JP3050686U - Stepladder and its anchor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a stepladder with high workability and safety which is used by being installed on a horizontal member of a wooden house under construction. SOLUTION: A stepladder body (31) is constituted as a self-supporting type by pivotally supporting a plurality of legs (21) so as to be able to open each other, and a locking tool (30) is attached to a lower end of each leg. The engaging member is provided with a fitting-shaped portion (31) that can be fitted or loosely fitted only from above at the upper part of the cross section of the horizontal member (70, 71), and that the lower end of the leg portion of the stepladder main body in the opened state is engaged. The stepladder main body is fixed on the horizontal member by fitting or loosely fitting the stopper on the adjacent horizontal member at a predetermined interval.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a stepladder and its locking device, and more particularly to a stepladder and a locking device for use in a wooden house while ensuring workability and safety during construction.

[0002]

[Prior art]

 Conventionally, tripod and quadruped structures are known for stepladders. A tripod is a self-supporting type with a pair of ladder-like legs attached to a pair of legs, and is mainly used for caring for plants. On the other hand, a quadruped stepladder is constructed as a self-supporting type by pivotally supporting two pairs of legs by a pivot axis so that they can be opened in an inverted V-shape, and the paired legs are connected to each other in a ladder shape. It has a structure and is widely and generally used because of its self-sustaining stability.

[0003] When a wooden house is built, after the groundbreaking festival is completed, foundation work is performed on a vacant lot, a planned construction site, a foundation is built on the foundation, and a wooden frame is built. . When building such a wooden frame, the building material is raised and lowered between the first and second floors during the so-called pre-construction (generally called building elevating), and workers frequently move between the first and second floors. It is necessary to move, but a quadruped stepladder is generally used for lifting and lowering building materials and moving workers.

[0004]

[Problems to be solved by the invention]

 However, the conventional stepladder was simply placed on the floor, so it was necessary to place a plywood panel on an adjacent horizontal member and raise the stepladder on it, for example, when working on the second floor. In addition, the stepladder may move during the work, causing not only poor workability but also the possibility that the worker may fall off the stepladder. In particular, if the stepladder suddenly moves during the construction on the second floor, and the worker falls off the stepladder, there is a risk of injury, and many workers enter and exit the building site before construction. This was a major problem in terms of safety.

[0005] In view of such a problem, an object of the present invention is to provide a stepladder that can improve workability and safety before building.

[0006]

[Means for Solving the Problems]

 Therefore, the stepladder according to the present invention is a stepladder that is used by being set on a horizontal member of the wooden house during construction of the wooden house, and the stepladder main body pivots so that a plurality of legs can be opened mutually. It is supported and self-supporting, and a lock is attached to the lower end of each of the plurality of legs. The lock can be fitted or loosely fitted to the upper section of the cross member only from above. The stepladder main body in the open state is fitted or loosely fitted on the adjacent horizontal member at a predetermined interval with a predetermined interval. It is characterized in that it is fixed on a horizontal member.

One of the features of the present invention is that a locking tool is attached to the lower end of each of a plurality of legs constituting the stepladder, and the locking tool is fitted or loosely fitted to the horizontal member to convert the stepladder into the horizontal member. It is fixed. Thereby, the stepladder does not move unexpectedly, and the worker can work with the stepladder with peace of mind.

Although the stepladder may be a tripod, a quadruple stepladder is preferred in consideration of the self-standing stability in working at heights. Furthermore, from a safety point of view, it is better to prevent the stepladder from suddenly opening wide for any reason. That is, the stepladder main body is composed of two pairs of legs which are pivotally supported by a pivot shaft so as to be openable in an inverted V-shape. The paired legs are connected to each other in a ladder shape, while the stepladder main body is connected. It is preferable to provide an opening stop member for restricting the opening of the legs to a predetermined angle or more. For this opening prevention member, a chain member or a plate member that can be locked between the leg portion or the ladder step facing the leg stepping direction of the stepladder main body can be used.

Although the horizontal member is usually a square member, the present invention can be applied to a shape other than the square member, for example, a round member. Also, when the horizontal material is 4 or 3 dimensions and 5 minutes angle, manufacture the locking device corresponding to two kinds of dimensions, replace it according to the size and fit the locking device to the horizontal material. Alternatively, a loose fitting may be used, or a fitting corresponding to a four-dimensional square may be used, and in the case of a three-dimensional five-minute square, fitting or loose fitting may be performed with a gap left. However, in the latter case in particular, there is a concern that the locking device may rise from the horizontal member. Therefore, it is preferable to provide a retaining member with a retaining member for preventing the engaging member from floating from the fitted or loosely fitted horizontal member.

The retaining member may be a screw member, such as a thumb screw or a bolt, which is attached to one end of the locking member so as to advance and retreat, and presses the horizontal member toward the other end of the locking member. Alternatively, a chain member, a wire member (for example, a rope or a wire), or a plate member that can be detachably attached to the locking member so as to cover a lower portion of the horizontal member may be used. In the case of a plate material, it is bent so as to cover the lower half of the horizontal member, one end of which is pivotally supported on one end of the locking member, and the other is detachably engaged with the other end of the locking member. Is good.

Further, the concept of the present invention can be applied to an existing stepladder. That is, according to the present invention, a plurality of legs are pivotally supported by a pivot shaft so as to be mutually openable, and are configured to be self-supporting. A locking member attached to the lower end of each leg portion of a stepladder to be installed and used, wherein the locking member body has a fitting shape that can be fitted or loosely fitted to the upper cross section of the horizontal member. A pair of brackets are formed on the upper surface of the locking tool main body so as to be spaced apart from each other and protrude upward in a direction in which the lower members of the legs are fitted in the direction in which the horizontal member extends. A locking tool for a stepladder can be provided, characterized in that an insertion hole is formed so as to match with an insertion hole formed in a lower end of each of a plurality of legs, and through which an attachment is inserted. The material of the fastener is not particularly limited, and for example, an aluminum alloy, another metal material, or a synthetic resin material can be used. Further, it is preferable that this locking tool is also provided with the above-mentioned retaining member.

[0012]

[Effects of action and invention]

 According to the present invention, a lock is provided at the lower end of each leg of the stepladder, and the lower end of each leg is fixed by fitting the lock to the horizontal member from above, so that the stepladder moves unexpectedly. Therefore, the worker can use the stepladder with peace of mind. As a result, it is possible to raise and lower building members between the first and second floors, move workers, and work at heights efficiently, not only to greatly improve workability, but also to ensure that workers fall. Safety can be greatly improved.

[0013] In particular, when the opening preventing member or the floating preventing member is provided, the stepladder can be securely fixed to the horizontal member, so that workability and safety can be further improved.

[0014]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in detail based on a specific example shown in the drawings. 1 to 5 show a preferred embodiment of a stepladder according to the present invention. In the figure, a stepladder 10 is formed by fastening a locking member 30 to a lower end of each leg 21 of an aluminum alloy stepladder body 20 by bolts and nuts 40.

The stepladder main body 20 is constituted by pivotally supporting two pairs of legs 21... On a pivot shaft so that the legs can be opened in an inverted V-shape with each other. Are connected in a ladder shape. A chain 50 for opening is detachably attached to the ladder step of the opposing legs 21..., And the two pairs of opposing legs 21 open each other at a predetermined angle or more. Can be regulated.

A channel material having a C-shaped cross section is used for each of the four legs 21... To this end, a metal block 80 made of, for example, an aluminum alloy is inserted, and through holes 23 and 81 are formed in the metal block 80 and the leg 21.

At the lower end of the leg portion 21, a non-slip piece 22 made of rubber or synthetic resin used for a general stepladder is mounted. The structure of the lower end of the leg 21 is not the structure of a general stepladder as described above, but is a structure suitable for the present invention, that is, there is no anti-slip piece 22 and the lower end of the leg 21 is formed in an arc shape. It may have a structure.

On the other hand, the locking member 30 is a locking member having a U-shaped cross section measuring about 13.5 cm in width and about 5 cm in length, which is fitted into the upper half portion of the four-square-width horizontal member 70 from above. A pair of brackets 32, 32 having a substantially triangular shape protrude upward from the upper surface thereof at an interval at which the lower ends of the legs 21 are fitted in the direction in which the horizontal member 70 extends. It is formed.

Insertion holes 33, 33 are formed in the bracket portions 32, 32, and the insertion holes 33, 33 are formed with the insertion holes 23, 23, 81 formed in the lower end of the leg 21 and the metal block 80. The locking tool 30 is attached to the lower end of the leg 21 by being fitted and the bolt / nut 40 being inserted and tightened.

A retaining chain (floating member) 60 and a thumbscrew (floating member) 61 for preventing lifting are attached to the locking member 30. One end of the retaining chain 60 is connected to one of the lower bent sides of the anchor body 31, and a hook (not shown) is attached to the other end to cover the lower portions of the horizontal members 70 and 71. The stopper body 31 is detachably engaged with a hook hole 34 formed on the other of the lower bent sides of the stopper body 31.

On the other hand, the thumb screw 61 is screwed to one of the lower bent sides of the locking body 31 and is provided so as to be capable of screwing toward the other side. The horizontal member 71 can be pressed toward the other of the lower bent sides of the anchor body 31. In FIG. 4, reference numeral 35 denotes a screw hole into which the thumb screw 61 is screwed. The locking member 30 may be formed by bending an aluminum alloy-based or stainless steel-based metal plate, and is manufactured by die-casting or extrusion using an aluminum alloy-based material having a relatively small specific gravity and high bending strength. You can also.

When the stepladder 10 of the present example is used during the construction of a wooden house, the distance between the already installed adjacent horizontal members 70, 70 or 71, 71 is visually measured, and two pairs of the stepladder main body 20 opposing each other are visually measured. The legs 21 are separated from each other in an inverted V-shape so that the lower ends of the legs 21 are spaced from the adjacent horizontal members 70, 70 or 71, 71. After being installed on the horizontal members 70, 70 or 71, 71 from directly above and fitted from above, the two pairs of legs 21...

Then, the distance between the adjacent horizontal members 70, 70 or 71, 71 (generally set to about 1 m according to the standard) and the locking of the lower ends of the two pairs of legs 21. Since the intervals between the tools 30 are the same, for example, approximately 1 m apart from each other, the stepladder 1 is fixed to the adjacent horizontal member 70, 70 or 71, 71, but the two pairs of opposed The angle formed between the legs 21 is approximately 75 °, and the posture of the stepladder 10 is the most stable in the standard.

In the case of a four-sided rectangular cross member 70, the locking member main body 31 of the locking member 30 is fitted almost exactly to the upper half portion of the horizontal member 70, and the four locking member main bodies 31 is in contact with the horizontal member 70, the locking device 30 is securely fixed to the horizontal member 70, and the stepladder 10 is disengaged from the horizontal members 70, 70 unless the stepladder 10 is raised directly above. There is no.

On the other hand, in the case of the horizontal member 71 having a size of 3 × 5 mm, a gap of, for example, about 1.5 cm is formed between the horizontal member 71 and the lower bent side of the locking tool main body 31. Then, when the thumb screw 61 is screwed forward and the tip thereof is pressed against the other lower bent side of the locking member main body 31, the two surfaces of each of the four locking member main bodies 31 are moved sideways. The stopper 30 is firmly fixed to the horizontal member 71 when it comes into contact with the frame member 71 and is pressed by the thumbscrew 61. It does not come off from the members 71, 71.

When the retaining chain 60 is turned below the horizontal member 71 and its hook is locked in the hook hole on the other lower bent side of the locking tool body 31, the locking tool 30 is moved horizontally. It is possible to regulate the air floating from the frame 71.

In this state, when the worker gets on the stepladder 10, the weight of the worker in the direction in which the stoppers 30... And the horizontal members 70, 70 or 71, 71 are fitted to the stepladder 10. As a result, the self-standing stability of the stepladder 10 is further increased, and the stepladder 10 is firmly fixed to the horizontal members 70, 70 or 71, 71. After the work is completed, the stepladder 10 is directly above in the case of a 4-square cross member 70, and the thumbscrew 61 is loosened in the case of a 3-square 5 minute cross member 71. After removing, just pull it up directly.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a preferred embodiment of a stepladder according to the present invention installed on a horizontal member.

FIG. 2 is a perspective view showing a main part of the stepladder.

FIG. 3 is a view showing a fitting relationship between a horizontal member fixing bracket and a horizontal member in the stepladder.

FIG. 4 is a view showing a fixing structure of a locking tool and a leg in the stepladder.

FIG. 5 is a view showing an example of dimensions of a main body portion of the locking tool in the stepladder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stepladder 20 Stepladder main body 21 Leg part 23 Insertion hole 30 Locking tool 31 Locking tool main body 32 Bracket part 33 Insertion hole 40 Bolt / Nut (mounting fixture) 50 Opening stop chain (Opening stop member) 60 Floating stop chain (Floating stop) 61) Thumbscrews (floating member) 70 4-square horizontal member 71 3-square 5-minute horizontal member

Claims (9)

[Utility model registration claims] 1. A stepladder which is used by being installed on a horizontal member of a wooden house during construction of a wooden house, wherein the stepladder body pivotally supports a plurality of legs so that they can be opened mutually, and becomes independent. A lock is attached to the lower end of each of the plurality of legs, and the lock has a fitting shape portion that can be fitted or loosely fitted to the upper cross section of the horizontal member only from above. Then, the engaging member at the lower end of the leg portion of the stepladder body in the opened state is fitted or loosely fitted on the adjacent horizontal member at a predetermined interval, whereby the stepladder main body is placed on the horizontal member. A stepladder characterized by being fixed. 2. The stepladder main body is composed of two pairs of legs pivotally supported by a pivot shaft so as to be openable in an inverted V-shape, and the paired legs are connected to each other in a ladder shape. 2. The stepladder according to claim 1, wherein the stepladder main body is provided with an opening stopper member for restricting the leg opening to a predetermined angle or more. 3. The stepladder according to claim 1, wherein the locking member is provided with a retaining member for preventing floating from the horizontal member fitted or loosely fitted. 4. The locking member according to claim 3, wherein the retaining member is a screw member attached to one end of the locking member so as to be able to advance and retreat, and presses the horizontal member toward the other end of the locking member. Stepladder. 5. A chain member which covers the lower portion of the horizontal member and is detachably attached to the locking member.
The stepladder according to claim 3, which is a wire or a plate. 6. A self-standing structure in which a plurality of legs are pivotally supported by a pivot shaft so as to be mutually openable, and installed on a horizontal member of the wooden house during construction of the wooden house. A locking tool attached to a lower end of each leg of a stepladder to be used, wherein the locking tool body has a fitting shape capable of being fitted or loosely fitted from above only to a cross-sectional upper portion of the horizontal member. A pair of bracket portions are formed on the upper surface of the stopper body so as to protrude upward with an interval at which the lower ends of the leg portions are fitted in the direction in which the horizontal members extend, and the bracket portion has the plurality of bracket portions. An anchor for a stepladder, wherein an insertion hole is formed so as to be fitted with an insertion hole formed at a lower end of each leg and through which an attachment can be inserted. 7. The locking tool for a stepladder according to claim 6, further comprising a retaining member for preventing floating from the fitted or loosely fitted horizontal member. 8. The locking member according to claim 7, wherein the retaining member is a screw member attached to one end of the locking member so as to be able to advance and retreat, and presses the horizontal member toward the other end of the locking member. An anchor for stepladder. 9. The locking tool for a stepladder according to claim 7, wherein the retaining member is a chain, a wire, or a plate that covers a lower portion of the horizontal member and is attached to the locking tool.