JPS6052563B2 - variable resistor - Google Patents

Description

[Detailed description of the invention] When the knob of the operating shaft is pressed, the operating shaft is inserted inside and stopped (this is called a push lock), and when the operating shaft is pushed again, it returns to its original state. This relates to a variable resistor that restores its original state (this is called push-lock release).

In recent years, audio equipment has become smaller and more sophisticated, and audio equipment (
As the front panels of tuners, amplifiers, etc. become smaller, the number of operating axes increases.

However, in this case, since the spacing between the operating axes is small, when one operating axis is moved, the operating axes on both sides tend to move simultaneously, resulting in a malfunction. The present invention has been made in view of the above points, and allows for predetermined adjustments by pushing locking all operating axes that are not in use, and releasing the push lock on only the operating axes that are used so that they protrude from the other operating axes. The present invention relates to a variable resistor as described above, and the present invention provides a variable resistor having the characteristics that the depth dimension can be reduced even when the push stroke of the operating shaft is large, the operating feel is good, and there are few malfunctions. below,
Embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of a variable resistor according to an embodiment of the present invention, FIG. 2 is a front cross-sectional view of the variable resistor, and FIG. 3 is an exploded perspective view of essential parts of the variable resistor.

Here, the part 2 on the right side of the boundary line 1 in FIGS. 1 and 2 is a variable resistance mechanism housing part having a normal configuration,
Further, the portion 3 on the left side of the boundary line 1 in FIGS. 1 and 2 and FIG. 3 show the locking mechanism storage portion which is a feature of the present invention.

First, the variable resistance mechanism storage section 2 will be described. Reference numeral 4 denotes a bearing, and an operating shaft 5 is fitted into the inner diameter portion of the bearing so as to be rotatable and slidable in the axial direction.

In addition, a resistor 7 is provided on the mounting plate 6, and the mounting plate 6 and the bearing 4
are joined by the engaging portion 8a of the case 8. A through hole is provided in the center of the brush mounting plate 10 on which the brush 9 is attached, which is in sliding contact with the resistor 7, and the operating shaft 5 is fitted into this through hole, so that the brush mounting plate 10 rotates in conjunction with the operating shaft 5. Configure it to do so. Next, the structure of the lock mechanism storage section 3 will be explained.

A housing 11 is attached to the case 8 of the variable resistance mechanism storage section 2 via an insulating plate 12, and a lock plate 13 is slidably mounted inside the housing 11. A groove 5a is formed at the tip of the operating shaft 5 and is fitted into a notch 13a provided on the lower side of the lock plate 13.
is rotatable within the notch 13a, and as the operating shaft 5 is pushed, the lock plate 13 slides within the housing 11 against the biasing force of the spring 14. This lock plate 13
The upper surface 13b is provided with a specially shaped uneven portion as will be described in detail later, and this uneven portion can be engaged with or disengaged from a protrusion 15a provided at the tip of the lock pin 15 disposed above the lock plate 13. This causes the variable resistor to have a lock function or a lock release mechanism. That is, a T-shaped protrusion consisting of a rotation holding part 15b and an engaging part 15c is provided on the upper surface of the lock pin 15, and this T-shaped protrusion is inserted into the through hole 1 of the cover plate 16 attached to the upper part of the housing 11.
6a, and the lock plate 13 is rotatably inserted and engaged with the lock pin 15. If it slides downward, lock pin 15
The protrusion 15a presses the upper surface 13b of the lock plate 13,
It is configured to engage with or disengage from an uneven portion provided on the upper surface 13b of the lock plate 13.

In order to enhance the pressing effect of the lock pin 15, a pressing leaf spring 17 may be interposed between the lock pin 15 and the cover plate 16. Next, the shape of the upper surface 13b of the lock plate 13 will be explained based on FIGS. 4 and 5 a to 5 c.

In Fig. 4, 13c is the side wall portion that projects upward, 13d, 13e and 13f are the second protruding V-shaped locking portions, triangular projections and trapezoidal projections, and 13g are the respective parts. A bottom part that is one step lower than 13d to 13f, 13h is a bottom part that is one step lower than bottom part 13g, 13
1 is an inclined part that smoothly connects the lower part 13h211 with the end of the V-shaped locking part 13d, and 13j is provided on the back surface of the V-shaped locking part 13d, and is a gap between the protruding part 15a8 of the lock pin 15 and the V-shaped locking part 13d. 13k is the guide side wall leading to the bottom part 13
A stepped portion 131 is formed at the boundary between the lock pin 15 and the lower portion 13h to prevent the lock pin 15 from moving backward.
5a to the upper surface of the lock plate 13. Note that the bottom surface portion 13g1, the lower portion 13h, and the inclined portion 131 form a passage for the protruding portion 15a of the lock pin 15. Further, to explain in detail the relationship between the unevenness on the upper surface 13b of the lock plate 13 using FIGS. 5a-c, FIG.
Figure Af) shows a longitudinal cross-sectional view of H-1-J-K-L,
Between H and J there is a gentle slope, there is a step at J, and between K and L a slope is formed again.

Furthermore, FIG. 5c shows a longitudinal cross-sectional view at AO) M-N-0-P-Q in FIG. It can be seen that there is a slope between 0 and P. The operation of the variable resistor having the above configuration will be explained.

First, as shown in FIG.
The tip moves the lock plate 13 to the left against the biasing force of the spring 14. Eventually, the upper surface 1 of the lock plate 13
3b comes into contact with the protrusion 15a of the lock pin 15. That is, in FIG. 4, the protrusion 15a of the lock pin 15 has moved from the position A away from the lock plate 13 to the position B at the open end 131.

Further, when the operating shaft 5 is pushed to move the lock plate 13 to the left, the protrusion 15a of the lock pin 15 is guided onto the passage 13g while being smoothly guided by the guide side wall 13j, and eventually reaches the side wall 13c. (position c),
The gap (position D) between the triangular convex portion 13e and the trapezoidal convex portion 13f is reached along this side wall portion 13c. At this point, the sliding movement of the operating shaft 5 is stopped, and when you release your finger from the operating knob at this point, the locking plate 13 attempts to return to the right side by the biasing force of the spring 14, and the V-shaped locking portion 13d It reaches the gap (position E), and in this state it is stopped by the V-shaped locking part 13d. Through the above process, the operating shaft 5 enters the inside of the variable resistor and is locked in an apparently shortened state. Note that in this state, even if the operating shaft 5 is rotated, the normal operation as a variable resistor can be performed. Next, in order to project the operating shaft 5 outward, the operating knob 5a may be pushed again.

Then, in FIG. 4, the protrusion 1 of the lock pin 15
5a falls from the bottom part 13g (position E) to the lower part 13h (position F) by the stepped part 13k, and when you release your finger from the operating knob in this state, the lock plate 13 is moved by the biasing force of the spring 14. It starts restoring, passes through the inclined part 131, and returns to the state before operation (position A). In the above embodiment, the lock pin 15 is made of an elastic molding material, so if an abnormal tensile force is applied in the locked state, the lock pin 15 will bend and the lock will be released, thereby preventing damage.

In this way, when the push operation is repeated, the above operation is repeated, and the push lock and push lock release are repeated.

When the protrusion 15a of the lock pin 15 separates from the lock plate 13, the position of the protrusion 15a becomes arbitrary. When the next push operation is performed, even if the initial position of the protrusion 15a is slightly shifted, the protrusion 15a can be moved to the open end 1 without causing a malfunction.
31 to the bottom surface 13g of the locking plate 13, and more reliably engage the gap (position E) of the V-shaped locking portion 13d. 13j is effectively utilized as a guide portion for the lock pin 15. Furthermore, the bottom surface portion 13g and the slope portion 131, which serve as a passage for the protrusion portion 15a, are formed by sloped surfaces to make the movement of the operating shaft 5 feel smooth. 13k is provided to prevent malfunction due to backward movement of the lock pin 15. 6A and 6b are plan views of a lock plate of a variable resistor in another embodiment of the present invention and H'-1''-J''- of the lock plate.
It is a sectional view taken along K''-L''.

In this embodiment, step portions are provided at 1'', J'', and K'', which has the effect of reliably preventing the protruding portion of the lock pin from moving backwards.According to the conventional configuration, the lock pin 1'', J'', and K'' are provided with stepped portions, respectively. The depth width 1 of the plate is increased, and the protrusion of the lock pin is made to slide on the top surface of the lock plate from the start of sliding of the lock pin (position U) to the locked state (position X), and the path of the protrusion of the lock pin is Since the entire structure (from position U to position Z) is made up of a completely hard-shaped groove 18, a lock plate with a very long depth and width is required for those with a long stroke of the operating shaft, which reduces the overall size of the variable resistor. had become extremely long.

In contrast, in the present invention, even when the sliding distance (stroke) of the operating shaft is long, the locking plate is used only for locking the operating shaft, so the depth and width of the locking plate can be shortened, compared to the conventional case. It is possible to obtain a variable resistor with a significantly smaller depth compared to the above. In addition, in the present invention, it is important that the lock pin and the lock plate can be engaged and disengaged smoothly and without malfunction, and as already described in the above embodiment, the guide side wall of the lock plate, This problem is solved by providing sloped portions and stepped portions at appropriate locations.

As explained above, the variable resistor of the present invention is free from malfunction, has a small depth, and has a good operational feel, and has extremely high practical value. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a variable resistor according to an embodiment of the present invention, FIG. 2 is a front cross-sectional view of the variable resistor, FIG. 3 is an exploded perspective view of a locking mechanism housing portion of the variable resistor, and FIG. Fig. 4 is a plan view of the lock plate sliding inside the lock mechanism storage section, Figs. A plan view and a vertical sectional view of a lock plate used in the variable resistor in the example, and FIG. 7 is a plan view of a lock plate used in a conventional variable resistor having a lock function. J2... Variable resistor storage section, 3... Lock mechanism storage section, 5... Operation axis, 11...
・・Casing, 13・・・Memorial board, 13b・・・・
・One side of the lock plate, 13d...V-shaped locking part, 1
3g, 13h, 131... Passage part (bottom part, low part, slope part), 13j... Guide side wall, 13k...
...Stepped portion, 131... Opening end, 15.
...Lock pin, 15a... Protrusion, 11.
...Press plate spring.

Claims (1)

[Scope of Claims] 1. A locking mechanism housing in which operating shafts with different sliding distances in the variable resistance mechanism storage section are provided rotatably and slidably in the axial direction, and the operating shafts are locked on the tip side of the operating shafts. In the variable resistor, a locking plate having a concavo-convex portion consisting of an open end, a V-shaped locking portion, and a passage portion is installed in the casing of the locking mechanism storage portion in the axial direction of the operating shaft. A lock pin is disposed so as to be interlocked with the sliding movement of the lock plate, and a lock pin that is rotatably movable and has a protrusion in a part of the housing is held in a position where it does not normally engage with the lock plate. The variable resistor is introduced into the passage portion from the open end of the lock plate during sliding, and is arranged so as to be able to engage with and disengage from the V-shaped locking portion. 2. The variable resistor according to claim 1, wherein a guide side wall is provided at the open end of one surface of the lock plate to guide the protruding portion of the lock pin to the V-shaped locking portion. 3. The variable resistor according to claim 1, wherein the passage provided on one surface of the lock plate is formed of an inclined surface, and the inclined surface is provided with a stepped portion for preventing the lock pin from moving backward. 4. The variable resistor according to claim 1, wherein the lock pin is made of an elastic molding material. 5. The variable resistor according to claim 1, wherein a pressing plate spring is provided on one side of the lock pin to increase the pressing force of the lock pin against the lock plate.