JP2014173378A - Portable type work bench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable type work bench in which the fitting structure of handhold bars erected at four corners of a top plate can be simplified and erection/storage operation of front and rear guard rods can be performed safely, simply, and quickly.SOLUTION: A portable type work bench 1 comprises: a top plate 2; a pair of left and right legs 3; handhold bars 4 erected at four corners of the top plate; and a front guard rod 5 and a rear guard rod 5 installed between the handhold bars. The handhold bars are turnably attached to left and right ends of front and rear sides of the top plate, respectively. A rail part 51 extending in the lengthwise direction is provided on the front and rear guard rods 5, and a support roller 15 is provided at an upper end of each of the handhold bars so as to roll on the rail part. As the handhold bars 4 turn, the front and rear guard rods 5 are moved up and down between an installation position where they are installed between the upper ends of the handhold bars in the erected attitude and a storage position where they are superposed on the handhold bars in the fallen attitude.

Description

  The present invention relates to a portable work table.

  In the specification and claims of the present invention, one long side of the top plate of the portable workbench (front side toward the plane of FIG. 1) is “front” and the other long side is 1 is referred to as “rear”, and left and right (left and right in FIG. 1) when viewed from the front are referred to as “left and right”.

The portable work bench is constructed with ladder-like legs foldably attached to the left and right ends of a rectangular top plate as viewed from above, and the left and right legs are folded along the bottom surface of the top plate. After being brought into a construction site or the like in a state, both legs are spread out to be in an open leg state, and in this state, an operator rides on the top board to perform interior / exterior construction. In addition, in the portable work table, clue bars are erected up and down at the four corners of the top plate so that the worker can support when the ladder-shaped legs are raised and lowered. In order to reduce the risk of falling from the top plate, a front guard rod is installed between the top ends of the two left and right clue rods on the front side of the top plate. In general, a rear guard rod is installed between upper end portions. The front and rear guard rods function so as to sense the risk of falling from the top plate when an operator contacts them.
As a portable worktable equipped with such a clue bar and front and rear guard rods, the front and rear guard rods are swingably attached to the upper ends of the two left and right clue rods on the front side and the rear side, and the tip portions are connected to each other. It is composed of two guard rod members that are detachably connected to each other, and the cue rod can take an upright standing posture and a downward folding posture along the leg column together with the guard rod member. What is attached to the upper end part of the support | pillar of a leg so that rotation is possible is known (refer the following patent document 1).

JP 2012-7470 A

The conventional portable workbench described above has a structure in which a clue bar is pivotally attached to the upper end of a leg column and can be folded along the column, but the leg column is generally easy to lift and lower. In consideration of stability, it is provided so as to incline in a divergent shape instead of vertical (see FIGS. 1 and 2), so that the structure of attaching the clue bar to the upper end of the column becomes complicated, which contributes to an increase in cost. It was.
In the case of a conventional portable workbench, in order to install the front and rear guard rods between the two left and right clue rods, first set the clue rods upright, then the left and right guard rods. The rod members need to be swung to the horizontal position to connect the tip portions of the two guard rod members, and when the front and rear guard rods are stored, it is necessary to perform the reverse operation. However, since these operations need to be performed on the top plate where the front and rear guard rods are temporarily not installed, there is a risk that an operator may fall from the top plate at that time. In addition, there is a problem that it takes time to construct and store the front and rear guard rods.

  The object of the present invention is to simplify the mounting structure of the clue bar that is set up at the four corners of the top plate, and to carry out the safe operation of the front and rear guard bars safely and easily. To provide a stand.

The portable work table according to the present invention includes a rectangular top plate as viewed from above, a pair of legs attached to the left and right ends of the top plate, four clue bars standing at the four corners of the top plate, It has a front guard rod erected between the upper ends of the two left and right clue rods, and a rear guard rod erected between the upper ends of the two left and right clue rods. In the present invention, the following characteristic configuration is adopted.
That is, in the portable worktable according to the present invention, the top and bottom cue bars can take a vertically upward standing posture and a horizontal lateral lying posture along the front side surface of the top plate. The top plate is pivotally attached to the left and right ends of the front side so that the two left and right clue bars can take an upright standing posture and a lateral lying posture along the rear side of the top plate. It is pivotally attached to the left and right ends of the rear side. Each of the front and rear guard rods is provided with a locking portion extending in the length direction, and is engaged with the locking portions of the front guard rod so as to be movable in the length direction at the upper ends of the two left and right clue bars. The rear guard rod is provided with an engagement support portion for supporting the front guard rod, and is engaged with the upper end portions of the left and right cue rods on the rear side so as to be movable in the longitudinal direction with the locking portion of the rear guard rod. An engagement support portion is provided to support the. With the above-described configuration, the front and rear guard rods are turned in the standing posture as the two left and right clue rods are rotated between the standing posture and the lying posture. It can be moved up and down between a erection position constructed between the upper ends of the two and a storage position superimposed on the two clue bars in the lying posture.

According to the portable worktable of the present invention, the clue bar is rotatably attached to the left and right end portions of the front and rear side surfaces of the top plate so that it can take a vertically upward standing posture and a horizontal laterally lying posture. Therefore, the clue bar mounting structure can be simplified as compared with the conventional portable work table.
Further, according to the portable work table of the present invention, the front and rear guard rods can be moved up and down between the installation position and the storage position as the clue bar rotates, so The storage operation can be performed safely and easily from the ground without getting on the top board.

  In the portable worktable according to the present invention, the cue rod and the front and rear guard rods are viewed from the horizontal direction in a state where the front and rear guard rods are stacked on the front and rear side cue rods in the lying posture. Sometimes it is preferred that it be within the thickness of the top plate.

By configuring the clue bar and the front and rear guard bars as described above, it is possible to fold the portable worktable to reduce the bulk when storing and transporting, and damage the clue bar and front and rear guard bars during storage and transportation. It is also reduced.
The above configuration can be realized, for example, by appropriately setting the attachment position of the clue bar to the front and rear side surfaces of the top plate, the left and right lateral width of the clue bar, and the vertical width of the front and rear guard bars.

  In the portable worktable according to the present invention, the locking portions of the front and rear guard rods consist of rail portions extending in the length direction, and the engagement support portions of the two left and right clue rods are the rail portions of the front guard rod. It is preferable that the engagement support portion of the two left and right cue rods is formed of a support roller that is movably engaged with the rail portion of the rear guard rod. .

  According to said aspect, since rotation of a clue bar | burr and the raising / lowering of the front-and-back guard bar | burr performed in conjunction with it become smooth, the outstanding operativity is acquired.

  Further, in the portable work table according to the present invention, the left guard rod is installed between the upper ends of the left and right two clue bars, and the upper end portions of the right and front two clue rods are installed. The left guard rod is attached to the upper end portion of one of the two front and rear cue rods on the left side so as to be swingable, and the other end of the left guard rod. The right guard rod is detachably secured to the upper end of either one of the two front and rear clue bars on the left side by fastening means. The other end is detachably attached to the upper end of one of the two front and rear cue bars on the other side by a fastening means. It is preferable.

  If the left and right guard rods as described above are provided in the portable work table, the risk of the operator falling from the top plate is further reduced, and the work can be performed more safely. In addition, the construction of the left and right guard rods can be performed easily.

It is a whole front view which shows the state at the time of use of the portable worktable by this invention. It is the same right view. It is a partial notch front view which expands and shows the attachment part to the top plate of the front right cue stick | rod in a portable worktable. FIG. 4 is a vertical sectional view taken along line IV-IV in FIG. 3. It is a partial notch front view which expands and shows the attachment part to the top plate of the front left cue stick | rod in a portable worktable. FIG. 5 is an enlarged vertical sectional view showing a state in which a front guard bar is overlaid on a cue bar placed in a lying posture on a portable work table. It is a front view which expands and shows the connection part of the front left cue stick | rod and front guard stick | rod in a portable worktable. It is a front view which expands and shows the connection part of the front right cue stick | rod and front guard stick | rod in a portable worktable. It is the same right view. FIG. 9 is a vertical sectional view taken along line XX in FIG. 8. It is a vertical sectional view which expands and shows the length center part of the front guard stick in a portable work bench.

An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the portable work table (1) according to this embodiment is attached to the rectangular top plate (2) and the left and right ends of the top plate (2) when viewed from above. A pair of legs (3), four clue bars (4) standing at the four corners of the top plate (2), and the upper left and right clue bars (4) The front guard rod (5), the rear guard rod (5) installed between the upper ends of the two left and right clue rods (4), and the two front and rear clue rods (4) Left guard rod (6) erected between the upper end portions of the right side and right guard rod (6) erected between the upper end portions of the two front and rear clue rods (4) .

  Each of the left and right legs (3) is a ladder having a pair of front and rear columns (31) and a plurality of step bars (32) horizontally held between the columns (31). The upper end of the column (31) is attached to the left and right ends of the top plate (2) by hinge fittings (33) and can be folded along the lower surface of the top plate (2). The strut (31) of the leg (3) is provided so as to incline in a divergent shape when viewed from the front / rear and left / right directions (see FIGS. 1 and 2). An opening stopper (7) is provided between an intermediate portion of the length of the support (31) of the leg (3) and the lower surface of the top plate (2).

  As shown in FIG. 1, the two left and right clue bars (4) have a top plate (4) so that they can take a vertically upward standing posture and a horizontal lateral lying posture along the front side of the top plate (2). It is rotatably attached to the left and right ends of the front side of 2). In addition, the left and right clue bars (4) on the rear side can be pivoted to the left and right ends of the rear side of the top plate (2) so that they can take the same standing and lying posture as the two on the front side. Is attached.

Each clue bar (4) is made of a hollow material having a substantially square cross section. The lower end portion of the clue bar (4) is attached to the front and rear side surfaces of the top plate (2) via the bracket (8).
As shown in detail in FIGS. 3 and 4, the bracket (8) is joined to and integrated with the bracket body (8a) and the bracket body (8a), and is fixed to the front and rear sides of the top plate (2). Mounting bracket (8b). The bracket body (8a) includes a horizontal bottom wall (81) extending in the left-right direction, a hanging wall (82) extending downward from the left-right outer end of the bottom wall (81), and the bottom wall (81) and the hanging wall. It has a substantially U-shaped cross section having two front and rear side walls (83) and (84) having a substantially inverted L shape when viewed from the front surface connected to both front and rear edges of (82). The mounting bracket (8b) is a base (85) with a U-shaped vertical cross section that is fitted on the front and rear sides of the top plate (2) and secured with bolts (B), and from the left and right ends of the base (85). A projecting portion (86) extending outward, and a mounting portion (87) extending from the tip of the projecting portion (86) in opposite directions to each other and welded to the front-rear inner wall (84) of the bracket body (8a) And. In order to facilitate screwing of the bolt (B), a part of the front and rear side walls (83) and (84) of the bracket body (8a) is cut away.
The lower end of the clue bar (4) is bolted to the front and rear side walls (83) (84) located slightly diagonally above the intersection of the bottom wall (81) and the hanging wall (82) in the bracket body (8a). (B)-It is rotatably attached by a nut (N). The bolt insertion hole (41) provided in the vicinity of the lower end of the front and rear side walls of the clue bar (4) is a long hole extending vertically, and the clue bar (4) is long within the range of the long hole (41). It can be slid in the vertical direction.
Cuts (42) perpendicular to the lower ends of the front and rear side walls of the clue bar (4) are formed, and the pins (9) are inserted across these cuts (42). Then, both ends of the tension coil spring (10) are attached to the bolt (B) and the pin (9).
A notch (88A) into which the pin (9) is inserted into the edge of the bracket body (8a) on the front and rear side walls (83) and (84) located below the bolt (B) and nut (N) vertically and laterally outward. ) (88B). An edge portion between the two notches (88A) and (88B) is formed in an arc shape so as to function as a pin guide portion (89).

  A stopper (11) is provided at the lower part of the bracket body (8a) for holding the clue bar (4) in the vertical standing position at that position. The stopper (11) has a horizontal pin shape and is slidable in the left-right direction on the horizontal horizontal cross-section of the stopper holder (12) joined to the bottom surface of the bottom wall (81) of the bracket body (8a). It is attached. More specifically, the stopper (11) includes a proximal-side small-diameter portion (11a) slidably inserted into a hole formed in the inner wall in the left-right direction of the stopper holder (12), and a stopper holder ( And 12) a distal end large diameter portion (11b) slidably inserted into a hole formed in the laterally outer wall of 12). A ring-shaped knob (13) is attached to the base end of the stopper (11). A compression coil spring (14) is interposed between the annular step of the stopper (11) and the inner wall in the left-right direction of the pin holder (12). The tip of the stopper (11) composed of the large diameter part (11b) is inserted into the through hole formed in the left and right inner wall of the hanging wall (82) of the bracket body (8a) and the clue bar (4) in the standing posture. By being inserted, the clue bar (4) is locked in the standing posture.

When shifting the clue bar (4) from the standing position to the lying position, hold the knob (13) and pull it inward in the left-right direction.The tip of the stopper (11) will move the bracket body (8a) and the clue bar (4). Therefore, the clue bar (4) is slid downward while maintaining this state. By this operation, the pin (9) at the lower end of the clue bar (4) is released from the lower notch (88A) of the front and rear side walls (83), (84) of the bracket body (8a). Rotate to fall inside. At this time, the pin (9) is slid along the pin guide portions (89) of the front and rear side walls (83) and (84) of the bracket body (8a). Then, when the clue bar (4) is in the horizontal and horizontal lying posture, the pin (9) at the lower end of the clue bar (4) is moved by the urging force of the tension coil spring (10) to the front and rear side walls of the bracket body (8a). (83) Fits into the side cutout (88B) of (84), and this state is maintained. In this state, the clue bar (4) is supported by the bottom wall (81) of the bracket body (8a).
On the other hand, when shifting the clue bar (4) from the lying position to the standing position, the pin (9) is notched on the side notch (88B) of the bracket body (8a) when the cue bar (4) is slid outward in the left-right direction. In this state, the clue bar (4) is rotated in the standing direction. When the clue bar (4) is in a vertically upward standing posture, the pin (9) is fitted into the lower notch (88A) of the bracket body (8a) by the biasing force of the tension coil spring (10). Further, the tip of the stopper (11) is fitted into the through holes of the bracket body (8a) and the clue bar (4) by the biasing force of the compression coil spring (14), and this state is maintained.

  Each of the front and rear guard rods (5) is provided with a rail portion (locking portion) (51) extending in the length direction. Each of the front and rear guard rods (5) is made of a material having a lip groove-shaped cross section that opens downward, and an inner portion thereof constitutes a rail portion (51). Caps (52) are attached to both ends of the front and rear guard rods (5).

A support roller (engagement support portion) (15) is provided at the upper end of the left and right clue rods (4) on the front side so as to be able to roll on the rail portion (51) of the front guard rod (5). The support roller (engagement support portion) (15) that is movably engaged with the rail portion (51) of the rear guard rod (5) is attached to the upper ends of the two left and right clue rods (4). Is provided.
The lower part of the roller mounting base (16) in the form of a vertical plate is fitted into a notch formed vertically downward from the upper ends of the left and right side walls of the clue bar (4). The base (16) has a left-right width larger than the left-right width of the clue bar (4), and a part of the base (16) protrudes inside the left-right direction of the clue bar (4). In addition, the base (16) has a front and rear horizontal threaded hole at the bottom, and a bolt (B) and a nut that penetrate the front and rear side walls of the clue bar (4) and are screwed into the threaded hole. (N) is fixed to the upper end of the clue bar (4). The upper part of the base (16) is inserted into the front and rear guard rods (5) through a lower opening. A rotary shaft (17) is attached to the upper corner of the base (16) in the left-right direction so as to penetrate in the front-rear direction, and support rollers (15) are attached to both ends of the rotary shaft (17). The support roller (15) is rolled along the length direction of the upper and lower surfaces of the front and rear guard rods (5).

  As shown in FIG. 11, the front and rear guard rods (5) are each provided with a support roller stopper (18) at the center of the length of the lower surface of the upper wall portion. The stopper (18) is formed of a plate-like body having a required length, and is fixed to the lower surface of the upper wall portion of the front and rear guard rods (5) by bolts and nuts. The left and right end faces of this stopper (18) are in contact with the support rollers (15) at the ends of the two left and right clue bars (4) that are in a horizontal and horizontal position. The front and rear guard rods (5) stacked on the left and right sides of the top plate (2) are regulated to move so as not to protrude from either one of the left and right end surfaces.

  In this embodiment, one end of the left guard rod (6) is swingably attached to the upper end of the left front cue rod (4), and the other end of the left guard rod (6) is attached to the left rear. It is detachably fixed to the upper end of the side cue rod by a fixing means. One end of the right guard rod (6) is swingably attached to the upper end of the right rear clue rod (4), and the other end of the right guard rod (6) is the right front clue. The rod (4) is detachably fixed to the upper end of the rod (4) by fixing means. Details of one end of the left guard rod (6) are shown in FIG. 7, and details of the other end of the right guard rod (6) are shown in FIGS. ) Have the same structure at one end and the other end, and the other ends are not shown.

Each of the left and right guard rods (6) is made of a steel bar whose both ends are bent in an L shape inward in the left-right direction. Each of the left and right guard rods (6) has an outer diameter smaller than the width of the opening so that it can pass through the lower openings of the front and rear guard rods (5).
As shown in FIG. 7, first bent end portions (61) provided at one end portions of the left and right guard rods (6) so as to extend inward in the left-right direction are respectively provided with clue rods (4 ) In the vicinity of the upper end of the left and right side walls. Further, a male screw (61a) is formed at the tip of the first bent end portion (61), and the first bent end portion (61) is formed by a nut (N) screwed into the male screw (61a). It is designed not to fall out of the clue stick (4).
The second bent end (62) provided at the other end of each of the left and right guard rods (6) is shorter than the first bent end (61) by a predetermined length. By inserting this second bent end (62) into the folding locking holes (43) formed in the vicinity of the lower end of the left and right outer walls of the rear left and front right cues (4), Each guard bar (6) is held in a folded position along the cue bar (4) (see FIG. 5). The second bent end (62) inserted into the folding locking hole (43) is bent by pulling the lower part of each of the left and right guard rods (6) outward in the left-right direction. In this state, the left and right guard rods (6) can be rotated to the horizontal installation position.

  The fixing means is the second bent end of each of the left and right guard rods (6) formed at the upper ends of the left and right outer side walls of the clue bars (4) on the rear left side and the front right side and rotated to the horizontal installation position. And a hook (44) for inserting the portion (62), and a hook that is swingably attached to the upper end of the clue bar (4) and is latched at an intermediate position of the length of the clue bar (4). 19). As shown in FIG. 8, the hook (19) is in the form of a vertical plate with its tip side bent downward, and a horizontal through hole is formed in the middle of its length. A ring-shaped spacer (S) having a thickness larger than that of the hook (19) is interposed between the head of the bolt (B) and the inner wall in the front-rear direction of the clue bar (4). Then, the ring-shaped spacer (S) is loosely fitted into the horizontal through hole of the hook (19), so that the hook (19) is swingable. A substantially semicircular arc-shaped notch (191) is formed at the tip of the hook (19), and this notch (191) is hooked on the left and right guard rods (6) from above, Each guard rod (6) is held in a horizontal installation position. The rear end of the hook (19) is engaged with the left and right inner walls of the clue bar (4) at the swing position where the notch (191) part is disengaged from the left and right guard bars (6). Is formed with an L-shaped bent stopper portion (192) that prevents further swinging of).

In the portable worktable (1) having the above-described configuration, when storing and transporting the portable worktable (1), the pair of legs (3) are folded along the lower surface of the top plate (2). . Further, the four clue bars (4) are turned 90 ° from the vertical standing posture to be in a horizontal lateral lying posture (see FIG. 6). Each of the front and rear guard rods (5) is arranged at a receiving position where it is superimposed on the two left and right clue rods (4) on the front side and the rear side (see FIG. 6). The left and right guard rods (6) are held at the folding positions along the cue rods (4), and the rail portions (51) in the guard rods (5) are opened through the lower openings of the front and rear guard rods (5). ) (See FIG. 6). In this state, when the portable work table (1) is viewed from the horizontal direction, the clue bar (4) and the front and rear guard bars (5) are within the thickness of the top plate (2) (see FIG. 6). ).
When the portable workbench (1) is brought into the work site and used, for example, the pair of folded legs (3) is first rotated to be in an open leg state. Next, when the two left and right clue bars (4) on the front and rear sides are rotated to the vertical standing posture, the front and rear guard bars (5) are raised to the installation position. This operation can be performed from the ground without the operator getting on the top board (2). Finally, the worker climbs the ladder-like leg (3) and gets on the top plate (2), and the left and right guard rods (6) in the folding position along either one of the front and rear cue rods (4). Pull the lower part outward in the left-right direction to remove the second bent end (62) from the folding locking hole (43), then rotate it to the horizontal installation position, and move the second bent end (62) forward or backward. The other clue bar (4) is inserted into the installation locking hole (44), and the left and right guard bars (6) are hooked with hooks (19). Through the series of operations described above, the upper space of the top plate (2) is surrounded by the front, rear, left and right guard rods (5) and (6), so that the worker can safely work in this state. Further, when the portable work table (1) is folded and carried out, an operation reverse to the above may be performed.

  As described above, according to the portable worktable (1) of this embodiment, the cue rod (4) can be placed in front of and behind the top plate (2) so that it can take a vertically upward standing posture and a horizontal laterally lying posture. Since it is pivotally attached to the left and right end portions of the side surface, the clue bar attachment structure is simplified compared to the conventional portable work table, thereby reducing the cost. Further, according to the portable workbench (1) described above, the front and rear guard rod (5) can be smoothly raised and lowered between the installation position and the storage position as the clue bar (4) rotates. The guard rod (5) can be installed and stored safely and easily from the ground. Furthermore, when viewed from the horizontal direction with the front and rear guard rods (5) overlaid on the cue rod (4) in the lying position, the cue rod (4) and the front and rear guard rods (5) ), The portable work table (1) can be folded and stored and transported in a small volume, and the clue bar (4) and front and rear guard bars (5) can be stored and transported. Is less likely to be damaged.

  It should be noted that the above-described embodiment is merely an example, and it is of course possible to implement the present invention in a form appropriately modified within the scope not departing from the gist described in the claims.

(1): Portable worktable
(2): Top plate
(3): Leg
(4): Cue stick
(44): Locking hole for installation (fastening means)
(5): Front guard rod, rear guard rod
(51): Rail part (locking part)
(6): Left guard rod, right guard rod
(15): Support roller (engagement support part)
(19): Hook (fastening means)

Claims (4)

A rectangular top plate as seen from the plane, a pair of legs attached to the left and right ends of the top plate, four clue sticks standing at the four corners of the top board, and two left and right clue sticks In a portable workbench comprising a front guard bar erected between upper end parts and a rear guard bar erected between upper end parts of two left and right clue bars,
The left and right clue bars on the front side are pivotally attached to the left and right ends of the front side of the top plate so that they can take a vertically upward standing posture and a horizontal lateral lying posture along the front side of the top plate. The left and right clue bars on the rear side are pivotally attached to the left and right ends of the rear side of the top plate so that they can take an upright standing posture and a horizontal lying down posture along the rear side of the top plate. And
Each of the front and rear guard rods is provided with a locking portion extending in the length direction, while the front left and right clue rods are engaged with the front guard rod locking portions so as to be movable in the length direction. Engagement support for supporting the guard rod is provided, and the rear guard rod is supported by the upper end of the two left and right clue rods so as to be movable in the longitudinal direction by the locking portion of the rear guard rod. An engagement support is provided,
As the two left and right cue rods on the front and rear sides are rotated between the standing posture and the lying posture, the front and rear guard rods are placed between the upper end portions of the two clue rods in the standing posture. A portable work table, wherein the portable work table is moved up and down between a erected position and a stowed position stacked on a clue bar in a lying position.   The cue bar and front and rear guard rods fit within the thickness of the top plate when viewed from the horizontal direction with the front and rear guard rods superimposed on the left and right cue rods on the left and right sides, respectively. The portable workbench according to claim 1, characterized in that the portable workbench is configured to be a solid one.   The front and rear guard rod locking portions consist of rail portions extending in the length direction, and the support support portions of the front left and right cue rods are slidably engaged with the rail portions of the front guard rod. 3. A support roller comprising a roller, wherein the engagement support portion of the left and right cue rods on the rear side is a support roller that is slidably engaged with a rail portion of the rear guard rod. Portable workbench. It further includes a left guard rod erected between the upper ends of the two left and right clue rods, and a right guard rod erected between the upper ends of the two right and left clue rods. ,
One end of the left guard rod is swingably attached to the upper end of one of the two left and right clue rods, and the other end of the left front and rear two clue rods The right guard bar is detachably fixed to one of the other upper ends by a fixing means, and one end of the right guard bar is swingable to either one of the two front and rear clue bars. The other end is fixedly attached to the upper end of one of the two front and rear cue rods on the other side by a fixing means, and is detachably attached thereto. The portable worktable as described in any one of these.

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