JPH0538299U - Side plate fitting device for step rail in stepladder - Google Patents

Abstract

(57) [Abstract] [Purpose] In a stepladder in which the crossing is projected widely behind the prop, the side plate fitted to the entrance of the crossing is pulled out at the rear end protruding portion, resulting in an unsightly gap in the entrance of the crossing. To prevent inconvenience. A screw pocket-shaped shaft pocket 31 opening forward is formed on the inner surface of the protruding rear end of the step rail 3, and an insertion shaft 37 tightly fitted to the shaft pocket 31 is formed on the side plate 5, and a supporting piece 3 thereof.
9 and the support piece 39 and the opening 34 of the shaft pocket 31.
It is formed integrally with the insertion shaft 37 so as to project more. In order for the side plate 5 to open at the projecting portion 8, it is necessary to bend inward in relation to the step rail 3 as a prerequisite, but since it is held by the shaft pocket 31 and is reinforced by the support piece 39, it is never necessary. Since it does not bend and does not come off from the shaft pocket 31, no gap is formed in the wood entrance 4 of the step rail 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for fitting a side plate to a wood mouth of a step rail in a stepladder having an extruded shape member such as aluminum as an assembly member.

[0002]

[Prior Art]

 In the past, in this type of stepladder, the pedestal may be screwed directly to the stanchion, but as is often the case with foldable low stepladders that have a tread at the upper end, the foot can be stabilized on the pedestal. When it is necessary to hang it, the step rail is made wider than the strut, and the widened part is projected rearward.Therefore, the side plate made of plastic that covers the wood mouth is fitted to the end of the step rail. It is worn, and the step rail is screwed to the column via the side plate.

A fitting piece to the inner circumference of the step bar projects from the side plate along the peripheral edge, and a through hole for a screw for screwing the mounting screw into the step bar is provided at the front end. By tightening, the fitted state of the side plate to the step rail is maintained.

[0004]

[Problems to be solved by the device]

 According to the above-mentioned conventional side plate fitting device for the cross rail, although the side plate is pressed against the cross rail by the tightening force of the screw at the place where the side plate hits the strut, the tightening force is increased as it goes to the rear end portion protruding from the strut. Since it becomes weak, it is difficult for the side plate to come into close contact with the wood mouth of the step rail at the protruding part, and even if the connection with the step rail is strengthened so that it will be fitted by hitting it, the fitting piece to be hammered in will have elasticity, so transport If something else gets caught at the rear end that is protruding at times, there is a problem that the fitting piece will come off and a gap will be unsightly at the mouth of the step pier, resulting in poor product value.

In view of the above-mentioned circumstances, the present invention provides a strong connection so that the side plate does not bend due to the elastic force on the rail, so that there is a gap in the mouth of the rail even at the rear end protruding from the column. It is an object of the present invention to provide a side plate fitting device for a step rail in a step ladder that does not exist.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a stepladder in which the step rail is formed in a wide hollow so as to project rearward from the post, and the step rail is screwed to the post via the side plate. A structural feature is that a screw pocket-shaped shaft pocket that opens to the front is formed in the front side, and an insertion shaft that tightly fits into the shaft pocket is provided on the side plate. Further, a supporting piece may be provided on the side plate so as to project together with the inserting shaft, and the supporting piece may be formed integrally with the inserting shaft so as to protrude from the opening of the axial pocket.

[0007]

[Action]

 According to the above configuration, at the front end, the side plate is pressed against the wood mouth of the step rail by the tightening force of the screw to maintain the close contact state, and at the rear end protruding portion, the side plate is attached to the axial pocket of the step rail. Since the insertion shaft is fitted in such a way that it cannot be removed, a close contact is maintained even at that portion.

When an opening force is applied to the protruding portion of the side plate, the insertion shaft acts as a bending force toward the inside as a precondition for withdrawal due to the relationship with the step rail, but since the shaft pocket has a screw pocket shape, There is no room for the insertion shaft to bend flexibly in any direction, and the insertion shaft never comes out even if it is supported by the support piece so that it will not bend. As a result, it is possible to prevent the inconvenience that there is a gap in the mouth of the step rail at the protruding portion.

Further, since the shaft pocket is in the shape of a screw pocket with a partial opening, it is possible to press-fit the insertion shaft into it, unlike when it is completely closed. The connection of the side plates can be strengthened.

[0010]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

The drawings show an embodiment, in which a step bar 3 is fastened to a column 1 via a side plate 5 thereof by a pair of upper and lower mounting screws 11, 11. Although the step S is a folding type with the tread 7, the type is not particularly limited in the present invention.

The column 1 and the cross rail 3 are extruded aluminum members. Among them, the column 1 is formed into a hollow having a rectangular cross section, and a groove 9 is provided in the width center of the outer surface. Inserting holes 13 and 13 of the upper and lower mounting screws 11 and 11 are formed in the inner wall and through holes 15 and 15 are provided in the inner wall, and the mounting screw 11 is tightened in the through holes 15.

Regarding the cross-sectional shape of the cross rail 3, the front wall 19 that is substantially flush with the front surface 17 of the support column 1, the top wall 21 that protrudes rearwardly beyond the support column 1 and serves as a tread surface, and the front wall 19 are formed. It is formed in a hollow space surrounded by a rear wall 23 having a length of about half, a lower wall 25 slightly narrower than the width of the column 1, and a lower wall 27 curved between the rear wall 23 and the lower wall 25. Is a protruding portion 8 from the column 1.

A reinforcing wall 30 that is interposed between the upper wall 21 and the lower wall 27 is formed on the projecting portion 8 of the step rail 3, and mounting screws 11, 11 are attached to the upper wall 21 and the lower wall 27 at the front end. Screw pockets 29, 29 for screwing in are provided, and a shaft pocket 31 is provided on the inner surface of the rear wall 23.

The shaft pocket 31 is formed in the same shape as a bisque pocket by protruding both side pieces 32, 32 that are curved in an arc shape, and has an opening 34 toward the front.

The side plate 5 has a shape conforming to the outer edge of the wood entrance 4 so that the wood entrance 4 of the foot rail 3 can be concealed, and a fitting piece 33 for protruding into the foot rail 3 is provided along the peripheral edge thereof. At the same time, the fitting piece 33 is provided with notches 35, 36 at positions corresponding to the screw pockets 29, 29, the reinforcing wall 30, and the shaft pocket 31.

Further, the side plate 5 is provided with through holes 12, 12 for the mounting screws 11, 11 at the front end portion thereof, and at the rear end portion thereof, an insertion shaft 37 into the shaft pocket 31 of the step rail 3 and a supporting piece 39 thereof. And the support piece 39 is formed integrally with the insertion shaft 37 so as to protrude from the opening 34 of the shaft pocket 31. Further, at the place where the insertion shaft 37 protrudes, a circular recess 41 is provided so as to surround the insertion shaft 37. The recess 41 prevents the side plate 5 from hitting the end of the shaft pocket 31. The adhesion is improved.

The insertion shafts 37 are formed to have substantially the same dimensions so as to be driven into the shaft pockets 31, and notch grooves 45 are formed in four equal directions from the center so that the insertion can be made, and the insertion shaft 37 has a cross-shaped cross section. . By the way, since the excessive portion of the insertion shaft 37 which does not fit the dimension is scraped off by the concave portion 41 and the notch groove 45, the driving does not become impossible on the way.

The support piece 39 has a plate shape as an extension of a cross-shaped piece of the insertion shaft 37, and is formed to have a thickness sandwiched by the opening 34 in order to strengthen the connection with the shaft pocket 31. Further, the side edge 47, which is the extended end, is inclined and formed narrow at the tip.

Even if another object is caught at the rear end of the side plate 5 and a force P for removing it is applied (see FIGS. 3 and 4), the opening becomes the fulcrum at the rear end edge 49 of the step rail 3. Therefore, the insertion shaft 37 is bent inward (in the direction of arrow Q) due to the relation with the step rail 3, but is never bent in the direction Q due to the connection with the shaft pocket 31 and the reinforcement by the support piece 39. Since there is no side plate 5, the side plate 5 does not open and maintains close contact with the wood port 4 of the step rail 3.

[0021]

[Effect of the device]

 As described above, according to the present invention, the screw pocket-shaped shaft pocket that opens forward is formed on the inner surface of the rear end of the step rail, and the side plate has the insertion shaft that is closely fitted to the shaft pocket and the supporting piece thereof. And the support piece is formed integrally with the insertion shaft so as to protrude from the opening of the shaft pocket, the connection between the side plate and the step bar is strengthened even at the part protruding to the rear of the step bar, and the support piece is inserted from the shaft pocket. Since the shaft never comes off, it is possible to reliably prevent the inconvenience of having an unsightly opening in the wood entrance of the step, and it is extremely effective in increasing the commercial value of the stepladder. In addition, since it is fitted tightly without using screws, the head of the screws does not come out and the appearance is good.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of the present invention.

FIG. 2 is a perspective view of a stepladder.

FIG. 3 is an enlarged cross-sectional view of the embodiment taken along the line AA of FIG.

FIG. 4 is an enlarged sectional view taken along the line BB of FIG.

FIG. 5 is a partially enlarged view of the embodiment showing the inner surface of the side plate.

[Explanation of symbols]

 1 Support post 3 Step rail 5 Side plate 31 Shaft pocket 34 Opening 37 Insertion shaft 39 Support piece

Claims (2)

[Scope of utility model registration request] 1. The step rail (3) is formed in a wide hollow so as to project rearward from the support column (1), and the step rail (3) is screwed to the support column (1) with a side plate (5) interposed. In the stepladder, a screw pocket-shaped shaft pocket (31) opening forward is formed on the inner surface of the rear end of the step rail (3), and the side plate (5) has an insertion shaft (37) tightly fitted into the shaft pocket (31). ) Is provided so as to project from the side plate fitting device of the step rail in the stepladder. 2. The step rail (3) is formed in a wide hollow so as to project rearward from the support pole (1), and the step rail (3) is screwed to the support pole (1) with a side plate (5) interposed. In the stepladder, a screw pocket-shaped shaft pocket (31) opening forward is formed on the inner surface of the rear end of the step rail (3), and the side plate (5) has an insertion shaft (37) tightly fitted into the shaft pocket (31). ) And its supporting piece (39) are provided so as to project, and the supporting piece (39) is formed integrally with the insertion shaft (37) so as to protrude from the opening (34) of the shaft pocket (31). A side plate fitting device for a step rail in a stepladder.