JPH034805Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coil fixing device for spirally winding and fixing a coil around a cylindrical body.

[Prior art]

Conventionally, for example, a heating element as shown in FIG. 1 has been used in a part of a hot runner block of an injection mold.

In FIG. 1, reference numeral 50 denotes a heating element used in a part of the hot runner block. A sheathed heater 52, a band 53 provided on the outside of the sheathed heater 52 and having flanges 53a and 53b formed at both ends, and a flange 5 of the band 53.
It is composed of bolts 54 and nuts 55 provided at 3a and 53b.

When the sheathed heater 52 is wound spirally around the cylindrical body 51 and fixed, a spiral sheathed heater 52 having an inner diameter slightly larger than the outer diameter of the cylindrical body 51 is made in advance, and this sheathed heater 52 is A heater 52 is inserted into a cylindrical body 51, its outside is covered with a band 53, and a bolt 54 is tightened with a nut 55.

However, in such a fixing method, since the sheathed heater 52 is tightened to the cylindrical body 51 only by the tightening force of the band member 53, the inner diameter of the spiral sheathed heater 52 is not easily reduced. , there is a problem that a gap is created between the cylindrical body 51 and the sheathed heater 52, making it difficult for the heat of the sheathed heater 52 to be transmitted to the cylindrical body 51. In order to solve this problem, the inner diameter of the sheathed heater 52 is
1, and wrap the cylindrical body around the sheathed heater 52 so that it is slightly smaller than the outer diameter of the belt 53.
A fixing method is used in which it is tightened with a screw. However, in this fixing method, the sheathed heater 5
2 must be loosened to wind it around the cylindrical body 51, which not only requires a lot of work time, but also has the problem that sufficient tightening force cannot still be obtained.

[Purpose of invention]

This invention was devised to solve the above-mentioned problems, and its purpose was to spirally wrap a coil around a cylindrical body, fix one end of the coil to the cylindrical body, and fix the other end of the coil around the cylindrical body. An object of the present invention is to provide a coil fixing device that can obtain sufficient tightening force by being hooked to a metal fitting.

[Structure of the idea]

In order to achieve the above object, the configuration of the coil fixing device according to the present invention is a coil fixing device that spirally winds and fixes a coil around a cylindrical body.
An annular tightening fitting having flanges formed at both ends is provided around the circumferential surface of the cylindrical body, a tightening body having a worm screw is provided on the flange of the tightening fitting, and a coil is spirally wound around the cylindrical body,
One end of the worm screw is fixed to the cylindrical body, and the other end is hooked to a tightening fitting, and the coil is tightened by rotating the tightening body provided on the flange of the tightening fitting and carving the tooth profile of the worm screw on the cylindrical body. It is designed to tighten.

[Effect of invention]

In such a coil fixing device, when tightening and fixing the coil to the cylindrical body, the tightening body provided on the flange of the tightening fitting is rotated,
Gradually move the worm screw of the tightening body along the circumferential surface of the cylindrical body. At this time, the tooth profile of the worm screw is sequentially formed on the circumferential surface of the cylindrical body and moves, and the coil latched onto the tightening fitting is gradually tightened following the tooth profile of the worm screw. By continuing to rotate the tightening body, the coil is further tightened, and when a predetermined tightening force is reached, the rotation of the tightening body is stopped, and the coil is fixed to the cylindrical body by the tightening force.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 2 is an exploded perspective view of the coil fixing device according to the present invention, Fig. 3 is a perspective view of the coil fixing device according to the present invention, Fig. 4 is an enlarged sectional view of the fastening fitting according to the present invention, and Fig. 5 is It shows an enlarged view of the vicinity of the tightening body according to the present invention.

In FIGS. 2 to 5, reference numeral 1 denotes a cylindrical body made of a relatively soft metal material such as copper, aluminum, zinc, gunmetal, etc., and a clasp 3 is attached to one side of the cylindrical body 1 with a bolt 2. is removably provided. Further, a partially open annular fastening fitting 4 is provided around the circumferential surface of the cylindrical body 1 and is adapted to move along the circumferential surface of the cylindrical body 1 . Furthermore, flanges 5a and 5b extending in the opposite direction to the cylindrical body 1 are provided at the open ends of the tightening fittings 4, respectively.
is formed, and cut grooves 6a and 6b extending obliquely upward are formed on the side surfaces thereof. and,
A concave groove 7 is formed on the inner surface of the fastening metal fitting 4, and concave retaining grooves 8a and 8b are formed on mutually opposing parts.

Further, in the cut grooves 6a and 6b of the clamping fitting 4, a clamping body 9 made of a sufficiently hard metal material such as alloy steel is provided.
is removably installed, and the tightening metal fitting 4
It is designed to tighten or loosen. A bulging portion 9 is provided at one end of the tightening body 9.
a is formed, and a cut groove 9b is formed in the lateral direction at the tip thereof.

Further, a spiral groove 9c is formed at the other end of the tightening body 9, and a sharp worm screw 9d is formed between the spiral groove 9c and the bulge 9. As a result, the worm screw 9d is located between the flanges 5a and 5b formed on the fastening fitting 4,
Two nuts 10a and 10b are screwed into the spiral groove 9c and fixed.

Furthermore, a hook 11 is provided in one of the retaining grooves 8b formed in the fastening metal fitting 4. A hanging piece 11a extending in the opposite direction of the cylindrical body 1 is formed at one end of this hanging body 11, and two claw pieces 11b and 11c are formed at the other end. Further, a gold piece 13a is fixed to one end of the spiral coil 12, and a metal piece 13b is fixed to the vicinity of the other end.

In the coil fixing device configured as described above, when tightening the coil 12 to the cylindrical body 1,
First, the inner diameter of the coil 12 is formed into a spiral shape slightly larger than the outer diameter of the cylindrical body 1, and in this state, the coil 12 is
is inserted into the cylindrical body 1. Next, the inner side of the metal piece 13a fixed to one end of the coil 12 is fixed with the clasp 3 of the cylindrical body 1, and the metal piece 13b fixed near the other end is fastened to the latching member of the metal fitting 4. 11 claw pieces 11b and 1c.

Thereafter, the tip of a driver (not shown) is inserted into the cut groove 9b formed in the bulge 9a of the tightening body 9, and one nut 10b is screwed into the spiral groove 9c of the tightening body 9. Next, the tightening body 9 is rotated in the direction of arrow A using a driver to gradually move the worm screw 9d along the circumferential surface of the cylindrical body 1.

As a result, the worm screw 9a of the tightening body 9 is moved while biting into the cylindrical body 1 while forming a tooth profile 14 along the circumferential surface of the cylindrical body 1, and the tightening fitting 4 is moved in the direction of arrow B along the circumferential surface of the cylindrical body 1. At the same time, the coil 12 latched onto the tightening fitting 4 is gradually tightened accordingly.

By continuing the rotation of the tightening body 9, the coil 12 is further tightened, and when a predetermined tightening force is reached, the rotation of the tightening body 9 is stopped. The tightening force at that time is the coil 12
is in close contact with the circumferential surface of the cylindrical body 1. When this close contact is achieved, the coil 12
The tightening work is completed, and the coil 12 is attached to the cylindrical body 1.
The other nut 10a is fixed to the tightening body 9
is tightened by the spiral groove 9c.

Coil 12 tightened as described above
Due to the relationship between the self-tapping teeth 14 formed on the circumferential surface of the cylindrical body 1 and the worm screw 9a, the worm screw 9a will no longer loosen and will be maintained as it is by the tightening force.

In this embodiment, after the coil 12 is tightened, the band 53 described in the prior art of FIG. 1 covers the coil 12.

[Effect of idea]

As explained above, in the coil fixing device according to the present invention, the coil is spirally wound around the circumferential surface of the cylindrical body, one end of which is fixed to the cylindrical body, and the other end is fixed to the cylindrical body by a tightening device provided around the cylindrical body. Since the clamping fixture is hooked onto the metal fitting and moved along the circumferential surface of the cylindrical body by the clamping body, it is possible to obtain a sufficient tightening force with a small force.

In addition, in this invention, since sufficient tightening force is obtained, no gap is created between the cylindrical body and the coil, so it can be used, for example, as a part of the hot runner block of an injection mold. In the case of a heating body that is similar to the above, there is an effect that heat can be sufficiently transferred to the cylindrical body.

Further, in the present invention, due to the relationship between the self-tapping teeth formed on the circumferential surface of the cylindrical body and the worm screw when tightening the coil, a constant tightening force can be maintained at all times.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view illustrating a conventional coil fixing device. FIG. 2 is an exploded perspective view of the coil fixing device according to the present invention. FIG. 3 is a perspective view of the coil fixing device according to the present invention. FIG. 4 is an enlarged sectional view of the fastening fitting according to the present invention. FIG. 5 is an enlarged view of the vicinity of the tightening body according to the present invention. 1... Cylindrical body, 2... Bolt, 3... Clasp,
4... Tightening metal fittings, 5a, 5b... Flange, 6
a, 6b...cut groove, 7...concave groove, 8a, 8b...
...Retaining groove, 9...Tightening body, 9a...Bulging portion, 9
b... Cut groove, 9c... Spiral groove, 9d... Worm screw, 10a, 10b... Nut, 11... Latching body, 11a... Hanging piece, 11b, 11c... Claw piece, 12... Coil, 13a, 13b... gold pieces,
14...Tooth shape.

Claims (1)

[Scope of utility model registration request] A coil fixing device that spirally winds and fixes a coil around a cylindrical body, the coil fixing device having a coil on the circumferential surface of the cylindrical body,
An annular tightening fitting having flanges formed at both ends is provided around the circumference, a tightening body having a worm screw is provided on the flange of the tightening fitting, a coil is spirally wound around the cylindrical body, and one end of the coil is fixed to the cylindrical body. In addition, the other end is hooked to a tightening fitting, and a tightening body provided on a flange of the tightening fitting is rotated to tighten the coil while engraving the tooth profile of the worm screw on the cylindrical body. Coil fixing device.