JPH0223322Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improvement to a safety hook attached to the rope of a safety belt used by workers at heights to prevent falls.

In the past, this type of hook was used for the purpose of connecting the worker's body to a structure by attaching it to the end of a rope and simply hooking it onto a ring, step bolt, or other engaging object. However, due to psychological errors such as illusions or forgetfulness on the part of the workers, these hooks could not be completely engaged with the structure, resulting in a fall accident. In order to prevent these psychological mistakes by workers, a device has been developed that sounds an alarm to notify the worker when the hook is not completely engaged with the target object, that is, when the hook is in a defenseless state. It is an object of the present invention to provide a safety hook for use with these alarm devices.

Aspects of the present invention will now be described in detail with reference to an embodiment illustrated in the accompanying drawings.

As shown in the figure, in this embodiment, a hook body 3 is provided with a hook 1 at its distal end and a rope connecting member 2 rotatably provided at its base end, and a hook 4 is always biased in the direction of closing on the abdominal side of the hook body 3. An opening/closing cap 5 provided with a spring is provided, and a groove-like portion 6 extending in the length direction is provided at the center of the thickness of the plate-like body forming the hook body at the abdominal side edge of the hook body 3, and a rope connection is provided. Part 2
A through hole 8 is provided along the axis of the connecting shaft 7 to which the
a recess is provided at the end of the connecting shaft 7, into which an insulator 18 made of rubber or synthetic resin is fitted or flowed,
A fixed terminal 9 made of a conductive material such as copper or brass is provided in the center of the insulator 18, and a micro switch 22 is provided as an electronic component in the abdomen of the hook body 3.
One end of the two electric wires 10 extending from the electrodes of the microswitch 22 is electrically connected to the hook body 3 by soldering or the like, and the other electric wire 10 is inserted from the groove-shaped portion 6 into the through hole 8. The end of the conductor 17 is electrically connected to the fixed terminal 9, and the rotary terminal 11 is protruded from the center of the outside of the bottom of the conductor 17, which is made of a thin plate of copper or brass bent into an approximate L-shape. shaft hole 19
are provided, and the rotary terminal 11 and the electrode 1 of the thimble 12 are connected to each other.
The conductor 17 is coated and insulated with a synthetic resin 21 except for the circular electrode contact portion 20 that contacts the conductor 17.
along the inside of the U rod 16 constituting the rope coupling member 2, and its rotating terminal 11 connects to the fixed terminal 9.
Electrodes 14 are provided at both ends of a thimble 12 made of synthetic resin and formed into an approximate roller shape so as to slightly protrude outward. The connected thimble 12 is fitted inside the U rod 16 so that the electrode 14 on one side is brought into contact with the electrode contact portion 20 of the conductor 17, and the electrode 14 on the other side is brought into contact with the U rod 16. Attached by a shaft 13, the thimble 12
A lead wire 23 is connected to each electrode 14, 14, respectively.

A lever 15 is rotatably provided on the hook body 3, the tip of which projects into the hook mouth 4 between the side wall 51 of the opening/closing cap 5 and the hook body 3 to sense the size of the engaging object 31. The contact of the micro switch 22 of the electronic component is opened and closed by the rotation of the lever 15, and the lever 15 is provided with a spring 33 which always urges it in the direction of contacting the engaging object 31.

Note that the rotary terminal 11 does not necessarily need to be provided in a protruding manner, and the conductor 17 itself may be used as the rotary terminal 11 as long as the fixed terminal 9 is protruded.

Further, the reference numeral 24 in the figure is a shaft for stopping the rotation of the thimble 12, and the reference numeral 25 is a safety cap.

The hooks shown in FIGS. 3 and 8 show other embodiments of the present invention, in which the connecting shaft 7 that rotatably connects the hook body 3 and the rope connecting member 2 is made independent. , one end thereof is bifurcated to sandwich the base end of the hook body 3 and fixed with a rivet 26 to form an integral body with the hook body 3, and a battery 2 is attached to one side wall 51 of the opening/closing cap 5.
7, a buzzer 28, a micro switch 22, and a box 34 containing an electric circuit incorporating electronic components such as transistors, and electrically connecting each electrode of the electronic circuit to the electric wire 10, and connecting the open/close cap 5. The contact point of the micro switch 22 of the electronic circuit is operated by the proximal protruding piece 32 of the lever 15 which detects the engaging object rotatably attached to the opening/closing cap 5 between the side wall 51 and the hook body 3. A plurality of fixed terminals 9 and rotary terminals 11 are provided so that they are in corresponding contact with each other,
The first embodiment is characterized in that the two rotating terminals 11, 11 and the electrodes 14, 14 provided on both sides of the thimble 12 are electrically connected by conductors 17, 17 provided along both inner sides of the U rod 16, respectively. Although it is different from the example, other functions and effects are the same.

In this second embodiment, if the electrode has two contacts due to the electronic circuit, the above structure may be used, but if three contacts are required, the ground electrode is connected to the hook body 3 and rope connected as in the first embodiment. An electrical connection is made to the thimble 12 through the U-rod 16 and shaft 13 of the member 2, and a ground wire from the thimble 12 is connected to the wire in the rope. In this case, it is necessary to use a conductor such as aluminum or copper for the whole or a part of the thimble 12 to bring it into contact with the shaft 13.

Furthermore, in order to improve the contact between the fixed terminal 9 and the rotary terminal 11, it is possible to provide either or both of them with a spring that biases them in the direction of contact.

To use the present invention, as shown in FIG. 6, the hooks of the present invention are attached to both ends of a rope 29 made of synthetic fibers twisted together and having an electric wire 23 passed through the center of each strand. For example, the hook of the first embodiment is attached to one end of the rope 29, the hook of the second embodiment is attached to the other end, and the electric wire 23 passed through the rope is attached to the electrode 14 of the thimble 12 of each hook. Connect the required number of electrodes to each. In this case, depending on the configuration of the electronic circuit, there are cases in which the two hooks are electrically connected by three electric wires, and cases in which the two hooks are electrically connected by two electric wires. In this explanation, a case will be explained in which the simplest circuit shown in FIG. 7 is provided. That is, the main hook A of the first embodiment (Fig. 1) has only the micro switch 22 (SW1) built-in, and the auxiliary hook B of the second embodiment (Fig. 3) has a battery 27, a micro switch 22, and a buzzer. It is assumed that electronic components such as 28 are built in and electrically connected by two electric wires 23 between the two.

The worker working at height connects the telescopic adjuster 30 inserted through the middle of the rope 29 to the square ring of a safety belt (not shown) worn on the body, and after passing the main hook A around a telephone pole etc., attaches it to the D ring of the safety belt. Work at heights is carried out with the auxiliary hook connected to the step bolt of a utility pole, etc., but as mentioned above, make sure that both or one of main hook A and auxiliary hook B is properly engaged with the target object. When the 7th
Since both or one of SW1 and SW2 of the electronic circuit shown in the figure is in an open state, no current flows through the electronic circuit, so the buzzer 28 does not sound. Book hook A
When both the and the auxiliary hook B are not engaged with anything or are not engaged with the determined object normally, both switches (SW1) (SW2) are short-circuited, and current flows and the buzzer sounds. 28 will sound and an alarm will be sounded to notify the worker of a dangerous situation.
Devices and structures that emit an alarm sound when the hooks attached to both ends of the rope come off the hanging object have already been developed, so the present invention relates to the hooks used for these things. Its purpose is to detect an object, operate a switch accurately, and accurately connect the switch action electrically to an alarm device.

In the first embodiment of the present invention (FIG. 1), the hook opening 4 is made small in order to hook onto a relatively thin object such as a ring of a safety belt, and the hooking object 31 fits inside the hook opening 4. lever 1 to determine whether or not there is a
5 senses the rotation angle of the lever 15, and operates the contact point of the micro switch 22 on and off. In addition, in the second embodiment shown in FIG. 3, the hook opening 4 is enlarged to fit a relatively thick engagement object 31 such as a rope or a step bolt, and as in the first embodiment, there is no engagement object 31. Its size is sensed at the tip of the lever 15, and the contact point of the micro switch 22 in the electronic circuit is operated by the proximal protruding piece 32 of the lever. The lever 15 in both embodiments rotates independently regardless of the rotation of the opening/closing cap 5, but when the opening/closing cap 5 is rotated, the lever 15 rotates together with the rotation of the opening/closing cap 5.

The present invention is constructed as described above, and the lever 15 that senses the engaging object 31 is connected to the opening/closing cap 5 whose original purpose is to hold the engaging object 31 engaged in the hook opening 4 so that it does not come off. Since the hook rotates separately and is dedicated to detecting the presence or absence of the engaging object 31 in the hook mouth 4 and its size, the inherent safety of the hook is maintained and the sensing action can be performed reliably. Further, since the sensing position can be easily adjusted by adjusting the rotation angle of the lever 15 at the contact point of the micro switch 22, it can correspond to the size of the object to be engaged.

In addition, in the present invention, a groove 6 is provided in the abdomen of the hook body 3 and a through hole 8 is provided in the center of the connecting shaft 7 to communicate the two, and an electric wire 10 of an electric circuit is passed through them. Since the electric wire 10 does not touch the object, the electric wire 10 will not be cut.

In addition, the rotating connection between the hook body 3 and the rope coupling member 2 is electrically connected by rotating contact with the fixed terminal 9 and the rotating terminal 11, and since no electric wires are used, there is no risk of twisting. It has excellent durability and can maintain a secure connection even after long-term use. In addition, the connection part between the rope connection member 2 and the rope 29 is made using a thimble 12 in the shape of an approximate roller, and one end of the rope 29 is twisted and braided around it, and the electric wire 2
After taking out the thimble 12 and connecting it to the electrode 14 of the thimble 12, the thimble 12 is attached to the shaft 1 so that the electrode 14 contacts a predetermined conductor 17 inside the U rod 16.
3, the rope attachment part rotates together with the thimble 12 only in the direction about the attachment shaft 13, and does not rotate or bend in the direction orthogonal to it. Since the connection between the electric wire 23 and the electrode 14 of the thimble 12 is not subjected to load movements such as excessive bending or tension, the connection will not come off, resulting in outstanding durability and safety.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the front view of the hook of the first embodiment, Fig. 2 is its plan view, Fig. 3 is a front view of the hook of another embodiment, and Fig. 4 is the first embodiment of the conductor. 5 is a perspective view of the second embodiment of the conductor, FIG. 6 is a usage state diagram of the hook of the present invention, FIG. 7 is an electrical circuit diagram of the hook of the present invention, and FIG. 8 is a diagram of the hook of the present invention. A plan view of the futsuku. In the figure, 1 is a hook part, 2 is a rope connecting member, 3
is the hook body, 4 is the hook opening, 5 is the opening/closing cap, 6
is a groove, 7 is a connecting shaft, 8 is a through hole, 9 is a fixed terminal, 10 is an electric wire, 11 is a rotating terminal, 12 is a thimble, 13 and 24 are shafts, 14 is an electrode, 15 is a lever, 16 is a U Rod, 17 is a conductor, 18 is an insulator, 1
9 is a shaft hole, 20 is an electrode contact part, 21 is a synthetic resin,
22 is a micro switch, 23 is a lead wire, 25
is the safety cap, 26 is the rivet, 27 is the battery,
28 is a buzzer, 29 is a rope, 30 is a telescopic adjuster, 31 is a hooking object, A is a main hook, and B is an auxiliary hook.

Claims (1)

[Claims for Utility Model Registration] 1. A hook body 3 having a hook portion 1 at its tip and a rope connecting member 2 rotatably provided at its base end, with a hook opening 4 on the ventral side always biased in the direction of closing. An opening/closing cap 5 provided with a spring is provided, a groove 6 extending in the length direction is provided on the abdomen side of the hook body 3, and a through hole 8 is provided in the center of a connecting shaft 7 provided on the base end side. One or more fixed terminals 9 are provided at the end of the connecting shaft 7 which communicates with the grooved portion 6 and are insulated from other parts, and electronic components or electronic circuits are provided inside the hook body 3 or the opening/closing cap 5. One or more electric wires 10 extending from the electrodes of these electronic components or electric circuits are inserted through the grooved portion 6 and the through hole 8 and connected to the fixed terminal 9, and a rotary terminal 11 is brought into contact with the fixed terminal 9. is provided so as to rotate together with the approximate U rod 16 constituting the rope coupling member 2, and the thimble 12 is pivotally attached 13 to the inside of the U rod 16, and the thimble 1
2, an electrode 14 is provided on one or both sides of the rotary terminal 11, and the electrode 14 and the rotary terminal 11 are electrically connected;
The electrodes 14 are electrically connected to the electric wires of the ropes, and a lever 15 is provided whose tip protrudes into the hook opening 4 to sense a hook, and when the lever 15 is rotated, the electronic parts or the electric circuit are connected. switch 22
A safety hook featuring a structure that allows for on/off operation. 2. Electrically connect one of the electrodes of an electronic component or an electric circuit to the hook body 3, use the hook components as a conductor, and connect the thimble 1 of the rope coupling member 2.
The safety hook according to claim 1, which has been registered as a utility model, is characterized in that the hook is electrically taken out from the U rod 16 and connected to the electric wire of the rope. 3 One or more rotary terminals 11 are protruded from one end, and the rotary terminals 11 and the electrode 1 of the thimble 12 are connected to each other.
A utility model characterized by a structure in which the fixed terminal 9 and the electrode 14 of the thimble 12 are electrically connected by providing a conductor 17 on the inside of the U rod 16, the part of which is covered with synthetic resin except for the part where the terminal 4 contacts. A safety hook according to claim 1 or 2 of the registered claims. 4 Single or multiple conductors 1 whose parts are coated and insulated with synthetic resin except for the electrically connected parts
7 is provided along the inside of the U rod 16, and the rotating terminal 11 on one side and the electrode 14 of the thimble 12 on the other side are electrically connected to each other. Safety hook as described in paragraph 2. 5 The lever 15 has its base end rotatably pivoted to the hook body 3, and the spring 3 biases the tip end in a direction to abut the engaging object 31 fitted in the hook mouth 4.
3. The safety hook according to claim 1 of the utility model registration claim. 6. The lever 15 has a structure in which the base end thereof is rotatably pivoted to the opening/closing cap 5, and the tip end thereof is provided with a spring 33 that biases the lever 15 in the direction of abutting the engaging object 31 fitted in the hook opening 4. A safety hook according to claim 1 of the utility model registration claim characterized by: