JPH11131958A - Stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of collapse of stepladders in a stack when a number of stepladders are laid and vertically stacked by a method wherein lamination guide blocks having recessed and protrusion parts engaged with each other are fixed on the vertical overlapping surfaces of a plurality of stepladders. SOLUTION: Laminate guide blocks 6 are fixed on overlapping surfaces 3a of pedestals 3 when the two leg parts of the stepladder are folded in parallel and laminated together in a laying state. The lamination guide block 6 has a block body 6c long along the longitudinal direction of the stepladder and width slightly narrower than that of the pedestal 3. A recessed part 6a being an elongated conical hole and a protrusion part 6b being an elongated conical protrusion, in the same shape in cross section as each other, are formed on the block body 6c. The recessed part 6a and the protrusion part 6b are formed at the front and in the rear in a longitudinal direction on overlapping surfaces 3a of an upper pedestal 3 and a lower pedestal 3, which are vertically overlapped with each other, and in this state, the lamination guide block 6 is fixed at the pedestal 3 by a blind rivet 14. When the stepladders are stacked, the lamination guide blocks 6 are fitted in each other and cargo collapse is prevented from occurring caused by displacement in the lateral direction and reliable stacking in a proper arrangement state is practicable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepladder laminated structure suitable for stacking a plurality of known stepladders on top of one another.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional stepladder of this type is opened to the left and right around a pivot bracket 1, which is the uppermost pivot point, and stands up. It consists of a pair of legs 2, 2 which are closed in an anastomosed and folded state, and the pair of left and right legs 2, 2 are respectively suspended between a pair of front and rear legs 3, 3 and both legs. It has a step 4 and pillar end pieces 5, 5 attached to the lower ends of both pillars. A foldable support bar 12 is appropriately mounted between the two legs 2.

When the pair of left and right legs 2, 2 is folded, the legs 2, 2 are in a parallel state as shown in FIG.

As shown in FIG. 2, the stepladder A in a state where the two leg portions 2 are folded in a parallel state is stacked one on top of the other in a state of being laid down as shown in FIG. Although it is stored, it is assumed that a large number of stepladders A stacked in the course of laminating work or during transportation are collapsed in the width direction and collapsed, and the laminated state is destroyed, or the laminating state is unstable even if it is not collapsed. Many things have happened.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when a large number of stepladders are laid on each other and laid one above the other as described above, each stepladder is aligned on the same surface so as not to collapse. The purpose is to be able to do.

[0006]

In order to achieve the above-mentioned object, the present invention will be described with reference numerals in the drawings. And a pair of legs 2 which are opened in a V-shape to the left and right to form an upright state, are closed so as to be anastomosed and are closed and folded, and a pair of left and right legs 2 In a stepladder A having a pair of pillars 3, a step 4 suspended between the pillars and a pillar end piece 5 attached to the lower ends of the pillars, each leg of the plurality of stepladders A in a folded state. In stacking the pillars 3 vertically one above the other, the concave and convex portions 6a and 6b which engage with each other when the respective pillars 3 are overlapped on the upper and lower overlapping surfaces 3a of the respective pillars 3.
Is formed by adhering the laminated guide piece 6 having the above structure.

In the invention according to claim 2, a laminated guide piece 6 in which a concave portion 6a and a convex portion 6b are provided adjacent to each other at the rear end in the longitudinal direction along the pillar 3 is provided on each pillar 3. When being fixed, the laminated guide pieces 6
The concave portions 6a and the convex portions 6b are arranged rearward in the longitudinal direction, that is, the concave / convex portions are alternately reversed in the longitudinal direction so that the laminated guide pieces 6 are fixed. Item 1 is configured.

According to the third aspect of the present invention, the concave portion 6a and the convex portion 6b are provided adjacent to each other at the rear end in the longitudinal direction along the pillar 3 in the laminated guide piece 6. 3. The structure according to claim 1, wherein a regulating projection for regulating the rear end arrangement of the laminated guide piece and fixing the laminated guide piece to the pillar is protrudingly provided on the back side of the laminated guide piece. It is.

According to the fourth aspect of the present invention, the upper and lower pivot points 1 are opened to the left and right in a C-shape around the uppermost pivot point 1 so as to be in an upright state. And a pair of left and right legs 2, respectively, a pair of front and rear pillars 3, a step 4 suspended between the two pillars, and a pillar end piece attached to the lower ends of the two pillars. In the stepladder having the step 5, the respective pillars 3 and the pillar end pieces 5 of the plurality of stepladders 2 in a folded state are vertically overlapped and stacked. The projections and recesses 8 and 9 are formed on the mating surface 5a so as to engage with each other when the pillar end pieces 5 are overlapped.

Further, in the invention according to claim 5, when each of the pillar end pieces 5 is anastomosed to the anastomotic surface 5b of each of the pillar end pieces 5 of the leg portion 2 in the folded state, the concave and convex engagement with each other. The unevenness portions 10 and 11 are formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
Referring to the drawings, since the structure of the stepladder A itself is the same as that described in the section of the prior art, the description of each component will be omitted, and in the embodiment of the present invention, the pivot point which is the pivot point will be described. As shown in FIG. 1, a pair of legs 2, 2 opening and closing right and left around a bracket 1, as shown in FIG.
The stacking guide piece 6 is fixed to the vicinity.

More specifically, as shown in FIG. 2, when the pair of left and right legs 2, 2 is folded, each of the legs 2, 2 is folded.
Are in a parallel state to be low in volume.

As shown in FIGS. 2 and 3, each of the pillars 3 when the stepladder A having the two legs 2, 2 folded in a parallel state is laid on top of each other while being laid down as shown in FIGS. The lamination guide piece 6 is fixed to the overlapping surface 3a.

As shown in FIGS. 5 and 6, the laminated guide piece 6 has a slightly longer length along the longitudinal direction of the pillar 3 and a width slightly smaller than the width of the pillar 3. A concave portion 6a and a convex portion 6b are formed adjacent to each other in the longitudinal direction near the center of the frame main body 6c, and rivet holes 13 are formed on both sides of the concave and convex portions 6a, 6b. ing. The cross-sectional shapes of the concave portion 6a and the convex portion 6b are the same. If the former is a horizontally long conical hole, the latter is a horizontally long conical projection.

As shown in FIG. 6, a regulating projection 7 having a role to be described later protrudes from a rear surface side of the frame main body 6c at a position slightly deviated in a longitudinal direction from a central portion thereof.

As shown in FIG. 4, an upper pillar 3 and a lower pillar 3 of a stepladder A, which are vertically stacked, have a recessed surface 6a in the longitudinal direction thereof. The laminated guide piece 6 is fixed to the pillar 3 from the rivet hole 13 by a blind rivet 14 (FIG. 4) so that the convex portion 6b comes to the rear end. In FIG. 4, the concave portion 6a of the upper laminated guide piece 6 is at the front, and the convex portion 6b is at the rear,
On the other hand, the lower guide member 6 has the convex portion 6b at the front and the convex portion 6b at the rear. Accordingly, as described above, the cross-sectional shapes of the concave portion 6a and the convex portion 6b are the same, and if the former is a horizontally long conical hole, the latter is a horizontally long conical protrusion, so that the stepladder A is vertically stacked. The upper and lower stacked guide pieces 6 can be fitted and engaged with each other, so that the stepladders A stacked in a multi-stage form are not shifted laterally due to the role of the stacked guide pieces 6 to cause load collapse. The layers can be reliably stacked in a straightened state.

Also, as shown in FIG.
In other words, when the laminated guide pieces 6 are fixed to each other, in other words, the laminated guide pieces 6 in which the concave portions 6a and the convex portions 6b are provided adjacent to each other at the rear end in the longitudinal direction along the pillar 3
In order to fix the concave and convex portions, the concave portions 6a and the convex portions 6b of the laminated guide piece 6 are arranged rearwardly in the longitudinal direction for each of the front and rear pillars 3, that is, the concave and convex portions alternate in the longitudinal direction. The stacking guide pieces 6 are fixed to each other. More specifically, as shown in FIG. 3 and particularly in FIG. 7, the front pillar 3 (indicated by “a”) has a concave portion 6 a on the pivot bracket 1 side, that is, on the front side, and a convex portion 6 b has a pillar end member. 5 side, that is, the laminated guide piece 6 is fixed to the pillar 3 so as to come to the rear side,
On the other hand, in the rear pillar 3 (indicated by b), the convex portion 6b is on the pivot bracket 1 side, that is, on the front side, and the concave portion 6a is on the pillar post end 5 side, that is, on the rear side. Thus, the laminated guide piece 6 is inverted and fixed to the pillar 3.

As described above, the front pillar 3 and the rear pillar 3
By stacking a large number of stepladders A by stacking a large number of stepladders A by fixing the laminated guide pieces 6 to the respective pillars 3 such that the longitudinal ends of the concave portions 6a and the convex portions 6b are arranged in reverse. Concavo-convex portions 6 of laminated guide piece 6 fixed to front pillar 3 (shown by a) and rear pillar 3 (shown by b), respectively.
a, 6b are concave and convex portions 6a, 6b of the lower laminated guide piece 6;
Automatically match with the upper and lower concave and convex portions 6a, 6a
It is not necessary to pay attention to make b coincide with each other, so that the laminating operation can be performed efficiently. Of course, the laminated guide piece 6 may be fixed to the pillar 3 so that the longitudinal end of the concave portion 6a and the convex portion 6b are the same on both of the front and rear pillars 3. In this case, In this case, the laminating operation must be performed with great care so that the concave and convex portions 6a and 6b of the upper and lower laminating guide pieces 6 match each other.

As described above, the laminated guide pieces 6 are arranged such that the longitudinal rear ends of the concave portions 6a and the convex portions 6b are arranged in the front pillar 3 and the rear pillar 3 in reverse. 3, it is necessary to adhere to the uneven portions 6a, 6
Since the efficiency cannot be improved by fixing to the pillar 3 while confirming the direction of each of the b, in the embodiment of the present invention, as shown in FIG. The order of the leading arrangement is precisely regulated in advance, and the stacked guide pieces 6
Are formed on the rear surface of the laminated guide piece 6 so that the protrusions 7 are fixed to the pillars 3, and the restriction holes 15 into which the protrusions 7 are fitted.
(FIG. 4) is drilled in each pillar 3.

As a result, the laminated guide piece 6 is connected to each pillar 3
When fixing to the same position from the end face of the
By fixing the laminated guide piece 6 at a position where the laminated guide piece 6 fits into the regulating hole 15, the laminated guide piece 6 is automatically formed in a state in which the longitudinal rear ends of the concave portions 6a and the convex portions 6b are accurately regulated. Since it is fixed to the pillar 3, the efficiency in the manufacturing stage can be increased accordingly.

FIGS. 8 and 9 show another embodiment of the present invention. In a stepladder having a pillar end piece 5 attached to lower ends of both pillars 3, 3, a plurality of folded stepladders 2 are provided. When each of the pillars 3 and the pillar end pieces 5 are vertically overlapped and laminated, when each pillar end piece 5 is overlapped on the upper and lower overlapping surfaces 5a of the respective pillar end pieces 5, Concavo-convex portions 8 and 9 are formed so as to engage with each other. Further, when each pillar end piece 5 is anastomosed to the anastomotic surface 5b of each pillar end piece 5 of each leg 2 in the folded state, the projections and recesses are mutually engaged. The concave and convex portions 10 and 11 are formed.

If the recess 8 is formed in the overlapping surface 5a of the pillar end piece 5 on one side of the front and rear pillar end pieces 5, the overlapping surface 5a of the pillar end piece 5 on the other side is formed. Is formed with a convex portion 9. In addition, a concave portion 1 is formed in the anastomotic surface 5b of the one pillar end piece 5.
When 0 is formed, the convex portion 11 is formed on the anastomotic surface 5b of the other pillar end piece 5.

For this purpose, the respective pillars 3 and the pillar end pieces 5 of the plurality of stepladders 2 in a folded state are vertically stacked one upon another, whereby the respective overlapping surfaces 5a of the upper and lower pillar pillar end pieces 5 are stacked. The uneven portions 8 and 9 provided on the side are fitted to each other, and as described above, the collapse of the load is measured by the engaging action of the upper and lower uneven portions 6a and 6b by the laminated guide piece 6 on the pivot bracket side of the stepladder A as described above. ,
On the side of the step pillar end 5 of the stepladder A, the collapse of the load is prevented by the engaging action of the concave and convex portions 8 and 9 provided directly on the step pillar end 5, and the single stepladder A itself is also positioned before and after each step. The pillar end pieces 5 prevent the pillars 3 and 3 from becoming stiff by the engagement of the concave and convex portions 10 and 11 provided on the anastomotic surface 5b of each other, and these concave and convex portions 6a, 6b,
The synergistic engagement of 8, 9, 10, and 11 has an advantage that the stacked state of a large number of stepladders A can be reliably maintained in a regular state.

[0024]

According to the first aspect of the present invention, when the stepladder is stacked up and down, the upper and lower stacked guide pieces can be engaged with each other so as to fit each other, and the stepladders stacked in a multi-stage form are formed of the stacked guide pieces. The load can be securely stacked without being displaced in the lateral direction due to the engaging action of the concave and convex portions and causing collapse of the load.

According to the second aspect of the present invention, when stacking a large number of stepladders, without paying attention to the front and rear sides of the stepladder, the stacked guide pieces fixed to the upper front pillar and the rear pillar, respectively. Since the concave and convex portions automatically match the concave and convex portions of the lower stacking guide piece, it is not necessary to pay attention so that these upper and lower concave and convex portions match each other, so that the laminating operation can be performed efficiently.

According to the third aspect of the present invention, when the laminated guide piece is fixed to each pillar at the same position from its end face,
By fixing the laminated guide piece at the position where the regulating protrusion fits into the regulating hole, the laminated guide piece is automatically adjusted to the pedestal in a state where the direction of the rear end in the longitudinal direction of the concave portion and the convex portion is accurately regulated. Since it is fixed, the production efficiency in the production stage can be increased accordingly.

According to the fourth aspect of the present invention, each of the plurality of stepladders in a folded state and the pillar end pieces are vertically stacked one upon another, thereby stacking the upper and lower pillar end pieces. The concave and convex portions provided on the surface are fitted to each other, and as a result of these engaging actions, load collapse can be prevented as much as possible.

According to the fifth aspect of the present invention, the single stepladder itself is twisted by the engaging action of the concave and convex portions provided on the anastomotic surfaces 5b of the front and rear pillar end pieces. And deviation can be prevented.

According to the sixth aspect, the collapse of the load is prevented by the engaging action of the laminated guide piece on the pivot bracket side, and the uneven portion directly provided on the pillar end piece is engaged on the pillar end piece side. The action prevents the collapse of the load, and the synergistic action of the two eventually ensures that even if a large number of stepladders are stacked, the stacked state can be reliably maintained and the layers can be stably stacked.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stepladder according to an embodiment of the present invention.

FIG. 2 is a front view showing a state where a large number of stepladders are stacked.

FIG. 3 is a plan view of the same.

FIG. 4 is an enlarged view of a portion surrounded by IV in FIG. 2;

FIG. 5 is a perspective view of the main part.

FIG. 6 is a sectional view of the main part.

FIG. 7 is an enlarged view of a portion VII in FIG. 3;

FIG. 8 is an enlarged front view of another main part.

FIG. 9 is a side view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pivot point 2 Leg part 3 Pillar 3a Stacking surface 4 Step beam 5 Pillar end piece 5a Stacking surface 5b Anastomosis surface 6 Stacking guide piece 6a Depression 6b Convex part 7 Restriction protrusion 8 Recess part 9 Convex part 10 Recess part 11 Convex part

Claims (6)

[Claims] 1. A pair of legs which are opened in a C-shape from right to left around a pivot point at the uppermost position to be in an upright state, closed so as to be anastomosed and folded in a folded state, and Each of the pair of legs includes a pair of front and rear pillars, a step board suspended between the two pillars, and a pillar end member attached to the lower ends of the two pillars. When stacking the pillars vertically one above the other, a stacking guide piece that has uneven portions that engage and recess with each other when the respective pillars are overlapped is formed on the upper and lower overlapping surfaces of each pillar. A stepladder characterized by being fixed. 2. A stacking guide piece having a concave portion and a convex portion provided adjacent to each other at a longitudinal rear end thereof along a pillar is fixed to each pillar, and a stacked guide piece is provided for each of the front and rear pillars. The laminated guide piece is fixed so that the concave portions and the convex portions are arranged in a rearwardly-facing arrangement in the longitudinal direction, that is, the concave and convex portions are alternately reversed in the longitudinal direction. Stepladder described. 3. The laminated guide piece is fixed to the pillar by regulating the rearward arrangement of the concave and convex parts of the laminated guide piece provided with the concave part and the convex part adjacent to each other at the longitudinal rear end along the pillar. The stepladder according to claim 1 or 2, wherein a regulating protrusion is provided on a rear surface side of the laminated guide piece. 4. A pair of legs which are opened in a C-shape to each other around a pivot point at an uppermost position to be in an upright state, and are closed so as to be anastomosed to be in a folded state. Each of the pair of legs includes a pair of front and rear pillars, a step board suspended between the two pillars, and a pillar end member attached to the lower ends of the two pillars. When each of the pillars and the pillar end pieces are vertically overlapped and stacked, the upper and lower overlapping surfaces of each pillar end piece are engaged with each other when the respective pillar end pieces are overlapped. A stepladder characterized by forming irregularities. 5. The method according to claim 4, wherein the anterior and posterior end portions of the leg portion in the folded state are formed on the anastomotic surfaces of each of the anterior and posterior end portions with concave and convex portions which engage with each other when the respective column end portions are anastomosed. stepladder. 6. The stepladder according to claim 4, wherein a laminated guide piece is provided on the pivot point side of the pillar.