JP5371650B2 - Portable worktable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable workbench which can prevent or reduce damage to a workbench body and a hand hold bar when the workbench is overturned. <P>SOLUTION: In this portable workbench, leg bodies 2 and 2 are provided at both ends of a top plate 1, and provided with the hand hold bars 5 protruding above the top plate 1, respectively. The hand hold bar 5 is pivoted on a mounting bracket 6 fixed to an upper end of a leg column 2a via a spacer fitting 7, in such a manner as to enable an attitude to be changed between the rising attitude of protruding above the top plate 1 and the folded attitude of being folded along the leg column 2a. The hand hold bar 5 can be fixed in each of the rising and folded attitudes. The spacer fitting 7 is composed of a self-breaking member which is actively formed with strength lower than the mounting bracket 6, while having strength high enough to bear a load applied to the mounting bracket 6 when the hand hold bar 5 is used in the rising attitude, and which is broken in the overturning of the workbench so as to relax an impact received by the hand hold bar 5 and the workbench body T. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a work table used when working in a relatively high place such as interior finishing of a ceiling, wiring in a ceiling, piping, etc. at a construction site of a building, and in particular, legs at front and rear ends of a top plate. Is provided so that it can be folded, and each leg is composed of a pair of left and right pedestals and a step pedestal horizontally mounted between both pedestals, and the leg is provided with a clue bar protruding above the top plate. The present invention relates to a portable work table.

  Conventionally, as this type of work table, there is one described in Patent Document 1 below. In this workbench, the clue bar has a standing posture that projects upward from the top plate to a mounting bracket that is fixed to the upper end of the pedestal via a wedge-shaped bracket, and a folding posture that is folded along the pedestal. And can be fixed in a standing posture and a folded posture.

JP 2002-129744 A

  In the workbench described in Patent Document 1, the clue bar is attached to the mounting bracket via a wedge-shaped bracket. This bracket is a sturdy bracket having mechanical strength equivalent to that of the mounting bracket. Therefore, when the work table rolls over, for example, on the ground, the clue bar first receives an impact force, and the impact force is directly transmitted to the work table main body via the bracket. Then, the clue bar that receives the impact force at the time of rollover is damaged by the impact force, and the impact force reaches the worktable body side as it is. There is a problem that it is very expensive.

  In view of the above problems, an object of the present invention is to provide a portable work table that can prevent or reduce damage to the work table main body and the clue bar when the work table rolls over.

Means for solving the above problems will be described with reference numerals in the embodiments described later. The portable work table according to the first aspect of the present invention has legs 2, 2 at both front and rear ends of the top plate 1. Each leg 2 is composed of a pair of left and right leg posts 2a, 2a and a step rail 2b laid between the two leg posts 2a, 2a. In the portable work table provided with the protruding clasp bar 5, the clasp bar 5 stands upright above the top plate 1 on the mounting bracket 6 fixed to the upper end portion of the pedestal 2 a via the spacer bracket 7. The spacer bracket 7 is pivotally attached to the posture and the folding posture folded along the pedestal 2a so that the posture can be changed, and can be fixed in the standing posture and the folding posture. And an upper plate portion 7b and a lower plate portion 7c that connect the work table body T, The upper and lower plate portions 7b and 7c of the spacer bracket 7 are formed with weaker strength than the bracket 6 and the impact load of the clasp bar 5 and the platform body T is applied to the spacer bracket 7 via the mounting bracket 6 when the platform rolls over. It is characterized by being received only by .

  A second aspect of the present invention is the portable work platform according to the first aspect, wherein the pivot shaft 11 of the clasp bar 5 penetrates the clasp bar 5 in the left-right direction and penetrates both side plates 6a, 6b of the mounting bracket 6. The work table rolls over at the outer end of the pivot shaft 11 that protrudes to the outside of the side plate 6b opposite to the side plate 6a adjacent to the leg column 2a of the side plates 6a, 6b of the mounting bracket 6. A cushion member 17 for absorbing the impact received by the pivot shaft 11 is attached.

The effect of the invention by the above-described solution means will be described with reference numerals of embodiments described later. According to the workbench of the invention according to claim 1, the spacer fitting 7 uses the clue bar 5 in an upright posture. It has a strength sufficient to withstand the load applied to the mounting bracket 6 at the time, but is actively formed to be weaker than the mounting bracket 6 and breaks when the work table rolls over, and the clue bar 5 and the work table Since the work table is made of a self-damaging member that reduces the impact received by the main body T, for example, when the work table rolls over the ground, the spacer metal fitting 7 on the side facing the ground is the upper plate portion that connects the attachment metal fitting 6 and the work table main body T. 7b and lower plate portion 7c, and is formed to be weaker than the mounting bracket 6, and when the work table rolls over, the spacers are applied with the impact load of the clue bar 5 and the work table main body T via the mounting bracket 6. In front of bracket 7 Since it is received only by the upper and lower plate portions 7b and 7c, when the work table rolls over, as shown in FIG. 11 (b), the spacer metal fitting 7 on the side facing the ground GL is attached to the mounting metal fitting attached thereto. Since the strength is lower than 6, the upper plate portion 7b and the lower plate portion 7c are each bent and deformed (or may be crushed and cut) when the mounting bracket 6 collides with the ground GL. The mounting bracket 6 that directly collides with the ground and the clue bar 5 attached to the mounting bracket 6 that directly collides with the ground due to the self-breaking of the spacer bracket 7 will be damaged and the damage will be prevented. The damage is reduced, and the impact received by the worktable body T due to the self-breakage of the spacer metal fitting 7 is mitigated, and the worktable body T is prevented from being damaged or reduced. Therefore, even if the spacer metal fitting 7 is broken, if only the spacer metal fitting 7 is replaced with a new one, the clue bar 5 and the worktable body T can be used as they are, which is very economical. When the spacer fitting 7 is integrally formed with the attachment fitting 6 by welding or the like, the spacer fitting 7 and the attachment fitting 6 may be replaced with new ones.

  According to the second aspect of the present invention, the left and right side walls 6a and 6b of the mounting bracket 6 are passed through the lower end portion 5a of the rectangular tube-shaped clue bar 5 in the left-right direction. Since the cushion member 17 is attached to the outer end portion of the pivot shaft 11 that passes through the side wall 6a opposite to the side adjacent to the pillar 2a of the both side walls 6a, 6b, the work table body is provided by the cushion member 17. It is possible to alleviate the impact received by the worktable body T and the clue bar 5 when T rolls over, and to effectively prevent or reduce damage to the worktable body T and the clue bar 5.

It is a front view of the work table concerning the present invention. It is a side view of the work bench. It is a perspective view which shows the state by which the clue stick is being fixed to the standing posture. It is a perspective view which shows the state by which the clue stick is being fixed to the folding posture. It is an enlarged side view of the attachment part of the clue bar lower end part by an attachment metal fitting. It is an enlarged front view of the attachment part of the clue bar lower end part by an attachment metal fitting. (a) is a plan view showing a state where the lock pin is locked, and (b) is a plan view showing a state where the lock pin is unlocked. (a) is a front view showing a method of attaching the spacer bracket to the mounting bracket, and (b) is a front view of the state where the spacer bracket is attached to the mounting bracket. 8A is a sectional view taken along line XX of FIG. 8A, FIG. 8B is a sectional view taken along line YY of FIG. 8A, and FIG. 8C is an enlarged sectional view taken along line ZZ of FIG. FIG. (a) is a side view of the workbench in a state where the clue bar is fixed at the folding position, and (b) is a side view showing a state in which the workbench rolls over. (a) is an enlarged view of a portion indicated by an arrow W in (a) of FIG. 10, and (b) is a drawing showing a state (a) when the work table rolls over.

  A preferred embodiment of the present invention will be described below with reference to the drawings. In the workbench shown in FIGS. 1 and 2, T is a workbench main body, and ladder-like legs 2 are provided at the left and right ends of the top plate 1. , 2 are not shown in the figure through the rotary fitting 3, but are closed so that they are parallel to the lower surface of the top plate 1, and are in a stand-up state in which they stand up as if they are inclined downwardly as shown in FIG. A stay 4 is provided between the top plate 1 and each leg 2 so as to be able to be bent. As shown in FIG. 2, each leg 2 is composed of a pair of left and right leg pillars 2a and 2a arranged in a downwardly extending manner, and a step rail 2b horizontally mounted in a plurality of stages between both leg pillars 2a and 2a. The clasp bar 5 is mounted on the mounting bracket fixed to the upper end of each pedestal 2a via a spacer bracket, and the clasp bar 5 is in a standing posture in which it protrudes upward from the top plate and in a folding posture in which it is folded along the pedestal. It is pivotally attached so that it can be changed.

  As shown in FIGS. 2 to 5, the mounting bracket 6 is fixed to the upper end of the pedestal 2 a via a spacer bracket 7. In this case, the left and right pedestals 2a, 2a forming the leg 2 are arranged so as to extend downward, and the respective pedestals 2a are inclined at a certain angle. Therefore, as shown in FIG. The attachment bracket 6 is attached to the pedestal 2a at a predetermined angle via the bracket 7, and the lower end portion 5a of the clasp bar 5 is formed to be inclined at a predetermined angle with respect to the upper portion thereof. Projection and extension can be performed in a standing posture above the top plate 1.

  As shown in FIG. 3 to FIG. 6, the mounting bracket 6 is formed so that the side plates 6 a, 6 b and the back plate 6 c form a groove portion 8 having a substantially square shape in side view and extending in the vertical direction. It is attached to the pedestal 2a via a spacer fitting 7. Pin end side lock holes 9a, 9b are provided at the upper and lower ends of one side plate 6a (side plate 6a adjacent to the column 2a) forming the groove 8, and the opposite side plate 6b (leg column 2a). A part of the upper end of the side plate 6b far from the side plate is cut off (the cut portion is indicated by Sa), and a semi-circular pin engaging portion 10a is formed at a portion facing the lock hole 9a. Similarly, a part of the upper end portion of 6b is cut away (the cut portion is indicated by Sb), and a semicircular pin engaging portion 10b is formed at a portion facing the lock hole 9b.

The spacer bracket 7 has a strength sufficient to withstand the load applied to the mounting bracket 6 when the clue bar 5 is used in a standing posture, but is actively formed to have a weaker strength than the mounting bracket 6. It is composed of a self-breaking member that is damaged when the workbench rolls over and alleviates the impact of the cue stick 5 and the workbench. For example, as shown in FIGS. 5 and 8 (a), (b), A steel plate (e.g., 1.6 mm thick) thinner than a steel plate (e.g., 2.3 mm) that forms the mounting bracket 6 is bent to form a back plate portion 7a, an upper plate portion 7b, a lower plate portion 7c, a flange 7d on projecting from the plate portion 7b downwardly, that to form a lower flange 7e projecting downwardly from the lower plate portion 7c.

  After the spacer metal fitting 7 is attached to one side plate 6a of the attachment metal fitting 6 as shown in FIGS. 8A and 8B, it is attached to the upper end of the leg 2a of the leg 2 as shown in FIG. It is attached. First, when attaching the spacer metal fitting 7 to the attachment metal fitting 6, as shown in FIG. 8 (a), a plurality of nuts 31 are attached to the upper and lower flanges 7d and 7e of the spacer metal fitting 7 by caulking. As shown in FIG. 9 (a), the side plate 6a is provided with a flat head bolt insertion hole 32 at a location corresponding to the nut 31, and the side plate 6b of the mounting bracket 6 is shown in FIG. 9 (b). A hexagon wrench insertion hole 33 is provided at a required location. Then, as shown in FIG. 8 (a), the upper and lower flanges 7d and 7e of the spacer fitting 7 are brought into contact with the side plate 6a of the mounting bracket 6 and inserted from the wrench insertion holes 33 of the side plate 6b of the mounting bracket 6. 30, the hexagon socket head bolt 34 is screwed into the caulking nut 31 of the upper and lower flanges 7 d, 7 e of the spacer bracket 7 from the flat head bolt insertion hole 32 of the side plate 6 a, thereby removing the spacer bracket 7 as shown in FIG. It can be attached to the side plate 6 a of the mounting bracket 6. 8 and 9, reference numeral 35 denotes a pivot shaft through hole. The fixing means is not limited to the Sarah head bolt, but may be a bolt or other fixing means. The spacer metal fitting 7 and the attachment metal fitting 6 may be integrally fixed by fixing means such as welding.

  In order to attach the spacer fitting 7 thus attached to the side plate 6a of the attachment fitting 6 to the upper end of the pedestal 2a, a nut 22 is attached to a required portion of the back plate portion 7a of the spacer fitting 7 as shown in FIG. Then, from the inside of the pedestal 2a, the bolt 21 is passed through the bolt insertion hole 20 passing through the pedestal 2a, the rotary fitting 3 and the spacer fitting 7 and screwed into the nut 22 of the spacer fitting 7 to thereby attach the spacer fitting 7 to the pedestal. 2a can be attached.

  In the groove portion 8 formed in the mounting bracket 6, the lower end 5 o of the clasp bar 5 is pivotally attached to the center portion in the vertical direction so as to be rotatable in the vertical direction by the pivot shaft 11. The lower end portion 5a of the clasp bar 5 protruding in an upright position above the top plate 1 is fitted as shown in FIGS. 3, 5 and 6, and the lower half B of the groove portion 8 is shown by the solid line in FIG. And the lower end part 5a of the clue bar 5 reversed from the standing posture and folded along the pedestal 2a as shown in phantom lines in FIG. 6 is fitted.

  As shown in FIGS. 3 to 7, a lock pin 12 having a substantially U-shaped handle 23 formed on the proximal end side of the pin forms a rectangular tube-shaped clue bar 5 at the lower end portion 5 a of the clasp bar 5. The lock pin 12 is slidably passed through the left and right side walls m, n. The coil pin 14 is interposed between the lock pin 12 and the clasp bar 5 so that the pin tip portion 12a is a pin at the upper end portion and the lower end portion of the mounting bracket side plate 6a. It is biased in a direction to enter the distal end side lock holes 9a, 9b. Accordingly, with the lower end portion 5a of the clue bar 5 fitted in the upper half A of the groove portion 8 as shown in FIG. 3, the pin tip portion 12a is inserted into the pin tip side lock hole 9a at the upper end portion of the side plate 6a. As a result, the clasp bar 5 is fixed in an upright position, and the lock pin 12 is unlocked by pulling the handle 23 toward the front side against the biasing force of the coil spring 14, and the clasp bar 5 is rotated downward in this state. The lower end portion 5a is fitted into the lower half B of the groove portion 8, and the pin end portion 12a is inserted into the pin end side lock hole 9b at the lower end portion of the side plate 6a to fix the clue bar 5 in the folded position. Can do.

  Further, as shown in FIGS. 3, 4, 6 and 7, pin base end side lock holes 24a and 25a into which the front end portion 12b of the U-shaped handle 23 on the base end side of the lock pin 12 enters are formed. The attached pieces 24 and 25 are attached to the upper and lower ends of the side plate 6 b that forms the groove 8 of the attachment fitting 6. In this case, as can be seen from FIG. 7, the upper and lower mounting pieces 24, 25 are fixed to the upper and lower ends of the back plate 6c by welding, for example, in a state flush with the side plate 6b.

  Therefore, in the state where the lower end portion 5a of the clasp bar 5 is fitted in the upper half A of the groove portion 8, the pin tip portion 12a enters the pin tip side lock hole 9a at the upper end portion of the side plate 6a and the U-shaped handle 23 is inserted. By inserting the front end portion 12b into the pin base end side lock hole 24a on the upper end portion side of the side plate 6b, the clue bar 5 can be stably and firmly fixed in a standing posture. In addition, with the lower end portion 5a of the clasp bar 5 fitted into the lower half B of the groove portion 8, the pin tip portion 12a enters the pin tip side lock hole 9b at the lower end portion of the side plate 6a and the U-shaped handle 23 By inserting the distal end portion 12b into the pin base end side lock hole 25a on the lower end portion side of the side plate 6b, the clue bar 5 can be stably and firmly fixed in the upright posture.

  The upper end portion of the side plate 6b forming the groove portion 8 of the mounting bracket 6 is partially cut away, and the cut portion Sa is locked when the lower end portion 5a of the clasp bar 5 is fitted to the upper half A of the groove portion 8. A semi-circular pin engaging portion 10a with which the proximal end side of the pin 12 is engaged is formed, and the upper end portion of the same side plate 6b is also partially cut off in the same manner. A semi-circular pin engaging portion 10b is formed that engages the proximal end side of the lock pin 12 when the portion 5a is fitted into the lower half B of the groove portion 8. In the upper end side cut-off portion Sa, when the clasp bar 5 fitted in the upper half A of the groove 8 is rotated downward, the base end side of the lock pin 12 that pivots together with the clasp bar 5 is smooth from the upper end of the side plate 6b. The bottom cut-out portion Sb is formed so that the base end side of the lock pin 12 is the bottom end of the side plate 6b when the clasp bar 5 fitted to the lower half B of the groove 8 is rotated upward. So that you can get out of it smoothly.

  As shown in FIGS. 7A and 7B, the coil spring 14 is fitted into the lock pin 12 and attached to the distal end side of the lock pin 12, and the side wall m of the clasp bar 5. The lock pin 12 is urged by the urging force of the spring 14 in a direction to enter the pin tip side lock holes 9 a and 9 b of the mounting bracket 6.

  Further, the pivot shaft 11 which pivotally attaches the lower end 5o of the clue bar 5 to the mounting bracket 6 so as to be rotatable in the vertical direction is composed of a bolt, and as shown in FIG. , N and the side plates 6a and 6b of the mounting bracket 6 (through holes of the side plates 6a and 6b are indicated by 35 in FIGS. 8 and 9). , 6b, a cushion member 17 made of an elastic material such as synthetic rubber is provided on the bolt head 11a projecting outside the side plate 6a on the side opposite to the side plate 6a on the side adjacent to the pedestal 2a. It is attached so as to cover the outer end of the. By attaching this cushion member 17 to the outer end of the pivot shaft 11 so as to cover it, it is possible to reduce the impact received by the work table when the work table rolls over and to prevent the work table from being damaged. it can. A nut 18 is screwed to the distal end portion of the pivot shaft 11 that protrudes from the side plate 6a adjacent to the pillar 2a.

Next, the usage method of the clue bar 5 mentioned above is demonstrated.
First, as shown in FIG. 4, the lock pin 12 resists the urging force of the coil spring 14 from the state in which the clasp bar 5 is fitted into the lower half B of the groove 8 of the mounting bracket 6 and the lock pin 12 is locked. The front end portion 12a of the pin 23a is pulled out from the pin front end side lock hole 9b at the lower end of the side plate 6a, and the front end portion 12b of the handle 23 is pulled out from the pin base end side lock hole 25a. The clasp bar 5 is unlocked, and the clasp bar 5 is rotated upward about the pivot shaft 11 in the unlocked state as shown in FIG.

  In the unlocked state as described above, the lock pin 5 is rotated upward about the pivot shaft 11 and its lower end portion 5a is fitted to the upper half A of the groove portion 8, and then the lock pin that has been pulled up to that point. While loosening the handle 23 of the pin 12, the pin distal end portion 12a is inserted into the pin distal end side lock hole 9a at the upper end portion of the side plate 6a, and the tip end portion 12b of the handle 23 is inserted into the pin proximal end side lock hole at the upper end portion side of the side plate 6b. The clue bar 5 is fixed in an upright posture by rushing into 24a. This state is shown in FIGS.

  When storing the clasp bar 5, the handle 23 of the lock pin 12 is pulled toward the front side against the biasing force of the coil spring 14 from the state shown by the solid lines in FIGS. 3 and 6, and the pin tip 12a is moved to the side plate 6a. Pull out the pin distal end side lock hole 9a at the upper end and pull out the distal end portion 12b of the handle 23 from the pin base end side lock hole 24a to unlock the clasp bar 5 in the upright position. The clasp bar 5 is rotated downward about the shaft 11, the lower end portion 5a is fitted into the lower half B of the groove portion 8, and the pin distal end portion 12a of the side plate 6a is loosened while the handle 23 of the lock pin 12 is loosened. The clasp bar 5 is fixed in an upright position by causing the tip end portion 12b of the handle 23 to enter the pin base end side lock hole 25a on the lower end portion side of the side plate 6b. That.

  FIG. 10 (a) shows a work table in which the clue bar 5 provided on the pedestal 2a of each leg 2 is fixed in the folded position, and FIG. 10 (b) shows the work table in the state (a). 11 (a) is an enlarged view of the portion indicated by the arrow W in FIG. 10 (a), and FIG. 11 (b) shows the state (a) when the work table rolls over. . When the work table rolls over as shown in FIG. 10 (b), as shown in FIG. 11 (b), the spacer fitting 7 on the side facing the ground GL is stronger than the attachment fitting 6 attached thereto. Therefore, when the mounting bracket 6 collides with the ground GL, the upper plate portion 7b and the lower plate portion 7c are each bent and deformed (or sometimes crushed and cut), that is, self-damaged. Become.

  Due to the self-breakage of the spacer fitting 7, the attachment fitting 6 that directly collides with the ground GL and the clue bar 5 attached to the lower end thereof are alleviated from the impact with the ground GL, and thus the damage is avoided. Damage will be reduced as much as possible. Further, due to the self-breakage of the spacer fitting 7, the impact received by the workbench main body T is alleviated, and the workbench main body T is prevented from being damaged, or the damage is reduced as much as possible.

  At this time, the cushion member 17 is attached to the bolt head 11a that protrudes to the outside of the side plate 6b on the side that directly collides with the ground GL among the both side plates 6a, 6b of the mounting bracket 6. As a result, the shock received by the mounting bracket 6 is absorbed and relaxed, whereby damage to the clue bar 5 and the workbench main body T can be effectively prevented or reduced.

  When the spacer metal fitting 7 is crushed and self-damaged as described above, the bolts 34 attaching the upper and lower flanges 7d, 7e of the spacer metal fitting 7 to the side plate 6a of the attachment metal fitting 6 are removed as shown in FIG. The clasp bar 5 can be easily reattached by removing the bolt 21 fixing the back plate portion 7a of the spacer fitting 7 to the side of the pedestal 2a and attaching a new spacer fitting 7 as shown in FIG. Therefore, even if the spacer bracket 7 is damaged, if only the spacer bracket 7 is replaced with a new one, the clue bar 5 and the workbench main body T can be used as they are, which is extremely economical. When the spacer bracket 7 and the mounting bracket 6 are fixed integrally by welding or the like, the spacer bracket 7 and the mounting bracket 6 integral with the spacer bracket 7 are removed from the worktable body T and the clasp bar 5, and a new one is obtained. You can replace it with

T Worktable body 1 Top plate 2 Leg 2a Leg column 5 Cage rod 5a Lower end 6 of the cue rod Mounting bracket 6a, 6b Mounting bracket side plate 7 Spacer bracket 7a Spacer bracket back plate 7b Spacer bracket upper plate 7c Lower plate portions 7d and 7e of the spacer bracket Vertical flange portion 11 of the spacer bracket 11 Pivot shaft 17 Cushion member

Claims (2)

Legs are provided at the front and rear ends of the top plate so that the legs can be folded. Each leg consists of a pair of left and right pedestals and a step pedestal that lies horizontally between the two pedestals. In a portable worktable equipped with a bar, the clue bar is folded up along the pedestal and a standing posture that protrudes above the top plate to a mounting bracket that is fixed to the upper end of the pedestal via a spacer bracket. It is pivotally attached to the folding position so that the posture can be changed, and can be fixed in the standing position and the folding position, respectively, and the spacer bracket includes an upper plate portion and a lower plate portion that connect the mounting bracket and the worktable body. It is formed with weaker strength than the mounting bracket, and when the work table rolls over, the impact load of the clue bar and the work table body is applied only to the upper and lower plate portions of the spacer bracket via the mounting bracket. characterized by being adapted to receive the Transportable workbench.   The pivot shaft of the clasp bar penetrates the clasp bar in the left-right direction and penetrates both side plates of the mounting bracket. Of the side plates of the mounting bracket, the side plate on the opposite side of the side plate adjacent to the leg pillar The portable worktable according to claim 1, wherein a cushion member for absorbing an impact received by the pivotal shaft when the worktable rolls over is attached to an outer end portion of the pivotal shaft protruding outward.

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