JP4037403B2 - Joining structure of strut and pedestal in stepladder etc. - Google Patents

Description

  The present invention relates to a joining structure between a support column and a step bar in a stepladder, a step platform, a ladder, a work table, and the like.

  For example, as shown in FIG. 1, the ladder at both ends of the work table is composed of a pair of support columns 1, 1 and a plurality of traverses 2 laid across the support columns 1, 1. Is made of a substantially U-shaped section material, and the end of a crosspiece 2 made of a rectangular tube-shaped material or a substantially U-shaped section material is inserted between the left and right side walls 1a, 1b of the support column 1 by being inserted. The end of the crosspiece 2 is joined by rivets or bolts.

  Thus, publicly known documents such as patent gazettes and the like cannot be specifically mentioned as the conventional joining structure between the support post and the crosspiece. However, in the joining structure conventionally employed, (a) to (a) in FIG. There is something as shown in (d). FIG. 5 (a) shows a joining structure in which the step rail 2 is joined to the support column 1 by the rivet 20, and FIGS. 5 (b) and (c) are auxiliary members 21 and 22 at the joint portion of the support column 1 and the step guide 2, respectively. Is added and reinforced, and shows a joining structure that joins with the rivet 20, and (d) shows a joining structure that joins with the rivet 20 by enlarging the joint surface with the column by increasing the size of the entire step rail 2. ing.

  In the above-described conventional joining structure, in the structure in which the step rail 2 is joined to the support column 1 alone, since the joint surface with the support column 1 is small, sufficient rigidity cannot be secured. In this case, if the welded structure is used, sufficient rigidity can be obtained, but the welded structure is a structure that should be avoided as much as possible if desorption / replacement at the time of breakage is necessary. Further, according to the structure in which the auxiliary members 21 and 22 are added and reinforced at the joint portion between the support column 1 and the tram 2, it is relatively easy to ensure the rigidity, but additional processing of the auxiliary members 21 and 22 occurs. In products that require detachment and replacement, the degree of skill of the processor and the degree of completion after replacement of the equipment become unstable, and sufficient rigidity cannot be secured in many cases. This is inappropriate when repair is required. . In addition, the method of enlarging the entire length of the traverse 2 and enlarging the joint surface with the support column is accompanied by unnecessary enlargement of the traverse 2 and causes problems of cost increase and weight increase. .

  In view of the above-described problems, an object of the present invention is to provide a joining structure between a support column and a step rail in a stepladder or the like that can secure sufficient rigidity and can suppress an increase in cost and weight.

Means for solving the above-described problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 relates to the left and right side walls 1a of the column 1 made of a substantially U-shaped section material in a stepladder or the like. A strut 1 and a step 2 in a stepladder, etc., in which an end portion of a stepped bar 2 made of a rectangular tube-shaped mold or a substantially U-shaped section is inserted between 1b and joined with a rivet or a bolt. In the joining structure, the end enlarged reinforcing side walls 3a and 3b extending on the same side as the side walls 2a and 2b of the step 2 adjacent to the side walls 1a and 1b of the support column 1, respectively, By attaching an auxiliary member 3 having a substantially U-shaped cross section consisting of a bottom wall portion 3c connecting the enlarged side wall portions 3a and 3b at both ends, the bottom wall portion 3c of the auxiliary member 3 is attached to the lower wall 2d of the footrail 2 Pre-installed integrally, so that the end of the cross 2 is the end of the auxiliary member 3 Wherein the left and right side walls 1a of the post 1, by fitting inserted between 1b that the manner so as to joined by rivets or bolts with. In addition, the substantially U-shaped section material forming the support column 1 is assumed to be formed in a substantially U shape by the left and right side walls 1a and 1b and the back wall 1c formed of a single wall or an inner and outer double wall.

According to the second aspect of the present invention, the end portion of the crosspiece 2 made of a rectangular tube-shaped mold or a substantially U-shaped cross section is provided between the left and right side walls 1a, 1b of the support column 1 made of a substantially U-shaped section material such as a stepladder. In the joining structure of the column 1 and the step rail 2 in a stepladder, etc., which are fitted and inserted by rivets or bolts, the end portion of the step rail 2 is adjacent to the side walls 1a and 1b of the column 1 End expansion reinforcing side walls 3a and 3b extending in a plane with the side walls 2a and 2b of the step rail 2 are formed integrally, and the end portion of the step rail 2 is placed between the left and right side walls 1a and 1b of the column 1. It is characterized by being fitted and inserted and joined by rivets or bolts .

  According to a third aspect of the present invention, in the joining structure between the support column and the step rail in the stepladder or the like according to the second aspect, the end portion enlarged reinforcing side wall portions 3a, 3b are extended reinforcing side wall portions 3A, 3B over the entire length of the step rail 2. It is characterized in that it is formed by cutting away the intermediate portions Ma and Mb while leaving the side wall portions at both ends of the step-bar shape material having a substantially U-shaped cross section.

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, the side walls 2a of the traverse 2 adjacent to the side walls 1a, 1b of the column 1 are described. Since the auxiliary member 3 having the end enlarged reinforcing side wall portions 3a and 3b that extend in the same plane as 2b is integrally attached to the end portion of the step rail 2 in advance, The joining structure with the step rail 2 can ensure sufficient rigidity because the end portion of the step rail 2 is enlarged by the end portion enlarged reinforcing side walls 3a and 3b. Also, the end expansion reinforcing side walls 3a and 3b are attached to the end of the step rail 2 in advance and integrated with the step rail 2, thereby simplifying the joining operation and reducing the cost. In addition to being able to plan, the repair member can be rationalized and the repair work can be facilitated. Further, since the end-enlarged reinforcing side walls 3a and 3b are attached only to the end portion of the tram 2, as shown in FIG. 5 (d), the entire tram is enlarged so that the joint surface with the support column is provided. Compared with the conventional method which expands, a cost and a weight can be restrained low.

Further, according to the joining structure of the present invention, the end enlarged reinforcing side walls 3a and 3b do not need to be attached to and detached from the step rail 2, so that the end enlarged reinforcing side walls 3a and 3b are used as the step rail 2. On the other hand, it can be attached by means of complete fixing such as welding, rivet, adhesion, etc., and (b) and (c) in FIG.
As shown in FIG. 4, it is possible to easily obtain a rigidity higher than that of a conventional joining structure in which auxiliary members 21 and 22 are added and reinforced.

  As in the invention according to claim 2, at the end portion of the tram 2, the end-enlarged reinforcing side wall 3a that extends flush with the side walls 2a, 2b of the tram 2 adjacent to the side walls 1a, 1b of the column 1 respectively. , 3b are integrally formed, it is not necessary to attach a member having the end enlarged reinforcing side wall portions 3a, 3b to the end portion of the tram 2 when joining the support column 1 and the tram 2 to each other. The joining work is simplified, the cost can be reduced and the weight can be reduced, and the end-enlarged reinforcing side walls 3a and 3b are formed integrally with the side walls 2a and 2b of the step rail 2. Therefore, greater rigidity can be obtained.

  According to the third aspect of the invention, the end portion of the step rail 2 is cut by cutting the intermediate portions Ma and Mb of the step rail mold material in which the enlarged reinforcing side walls 3A and 3B are formed over the entire length of the step rail 2. The enlarged reinforcing side wall portions 3a and 3b can be formed easily and easily.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a workbench, and shows ladder-like legs H at both ends of the workbench. The support columns 1 and 1 and the crosspiece 2 that is horizontally mounted between the support columns 1 and 1 in a plurality of stages. FIG. 2 (a) is an enlarged view of the part indicated by the arrow A in FIG. 1, and shows an embodiment of the joining structure of the support column 1 and the tread bar 2 according to the present invention, and (b) is a state before joining. The state which has joined the edge part side of the crosspiece 2 to the support | pillar 1 is shown. In addition, (c) in the figure is a cross-sectional view of the column 1, (d) is a front view showing the end side of the step 2 in more detail, and (e) is the right side of the step 2 shown in (d). FIG.

  As shown in FIG. 2 (c), the support column 1 is made of an aluminum extruded mold formed in a substantially U-shaped cross section by left and right side walls 1a, 1b and a back wall 1c. As shown in FIG. 2 (e), each step rail 2 includes left and right side walls 2a and 2b adjacent to the left and right side walls 1a and 1b of the column 1, and an inclined upper wall 2c and a lower wall 2d that serve as treads. As shown in FIGS. 2 (b), 2 (c) and 2 (e), the left and right side walls 1a of the support column 1 are formed at the end of each crosspiece 2 as shown in FIG. , 1b are attached to auxiliary members 3 having end-side expanded reinforcing side wall portions 3a, 3b that extend flush with the side walls 2a, 2b of the sidewalk 2 adjacent to each other. In this embodiment, as shown in FIG. 2 (c), the back wall 1c is only a single wall as the back wall 1c. Includes a mold made of a double wall of an inner wall and an outer wall.

As shown in FIG. 2 (e), the auxiliary member 3 includes left and right end enlarged reinforcing side wall portions 3a and 3b that extend flush with the side walls 2a and 2b of the crosswalk 2, and both end enlarged reinforcing side wall portions. It consists of an aluminum extrusion mold material having a substantially U-shaped cross section formed by a bottom wall portion 3c connecting 3a and 3b, and by connecting the bottom wall portion 3c to the lower wall 2d of the step rail 2 with a rivet 4, It is attached to the crosspiece 2 integrally.

  Since the support column 1, the tram 2, and the auxiliary member 3 are rivet-joined, rivet holes 4 and 5 are provided at the joint part. That is, the rivet holes 5 are formed in the side walls 2a and 2b of the column 1, and the rivet holes are respectively formed in the front end portions of the side walls 2a and 2b of the step rail 2 and the front end portions of the respective end enlarged reinforcing side wall portions 3a and 3b of the auxiliary member 3. 6 is provided. FIG. 3A is a front view showing the entirety of the traverse 2 with the auxiliary members 3 attached to both ends.

  Thus, in order to join the column 1 and the foot 2, as shown in FIG. 2B, the end of the foot 2 with the auxiliary member 3 attached between the left and right side walls 1 a, 1 b of the column 1. The parts are fitted and inserted, and a rivet 7 is inserted between the rivet holes 5 and 6 to be rivet-joined, and a joining structure as shown in FIGS. 2 (a) and 2 (e) is obtained.

  As described above, when joining the support column 1 and the step rail 2, the end-enlarged reinforcement side wall portions 3 a extending in the same plane as the side walls 2 a and 2 b of the step frame 2 adjacent to the side walls 1 a and 1 b of the support column 1, respectively. Since the auxiliary member 3 having 3b is integrally attached to the end portion of the traverse 2 in advance, the joining structure of the strut 1 and the traverse 2 to be joined in this way is the end enlarged reinforcing side wall portions 3a and 3b. As a result, the end portion of the traverse 2 is enlarged and sufficient rigidity can be secured. Also, the end expansion reinforcing side walls 3a and 3b are attached to the end of the step rail 2 in advance and integrated with the step rail 2, thereby simplifying the joining operation and reducing the cost. In addition to being able to plan, the repair member can be rationalized and the repair work becomes easy. Further, since the end-enlarged reinforcing side walls 3a and 3b are attached only to the end portion of the tram 2, as shown in FIG. 5 (d), the entire tram is enlarged so that the joint surface with the support column is provided. Compared with the conventional method which expands, a cost and a weight can be restrained low.

  The enlargement of the end of the crosspiece 2 not only obtains a large joint surface, but also increases the inclination of the virtual intersection line 8 connecting both the columns 1 and 1 as shown in FIG. The most effective oblique reinforcement effect on the ladder surface rigidity can be obtained.

  Further, according to this joining structure, the end enlarged reinforcing side walls 3a and 3b do not need to be attached to and detached from the step rail 2, so the end enlarged reinforcing side walls 3a and 3b are It can be attached by complete fixing means such as welding, rivet, adhesion, etc., and has a higher rigidity than the conventional joining structure in which auxiliary members 21 and 22 are additionally reinforced as shown in FIGS. 5 (b) and 5 (c). Can be easily obtained.

  FIG. 4 shows a joining structure between the support post and the step cross when the step stand 2 integrally formed with the end enlarged reinforcing side wall portions 3a and 3b at both ends is joined to the support post 1. FIG. The joint structure which joined the edge part of the foot rail 2 which formed the edge expansion reinforcement side wall part 3a, 3b integrally to the support | pillar 1 similarly to a) is shown, (b) is the state before joining, and the end of the foot rail 2 (C) is a front view showing the end portion side of the trawl 2 in more detail, and (d) is a right side view of the traverse 2 shown in (c). FIG.

  As shown in FIG. 4 (c), the end reinforcing reinforcing side walls 3a and 3b of the step rail 2 shown in FIG. 4 form enlarged reinforcing side walls 3A and 3B (imaginary lines) over the entire length of the step rail 2. It is formed by cutting away the intermediate portions Ma and Mb by press working while leaving both side wall portions (portions corresponding to the end enlarged reinforcing side wall portions 3a and 3b) of the extruded aluminum material for the crosspiece. At this time, the intermediate portions Ma and Mb of the cut-out aluminum extruding material for the step rail are melted and reused.

  By cutting out the intermediate portions Ma, Mb of the step rail mold material that forms the expanded reinforcing side wall portions 3A, 3B over the entire length of the step rail 2 as described above, the end portion enlarged reinforcing side wall portions 3a, 3b can be formed easily and easily.

  In order to join the crosspiece 2 and the column 1 as in the case of FIG. 4, as shown in FIG. 4B, between the left and right side walls 1a and 1b of the column 1, the end enlarged reinforcing side wall 3a. , 3b are integrally inserted, and the end of the crosspiece 2 is fitted and inserted, and the rivet 7 is inserted between the rivet holes 5 and 6, and the rivets are joined together, as shown in FIGS. 4 (a) and 4 (d). Structure.

  In the joining structure described with reference to FIGS. 2 and 4, the strut 1 and the traverse 2 are rivet joined, but bolt joining may be used instead of this rivet joining. Further, in the case of bolt joining, a female screw member such as a nut may be integrally attached to the side walls 2a and 2b of the foot cross 2 and the bolt joint portions of the end enlarged reinforcing side walls 3a and 3b in advance.

FIG. 2 is a side view of a workbench showing ladder-like legs at both ends of the workbench. (a) is an enlarged view of a portion indicated by an arrow (a) in FIG. 1 and shows an embodiment of a joining structure of a support post and a foot cross according to the present invention, and (b) an end of the foot cross in a state before joining. (C) is a cross-sectional view of the column, (d) is a front view showing the end side of the trawl in more detail, and (e) is shown in (d). It is a right view of a foot cross. (a) is a front view showing the whole of the tram with auxiliary members attached to both ends, and (b) is an explanatory view for explaining a virtual crossing line connecting both the columns. The joining structure when joining the pedestal that has the end expansion reinforcing side wall integrally formed at both ends to the column is shown. (A) shows the end of the step pedestal integrally formed with the end expanding reinforcement side wall to the column. (B) shows the state where the end side of the step rail is joined to the column in the state before joining, and (c) shows the end side of the step rail in more detail. Front view, (d) is a right side view of the pedestal shown in (c). (a)-(d) is explanatory drawing which shows the conventional various joining structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side wall 1a, 1b Side wall 2 of a support 2 Side rail 2a, 2b Side wall of a side rail 3 Auxiliary member 3a, 3b End expansion reinforcement side wall

Claims (3)

Insert the end of a square tube-shaped mold or a crosspiece made of a substantially U-shaped cross-section material into the left and right side walls of a column made of a substantially U-shaped cross-section material such as a stepladder, and join them with rivets or bolts. In the joined structure of the column and the step rail in the stepladder or the like, the end portion of the step rail includes an end-enlarged reinforcing side wall portion that extends flush with the side wall of the step rail adjacent to the side wall of the column, and both ends. An auxiliary member having a substantially U-shaped cross section consisting of a bottom wall portion connecting the side wall portions of the enlarged reinforcing portion is integrally attached in advance by attaching the bottom wall portion of the auxiliary member to the lower wall of the step rail. A structure for joining a support post and a crosspiece in a stepladder or the like, wherein the end portion of the support member is fitted and inserted between the left and right side walls of the support post together with the end portion of the auxiliary member, and joined by rivets or bolts . Insert the end of a square tube-shaped mold or a crosspiece made of a substantially U-shaped cross-section material into the left and right side walls of a column made of a substantially U-shaped cross-section material such as a stepladder, and join them with rivets or bolts. In the joint structure between the support post and the step pedestal in the stepladder, etc., the end enlarged reinforcement side wall portion that extends flush with the side wall of the step pedestal adjacent to the side wall of the support post is integrally formed at the end of the step pedestal. A structure for joining a support post to a step stand in a stepladder or the like, wherein the end portion of the step stand is fitted and inserted between the left and right side walls of the support and is joined by rivets or bolts .   The end-enlarged reinforcing side wall is formed by cutting out the middle portion of the step rail mold material, which has a substantially U-shaped cross section that forms an enlarged reinforcing side wall over the entire length of the step rail. The joining structure of the support column and the step rail in the stepladder or the like according to claim 2.

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