JPH04115163A - Apparatus for detecting moving body - Google Patents

Abstract

PURPOSE:To make the waterproofness between a cable cover and a signal transmitting cable perfect by providing an annular clamp bringing the cover and the cable to a pressure contact state to the outer periphery of the part exposed from the case main body in the cable cover of the signal transmitting cable. CONSTITUTION:A cable 9 is inserted in and arranged to the lower opening end of a case main body 2 and a clamp 18 is provided to the part exposed from the main body 2 of the cable cover 10 made of a waterproof material protecting the cable 9. Since the annular contact part 18a of the clamp 18 is brought into contact with the cover 10 under pressure and the inner peripheral part 10b of the cover 10 comes into close contact with the outer periphery of the cable 9, the waterproofness between the cover 10 and the cable 9 becomes perfect. Further, the outer periphery of the contact part 18a is opened only by simple operation grasping a pair of the grasping pieces 18b, 18c of the clamp 18 and a clamped state can be released. By this simple constitution, the waterproofness between the cable 9 and the cover 10 can be perfectly achieved. Further, the cable 9 is fixed at a constant position by the clamp 18 and the core of the cable 9 can be set to an immovable state.

Description

[Detailed Description of the Invention] [Object of the Invention (Industrial Application Field) The present invention relates to a moving object detection device, and more specifically,
The present invention relates to a moving object detection device that detects the moving state of a moving object that moves linearly or rotationally, such as a rack in a rack and pinion mechanism or a gear.

(Prior Art) A conventional example of this type of moving object detection device will be described with reference to FIG.

The moving object detection device 50 shown in the figure includes a case body 51 made of, for example, synthetic resin, which is formed in a cylindrical shape and has one end covered with a thin walled closing portion 51a, and a case body 51 made of, for example, synthetic resin, and detection on the inner surface of the closing portion 51a. Hall IC constituting the face-facing detection unit 52
55, a signal transmission cable 53 disposed on the other open end side of the case body 51, and a synthetic resin filler 58 filled inside the other open end side of the case body 51. There is.

The detection section 52 includes the Hall IC 55 and the Hall IC.
A magnet 56 for applying a magnetic field to the magnet 55 and a yoke 57 for forming a magnetic path are provided.

In addition, the three lead wires 55a, 5 of the Hall IC 55
5b and 55c are led out along the side surface of the detection unit 52 so as to be located below the yoke 57, and are connected to the cable 5.
3, three core wires 53a.

53b and 53c, and are connected to each other by soldering or the like.

Further, as shown in FIG. 6, a cable cover 59 made of, for example, rubber is fitted over the cable 53 from the inside of the other open end of the case body 51 to the outside for a predetermined length. The outer periphery of the cable 53 in the area is protected.

A recess 59a is formed on the outer periphery of the cable cover 59, which prevents the cable cover 59 from coming off from the case body 51 even if it is pulled.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned moving object detection device 50,
Since the cable cover 59 is simply fitted onto the outer circumference of the cable 53, due to dimensional changes of the cable cover 59 and the cable 53 over time, the inner circumference of the cable cover 59 and the inner circumference of the cable cover 59 may change as shown in FIG. A gap G is created between the cable 53 and the outer periphery of the cable 53, causing water or the like to enter the case body 51, which poses a problem in terms of waterproofness.

In the past, attempts have been made to prevent the occurrence of the gap G (using fasteners), but there have been problems in that the structure is large and tools and jigs are required.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a moving object detection device that has a simple configuration, is easy to operate, has complete waterproofness between a cable and a cable cover, and is highly reliable.

[Configuration of the Invention (Means for Solving the Problems) The present invention provides a signal transmission cable that is provided with a detection section on one end side of a case body, and connected to the detection section from the other end side of the case body. And in a moving object detection device in which a cylindrical cable cover made of waterproof material is fitted around the outer circumference of the cable, the cable cover is pressed against the outer circumference of the portion of the cable cover exposed from the case body. It is equipped with an annular fastener.

The fastener includes an annular contact portion made of an elastic wire having an inner diameter slightly smaller than the outer diameter of the portion of the cable cover exposed from the case body, and a ring-shaped contact portion that protrudes laterally from the annular contact portion to prevent external force. and a gripping piece that expands the inner diameter of the annular abutting part under the action of the gripper.

(Function) According to the moving object detection device configured as described above, a fastener is provided on the outer periphery of the portion of the cable cover made of waterproof material that protects the cable that is exposed from the case body, and the fastener allows the cable cover to be fastened. Since it is pressed into contact with the outer periphery of the cable, the waterproofness between the cable cover and the cable is completely ensured, and water and the like are prevented from entering the case body.

Since the fastener is formed of an annular abutting part made of an elastic wire and a gripping piece that can expand the inner diameter of this annular abutting part, the cable cover can be tightened to the cable simply by operating the gripping piece. can be performed very easily.

(Example) The present invention will be explained in detail below.

The moving object detection device 1 shown in FIG. 1, FIG. 4, and FIG.
The case body 2 is made of a non-magnetic soft metal, that is, aluminum, and has a substantially cylindrical shape and has a disk-shaped mounting plate 2a formed on the lower end side. A detection unit 7 consisting of a holder 3, a Hall IC 4 held by the holder 3, a magnet 5, and a yoke 6 stacked together, and a detection unit 7 made of a non-magnetic hard metal, that is, a thin A lid body 8 consisting of an integral structure of a top plate part 8a made of stainless steel and a bent part 8b, a cable 9 having a three-core structure inserted through the other open end side of the case body 2, and a case for this cable 9. A cable cover 10 made of rubber that surrounds the inside of the main body 2 and a portion protruding downward from the case main body 2, a synthetic resin filler 12 filled in the case main body 2, and the cable cover 10.
It has a substantially annular fastener 18 that brings the cable cover 10 into close contact with the cable 9 above the flange 10a provided at the protruding end of the cable.

As shown in FIGS. 2(a) and 2(b), this fastener 18 has an annular contact portion 18a made of an elastic wire (for example, stainless steel wire) and having an inner diameter slightly smaller than the outer diameter of the cable cover 10. and a pair of gripping pieces 18b and 18c that protrude laterally from the annular abutting part 18a and expand the inner diameter of the annular abutting part 18a under the action of an external force.

That is, for the pair of gripping pieces 18b and 18C as shown in FIG.
By applying force with a finger or the like in the direction of the arrow shown in a), the inner diameter of the annular contact portion 18a expands, and by releasing the finger or the like, the inner diameter of the annular contact portion 18a contracts. (
As shown in C), the annular contact portion 18a is attached to the cable cover 1.
The inner periphery 10b of the cable 9 is pressed against the outer periphery of the cable 9.

Note that a double helix structure fastener may be used instead of the fastener 18.

The top plate portion 8a of the lid body 8 covers the entire area of one opening end of the case body 2. In addition, the bent portion 8 of the lid body 8
b is fitted in sliding contact with the inner circumferential surface of one open end of the case body 2, as shown in FIG. The fitted O-ring 14 as a sealing member comes into close contact with the bent portion 8b, thereby sealing the inside of the case body 2 from the outside space.

Further, the holder 3 is provided with three connection holes 15 that penetrate the right side thick portion of the detection portion 7 from the upper end to the lower end.

The connection hole 15 includes a lower hole 15a through which the ends of the three core wires 17 of the cable 9 are inserted, as shown in FIG.
It is formed of an upper hole portion 15b through which the end of each lead 4a of the Hall IC 4 faces, and a small hole portion 15c that communicates the lower hole portion 15a and the upper hole portion 15b. Each core wire 17 and each lead 4a of the Hall IC 4 are connected by the connecting member 16.

In addition, in FIG. 1, FIG. 4, and FIG. 5, 2C is a mounting hole.

Next, the operation of the above-mentioned moving object detection device 1 will be explained, focusing mainly on the tightening operation of the cable cover 10 using the tightening tool 18.

According to this moving object detection device 1, the annular contact portion 18a of the fastener 18 presses against the cable cover 10, and the inner peripheral portion 10b of the cable cover 10 presses against the cable 9 as shown in FIG. 2(C). Since the cable cover 1 is in close contact with the outer periphery of
0 and the cable 9 is completely waterproof.

Also, a pair of gripping pieces 18b of the fastener 18.

Annular contact part 1 can be removed by simply holding 18c with fingers, etc.
The outer periphery of 8a can be expanded to release the tightened state.

In this way, according to this embodiment, the configuration is simple, and
The cable 9 and the cable cover 10 can be completely waterproofed without requiring any jigs or tools.

Furthermore, since the cable cover 10 is brought into close contact with the cable 9 by the fastener 18, the cable 9 can be fixed in a fixed position and the core wire 17 can be kept immovable.

In addition to the embodiments described above, the present invention can be modified in various ways within the scope of its gist.

[Effects of the Invention] According to the present invention described in detail above, with the above-described configuration, the cable cover can be brought into close contact with the cable by the elasticity of the fastener, and the waterproofness between the cable cover and the cable can be completely maintained. It is possible to provide a moving object detection device capable of detecting a moving object.

Further, since the annular contact portion of the fastener can be expanded simply by operating the pair of gripping pieces, no tools are required, and it is possible to provide a moving object detection device with extremely excellent operability during tightening.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the moving object detection device of the present invention, FIG. 2(a) is a plan view of the same fastener, and FIG.
) is a partial perspective view of the above cable cover in the attached state, Fig. 2 (C) is a sectional view of the above cable cover in the tightened state, and Fig. 3 is an enlarged view showing the cover body and OIJ ring in this example. 4 is a front view of the moving object detection device of this embodiment, FIG. 5 is a plan view of the same as above, FIG. 6 is a sectional view of the conventional moving object detection device, and FIG. 7 is a portion of the same as above. This is an enlarged view. 1... Moving object detection device, 2... Case body, 9
...Cable, 10...Cable cover 18...
- Fastener, 18a... annular contact part, 18b, 18c
...gripping piece. Ic) Figure Figure Figure

Claims (2)

[Claims] (1) A detection section is provided at one end of the case body, and a signal transmission cable connected to the detection section from the other end of the case body, and a cylindrical tube made of waterproof material fitted around the outer circumference of the cable. A moving object detection device having a cable cover, characterized in that a ring-shaped fastener is provided on the outer periphery of a portion of the cable cover exposed from the case body to press the cable cover into contact with the outer periphery of the cable. Detection device. (2) The fastener includes an annular contact portion made of an elastic wire having an inner diameter slightly smaller than the outer diameter of the portion of the cable cover exposed from the case body, and a ring-shaped contact portion that protrudes laterally from the annular contact portion. The moving object detection device according to claim 1, further comprising a gripping piece that expands the inner diameter of the annular contact portion under the action of an external force.