support is supported slidably in the front-rear direction with respect to the lifting object. 6b
Are metal fittings for rotatably mounting the front legs and the rear legs, and a pair of metal fittings are formed in front of and behind the support. As shown in FIG. 3, the connecting rods 4a and 5a are rotatably supported. 6c is a braking mechanism. A plurality of convex and concave portions are formed so that the engaging portion 7a of the support arm can be locked stepwise. 6d is a space.

Reference numeral 7 denotes a support arm, which is displaced from the front leg 4 by a desired angle. The tip is bent outward to form an engaging portion 7a. This arm is attached to only one front leg. As shown in the figure, it is rotatably supported on the middle portion of the front leg via a shaft support 7b. Although not shown, the support arm is elastically supported by a spring so as to restore in the leg direction. This arm may also be attached to the rear leg. When the engaging portion 7a is engaged in the engaging hole 2c of the ascending / descending object, the ascending / descending object can be moved in the vertical direction with respect to the slide of the link mechanism in the front-rear direction.

2 and 3 show a front view and a left side view of a normal standing state in which each member of the link mechanism 3 of FIG. 1 is assembled. In this state, since the engaging portion 7a of the support arm 7 is engaged with the braking mechanism 6c, the link mechanism does not tilt. Release the engagement between the engaging portion 7a and the braking mechanism 6c,
When the link mechanism is pushed forward, to the left in the drawing, both legs 4 and 5 tilt while rotating around the shaft support portions 4b and 5b at the lower end as rotation axes, and are in a lying state as shown in FIG. The reverse operation may be performed to return from this state to the standing state. In order to keep the link mechanism more completely self-supporting in the standing state, it is free to choose a fastening means that allows the legs to be preliminarily fixed to the base in order to prevent accidentally falling forward. it can.

5 and 6 show the standing state and the lying state in which the lifting / lowering object 2 is attached to the link mechanism 3. Lifting object 2
Indicates the top plate. The object support 6 of the link mechanism supports the lifting object 2 via the mutual slide mechanism. A braking mechanism (braking tool 8) is rotatably attached to the support piece 2b via a shaft pin 8a, and the braking tool 8 pushes the engaging portion 7a of the support arm to the position of the space 6d. The support arm and the braking mechanism are disengaged, and at the same time, the engagement between the lifting object and the link mechanism is released, and the link mechanism moves while tilting forward of the lifting object, and the lifting object moves downward. As a result, as shown in FIG. 6, the link mechanism is in the down position. Further, the height of the lifting object can be adjusted by locking the engaging portion 7a in the convex and concave portions at appropriate positions of the braking mechanism 6c. Reference numeral 8b is a grasping portion that moves in the direction of the arrow.

FIG. 7 shows another embodiment. A braking mechanism 6c is formed on the object support 6 as a ratchet-like or saw-tooth-like engaging convex / concave portion. The engaging projections of the braking tool 8 mesh with the engaging projections and depressions to prevent the link mechanism from sliding forward with respect to the ascending / descending object. Reference numeral 7c is a guide member such as a guide roller, and the engaging portion 7a of the support arm is inserted into its shaft hole. The guide member 7c moves back and forth along the guide receiving portion 6c1 while rotating if it is a roller and sliding if it is a sliding body.

FIG. 8 shows another embodiment of the braking mechanism provided in the link mechanism. This braking mechanism is a stepless type, and unlike the stepped type, cannot hold the link mechanism in a tilted state on the way. In other words, it is only standing or lying down. Although not shown, the engaging portion 7a is fitted and engaged in the fitting hole 2c of the support piece 2b, and is further fitted and engaged in the fitting hole of the guide member 7c. 6c is a guide rod. The guide member 7c moves between both ends while being guided by the guide rod.

[0016]

As described in the above-mentioned configuration and operation, the object lifting device of the present invention has the front legs and the rear legs connecting their upper ends to each other through the object support, and the lower ends of both legs with respect to the base. Since it is rotatably supported and the object support and the lifting object are connected via the slide mechanism, one end of the support arm is connected to the middle part of the leg and the other end is connected to the support piece 2b. Therefore, it is characterized that the lifting object moves in the vertical direction, that is, the vertical direction by moving both legs forward or in a tilted state.Moreover, by providing a braking mechanism as necessary, The height of the lifting object can be adjusted by tilting.

However, the vertical movement of the ascending / descending object is a vertical movement, and there is little or no horizontal movement. The top plate (elevating object) moves in the front-back direction together with the legs as in the conventional example. The drawbacks of doing
The disadvantage of increased volume is eliminated. If it is explained using a side desk, conventionally, the top plate largely protrudes forward in the upright state with respect to the storage main body portion, but in the present invention, the top plate does not protrude forward even in the upright state.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an object lifting / lowering device of the present invention, in which each member used therein is disassembled.

FIG. 2 is a schematic front view of the link mechanism in a standing state.

FIG. 3 is a schematic left side view of the same.

FIG. 4 is a schematic front view of the state of FIG. 2 lying down.

FIG. 5 is a schematic front view of a standing state in which an ascending / descending object and a braking mechanism are attached to the link mechanism.

FIG. 6 is a schematic front view of the laid-down state of FIG.

FIG. 7 is a schematic front view showing another embodiment.

FIG. 8 is a schematic front view of main parts showing another embodiment of the link mechanism.

[Explanation of symbols]

 1 Base (main body of armpit) 2 Lifting object (top board of armpit) 2a Guide groove (slide mechanism) 2b Support piece 2c Engagement hole 3 Link mechanism 4 Front leg 4b Shaft support 5 Rear leg 5b Shaft support 6 Object support Body 6a Guide protrusion (sliding mechanism) 6c Braking mechanism (guide rod) 7 Support arm 7a Engaging portion 7c Guide member 8 Braking mechanism (braking tool)

Claims (3)

[Claims] 1. An object support body having a link mechanism interposed between a base and an ascending / descending object, the link mechanism connecting front and rear legs to upper ends of the both legs in a rotatable state. And further, the lower ends of the both legs are rotatably supported with respect to the base, the object support is movably supported in the front-rear direction via a slide mechanism, Furthermore, one end of the support arm is rotatably connected to a desired position in the vertical middle part of the front leg, and the other end of the support arm is rotatably connected to the ascending / descending object. The object elevating / lowering device is characterized in that the elevating / lowering object moves in the up / down direction when sliding in the front-back direction between the above state and the lying state. 2. The object lifting device according to claim 1, wherein the base is a main body of the armpit and the lifting object is a top plate of the armpit. 3. The object lifting device according to claim 1 or 2, wherein a braking mechanism is provided for the link mechanism and the lifting object to brake the lifting state of the lifting object.