JPH0636168U - Switch mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a switch mechanism in which an excessive load is not applied to the switch portion when the knob is pushed. [Structure] A housing 1, a knob 3 mounted so as to be freely pushed into the housing 1, a switch portion 5 that opens and closes contacts by abutting against a pushing portion 3a of the knob 3 when the knob 3 is pushed, and a knob 3 when pushing the knob 3. The switch mechanism includes a stopper 7 that regulates the pushing size of the knob so that an excessive load is not applied to the switch portion 5. It is characterized in that the push-in portion 3a of the knob 3 or the switch portion 5 is provided with a cushioning member 13 for alleviating an impact when the knob is pushed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch mechanism of a type in which a contact of a switch section is opened and closed by pushing a knob.

[0002]

[Prior art]

 In general, as shown in FIG. 3, a housing 1, a knob 3 that is pushed into the housing 1 and is mounted on its own, and when the knob 3 is pushed in, abuts against a pushing portion 3a of the knob 3 and contacts (not shown). ) Is opened and closed, and a switch mechanism including a stopper 7 that restricts the pushing dimension of the knob 3 so that an excessive load is not applied to the switch portion 5 when the knob 3 is pushed is known.

In this type, the switch section 5 is soldered 100 to the board 9, and the board 9 is fixed to the bottom of the housing with screws 11.

[0004]

[Problems to be solved by the device]

 However, in the conventional configuration, if the manufacturing dimensions of the switch mechanism components are varied, the contact point of the switch section 5 makes a full stroke before the back surface of the knob 3 hits the stopper 7. It can happen. In such a case, the entire operating force of the knob 3 thereafter acts on the board 9 via the switch portion 5, so that the board 9 bends and an excessive load is applied to the soldering portion 100 of the switch portion 5. However, there is a problem that the solder peels off.

For this reason, conventionally, a through-hole type substrate 9 is used to ensure the reliability of the soldered portion 100, but using this through-hole type substrate 9 results in high cost. There is a problem.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique and to provide a switch mechanism in which an excessive load is not applied to the switch portion when the knob is pushed.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a housing, a knob that is pushably mounted on the housing, and a switch portion that abuts the pushing portion of the knob to open and close the contact when the knob is pushed, In a switch mechanism that has a stopper that regulates the pushing-in dimension of the knob so that an excessive load is not applied to the switch when pushing the knob, it is necessary to reduce the impact when pushing the knob into the pushing-in portion of the knob or the switching portion. It is characterized in that a buffer member is provided.

[0008]

[Action]

 Generally, when manufacturing this type of switch mechanism, the dimensions of each component are controlled in the manufacturing process so that when the knob is pushed in and the back surface of the knob hits the stopper, the contact point of the switch section just makes a full stroke. To do. However, there are variations in the dimensions of the parts, and as a result, the dimensions of the switch may be excessively pushed. In such a case, according to the present invention, when the knob is fully pushed, after the contact of the switch section has full stroke, the board is not pushed through the switch section, and after the full stroke. The force to bend the substrate is absorbed by the deformation of the buffer member. Therefore, even if the push-in part of the knob pushes the switch part excessively due to the dimensional variation of each part, the force is mostly absorbed by the deformation of the cushioning member, and the board does not bend. The solder part provided on the board does not come off.

[0009]

【Example】

 An embodiment of the switch mechanism according to the present invention will be described below with reference to FIG. 1, in which the same parts as those in FIG.

FIG. 1 shows a switch mechanism. This switch mechanism includes a housing 1, a knob 3 that is mounted so as to be freely pushed into the housing 1, and a push portion 3 a of the knob 3 when the knob 3 is pushed. It is provided with a switch portion 5 that abuts and opens / closes a contact (not shown), and a stopper 7 that regulates the pushing dimension of the knob 3 so that an excessive load is not applied to the switch portion 5 when the knob 3 is pushed. There is.

The switch portion 5 is soldered 100 to the board 9, and the board 9 is fixed to the bottom of the housing 1 with screws 11. The board 9 is made of, for example, a paper-phenolic board having a copper foil attached to only one surface 9a, and the leads of the switch portion 5 penetrating the board 9 are soldered 100 to the one surface 9a.

Further, according to this embodiment, the cushioning member 13 made of an elastic member is adhered to the pushing portion 3a of the knob 3 described above.

The cushioning member 13 cushions the impact when the knob 3 is pushed in. When the knob 3 is pushed in fully, the contact point of the switch portion 5 makes a full stroke, and then the switch portion 5 is further inserted. It acts so as to absorb the force of bending the substrate 9 after the full stroke so that the substrate 9 is not pushed in.

In general, when the knob 3 is pushed in and the back surface of the knob 3 hits the stopper 7, it is desirable that the contact point of the switch unit 5 just make a full stroke. However, even if such dimensional control is performed in manufacturing, the dimensions of the parts vary, and as a result, the size of the switch 5 may be excessively pushed.

The above-mentioned cushioning member 13 is elastically deformed so as to absorb the dimensional variation of each component, and the cushioning member 13 does not apply a force greater than the force required for the deformation to the substrate 9. Acts like.

Therefore, according to this embodiment, even if the push-in portion 3a of the knob 3 pushes the switch portion 5 excessively due to the variation in the dimensions of the parts, the force is changed by the deformation of the cushioning member 13. Since it is almost absorbed, the substrate 9 does not bend and the solder portion 100 provided on the substrate 9 does not peel off.

Therefore, it is not necessary to use an expensive through-hole type substrate for the substrate 9, but a cheap paper phenol substrate or the like can be used, and a low-cost switch mechanism can be provided.

FIG. 2 shows another embodiment.

According to this, the knob 21 is coupled to the housing 22 by the hinge 23, and a part of the pushing portion 21a is manufactured by the cushioning member 25 having elasticity. 27 is a stopper. With this structure, even if the pushing portion 21a of the knob 21 pushes the switch portion 27 excessively due to dimensional variation of each component, most of the force is absorbed by the deformation of the buffer member 25. To be done. Therefore, since a force greater than the force required to deform the cushioning member 25 is not applied to the substrate 29, the substrate 29 does not bend and peeling occurs in the solder portion 100 as in the above-described embodiment. There is no.

Although various embodiments have been described above, it is obvious that the present invention is not limited to this. For example, in the above embodiment, the cushioning member is attached to the push-in portion of the knob, but this may be attached to the switch portion side.

Further, according to this, when tuning the operation feeling of the switch mechanism, it is possible to easily achieve it by changing the applied pressure-displacement characteristic of the buffer member.

[0022]

[Effect of device]

 As is apparent from the above description, according to the present invention, the switch operating force transmitted via the push-in portion of the knob is hardly transmitted to the board, so that the soldered portion of the board is not peeled off. Absent.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a switch mechanism according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment.

FIG. 3 is a cross-sectional view showing a conventional switch mechanism.

[Explanation of symbols]

 1 Housing 3 Knob 3a Push-in part 5 Switch part 7 Stopper 9 Board 13,25 Buffer member

Claims (1)

[Scope of utility model registration request] 1. A housing, a knob mounted so as to be freely pushed into the housing, a switch portion that abuts against a push-in portion of the knob to open and close a contact when the knob is pushed in, and a switch portion is excessively attached to the switch portion when the knob is pushed in. In a switch mechanism including a stopper that regulates the pushing dimension of the knob so that no excessive load is applied, a cushioning member for cushioning the impact when the knob is pushed is provided in the pushing portion of the knob or the switch portion. A switch mechanism characterized by that.