JP2008266978A - Portable workbench - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable workbench having supporting legs and rungs connected firmly to each other, reduced in the number of components, manufacturable at low cost, and improved in aesthetic appearance. <P>SOLUTION: This portable workbench includes a ladder frame having the plurality of rungs 20 installed between the pair of supporting legs 10 at proper intervals through connecting metal fittings 30. Each rung is formed of a hollow member having an upper surface tread piece 21, side surface pieces 22 formed on the front and rear sides of the tread piece, and a bottom surface piece 23. Each connecting metal fitting is formed of a plate member having an external fixing piece 31 fixed to the front and rear outer surfaces of the supporting leg with rivets 80 and an internal fixing piece 32 extending from one side of the external fixing piece, brought into contact with the inner surface of the side surface piece of the rung and the inner surfaces of the tread piece and the bottom surface piece adjacent to the side surface pieces, respectively, and fixed to the side surface pieces with the rivets 80. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable worktable, for example, a portable worktable used for construction work sites, interior / exterior work such as ceilings and wall surfaces of buildings, and high-place work such as electrical wiring work.

  Conventionally, as this type of portable worktable, a foldable portable worktable having a ladder frame in which a plurality of steps are attached at appropriate intervals between a pair of support legs is widely used. In this portable work table, a step bar is formed into a substantially trapezoidal cross section having a tread on the top surface, side surfaces formed before and after the tread surface, and a bottom surface. The side of the rail is mechanically coupled with a fastener such as a rivet via a plate-shaped metal fitting, and the tread is provided with a flange that protrudes forward and backward from the front and rear ends of the tread surface. There is known a structure in which the lower surface of the collar portion is supported at the upper end (see, for example, Patent Document 1).

Further, in the connection hardware in Patent Document 1, in addition to the support portion of the collar portion, a support step portion that supports the bottom surface of the step bar is formed by drawing.
Japanese Patent Laying-Open No. 2005-113387 (Claims, FIG. 1)

  However, in the portable workbench described in Japanese Patent Application Laid-Open No. 2005-113387, the upper end of the plate-shaped connecting hardware supports the flanges protruding from the front and rear ends of the tread of the tread bar, so the connecting hardware There is a concern that a gap may easily be formed between the treadle and the treadle, and rattling may occur due to repeated use or excessive load. Further, since the connecting metal fitting is formed by drawing, it is difficult to increase the dimensional accuracy of the engaging portion between the support leg and the step bar, and there is a concern that the connecting part between the support leg and the step bar may be rattled. Moreover, since the crosspiece is formed in a substantially trapezoidal cross section and the dimensions of the front and rear side surfaces are different, it is necessary to prepare two types of connecting brackets, and there are problems that the number of components increases and the cost increases. Furthermore, since the connecting bracket is fixed to the outside of the step bar in a state where the whole is exposed, there is also a problem that the aesthetic appearance is deteriorated.

  The present invention has been made in view of the above circumstances, and it is possible to strengthen the connection between the support leg and the step bar, and to reduce the number of components, to reduce the cost, and to improve the aesthetics. The purpose is to provide a portable worktable.

  In order to solve the above-mentioned problems, the portable worktable of the present invention is premised on a portable worktable provided with a ladder frame in which a plurality of step bars are attached at appropriate intervals via a connecting bracket between a pair of support legs. The tread is formed by a hollow member having a tread piece on the upper surface, side pieces formed on the front and rear sides of the tread piece, and a bottom piece, and the connecting bracket is arranged on the front and rear of the support leg. An outer fixing piece fixed to the outer side surface of each side by a fixing member such as a rivet, and an inner surface of the side piece of the step bar extending from one side of the outer fixing piece and a step adjacent to the side piece. It is formed of a plate-like member having an inner fixing piece that is in contact with the inner surfaces of the face piece and the bottom piece and is fixed to the side piece with a fixing member such as a rivet. In this case, it is preferable that the tread bar has a tread surface that is in a horizontal state when used. For example, the tread bar is formed so that a cross section having a tread surface and a bottom surface is formed in a substantially parallelogram (claim 5), Or the cross section which has a tread surface which becomes a horizontal state at the time of use can be formed in a substantially trapezoid (Claim 6).

  By comprising in this way, the internal fixing piece of a connection metal fitting can be fixed in the state which contact | abutted to the inner surface of the side piece of a tread bar, and the inner surface of the tread piece and bottom piece adjacent to this side piece, respectively. .

  In the present invention, it is preferable to provide a concave / convex step along the longitudinal direction of the outer side surface of the support leg, and to provide a concave / convex stepped portion that engages with the concave / convex step on the external fixing piece of the connecting bracket ( Claim 2).

  By comprising in this way, the latching uneven | corrugated strip provided in the outer surface of a support leg and the uneven | corrugated step provided in the external fixing piece of a connection metal fitting can be fixed in the engaged state.

  Further, it is preferable to form protrusions having mutually parallel surfaces on the inner surfaces of the tread piece and the bottom piece adjacent to the side piece of the step bar.

  By comprising in this way, the internal fixing piece of a connection metal fitting and the inner surface of the tread piece and bottom piece of a tread can be reliably contact | abutted.

  Further, the front and rear dimensions of the support leg and the step rail are formed to be the same, and a notch is formed at an end of the step surface piece and the bottom piece of the step bar that contacts the support leg. It is preferable to have a stepped connecting piece between the outer fixed piece and the inner fixed piece, and to insert the stepped connected piece into the notch of the step bar.

  With this configuration, the connecting bracket can be formed in a substantially crank shape in cross section, and the stepped connecting piece is inserted into the notch of the step bar to reduce the exposure of the connecting bracket to the outside. And can be fixed in a state in which the support leg and the treadle are in contact with each other.

  In addition, the support legs and the step bars are formed from an aluminum extruded shape, and the connecting fitting is formed from an aluminum extruded shape, and then cut out from the aluminum extruded shape, such as punching by pressing. (Claim 7). Here, “made of aluminum” means that an aluminum alloy is included.

  By comprising in this way, since almost the whole structural member of a worktable can be formed with an aluminum member, weight reduction can be achieved.

  According to this invention, since it is configured as described above, the following effects can be obtained.

  (1) According to the first, fifth, and sixth aspects of the present invention, the inner fixing piece of the coupling metal is applied to the inner surface of the side piece of the tread bar and the inner surfaces of the tread piece and the bottom piece adjacent to the side piece. Since it can be fixed in contact, it can be rigid against the load in the longitudinal direction (left-right direction) and width direction (front-rear direction) of the treadle, and the support leg and the treadle are firmly connected. can do. In addition, since the internal fixing piece of the connecting bracket can be disposed in the step bar, the external exposure of the connecting bracket can be reduced, and the appearance can be improved.

  (2) According to the invention described in claim 2, fixing is performed in a state in which the engaging projections and depressions provided on the outer surface of the support leg and the projections and depressions provided on the external fixing piece of the coupling metal are engaged. Therefore, in addition to the above (1), the supporting leg and the step bar can be firmly connected.

  (3) According to the invention described in claim 3, the internal fixing piece of the connecting bracket and the inner surface of the tread piece and the bottom piece of the step bar can be reliably brought into contact with each other. In addition to this, it is possible to further increase the strength of the step bar and to firmly connect the support leg and the step bar.

  (4) According to the invention described in claim 4, the stepped connecting piece can be inserted into the notch of the step bar to reduce the exposure of the connecting bracket to the outside. In addition to the above (1) to (3), it is possible to firmly connect the support leg and the step bar and to improve the aesthetic appearance. .

  (5) According to the invention as set forth in claim 7, since substantially the entire components of the workbench can be formed of aluminum members, the weight can be further reduced in addition to the above (1) to (4). Can be achieved.

  Hereinafter, the best embodiment of a portable worktable according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing an example of the usage state of the portable worktable according to the present invention, and FIG. 2 is a schematic front view of the portable worktable.

  The portable work table according to the present invention includes a ladder frame 40 in which a plurality of step bars 20 are mounted at appropriate intervals between a pair of support legs 10 via connecting fittings 30, and a support leg 10 between the pair of ladder frames 40. The top plate 50 is pivotably attached to the top plate 50 via a hinge 51, and the foldable stay 52 is interposed between the top plate 50 and the uppermost tread bar 20. An extension leg 60 is attached to the lower end of the support leg 10 by a lock mechanism 70 so that the height can be adjusted.

  As shown in FIG. 3, the support leg 10 is formed of a substantially channel-shaped aluminum alloy extruded shape. In this case, the pair of support legs 10 constituting the ladder frame 40 are arranged so that the opening side faces each other, and the upper portions of the both support legs 10 have parallel straight parts 11. The lower end has an inclined portion 12 extending in a direction gradually separating from each other. In addition, on the outer side surfaces of the front and rear pieces 13 and 14 of the support leg 10, locking irregularities 15 are provided along the longitudinal direction.

  In terms of safety measures, the angle formed between the line connecting the lower ends of the inclined portions 12 of the support legs 10 and the inclined portions 12 is generally regulated to 85 degrees or less, and the support in the use state, that is, in the open leg state. The angle formed between the ladder frame 40 composed of the legs 10 and the step bars 20 and the horizontal plane is defined as 75 degrees or less.

  As shown in FIGS. 3 and 7, the tread bar 20 includes a tread piece 21 on the top surface that is in a horizontal state when used, a side piece 22 formed before and after the tread piece 21, a bottom piece 23, It is formed by a hollow member having a substantially parallelogram cross section. The tread bar 20 is formed of an extruded shape made of an aluminum alloy having a width dimension equal to or larger than the dimension of the support leg 10 in the front-rear direction, and the upper surface of the tread piece 21 and the lower surface of the bottom piece 23 are parallel to each other. A plurality of irregular strips 24 are provided. In addition, both end surfaces 25 in the longitudinal direction of the tread bar 20 are cut obliquely so as to be parallel to the inclined portion 12 of the support leg 10, and ends of the tread piece 21 and the bottom piece 23 that are in contact with the support leg 10. A substantially U-shaped notch 26 is formed in the portion.

  Further, protrusions 27 having parallel surfaces to the inner surfaces of the tread piece 21 and the bottom piece 23 adjacent to the side piece 22 in the tread bar 20 so that the upper and lower end faces of the coupling metal 30 abut as will be described later. (See FIGS. 5 and 7). Thus, by providing the protrusions 27 having surfaces parallel to each other on the inner surfaces of the tread piece 21 and the bottom piece 23 adjacent to the side piece 22, the corners of the hollow tread 20 are thickened. And the rigidity of the tread bar 20 itself can be increased.

  The connection fitting 30 extends to the outer front and rear surfaces of the support leg 10 by a fixing member, for example, a rivet 80, and extends to one side of the external fixing piece 31 via a stepped connection piece 33. Existing on the inner surface of the side piece 22 of the tread bar 20 and the protrusions 27 on the inner surfaces of the tread piece 21 and the bottom piece 23 adjacent to the side piece 22, respectively. It is formed of a substantially crank-shaped plate member having an internal fixing piece 32 to be fixed.

  In this case, as shown in FIG. 6 (b), an uneven step 34 that can be slidably engaged with a locking uneven 15 provided on the support leg 10 is provided on the back surface side of the external fixing piece 31. Is formed. Further, as shown in FIG. 6, the external fixing piece 31 is formed in a vertically long substantially parallelogram shape having a high dimension with respect to the internal fixing piece 32 having the same dimension as the height of the side piece 22 of the step bar 20. The upper and lower ends of the step-like connecting piece 33 between the outer fixing piece 31 and the inner fixing piece 32 are formed with concave arcuate surfaces 35 respectively connected to the upper and lower end surfaces of the outer fixing piece 31 and the upper and lower end surfaces of the inner fixing piece 32. Has been.

  The connection fitting 30 formed as described above is formed by cutting out from an extruded shape made of aluminum alloy. In this embodiment, it is formed by stamping by press working. Note that through holes 81 for the rivets 80 are formed in two places on the upper and lower sides of the external fixing piece 31 and two places on the left and right of the center portion of the inner fixing piece 32, respectively. As this rivet, a blind rivet is used.

  As shown in FIGS. 3 and 10, the extension leg 60 is formed of a hollow extruded shape member made of aluminum alloy that can be inserted inward of the support leg 10. In this case, the pair of side pieces 61 constituting the extension leg 60 has a hollow portion 62 in order to avoid interference with the inward projecting portion of the rivet 80 that fixes the external fixing piece 31 of the coupling metal 30 and the support leg 10. A concave portion 63 that is bent inward is formed. The front leg 64 of the extension leg 60 positioned on the opening side of the support leg 10 is provided with a locking hole 65 that can be engaged with a stopper 71 of the lock mechanism 70 attached to the lower part of the support leg 10 with an appropriate interval. And is drilled.

  As shown in FIGS. 3 and 10, the lock mechanism 70 has a concavo-convex portion 72 that engages with a locking concavo-convex portion 15 provided on the support leg 10, and is fixed to the support leg 10 by a fixing member such as a rivet 80. A case 75 formed of an extruded material made of an aluminum alloy having a pair of side wall pieces 73 and a case main body 74 having a substantially hat-shaped cross section connected to the base end side of both side wall pieces 73, A pin 76 penetrating the case main body 74 is rotatably disposed in the case main body 74, and a stopper 71 that is constantly pressed inside the support leg 10 by the biasing force of the spring 77, and the biasing force of the spring 77. And a lock lever 78 that reverses the stopper 71 from the support leg 10 side.

  By configuring the extension leg 60 and the lock mechanism 70 as described above, the extension leg 60 can be expanded and contracted relative to the support leg 10 and adjusted to a predetermined height.

  Next, a method of connecting the support leg 10 and the step bar 20 using the connection fitting 30 will be described. First, the inner fixing piece 32 and the step-like connecting piece 33 of the coupling fitting 30 are inserted inward of the stepping bar 20 through the notch 26 of the stepping bar 20, and the upper and lower end surfaces of the inner fixing piece 32 are placed on the stepping bar 20. The inner surface of the side piece 22 and the protrusions 27 on the inner surfaces of the tread piece 21 and the bottom piece 23 adjacent to the side piece 22 are brought into contact with the through holes 81 and the internal fixing pieces 32 provided in the side piece 22. It is fixed by a rivet 80 that penetrates the provided through hole 81. In this manner, as shown in FIG. 3, the internal fixing pieces 32 of the connection fitting 30 are similarly fixed to the front and rear side pieces 22 at the left and right ends of the step bar 20. Next, the step bar 20 to which the coupling fitting 30 is fixed is inserted between the pair of support legs 10, and the uneven step 34 provided on the external fixing piece 31 is attached to the engagement uneven stripe 15 provided on the support leg 10. Engage with each other to bring the tread bar 20 into contact with a predetermined position of the support leg 10. And it fixes by the rivet 80 which penetrates the penetration hole 81 provided in the external fixing piece 31, and the penetration hole 81 provided in the support leg 10. FIG.

  As described above, the support leg 10 and the step bar 20 are connected to each other by using the connection bracket 30, whereby the inner fixing piece 32 of the connection bracket 30 is connected to the inner surface of the side piece 22 of the step bar 20 and the side piece 22. Can be fixed by rivets 80 in contact with the protrusions 27 on the inner surfaces of the tread piece 21 and the bottom piece 23 adjacent to each other. In addition, since the stepped connecting piece 33 of the connecting metal fitting 30 is inserted into the notch 26 of the step bar 20, the support leg 10 and the step bar 20 can be brought into contact with each other. Furthermore, the engaging projections and recesses 15 provided on the support leg 10 and the projections and recesses 34 provided on the external fixing piece 31 of the coupling metal 30 can be engaged in close contact. Therefore, it is possible to give rigidity to the rotation moment applied to the connecting bracket portion caused by the load applied to the step bar 20 in the vertical direction and the load applied to the longitudinal direction (left and right direction) of the step bar 20. The tread bar 20 can be firmly connected. Further, since the internal fixing piece 32 and the step-like connecting piece 33 of the connection fitting 30 are inserted inward of the tread bar 20, the exposed area of the connection fitting 30 to the outside can be reduced, and the appearance is refreshed. The aesthetics can be improved.

  In addition, when the tread bar 20 is damaged during use, the damaged tread bar 20 can be replaced.

  In this case, as shown in FIG. 11, all the rivets 80 in the lowermost step bar 201 (fixing the support leg 10 and the connecting bracket 30 and fixing the connecting bracket 30 and the step bar 201) It can be removed by removing the connecting bracket 30 from the stepping bar 201 while sliding the stepping bar 201 downward, and a new stepping bar 201 can be attached by the opposite operation.

  For the step bars 202 other than the lowest step, all the rivets 80 (the one that fixes the support leg 10 and the connecting bracket 30 and the one that fixes the connecting bracket 30 and the step bracket 202) are scraped off and the step bar 202 is moved downward. The slide bar 202 can be removed by moving it to either the left or right side (left side in the figure) while sliding, removing one of the connecting brackets 30 and then removing the connecting bracket 30 on the opposite side (right side in the figure). Further, the new step bar 202 is attached by the opposite operation.

  When fixing the stepping bar 20, the stepped bar 20 is fixed to the support leg 10 by engaging the concave / convex stepped portion 34 provided on the external fixing piece 31 with the locking concave / convex line 15 provided on the supporting leg 10. In the state of being in contact with the position, it is fixed by the rivet 80.

  In the above-described embodiment, the case where the tread bar 20 is formed of a hollow member having a substantially parallelogram in cross section has been described. However, any other hollow member having a tread piece on the upper surface that is in a horizontal state when used can be used. As shown in FIG. 8, for example, as shown in FIG. 8, the cross section is substantially composed of a tread piece 21A on the top surface that is in a horizontal state during use, side pieces 22A and 22B formed before and after the tread piece 21A, and a bottom piece 23A. The hollow member formed in a trapezoid may be sufficient. In this case, as shown in FIG. 8 (a) and FIG. 9 (a), the high side piece 22B protrudes on the inner surface of the tread piece 21A and the bottom piece 23A adjacent to the side pieces 22A and 22B. The portion 27A may be formed, or as shown in FIGS. 8B and 9B, a part of the inner surface of the high side piece 22B may be raised to form the protrusion 27B.

  The step bar 20A having a substantially trapezoidal cross section is also formed in an extruded shape made of an aluminum alloy in the same manner as the step bar 20 having a substantially parallelogram cross section. In addition, since other parts are formed in the same manner as in the first embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted.

  In addition, although the said embodiment demonstrated the case where the support leg 10 was formed in channel shape, you may form the support leg 10 with the extruded profile made from aluminum alloy of a cross-sectional hollow rectangular shape.

It is a schematic perspective view which shows an example of the use condition of the portable worktable which concerns on this invention. It is a schematic front view of the said portable worktable. It is a perspective view which shows the connection part of the support leg in this invention, and a step crosspiece. It is sectional drawing which shows the connection part of the said support leg and stepping bar. It is sectional drawing (a) in alignment with the II line | wire of FIG. 4, II section enlarged sectional view (b) of (a), and III section enlarged sectional view (c) of (a). It is sectional drawing (b) which follows the IV-IV line of the front view (a) and (a) which shows the coupling metal fitting in this invention. It is a perspective view which shows 1st Embodiment of the treadle in this invention. It is a perspective view which shows another embodiment of the step crosspiece in this invention. It is sectional drawing which shows a connection part with the treadle and connection metal fitting of another embodiment shown in FIG. It is sectional drawing (b) which follows the VV line | wire of (a) and (a) which shows the extension leg and locking mechanism in this invention. It is a schematic front view which shows the procedure of replacement | exchange of the treadle in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support leg 15 Locking uneven | corrugated strip 20,20A, 201,202 Tread 21,21A Tread piece 22,22A, 22B Side piece 23,23A Bottom piece 26 Notch 30 Connecting bracket 31 External fixing piece 32 Internal fixing piece 33 Stepped connecting piece 34 Uneven portion 40 Ladder frame 80 Rivet (fixing member)

Claims (7)

In a portable worktable having a ladder frame in which a plurality of step bars are attached at appropriate intervals via a connecting bracket between a pair of support legs,
The treadle is formed of a hollow member having a tread piece on the upper surface, side pieces formed before and after the tread piece, and a bottom piece,
The connecting bracket includes an external fixing piece that is fixed to a front and rear outer surfaces of the support leg by fixing members such as rivets, and an inner surface of the side piece of the step rail extending from one side of the external fixing piece. And a plate-like member having an inner fixing piece that is in contact with the inner surfaces of the tread piece and the bottom piece adjacent to the side piece and is fixed to the side piece with a fixing member such as a rivet,
A portable workbench characterized by that. In the portable worktable of Claim 1,
The support leg has a locking unevenness along the longitudinal direction of the outer surface,
The connection fitting has an uneven step portion that engages with the engaging uneven protrusion on the external fixing piece,
A portable workbench characterized by that. In the portable worktable of Claim 1 or 2,
A portable work table, wherein protrusions having surfaces parallel to each other are formed on the inner surfaces of the tread piece and the bottom piece adjacent to the side piece of the step bar. In the portable worktable in any one of Claims 1 thru | or 3,
Forming the same length in the front-rear direction of the support leg and the stepping bar, and forming a notch at the end of the stepping piece and the bottom piece of the stepping piece that contacts the support leg;
The connecting bracket has a step-like connecting piece between the outer fixing piece and the inner fixing piece, and the step-like connecting piece is inserted into the notch of the step bar. Stand. In the portable worktable in any one of Claims 1 thru | or 4,
A portable workbench characterized in that the step bar has a substantially parallelogram-shaped cross section having a step surface and a bottom surface that become horizontal when in use. In the portable worktable in any one of Claims 1 thru | or 4,
A portable workbench characterized in that the step bar has a substantially trapezoidal cross section having a step surface that is horizontal when in use. In the portable worktable in any one of Claim 1 thru | or 6,
The support legs and the step bars are formed of an aluminum extruded profile,
A transportable workbench characterized in that the connection fitting is formed by cutting out from an aluminum extruded profile.

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