JPH0534084Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a variable resistor that is used by being attached to a mounting plate such as an insulating substrate and can be operated from both sides of the mounting plate.

[Prior art] Utility Model Application No. 58-191606 and Utility Model Application No. 53-164646
The publication discloses a variable resistor that can be operated from both sides of the insulating substrate while being attached to the insulating substrate.

The former publication discloses two types of variable resistors. The first variable resistor includes an auxiliary operating member (shaft) that is pivotally supported on the base body and has an operating section with a driver slot on the back side of the base body, and a drive plate that is press-fitted to the auxiliary operating member. It includes an operating member (knob) arranged on the surface side of the base. Further, the second variable resistor includes an operating member whose shaft portion is pivotally supported by a cylindrical conductive portion that penetrates the base body.
This operating member has a main operating section on the front side of the base, and an auxiliary operating section consisting of a driver slot at the end of the shaft located on the back side of the base.

The latter publication describes a disk-shaped part that is placed in a case provided on the front side of the board and to which a slider is attached, an operating member that protrudes from the top of the case, and a disc-shaped part that is pivotally supported on the board and that is attached to the back of the board. This figure shows a variable resistor equipped with a rotary member integrally formed with a shaft portion which is exposed to the side and has an auxiliary operation portion consisting of a dry bath slot at the exposed end thereof. The publication also describes an operating means in which the variable resistor is mounted on one side of an insulated circuit board, an operating section is provided on the other side of the insulated circuit board, and an operating shaft is pivotally supported on the insulated circuit board. This figure shows a specific usage mode in which a driver section provided at the tip of the operating shaft is fitted into a driver slot (auxiliary operating section) of the variable resistor to operate the variable resistor.

[Problems to be solved by the invention] The variable resistors shown in the above two publications can be operated from two directions, but the auxiliary operating member or the auxiliary operating part cannot be removed or the operating member is They are united. Therefore, depending on the application, if there is a request for changes such as increasing or decreasing the length of the auxiliary operating member, or changing the shape and dimensions of the driver slot, it can be changed according to each change request. I had to manufacture resistors. In addition, when soldering terminals by dip soldering or wave soldering, if the auxiliary operation member protrudes from the back side of the insulating board, the solder mask becomes troublesome, and the auxiliary operation member becomes an obstacle to soldering. There have been problems such as solder flux and solder adhering to the auxiliary operating member, making post-soldering processing cumbersome.

An object of the present invention is to provide a variable resistor that can solve the above problems.

[Means for Solving the Problems] The configuration of the present invention for solving the above problems will be explained below using FIGS. 1 to 3 corresponding to the embodiment. The variable resistor of the present invention includes an insulating substrate 1 on which a resistor is formed in a substantially circular arc shape, a slider 4 having a contact 42 that slides in contact with the insulating resistor, and An operating member 5 that is connected and rotates the slider with respect to the insulating substrate 1; and an auxiliary operating member that operates the operating member 5 from the side of the insulating substrate 1 opposite to the surface on which the operating member 5 is provided. A variable resistor comprising 6 is the subject of improvement.

In the variable resistor of the present invention, the operating member 5 includes a rotating shaft portion 5 rotatably supported with respect to the insulating substrate 1.
3 is provided, and the fitting shaft parts 61 and 62 of the auxiliary operation member 6 are fitted into the rotating shaft part 53.
2,55 are formed. Also, the auxiliary operation member 6
The fitting shaft portions 61 and 62 of the fitting hole 5 of the operating member 5
The fitting holes 52, 55 and the fitting shaft portions 61, 62 do not cause rotation between them, and the auxiliary operating member 6 is firmly supported by the operating member 5. Each has its own shape.

[Function of the invention] In the variable resistor of the invention, the fitting shaft portions 61 and 62 of the auxiliary operating member 6 fit into the fitting holes 52 and 5 of the operating member 5.
5, it is possible to easily meet requests for changing the length of the auxiliary operating member or the shape of the operating section (driver slot, etc.) by simply replacing the auxiliary operating member 6. Can be done. Furthermore, when soldering a variable resistor to an insulated circuit board by dip soldering or wave soldering, removing the auxiliary operating member 6 will prevent the auxiliary operating member from interfering with the soldering work. , and processing after soldering becomes easier. Furthermore, since the fitting shaft of the auxiliary operating member and the fitting hole of the operating member are shaped to prevent rotation between them, the fitting shaft of the auxiliary operating member and the fitting hole of the operating member are Even if the auxiliary operation member can be inserted and removed, there is an advantage that positioning of the auxiliary operation member and adjustment operation using the auxiliary operation member can be performed reliably. Furthermore, when using the variable resistor for applications that do not require the auxiliary operation member, the auxiliary operation member can be removed, and the range of uses of the variable resistor is widened.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings. 1 to 3, reference numeral 1 denotes an insulating substrate made of ceramic or the like, and a substantially arc-shaped (Ω-shaped) resistor (not shown) is formed on the surface of this substrate. A circular hole concentric with the arc of the resistor is formed through the inner substrate portion of the resistor. 2 is connected to the end of this resistor and the board 1
4 is a slider made of a conductive material with spring properties, and this slider is attached to a plate-shaped base 41.
A contact point 42 is provided at the tip of the arm extending from the resistor, and the contact point slides on the resistor. 3
is an intermediate terminal fitting fixed to the substrate 1 and connected to the slider 4.

The intermediate terminal fitting 3 has a plate-like portion 31 that comes into contact with the back surface of the substrate 1, and a terminal portion 32 that is bent from one end of the plate-like portion at a substantially right angle in a direction away from the substrate 1. A tubular portion 33 that also serves as a slider support means and a means for electrically connecting the intermediate terminal fitting 3 and the slider 4 is integrally formed approximately at the center of the plate portion 31. It is tightly fitted into a round hole provided in the substrate 1. The tip of the tubular portion 33 protruding from the surface of the substrate 1 is fitted into a mounting hole provided at the center of the base 41 of the slider 4, and the protruding tip is further bent outward to form a bent portion. 34 is formed. This bent portion 34 prevents the slider 4 from coming off from the tubular portion 33, and also allows the base 41 of the slider 4 to be placed at an appropriate level relative to the surface of the substrate 1 so that a predetermined rotational torque can be obtained. Being pressed down by force.

Reference numeral 5 denotes a substantially columnar operating member made of an insulating material and having a diameter that can cover the resistor forming portion of the insulating substrate 1. On the upper end side of this operating member 5, an operating rod fitting hole 51 with a hexagonal cross section is provided following the dish-shaped recess, and a through hole 5 with a rectangular cross section is provided following this hole 51.
2 is drilled in the axial direction. A tubular rotating shaft portion 53 that protrudes concentrically with the through hole 52 is provided on the lower end side of the operating member 5, and a large diameter through hole 55 that is continuous with the through hole 52 is formed inside the rotating shaft portion 53. has been done. These through holes 52 and 55 constitute a fitting hole into which a fitting shaft portion of an auxiliary operation member 6, which will be described later, is fitted. The rotating shaft portion 53 is rotatably fitted to the inner periphery of the tubular portion 33.
The end portion of the substrate 1 protruding toward the back surface side is heated and deformed radially outward and pressed against the surface of the plate-like portion 31 to form a deformed portion 53a, and the deformed portion 53a is
This prevents the rotating shaft portion 53 from coming off.
The operating member 5 also has a dustproof cover 54 that protrudes toward the substrate 1 at its peripheral edge, and a groove (not shown) formed in the operating member 5 inside the dustproof cover 54 is slidable. The tip of a protrusion (not shown) provided on the child 4 is engaged. This results in
The operating member 5 and the slider 4 are combined, and the operating member 5
The slider 4 rotates by the rotation of the slider 4.

Reference numeral 6 denotes an auxiliary operating member that is connected to the operating member 5 by being press-fitted from the lower end side of the operating member 5 into the fitting holes 52 and 55 of the operating member 5 so as to be insertable and removable. In this auxiliary operation member 6, a shaft portion 61 with a square cross section formed at one end side is fitted into the through hole 52, and a shaft portion 62 with a circular cross section formed following the shaft portion 61 is inserted into the through hole 55.
has been incorporated into. These shaft portions 61 and 62 constitute a fitting shaft portion. The auxiliary operating member 6 is also formed with an operating section 63 having a flange following the shaft 62, and the flange of the operating section is in contact with the deformed portion 53a of the rotating shaft 53. The operation portion 63 has a dish-shaped recess 63 provided on the end surface.
An operating rod insertion hole 63b having a rectangular cross section is provided following the hole 63b, and a groove 63c for inserting the cutting edge of the operating driver is provided in a part of the peripheral wall of the recess 63a.

The variable resistor of this embodiment having the above configuration is arranged so that the surface (or back surface) of a mounting plate such as an insulated circuit board (not shown) is located at the boundary line S-S shown in FIG. It is installed by fitting the terminal fittings 2 and 3 into the terminal fitting holes of the mounting plate. Note that a window having a diameter larger than the diameter of the operating portion 63 is provided in the mounting plate portion of the auxiliary operating member 6 that faces the operating portion 63 .

In the variable resistor of this embodiment mounted as described above, the tip of the operating rod having a predetermined hexagonal or quadrangular cross section is inserted into the hole 51 or 52 of the operating member 5 from the surface side of the mounting plate. By inserting and rotating the terminal fittings 2 and 3, the resistance value between the terminal fittings 2 and 3 changes. Also, from the back side of the mounting plate, the tip of the operation rod having a flat or square cross section can be inserted into the insertion groove 63c or the insertion hole 63b of the auxiliary operation member 6 and rotated, in the same manner as above. The resistance value between the terminal fittings 2 and 3 changes easily.

As described above, the operating member 5 in this embodiment has its rotating shaft portion 53 rotatably fitted into the inner periphery of the tubular portion 33 of the intermediate terminal fitting 3 that penetrates the substrate 1.
The end portion of the rotating shaft protruding from the tubular portion is deformed radially outward, and the deformed portion 53a is inserted into the intermediate terminal fitting 3.
By being pressed against the surface of the plate-like portion 31, the operating member 5 is brought into contact with the intermediate terminal fitting 3 with its rotating shaft portion 53 and deformed portion 53a, and is held in a favorable rotatable state. Thereby, the rotation operation of the operating member 5 is performed extremely smoothly.

The auxiliary operation member 6 described above may have a length in the axial direction of the operation portion 63 as required depending on the practical distance between the boundary line S-S in FIG. 1 and the substrate 1. This length may be made sufficiently long so that the rotation operation can be performed manually without using an operating rod.

The auxiliary operation member 6 is removably connected to the operation member 5, so if the resistance value variable operation only needs to be performed from one side of the mounting plate,
You can also remove it.

[Effects of the invention] As described above, according to the variable resistor of the invention, the fitting shaft portion of the auxiliary operating member is removably fitted into the fitting hole of the operating member, so that the auxiliary operating member cannot be replaced. With this, it is possible to easily meet requests for changing the length of the auxiliary operating member and the shape of the operating section. Furthermore, when soldering a variable resistor to an insulated circuit board by dip soldering or wave soldering, removing the auxiliary operating member 6 will prevent the auxiliary operating member from interfering with the soldering work. , and processing after soldering becomes easier. Furthermore, since the fitting shaft of the auxiliary operating member and the fitting hole of the operating member are shaped to prevent rotation between them, the fitting shaft of the auxiliary operating member and the fitting hole of the operating member are Even if the auxiliary operation member can be inserted and removed, there is an advantage that positioning of the auxiliary operation member and adjustment operation using the auxiliary operation member can be performed reliably. Furthermore, when used in applications that do not require an auxiliary operation member, the auxiliary operation member can be omitted, and the variable resistor has the advantage of having a wide range of uses.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a bottom view of the same embodiment, and FIG. 3 is a longitudinal sectional view of the same embodiment. DESCRIPTION OF SYMBOLS 1... Insulating substrate, 4... Slider, 5... Operating member, 6... Auxiliary operating member, 61, 62... Shaft portion.

Claims (1)

[Claims for Utility Model Registration] An insulating substrate on which a resistor is formed in a substantially arc shape, a slider having a contact that slides while contacting the resistor, and a slider connected to the slider. The slider includes an operating member that rotates the slider with respect to the insulating substrate, and an auxiliary operating member that operates the operating member from a side of the insulating substrate opposite to a side on which the operating member is provided. In the variable resistor, the operating member is provided with a rotating shaft portion rotatably supported with respect to the insulating substrate, and a fitting shaft portion of the auxiliary operating member is fitted into the rotating shaft portion. a fitting hole is formed, the fitting shaft of the auxiliary operating member is removably fitted into the fitting hole of the operating member, the fitting hole and the fitting shaft 1. A variable resistor, each having a shape that does not cause rotation between the two and allows the auxiliary operating member to be firmly supported by the operating member.