JP3442567B2 - Push rod and body in push switch, molding method thereof and handling method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push rod and a body forming method in a push switch.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional two-contact type push switch used for operating a power window or a power seat of an automobile. The push switch 51 includes a housing 52, a PC plate 53, a pair of rubber springs 54, a pair of push rods 55, a body 56, and a knob 57.
The push switch 51 is assembled by molding the above-mentioned parts separately and then manually incorporating other parts into the housing 52.

The bottom inner wall 52a of the housing 52 has a PC
The plate 53 is arranged. The PC board 53 has electrodes (not shown) on its surface. The rubber spring 54 is composed of a hollow conical portion 54a that is open outward and a cylindrical portion 54b that is also open outward. A contact 54c made of a conductor is formed on the bottom of the conical portion 54a. The rubber spring 54 is arranged on the PC plate 53 so that its contact point 54c faces the electrode of the PC plate 53.

The push rod 55 is a column having a constant diameter. The push rod 55 has a first end 55a and a second end 55b. The push rod 55 is
Tsuba 5 formed so as to project at a position close to the first end 55a
With 5c. The first end 55a of the push rod 55 is inserted into the cylindrical portion 54b of the rubber spring 54. The body 56 has a pair of rod recesses 56a. Body 56
Is the bottom inner wall 56b of each rod recess 56a.
And the through hole 5 provided so as to communicate with the outer wall 56c.
With 6d.

The body 56 accommodates the rod 55 and the rubber spring 54 in the rod recess 56a, and at the same time, the rod 55
Is fixed on the PC plate 53 so that the second end portion 55b of the is projected from the through hole 56d.

The knob 57 has an abutting portion 57a formed at positions near both ends of the knob 57, and a support shaft 57b located in the middle of the abutting portion 57a. The knob 57 is rotatable about the support shaft 57b while the contact portion 57a is in contact with the second end 55b of the rod 55.
Be assembled into.

[0007]

The components of the push switch 51 are the housing 52, the PC board 53,
The number of rubber springs 54, the pair of push rods 55, the bodies 56, and the knobs 57 are large. This large number of components increases the number of assembly steps and makes the work difficult.
Also, the assembly of the push switch 51 is a manual work, and each component is small. This increases the likelihood of component loss.

The present invention has been made to solve the above problems, and an object thereof is to provide a push rod and a body in a push switch which is easy to perform with a small number of assembling steps, a forming method thereof and a handling method thereof. To do.

[0009]

In order to solve the above problems, the invention according to claim 1 provides a body for covering an elastic body provided with a contact for electrically connecting electrodes, and the elastic body. A rod-shaped push rod movably supported in the through hole, the first end portion being in contact with the second end portion protruding outward from the through hole formed in a part of the body;
In the push switch integrally molded by color molding
A push rod and a body, wherein the push rod
Has a diameter that decreases from the predetermined position toward the second end.
Has a tapered portion, and the through hole of the body is
The gist is that it is formed so as to be in close contact with a part of the tapered portion of the rod .

[0010]

According to a second aspect of the present invention, a body covering an elastic body having a contact for electrically connecting electrodes, a first end portion contacting the elastic body and a part of the body are provided. A push rod and body forming method in a push switch, comprising: a rod-shaped push rod that is movably supported by the through hole and that has a second end portion that protrudes outward from the formed through hole; A step of molding the push rod with a movable side mold and a first fixed side mold; and a movable side mold and a second fixed side mold with the push rod fixed to the movable side mold. The gist of the invention is that it comprises a step of clamping a die and a step of integrally forming a body with the push rod by the movable side die and the second fixed side die.

According to a third aspect of the present invention, in the method for forming the push rod and the body in the push switch according to the second aspect , the push rod has a diameter from a predetermined position toward the second end. The gist of the present invention is that a tapered portion is formed to be small and the body is molded so as to be in close contact with a part of the tapered portion of the push rod, thereby forming a through hole in a part of the body.

A fourth aspect of the present invention is a method of handling a push rod and a body in a push switch integrally formed by two-color molding, wherein the push rod and the body are assembled to the push switch. Sometimes by applying pressure to the second end of the push rod,
The gist is that the push rod and the body are separated.

Therefore, according to the first aspect of the present invention, since the push rod and the body are integrally molded by two-color molding, the number of steps for manufacturing the push switch is reduced. Also ,
The push rod is formed so that a taper portion whose diameter decreases from a predetermined position of the push rod toward the second end and the through hole of the body is formed so as to be in close contact with a part of the taper portion. And the body can be separated easily.

According to the second aspect of the present invention, the push rod is molded by the movable mold and the first fixed mold, and the movable rod is fixed to the movable mold while the push rod is fixed to the movable mold. The mold and the second fixed-side mold are clamped, and the two molds clamped together mold the body integrally with the push rod. This reduces the push switch manufacturing process.

According to the third aspect of the present invention, the push rod is formed with a taper portion which is smaller in diameter from a predetermined position toward the second end, and the body is formed so as to be in close contact with a part of the taper portion. As a result, a through hole is formed in a part of the body. This facilitates separation of the push rod and body.

According to the invention of claim 4 , the push rod and the body are integrally assembled to the push switch. Then, the push rod is separated by the pressure being applied to the second end thereof, so that the assembly is facilitated and the parts management is facilitated.

[0018]

DETAILED DESCRIPTION OF THE INVENTION A push switch assembling method embodying the present invention will be described below. FIG. 1 shows a cross section of a two-contact push switch. Push switch 1
Is used for operating power windows and power seats in automobiles. Push switch 1 is housing 2
In addition, the PC board 3, the pair of rubber springs 4, the pair of push rods 5, the body 6, and the knob 7 are included. The push switch 1 is manufactured by incorporating other components in the housing 2. In the present invention, the push rod 5 and the body 6 are integrally formed by two-color molding, and are separated when assembled in the housing 2.

As shown in FIG. 1, a PC plate 3 is arranged on the bottom inner wall 2a of the housing 2. The PC board 3 has electrodes (not shown) on its surface. The rubber spring 4 is composed of a hollow conical portion 4a that is open outward and a cylindrical portion 4b that is also open outward. A contact 4c made of a conductor is formed on the bottom of the conical portion 4a. The rubber spring 4 is arranged on the PC plate 3 so that its contact point 4c faces the electrode of the PC plate 3.

The push rod 5 has a substantially cylindrical shape. The push rod 5 has a first end 5a and a second end 5b. The push rod 5 has a first end 5
The collar 5c is formed so as to project at a position close to a. The diameter of the push rod 5 is constant between the collar 5c and the first end 5a. In contrast, a tapered portion 5d having a smaller diameter is formed from the flange 5c of the push rod 5 toward the second end 5b. Then, the first end 5a of the push rod 5 is inserted into the cylindrical portion 4b of the rubber spring 4.

The body 6 has a pair of rod recesses 6a. The body 6 is an inner wall 6 of each rod recess 6a.
through hole 6 provided so as to communicate b with the outer wall 6c
have d. The diameter of the through hole 6d is the largest at the bottom inner wall 6b and the smallest at the outer wall 6c of the body 6. In the body 6, the rod 5 and the rubber spring 4 are housed in the rod recess 6a, and at the same time, the second end 5b of the rod 5 is accommodated.
Are fixed on the PC board 3 so that the projections protrude from the through holes 6d. The collar 5c and the bottom inner wall 6b of the rod recess 6a are separated from each other.

The knob 7 has an abutting portion 7a formed at positions near both ends thereof, and a support shaft 7 located in the middle of the abutting portion 7a.
b and. The knob 7 is attached to the housing 2 so as to be rotatable about the support shaft 7b while making the respective contact portions 7a contact the second end 5b of the rod 5.

A method of forming the push rod 5 and the body 6 will be described below with reference to FIGS. 2 and 3. FIG. 2 shows two molds for molding the push rod 5. The movable mold 21 has a recess 21a for molding the first end 5a of the push rod 5 and the collar 5c, and a surface 21b for molding the inner wall 6b of the body 6. The first fixed mold 22 includes a molding mold 22a and a runner mold 22b. Mold 2
2a has a portion of the push rod 5 on the second end 5b side, that is, a recess 22c for molding the tapered portion 5d, and a runner recess 22d for resin injection. The runner die 22b has a runner recess 22e. Runner recess 2
2d and 22e form a runner 23. The runner 23 is connected to a sprue (not shown) via the runner recess 22e. Then, the first fixed-side die 22 and the movable-side die 21 to which the molding die 22a and the runner die 22b are joined are joined so that the concave portions 21a and 22c formed on both sides are aligned with each other, The mold is clamped. The recesses 21a and 22c form a push rod cavity 24. Next, the molten resin R1 (polyacetal in the present embodiment) is injected into the cavity 24 from the sprue (not shown) via the runner 23. After the resin R1 is solidified, that is, after the push rod 5 is molded, first, the molding die 22a and the runner die 22b that form the first fixed-side die 22.
And are separated. At this time, the resin R solidified in the runner 23
1 remains in the recess 22d of the molding die 22a. Next, the solidified resin R1 is removed from the recess 22d. Then, the movable mold 21 is separated from the molding mold 22a of the first fixed mold 22. At this time, the resin R1 molded and solidified by the push rod cavity 24, that is, the push rod 5 is moved to the second fixed mold 25 together with the movable mold 21 while being fixed to the movable mold 21. It

As shown in FIG. 3, the second fixed side mold 25
Has a recess 25a for molding the outer wall 6c of the body 6, a hole 25b into which the second end 5b side of the push rod 5 is to be inserted, and a runner 25c communicating with the recess 25a. The hole 25b is formed so that the push rod 5 can be inserted without a gap. The movable mold 21 and the push rod 5 fixed thereto are joined to the second fixed mold 25 and clamped. At this time, the second push rod 5
The end 5b side is inserted into the hole 25b. Movable mold 21
Surface 21b and the concave portion 25a of the second fixed mold 25 are
A cavity 26 for molding the body 6 is formed.
Molten resin R2 (ABS in the present embodiment) is injected from a sprue (not shown) via a runner 25c. As shown in FIG. 4, after the resin R2 is solidified, the integrated push rod 5 and body 6 are removed from the mold.
At this time, the collar 5c of the rod 5 and the rod recess 6 of the body 6
The inner wall 6b of a is in close contact. The body 6 bites into the push rod 5 due to resin contraction. Therefore, the push rod 5 and the body 6 are not separated.

The integrated push rod 5 and body 6 shown in FIG. 4 are assembled in the housing 2 as parts of the push switch 1. The two parts are separated by assembling the knob 7 with its abutting portion 7a abutting on the second end 5b of the push rod 5. That is, a tapered portion 5d having a gradually increasing diameter is formed from the second end portion 5b of the push rod 5 to the collar 5c.
The through-hole 6d also has the same shape. At the time of assembling, pressure is applied by the knob 7 from the second end 5b toward the first end 5a. Therefore, the push rod 5 which receives the pressure from the second end 5b is separated from the body 6. Further, as shown in FIG. 1, the two contacts 4c are both P
When separated from the C plate 3, that is, when the two switches are both off, the flange 5a and the inner wall 6b are separated from each other. This means that a gap is always formed between the tapered portion 5d and the through hole 6d.

This embodiment has the following features. (1) According to the present invention, after the push rod 5 is molded by the movable mold 21 and the first fixed mold 22, the push rod 5 remains on the movable mold 21. Next, the movable mold 21 forms the body 6 together with the second fixed mold 25. As described above, the push rod 5 and the body 6 are integrally molded. Therefore, the manufacturing process of the push switch 1 is reduced. (2) Push rod 5 and body 6 formed integrally
And are separated when the push switch 1 is assembled. That is, the push rod 5 is separated from the body 6 by pushing the second end portion 5b of the push rod 5 against the contact portion 7a of the knob 7. Therefore, the operator does not need to directly handle the push rod 5 which is easily lost, so that the assembly becomes easy. This reduces the working process, reduces the possibility of losing the push rod 5 at the same time, and facilitates parts management. (3) A tapered portion 5d having a diameter gradually decreasing is formed from the flange 5c of the push rod 5 to the second end 5b.
Further, since the through hole 6d formed in the body 6 is defined and shaped by the tapered portion 5d, it is similarly tapered. Therefore, when the second end 5b of the push rod 5 is pushed by the abutting portion 7a of the knob 7, the push rod 5 is easily separated from the body 6. Note that the present invention can be embodied by being arbitrarily modified as follows.

(1) In the present embodiment, the push rod 5 is made of polyacetal and the body 6 is made of ABS. However, other resins (for example, polyamide, polyethylene or polypropylene, body 6 are used for the push rod 5). AS, polystyrene or GF-AS
Etc.) may be used. Alternatively, the push rod 5 and the body 6 may be molded from the same resin and separated by a release agent.

(2) In the present embodiment, the push switch 1 is of a two-contact type used for a power window or a power seat of an automobile. However, the present invention is a single-contact type switch or a game controller. It may be applied to the assembly of a contact type switch.

Although the embodiment of the invention has been described above, technical ideas other than the claims which can be understood from the embodiment will be described below together with the effect thereof. Claim 2
In the method of molding the push rod and the body in the push switch described in (1), the flange 5c of the push rod 5 and the inner wall 6b of the body 6 are separated at the time of assembling the push switch 1, and are kept separated thereafter. As a result, a gap is always formed between the tapered portion 5d of the rod 5 and the through hole 6d of the body 6, so that the rod 5
The vertical movement of is smooth.

[0030]

As described in detail above, according to the present invention,
It is possible to provide a push rod and a body in a push switch, a molding method thereof and a handling method thereof, which are easy to perform with a small number of assembling steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a push switch.

FIG. 2 is a sectional view of a mold for molding a push rod.

FIG. 3 is a cross-sectional view of a mold for molding a body.

FIG. 4 is a cross-sectional view showing a push rod and a body that are integrally formed.

FIG. 5 is a sectional view showing a conventional push switch. 1 ... Push switch, 4 ... Rubber spring as elastic body,
4c ... contact, 5 ... push rod, 5a ... first end,
5b ... 2nd end part, 5d ... tapered part, 6 ... body, 6d
… Through holes.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Umeo Arao Noda No. 1 in Toyota, Oguchi-cho, Niwa-gun, Aichi Prefecture Tokai Rika Electric Co., Ltd. (56) Reference JP-A-9-193723 (JP, A) ) JP-A-6-196045 (JP, A) JP-A-6-79047 (JP, A) Actually open flat 7-18332 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 45/16 H01H 11 / 00,23 / 00-23/30

Claims (4)

(57) [Claims] 1. A body covering an elastic body having a contact for electrically connecting electrodes, a first end contacting the elastic body, and a through hole formed in a part of the body to the outside. a push rod and the body of the flop Tsu Gerhard switch molded integrally with the rod-like push rod is movably supported in the through hole and a second end projecting, the at two-color molding, The push rod extends from a predetermined position to the second end.
Has a taper that reduces its diameter,
The through hole is in close contact with a part of the tapered portion of the push rod.
In push switch molded as
Dead and body . 2. A contact for electrically connecting electrodes is provided.
A body that covers the elastic body, and a first body that contacts the elastic body
Through the through hole formed in the end of the body and a part of the body
A second end portion protruding from the through hole and movably supported in the through hole.
Push rod that includes a rod-shaped push rod
Is the method of molding the push rod and body in
The movable rod mold and the first fixed mold, the push rod
And a state in which the push rod is fixed to the movable mold.
Then, the process of clamping the movable side mold and the second fixed side mold
And the movable side mold and the second fixed side mold,
Forming the body integrally with the push rod and the push rod and body in the push switch consisting of
Day molding method. 3. The push switch according to claim 2,
In the method of forming the push rod and the body,
From the predetermined position on the push rod to the second end
Form a taper part whose diameter becomes smaller and
Note that the push rod is designed to be in close contact with part of the taper part.
Forming a through hole in a part of the body
The push rod and body of the push switch
Molding method. 4. A push-molded integrally formed by two-color molding.
Handling of-flops Sshuroddo and the body in Yusuitchi
A method for pushing the push rod and body
The second end of the push rod when assembled on the switch.
By applying pressure to the section, push rod and body
The push switch with the
How to handle shrods and bodies.