JP4488829B2 - Variable resistor - Google Patents

Description

  The present invention relates to a small variable resistor.

  A conventional small variable resistor has a cantilever-shaped clutch arm having a clutch groove formed at a predetermined interval on a rotor rotated by a shaft and an arc-shaped free end that engages with an engagement portion of a tip portion. The formed wiper is used.

For this reason, depending on the rotational direction of the rotor, either the tensile force or the compressive force is applied to the clutch arm as a resistance when the clutch groove and the engaging portion of the clutch arm are engaged. The clutch arm tends to get tangled with other parts at the time of assembling or transporting the parts, and there is a drawback that the working efficiency of the assembly is lowered.
Further, since the engagement between the clutch groove of the rotor and the engaging portion of the clutch arm uses the elastic force of the clutch arm protruding in an arc shape, the dimensions of the clutch arm must be processed with high accuracy, and the material of the wiper is also required. There is a disadvantage that a high elastic force must be used and the cost becomes high.
USP 5047746

  In view of the above-described conventional drawbacks, the present invention can make the load related to the engagement of the clutch groove of the rotor and the engaging portion of the wiper the same and smooth according to the rotational direction of the rotor, and the wiper of the wiper can be easily assembled. To provide a variable resistor that can efficiently prevent the engaging portion from being entangled with other parts, does not require processing with high dimensional accuracy, and can be designed without considering the elastic force of the engaging portion. It is aimed.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

  In order to achieve the above object, the present invention provides a variable resistor in which a wiper in which an engagement portion that engages with a clutch groove formed at a predetermined interval is formed in a rotor rotated by a shaft is housed in a housing. In the wiper at the portion corresponding to the clutch groove, two convex engaging portions that engage with the clutch groove are formed in the central portion on the opposite contact portion side so as to be the same pitch as or different from the clutch groove. Variable resistors.

  As will be apparent from the following description, the present invention has the following effects.

(1) In a variable resistor in which a wiper in which an engagement portion that engages with a clutch groove formed at a predetermined interval is formed in a rotor rotated by a shaft is housed in a housing, the portion corresponding to the clutch groove Since the two wiper-shaped engaging portions that engage with the clutch groove so as to have the same or different pitch as the clutch groove are formed in the central portion on the side opposite to the contact point, the rotational direction of the rotor differs. However, the resistance at the time of engagement between the clutch groove of the rotor and the engaging portion of the wiper is the same, and the operation can be performed smoothly.

(2) Because the engaging part of the wiper is formed in a convex shape by (1) above, it is entangled with other parts at the time of assembling or transporting parts, and the work efficiency of assembling is reduced. It is possible to prevent malfunctions such as causing

(3) According to the above (1), the elastic force of the engaging portion is not used when the clutch groove of the rotor and the engaging portion of the wiper are engaged, so that the dimensional accuracy of the engaging portion need not be processed with high accuracy. Well, it can be manufactured inexpensively.

(4) According to the above (1), since the elastic force at the time of engagement between the clutch groove of the rotor and the engaging portion of the wiper uses the elasticity of the contact portion of the wiper, the conventional clutch arm protruding in an arc shape is used. In comparison, it can be manufactured with an inexpensive material, and the cost can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

  In the first preferred embodiment for carrying out the present invention shown in FIG. 1 to FIG. 18, 1 is a small book having, for example, a vertical dimension of 3.2 mm, a horizontal dimension of 3.9 mm, and a height dimension of 3.9 mm. In the variable resistor of the present invention, the variable resistor 1 is rotatable about a housing 2 whose front surface is opened and a shaft 3 formed so as to protrude inwardly at the center of the inner bottom of the back plate 2a of the housing 2. The attached rotor 5 having a large number of clutch grooves 4 at a predetermined interval on the outer periphery of the front surface and the drive gear 6 on the outer periphery of the rotor 5 can be rotated forward and backward. A shaft 8 formed with a threaded portion 7 attached so as to be able to rotate and a bearing hole 10 having a diameter slightly larger than the diameter of the wiper support shaft 9 formed at the center of the tip of the rotor 5 were formed. Electrode side contact 1 1, a wiper 13 having resistance-side contacts 12, 12, 12, 12, and 12, and an electrode-side conductor 14 and resistance-side contacts 12, 12, 12, 12 that are in contact with the electrode-side contacts 11 and 11 of the wiper 13. , 12, a horseshoe-shaped resistor 15 and a substrate 16 provided with resistance-side conductors 15a, 15a connected to both ends of the horseshoe-shaped resistor 15, and an electrode-side conductor 14 of the substrate 16 at one end Is connected to the electrode-side terminal 17 positioned on the outer side of the rear central portion of the housing 2 and the resistance-side conductors 15a and 15a of the substrate 16, and the other end is Resistance-side terminals 18 and 18 positioned on the outer side near both front ends of the housing 2, a sealing cover 19 that covers the opening of the housing 2 in a sealed state, the shaft 8, the electrode-side terminals 17 and Resistance side It is constituted by an O-ring 20 and the sealing agent 21, 21, 21 for sealing between the child 18 and the housing 2.

As shown in FIGS. 6 to 9, the wiper 13 has a substantially rectangular plate-like wiper body 22 in which the bearing hole 10 is formed, and the housing integrally formed on one side of the wiper body 22. The upper surface of the central portion of the inner surface of the upper wall 2b of the upper wall 2b is bent into a substantially U-shape integrally formed with the stopper piece 24 that contacts the arcuate trapezoidal stopper portion 23 and the other end portion of the wiper body 22. Further, the electrode side contacts 11, 11 and the resistance side contacts 12, 12, 12, 12, 12, and a large number of clutch grooves 4 of the rotor 5 at a position near the center of one end of the wiper body 22, It is comprised by the two convex-shaped engaging parts 25 and 25 engaged with the clutch groove | channels 4 and 4 which were formed in the same pitch and separated by one.
In the embodiment for carrying out the present invention, the two convex-shaped engaging portions 25, 25 are bent into a V shape by forming the cut portions 26, 26 so that no gap is formed with the wiper body 22. Thus, the engaging portions 25, 25 are formed so that no elastic force is generated.

The variable resistor 1 having the above-described configuration has two convex portions in the rotor groove 5 and the clutch grooves 4 and 4 which are separated from the clutch grooves 4 of the rotor 5 by rotating the shaft 8 forward and backward. The wiper 13 engaged with the engaging portions 25, 25 is rotated integrally, and the resistance side contacts 12, 12, 12, 12, 12 of the wiper 13 and the horseshoe-shaped resistor 15 of the substrate 16 are The contact position changes, and the resistance value can be adjusted.
As shown in FIG. 15, when the shaft 8 is rotated forward / reversely, the stopper piece 24 of the wiper 13 comes into contact with the stopper portion 23 of the housing 2 and further rotated forward / reversely, the wiper body 22 is moved to FIGS. As shown, the two convex-shaped engaging portions 25, 25 are disengaged from the clutch grooves 4, 4 of the rotor 5, and the rotor 5 is idled.
During this clockwise or counterclockwise idling, the two convex engaging portions 25, 25 formed at the same pitch as the many clutch grooves 4 have the same resistance regardless of which direction they are rotated. Since the engagement and disengagement can be achieved, the operation can be performed smoothly.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 19 to 25 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIG. 19 to FIG. 21 is mainly different from the best first embodiment for carrying out the present invention in that it has two convex engagements. By using the wiper 13A in which the pitch of the portions 25 and 25 and the pitch of the clutch groove 4 of the rotor 5 are shifted by a half, using such a wiper 13A, the quarter pitch of the clutch groove 4 is obtained. When the shaft 8 is rotated in the reverse direction immediately after the engagement between the engagement portions 25 and 25 of the wiper 13A and the clutch groove 4 of the rotor 5 is released, the variable resistor 1A is engaged. Since the engagement between the convex engaging portions 25, 25 of the wiper 13A and the clutch groove 4 of the rotor 5 can be recovered, the response to the rotation of the shaft 8 when the wiper 13A is turned back in the rotational direction during idling. To improve , It is possible to obtain a better operation feeling.

  The third embodiment for carrying out the present invention shown in FIGS. 22 to 25 differs from the best first embodiment for carrying out the present invention mainly in the shape of two V-shaped convex portions. The variable resistor 1B configured using such a wiper 13B is the best first embodiment for carrying out the present invention in that the wiper 13B formed with the engaging portions 25A and 25A is used. In addition to the same operational effects, it is possible to more efficiently prevent entanglement from occurring during manufacture, transportation, assembly, etc. of the wiper.

  The present invention is utilized in the industry for manufacturing variable resistors.

The top view of the best 1st form for implementing this invention. The rear view of the best 1st form for implementing this invention. The side view of the best 1st form for implementing this invention. Sectional drawing which follows the 4-4 line | wire of FIG. Sectional drawing which follows the 5-5 line of FIG. The top view of the wiper of the best 1st form for implementing this invention. BRIEF DESCRIPTION OF THE DRAWINGS The front view of the wiper of the best 1st form for implementing this invention. The bottom view of the wiper of the 1st best form for implementing this invention. The side view of the wiper of the best 1st form for implementing this invention. BRIEF DESCRIPTION OF THE DRAWINGS The front view of the board | substrate of the best 1st form for implementing this invention. The rear view of the board | substrate of the best 1st form for implementing this invention. The top view of the engagement state of the engaging part of the wiper of the best 1st form for implementing this invention, and the clutch groove | channel of a rotor. The side view of the engagement state of the engaging part of the wiper of the best 1st form for implementing this invention, and the clutch groove | channel of a rotor. Sectional drawing which follows the 14-14 line | wire of FIG. BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the state which the stopper piece of the wiper of the best 1st form for implementing this invention and the stopper part of a housing contacted. The top view of the state which the engagement of the engaging part of the wiper of the best 1st form for implementing this invention and the clutch groove | channel of a rotor disengaged. The side view of the state which the engagement of the engagement part of the wiper of the best 1st form for implementing this invention and the clutch groove | channel of a rotor disengaged. The front view of the state which the engagement of the engaging part of the wiper of the best 1st form for implementing this invention and the clutch groove | channel of a rotor disengaged. Sectional drawing of the 2nd form for implementing this invention. The top view of the engagement state of the engaging part of the wiper of the 2nd form for implementing this invention, and the clutch groove | channel of a rotor. The side view of the engagement state of the engaging part of the wiper of the 2nd form and the clutch groove | channel of a rotor for implementing this invention. Sectional drawing of the 3rd form for implementing this invention. The top view of the wiper of the 3rd form for carrying out the present invention. The side view of the wiper of the 3rd form for carrying out the present invention. FIG. 25 is a sectional view taken along line 25-25 in FIG.

1, 1A, 1B: variable resistor, 2: housing,
3: shaft, 4: clutch groove,
5: Rotor, 6: Drive gear,
7: Screw part, 8: Shaft,
9: wiper support shaft, 10: bearing hole,
11: Electrode side contact, 12: Resistance side contact,
13, 13A, 13B: wiper, 14: electrode side conductor,
15: Horseshoe-shaped resistor, 16: Substrate,
17: Electrode side terminal, 18: Resistance side terminal,
19: Sealing cover, 20: O-ring,
21: Sealing agent 22: Wiper body
23: stopper part, 24: stopper piece,
25, 25A: convex-shaped engaging portion, 26: cutting portion.

Claims (1)

In a variable resistor in which a wiper in which an engagement portion that engages with a clutch groove formed at a predetermined interval is formed in a rotor rotated by a shaft is housed in a housing, the wiper at a portion corresponding to the clutch groove A variable resistor characterized in that two convex engaging portions that engage with the clutch groove are formed in the central portion on the side opposite to the contact point so as to have the same pitch as the clutch groove or a different pitch.

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