JPH0316991Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chain used for hanging scaffolding used at building construction sites, etc.

[Prior Art] As shown in FIG. 4, a chain 10 used for a suspended scaffold, etc., has hooks 3 attached to both ends of a chain 2 formed by connecting a number of rings 1. It was used by hooking a predetermined ring 1A of the chain 2 through a certain notch 4 to form a ring, and it could be easily hooked and removed. The chain 10 used for this hanging scaffolding etc. is used as a tool to support the scaffolding of workers at construction sites etc.
Usually, as shown in FIG. 5, a chain 10 is hung on a steel beam 30 under construction, and a log 50 is hung horizontally below a plurality of chains 10 hung in this way.
Furthermore, a scaffold board 40 is constructed between the plurality of logs 50 in this state, and is tightened with a wire 60 for use.

[Problems to be solved by the invention] The chain 10 used for this hanging scaffolding, etc. usually has the weight of a person on the hook 3 and the chain 2, or the scaffold board 4.
The weight of objects such as 0 and log 50 exerts downward force, creating tension. However, since the notch 4 of the conventional hook has a straight line between the entrance and the deepest part and there is no catch, when an external force is applied to one end of the scaffolding board 40, such as when a person jumps, the scaffolding board On the other side, the reaction force F is chain 1
There were cases in which the zero tension acted instantaneously in the direction of loosening, and as a result, the predetermined ring 1A hooked on the notch 4 of the hook 3 came off. As a result, the chain 2 came off the hook 3 and the scaffolding collapsed, causing the person working there to fall and sustain injury, or even to endanger his or her life.

The purpose of the present invention is to provide a chain for use in hanging scaffolding, etc., which can prevent the chain 2 from easily coming off the hook 3 even if an external force is applied to the chain 10 in the direction of loosening the tension, and can improve safety.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a chain in which a number of rings made of rigid bodies such as metal or plastic are connected together, a hole in a plate-shaped metal piece through which the rings are inserted, and the chain. and a hook rotatably connected to the ring at the end of the chain, the hook having a notch into which a predetermined ring of the chain enters, and a hook rotatably connected to the ring at the end of the chain,
In a chain used for a hanging scaffold, etc., in which a predetermined ring of the chain is hooked into a notch in the hook to form a ring, when the predetermined ring is hooked into a notch in the hook, the chain is inserted into the ring. A structure is adopted in which a return portion is provided on the incision side of the portion where the ring is removed to prevent the ring from being removed.

[Function] With the above-described structure, when a predetermined ring hooked on the notch of the hook tries to come off from the notch of the hook due to reaction, the ring is locked to the return part of the notch and is prevented from coming off. Ru.

[Example] An example of the present invention will be described based on FIGS. 1 to 3.

Reference numeral 10 indicates a chain used for a suspended scaffold, etc. of the present invention, which includes a chain 2 and a chain 2 rotatably connected to both ends of the chain.
It consists of three hooks. One hook 3 may be connected to only one side of the chain 2. Chain 2 is
It is made by cutting an iron bar to a certain length, bending it into an oval shape, and welding both ends to form a ring 1, which is then connected together to form a large number of rings. The hook 3 is a plate-shaped metal piece manufactured by punching an iron plate into an oblong shape, and has a hole 31 into which the ring is inserted.
A notch 4 for hooking a predetermined ring of the chain 2 is provided. Note that the ring 1 and the hook 3 may be made of plastic. When the predetermined ring 1A is hooked onto the hook 3, the notch 4 is a tension application point 6 which is the connecting part between the hook 3 and the chain 2, and the joint part between the predetermined ring 1A and the notch. On the straight line connecting the tension application point 7
A bent portion 5 is provided which is concavely bent downward beyond _l1 .

When a force in the direction of loosening the tension is applied to the chain 10 in use, or when the hook 3 is tilted due to vibration, etc., the return portion 5 is activated by the force F on the predetermined ring 1A hooked on the notch 4. When the wheel 1A is lifted upward in the drawing by the action of
Once it is hooked on, it is locked and prevented from coming off.

FIG. 3 is a diagram showing the state in which the present invention is used at a construction site or the like.

A plurality of chains 10 used for hanging scaffolds according to the present invention are attached in a ring shape to each beam 30 installed horizontally between the pillars 11. A log 50 is attached to each beam 30 in an annular chain 10 parallel to the beam 30.
give. A board 4 that will serve as a foothold between these 50 logs
0, and the log 50 and the scaffold board 40 are fastened together with wire to construct a scaffold for the worker.

The annular chain 10 is normally under tension due to the downward force of the human weight and the gravity of the scaffolding board 40 and the log 50, so the ring 1A and the hook 3 do not come off. However, when the worker jumps off one end of the board and an upward force is generated on the other end of the board as a reaction, the chain 2 recoils upward, causing the chain 1A hooked to the notch 4 to moves from the deepest part of the notch toward the cut end of the notch. In this case, the ring 1A is locked to the return portion 5 provided in the notch 4 of the hook 3 to prevent it from coming off.

Moreover, this notch 4 can be formed at the same time as the hook using a press, or the notch 4 of the hook can be
When removing the ring 1A from the ring, by pressing the ring 1A against the outer edge 4A of the cut ring, the turned part 5 can be removed smoothly without becoming an obstacle to removal. There is no difference compared to the conventional product.

[Effects of the invention] As mentioned above, in the present invention, the chain 2 is less likely to come off than the hook 3, which improves work safety and reliability, and also improves work efficiency by allowing the worker to concentrate on the work. .

Moreover, the manufacturing cost and ease of attachment and detachment are almost unchanged compared to conventional ones.

[Brief explanation of the drawing]

Figure 1 is a front view showing the chain used in the suspended scaffolding of the present invention, Figure 2 is a front view of the chain used in the suspended scaffolding of the present invention in a ring shape, and Figure 3 is the front view of the chain used in the suspended scaffolding of the present invention. FIG. 4 is a front view of a chain used in a conventional suspended scaffolding, etc., and FIG. 5 is a diagram of a chain used in a conventional suspended scaffolding. In the diagram, 1...ring, 2...chain, 3...hook, 4
...notch, 5...turning part, 31...hole.

Claims (1)

[Claims for Utility Model Registration] A chain that connects a number of rings, a plate-like piece having a hole through which the rings are inserted and a notch into which a predetermined ring of the chain is inserted, and a ring at the end of the chain that rotates. A chain used for hanging scaffolding, etc., consisting of freely connected hooks, in which a predetermined ring of the chain is hooked into a cut in the hook to form a ring, the predetermined ring is pulled into a cut in the hook. 1. A chain for use in a hanging scaffold, etc., characterized in that a chain for use in a hanging scaffold or the like is provided on the notch side of a portion inserted into the ring when the chain is hung to prevent the ring from coming off.