JP4050685B2 - Scaffolding stairs - Google Patents

Description

  The present invention relates to a staircase for scaffold used for an assembly scaffold at a construction work site.

  As a conventional scaffolding staircase, a publicly known document cannot be specifically mentioned, but a conventionally used staircase is a metal footboard body between a pair of left and right metal side frames arranged in an inclined manner. The treads, which are formed by fitting and fixing metal end caps with a U-shaped cross section to the left and right ends, are horizontally mounted at regular intervals, and each tread is inserted from the side frame. The fixing bolts are fixed to the both side frames by screwing and tightening the female bolts provided on the end caps.

  The conventional scaffold staircase having the above-described structure has a problem in that when the bolts fixing the respective treads to the side frames are loosened, the treads are dropped from the side frames, causing a serious accident.

  In view of the above problems, the present invention can prevent an accident by holding the tread on the side frame without dropping off even if the bolt fixing the tread on the side frame is loosened. The purpose is to provide a staircase for scaffolding.

Means for solving the above-described problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is configured such that the pair of left and right side frames 1 and 1 arranged in an inclined manner are as follows. A step K is formed by horizontally laying a tread 2 having horizontal U-shaped end caps 4 and 4 fitted and fixed to left and right ends of the tread main body 3 at regular intervals. In the stairs K for scaffolding which is fixed to the both side frames 1 and 1 by screwing the bolts 5 inserted from the side frames 1 into the female screw portions 6 provided in the end caps 4 and tightening them. Each tread plate 2 is provided with an engaging protrusion 10 at a required portion on the outer surface of each end cap 4, and each side frame 1 is provided with an engaging hole 20 or an engaging recess at a tread plate horizontal position, and characterized in that the engagement projections 10 of the end cap 4 in the hole 20 or the engaging recess so as to engage and hold That.

  According to a second aspect of the present invention, in the staircase for scaffolding according to the first aspect, the engagement protrusion 10 of each end cap 4 is formed integrally with the end cap 4.

  According to a third aspect of the present invention, in the staircase for scaffolding according to the first aspect, the engagement protrusion 10 of each end cap 4 is formed separately from the end cap 4 and attached to the end cap 4. It is characterized by comprising.

In the invention according to claim 4, end caps 4, 4 having a U-shaped cross-section are fitted and fixed to the left and right end portions of the tread body 3 between the pair of left and right side frames 1, 1 arranged in an inclined manner. Each of the treads 2 is screwed into a female screw portion 6 provided on each end cap 4 with a bolt 5 inserted from each side frame 1. In the scaffolding stairs K that are fixed to the side frames 1, 1 by tightening together, each tread 2 has an engagement hole 20 or an engagement with a required portion on the outer surface of each end cap 4. A recess is provided, and each side frame 1 is provided with an engagement protrusion 10 at the lateral position of the tread board on the inner surface, and this engagement protrusion 10 is engaged and held in the engagement hole 20 or the engagement recess of each end cap 4. It was made to let it be made to do.

  According to a fifth aspect of the present invention, in the staircase for scaffolding according to the fourth aspect, the engagement protrusion 10 of each side frame 1 is formed integrally with the side frame 1.

  Claim 6 is the staircase for scaffolding according to claim 4, wherein the engagement protrusion 10 of each side frame 1 is formed separately from the side frame 1 and attached to the side frame 1. It is characterized by.

  The effect of the invention by the above solution will be described with reference numerals in the embodiments described later. According to the staircase K for scaffolding of the invention according to claim 1, each footplate 2 is provided with an outer portion of each end cap 4. Engagement protrusions 10 are provided on the side required portions, and each side frame 1 is provided with an engagement hole 20 or an engagement recess at the lateral position of the tread plate, and each end cap 4 is engaged with the engagement hole 20 or the engagement recess. Since the joint protrusion 10 is engaged, even if the bolt 5 that fixes a certain footboard 2 to the side frame 1 is loosened and removed during use of the scaffolding stairs K, the footboard 2 is held in a state in which the engagement protrusions 10 and 10 of both end caps 4 and 4 are engaged with the engagement holes 20 and 20 of the side frames 1 and 1, and is prevented from falling off.

  The engagement protrusion 10 of each end cap 4 may be formed integrally with the end cap 4 as described in claim 2, and the end cap 4 is defined as described in claim 3. It may be formed separately and attached to the end cap 4.

  According to the scaffolding stairs K of the invention according to claim 4, each tread plate 2 is provided with an engagement hole 20 or an engagement recess in an outer surface required portion of each end cap 4, and each side frame 1 has an inner surface. Since the engagement protrusion 10 is provided at the horizontal position of the tread plate and the engagement protrusion 10 is engaged with the engagement hole 20 or the engagement recess of the end cap 4, during the use of the staircase K for scaffolding, Even if the bolt 5 that fixes a certain tread 2 to the side frame 1 may loosen and come off, the tread 2 may be engaged with the engaging projections 10 projecting from the inner side surfaces of the side frames 1, 1. , 10 are held in a state of being engaged with the engagement holes 20 and 20 or the engagement recesses of the end caps 4 and 4, so that the drop-off is prevented.

  The engagement protrusion 10 of each side frame 1 may be formed integrally with the side frame 1 as described in claim 5, or separately from the side frame 1 as described in claim 6. It may be formed and attached to the side frame 1.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a usage state of a staircase K for scaffolding according to the present invention, FIG. 2 is a side view of the staircase K for scaffolding, FIG. (A) of FIG. 2 is an enlarged view of a portion surrounded by an arrow A in FIG. 2, (b) is an enlarged view of a portion surrounded by an arrow B in FIG. 2, and FIG. 4 is an enlarged sectional view taken along line XX in FIG. . 5A is a perspective view showing an end portion side of the tread board 2, and FIG. 5B is a cross-sectional perspective view of a main part of the staircase K for scaffolding.

  The staircase K for scaffolding is formed by horizontally placing a footboard 2 horizontally on a pair of left and right side frames 1 and 1 arranged in an inclined manner along the longitudinal direction of the side frame 1 at regular intervals. Hanging hooks 7a and 7b are attached to the upper and lower ends of the frames 1 and 1, respectively. The hooks 7a and 7b are attached to the cross member 9 of the building frame 8 of the frame scaffold W as shown in FIG. The hook 7b on the lower end side can be stably grounded on the floor surface F as shown in FIG. 3 (b).

  Each tread 2 is composed of a tread main body 3 and end caps 4, 4 having a U-shaped cross section that are fitted and fixed to both left and right ends of the tread main body 3, and bolts 5 inserted from the side frames 1. Are fixed by being screwed into nuts 6 (female screw portions) attached to the end caps 4 and being clamped between the side frames 1 and 1. Each tread plate 2 is provided with an engaging projection 10 at the center of the outer surface of each end cap 4, and each side frame 1 is provided with an engaging hole 20 in each tread plate 2 at a tread plate horizontal position, The engagement protrusion 10 of the end cap 4 is engaged with the engagement hole 20 of the side frame 1.

  The structure of the scaffold staircase K will be described in more detail. Each side frame 1 is formed of an aluminum alloy extruded die having a substantially U-shaped cross section as shown in FIGS. 4 and 5, and the U-shaped groove portion 1c. Is placed facing outward. Although not shown in the drawings, each side frame 1 is provided with a pair of left and right bolt insertion holes at positions where the respective treads 2 are horizontally mounted in a posture inclined at a constant angle, and end portions from the bolt insertion holes. The bolt 5 is screwed into the nut 6 of the cap 4.

  The tread body 3 of each tread 2 is made of an extruded aluminum alloy material having a cross-sectional shape as shown in FIG. 6 (b). Forming the portions 11, 11, 12 and, as shown in (a) of the same figure, on the surface side, the front and rear side end portions and intermediate portions thereof are provided with anti-slip uneven strip portions 13, 13, 14; An anti-slip hole 15 is formed between the uneven strip 13 and the uneven strip 14 by burring.

  As can be seen from FIGS. 7A to 7D, the end cap 4 is made of an aluminum alloy extruded mold formed of an outer wall portion 4a and upper and lower wall portions 4b, 4b having a substantially U-shaped cross section. Thus, the central region of the outer wall 4a is raised, and bolt insertion holes 17 and 17 are provided at both right and left ends of the raised portion 16, and a nut 6 (female screw portion) is provided on the back side of each bolt insertion hole 17. The engagement protrusion 10 is integrally formed by press work in the center part of the outer surface of the protruding part 16. Rivet holes 18 are provided at both end portions of the upper and lower wall portions 4b.

  When the engaging projection 10 is horizontally mounted on the tread plate 2 between the side frames 1 and 1, it is engaged with the engaging hole 20 at the tread plate horizontal position of the side frame 1 as shown in FIG. It has become so. 9 (a) and 9 (b), the end cap 4 is fitted to both the left and right ends of the tread body 3, and the end cap 4 is coupled to the tread body 3 using the rivet holes 18. By doing so, the tread board 2 is shown assembled.

  The treads 2 thus assembled are interposed between a pair of left and right side frames 1, 1 arranged in an inclined manner, and engaging projections 10, 10 provided on both end caps 4, 4 of each tread 2 are provided. The bolts 5 are inserted into the end caps 4 and 4 side from the bolt insertion holes of the side frames 1 and 1 in the state where the side frames 1 and 1 are engaged with the engagement holes 20 and 20 provided at the horizontal position of the tread board. Each tread board 2 is fixed in a state of being sandwiched between the side frames 1 and 1 by being screwed into the nut 6 and tightened. This state is shown in FIGS. 3, 4 and 5B.

  As described above, in the staircase K for scaffolding, the engagement protrusions 10 are provided on the outer surface required portions of the end caps 4 of the respective treads 2, and the side frames 1 are placed at the horizontal positions of the treads 2. Since the engagement hole 20 is provided, and the engagement protrusion 10 of each end cap 4 is engaged with the engagement hole 20, a certain footboard 2 is attached to the side frame 1 during use of the staircase K for scaffolding. Even if the bolt 5 fixed to the base plate may come loose and come off, the tread plate 2 has the engaging projections 10, 10 of the end caps 4, 4 with the engaging holes 20, 20 of the side frames 1, 1. It is held in a state of being engaged with each other, so that dropping is prevented.

  The engaging protrusion 10 of the end cap 4 described above is formed integrally with the end cap 4 as shown in FIG. 8A, but the engaging protrusion 10 shown in FIG. As described above, it may be formed separately from the end cap 4 and attached to the end cap 4. In order to attach the engaging protrusion 10 formed separately to the end cap 4, for example, a screw shaft portion 21 is integrally connected to the back side of the engaging protrusion 10, and the engaging protrusion 10 is connected to the end cap 4. A hole 22 may be provided at the attachment location, and the screw shaft portion 21 of the engagement protrusion 10 may be passed through the hole 22 of the end cap 4 and tightened and fixed with the nut 23.

  The engagement hole 20 of the side frame 1 with which the engagement protrusion 10 of the end cap 4 engages is formed so as to penetrate the side frame 1. An engagement recess into which the mating protrusion 10 can be engaged may be formed on the inner surface of the side frame 1 (not shown).

  Further, in the scaffold stairs K of the embodiment described above, the engagement protrusions 10 are provided on the end caps 4, and the engagement holes 20 or the engagement recesses are provided at the lateral positions of the treads of the side frames 1. As shown in the staircase for scaffolding shown in the embodiment of FIG. 10, the engagement protrusion 10 is provided at the treadboard horizontal position of each side frame 1, and the engagement hole 20 or the engagement recess for engaging with the engagement protrusion 10 is formed. The end cap 4 may be provided.

  That is, in the embodiment shown in FIG. 10 (a), the engagement protrusion 10 is integrally formed by pressing in the lateral position of the side frame 1 and the engagement hole 20 is formed in the raised portion 16 of the end cap 4. The engagement protrusion 10 of the side frame 1 is opened and engaged with the engagement hole 20 of the end cap 4. Instead of the engagement hole 20, an engagement recess into which the engagement protrusion 10 can be engaged may be formed on the end cap 4 side.

  In the embodiment shown in FIG. 10 (b), the engagement protrusion 10 is formed separately from the side frame 1 and attached to the side frame 1. In this case, for example, the side frame 1 and A screw shaft portion 21 is integrally provided on the back side of the separate engagement protrusion 10, and a hole 22 is provided in the engagement protrusion mounting portion on the side frame 1, so that the screw shaft portion 21 of the engagement protrusion 10 is located on the side. What is necessary is just to clamp | tighten and fix with the nut 23 through the hole 22 of the frame 1. FIG. Thus, the engagement protrusion 10 is engaged with the engagement hole 20 or the engagement recess of the end cap 4.

  In the case of the staircase for scaffolding as shown in FIGS. 10 (a) and 10 (b), the bolt 5 that fixes a certain tread plate 2 to the side frame 1 is loosened during the use of the staircase K for scaffolding. Even when the tread plate 2 may come off, the engaging projections 10, 10 projecting from the inner side surfaces of the side frames 1, 1 may be engaged with the engaging holes 20, 20 of the end caps 4, 4 or the engaging plate 20. Since it is held in a state of being engaged with the joint recess, it is prevented from falling off, and an accident can be prevented beforehand.

  In the embodiment of the present invention described above, the nut 6 is fixed to the back side of the bolt insertion hole 17 provided in the end cap 4 as a female screw for screwing the bolt 5 inserted from the side frame 1. Instead of using the bolt, the bolt insertion hole of the end cap 4 may be a screw hole. In that case, it is preferable that the screw hole is cut into a hole formed by burring. Further, in this embodiment, one engagement projection 10 is provided on each end cap 4 of the tread plate 2, and one engagement hole 20 or engagement recess is provided at the tread plate horizontal position of the side frame 1. Two or more engagement protrusions 10 and engagement holes 20 or engagement recesses with which the engagement protrusions 10 are engaged may be provided. The same applies to the case where the engagement protrusion 10 is provided at the lateral position of the tread board of each side frame 1.

It is a perspective view which shows the use condition of the staircase for scaffolds concerning this invention. It is a side view of the staircase for scaffolding. (a) is an enlarged view of a portion surrounded by an arrow A in FIG. 2, and (b) is an enlarged view of a portion surrounded by an arrow B in FIG. FIG. 3 is an enlarged sectional view taken along line XX in FIG. 2. (a) is a perspective view which shows the edge part side of a tread, (b) is a principal part cross-sectional perspective view of the staircase for scaffolding. (a) is a top view which shows a tread body, (b) is a side view. (a) is a front view of an end cap, (b) is a plan view, (c) is an end view, and (d) is an enlarged cross-sectional view along line YY of (a). (a) is an enlarged sectional view taken along the line ZZ of (a) of FIG. 7, and (b) is a sectional view similar to (a) showing an end cap according to another embodiment. (a) is a plan view of the tread board, and (b) is a side view. (a), (b) is principal part sectional drawing of the staircase for scaffolding by further another embodiment.

Explanation of symbols

K stairs for scaffolding 1 side frame 2 tread board 3 tread body 4 end cap 5 bolt 6 nut (female thread part)
10 engaging protrusion 20 engaging hole

Claims (6)

Between the pair of left and right side frames that are arranged in an inclined manner, a tread that is formed by fitting and fixing an end cap with a U-shaped cross section to the left and right ends of the tread body is horizontally placed at regular intervals. A staircase for a scaffold, wherein each step board is fixed to the side frame by being inserted from each side frame and screwed into a female screw portion provided on the end cap and tightened. In
Each tread is provided with an engagement protrusion on a required portion on the outer surface of each end cap, and each side frame is provided with an engagement hole or an engagement recess at the tread plate horizontal position. A staircase for scaffolding, wherein the engagement protrusions of the end caps are engaged and held .   The staircase for scaffolding according to claim 1, wherein the engagement protrusion of each end cap is formed integrally with the end cap.   The staircase for scaffolding according to claim 1, wherein the engagement protrusion of each end cap is formed separately from the end cap and is attached to the end cap. Between the pair of left and right side frames that are arranged in an inclined manner, a tread that is formed by fitting and fixing an end cap with a U-shaped cross section to the left and right ends of the tread body is horizontally placed at regular intervals. In the staircase for scaffolding, each step board is fixed to the side frame by being inserted from each side frame and screwed into a female screw portion provided on the end cap and tightened.
Each tread is provided with an engagement hole or a recess in the required part on the outer surface of each end cap, and each side frame is provided with an engagement protrusion at the tread plate horizontal position on the inner surface. A staircase for scaffolding characterized by being engaged and held in an engagement hole or an engagement recess of a part cap.   The staircase for scaffolding according to claim 4, wherein the engaging projection of each side frame is formed integrally with the side frame.   The staircase for scaffolding according to claim 4, wherein the engagement protrusion of each side frame is formed separately from the side frame and is attached to the side frame.

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