Electrical resistors – Mechanically variable – Movable contact electrically adjustable over length of...
Reexamination Certificate
1999-05-06
2001-12-11
Easthom, Karl D. (Department: 2832)
Electrical resistors
Mechanically variable
Movable contact electrically adjustable over length of...
C338S132000, C338S134000, C200S0050EA, C200S014000, C200S0110TC
Reexamination Certificate
active
06329898
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multiple operation type electrical part suitable for use in operating, for example, a car stereo.
2. Description of the Related Art
A description will now be given of a conventional multiple operation type electrical part with reference to FIG.
30
. The bearing
51
comprises an axial portion
51
b
, with a through hole
51
a
formed therein, and a flange
51
c
. A cylindrical outer shaft
52
is rotatably mounted in the through hole
51
a
of the bearing
51
.
The cylindrical sleeve
53
, fitted to the rear side of the outer shaft
52
, is affixed to the outer shaft
52
by caulking the sleeve
53
from the outer side thereof.
The case
54
, which is a zinc die-casting or the like, has a recess
54
a
having accommodated therein a self-returning coil spring
55
. With the arm portion
55
a
retained by the side wall of the case
54
, the coil spring
55
is mounted to the case
54
.
The case
54
, having the coil spring
55
mounted thereto, is disposed on the rear side of the flange
51
c
of the bearing
51
. When the case
54
is disposed in this manner, the sleeve
53
is disposed so as to be placed within the wound portion
55
b
of the coil spring
55
.
Clockwise or counterclockwise rotation of the outer shaft
52
causes rotation of the sleeve
53
.
The rotation of the sleeve
53
causes movement of one of the arms
55
a
of the coil spring
55
in opposition to the resiliency of the arm
55
a.
When the outer shaft
52
is released so that rotational force is longer applied thereto, the springy arm
55
a
, which has been moved, bumps into the side wall of the case
54
due to its resiliency, whereby the outer shaft
52
and the sleeve
53
rotate until they return to their original positions and stop there. Accordingly, the outer shaft
52
and the sleeve
53
are self-returning component parts capable of returning to their original positions by themselves.
A sliding member
57
, formed of a springy metallic plate, is mounted to a rotary member
56
, which is a molded product of synthetic resin. With the sleeve
53
fitted into a hole at the center portion of the rotary member
56
, the rotary member
56
is mounted on the rear side of the case
54
, so that it rotates as the sleeve
53
rotates.
The case
58
, which is a molded product of synthetic resin, has a recess
58
a
. A contact member
59
is embedded in the case
58
so as to be exposed at the bottom portion of the recess
58
a.
With the rotary member
56
accommodated in the recess
58
a
, the case
58
is disposed on the rear side of the case
54
.
When the case
58
is disposed in this manner, the sliding member
57
can come into contact with and separate from the contact member
59
. When the rotary member
56
rotates as a result of the rotation of the outer shaft
52
, the sliding member
57
rotates in order to come into contact with or separate from the contact member
59
, whereby a switching operation takes place.
The rotary member
56
, having the sliding member
57
mounted thereto, and the case
58
, having the contact member
59
mounted thereto, form a first rotary electrical part D
4
.
The inner shaft
60
is inserted into a hole of the outer shaft
52
in such a manner as to protrude from the rear side of the case
58
, and is mounted in the hole so as to be rotatable and axially movable.
The case
61
, which is a molded product of synthetic resin, has a bottom wall
61
a
, being a recessed portion, and a bumpy portion
61
b
, formed at the bottom wall
61
a
. With the inner shaft
60
inserted in a hole of the case
61
, the case
61
is disposed on the rear side of the case
58
.
The rotary member
62
, which is a molded product of synthetic resin, has an axial portion
62
a
and a flange
62
b
. A clicking member
63
, formed of a spring plate, is mounted at the front side of the flange
62
b
of the rotary member
62
.
The case
64
, which is a molded product of synthetic resin, has a recess
64
a
, at the center portion thereof, and a hole
64
b
, connected to the recess
64
a
. With the rotary member
62
accommodated in the recess
64
a
, the axial portion
62
a
of the rotary member
62
is fitted to the hole
64
b
, whereby the rotary member
62
is rotatably supported by the case
64
.
With the rotary member
62
being inserted in the case
64
and the inner shaft
60
of the rotary member
62
being joined to the axial portion
62
a
of the rotary member
62
through splines, the case
64
is disposed on the rear side of the case
61
.
When the case
64
is disposed in this manner, the clicking member
63
can engage and disengage the bumpy portion
61
b
of the case
61
. Rotation of the inner shaft
60
causes rotation of the rotary member
62
. This causes the clicking member
63
to engage and disengage the bumpy portion
61
b
in order to provide a tactile feel when the inner shaft
60
is rotated.
The case
61
, the rotary member
62
, having the clicking member
63
mounted thereto, and the case
64
form a click mechanism K.
The rotary member
65
, which is a molded product of synthetic resin, has an axial portion
65
a
and a flange
65
b
, with a movable contact
66
being embedded in and mounted to the flange
65
b.
The case
67
, which is a molded product of synthetic resin, has a hole
67
a
and a recess
67
b
, with a sliding member
68
, formed of a springy metallic plate, being embedded in and mounted to the case
67
.
With the rotary member
65
being accommodated in the recess
67
b
, the axial portion
65
a
of the rotary member
65
is fitted into the hole
67
a
, whereby the rotary member
65
is rotatably supported by the case
67
.
With the rotary member
65
being inserted in the case
67
and the inner shaft
60
being joined to the axial portion
65
a
of the rotary member
65
through splines, the case
67
is disposed on the rear side of the case
64
.
When the case
67
is disposed on the rear side of the case
64
, the sliding member
68
can come into contact with and separate from the movable contact
66
. Rotation of the rotary member
65
as a result of the rotation of the inner shaft
60
causes the movable contact
66
to rotate and come into contact with and separate from the sliding member
68
, whereby switching operations are performed.
The rotary member
65
, to which the movable contact
66
is mounted, and the case
67
, to which the sliding member
68
is mounted, form a second rotary electrical part D
5
.
With the inner shaft
60
being inserted in a hole formed in the center portion of an insulating plate
69
, the insulating plate
69
, formed of insulating material, is disposed on the rear side of the case
67
.
A dislodgment preventing plate
70
is mounted to the inner shaft
60
, projecting from the rear side of the insulating plate
69
, in order to prevent the inner shaft
60
from being dislodged towards the front.
An actuating member
72
is mounted to the fixed member
71
, being a molded product of synthetic resin. With the actuating member
62
being in contact with one end of the inner shaft
60
, the fixed member
71
is fitted to the protrusion and the recess of the case
67
so as to be disposed on the rear side of the case
67
.
The case
73
, which is a molded product of synthetic resin, has a recess
73
a
and a bottom wall
73
b
, with contact members
74
and
75
, exposed at the bottom wall
73
b
, being embedded in and mounted to the case
73
.
The movable contact
76
, formed of a springy metallic plate, is dish-like in shape and has a concavely formed center portion. It is accommodated in the recess
73
a
of the case
73
. The center portion of the movable contact
76
is separated from the contact member
74
, and the peripheral portions thereof are mounted to the contact member
75
so as to be normally in contact therewith.
With the fixed member
71
and the actuating member
72
being accommodated in the recess
73
a
, the case
73
is disposed on the rear side of the insulating plate
69
.
When the case
73
is d
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Easthom Karl D.
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