JPH06105022B2 - Lifting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lifting tool capable of enhancing the stability of a scaffold and improving the work efficiency at high places and the work safety.

[Conventional technology]

For example, when performing work at a high place or climbing up and down to a high place, a lifting tool such as a stepladder using a ladder-shaped base body in which a pair of long side frame members are connected by a tread is usually used.

[Problems to be Solved by the Invention]

However, conventionally, in stepladders and the like, although the side frame members are connected in a C-shape in which the lower ends are wider than the upper ends, the spacing between the lower ends is insufficient and the scaffolding Lack of stability, especially when stepping up and down, lateral movement of the center of gravity due to an unpleasant work posture, etc., may cause swaying, tilting, etc., greatly reducing work efficiency at high places, and sometimes causing rollover accidents. It was inferior in safety such as provoking.

Increasing the distance between the lower ends of the side frame members causes an increase in storage space, makes it inconvenient to handle, and makes it difficult to work in the corner area. Since it is supported at two positions on the lower end of the side frame member, it is difficult to prevent a large balance decrease such as an inclination that occurs when one lower end of the side frame member is arranged on a soft installation surface.

The present invention is based on the fact that the upper end of the tool whose lower end abuts on the installation surface at a position distant outward from the side frame member is rotatably supported by the side frame member so as to increase the storage space. It is an object of the present invention to provide a lifting tool that can greatly improve the stability of the scaffold without inviting it and can solve the above problems.

[Means for Solving the Problems]

In order to solve the above problems, the lifting tool of the present invention is framed by a pair of side frame members whose lower end is placed on the installation surface, and a tread plate that connects the facing inner surfaces of the side frame members and is arranged in multiple stages. The ladder-shaped base body and the side frame member of the base body are rotatably supported at their upper ends and at the position where the lower end is outwardly separated from the side frame member in the direction opposite to the step plate by the leaching. The auxiliary tool has an arm-shaped member that abuts on the installation surface, and further includes a holding piece that holds the member at the popping-out position, and the member is formed by bending a rod-shaped body into a U-shape. A bent body that forms a space inside and has both ends axially supported by both side surfaces of the side frame member is used, and the space length is set to be larger than a lower length from the axial support point to the lower end of the side frame member. By doing so, the side frame member can Thereby enabling housed in bouncing insertion position of the step board lower bottom through lengths.

[Action]

By pushing out, the installation width can be expanded by the fixture whose lower end abuts the installation surface at a position distant from the side frame material, and the scaffolding can be expanded at the lower end of each side frame material and the four points of the fixture. Can be supported by. Therefore, it is possible to prevent lateral movement of the center of gravity during hoisting or working at heights and lateral swaying, tilting, or overturning due to the placement on a weak installation surface, which can improve work efficiency and greatly improve safety. sell.

In addition, this tool is a U-shaped bent body with a space formed inside,
Also, by allowing the tool to be stored in the jumping-in position below the lowermost step plate through the lower length part of the side frame member from the jumping position to the space, when the tool is not used, the corresponding tool is attached to the side frame member. Since it can be stored under the tread without positioning it outside, this tool can be prevented from interfering with this storage, and for example, work in a corner area can be performed conveniently and storage and storage in a small space is possible. It is possible.

Moreover, since the upper end of the tool is axially supported by the side frame member, the load acting on the tool can be mainly borne by the axial force of the tool, that is, the axial force, and the bending stress of the tool is reduced. It is possible to prevent breakage, further improve safety, and increase support strength.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, the lifting / lowering tool 1 according to the present invention includes a pair of side frame members 2, 2
It is provided with a base body 5 in which treads 3 are laid in multiple stages and an auxiliary cane member 6 attached to the base body 5, and in this example, the lifting tool 1 is
By pivotally connecting the upper ends of the pair of bases 5A and 5B to each other, the bases 5A and 5B are formed as a V-shaped stepladder that is connected to each other in a bendable manner, and one base 5A on the lifting side is assisted. The cane members 6 and 6 are provided. In the specification, the direction in which the bases 5A and 5B are arranged so as to be inclined in a V-shape is defined as the rearward direction and the opposite direction is defined as the frontward direction.

The base 5A is a pair of long side frame members 2 and 2 which are arranged with the inverted V-shaped inclination and whose lower end 9 is placed on the installation surface S.
And a stepped plate 3A framed by a plurality of step plates 3 ... Which are horizontally and differently laid between the facing inner surfaces of the side frame members 2 and 2 at different heights. In this example, the step plate 3A located at the uppermost step is formed. Is shorter than the footboard 3B located at the lowermost stage, the side frame members 2, 2 are connected to each other in a wider width between their lower ends than their upper ends. The lower end 9 has rubber feet 8 for slip prevention.
Is fitted.

As shown in FIG. 2, the side frame member 2 has a grooved steel shape with a lip protruding from the side edge of a base portion 10 having a U-shaped cross section by projecting the lip portion 11 toward the inside. The groove 12 provided is provided with a notch 13 for fixing the tread 3 formed by notching the lip 11.

The tread plate 3 has a rectangular tubular shape whose upper surface is horizontal in the above-mentioned C-shaped inclination gradient, and one end fitted into the notch 13 has a side piece 2A on the rear side of the side frame member 2 and a side on the front side. Piece 2B
It is screwed by a bolt that penetrates. In addition, tread 3
The bases 5A and 5B are developed in a straight line so that the lower surface facing upward becomes horizontal. In this example, the lower surface is inclined rearward and downward and has a substantially trapezoidal cross section. The lower surface is covered with a non-slip material 15 made of a rubber material or the like. The side frame member 2 and the tread plate 3
Is preferably made of a drawing material made of an aluminum-based lightweight alloy.

Further, the base 5A is provided with a substantially wide top plate 16 on the upper surface of the uppermost step plate 3A that is aligned with the upper ends of the side frame members 2 to increase the foot area, and at the bottom of the lower step plate 3B. The tread
A stay 17 that connects the 3B and the side frame member 2 is arranged.

As shown in FIG. 3, the stay 17 has mounting portions 17B formed by pressing and flattening the base pipe 17A at both ends of a circular tubular base pipe 17A, and the mounting portion 17B and the lower piece 3B1 and side of the tread 3B. The base 5A is reinforced in a triangular truss shape by bolting the outer piece 2C of the frame member 2.

The base 5B has the same structure as the base 5A, and the base 5A,
The overlapping portions of the side plates 20, 20 that are attached to the upper ends of the 5B and the outer surface of the side frame member 2 and extend in the rearward direction.
By pivotally attaching 20A, the base bodies 5A and 5B can be freely bent between the straight expanded state and the parallel folded state, and each of the base bodies 5A and 5B has an arm-like shape that joins them. It is held in the above-mentioned V-shape by the joint material 21.

In this example, the splice material 21 is the upper splice material piece 21A and the lower splice material piece 2A.
As shown in FIG. 4, the joining material piece 21A including 1B has one end pivotally supported on the outer surface of the side frame member 2 of one base 5A and the other end of the substrate 22 extending in the rearward direction. On the other base 5B
The lower open fitting groove 25 that can be fitted to the pin piece 23 protruding on the outer surface of the side frame member 2 is provided. Further, the upper joint material piece 21A is provided with a stopper metal fitting 26 for preventing the fitting and disengagement from the pinan piece 23 on the board 22, and the stopper metal fitting 26 is pivotally attached to the board 22 and has the fitting groove 25. And a spring piece 26B disposed at the pivot point and biasing the metal piece 26A upward.

Further, the lower joint material piece 21B has the same structure as the upper joint material piece 21A, and in this example, a pin piece 27 for projecting the other end of the substrate 22 pivotally attached to the other base body 5B to the one base body 5A. Is fitted to.

In the lifting tool 1 of the present invention, as described above, the one base body 5A on the lifting side, in which the center of gravity of the worker moves remarkably.
The auxiliary cane members 6, 6 are attached to the.

As shown in FIG. 5, the auxiliary cane member 6 has a support metal member 30 fixed to the side frame member 2 and an arm-like member whose upper end is axially supported by the support metal member 30 so as to be capable of springing outward. It has a fixture 7.

The support metal fitting 30 has side pieces 31B, 31B along the rear side piece 2A of the side frame material 2 and the side piece 2B of the front side side, which are formed on both side edges of the base piece 31A along the outer piece 2C of the side frame material 2. Bent section U-shaped section 31
The support fitting 30 is fixed by surrounding the side frame member 2 from the outside with a bolt 33 penetrating the side piece 31B and screwed to the side frame member 2. The support fitting 30 pivotally supports the tool 7 by means of a support shaft 35 protruding from each side piece 31B.

At the bouncing position Y1, the upper end of the tool 7 is the support shaft 35.
At the lower end of the pivotal support portion 39 that is pivotally supported and extends downward, a slope portion 40 that extends outward from the side frame member 2 in the direction opposite to the footboard 3 and extends downward toward the installation surface S is provided. An installation portion that includes a pair of extending doglegs 41 and 41 having a substantially V shape, and that can come into contact with the installation surface S at a position apart from the side frame member 2 between the lower ends of the cane pieces 41 and 41. The piece 42 is bridged. In this way, the upper end of the tool 7 of the auxiliary cane member 6 is pivotally supported by the side frame member 2 via the support fitting 30. The tool 7 is composed of a bent body in which a space P is formed inside a U-shaped hollow pipe body which is a rod-shaped body, and the pivotal support portions 39, 39 forming both ends thereof are flattened by pressing the pipe body. The side frame member 2 is axially supported by the support metal fittings 30 as described above on both side surfaces of the side pieces 2A and 2B on the rearward and frontward sides. Further, the fitting 7 is covered with a rubber-like non-slip material 43 around the installation piece 42, and the length of the space P of the fitting 7, that is, the length of the slanted portion 40 is set to the supporting shaft. The lower length portion LA of the side frame member 2 can be passed through the space P by making it larger than the lower length L from the axial fulcrum where 35 is arranged to the lower end 9 of the side frame member 2. In addition, in this example, in order to avoid the collision between the rubber foot 8 and the tool 7, the cane piece 41 on the rearward side is provided with the bent portion 41B.
Is provided.

Then, the hitting tool 7 is a projecting projection formed on the side piece 31B of the support fitting 30 and is formed of a holding piece 45 which is formed along the outer edge of the pivotal support 39 and has its lower end abutted against the slope 40 at the projecting position Y1. By the stopper means 47, the bounce position
While being held at Y1, the tool 7 is tilted inward about the support shaft 35 through the lower length portion LA of the side frame member 2 from the popping position Y1 to the space P to move the cane piece 41 to the inward direction. Installation piece
The tool 42 can be stowed up to the hoisting position Y2 in which 42 is arranged below the lowermost step plate 3B, and the tool 7 is stored thereby.

The hitting tool 7 is preferably urged in the direction of flipping by an appropriate spring means such as a coil spring or a hook spring, and the hitting tool 7 is, as shown in FIG.
It is detachably held at the bounce-in position Y2 by a bounce-in stopper means 48 which is attached to the lower surface of 3B and is composed of, for example, a leaf spring-like stopper piece 46.

In this way, in the lifting tool 1, the installation width of the base body 5A on the lifting side can be expanded by popping out the support member 7 of the auxiliary cane member 6, and moreover, the number of installations in contact with the installation surface S can be set to the side frame members. Two
Since it can be increased to 4 points of the lower ends 9 and 9 and the fixtures 7 and 7,
The stability of the scaffold can be greatly increased. Therefore, it is possible to prevent the balance from deteriorating due to the lateral movement of the center of gravity at the time of lifting and lowering and working and the arrangement on the weak installation surface, so that the working efficiency on the lifting tool 1 can be improved and the safety can be improved. .

〔The invention's effect〕

As described above, since the lifting / lowering tool of the present invention uses the tool that abuts against the installation surface at a position distant outward from the side frame member by bouncing out, the installation width can be expanded and each side can be expanded. It can be supported at the bottom of the frame and at four points on the tool, greatly improving the stability of the scaffold. The tool is composed of a bent body in which a space is formed in the U-shape of a rod-shaped body, and both ends thereof are pivotally supported by both side surfaces of the side frame member, and the space length is from the pivot point to the side frame. Do not use the tool because it is larger than the lower length to the lower end of the material and can be stored in the space of the space below the bottom tread plate through the lower length part of the side frame material from the popping position to the space. Sometimes the corresponding tool can be stored at the bounce-in position without storing it outside the side frame material, and for example, the stored tool can be prevented from getting in the way when working in a corner area, etc., and the usability can be improved, Lifting equipment can be stored and stored in a small space.

Further, since the upper end of the tool is axially supported by the side frame member, the load acting on the tool can be mainly borne by the axial force of the tool extending from the fulcrum, that is, the axial force, and the support strength can be increased. At the same time, the bending stress applied to the tool can be greatly reduced as compared with, for example, the bending stress acting on the auxiliary member protruding in the substantially horizontal direction, the damage can be prevented, and the safety can be improved. Moreover, since this tool is bounced and bounced by the rotation at the shaft fulcrum, it can be bounced out and bounced in smoothly as compared with the slide type which tends to rattle due to manufacturing errors. It can improve usability and quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a mounting state of a tread, FIG. 3 is a sectional view showing a mounting state of a stay, and FIG. FIG. 5 is an enlarged perspective view showing a combined state, FIG. 5 is an enlarged perspective view showing an auxiliary cane member, and FIG. 6 is a sectional view showing a stopper piece. 2 ... Side frame material, 3, 3A, 3B ... Footboard, 5, 5A, 5B ... Base body, 6 ... Auxiliary cane member, 7 ... Support, 9 ... Lower end, 45 ... Holding piece, L ...... Lower length, LA ・ ・ ・ Lower length part, P ・ ・ ・ Space formed in the tool, S ・ ・ ・
… Grounding surface, Y1 …… Bounce position, Y2 …… Bounce position.

Claims (1)

[Claims] 1. A pair of side frame members whose lower ends are placed on an installation surface,
A ladder-shaped base body that is framed by the step plates that connect the facing inner surfaces of the side frame members and that are arranged in multiple stages, and the upper end is pivotally supported by the side frame members of the base body so that the lower end It has an arm-like member that abuts against the installation surface at a position outwardly away from the side frame member in the direction opposite to the footboard, and further includes a holding piece that holds the member at the protruding position. In addition to the auxiliary cane member, the tool uses a bent body in which a rod-shaped body is bent into a U shape to form a space inside and both ends are axially supported by both side surfaces of the side frame member. By making the length larger than the lower length from the shaft fulcrum to the lower end of the side frame member, the lower length of the tread plate below the bottom plate through the lower length portion of the side frame member into the space from the popping position. Lifting tool that can be stored in the bounce position.