JPH0245935Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial field of application The present invention is a push button device applied to a switch, for example, and particularly a push button device having an opening at one end, with the opening facing toward a mounting panel. a guide tube that is attached to the mounting panel with a push button; a push button that is inserted into the guide tube through the opening and whose outer end projects outward through the button hole of the mounting panel; and a space between the guide tube and the push button. a return spring that is contracted to and springs the push button toward the opening;
The present invention relates to an improvement in which a shoulder portion is formed on the outer periphery of the push button to abut against the periphery of the button hole to restrict the return position of the push button.

(2) Conventional technology Conventionally, when attaching a guide tube to a mounting panel, a push button of a push spring placed in the guide tube is compressed, the shoulder of the push button is pressed with a finger, and the pushing button is released. The guide cylinder is pressed against the mounting panel by aligning the end with the buttonhole of the mounting panel.

(3) Problems that the invention aims to solve However, attaching the guide tube to the mounting panel by pressing the push button with your finger is not easy to install, and if your finger slips, the push button and return spring may be removed from the guide tube. There is a problem with it flying out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a push button device in which the above problem can be solved by temporarily fixing the push button to a guide tube.

B. Structure of the invention (1) Means for solving the problem The invention provides a projection on the outer peripheral surface of the push button.
Temporary grooves with which the protrusions engage are provided on the inner peripheral surface of the guide cylinder, and each of the temporary grooves has a narrow portion that opens in the opening and extends in the axial direction of the push button, and a narrow portion that opens in the opening and extends in the axial direction of the push button. and a wide part that extends in the axial direction of the push button, and a step that can support the protrusion and hold the push button in the return position at the boundary between the narrow part and the wide part. It is characterized by having a surface.

(2) Function The push button is temporarily fixed to the guide tube through the cooperation of its protrusion and the temporary fixing groove of the guide tube.

(3) Example The illustrated example is an application of the present invention to a switch.
In FIGS. 1 to 3, a switch Sw is attached to the inside of a switch panel P. The switch Sw includes a contact housing case 1 that houses a contact, and a button holder 2 that is superimposed on the contact housing case 1. A push button 3 is held therein, and the contacts in the contact storage case 1 are operated by the push button 3.

As shown in FIGS. 3 and 4, the contact storage case 1 includes a rectangular box-shaped main body 4, a lid 5 that covers the opening of the main body 4, and one outer side of the main body 4 and the lid 5. Attach the mounting brackets 6a at both ends to the main body 4.
It is made up of mounting members 6 that protrude to both sides, respectively. The mounting member 6 has a plurality of mounting pieces 6b that sandwich the main body 4 and the lid 5. When the lid 5 is fixed to the main body 4 with four rivets 7, two of the rivets 7 are attached. By inserting into piece 6b,
The mounting member 6 is integrally connected to the main body 4 and the lid 5. A screw hole 8 is formed in both bracket parts 6a.

Inside the main body 4, there are a plate-shaped movable contact 9 made of bimetal and a fixed contact 10 made of a normal conductor.
will be placed. This fixed contact 10 is fixed to a bent portion 11a of one connecting terminal 11 that passes through the main body 4. One end of the movable contact 9 is sandwiched between the protrusions 4a and 4b of the main body 4 together with the bent portion 12a of the other connecting terminal 12 that penetrates the main body 4, and the other end is connected to and separated from the fixed contact 10. Contact 10
It is placed opposite to. A toggle spring 13 made of a leaf spring is interposed between the end of the movable contact 9 beyond the fixed contact 10 and the main body 4.

The toggle spring 13 consists of an inverted U-shaped portion 13a that tends to open both legs, and a bent portion 13b connected to one of the legs.
3b is engaged with the notch 16 of the main body 4, and the tip of the leg piece is connected to the terminal of the movable contact 9.

The operating rod 14 for operating the movable contact 9 has a large diameter portion 14a and a small diameter portion 14b connected to one end of the large diameter portion 14a.
and a disk portion 14c provided at the end of the small diameter portion 14b. The large diameter portion 14a is loosely inserted into the notch 17 formed in the side wall of the main body 4 and the through hole 18 of the mounting member 6 and protrudes to the outside, and the small diameter portion 14b
is slidably inserted into a notch 19 formed in the shelf 4c in the main body 4. A spring 15 is compressed between the shelf portion 4c and the disk portion 14c, and the elastic force of the spring 15 keeps the disk portion 14c in constant contact with the movable contact 9.

As shown by the solid line in FIG. 3, when the movable contact 9 is bent into an arched shape by the opening force of the U-shaped portion 13a of the toggle spring 13 and is in contact with the movable contact 10, a constant current flows through the movable contact 9. Since both contacts 9 and 10 are maintained in the closed state during the operation, the operating rod 14 is held in the retracted position as shown by the solid line in FIG. 3 by the elastic force of the spring 15. On the other hand, when an overcurrent flows through the movable contact 9, the temperature of the movable contact 9 increases due to the current, and the movable contact 9 stretches linearly against the opening force of the U-shaped portion 13a. As a result, the toggle spring 13 swings clockwise as shown by the chain line in FIG.
The operating rod 14 is held in the protruding position as shown by the chain line in FIG.

In the button holder 2, a guide tube 2b having an opening at one end and for inserting the push button 3 is provided in the center of the flat surface of the substrate 2a, and a cylindrical guide tube 2b having screw insertion holes 20 at both ends. A spacer 2c is erected, and an operating rod guide tube 2d with both ends open is erected at the center of the inner bottom surface of the guide tube 2b.

A pair of temporary fixing grooves 21 are formed on the inner circumferential surface of the guide cylinder 2b, in the illustrated example, on the circumferential wall thereof, so as to face each other. The temporary fixing groove 21 has a narrow portion 2 that opens in the opening of the guide cylinder 2b and extends in the axial direction of the push button 3.
1a, and a wide portion 21e that is connected to the narrow portion 21a and further extends in the axial direction of the push button 3, and a stepped surface 22 is formed at the boundary between the narrow portion 21a and the wide portion 21b.

The push button 3 is molded into a stepped tube shape from transparent synthetic resin, and has a large diameter section 3a with an opening on one side with a shoulder section 23 on the outer periphery in between, and a large diameter section 3a with an opening on the other side. A small diameter portion 3b having a top wall 24 is provided as an end, and a pair of protrusions 3c are provided on the outer circumferential surface of the large diameter portion 3a in close proximity to the opening thereof. Protrudes symmetrically.

The circumferential width w ₁ of each protrusion 3c is the temporary fixing groove 21
The width is narrower than the width w ₂ of the narrow portion 21a (ie, w ₂ >w ₁ ), so that each protrusion 3c can be engaged with each temporary fixing groove 21.

Push the button 3 into the guide tube 2b of the button holder 2.
When temporarily fixing, insert the return spring 25 into this guide cylinder 2b, and touch the tip of the return spring 25 to the inner surface of the shoulder 23 of the push button 3, and insert each protrusion 3c into the narrow part of each temporary fixing groove 21. 21a, and insert the push button 3 into the guide tube 2b from its opening.
Then, the push button 3 with each protrusion 3c reaching each wide portion 21b is rotated counterclockwise in FIG. It is something to support. This keeps the push button 3 in its return position.

As clearly shown in FIG. 5, a plurality of engaging pawls (six in the illustrated example) are provided on the side edge of the substrate 2a of the button holder 2, protruding in a direction opposite to the guide tube 2b.
Among these engaging claws, four engaging claws 2e are arranged to face each other between the guide cylinder 2b and the spacers 2c on both sides thereof, and these engaging claws 2e
It is approximately perpendicular to the flat surface of a. The remaining two engaging claws 2f are arranged on the base periphery of both spacers 2c so as to face each other, and each engaging claw 2f is inclined at an acute angle with respect to the flat surface of the substrate 2a. .

When temporarily fixing the button holder 2 to the contact storage case 1, the operating rod 14 is loosely inserted into the guide tube 2d, the board 2a is overlapped with the mounting member 6, and the contact is accommodated using the four substantially right-angled engaging claws 2e. Both side surfaces of the case 1 are sandwiched, and two inclined engaging claws 2f are respectively engaged with the edges of both mounting bracket portions 6a.

With this structure, the movement of the button holder 2 in the front, back, left and right directions is restrained by the respective engaging claws 2e and 2f, and the button holder 2 is prevented from being externally stopped relative to the contact storage case 1 by the two inclined engaging claws 2f. As a result, the button holder 2 is correctly temporarily fixed to the contact storage case 1, and the screw insertion holes 20 of both spacers 2c in the button holder 2 match with the screw holes 8 of both mounting bracket parts 6a.

When attaching the switch Sw to a switch panel P, as shown in FIG. Then, both spacers 2c are brought into contact with the inner surface of the switch panel, so that the screw insertion holes 20 of each spacer 2c are aligned with the screw insertion holes 27 of the switch panel P. Then, the tightening screws 28 are passed through the screw insertion holes 27 and 20 from the outside of the switch panel P, and are screwed into the screw holes 8 of the mounting brackets 6a, respectively. In this case, the button holder 2 is temporarily attached to the contact housing case 1, the screw insertion hole 20 of the button holder 2 matches the screw hole 8 of the contact housing case 1, and the push button 3 is temporarily attached to the guide tube 2b. Since the push button 3 and the return spring 25 are not stopped and do not fly out from the guide tube 2b, the installation work of the switch Sw can be performed extremely easily.

Further, the periphery of the button hole 26 of the switch panel P is adapted to come into contact with the outer surface of the shoulder 23 when the push button 3 is in the return position, so that even if each protrusion 3c comes off from each stepped surface 22, The push button 3 does not protrude from the switch panel P.

In addition, when removing the switch Sw from the switch panel P, each protrusion 3c of the push button 3 is supported by each stepped surface 22 of the guide tube 2b, and the push button 3 is
and prevents the return spring 25 from popping out.

Both connection terminals 11 and 12 of the switch Sw are connected to a predetermined electric circuit (not shown).

In the above configuration, if a constant current flows through the electric circuit and therefore the movable contact 9, the third
As shown by the solid line in the figure, the movable contact 9 is in contact with the fixed contact 10, and the operating rod 14 is in the retracted position.

When some kind of failure occurs in the electric circuit and an overcurrent flows through the movable contact 9, the movable contact 9 separates from the fixed contact 10 as shown by the chain line in FIG. 3 as described above, so the electric circuit is opened and The operating rod 15 assumes the protruding position. The protruding state of the operating rod 14 is visible through the push button 3.

If you want to energize the circuit after repairing a fault in the electrical circuit, push the push button 3, and the tip of the operating rod 14 will be pushed in by the inner surface of the top wall 24 of the push button 3. The movable contact 9 is pushed and comes into contact with the movable contact 10 as shown by the solid line in FIG. 3, and an electric circuit is closed.

Note that three or more protrusions 3c of the push button 3 and three or more temporary fixing grooves 21 of the guide tube 2b may be provided.

C. Effects of the invention According to the invention, the push button can be temporarily fixed to the guide tube by supporting the protrusion of the push button on the stepped surface of the temporary fixing groove of the guide tube by both pushing and rotating the push button. The push button can be easily attached to the guide tube. Further, if the push button is temporarily fixed to the guide tube, the push button and the return spring will not fly out from the guide tube when the guide tube is attached to the mounting panel, and the work of attaching the guide tube can be carried out extremely easily.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a switch. Figure 1 is a front view of the switch installed on a mounting panel, Figure 2 is a bottom view of the switch, and Figure 3 is a bottom view of the switch.
The figures are a sectional view taken along the line of FIG. 1, FIG. 4 is an exploded perspective view of the switch, and FIG. 5 is a perspective view of the button holder seen from the back side. P...Switch panel as a mounting panel, 2
b...Guide tube, 3...Push button, 3c...Protrusion, 21...Temporary fixing groove, 21a...Narrow width part, 21
b... Wide portion, 23... End portion, 25... Return spring.

Claims (1)

[Scope of utility model registration request] a guide tube having an opening at one end and being attached to the mounting panel with the opening facing the mounting panel;
a push button that is inserted into the guide tube through the opening and whose outer end projects outward through the button hole of the mounting panel; and a push button that is compressed between the guide tube and the push button to allow the push button to and a return spring that springs toward the push button, and a shoulder portion is formed on the outer periphery of the push button to abut against the periphery of the button hole to regulate the return position of the push button. A protrusion is provided on the outer peripheral surface of the guide cylinder, and a temporary fixing groove in which the protrusion engages is provided on the inner circumferential surface of the guide cylinder, and the temporary fixing groove is
a narrow part opening in the opening and extending in the axial direction of the push button; and a wide part continuous with the narrow part and further extending in the axial direction of the push button, the narrow part and the wide part A push button device, characterized in that a stepped surface capable of supporting the protrusion and holding the push button at the return position is provided at a boundary portion of the push button device.