JPH10252259A - Working table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working table having a pair of legs to constitute a stepladder and a base plate, with which sideways movement is made practicable by furnishing caster devices to enable flotation of the working table only on the condition that no operator is on and the caster devices are arranged as not constituting any obstruction for going up and down the legs or working around the legs. SOLUTION: Legs 2 and 3 constitute a stepladder, and a corner member 10 is installed by welding at each inside corner formed from the undersurface of each end of the undermost cross-bar 7 and the inner surface of a column 6 on each side. The corner member 10 is provided with a caster mounting part 13 rigidly, and therto a caster 9 is attached. The corner member 10 works as a brace as conventional meaning, which is therefore no more needed and interference with the caster 9 can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work table which can be easily moved laterally during use and can increase rigidity.

[0002]

2. Description of the Related Art A workbench 100 as shown in FIGS. 15 and 16 is conventionally known. The work table 100 includes a pair of legs 101 and 102, and both legs 101 and 102.
And a base plate 103 supported on the upper side.
Only one leg 101 can be used for lifting and lowering, and the other leg 102 mainly functions as a support frame. Therefore, the leg 101 for raising and lowering is provided with a plurality of horizontal rails 104 used as a step rail at predetermined intervals in the vertical direction. The leg 102 on the support frame side is also provided with some horizontal rails 105 for reinforcement or the like.

[0003] The base plate 103 is formed to some extent wide so as to be able to work on it. The base plate 103 is moved from the up-and-down leg 101 to the support frame side leg 1.
One end is swingably connected by a fulcrum part 106 protruding toward 02, and the other end to which the fulcrum swings is provided at a fulcrum provided in the middle part of the back surface of the base plate 103. It is supported by a connecting arm 109 that connects the portion 107 and a fulcrum 108 projecting from the support frame side leg 102 to the leg 101 for lifting and lowering.

By the way, since this type of work table 100 is mainly used for work at a high place on an indoor ceiling or the like, it is necessary to work on the base plate 103 and to get down from the base plate 103 and lay the work table 100 sideways. It may be necessary to repeat the moving operation many times. Therefore, for the purpose of facilitating the lateral movement, a caster device (not shown) attached to the lower ends of the two legs 101 and 102 is prepared as an accessory.

[0005] This caster device is provided with an appropriate spring-type floating mechanism that can lift the work table 100 only when no worker is on the work table 100. When riding, legs 10
1, 102 are grounded and become immobile, that is, the structure is such that casters do not act. Generally, legs 10
1 and 102, the lowest cross rail 104, 1
Since a brace (inclined material) 112 for increasing the rigidity of the legs 101 and 102 is provided at a lower portion on both ends of the 05, in order to avoid interference with the brace 112,
The caster device had to be externally attached while protruding around the legs 101 and 102. Therefore, the workbench 1
There is a case that the work may be hindered from going up and down to 00 and the work around it, and is attached to the legs 101 and 102 only when necessary using a screw clamp.

[0006]

In the above caster device, not only is it troublesome to attach and detach the casters to and from the legs 101 and 102, but also it is troublesome to manage the detached casters. In addition, although it is only at the time of attachment to the legs 101 and 102, it is not preferable that the lifting and lowering to the work table 100 and the work around the work table are obstructed.

On the other hand, the legs 101 for raising and lowering and the base plate 10
3 and the fulcrum 108 connecting the connecting arm 109 and the leg 102 on the support frame side, the base plate is protruded inward from the worktable 100 as described above. It supports all loads applied to 103. Moreover, not only the fulcrum portions 106 and 108 but also the connecting arm 109 has a hinge structure using a plate material.
The fulcrums 106 and 108 and the connecting arm 109 may be bent in the left-right direction or the up-down direction by a certain beat.

[0008] In this case, a twisting action occurs on the base plate 103 with the legs 101 and 102 being opened,
The opening and closing of the legs 101 and 102 could not be performed smoothly. The present invention has been made in view of the above circumstances, in order to facilitate the lateral movement of the work table by providing casters, without disturbing the climbing and descending to the work table and peripheral work, It is a first object of the present invention to provide a work table which can save the trouble as it is not necessary to remove the caster even when the caster is not used.

Further, the present invention reinforces the support structure of the base plate during use so as not to cause bending of the fulcrum portion and to prevent the base plate from being twisted in use in use. It is a second object of the present invention to provide a work table that allows the legs to be smoothly opened and closed forever.

[0010]

According to the present invention, the following technical measures are taken in order to achieve the first object. That is, in the workbench according to the present invention, at least the lower end of both ends of the horizontal rail at the lowermost side in the legs for lifting and lowering,
A corner member is provided instead of the conventional brace. This corner member enhances the rigidity of the leg by reinforcing the inner corner formed by the lower surface of the horizontal rail and the inner surfaces of the struts on both sides of the horizontal rail. It has the same function as the above, but also has a caster mounting part.

That is, since this corner member is formed in consideration of the attachment of the caster from the beginning, the corner member naturally does not interfere with the caster. Therefore, the caster can be attached to the leg in a position and a state where the caster does not obstruct the ascent and descent to the worktable and the peripheral work. Since the casters do not hinder the operation, it is not necessary to attach or remove the casters as necessary or unnecessary, thereby saving labor in handling.

The corner member may be formed by cutting a predetermined length from a previously manufactured strip material as required. In this case, the strip is manufactured so that its longitudinal direction is along the horizontal rail. With such a structure, even if the span (length) of the horizontal rail changes when, for example, a product of a different size is manufactured as a work table or when the design of the work table is changed, this does not apply. By simply changing the cutting length of the strip or changing the cutting angle, it is possible to easily and flexibly cope with it. That is, since the material can be shared as a forming material for the corner member, the cost can be reduced in each of the above cases.

When the corner member is attached in a state where the lower surface of the horizontal rail and the inner surface of the column are brought into line contact with each other and the contact portions are welded, the joining strength is increased, and the mechanical strength of the corner member itself is increased. There is an advantage that the target strength can be increased. Therefore, the rigidity of the entire leg can also be increased. Such effects cannot be obtained with conventional braces.

On the other hand, in the present invention, the following technical means have been taken in order to achieve the second object. That is, the base plate is
When both legs are opened, both ends of the base plate are supported by both legs so as to extend to the upper surface side of each horizontal rail. For this reason, a fulcrum connecting one leg and one end of the base plate and a fulcrum connecting the connecting arm and the other leg are not subjected to an excessive load.
The base plate can be stably supported on both legs.

Since both of the above-mentioned fulcrum portions are provided on the horizontal rails for the respective legs, the fulcrum portions hardly bend in the first place. In the present invention, the connecting arm does not function to support the base plate in the use state of the work table, but is required for flipping up the base plate when both legs are closed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the work table 1 according to the present invention has a pair of legs 2 and 3 and a base plate 4 supported by the legs 2 and 3 above. The bodies 2 and 3 can be opened and closed between an open state and a closed state.

Each of the legs 2 and 3 has a pair of columns 6.
And horizontal bars 7 provided at predetermined intervals in the vertical direction so as to connect the columns 6 to each other, and are framed in a flared trapezoidal shape. Prop 6 and crossbar 7
For example, a hollow strip made of an aluminum alloy extruded material having an appropriate cross-sectional shape is used. One or both legs 2,
In 3, each horizontal rail 7 is used as a step rail for raising and lowering. Corner members 10 provided with casters 9 are provided at inner corners on both sides formed by the lower surface of the lowermost horizontal rail 7 of both legs 2 and 3 and the inner surface of the column 6.

First, the corner member 10 will be described.
As shown in FIGS. 4 to 9, the corner member 10 includes an upright wall portion 12 having a hollow board structure and a caster mounting portion provided in a lower portion of the upright wall portion 12 and having a rectangular parallelepiped cross section. 13 are integrally provided. This corner member 1
0 is formed by cutting out a predetermined length based on a strip 14 (see FIG. 10) formed as an extruded material made of an aluminum alloy as described later.

The upright wall portion 12 has both sides inclined so as to correspond to the trapezoidal oblique sides of the legs 2 and 3. The corner members 10 have the same shape in a diagonal arrangement when the four pillars 6 of the two legs 2 and 3 are viewed in a plan view, and have a diagonal arrangement in which they intersect. Have a line-symmetrical shape with respect to the above-mentioned one with respect to the perpendicular direction (that is, the inclination of both sides in the state of front view (FIG. 5) is opposite to the left and right) ).

The upright wall portion 12 is attached so that when the legs 2 and 3 are opened and viewed from the side (see FIG. 2), the standing wall portion 12 is inclined along the opening angle thereof. The upper surface portion 13a and the lower surface portion 13b of the caster mounting portion 13 are formed to be substantially horizontal. The corner member 10 having such a shape can be joined in a line contact state to each of the lower surface of the horizontal rail 7 and the inner surface of the column 6, as shown in FIG. 4, and all the line contact portions can be welded. Things. Therefore, extremely strong bonding strength can be obtained. This means that the corner member 10
Not only can it increase its mechanical strength,
There is an advantage that the rigidity of can be increased.

In the caster mounting portion 13, two caster mounting holes 15 and 16 are formed on the left and right sides of the upper surface 13a and the lower surface 13b, respectively. Have been. The caster mounting hole 15 formed in the upper surface 13a has a small diameter, and the caster mounting hole 16 formed in the lower surface 13b has a large diameter.

The reason why the two caster mounting holes 15 and 16 are provided on the left and right sides is to achieve commonality of components in a diagonal arrangement. Actually, the caster mounting holes 15 and 16 farther from the column 6 are provided. Are used for mounting the casters 9.
For this reason, when it is not necessary to consider the common use of components, the caster mounting holes 15 and 16 may be provided in a predetermined arrangement one by one.

On the other hand, the caster 9 is provided with a pivot portion 18 vertically penetrating the caster mounting portion 13, and the caster 9 can swing freely about the pivot portion 18. The pivot 18 is formed by the upper thin shaft 1 whose up and down movement is guided by the upper caster mounting hole 15.
8a and a lower thick shaft 18b whose up and down movement is guided by a lower caster mounting hole 16.

An elastic member 20 such as a coil spring is fitted into a portion of the upper thin shaft 18a passing through the caster mounting portion 13, and a split pin is mounted on a portion protruding upward from the upper caster mounting hole 15. A stopper 21 made of a metal or a beta pin is attached. Elastic tool 20
The one having a spring force that allows the work table 1 to float only when the worker is not on the work table 1 is used. Therefore, in this state, the work table 1 can be moved laterally to an arbitrary position as needed. Also,
If the worker gets on the work table 1 after the lateral movement, the legs 2,
The lower end of 3 is grounded and becomes immobile.

A non-slip cap 24 made of an elastic material such as rubber or soft resin or the like is provided at the lower end of each column 6 of the legs 2 and 3 so that the grounding state is stabilized.
Is attached. As is clear from the above description, when the two legs 2 and 3 are opened (see FIG. 2), the casters 9 are arranged below the caster mounting portion 13 in the corner member 10, and Since the corner member 10 itself is provided in the lower part of the horizontal rail 7 in the first place, as a result, the casters 9
, And does not protrude significantly outside the legs 2 and 3. Therefore, the casters 9 do not hinder the lifting and lowering of the legs 2 and 3 and the work around them.

When the legs 2 and 3 are closed (see FIG. 3), the work table 1 can be made to stand on its own in such a manner that all the non-slip caps 24 stand on the toes.
That is, in this state, the casters 9
Will be hidden above and inward of the toe of the non-slip cap 24 so as not to hinder the independence of the user. Therefore,
The work table 1 with both legs 2 and 3 closed (not used) can be easily transported and stored, and is compact.

Since the above-mentioned corner member 10 is formed by cutting a predetermined length from the strip 14 as shown in FIG. 10, only the inclination of the cutting direction with respect to the strip 14 is made different from right to left. Thus, the two types of corner members 10 provided on both sides with opposite inclinations on the left and right sides can be easily formed and separated. Also, for example, when manufacturing products having different sizes as the work table 1,
Even if the span (length) of the horizontal rail 7 changes when the design of the work table 1 is changed, this can be easily achieved by simply changing the cutting length of the strip 14 or changing the cutting angle. And it can be dealt with flexibly.

Next, the base plate 4 will be described. Base plate 4
As shown in FIG. 1 and FIG. 2, when the legs 2 and 3 are opened, they are passed between the upper portions of the horizontal rail 7 which is the uppermost side thereof. When the two legs 2 and 3 are closed as shown in FIG. To jump up.

As shown in FIGS. 11 and 12, the base plate 4 has a frame structure in which a reinforcing frame 29 is provided on a lower outer periphery of a top plate 28 made of an aluminum alloy. Accordingly, a downward space is formed on the back surface of the base plate 4,
The connection arm 27 described above can be accommodated in this back surface space. A fulcrum 32 that swingably connects one end of the base plate 4 to one leg 2 is provided on the horizontal rail 7 of the leg 2. Needless to say, the base plate 4 is
Can be locked on the cross rail 7 of the other leg 3 within the swing range around.

The base plate 4 is provided with a hinge base 33 protruding inward in the width direction from an intermediate portion of the back space, and one end of the connecting arm 27 is connected to the hinge base 33. A fulcrum portion 34 that is connected to be swingable is provided. Further, the other end of the connecting arm 27 and the other leg 3
The fulcrum portion 35 that swingably connects the
Is provided on the horizontal rail 7.

A cushioning material 3 made of rubber, soft resin or the like is provided between the upper and lower sides of the horizontal rail 7 of the legs 2 and 3 and the base plate 4.
7 is provided to prevent rattling of the base plate 4 and to prevent generation of contact noise between the base plate 4 and the horizontal rail 7. For this reason, even when the legs 2 and 3 are repeatedly opened and closed, the connecting arm 27 does not contact the reinforcing frame 29 of the base plate 4. When the legs 2 and 3 are opened and used, the base plate 4 is not supported by the connecting arm 27 but is supported by the legs 2 and 3 via the cushioning material 37.

Therefore, the fulcrum portions 32, 34, 35 are not deformed by an excessive force and the connecting arm 27 is not bent. Therefore, both legs 2, 3
In this state, no twisting action occurs in the base plate 4 in the opened state, and opening and closing of the legs 2 and 3 does not become difficult. In addition,
In FIG. 12, the cushioning members 37 are provided at both ends in the longitudinal direction (the left-right direction in FIG. 12) of the base plate 4, but may be provided in only one of the same directions. From the viewpoint of prevention, the buffer material 37 on one end side (the left side in FIG. 12) of the base plate 4 may be omitted.

In the work table 1 according to the present embodiment, when both legs 2 and 3 are closed as shown in FIG. 3 (when not in use).
The legs 2 and 3 are parallel to each other, and at this time, the casters 9 do not protrude outward from the legs 2 and 3. Therefore, when the worktables 1 are stacked, there is an advantage that the worktables 1 can be all stacked in the same direction, and there is also an advantage that the stacked state is stabilized.

The present invention is not limited to the above embodiments. For example, the various members including the corner member 10 are not limited to being made of an aluminum alloy. Also, the corner member 10 is shown in FIG.
Various cross-sectional shapes can be adopted as shown in (a) to (d). In particular, as is clear from FIG. 13D, the caster mounting portion 13 is not limited to have a cross-sectional shape closed in a square pipe shape.

On the other hand, the work table 1 according to the present invention is not limited to a stepladder (triangular side shape), but may be a trapezoidal side surface as shown in FIG. Is also possible. In this case, the connecting arm 40 connecting the legs 2 and 3 and the base plate 4 is connected.
Although not shown in the drawings, the legs 2 and 3 and the base plate 4 are connected to each other by forming a structure that can be bent at the middle portion in the longitudinal direction or a long hole structure in which one of the fulcrum portions is slidable. Should be allowed to be folded.

Of the legs 2, 3, only one may be used for raising and lowering and the other may be used as a support frame, or both may be used for raising and lowering. It is possible to adopt a structure that does not include such a structure, or a structure that does not include the casters 9 for such a leg.
Of course, the fulcrum parts 32, 34, 3 when the base plate 4 is provided
The arrangement relationship of the arm 5 and the connecting arm 27 may be reversed from that of the above embodiment.

[0037]

As is apparent from the above description, the present invention for achieving the first object has a structure in which the caster mounting portions are provided at least at the lower end of both ends of the lowermost horizontal rail in the up and down legs. Is provided. Since this corner member was formed taking into account the mounting of the caster from the beginning, it naturally does not interfere with the caster, so that the caster does not interfere with climbing and descending to the work table and peripheral work. It can be attached to the leg as a position and state that should not be.

Further, there is no need to mount or remove casters depending on whether or not casters are used.
It saves trouble in handling. Of course, the troublesome work of managing the casters that have been removed can be omitted. If the corner member is formed by cutting a predetermined length from the strip material, it is possible to easily and flexibly cope with a change in the size and shape of the corner member, and the common use as a forming material can be achieved. This enables cost reduction.

Since such a corner member can be brought into line contact with each of the lower surface of the horizontal rail and the inner surface of the column, welding can be performed.
There are advantages that the joining strength is increased, the mechanical strength of the corner member itself can be enhanced, and the rigidity of the entire leg can be increased. On the other hand, according to the present invention for achieving the second object, the base plate is supported on both of the legs in a state of being placed on each of the horizontal rails when both legs are opened. And Therefore, the fulcrum connecting one leg and one end of the base plate, or the fulcrum connecting the connecting arm and the other leg, does not cause any unreasonable action in the first place, and therefore does not deform. Therefore, the opening and closing of the legs can be performed smoothly forever. Further, there is an advantage that the support structure of the base plate during use is strengthened and stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state in which both legs are opened in a work table according to the present invention.

FIG. 2 is a side view corresponding to FIG.

FIG. 3 is a side view showing a non-use state (a housed state) in which both legs are closed on the work table;

FIG. 4 is an enlarged fragmentary view showing a mounting portion of a corner member in FIG. 2;

FIG. 5 is a front view of a corner member (corresponding to FIG. 4).

FIG. 6 is a right side view corresponding to FIG.

FIG. 7 is a rear view corresponding to FIG. 5;

FIG. 8 is a plan view corresponding to FIG.

FIG. 9 is a bottom view corresponding to FIG. 5;

FIG. 10 is a front view illustrating a cutting state of a strip serving as a material for forming a corner member.

FIG. 11 is an enlarged view taken on line AA of FIG. 2;

FIG. 12 is a sectional view taken along line BB of FIG. 11;

FIG. 13 is a side view showing another embodiment of the corner member.

FIG. 14 is a schematic side view showing another embodiment as a work table.

FIG. 15 is a side view showing a conventional work table.

16 is a view corresponding to the view taken along line CC of FIG. 15;

[Explanation of Signs] 1 work table 2 legs 3 legs 4 base plate 6 column 7 side beam 10 corner member 13 caster mounting part 14 bar 27 connecting arm 32 fulcrum

Claims (4)

[Claims] 1. A worktable having a pair of legs (2, 3) and a base plate (4) supported above by the legs (2, 3), at least a leg for raising and lowering. 2) is formed with a frame having a pair of columns (6) and a horizontal beam (7) connecting at least the lower portion between the columns (6), and the lowermost horizontal beam (7) is formed. Corner members (10) are provided at both inner corners formed by the lower surface of (7) and the inner surfaces of the columns (6), and the caster mounting portions (13) are provided at the corner members (10). A workbench characterized by: 2. The corner member (10) includes a crosspiece (7).
The workbench according to claim 1, wherein the work member is formed by cutting a strip material (14) elongated in a direction along the length to a predetermined length. 3. The corner member (10) includes a crosspiece (7).
3. The worktable according to claim 1, wherein the lower surface of the support and the inner surface of the support are welded to each other while maintaining a line contact state. 4. 4. One end of the base plate (4) is swingably connected to a fulcrum (32) provided on a horizontal bar (7) having a predetermined height on one leg (2). And the other end to be swung can be locked on a horizontal rail (7) of a predetermined height on the other leg (3) when both legs (2, 3) are opened. And between the middle part of the back surface of the base plate (4) and the upper part of the horizontal rail (7) of the leg body (3) which receives the swinging tip of the base plate (4), Base plate (4) to close 3)
4. The workbench according to claim 1, further comprising a connecting arm (27) for jumping up and swinging the work.