Information
-
Patent Grant
-
6831242
-
Patent Number
6,831,242
-
Date Filed
Monday, June 10, 200222 years ago
-
Date Issued
Tuesday, December 14, 200420 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Birch, Stewart, Kolasch & Birch, LLP
-
CPC
-
US Classifications
Field of Search
US
- 200 521
- 200 534
- 200 535
- 200 533
- 200 341
- 200 345
-
International Classifications
-
Abstract
A push switch device of the invention comprises a body including a set of terminals and closed via a cover. An inner side of the cover is provided with a second resilient unit on which is formed a stopper portion. A push unit is further formed through the body, the push unit being provided with a stop controller pad made of an abrasion-resistant material that is vis-à-vis the stopper portion. A first resilient unit is further placed below the push unit. With the above disposition, when a pressure is exerted on the push unit, the stop controller pad pushes on the stopper portion that moves outwardly. Thereby damage due to wear of the push unit is prevented.
Description
FIELD OF THE INVENTION
The invention relates to a structure of push switch device and, more particularly, to a structure that can enhance the service life of the push switch device.
BACKGROUND OF THE INVENTION
FIG. 1
is an exploded view that schematically illustrates a structure of push switch device disclosed in a previous U.S. patent application Ser. No. 09/740,997, now U.S. Pat. No. 6,441,331, filed by the same applicant as the present application. As illustrated, the push switch device of the prior art, used to signal connection or output, comprises a body on which two terminals are mounted. A first resilient unit is further arranged within the body, below a push unit. A cover further closes the cover. Under the application of an external pressure therein, the push unit drives a displacement of the second resilient unit to push on the first resilient unit. Under the application of an external pressure thereon, the push unit drives a displacement of the second resilient unit to push on the first resilient unit. Under this down pushing action, the first resilient unit establishes electrical contact with two terminals, thereby establishing an electrical output. When no pressure is exerted on the push unit, the first and second resilient units exert a reverse resilient force that lets the push unit recover its initial position.
Although the above structure is simpler than traditional structures of push switch device and has less contact points, which reduces the electric resistance and prevents signal deterioration, but improvements still need to be accomplished with respect to the disposition of the resilient units.
Therefore, the same applicant has disclosed another structure of push switch device in another application, as also illustrated in FIG.
2
. As shown in
FIG. 2
, this structure includes a body, two terminals disposed on the body, a resilient unit arranged within the body, a push unit arranged above the resilient unit within the body, and a cover closing over the body. The above structure, suitable for signal connection and output, is characterized in that the resilient unit is comprised of an actuating portion that extends into support portions at two ends, these support portions being disposed within the body. Furthermore, the push unit is provided with a recess to receive the actuating portion of the resilient unit. With this disposition, when the push unit is pushed down, an inner radius of the actuating portion contracts, which causes the support portions to be pushed down and electrically contact with the terminals, thereby establishing a signal connection. When no external pressure is exerted on the push unit, the resilient unit exerts a reverse resilient force that let the push unit recover its initial position.
The second structure of push switch device as illustrated in
FIG. 2
provides a simpler and more achieved construction in comparison with the first structure as illustrated in FIG.
1
. However, both structures still have the following disadvantages. The feeling of push contact the user have when pushing and the accompanying sound are produced via the contact between a recess of the push unit and the corresponding second resilient unit and protruding point formed on the cover. The push unit being usually made of plastics and the cover of metal, a pushing action on the push unit therefore easily causes the protruding point of the metallic cover to scrape the plastics-made push unit. With numerous pushing actions, the scrape on the push unit becomes increasingly deeper until it is deeper than the length of the protruding point of the cover. As a result, no push contact feeling and corresponding sound are therefore produced, which negatively reduces the service life of these elements.
SUMMARY OF THE INVENTION
Accordingly, it is therefore a principal object of the invention to provide a structure of switch device that can overcome the above problems of push unit wear off due to scraping effects for producing a push contact feeling and corresponding sound. Thereby, the service life of the switch device and its quality are enhanced.
To attain the above and other objectives, a push switch device of the invention comprises a body including a set of terminals, a periphery of the body being further provided with a first assembly element. A cover includes a second assembly element that assembles with the first assembly element of the body in a manner to close the body. An inner side of the cover is provided with a second resilient unit on which is formed a stopper portion. A push unit is further formed through the body, the push unit being provided with a stop controller pad made of an abrasion-resistant material that faces the stopper portion. A first resilient unit is further placed below the push unit.
With the above disposition, when a pressure is exerted on the push unit, the stop controller pad pushes on the stopper portion that moves outwardly. Thereby a wearing damageable contact of the stopper portion with the push unit is prevented, meanwhile the first and second assembly elements enable a rapid and simple assembly of the body with the cover.
To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings included herein, which are given by way of illustration only, and thus are not limitative of the present invention, provide a further understanding of the invention. A brief introduction of the drawings is as follows:
FIG. 1
is an exploded view of a structure of push device of the prior art;
FIG. 2
is an exploded view of another structure of push switch device of the prior art;
FIG. 3
is an exploded view of a structure of push switch device according to an embodiment of the invention;
FIG. 4
is an exploded view of the push switch device without the cover according to an embodiment of the invention;
FIG. 5A
is a section view taken along the section
5
A in
FIG. 4
;
FIG. 5B
is a schematic view illustrating a displacement with respect to the configuration shown in
FIG. 5A
;
FIG. 6A
is a section view taken along the section
6
A in
FIG. 7
;
FIG. 6B
is a schematic view illustrating a displacement with respect to the configuration shown in
FIG. 6A
; and
FIG. 7
is an assembled view of the push switch of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Wherever possible in the following description, like reference numerals will refer to like elements and parts unless otherwise illustrated.
FIG. 3
is a general exploded view of a push switch device according to an embodiment of the invention.
FIG. 4
is an exploded view of the push switch device of the invention without the cover
40
.
FIG. 7
is an assembled view of the push switch device of the invention. As illustrated, a push switch device of the invention respectively comprises the assembly of a body
10
with a cover
40
, a set of terminals
20
,
20
′ mounted on the body
10
, a push unit
50
disposed within the body
10
with a portion exposed out of the body
10
, and a first resilient unit
30
mounted below the push unit
50
so as to exert a resilient force for re-positioning the push unit
50
. From the above elements, a push switch device for signals switching or output is constructed.
The body
10
internally defines a displacement space
11
at two sides of which are formed protruding portions
12
,
12
′. At a top end, the protruding portions
12
,
12
′ respectively extend in abutments
15
,
15
′ that define an opening
16
communicating with the displacement space
11
. At one side, a sidewall of one protruding portion
12
includes a first engagement slot
13
that enables the mount of the first resilient unit
30
. On a sidewall of the other protruding portion
12
′ and on a bottom surface of the displacement space
11
are further respectively formed first and second mounting slots
14
,
17
.
The terminals
20
,
20
′ respectively include segments
21
,
21
′ on which are respectively erected connecting sections
22
,
22
′ for electrical signals transmission. To simplify the fabrication process and reduce the fabrication time and process sequence, the terminals
20
,
20
′ are directly buried within the body
10
when the body
10
is formed. More particularly, the terminals
20
,
20
′ are placed within
20
the body
10
in a manner that one connecting section
22
is disposed in the second mounting slot
17
while the other connecting section
22
′ is placed on the first mounting slot
14
of the protruding portion
12
′. The connecting section
22
′ is further provided with a second engagement slot
23
for mounting the first resilient unit
30
.
The first resilient unit
30
can be, for example, a metallic torsion spring that is principally comprised of a loop resilient portion
31
extending into support portions
32
,
32
′ at two ends. The support portions
32
,
32
′ are placed over the body
10
in a manner to engage the first engagement slot
13
and the second engagement slot
23
of the terminal
20
′. Hence, when the first resilient unit
30
is subject to a pressure, an inner radius of the loop resilient portion
31
is slightly contracted. Under a resulting pressure, the support portions
32
,
32
′ are pushed down so as to contact with the connecting sections
22
,
22
′. The displacement of the first resilient unit
30
thereby achieves the switching operation to contact with the connecting sections
22
,
22
′, thereby allowing signal transmission through the terminals
20
,
20
′.
The push unit
50
includes a push head
51
that downwardly extends through a neck portion
52
into a protrusion
53
. A side of the protrusion
53
is provided with a connecting slot
54
that enables the mount of the loop resilient portion
31
. Another side of the protrusion
53
facing a side of the cover
40
is further provided with a recess
55
in which is placed a stop controller pad
56
made of an abrasion-resistant material. Furthermore, two sides of the protrusion
53
are formed into oblique faces
57
that enable the displacement of the first resilient unit
30
and consequently, the move of the support portions
32
,
32
′ of the first resilient unit
30
.
The cover
40
is made of a metallic material and is provided with a second resilient unit
42
on which is arranged a stopper portion
44
facing the stop controller pad
56
. Thereby, when the push unit
50
moves downward, the stop controller pad
56
pushes the stopper portion
44
to produce a push contact feeling. Furthermore, when the push unit
50
moves upward to be re-positioned, the second resilient unit
42
of the cover
40
pushed the push unit
50
, thereby producing a sound. The second resilient unit
42
can be formed from, for example, an arcuate cut slot
41
directly formed through the cover
40
. The stopper portion
44
can be, for example, a second groove
43
directly formed through the second resilient unit
42
. The body
10
and the cover
40
are further provided with assembly elements
18
,
45
that mount with each other.
Referring to FIG.
5
A and
FIG. 5B
, when the push head
51
of the push unit
50
is subject to an external pressure, the neck portion
52
slides along the opening
16
of the body
10
and the push unit
50
hence pushes on the first resilient unit
30
. Because one respective side of each support portion
32
,
32
′ is originally permanently connected to one connecting section
22
,
22
′ placed in the first and second mounting slots
14
,
17
, the push on the first resilient unit
30
produces a contraction thereof. As a result, one respective second side of each support portion
32
,
32
′ to electrically contact with the connecting sections
22
,
22
′ placed in the second mounting slot
17
, thereby producing an electrical output. When the push head
51
no longer receives an external pressure thereon, the push unit
50
is subject to a resilient force from the first resilient unit
30
and consequently recovers its initial position.
Referring to FIG.
6
A and
FIG. 6B
, when the push unit
50
is pushed down, the stop controller pad
56
pushes on the stopper portion
44
to produce a push contact feeling while the second resilient unit
42
of the cover
40
produces a revere resilient force. Hence, a direct damageable contact of the stopper portion
44
with the push unit
50
, which may wear away the surface of the protrusion
53
, is thereby prevented. When the external pressure is released, the stopper portion
44
is subject to the reverse force from second resilient unit
42
to recover its initial position and, consequently, pushes the surface of the protrusion
53
, which produces a sound. Thereby, the effective switching action of the switch can be felt once the push action is stopped.
It should be apparent to those skilled in the art that the above description is only illustrative of specific embodiments and is examples of the invention. The invention should therefore cover various modifications and variations made to the herein-described structure and operations of the invention, provided they fall within the scope of the invention as defined in the following appended claims.
Claims
- 1. A push switch device, comprising:a body, including a set of terminals, a periphery of the body being further provided with a first assembly element; a cover, including a second assembly element facing the first assembly element of the body, an inner side of the cover being further provided with a second resilient unit on which is formed a stopper portion, the second resilient unit being formed from an arcuate slot cut through the cover; a push unit positioned in the body, the push unit being provided with a stop controller pad made of an abrasion-resistant material that faces the stopper portion; and a first resilient unit; wherein when pressure is exerted on the push unit, the stop controller pad pushes the stopper portion outwardly, thereby avoiding damage due to wear of the push unit, the first and second assembly elements enable a rapid and simple assembly of the body with the cover and wherein two sides of the push unit are formed into oblique faces that enable movement of the first resilient unit.
- 2. The structure of claim 1, wherein the push unit is further provided with a recess arranged opposite the stop controller pad.
- 3. The structure of claim 1, wherein the stop controller pad is made of metallic material.
- 4. The structure of claim 1, wherein the cover is made of metallic material, and the stopper portion is formed at a groove formed in the second resilient unit.
- 5. The structure of claim 1, wherein the stopper portion and the second resilient unit form a notch for receiving the stop controller pad before and after pressure is exerted on the push unit, the stop controller pad being moved from the notch when pressure is exerted on the push unit to move the stopper portion outwardly.
- 6. The structure of claim 1, wherein the set of terminals includes a first terminal and a second terminal, the first resilient unit being in contact with the first terminal and also being movable into contact with the second terminal when the push unit is moved.
- 7. The structure of claim 6, wherein the stop controller pad pushes on the stopper portion when the push unit is moved and whereafter upon release of pressure exerted on the push unit, the push unit is urged by the first resilient unit back to a home position whereat the stop controller pad stops pushing the stopper portion outwardly.
- 8. The structure of claim 7, wherein the first resilient unit continues to engage the first terminal but fails to engage the second terminal when the push unit is in the home position.
- 9. The structure of claim 6, wherein the first resilient unit is a torsion spring.
- 10. The structure of claim 6, wherein the first terminal is to a side of the first resilient unit and wherein the second terminal is below the first resilient unit, the first resilient unit being between the push unit and the second terminal.
- 11. The structure of claim 1, wherein a side of the push unit has an annular opening for receiving a portion of the first resilient unit.
- 12. The structure of claim 1, wherein the second resilient unit and the cover are a one-piece structure.
US Referenced Citations (4)