JPS5939388Y2 - Electrical parts with switches - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bush-type switch that is attached to an electrical component such as a variable resistor.

A button-on switch is attached to an electrical component that is operated by rotating a shaft, such as a variable resistor or a rotary switch, and the electrical component is operated appropriately by rotating the shaft, and the shaft is at any rotation angle. Mechanical components that turn on the switch by pressing the switch and return to the original state by releasing the pressure are widely used.

For example, the variable resistor section is used to adjust the volume and tone quality, and the button-on switch section is used for switching tracks on a recording tape or for muting.

One conventional example of this type of electrical component will be explained with reference to FIG.
Reference numeral A denotes an electrical component that can be rotated, and the shaft is rotatably and slidably fitted into a bearing 2, extends into the electrical component, penetrates the main body 3, and connects the tip 4 to the rear of the main body 3 (the first The insulating chip 5 is fixed to the tip thereof.

The configuration and operation of the rotary operation type electric component are equivalent to a known variable resistor or rotary switch,
A spring (not shown) of a known structure is provided inside the main body 3 to constantly bias the shaft 1 forward (rightward in FIG. 1).

B is a button-on switch fixed to the rear of the rotary operation part A by a known method, and inside the box-shaped case 6, a movable contact 8 that conducts with the external terminal 7 and a fixed contact 10 that conducts with the external terminal 9 face each other. The tip of the shaft penetrates into the case 6, and the insulating tip 5 is in contact with the movable contact 8.

The shaft 1 is normally biased forward, and by rotating it, the component A performs the function of a variable resistor or rotary switch under known operation and action.

Next, when the shaft is pushed backward against the above biasing force,
The insulating chip 5 moves the movable contact 8 to the fixed contact 10 side while keeping the function of the rotary operation part A at 1\, and the switch part B is turned on.

Next, when the pressure on the shaft 1 is released, the shaft returns to its original position due to the biasing force, and the movable contact 8 dissociates from the fixed contact 10, returning to the OFF state.

The above return force is generated by a spring (not shown) installed inside the bearing 2.
There are also examples.

In recent years, there has been a strong trend toward smaller electronic devices from the standpoint of design or resource conservation, and there is also a strong desire for improved tactility in order to respond to consumers' emphasis on feel.

Therefore, even for the above-mentioned rotary operation parts, it has been desired to have an area of 12 mm x 12 mm or less when viewed from the shaft side.

However, with the conventional structure, it is very difficult to easily configure it into the reduced shape described above due to the relationship between the strain and strain force of the elastic member of the switch, and in order to improve the feel of operation, new We needed something with a unique structure.

The present invention was devised to solve these problems.

Examples will be described below with reference to FIG. 2 and the following drawings.

This embodiment is an example in which the rotary operation component is a two-set opposed variable resistor.

2 is a side view, FIG. 3 is a sectional side view, and FIG. 4 is a partially exploded perspective view, where C is a variable resistor section and D is a switch section.

A front-stage resistance board 11 and a rear-stage resistance board 1 made of an insulator
Each of 1' has a resistor 12, 12' and a current collector 13, 13' on one side, and an external terminal 1 electrically connected to these.
4.14' is appropriately fixed by a conventionally known method.

The resistor board 11.11' is positioned as shown in FIG. 3, with the resistor-equipped surfaces facing both open ends of the rectangular cylindrical metal cover 15, and the metal mounting bracket 16 has its rear edge facing the front end. The metal connecting fitting 17 is located in front of and in contact with the resistance board 11 (toward the right in FIG. 3), and has connection legs 17a = 17a' for fixing the switch portion as described later, and is connected to the rear resistance board 11. A locking pawl 15a is located in contact with and behind the metal cover 11' (leftward in FIG. 3) and integrally extends from the opening of the metal cover 15 in the front and rear directions.

15a'... and 15b, 15b'... are the resistance board 11.11', the mounting bracket 16, and the connecting bracket 1.
7 are superimposed and fixed to each other as shown in FIG.

The mounting bracket 16 includes a bearing 19 that protrudes forward and holds the shaft 18 so as to be rotatable and movable back and forth, and a recess 20 opened toward the front-stage resistance board 11 is provided with a bearing 19 that holds the shaft 18 so as to be rotatable and movable back and forth. A stepped disc-shaped rotor 21 for regulating the angle within a predetermined range is rotatably housed.

The rotor 21 and the shaft 18 are engaged with each other so that they can rotate together and the shaft 18 can move back and forth.

The rotor 21 is provided with uneven grooves on its outer periphery, and if necessary, the rotor 21 can be articulated by bringing spring-biased balls into contact with the grooves.

The shaft 18 includes a collar 22 that contacts the bearing 19 and restricts its movement, and is rotatably and slidably fitted into the bearing 19, and further extends rearward to co-locate the rotor 21 at its center. The resistor body 12 is rotatably and slidably penetrated through the resistor board 11 and 11', and is housed between the resistor substrates 11 and 11'.
, the current collector 13, the resistor 12', and the current collector 13', after being rotatably and slidably penetrated through the center of the holding base 24 to which the sliders 23 and 23', which are in sliding contact with the current collector 13 and the current collector 13', respectively, are fixed. The tip portion 25 is made to protrude rearward of the variable resistance portion C.

The tip portion 25 is provided with an engagement groove 26 for driving the switch portion.

Next, the switch portion will be explained with reference to FIGS. 3 to 9.

FIG. 5 is a partially cutaway perspective view of the housing 30, FIG. 6 is a plan view thereof, and FIG. 7 is a punched-out plan view of the fixed contacts 31, 33.

The box-shaped casing 30 made of an insulating material has a first fixed contact 31 in the center on the bottom surface communicating with the first switch terminal 32, and a suitable contact point around the first fixed contact 31. A second fixed contact 33 is provided in communication with a second external terminal 34 at a distance, and a connecting groove 35. which receives the 1N17a, 17a' of the connecting fitting 17 is provided on the outer side of a pair of opposing walls.
35' in a direction perpendicular to the bottom surface, and guide grooves 38 and 38' for guiding snaps 1437 and 37' of a movable lid 36, which will be described later, are provided on the inside of the other opposing pair of walls, respectively, in a direction perpendicular to the bottom surface. In addition, engagement holes 39 and 39' are provided in communication with the guide grooves 38 and 38', and hook portions 4 at the tips of the snap legs 37 and 37' are provided as described later.
Accepts 0.40'.

The first fixed contact 31 has a plurality of protrusions 41, 41'...
(Two in the embodiment) are provided.

The metal cover 15 is provided on each external wall surface of the housing 30.
In order to avoid the bent portions of the locking claws 15b t 15b', cutouts of an appropriate shape are provided.

In this embodiment, it is necessary to provide the above-mentioned fixed contact with a reduced size switch of 12 x 12 mm or less, so as shown in FIG. , the external terminals 32 and 34 are connected to the closure band 42,
42' was punched out from a metal plate as a closed continuous body, and the housing 30 was molded so as to appropriately cover this part.

In Fig. 1, the part surrounded by the two-dot chain line indicates the part covered by the molding material of the casing in the plane forming the bottom surface of the casing. The line indicates a cutting line that is cut to separate both fixed contacts and both switch terminals after the above-described molding.

The movable lid 36 is made of an insulating material that is elastic and has a small coefficient of friction, and as shown in FIG. A pair of snap legs 37, 37' depend perpendicularly from the side edge, each having a hook 40.4 at its free end.
0', and a round hole 44 having a diameter smaller than the outer diameter of the tip end 25 of the shaft 18 but larger than the outer diameter of the groove 26, and a long hole 45 communicating with the round hole 44 in the center of the cover plate 43.
are formed in the direction of the pair of side edges, and an insulating band 46 having a width slightly narrower than the width of the elongated hole 45 is formed directly below the elongated hole 45.
are provided to bridge the snap legs 31°31'.

The insulating band 46 serves to reliably isolate and insulate the tip end of the rear shaft and the conductive portion of the switch during switch assembly, as well as reinforcing the snap legs 37 and 31' and providing appropriate elasticity thereto.

Further, the cover plate 43 has a thickness slightly smaller than the width of the groove 26 of the shaft.

Note that the effect of the long hole 45 communicating with the round hole 44 is that the round hole 4
The same effect can be obtained even if an elongated hole having a width of 4 mm is used instead.

The reversing contact 50 is made of a thin elastic conductive metal plate, and as shown in FIG. Reversibility is provided by providing a curved portion 52, further extending a pair of opposite sides with the same width, and bending the auxiliary legs 53, 53' toward the center of the curved portion into a shape that opens outward at an obtuse angle θ. It is preferable to use a spring plate and, if necessary, silver plate or silver clad to improve the contact resistance.

Next, to explain how to assemble the switch part, the reversing contact 50 is placed on the bottom of the housing 30 so that its auxiliary legs 53゜53' are in contact with the second fixed contact 33, and then it is movable so as to cover it. Push the lid 36 into the snap leg 37.37' using the guide groove 38.38' as a guide,
0.40' is elastically snapped into the engagement hole 39.39' to lock the movable lid 36 to the housing 30.

With this assembly, the reversing contact 50 abuts the lower surface of the insulating band 46 of the movable lid at the apex of its curved portion 52, and contacts the second fixed contact 33 at the auxiliary legs 53, 53'.

When the movable lid 36 is pressed, it is guided by the guide grooves 38 and 38' as shown in FIG. The lower surface of the insulating band 46 presses the apex of the contact 50, so that the reversing contact 50 is inverted.

Next, the switch part assembled as described above is stacked on the rear part of the variable resistor C, and the tip 25 of the protruding shaft is elastically snapped into the round hole 44 of the cover plate 43 to form a groove in the shaft. 26 and the round hole 44, the connecting leg 17a of the connecting fitting 11,
17a' into the connecting grooves 35 and 35' of the housing 30, bend the ends of the connecting legs 17a and 17a' and fix the switch part to the variable resistor C, and complete the assembly. complete.

Next, the operation will be explained.

In the first state where the shut 18 is not pressed, the reversing contact 5
0 through the movable lid 36 and is in the state shown in FIG. 3, and by rotating this, the variable resistor can be adjusted.

Next, when the shutter 18 is pressed to a second state (not shown), the collar 22 moves rearward until it comes into contact with the bearing 19, and therefore the movable lid 36 that engages with the shaft groove 26 moves rearward. Then, the insulating band 46 presses the apex of the curved portion 52 of the reversing contact 50 to reverse the curve backward, and the inverted curved portion 52 connects to the protrusion 41 of the first fixed contact 31 as shown in FIG. .41', auxiliary legs 53, 53
' is in contact with the second fixed contact 33, so the switch terminals 32 and 34 are short-circuited and the switch is closed and turned on.

Next, when the pressure on the shaft 18 is released, the reversing contact 50 is no longer pressed, so it is reversed and returns from the state shown in FIG. 10 to the normal state shown in FIG. 9, and the circuit between the fixed contacts 31 and 33 is opened. This return force causes the shaft 18 to move forward via the movable lid 36 and return to the first state shown in FIG. 3.

Since the present invention is configured as described above, it has the following effects.

(1) Since the reversing contact 50 is formed from the base plate 51 and the auxiliary legs 53.53', (a) the bending angle θ of the auxiliary legs 53, 53', the width d (Fig. 9), and the housing. 30 inner surface d' (first
By changing the dimensional difference from Figure 0), the force for reversing the reversing contact and its restoring force can be appropriately changed to easily create soft-touch and strong-touch types.

(b) Conventional circular inverted spring plate (for example,
- As described in Publication No. 51811), it is difficult to use the reversing spring directly as a movable contact because there is a risk that its periphery may float when the pressure is reversed, and it is necessary to provide a separate movable contact. However, in the present invention, the reversing spring can be used directly as a movable contact.

(2) The movable cover 36 can be easily and securely attached to the switch housing 3.
Since it can be directly assembled by snap-in to 0, it is possible to reduce the number of parts and the depth.

(3) Also, the insulating band 46 of the movable lid compensates for the elastic force of the snap legs 37 and 37', which decreases due to miniaturization, and
Insulating isolation between the shaft 18 and the conductive part of the switch can be ensured.

(4) Since the first fixed contact 31, the second fixed contact 33, and the terminals that conduct with them are on the same plane (bottom of the casing), from one flat metal plate as shown in FIG. It can be made by punching, which reduces the number of man-hours for manufacturing and managing parts, and also reduces the depth dimension.

(5) After assembling the switch part, there is no wobbling because the reversing contact housed inside the housing and the movable lid are in pressure contact with each other, so only the switch part can be mass-produced and stored as a semi-finished product, and can be replaced as needed. By assembling it into an electronic component that is rotated, it is possible to reduce costs, and in this case, the lid plate 4 of the movable lid
3 covers the opening of the casing, which prevents dust from entering when the product is stored as a semi-finished product.

[Brief explanation of drawings]

Figure 1 is a side view showing the main part of the conventional example with some parts cut away;
10 to 10 relate to an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a sectional view, FIG. 4 is a partially exploded perspective view, and FIG. 5 is a side wall of the casing. Fig. 6 is a plan view of the housing, Fig. 7 is a cutout plan view when the fixed contacts and terminals are formed from the same metal plate, and Fig. 8 is a movable case. FIG. 9 is a plan view and a TT sectional view of the reversing contact, and FIG. 10 is a sectional view for explaining the state in which the reversing contact is pressed and reversed. 18: shaft, 25: shaft tip, 26: shaft engagement groove, 30: housing, 31: first fixed contact, 32
: first switch terminal, 33: second fixed contact, 34:
Second switch terminal, 36: Movable lid, 37.37'
Nice snap leg, 4"0. 40': Key part, 43: Lid plate, 44: Round hole, 45:
Long hole, 46: Insulating band, 50: Reversing contact, 51: Plywood, 52: Spherical curved part, 53.53': Auxiliary leg, C:
Variable resistor section, D: switch section.

Claims (1)

[Claim for Utility Model Registration] In an electrical component with a switch, in which a switch operated by pressing the shaft is attached to the rear of the electrical component operated by a rotating shaft, the circumference of the tip of the shaft extending into the interior of the switch. An engaging groove is provided in the bottom of the housing, and the switch is made of a box-shaped housing made of an insulating material, the opening of which is in contact with the rear part of the electrical component, and a flat plate-shaped housing provided on the bottom of the housing that protrudes to the outside of the housing. A first fixed contact communicating with the switch terminal on the same plane and a second fixed contact surrounding it, and a cover plate made of elastic synthetic resin and covering the inside of the opening of the casing with a slight gap between them. □A pair of snap legs that are integrally formed rearward from the periphery of the body and have a hook portion at the tip; □An insulator that is housed in the body so as to be able to move back and forth, and that is integrally formed so as to bridge the middle of each snap leg. a band, and a long hole formed in a front facing portion of the insulating band that receives the engagement groove of the shaft with a snap fit to rotatably hold the shaft, or a round hole communicating with the long hole; and a pair of auxiliary legs that hang backward at an obtuse angle from the opposite side of plywood made of elastic thin metal sheet and have a dome-shaped curved portion convexly formed forward, and are in constant contact with the second fixed contact. The apex of the curved portion contacts the rear surface of the insulating band of the movable lid, and when the shaft is pressed, it is reversed to short-circuit the first and second fixed contacts, and when the pressure is released, it returns to its original position. An electrical component with a switch consisting of a reversing contact placed between the insulating band of the movable lid and the bottom surface of the casing so that the shaft returns to its original position via the movable lid using the returning force.