JP4639170B2 - Workbench - Google Patents

Description

  The present invention relates to a work table used when performing work in a relatively high place such as interior finishing of a ceiling, wiring, piping work, etc. in a construction site of a building such as a building.

  In a construction site such as a building, interior finishing and wiring work are performed after building a housing. In that case, a work table is often used for finishing work and wiring work in a high place such as a ceiling. Conventionally, as this type of work table, for example, there is one described in Patent Document 1 below.

The workbench described in Patent Document 1 is composed of a stage portion for performing work and a pair of front and rear legs that are foldable at the front and rear end portions of the stage portion. It is opened to stand up to the use position, and is folded into the storage position when not in use, and the legs of the work table can be expanded and contracted according to the work height.
Japanese Patent Laid-Open No. 3-13662

  In the above conventional workbench, the leg can be extended when the working height is high during use, and can be accommodated compactly by contracting and folding the leg when not in use. Therefore, there is a fatal drawback that the front and rear legs are not sufficiently rigid during use, and thus have instability.

  In view of the above problems, an object of the present invention is to provide a work table in which a leg body in use has a sufficient reinforcing structure to improve stability during use.

Means for solving the above-described problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is a stage portion 1 for performing work, and is folded at the front and rear end portions of the stage portion 1. A workbench comprising a pair of front and rear legs 2 and 3 that can be provided, wherein each leg 2 and 3 is pivotally attached to the stage part 1 and the first leg part. In the workbench configured to be extendable and adjustable by the second leg portion 5 that is connected to 4 in a stretchable manner and can be fixed at a required stretchable position,
Between the first leg 4 side of the front leg 2 and the second leg 5 of the rear leg 3, and the first leg 4 side of the rear leg 3 and the second leg of the front leg 2. 5 between a pair of breath members 6a and 6b, which are fitted to each other so as to be stretchable and can be fixed at required stretch positions, and are attached to end portions 6ao and 6bo of the brace members 6a and 6b. Is pivotally attached to the required mounting portion, and a reinforcing rod 7 is provided between the central portion on the lower surface side of the stage portion 1 and the first leg portion 4 of the front leg 2 and the first leg portion 4 of the rear leg 3, respectively. 8 is pivotally connected, and a joint device 9 for folding the reinforcing rods 7 and 8 in half is provided in the longitudinal direction of each reinforcing rod 7 and 8 .

  According to a second aspect of the present invention, in the workbench according to the first aspect, the attachment end portion 6ao of one of the pair of breath members 6a and 6b constituting each of the brace 6 is fixed to the required mounting portion. The attachment end portion 6bo of the other brace member 6b is pivotally attached to the required attachment portion so as to be removable.

  According to a third aspect of the present invention, in the workbench according to the first or second aspect, the height adjustable outriggers 12, 12 are detachably attached to the left and right sides of the front and rear legs 2, 3, respectively. To do.

The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. The work table of the invention according to claim 1 includes the first leg 4 and the rear leg 3 of the front leg 2. Between the second leg 5 and between the first leg 4 of the rear leg 3 and the second leg 5 of the front leg 2 so as to be extendable and contracted to each other. The brace 6 composed of a pair of brace members 6a and 6b that can be fixed in place is spanned, and the mounting end portions 6ao and 6bo of the brace members 6a and 6b are pivotally attached to the required mounting portions. Since the front and rear legs 2 and 3 are sufficiently reinforced by the braces 6 and 6 spanned between the front legs 2 and 3, the work can be performed in a stable state. Reinforcing rods 7 and 8 are pivotally connected between the center of the lower surface side of the stage 1 and the first leg 4 of the front leg 2 and the first leg 4 of the rear leg 3, respectively. Since the joint device 9 for folding the reinforcing rods 7 and 8 in half in the longitudinal direction of the reinforcing rods 7 and 8 is provided, both the front and rear legs are provided by the reinforcing rods 7 and 8 in addition to the braces 6 and 6. 2 and 3 will be reinforced, so that the work can be performed in a more stable state.

  Then, when adjusting the height of each leg 2, 3 by extending or contracting the second leg 5 of each leg 2, 3 relative to the first leg 4, the brace members 6 a, 6 b of each brace 6 are If it can be expanded and contracted, the brace members 6a and 6b expand and contract in conjunction with the expansion and contraction of the second leg 5 with respect to the first leg 4, so the brace 6 remains attached to the front and rear legs 2 and 3. The height adjustment of the legs 2 and 3 can be easily performed.

  In the worktable of the invention according to claim 2, the attachment end 6ao of one of the pair of breath members 6a, 6b of each brace 6 is fixedly pivoted to the required attachment portion, and the other Since the attachment end portion 6bo of the breath member 6b is pivotally attached to the required attachment portion, when the front and rear legs 2, 3 are folded to the lower surface side of the stage portion 1, the attachment end of the other breath member 6b is attached. By removing the part 6bo from the leg parts 4 and 5 of the leg bodies 2 and 3, the brace 6 can be folded together with the leg bodies 2 and 3 to the lower surface side of the stage part 1.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a worktable according to the present invention, FIG. 2 is a plan view of the worktable, and FIG. It is. The work table includes a stage portion 1 on which an operator works, and a pair of front and rear legs 2 and 3 that are foldably provided at the front and rear ends of the stage portion 1. 3 is adjustable by expansion and contraction by a first leg 4 pivotally attached to the stage 1 and a second leg 5 that is connected to the first leg 4 so as to be extendable and fixable at a required expansion / contraction position. It is configured.

  Between the first leg 4 of the front leg 2 and the second leg 5 of the rear leg 3, and the first leg 4 of the rear leg 3 and the second leg 5 of the front leg 2. Between the two, a brace 6 composed of a pair of brace members 6a and 6b that can be fitted to each other so as to be stretchable and connectable at a desired stretched position is spanned. Reinforcing rods 7 and 8 are pivotally connected between the front leg 2 and the rear leg 3, respectively, and the reinforcing rods 7 and 8 are attached to the middle portions of the reinforcing rods 7 and 8 in the longitudinal direction. A joint device 9 for folding in half is provided.

  A handrail 10 is installed around the stage portion 1, and a well-known telescopic ladder 11 is hung on the front end portion of the stage portion 1, and as shown in FIG. 2 and FIG. 3, the outriggers 12 whose heights can be adjusted are detachably attached to both the left and right sides.

  The structure of the work table will be described in more detail. The stage portion 1 is formed by attaching a peripheral frame 1b made of an aluminum mold or the like to a peripheral portion of a rectangular top plate 1a made of an aluminum plate or expanded metal ( (See (b) of FIG. 4). Mounting brackets 13 are fixed to the four corners on the lower surface side of the stage portion 1, and reinforcing bars 15 are provided between the two front mounting brackets 13 and 13 and the two rear mounting brackets 14 and 14, respectively. It is bridged (see Fig. 3).

  The upper brackets 13 and 13 are pivotally attached to the front mounting brackets 13 and 13 so that the upper ends of the left and right leg columns 4a and 4a forming the first leg 4 of the front leg 2 are pivotable in the front-rear direction. The upper ends of 4a and 4a are connected to each other by a connecting rod 4b (see FIG. 3), and the lower ends of both leg columns 4a and 4a are connected to each other by a connecting rod 4c. The first leg portion 4 of the front leg 2 is configured by the side connecting rod 4b and the lower side connecting rod 4c. In both leg pillars 4a, 4a of the first leg 4, telescopic rods 5a, 5a are fitted in such a manner that they can expand and contract, and the lower ends of both telescopic rods 5a, 5a are connected to each other by a connecting rod 5b. The second leg portion 5 of the front leg 2 is constituted by both the telescopic rods 5a, 5a and the connecting rod 5b. A caster K is attached to the lower end of each telescopic rod 5a.

  The first leg 4 and the second leg 5 of the rear leg 3 have the same structure as that of the front leg 2, and the first leg 4 includes left and right leg posts 4a, 4a and an upper side connecting rod 4b. The second leg portion 5 is composed of both telescopic rods 5a and 5a and a connecting rod 5b. In addition, both expansion / contraction rods 5a and 5a of the second leg 5 are adjusted to expand and contract with respect to the leg columns 4a and 4a of the first leg 4 by the expansion / contraction adjusting means 16, respectively. The expansion / contraction adjustment means 16 will be described later with reference to FIGS.

  The brace 6 is composed of a pair of brace members 6a and 6b that can be fitted to each other so as to be stretchable and fixed at a desired stretched position, and the detailed structure is shown in FIGS. 4 (a) to 4 (d). One brace member 6a is made of a metal pipe having a required length, as shown in (a) to (c). One end of the brace member 6a is crushed into a flat shape by pressing, and the attachment end 6ao is formed. The pin insertion hole 17 is formed in the attachment end 6ao, and a number of fixing bolt insertion holes 18 are provided at a constant pitch over almost the entire area of the breath member 6a.

  As can be seen from FIGS. 4B and 4C, the other brace member 6b is slightly larger in diameter than the one brace member 6a, and is required to be slidably fitted to the one brace member 6a. One end of the pipe is crushed into a flat shape by pressing to form a mounting end 6bo, and a pin insertion hole 19 is provided in the mounting end 6bo. On the other end side, as shown in (d), a nut bolt for screwing a fixing bolt 20 for fixing the brace members 6a and 6b fitted to each other at a required expansion / contraction position and inserting the bolt into the pipe is provided. 21 is attached. The fixing bolt 20 is composed of a butterfly bolt, and as shown in (d), the brace member 6b passes through the brace member 6b from the nut member 21 with both the brace members 6a and 6b fitted to each other. By inserting the pin through the pin insertion hole 18, both the brace members 6a and 6b can be fixed at a required expansion / contraction position.

  The brace 6 is disposed between the upper end of the first leg 4 of the front leg 2 and the lower end of the second leg 5 of the rear leg 3 on the left and right sides of the front and rear legs 2 and 3. Between the lower end portion of the second leg portion 5 of the front leg body 2 and the upper end portion of the first leg portion 4 of the rear leg body 3, the front leg body 2 is fitted so as to be extendable and connectable at a required extension / contraction position. A brace 6 comprising a pair of brace members 6a and 6b is hung in a hook shape (in an X shape). A specific method for attaching the brace 6 will be described below.

  FIG. 1 shows a state in which two braces 6 and 6 are hooked on the right side surfaces of the front and rear legs 2 and 3, and FIG. 5 (a) shows the front and rear legs 2 shown in FIG. , 3 shows a state in which the two braces 6, 6 on the right side surface side are folded. One brace 6 of the two braces 6, 6 spanned in a hooked manner is one of the brace members 6 a of the pair of brace members 6 a, 6 b, as shown in FIG. 1 and FIG. The mounting end portion 6ao is pivotally fixed to the upper end portion of the front side mounting bracket 13 by a bolt 22 (normally in a state where it cannot be removed) using the pin insertion hole 17 (see FIG. 4), and the other brace The attachment end portion 6bo of the member 6b has a pin insertion hole 19 and a fastening pin 23 with a lock claw 23a attached to the lower end portion of the second leg portion 5 of the rear leg 3 (see FIG. 4C). It can be removably pivoted by inserting it into the.

  As shown in FIG. 1 and FIG. 5B, the other brace 6 of the two braces 6 and 6 to be hooked is an attachment end portion of one brace member 6a of the pair of brace members 6a and 6b. 6ao is fixedly pivoted to the upper end of the rear side mounting bracket 14 by means of bolts 22 (see FIG. 4 (c)) using the pin insertion hole 17, and the mounting end 6bo of the other brace member 6b is The pin insertion hole 19 can be removed by inserting it into a fastening pin 23 with a lock claw 23a (see FIG. 4C) attached to the lower end of the second leg 5 of the front leg 2. Pivot to.

  As shown in FIG. 5 (b), the front side mounting bracket 13 and the rear side mounting bracket 14 are each provided with a fastening pin 23 with a lock claw 23a at the lower end portion. When the legs 2, 3 (the first leg 4 and the second leg 5) are folded and stored on the lower surface side of the stage 1, the mounting end 6bo of the brace member 6b of each brace 6 is moved forward and backward. This is for removing from the fastening pin 23 at the lower end of the second leg 5 of the legs 2 and 3 and replacing it with the fastening pin 23 with the lock claw 23a of the front and rear mounting brackets 13 and 14. The state is shown in FIGS. 5 (a) and 5 (b).

  As described above, the work table is provided between the first leg 4 side of the front leg 2 and the second leg 5 of the rear leg 3 and the first leg 4 side of the rear leg 3. Between the second leg portion 5 of the front leg 2, a brace 6 comprising a pair of brace members 6 a and 6 b that are fitted so as to be extensible and can be fixed at a desired extensible position is bridged in a hook shape. Since the mounting end portions 6ao and 6bo of the respective brace members 6a and 6b are pivotally attached to the respective required mounting portions, the front and rear legs are supported by the braces 6 and 6 spanned in a bowl shape when the work table is used. 2 and 3 are sufficiently reinforced and work can be performed in a stable state. In this embodiment, the mounting end 6ao of the brace member 6a of one brace 6 is pivotally attached to the front mounting bracket 13, and the mounting end 6ao of the brace member 6a of the other brace 6 is connected to the rear mounting bracket. 14, the attachment end 6ao of the brace member 6a of one brace 6 is pivotally attached to the upper end of the first leg 4 of the front leg 2, and the brace member 6a of the other brace 6 is engaged. The attachment end 6ao may be pivotally attached to the upper end of the first leg 4 of the rear leg 3.

  Therefore, when adjusting the height of each leg 2, 3 by extending or contracting the second leg 5 of each of the front and rear legs 2, 3 with respect to the first leg 4, the fixing bolt 20 of each brace 6 is attached. If the brace members 6a and 6b are loosened and can be expanded and contracted, the brace members 6a and 6b of the brace 6 expand and contract in conjunction with the expansion and contraction of the second leg 5 with respect to the first leg 4. The height adjustment work of the legs 2 and 3 can be easily performed.

  Further, in this work table, the attachment end 6ao of one of the pair of breath members 6a, 6b of each brace 6 is fixedly pivoted to the required part of attachment, and the attachment end of the other breath member 6b is fixed. Since the portion 6bo is pivotally attached to the required mounting portion, when the entire front and rear legs 2, 3 are folded to the lower surface side of the stage portion 1 as shown in FIGS. 5 (a) and 5 (b), By removing the attachment end portion 6bo of the other brace member 6b from the leg portions 4 and 5 of the legs 2 and 3, the braces 6 and 6 can be folded and stored together with the legs 2 and 3 on the lower surface side of the stage portion 1. it can.

  The handrails 10 installed on the stage unit 1 are arranged on left and right side edges of the stage unit 1, that is, rectangular frame-shaped side handrail units 10 a and 10 a arranged on both sides, and both front and rear side edges of the stage unit 1. It is composed of a rectangular frame-shaped front and rear wife side handrail portion 10b, 10c arranged, and each wife side handrail portion 10b is rotatable about a pivot portion P at one end thereof, and has an opening and closing door. I also use it. In addition, each side handrail portion 10a and the front and rear end face side handrail portions 10b and 10c are provided with skirting boards 24, respectively.

  As shown schematically in FIGS. 2 and 3, the outriggers 12 provided on the left and right sides of the front and rear legs 2 and 3 are each fixed to a support column 25 and an upper end portion and a lower portion of the support column 25. The horizontal support rods 26 and 26, the connecting rod 27 connecting the upper and lower horizontal support rods 26 and 26 to the other end side, and the expansion and contraction rods 28 fitted to the respective columns 25 so as to be extendable and contractible. A screw-type base jack 29 with a base plate 29 a is attached to the lower end portion of the flange 28, and the other ends of the upper and lower horizontal support rods 26, 26 form the first leg 4 of the front and rear legs 2, 3. It is attached and fixed to the pillar 4a. Each expansion / contraction rod 28 is adjusted for expansion / contraction with respect to the column 25 by the expansion / contraction adjustment means 30 having the same structure as the expansion / contraction adjustment means 16 for the front and rear legs 2 and 3, and finely adjusted by the screw-type base jack 29.

  Next, an example of the expansion / contraction adjusting means 16 for the front and rear legs 2 and 3 will be described with reference to FIGS. 6 and 7. A leg column 4 a that forms the first leg 4 of each of the front and rear legs 2 and 3 is as follows. The engaging protrusion 56 is provided on both sides of the outer surface of one of the side walls a among the side walls facing in the front-rear direction, and the outer side of the inner surface of the other side wall b is inclined outwardly. A mating surface 55 is formed. The telescopic rod 5a of the second leg 5 fitted to the pedestal 4a of the first leg 4 has a substantially rectangular cross-sectional shape, and a cross-sectional shape is formed at the center of the side wall facing in the front-rear direction. A hollow portion 5o that is recessed in a letter shape is formed along the longitudinal direction, and a pin receiving step portion 33 and a bottom surface of one hollow portion 5o that faces one side wall a of the leg 4a of the first leg portion 4 Members 35 alternately having flat portions 34 are integrally provided by screws 36 or the like at appropriate intervals. The pin receiving step portion 33 is formed with a stepped surface 33a whose upper surface side is horizontal, whereas the lower surface side thereof is formed with an inclined surface 33b. The uppermost member 35a is formed with a downward step surface 33c facing the upward step surface 33a with an interval where the adjustment pin 38 can be inserted, and if the adjustment pin 38 is not operated, the second leg portion is formed. 5 is configured not to extend and move further downward.

  A mounting bracket 37 is attached to one side wall a of the leg 4a of the first leg 4 so as to engage with the engaging protrusions 56 on both sides, and is fixed to a position near the lower end of the leg 4a. The mounting bracket 37 is provided with a lower adjustment pin 38 and an upper rattling prevention pin 39 therethrough. These adjustment pins 38 and rattling prevention pins 39 pass through the ceiling wall 37a and bottom wall 37b of the mounting bracket 37 and the side wall a of the leg column 4a of the first leg member 4, and the pin receiving step portion 33 and the flat portion 34. It is configured to be able to protrude toward the. The adjustment pin 38 is urged toward the pin receiving step 33 as indicated by an arrow x by a compression spring 41 interposed between the ceiling wall 37 a of the mounting bracket 37 and the spring receiver 40, and the adjustment pin 38. An open position maintaining small piece 42 is projected perpendicularly to this, and the adjustment pin 38 is held back by the holding of the knob 43 against the urging force of the compression spring 41 as indicated by the arrow y and indicated by the arrow z. As shown, by rotating 90 °, the small piece 42 is engaged with the small piece engaging portion 44 projecting from the ceiling wall 37a of the mounting bracket 37, and the adjustment pin 38 can be maintained in the open position. .

  Further, the rattling prevention pin 39 has a middle portion of the screw shaft cut to a small diameter, and is provided with screw portions 45 and 46 on the proximal end side and the distal end side, and the proximal end side screw portion 45 is attached to the mounting bracket. 37, the front end portion of the rattling prevention pin 39 is brought into pressure contact with the flat portion 34 between the pin receiving stepped portions 33 and 33, and the base end portion side is conversely engaged. By removing the threaded portion 45 from the female threaded portion 47, it is biased by a compression spring 49 provided between the outer surface of the mounting bracket 37 and the knob 48 of the anti-rattle pin 39, thereby opening the anti-rattle pin 39. It is configured so that it can be maintained in a state.

  Therefore, when operating the expansion / contraction adjusting means 16, the open position maintaining small piece 42 is engaged with the small piece engaging portion 44 as described above to maintain the adjustment pin 38 in the open state from the pin receiving step portion 33, and The rattling prevention pin 39 is also maintained in an open state, and by this operation, the telescopic rod 5a of the second leg portion 5 can freely expand and contract with respect to the leg column 4a of the first leg portion 4. The telescopic rod 5a of the leg 5 is moved to the required telescopic position with respect to the leg 4a of the first leg 4, and the adjustment pin 38 is rotated by 90 ° as indicated by the arrow z at the required position. The projecting open position maintaining small piece 42 is detached from the small piece engaging portion 44. As a result, the adjustment pin 38 is urged by the compression spring 41 and engages with the pin receiving step portion 33, and the load received by the leg 4 a of the first leg portion 4 receives the adjustment pin 38 and the pin receiving step portion 33 with which the adjustment pin 38 engages. And the contraction operation of the telescopic rod 5a of the second leg 5 can be prevented.

  In this case, when the telescopic rod 5a of the second leg 5 is extended and moved downward relative to the leg 4a of the first leg 4, it is not necessary to keep the adjustment pin 38 in the open position. The adjustment pin 38 comes into contact with the inclined surface 33b of the pin receiving step portion 33 by extending and moving the telescopic rod 5a of the second leg portion 5 downward, and the adjustment pin 38 is attached to the compression spring 41 along the inclined surface 33b. The adjustment pin 38 is automatically urged by the compression spring 41 by retreating against the force and overcoming the inclined surface 33 b, and can be engaged with the step surface 33 a of the pin receiving step portion 33.

  In order to prevent rattling between the column 4a of the first leg 4 and the telescopic rod 5a of the second leg 5, as shown in FIG. 6 from the state of FIG. The base end side bolt portion 45 of the rattling prevention pin 39 is screwed into the female screw portion 47 against the urging force, and the tip end portion is strongly pressed against the flat portion 34. Then, the telescopic rod 5a of the second leg portion 5 is pressed toward the other side wall b of the leg column 4a of the first leg portion 4 by the pressing force, and the outwardly spread inclination mechanism formed on both sides of the side wall b. By engaging both side edges of the telescopic hook 5a of the second leg 5 with the mating surface 55, not only the pressing direction but also the pressing reaction force in the direction perpendicular thereto acts on the telescopic hook 5a of the second leg 5. Thus, rattling in both directions is reliably prevented, and rattling in all directions between the leg 4a of the first leg 4 and the telescopic rod 5a of the second leg 5 is completely prevented. With the above operation, the leg length of each leg 2 can be adjusted to be extendable.

  The expansion / contraction adjustment means 30 for adjusting the expansion / contraction rod 28 of the outrigger 12 with respect to the support column 25 has the same configuration as the expansion / contraction adjustment means 16 for the front and rear legs 2 and 3 described above. Description of the operation and the operation is omitted.

  As shown by broken lines in FIG. 2, one end portions of the reinforcing rods 7 and 8 are pivotally attached to attachment shafts 57 and 58 arranged side by side on the back side of the central portion of the top plate 1 a forming the stage portion 1. As shown schematically in FIGS. 2 and 3, one end of each of the reinforcing rods 7 and 8 is connected to a connecting rod 4c that connects the left and right leg pillars 4a and 4a of the first leg 4 in the front and rear legs 2 and 3, respectively. It is pivotally attached.

  As shown in FIGS. 8A and 8B, the joint device 9 for folding the reinforcing rods 7 and 8 in two has a cylindrical upper lock body 61 and a lower lock body 62. The upper and lower beam members 59 and 60 of the reinforcing rods 7 and 8 are fixed to the upper beam member 60 and the lower beam member 60 by welding or the like. At the center, the lower beam member 60 of the reinforcing rods 7 and 8 can be folded in two in the direction of arrow A in the figure with respect to the upper beam member 59. A lock block 67 pivotally supported on the lower lock body 62 by a lock shaft 66 is provided across the upper and lower lock bodies 61 and 62.

  A lock piece 68 projects from the tip of the lock block 67, and the lock piece 68 engages with an engagement protrusion 69 provided on the upper lock body 61. Further, the lock block 67 is provided with a hollow portion 70, in which a lock spring 71 made of a compression spring is accommodated, one end of which is received by the joint shaft 65, and the other end is received by the inner wall of the hollow portion 70, The lock surface 68 a of the lock piece 68 is urged by the lock spring 71 to be strongly pressed and engaged with the engagement surface 69 a of the engagement protrusion 69 of the upper lock body 61.

  An opening lever 72 for releasing the lock state of the lock block 67 is projected at the rear end portion of the lock block 67, and an upper side rail member is disposed on the outer peripheral surface of the front end portion of the lock block 67 as described later. A guide surface 67a for sliding the lock block 67 along the corner portion 69b (see FIG. 8B) of the engaging projection 69 when the lower side crosspiece member 60 extends from the half-folded state with respect to 57. Is formed.

  8A, the lock piece 68 of the lock block 67 pivotally attached to the lock shaft 66 of the lower lock body 62 is strongly applied to the engagement protrusion 69 of the upper lock body 61 by the urging force of the lock spring 71. FIG. A state in which the upper-side beam member 59 and the lower-side beam member 60 are linearly locked by pressing engagement is shown. In order to open the lower side beam member 60 in a folded state with respect to the upper side beam member 59 as shown in FIG. 8B from this locked state, the release lever 32 is locked as shown by an arrow B. What is necessary is just to rotate downward against the urging force of the spring 71. By this operation, the lock piece 68 is separated from the engagement protrusion 69 and the engagement state between both is released. In this state, the lower crosspiece member 64 is rotated upward about the joint shaft 65 as indicated by an arrow A. By doing so, the lower beam member 60 can be folded in two so as to overlap the upper beam member 59 as shown in FIG.

  In order to extend the lower-side beam member 60 again from this half-folded state into a linear state, the lower-side beam member 60 is rotated downward about the joint shaft 65 to thereby guide the guide surface 67a of the lock block 67. Comes into contact with the corner portion 69b of the engaging projection 69 of the upper crosspiece member 59 and is pushed by the engaging projection 69 so that the lock block 67 is slightly immersed in the joint shaft 65 against the urging force of the lock spring 71. . Then, the guide surface 67a slides on the corner portion 69b of the engaging projection 69 by further pivoting the lower crosspiece member 60, and the lock block 67 is engaged with the engaging projection 69 by passing through the corner portion 69b. Since it is released from the pressing force, the lock spring 71 is urged and protrudes from the retracted state, and the lock piece 68 of the lock block 67 is engaged with the engagement protrusion 69, so that the crosspiece members 69 and 70 are in a straight line state. Will be kept strong.

  As described above, the joint device 9 locks both the reinforcing rods 7 and 8 in a straight state and maintains the state, and maintains the upright state of the front and rear legs 2 and 3 reinforced by the both reinforcing rods 7 and 8. The reinforcement rods 7 and 8 can secure the rigidity of the front and rear legs 2 and 3 at the use position together with the braces 6 and 6 hooked between the front and rear legs 2 and 3.

  In the above embodiment, an example of a work table that can fold the front and rear legs 2 and 3 to the back side of the stage unit 1 has been shown, but the present invention fixes the front and rear legs 2 and 3 to the stage unit 1. It can be applied to a work table that is connected to each other and only adjusts the expansion and contraction of the legs 2 and 3.

  Further, the telescopic ladder 11 shown in FIGS. 1 and 2 has a well-known structure, and thus the description thereof is omitted. In addition, handrails 73 are attached to the telescopic ladder 11 on both sides of the upper half portion, and hand rods 74 and 74 are attached to the upper end side, respectively. The telescopic ladder 11 is installed at the front end portion of the stage portion 1 at a predetermined inclination angle as shown in FIG. 1 by hooking a hook hook 75 attached to the upper end portion to the front end portion of the stage portion 1. Is done.

It is a side view of the work table concerning the present invention. It is a top view of the work bench. It is a rear view of the work bench. (a) is a front view showing one of the brace members of the brace, (b) is a front view of the two brace members fitted together, and (c) is a plan view of the brace members fitted together. Figure (d) is an enlarged view of the part surrounded by arrow (a) in (c). (a) is a side view of a state in which the two braces of the front and rear legs are folded, and (b) is an enlarged view of (a). It is sectional drawing which shows the detailed structure of the expansion-contraction adjustment means of a leg. FIG. 7 is a cross-sectional view taken along the line of FIG. 6. (a) is a longitudinal sectional view of the joint device in a state where the reinforcing rod is extended, and (b) is a longitudinal sectional view in a state where the reinforcing rod is folded in two.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stage part 2 Front leg 3 Rear leg 4 1st leg 5 of each front and rear leg 5 Second leg 6 of each front and rear leg 6 Breath 6a Breath member 6b Breath member 6ao Breath member attachment end 6bo Breath member Mounting end of

Claims (3)

A workbench comprising a stage portion for performing work and a pair of front and rear legs provided to be foldable at the front and rear end portions of the stage portion, wherein each leg is pivotally attached to the stage portion. And a workbench configured to be extendable and adjustable by a second leg portion that is connected to the first leg portion so as to be extendable and fixable at a required extension / contraction position,
Expansion and contraction between the first leg side of the front leg and the second leg part of the rear leg and between the first leg side of the rear leg and the second leg part of the front leg. A brace consisting of a pair of breath members that can be fitted and fixed at a required expansion / contraction position is spanned, and the mounting end of each brace member is pivotally attached to the required mounting portion, Joints for pivotally connecting a reinforcing rod between the first leg of the front leg and the first leg of the rear leg, and folding the reinforcing rod in half along the longitudinal direction of each reinforcing rod A workbench characterized by comprising an apparatus .   The mounting end of one of the pair of breath members that make up each brace is fixedly pivoted to the required mounting part, and the mounting end of the other breathing member can be removed from the required mounting part. The work table according to claim 1, wherein the work table is pivotally attached.   The work table according to claim 1 or 2, wherein an outrigger whose height can be adjusted is detachably attached to both left and right sides of each of the front and rear legs.

Images