JPH03436Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a safety net fixture provided directly below a manhole cover.

(Prior Art) As shown in FIG. 7, a safety net for a manhole is provided with a safety net hook 3 adjacent to a cover frame 2 of a manhole cover 1, and a safety net is connected to the safety net from an opening 3a of the hook 3. Insert the loop portion 5a of the attachment rope 5 of the safety net 4 into the safety net 4.
is designed to be attached to hook 3.

(Problem to be Solved by the Invention) However, the safety net 4 suspended from the hook 3 as shown in FIG. 5a and the hook 3 are disengaged,
There were times when I fell off hook 3. Therefore, in order to prevent this, as shown in FIG.
A protrusion 3b is provided to narrow the distance a, and prevents the attachment rope 5 of the safety net 4 from coming off (Utility Application No. 59-201099, (Utility Application No. 61-116848)
Publication No.), Utility Application No. 125646 (Sho 62-35048)
No. Publication)). However, in order to prevent the hook from coming off, the shape of the hook must be made that much more complex, and since the hook essentially has an opening, there is no guarantee that it will never come off. The present invention has been made in order to provide a safety net attachment that is almost impossible to dislodge due to the simple shape of the fastening device.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides an annular fitting that is fixed to a fixing part for installing a safety net, and a ring shape that does not have an opening. The safety net attachment rope is connected to the safety net using a carabiner-type annular body.

(Function) With this configuration, the spring of the carabiner-type annular body is pressed to create an opening in the annular body, and the opening is inserted into the ring of the annular fixture fixed to the fixed part. After that, if you stop pressing the spring, the carabiner-type annular body becomes annular and will not come off no matter what force is applied.

(Example) An example of the present invention will be described below with reference to the drawings. In FIG. 1, an annular fixture 20 fixed to a fixing part for attaching a safety net is attached to a concrete wall 2.
Install it on 1. Then, the attachment rope 11 of the safety net 10 and the annular attachment 20 are connected by a carabiner type annular body 12. As shown in FIG.
A pin joint 14a is provided at one end 14 of the cutout portion of the main body 13, and a rod-shaped body 15 is pivotally attached by the pin joint 14a.
The tip 16 of the rod-shaped body 15 forms an uneven surface 16a,
The other end 17 of the annular body 13 is also formed with a concavo-convex surface 17a that just fits with the concave-convex surface 16a of the tip 16 of the rod-shaped body 15. The rod-shaped body 15 is hollow and has a leaf spring 18 built therein, one end 18a of the leaf spring 18 is fixed near one end 14 of the notch of the annular body main body 13, and the other end 18b of the leaf spring 18 is hollow. The inner surface 15a of the rod-shaped body 15 is in contact with the inner surface 15a. As a result, the tip 16 of the rod-like body 15 comes into contact with the other end 17 of the annular body main body 13 from the inside under the force of the spring 18, and the uneven surfaces 16a, 17 of both
a is fitted, and the rod-shaped body 15 becomes 15' as shown by the imaginary line.
It is attached to the annular body main body 13 to form the annular body 12 as shown in FIG.

With such safety net fittings,
In order to attach the safety net 10 to the annular fixture 20 fixed to the concrete wall 21, in FIG.
When the part of the rod-shaped body 15 of the annular body 12 that is fitted into the annular body 12 is applied to the annular fixture 20, the rod-shaped body 15 bends the spring 18 and moves along the imaginary line in FIG. 1 (the solid line in FIG. 2). Moving to position 15', an opening is created in the annular body 12. As a result, the annular body 12 fits into the ring of the annular fixture 20, and the rod-shaped body 15 returns to its original state as shown by the solid line. FIG. 1 shows the situation.
If this happens, there will be a complete ring-to-ring connection, and a force will act on the rod-shaped body 15 from the inside to the outside, but
Since there is almost no possibility that the force pushing from outside to inside will work,
The rod-shaped body 15 is not bent inward to form an opening. Therefore, there is no possibility of an accident in which the safety net 10 comes off.

FIG. 3 shows another embodiment of the carabiner type annular body of the present invention. The main body 23 having a notch in a part of the annular body 22 has an annular shape with an acute angle at the tip, and the attachment rope 11 of the safety net 10 is fixed to that part, and the rod-shaped body 25 itself forms an elastic body. The annular body 23 rises from the acute angle part 24, and its tip 26 is connected to the other end 27 of the main body 23.
It abuts against the inner surface 27a from the inside with its own spring force.

By pressing the rod-shaped body acting as a spring, the fixed annular fitting 20 and the annular body 22 are connected,
The safety net 10 can be installed in the same manner as in FIG.

In the embodiments shown in FIGS. 2 and 3, the material of the annular body is not particularly limited. Thus, while the embodiment of FIG. 2 is easier to construct of metal, the embodiment of FIG. 3 can be constructed of either metal or plastic material. In addition, when it is made of plastic material, the shape of the rod-shaped body 25 in FIG. The shape can be arbitrarily determined as long as it is a part that contacts the other end of the main body from the inside and can maintain a space inside the annular body.

FIG. 4 shows a third embodiment, in which the boundary between the annular body 33 and the rod-shaped body 35 is not clear in the annular body 32, or the annular body 33 only serves as a fixing part, and the rod-shaped body 35 The tip 36 of the part flexes inward due to the elasticity of the rod-shaped body itself, as shown by the imaginary line 36', and the annular fitting of the fixed part is fitted in the same way as in the case of FIG. The point that it returns to its original shape is exactly the same as that shown in FIG. 2, and has the same effect.

In this example, the annular fixture of the fixing part is a semicircular one, but if it is an annular one without an opening, a full-circle annular body 30 as shown in FIG. 5 can be fixed to the concrete wall 21. Alternatively, as shown in FIG. 6, fixed objects 31 on both sides fixed to the concrete wall 21 may be tied together with a rod 32.

(Effects of the invention) Since the present invention has the above-mentioned structure and function, if the safety net is installed using this fixture, there is no risk of it coming off as would be the case when it is installed using a hook. . Therefore, there is no need to take various measures or concerns to prevent the safety net from coming off the hook, and the structure is simplified. Moreover, there is no absolute possibility that the safety net will come off, and safety is ensured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the safety net attached using the safety net attachment of the present invention; Fig. 2 is a plan view of the carabiner-type annular body; Figs. 3 and 4 are other embodiments. 5 and 6 are plan views of other embodiments of the fixed annular fixture, and FIG. 7 is a cross-sectional view of the manhole cover showing the state in which a conventional safety net is attached. FIG. 8 is a side view of a conventional safety net hook. 20... Annular fitting, 10... Safety net, 11... Safety net attachment rope, 12...
...Carabiner type ring body.

Claims (1)

[Scope of utility model registration request] The attachment that is fixed to the fixing part for attaching the safety net is annular with no opening, and the annular attachment and the attachment rope of the safety net are connected by a carabiner-type annular body. Safety net attachment.