JP6831608B1 - ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ladder capable of surely preventing a user or the like from falling down even when he / she rides on a stepping member at the uppermost part of the ladder and performs work. SOLUTION: The ladder 1 is capable of performing work with a user on it, and has a length shorter in the longitudinal direction than a first ladder member 3 and a first ladder member 3, and a second upper end portion. A second ladder member 5 having 5a, a support member 17 located above the second upper end 5a and provided on the first ladder member 3 to support the user's knee, and a first ladder. A first stepping member 31 provided on the member 3 for resting the user's foot and a second stepping member provided on the second upper end portion 5a of the second ladder member 5 for resting the user's foot. The first and second positions are such that the user's knees are supported by the support member 17 in a state where the user's feet are placed on the first and second stepping members 31, 51. The stepping members 31 and 51 and the support member 17 are provided, and the first and second ladder members 3 and 5 are arranged symmetrically with respect to the virtual center line X extending in the vertical direction. [Selection diagram] Fig. 1

Description

The present invention relates to a ladder with a workbench used when working on a building such as an apartment house or a detached house.

For example, the hinge ladder disclosed in Patent Document 1 includes a rudder 1, a stand 3 connected to the rudder 1 via a hinge 5, a platform 10 supported by the rudder 1 and the stand 3, and a pair constituting the rudder 1. The platform 10 is connected to the rudder 1 by the first hinge 12 and to the crossbar 9 of the stand 3 by the tie rod 40, further comprising an upper cross 8 connecting the upper ends of the side rails 2 of the platform 10. It is configured to be connected to the platform 10 by the second hinge 41 and to the crossbar 9 by the third hinge 42.

European Patent Office 0457703

Patent Document 1 does not specify how the user rides on the hinge ladder and how the user uses the hinge ladder. However, considering the dimensional relationship of the members constituting the hinge ladder, it is presumed that the user puts one foot on the platform 10 and works in a state where the waist or thigh is in contact with the upper cross 8.

However, in the hinge ladder having this configuration, since the stand 3 extends in the vertical direction, when a load is applied to the upper cross 8 through the thigh, an urging force acts on the stand 3 side, and the hinge ladder is expected. There is a risk of falling without.

The present invention has been made in view of such circumstances. That is, an object of the present invention is to provide a ladder that can surely prevent a user or the like from falling down even when he / she rides on the uppermost stepping member and performs work in order to solve the above problems. ..

In order to solve the above-mentioned problems and achieve the object, the first aspect of the ladder of the present invention is a ladder on which the user can work while riding.
The first ladder member and
A second ladder member having a length shorter in the longitudinal direction than the first ladder member and having a second upper end portion, and a second ladder member.
A support member located above the second upper end and provided on the first ladder member to support the user's knees.
A first stepping member provided on the first ladder member for resting the user's foot, and
A second stepping member provided at the second upper end portion of the second ladder member and on which the user's foot is placed is provided.
With the user's feet resting on the first and second stepping members, the positional relationship in which the user's knees are supported by the support member is set between the first and second stepping members and the said The support member and the first and second ladder members are arranged symmetrically with respect to a virtual center line extending in the vertical direction.

Further, according to the second aspect of the ladder of the present invention, the ladder of the first aspect includes grounding maintenance means provided on at least one of the bottom legs of the first and second ladder members. All of the first and second ladder members can be grounded by the grounding maintenance means.

According to the third aspect of the ladder of the present invention, the ladder of the second aspect, the ground contact maintaining means is a convex portion protruding to the outside of the bottom leg portion.

According to the fourth aspect of the ladder of the present invention, the ladder of the third aspect, the ground contact maintaining means has an urging means for urging the convex portion downward.

According to the fifth aspect of the ladder of the present invention, the ladder according to any one of the first to fourth aspects, the first upper end portion of the first ladder member is stretchable in the longitudinal direction thereof. It is equipped with a telescopic means.

According to the ladder of the present invention, when the foot rests on the first and second stepping members, the knee is supported by the support member. Therefore, when the user works, the foot is supported by the support member. At the same time, the load is evenly applied to the first and second ladder members, and it is possible to prevent the ladder from unexpectedly tipping over.

(A) is a perspective view of the ladder according to the first embodiment of the present invention, and (b) is a back perspective view of the ladder shown in FIG. 1 (a). (A) is a cross-sectional view taken along the line IIA of FIG. 1 (a), and FIG. 1 (b) is an arrow view of IIB of FIG. 1 (b). (A) is a side view of the ladder shown in FIG. 1, and (b) is a front view of the ladder shown in FIG. (A) is a rear view which shows the convex part of the ladder and the related member which concerns on 2nd Example of this invention, (b) is the sectional view along the line IV-IV of FIG. 4 (a). Is. (A) is a perspective view showing a state in which the ladder according to the second embodiment is arranged on the veranda, and (b) is an enlarged view of a portion surrounded by the alternate long and short dash line V in FIG. 5 (a). ..

The ladder according to the embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same parts are indicated by the same reference numerals. It goes without saying that the examples described below are given as examples and do not limit the present invention.

[First Example]
1 (a) is a perspective view of the ladder 1 according to the first embodiment of the present invention, and FIG. 1 (b) is a rear perspective view of the ladder 1 shown in FIG. 1 (a). 2 (a) is a cross-sectional view taken along the line IIA of FIG. 1 (a), FIG. 2 (b) is an IIB arrow diagram of FIG. 1 (b), and FIG. 3 (a) is FIG. It is a side view of the ladder 1 shown in FIG. 3, and FIG. 3B is a front view of the ladder 1 shown in FIG.

The ladder 1 that supports the user's foot in this embodiment mainly includes a first ladder member 3, a second ladder member 5 connected to the first ladder member 3, and a first upper end portion 3a side. A support member 17 for supporting the user's knee, a first stepping member 31 provided on the first ladder member 3 for supporting the user's foot, and a second ladder member 5 are provided. A second stepping member 51 for supporting the user's foot is provided. Further, the first and second stepping members 31 and 51 constituting the workbench are arranged adjacent to each other so that the user's knees are supported by the support member 17 when the user's feet are on the workbench. It has a positional relationship between the first and second treading members 31, 51 and the support member 17. Further, as shown in FIG. 3A, the first and second ladder members 3 and 5 are arranged symmetrically with respect to the virtual center line X extending in the vertical direction.

As shown in FIG. 3B, the first ladder member 3 has a symmetrical shape in a front view, and has a lower ladder portion 33 and an upper ladder portion 35 continuous with the upper end portion of the lower ladder portion 33. Has. The lower ladder portion 33 expands as it goes down, and the upper ladder portion 35 extends in the vertical direction. Therefore, the first step 39 connecting the two lower ladder portions 33 has a longer longitudinal dimension than the second step 37 located vertically above the first step 39. On the other hand, the first step member 31 connecting the two upper ladder portions 35 and the support member 17 located above the first step member 31 are dimensioned in the longitudinal direction slightly shorter than in the second step 37. Has been done.

Further, as shown in FIG. 2, a bottom leg portion 11 is attached to the lower end portion of the first ladder member 3. The bottom leg portion 11 includes a convex portion 7 and a slip stopper portion 13 as shown in FIG. 2 (b). The convex portion 7 which is the ground contact maintaining means has a circular hemispherical shape in the back view of FIG. 2B, and is projected from the slip stopper 13 by a length t in the vertical direction to the slip stopper 13. It is installed. The anti-slip portion 13 has a plurality of recesses and is configured to prevent unexpected slippage on the floor surface of a corridor, a veranda, or the like.

The convex portion 7 has a semicircular spherical portion 7a and a cylindrical base portion 7b continuous with the semicircular spherical portion 7a, and the cylindrical base portion 7b is held by the inside of the anti-slip portion 13 and the lower end portion of the first ladder member 3. ing. The convex portion 7 is made of low-hardness silicone rubber. It is desirable that the convex portion 7 has a strength such that the semicircular spherical portion 7a is slightly bent (flexed) by the weight of the ladder 1 when the ladder 1 is placed on the ground.

As shown in FIG. 2A, the hemispherical portion 7a is arranged outside the slip stopper 13 (in FIG. 3A, a position farther from the virtual center line X than the slip stopper 13). is there. Further, in the used state where the first and second ladder members 3 and 5 are opened, the virtual center line C of the semicircular spherical portion 7a is extended so as to be inclined with respect to the virtual vertical line Q extending in the vertical direction. .. In the dormant state in which the first and second ladder members 3 and 5 are closed, the virtual center line C of the hemispherical portion 7a is aligned with the virtual vertical line Q extending in the vertical direction.

When the first ladder member 3 is placed on the floor surface of the convex portion 7 having the above configuration, the convex portion 7 first comes into contact with the floor surface, and the convex portion 7 bends due to the weight of the ladder 1. Further, when the user rides on the first and second steps 39 and 37 of the first ladder member 3, the convex portion 7 is crushed and the anti-slip portion 13 comes into contact with the ground.

Further, a grip portion 9 is provided at the upper end portion 3a (see FIG. 1A) of the upper ladder portion 35 of the first ladder member 3. The grip portion 9 is nested in the internal space of the upper ladder portion 35, and the grip portion 9 is slidable with respect to the upper ladder portion 35. Further, the grip portion 9 is provided with fixing holes at predetermined intervals in the longitudinal direction, and the fixing protrusions mounted on the upper ladder portion 35 are inserted into the fixing holes, so that the grip portion 9 is provided. Is fixed in place. Note that FIG. 1A shows a state in which the grip portion 9 protrudes, and FIG. 1B shows a state in which the grip portion 9 is housed inside the upper ladder portion 35.

Further, as shown in FIG. 3B, the grip portion 9 and the upper ladder portion 35 extend along the virtual vertical straight line Y extending in the vertical direction, and the lower ladder portion 33 moves away from the virtual vertical straight line Y. It is spread to. According to this configuration, when the protrusion length of the grip portion 9 from the upper end portion 3a of the upper ladder portion 35 is the shortest, the lower end portion of the grip portion 9 is locked by abutting on the inner surface of the lower ladder portion 33. .. In the above description, the first ladder member 3 exhibits a symmetrical configuration with respect to the virtual vertical line Y, as shown in FIG. 3A.

Next, the second ladder member 5 will be described. If the configuration of the second ladder member 5 is the same as the configuration of the first ladder member 3, the description thereof will be omitted. The second ladder member 5 includes a lower ladder portion 53, an upper ladder portion 55 connected to the lower ladder portion 53, a lower step 57 connecting the left and right lower ladder portions 53 in FIG. 1A, and left and right. A second step member 51 for connecting the lower ladder portion 53 of the above and supporting the foot of the operator is provided. The second step member 51 has the same configuration as the first step member 31, and the first and second step members 31 and 51 are arranged symmetrically with respect to the virtual center line X in FIG. 3A. .. Further, as shown in FIG. 3B, the second ladder member 5 has a structure that is line-symmetric with respect to the first ladder member 3 with respect to the virtual center line X extending in the vertical direction. The first and second ladder members 3 and 5 are inclined at the same angle with respect to the virtual center line X.

Further, a bottom leg portion 11 is attached to the lower end portion of the lower ladder portion 53 of the second ladder member 5, similarly to the lower end portion of the lower ladder portion 33 of the first ladder member 3, and the bottom leg portion 11 is attached. , As shown in FIG. 2B, the convex portion 7 and the anti-slip portion 13 are provided. Therefore, in the present embodiment, the first and second ladder members 3 and 5 are configured to include the convex portion 7, and the floor (or the ground, hereinafter referred to as the floor) on which the ladder 1 is placed is assumed to be. Even if there is some unevenness, the four first and second ladder members 3 and 5 are grounded to the floor by bending the convex portion 7.

Reference numeral 41 in FIG. 1A is a storage lever. When the user lifts the storage lever 41, the linearly fixed hinge member 15 bends upward at the central portion thereof, and the first and second ladder members 3 and 5 are closed.

[Second Example]
The convex portion 107 according to the second embodiment will be described with reference to FIG. FIG. 4A is a rear view showing the convex portion 107 and related members, and FIG. 4B is a cross-sectional view taken along line IV-IV of FIG. 4A.

Unlike the first embodiment, the hemispherical convex portion 107 has a configuration in which it is urged by a coil spring 151 which is an urging means. Further, the virtual center line C passing through the center of the convex portion 107 extends in the vertical direction and is urged downward in FIG. 4 (b) by the coil spring 151, so that the ladder 1 is placed on the floor or the ground. In the non-slip state, the convex portion 107 protrudes from the slip stopper 113. Unlike the first embodiment, the material of the convex portion 107 is made of high-hardness silicone rubber, and the convex portion 107 has a strength that does not bend depending on the weight of the ladder 1.

Further, the convex portion 107 is located outside the bottom surface of the bottom leg portion 111 in a state of being installed on the floor or the like, as in the first embodiment. Further, in this embodiment, the convex portion 107 is urged by the coil spring 151, the coil spring 151 is locked to the anti-slip portion 113, and the anti-slip portion 113 is fixed to the bottom leg portion 111 by the screw 153. Will be done.

In this embodiment, when the ladder 1 is used, the virtual center line C of the convex portion 107 extends in the vertical direction, and the expansion / contraction center line in which the coil spring 151 expands / contracts coincides with the virtual center line C. .. Further, although only one bottom leg 111 is shown in FIG. 4, as in the first embodiment, in the second embodiment as well, the four bottom legs 111 provided by the ladder 1 have a convex portion 107. Is installed. Further, depending on the unevenness existing on the floor or the ground, one of the first and second ladder members 3 and 5 is provided with the convex portion 107, and the other of the first and second ladder members 3 is provided with the first convex portion 7. It is also possible to select the bottom leg portion 111 from the first and second ladder members 3 and 5 and selectively mount the convex portions 7 and 107.

5 (a) and 5 (b) are diagrams for explaining a usage situation. The ladder 1 is placed by the user on a grooved floor of a building such as a condominium, for example, from a scaffolding installed around the outer wall of the building. A groove for drainage is provided at the edge of the floor surface S1. The groove has a groove bottom surface S2 that is inclined to the right with respect to the horizontal direction, and a groove wall surface S3 that extends vertically from the groove bottom surface S2. The floor surface S1 is spread substantially horizontally. The two bottom leg portions 111 of the first ladder member 3 are placed on the floor surface S1, and the two bottom leg portions 111 of the second ladder member 5 are placed on the groove bottom surface S2.

When the ladder 1 is placed on the groove bottom surface S2 as shown in FIG. 5B, the load applied to the convex portion 107a located on the left side is larger than the load applied to the convex portion 107b located on the right side. Therefore, the coil spring 151 that supports the convex portion 107a is relatively contracted, and the bottom leg portion 111 on the right side is in a floating state, that is, the convex portion 107b on the right side is in a relatively protruding state. Therefore, according to the ladder 1, even when the ground contact surface is not horizontal, it is possible to realize a ground contact state in which all the first and second ladder members 3 and 5 are in contact with the ground. As described above, the ground contact maintaining means of this embodiment is composed of the convex portion 107 and the coil spring 151 which is the urging means.

When the worker tries to transfer from the scaffolding to the ladder 1 in the grounded state, the worker can touch the grip portion 9 with his / her hand and confirm that the ladder 1 is not rattling. Therefore, the worker can safely transfer from the scaffolding to the ladder 1. Further, when transferring from the scaffolding to the ladder 1, one grip portion 9 attached to the upper end portion 3a of the first ladder member 3 is extended, and the other grip portion 9 is contracted to perform the work. The person can easily move the foot to the second stepping member 51 while grasping the extended grip portion 9. In the above usage situation, the ladder 1 of the second embodiment has been described, but it goes without saying that the same effect can be obtained with the ladder 1 of the first embodiment. Further, for the sake of clarification of the drawing, FIG. 5 does not show the portion of the floor edge surface S4 that is continuous with the groove bottom surface S2 and extends upward in the vertical direction of the groove bottom surface S2, but is placed in the vicinity of the floor edge surface S4. It is not intended to configure the floor edge surface S4 so that the convex portions 107a and 107b to be placed slide down from the groove bottom surface S2.

In the first and second embodiments, the first and second ladder members 3 and 5 each have two configurations, but the number of the first and second ladder members 3 and 5 is appropriately set to 3 or more. Can be changed. Further, although the ladder members 3 and 5 are rectangular in cross-sectional view, it goes without saying that they can be appropriately changed to a circular shape, an elliptical shape, or a polygonal shape.

Although the examples of the present invention have been described above, the present invention is not limited to these examples, and various modifications and changes can be made within the scope of the gist thereof.

1 Ladder 3,103 First ladder member 3a, 5a Upper end portion 5,105 Second ladder member 7,107,107a, 107b Convex portion 7a Semicircular spherical portion 7b Cylindrical base portion 9 Grip portion 11,111 Bottom leg portion 13 , 113 Anti-slip portion 17 Support member 31 First step member 33, 53 Lower ladder portion 35, 55 Upper ladder portion 37 Second step 39 First step 51 Second step member 57 Lower step 151 Cylinder spring S, S1 Floor surface S2 Groove bottom surface S3 Groove wall surface S4 Floor edge surface X, virtual center line Y, Q Virtual vertical line

Claims (6)

It is a ladder that allows the user to work while riding.
The first ladder member and
A second ladder member having a length shorter in the longitudinal direction than the first ladder member and having a second upper end portion, and a second ladder member.
A support member located above the second upper end and provided on the first ladder member to support the user's knees.
A first stepping member provided on the first ladder member for resting the user's foot, and
A second stepping member provided on the second upper end portion of the second ladder member for resting the user's foot, and a second stepping member.
It is provided with a grip portion that is nestedly attached to the first ladder member and can be expanded and contracted in the longitudinal direction of the first ladder member .
In a state where the user's feet are placed on the first and second stepping members, the positional relationship in which the user's knees are supported by the support member is set between the first and second stepping members and the said. The support member has the first and second ladder members, and the first and second ladder members are arranged symmetrically with respect to the virtual center line extending in the vertical direction .
The first ladder member has an upper ladder portion and a lower ladder portion connected to each other by a bent portion, and the movement of the grip portion in the longitudinal direction of the first ladder member is locked by the bent portion. A ladder characterized by that. The ground contact maintaining means provided on at least one of the bottom legs of the first and second ladder members is provided, and all of the first and second ladder members can be grounded by the ground contact maintaining means. The ladder according to claim 1, wherein the ladder is characterized in that. The ladder according to claim 2, wherein the ground contact maintaining means is a convex portion projecting to the outside of the bottom leg portion. The ladder according to claim 3, wherein the ground contact maintaining means has an urging means for urging the convex portion downward. 4. The fourth aspect of the present invention is that when the first ladder member and the second ladder member in a used state are arranged on a horizontal ground, the urging means urges the convex portion in the vertical direction. The ladder described in . The ladder according to claim 3, wherein the bottom leg portion has a slip stopper portion, and the convex portion is arranged at a position farther from the slip stopper portion with respect to the virtual vertical line X.

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