JP3424820B2 - Manhole safety net fixture - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety net for a manhole for locking four corners of a safety net stretched over a manhole entrance to a circumference of a manhole cover frame. It is about a fixture. 2. Description of the Related Art As shown in Japanese Utility Model Publication No. 3-436, for example, this type of conventional manhole safety net mounting device is a mounting device that is fixed to a fixing portion for mounting a safety net. There is an annular type having no opening, wherein the annular mounting member and a mounting net of a safety net are connected by a carabiner type annular body. [0003] Incidentally, in the known device, since the circumference of the annular body is large, the mounting net of the safety net moves on the circumference of the annular body, so that the safety net is reliably formed. There is a fear that the tension cannot be stably installed. Further, since the closing member for closing the hook of the annular body is engaged with the hook, the closing member can be opened and closed only in one direction, and the opening and closing of the closing member may not be easy. [0004] The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a safety net that can be securely and easily stably extended and removed. It is an object of the present invention to provide a safe manhole safety net attachment which can be easily checked from the upper surface side of a manhole whether or not the manhole is correctly stretched. [0005] In order to achieve the above object, a fixture for a manhole safety net according to the present invention has a net holding ring formed at one end thereof to penetrate the safety net. On the other end side, a hook portion to be engaged with a rib provided on the manhole cover frame is formed, and a synthetic resin attachment body having a body portion formed between the ring and the hook portion, and toward a tip portion of the hook portion. A hook closing member that forms a tongue protruding from the trunk and is integrally formed with the attachment main body, the tip of the tongue being close to the curved surface of the tip of the hook, And a reflector. 1 to 4 relate to an embodiment of the present invention. FIG. 1 is a side view of a manhole in which a safety net is stretched by a manhole safety net attachment according to the present invention. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of the fixture, and FIG. 4 is a side view of the fixture. In the figure, reference numeral 1 denotes a manhole, the upper part of which is composed of a sloping wall concrete frame 2 provided with an inclined portion and a manhole cover frame 4 on which a manhole cover 3 is installed. A manhole safety net 5 is stretched around the inner periphery of the manhole cover frame 4. [0008] The manhole safety net 5 comprises:
The four corners of the safety net 5 are locked to the ribs 7, 7,... Formed at, for example, four places on the circumference of the manhole cover frame 4 by attachments 6, 6,. Thus, the net 5 is stretched. The attachment 6 is integrally formed with an attachment body 8 made of a synthetic resin and a hook closing member 9. The attachment main body 8 has a net holding ring 10 formed at one end thereof to penetrate the net of the safety net 5, and a hook portion at the other end which is engaged with a rib 7 formed on the manhole cover frame 4. 11 is formed, and the body 1 is located between the ring 10 and the hook 11.
2 are formed. A reflector 13 is disposed on the front and back surfaces of the body 12. The hook closing member 9 is a tongue piece 14 projecting from the body 12 toward the tip of the hook 11.
The tip 15 of the tongue piece 14 comes into contact with the curved surface 16 at the tip of the hook 11. In the manhole safety net fixture 6 having the above-described configuration, the four corners of the net 5 are attached to the ring 1 of the fixture 6 when the safety net 5 is formed.
.. Are arranged on the net 5 so as to penetrate the net 5. Then, in order to lock each fixture 6 to each rib 7 formed on the manhole cover frame 4, the tongue piece 14, which is the hook closing member 9, is hooked in one of the right and left directions by a finger. Is opened, the rib 7 is inserted into the hook 11, and the finger is released from the tongue piece 14, the tongue piece 14 is closed, and each mounting fixture 6 is closed.
Is locked to each rib 7. At this time, since the fixture body 8 and the hook closing member 9 are made of synthetic resin, they have elasticity and can be locked easily and securely. Therefore, it is necessary to provide the hook closing member 9 with an elastic member such as a spring. A simple and inexpensive hook closing member 9 may be used. When each fixture 6 is engaged with each rib 7, each reflector 13 arranged on the front and back surfaces of the body 12 of the fixture main body 8 is accurately positioned on the upper and lower surfaces. By locking the ribs 6 to the respective ribs 7, the safety net 5 is securely stretched, and it can be easily confirmed from the upper surface side of the manhole 1 whether the net 5 has been stretched accurately. By arranging the safety net reflectors 17, 17,... Near the four corners of the net 5, it is possible to easily check whether the net 5 has been stretched more accurately and to know the position of the net 5 and the like. Can be. According to the fixture for a safety net for a manhole according to the present invention, a net holding ring for penetrating the net of the safety net is formed at one end and provided on the manhole cover frame at the other end. Hooks to be hooked to the ribs
An attachment body made of synthetic resin having a body formed between the ring and the hook, and a tongue piece protruding from the body toward the tip of the hook and integrally formed with the attachment body; The hook is made up of a hook closing member in which the tip of the tongue piece is brought close to the curved surface of the tip of the hook, and a reflector disposed on the body, so that the safety net is reliably, easily and stably. It is a fixture for a safe manhole safety net that can be stretched and removed and that can be easily checked from the top side of the manhole whether it has been stretched correctly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a manhole in which a safety net is stretched by a manhole safety net attachment according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a front view of an attachment. FIG. 4 is a side view of the attachment. DESCRIPTION OF SYMBOLS 1 Manhole 4 Manhole cover frame 5 Safety net 6 Manhole safety net attachment 7 Rib 8 Attachment body 9 Hook closing member 10 Net holding ring 11 Hook portion 12 Body portion 13 Reflector 14 Tongue piece 15 Tip 16 of tongue piece Curved surface of tip of hook

Claims (1)

(57) [Claims 1] A manhole safety net attachment for locking four corners of a safety net stretched at a manhole entrance to a circumference of a manhole cover frame. Formed a net holding ring to penetrate the net of the safety net, formed a hook on the other end side to be hooked on a rib provided on the manhole cover frame, and formed a trunk between the ring and the hook A tongue piece protruding from the body toward the tip of the hook, and integrally formed with the attachment body, and the tip of the tongue is a curved surface of the tip of the hook. And a reflector disposed on the trunk portion. A fixture for a safety net for manholes, comprising: