JPH0419693Y2 - - Google Patents

Description

[Detailed description of the invention] ``Purpose of the invention'' (Industrial application field) The present invention relates to a mounting structure for push knobs placed on the panel surface of electrical equipment, and aims to reduce the number of parts and facilitate installation. This relates to the mounting structure of the knob.

(Prior Art) Conventionally, the mounting structure of a knob for pressing a push switch placed on the back side of a panel in electrical equipment is as shown in Figures 7A, B and 8.
The configuration shown in Figures A and B was adopted.

In Figures 7 and 8, Figure A is a cross-sectional view, and Figure B is a cross-sectional view.
The figure shows a longitudinal cross-sectional view, where S is a push switch arranged on the mounting board P on the back side of the panel 11, and B1 and B2 are electrical components. Knob 1 to be placed in the knob window 12 formed on the panel 11
4, in the configuration shown in FIG. 7, support legs 15 are formed on both sides of the knob 14, and these support legs 15 are made to protrude toward the rear side from holes 13b formed in the back wall 13 of the knob window 12. At the same time, an engaging claw 15a formed at the tip of the support leg 15 is engaged with the rear side of the back wall 13, and the knob 1
The switch S is operated by pressing an operating shaft 16 projecting from a shaft hole 13a provided in the back wall 13. 17 is knob 14
This is a coil spring inserted between the back surface and the back wall 13.

In the configuration shown in FIG. 8, the knob 14 is simply formed in a substantially "T" shape, and the operating shaft 16 is inserted into a shaft hole 13a formed in the back wall 13.
The coil spring 17 is inserted between the plane of the back wall 13 and a retaining ring 18 disposed at the rear end of the operating shaft 16, and is configured to constantly press the head of the operating shaft 16 against the operating section of the switch S. and
The other configurations are the same as in FIG. 7.

(Problems to be Solved by the Invention) However, among the conventional knob mounting structures described above, in the one shown in FIG. Since the electric parts B1 and B2 and the structure are involved, there are limitations on the arrangement of the parts, the shape of the structure, the size of the knobs, etc.

Furthermore, in the case shown in FIG. 8, when assembling the knob, it is necessary to fit the retaining ring 18 onto the operating shaft 16 while compressing the coil spring 17, which makes the assembly work extremely troublesome, which increases the assembly cost, etc. There were some shortcomings.

The above-mentioned drawbacks of the conventional structure are particularly disadvantageous as a knob mounting structure for miniaturized equipment.

"Structure of the invention" (Means for solving the problem) The knob mounting structure according to the invention is placed on the panel surface of an electrical device, and is placed on the back side by pressing against a spring. In the mounting structure of the knob that operates the push switch, the tip of the operating shaft that protrudes rearward from the synthetic resin knob has a protrusion in the normal direction of the shaft, and the knob window formed in the panel allows the knob to A shaft hole is formed in the back wall of the knob window to allow the operating shaft to pass therethrough, and the mouth edge of the shaft hole has a shape corresponding to the projection. Moreover, by forcibly inserting the operating shaft in a twisted state, an engagement hole is formed through which the protrusion can pass, and when the operating shaft is twisted back after passing the protrusion, the protrusion is pushed to the rear side of the inner wall. The operating shaft is configured to prevent the operating shaft from slipping out of the shaft hole even if the knob is engaged with and swings within the clearance.

As a means for allowing the protrusion to pass through the engagement hole when the operation shaft is inserted in a twisted state, the engagement hole is formed at a position shifted from the protrusion, and the knob is tilted. The protrusion can be inserted into the engagement hole, and the knob can be inserted into the knob window with the knob returned to its normal position.

In addition, as another means, an engagement hole is formed at a position corresponding to the protrusion, a guide cam part is formed on the side wall of the engagement hole, and the operating shaft is inserted straightly, so that the operating shaft is inserted into the guide cam part. can be made to pass through the protrusion while being forcibly twisted.

(Function) When installing the knob, insert the tip of the operating shaft and the protrusion so that they correspond to the shaft hole formed in the back wall of the knob window of the panel and the engagement hole on the edge of the shaft hole. In this case, if the engagement hole is formed at a position offset from the protrusion, insert the protrusion into the engagement hole with the knob slightly tilted, return the knob to the normal position, and insert the knob into the knob window. mated,
In this state, push in the entire knob. This puts the operating shaft in a twisted state, and after the protrusion passes through the engagement hole, it returns to its original state and the protrusion engages with the back side of the back wall. Further, if a configuration is adopted in which the engagement hole is formed at a position corresponding to the protrusion and a guide cam is formed on the side wall of the engagement hole, the knob may be pushed in as it is. As a result, the projection is guided by the guide cam portion, so the operating shaft is twisted, and after the projection passes through the engagement hole, it returns to its original state and the projection engages with the back side of the rear wall.

As a spring means to always press the knob forward, a coil spring may be placed between the back side of the knob and the back wall as in the conventional case, and if possible, a coil spring may be placed between the back side of the knob and the back wall. By bringing the switch into contact with the operating section of the switch, the spring means inside the switch can be utilized.

(Example) The first example of the knob mounting structure according to the present invention is
Explanation will be given based on Figures 6 to 6. Figure 1 is a cross-sectional view showing the state in which the knob is installed, Figure 2 is a longitudinal sectional view, Figure 3 is a perspective view of the knob, and Figure 4 is the operating shaft of the knob. 5 is a front view showing the relationship between the operating shaft and the protrusion provided thereon, and the shaft hole and engagement hole formed in the back wall of the knob window, and FIGS. 6A and B are the engagement An example is shown in which a guide cam is provided on the side wall of the hole, and A
The figure is a front view, and figure B is a sectional view.

In the figure, S is a push switch arranged on the mounting board P on the back side of the panel 1,
It is operated by pressing a knob 4 arranged in a knob window 2 provided on the panel 1. B1, B2
are other electrical components arranged on the mounting board P.

The knob 4 is made of synthetic resin, and has an operating shaft 5 protruding from the rear thereof.The operating shaft 5 has a protrusion 6 symmetrical in the normal direction of the shaft at its tip.
The knob window 2 is formed in a shape that substantially corresponds to the knob with enough clearance for the knob to move in and out, and the operating shaft 5 is provided on the back wall 3 of the knob window 2
A shaft hole 7 is formed through which the shaft hole 7 is inserted, and the shaft hole 7 has a shape corresponding to the projection 6, and the projection 6 passes through the opening of the shaft hole 7 by inserting the operating shaft 5 in a twisted state. An engagement hole 8 is formed so that the operation shaft 5 is twisted back after passing the projection, and the projection 6 engages with the rear surface 1a side of the inner wall 3, and the knob 4 swings within the clearance. Also the above operation axis 5
The structure is such that it does not come out of the shaft hole 7.

As a means for allowing the protrusion to pass through the engagement hole when the operation shaft 5 is inserted in a twisted state, in the examples shown in FIGS. 1 to 5, the engagement hole 8 is different from the protrusion 6. They are formed at different positions, that is, at an angle α in the direction of rotation of the shaft. When attaching the knob, the projection 6 is inserted into the engagement hole 8 with the knob 4 tilted, and in this state, the knob is returned to its normal position and pushed into the knob window 2. The operating shaft 5 is twisted when returning the knob 4 to its normal position, but when the protrusion 6 passes through the engagement hole 8, the operating shaft is untwisted and the protrusion 6 engages with the back surface 1a of the back wall 3, and the knob is rotated. is prevented from slipping out. Note that the knob window 2 has a clearance that allows the knob 4 to move in and out properly, and therefore the knob 4 can swing slightly around the operating shaft. 4 should be set to be smaller than the displacement angle α of the engagement hole 8.

As a means for allowing the protrusion 6 to pass through the engagement hole 8 when the operation shaft 5 is inserted in a twisted state, in the configuration example shown in FIG. the engagement hole 8.
A guide cam portion 9 is formed on the side wall of the shaft, and by inserting the operating shaft 5 in a straight line, the guide cam portion 9 forcibly twists the operating shaft 5 to pass through the engagement hole 8.

If possible, the spring means inside the switch can be used to bias the knob 4 so as to press it forward at all times by bringing the tip end of the operating shaft 5 into contact with the operating section of the switch S. However, in this embodiment, the coil spring 10 is disposed between the back side of the knob 4 and the back wall 3 as in the conventional case. Therefore, during assembly, the knob must be pushed in with the coil spring 10 inserted into the operating shaft 5.

"Effect of the invention" According to the knob mounting structure according to the invention, when installing the knob, the protrusion formed at the tip of the operating shaft is inserted into the engagement hole of the shaft hole opening formed on the back wall of the knob window. It can be easily installed by simply pushing the knob into the knob window in this state, or by tilting the knob, inserting the protrusion into the engagement hole, returning the knob to the normal position, and pushing it into the knob window in this state. It has a simple structure and is extremely easy to install. This eliminates the need for conventional retaining rings and other parts, significantly reducing assembly costs, and ensures that the attached knob not only operates properly but also prevents it from hitting other electrical parts. There is no risk of this type of knob being attached, making it an optimal mounting structure for this type of knob.

[Brief explanation of drawings]

1 to 6 show an embodiment of the knob mounting structure according to the present invention, FIG. 1 is a cross-sectional view showing the state in which the knob is attached, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a perspective view of the knob. Figure 4 is a sectional view of the operating shaft of the knob.
Figure 5 is a front view showing the relationship between the operating shaft and the protrusion provided thereon, and the shaft hole and engagement hole formed in the back wall of the knob window, and Figures 6A and B are the side walls of the engagement hole. An example in which a guide cam is provided is shown, and Figure A is a front view and Figure B is a sectional view. Figure 7 A, B and Figure 8 A, B
1 shows a conventional knob mounting structure, and in FIGS. 7 and 8, A is a cross-sectional view, and B is a longitudinal cross-sectional view. S...Push switch, 1...Panel, 2...
...Knob window, 3...Back wall, 4...Knob, 5...
Operation shaft, 6...Protrusion, 7...Shaft hole, 8...Engagement hole, 9...Guide cam portion.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In the mounting structure of a knob that is placed on the panel surface of an electrical device and operates a push switch placed on the back side by pressing against a spring, the knob is made of synthetic resin. A protrusion is formed on the tip of the operating shaft that protrudes rearward from the panel in the normal direction of the shaft, and a knob window formed in the panel is formed with enough clearance for the knob to come out and exit. A shaft hole for inserting the operating shaft is formed in the back wall of the shaft hole, and the opening of the shaft hole has a shape corresponding to the projection, and the operating shaft is inserted in a forcibly twisted state. As a result, an engagement hole is formed through which the protrusion can pass, and when the operating shaft is twisted back after passing the protrusion, the protrusion engages with the rear side of the inner wall, and the knob swings within the clearance. The knob mounting structure is characterized in that the operating shaft is configured to prevent the operating shaft from slipping out of the shaft hole even if the operating shaft is moved. 2 In order to allow the protrusion to pass through the engagement hole by inserting the operating shaft in a twisted state, the engagement hole is misaligned with the protrusion, and the clearance is the angle at which the knob can swing. The knob mounting structure according to claim 1, wherein the knob mounting structure is set to be smaller than the positional deviation angle of the engagement hole with respect to the projection. 3. In order to allow the protrusion to pass through the engagement hole by inserting the operating shaft in a twisted state, the side wall of the engagement hole is provided with a mechanism to forcibly twist the operating shaft by guiding the protrusion. The knob mounting structure according to claim 1, characterized in that a guide cam portion having a shape of 100 mm is formed.