Patent US5466901A successfully refreshed from Google Patents.
US5466901A
Expired / Lapsed
US
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Keyswitch assembly having mechanism for controlling touch of keys
Assignee: Brother Industries Ltd
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Filing: 1994-10-05
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Granted: 1995-11-14
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Expires: 2014-10-05
Abstract
Abstract A keyswitch assembly having a mechanism for controlling touch of a plurality of keys simultaneously. Each key is vertically movably supported on a holder member by a key support assembly. The key support assembly has first and second links intersecting with each other and pivotally connected together at the intersecting portion. A first end of the first link is pivotally connected to the key and a second end of the first link is slidably movable in a horizontal direction and is pivotally connected to the holder member. A first end of the second link is pivotally connected to the holder member, and a second end of the second link is slidably movable in the horizontal direction and is pivotally connected to the key. A biasing segment is connected to the second end of the first link for urging the same. The biasing force of the biasing segment is controllable by moving an operation plate which is connected to the biasing segment.
Inventors
- 👤 Isao Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:37
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/02; H01H3/12; H01H3/122; H01H3/125; H01H13/00; H01H13/50; H01H13/52; H01H2013/525; H01H2227/00; H01H2227/032; H01H2227/034; H01H2227/036
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
130 words
A keyswitch assembly comprising: a key having a lower surface and movable between an upper position and a lower position; a holder member positioned below the key; a key support assembly provided between the key and the holder member for guiding vertical movement of the key, the key support assembly comprising a first link and a second link intersecting with the first link and pivotally connected thereto at their intersecting portion; a switching portion disposed below the key for switching action actuated upon depression of the key, the key support assembly bearing on the switching portion when the key is moved to the lower position; and an urging member for urging one of the first and second links in a horizontal direction to move the key to the upper position.
Claim 2
Dependent Claim
130 words
A keyswitch assembly comprising: a key having a lower surface and movable between an upper position and a lower position; a holder member positioned below the key; a key support assembly provided between the key and the holder member for guiding vertical movement of the key, the key support assembly comprising a first link and a second link intersecting with the first link and pivotally connected thereto at their intersecting portion; a switching portion disposed below the key for switching action actuated upon depression of the key, the key support assembly bearing on the switching portion when the key is moved to the lower position; and an urging member for urging one of the first and second links in a horizontal direction to move the key to the upper position.
Claim 3
Dependent Claim
102 words
The key switch assembly as claimed in claim 1, wherein the first link has a first end pivotally connected to the lower surface of the key and a second end slidably movable in a first horizontal direction and opposite horizontal direction and pivotally connected to the holder member, and the second link has a first end pivotally connected to the holder member and a second end slidably movable in the first and opposite horizontal direction and pivotally connected to the lower surface of the key, the urging member urging one of the second ends of the links in the first horizontal direction.
Claim 4
Dependent Claim
43 words
The key switch assembly as claimed in claim 2, wherein the urging member is provided in the holder member and is engageable with the second end of the first link for urging the second end of the first link in the first direction.
Claim 5
Dependent Claim
48 words
The key switch assembly as claimed in claim 3, wherein the holder member is made of a resilient plastic material and is formed with an opening, the switching portion being positioned in the opening, and wherein the urging member comprises an elongated biasing segment extending from the opening.
Claim 6
Dependent Claim
21 words
The key switch assembly as claimed in claim 4, wherein the elongated biasing segment is provided integrally with the holder member.
Claim 7
Dependent Claim
27 words
The key switch assembly as claimed in claim 5, further comprising a key touch control mechanism connected to the elongated biasing segment for controlling biasing force thereof.
Claim 8
Dependent Claim
90 words
The key switch assembly as claimed in claim 6, wherein the key touch control mechanism comprises: an operation plate positioned below the holder member and being slidable in a second horizontal direction and opposite horizontal direction, the second horizontal direction being perpendicular to the first horizontal direction; and an upstanding segment extending from the operation plate, the upstanding segment being positioned in contact with the elongated biasing segment for changing urging force of the elongated biasing segment upon movement of the operation plate in the second and opposite horizontal directions.
Claim 9
Dependent Claim
22 words
The key switch assembly as claimed in claim 7, wherein the upstanding segment comprises a cut-and-folded back portion of the operation plate.
Claim 10
Dependent Claim
30 words
The key switch assembly as claimed in claim 8, wherein the switching portion comprises a flexible circuit board having switching electrodes in alignment with the opening of the holder member.
Claim 11
Dependent Claim
52 words
The key switch assembly as claimed in claim 3, wherein the holder member is formed with an opening and the switching portion is positioned in the opening, and wherein the urging member comprises a coil spring having two ends, one end being connected to one of the second ends of the links.
Claim 12
Dependent Claim
33 words
The key switch assembly as claimed in claim 10, further comprising a key touch control mechanism connected to the other end of the coil spring for controlling biasing force of the coil spring.
Claim 13
Dependent Claim
80 words
The key switch assembly as claimed in claim 11, wherein the keytouch control mechanism comprises: an operation plate positioned below the holder member and being slidable in the first horizontal direction and opposite horizontal direction; and an upstanding segment extending from the operation plate, the upstanding segment being positioned in contact with the other end of the coil spring for changing urging force of the coil spring upon movement of the operation plate in the first and opposite horizontal directions.
Claim 14
Dependent Claim
22 words
The key switch assembly as claimed in claim 12, wherein the upstanding segment comprises a cut-and-folded back portion of the operation plate.
Claim 15
Dependent Claim
32 words
The key switch assembly as claimed in claim 13, wherein the switching portion comprises a flexible circuit board having switching electrode at positions in alignment with the opening of the holder member.
Claim 16
Dependent Claim
48 words
The key switch assembly as claimed in claim 3, wherein the holder member is formed with an opening and the switching portion is positioned in the opening, and wherein the urging member comprises a leaf spring with which one of the second ends of the links is contacted.
Claim 17
Dependent Claim
29 words
The key switch assembly as claimed in claim 15, further comprising a key touch control mechanism connected to the leaf spring for controlling biasing force of the leaf spring.
Claim 18
Dependent Claim
77 words
The key switch assembly as claimed in claim 16, wherein the key touch control mechanism comprises: an operation plate positioned below the holder member and being slidable in the first horizontal direction and opposite horizontal directions, the leaf spring integrally extending from the operation plate to contact the one of the second ends of the links for changing urging force of the leaf spring upon movement of the operation plate in the first and opposite horizontal directions.
Claim 19
Dependent Claim
22 words
The key switch assembly as claimed in claim 17, wherein the leaf spring comprises a cut-and-folded back portion of the operation plate.
Claim 20
Dependent Claim
30 words
The key switch assembly as claimed in claim 18, wherein the switching portion comprises a flexible circuit board having switching electrodes in alignment with the opening of the holder member.
Claim 21
Dependent Claim
36 words
The key switch assembly as claimed in claim 1, further comprising an upwardly urging member positioned above the switching portion and contactable with the intersecting portion of the key support assembly for urging the key upwardly.
Claim 22
Dependent Claim
164 words
A key switch assembly comprising: a key movable between an upper position and a lower depressed position; a holder member positioned below the key; a switching member positioned beneath the key and adjacent the holder member; a key support assembly coupled between the key and the holder member that supports the key and guides vertical movement of the key, the key support assembly comprising a first link having a first end pivotally coupled to the key and a second end slidingly coupled to the holder member and a second link pivotally connected to the first link and having a first end slidingly coupled to the key and a second end pivotally coupled to the holder member, wherein upon depression of the key, the key support assembly actuates the switching member; and an urging member contacting one end of one of the first and second links that urges the first and second links to pivot with respect to each other and bias the key upwardly.
Claim 23
Dependent Claim
164 words
A key switch assembly comprising: a key movable between an upper position and a lower depressed position; a holder member positioned below the key; a switching member positioned beneath the key and adjacent the holder member; a key support assembly coupled between the key and the holder member that supports the key and guides vertical movement of the key, the key support assembly comprising a first link having a first end pivotally coupled to the key and a second end slidingly coupled to the holder member and a second link pivotally connected to the first link and having a first end slidingly coupled to the key and a second end pivotally coupled to the holder member, wherein upon depression of the key, the key support assembly actuates the switching member; and an urging member contacting one end of one of the first and second links that urges the first and second links to pivot with respect to each other and bias the key upwardly.
Claim 24
Dependent Claim
17 words
The key switch assembly of claim 21, wherein the urging member is coupled to the holder member.
Claim 25
Dependent Claim
25 words
The key switch assembly of claim 21, wherein the urging member contacts the second end of the first link slidingly coupled to the holder member.
Claim 26
Dependent Claim
15 words
The key switch assembly of claim 21, wherein the urging member is a coil spring.
Claim 27
Dependent Claim
15 words
The key switch assembly of claim 21, wherein the urging member is a leaf spring.
Claim 28
Dependent Claim
20 words
The key switch assembly of claim 21, wherein the urging member is a leaf spring coupled to the holder member.
Claim 29
Dependent Claim
21 words
The key switch assembly of claim 21, further comprising an upwardly urging member positioned between the key and the switching member.
Claim 30
Dependent Claim
25 words
The key switch assembly of claim 21, further comprising an adjusting mechanism contacting the urging member that adjusts the biasing force of the urging member.
Claim 31
Dependent Claim
59 words
The key switch assembly of claim 28, wherein the adjusting mechanism comprises an operation plate disposed adjacent the holder member and an engagement segment extending from the operation plate that contacts the urging member, wherein a distance between the engagement segment and the end of the one of the first and second links contacting the urging member is adjustable.
Claim 32
Dependent Claim
22 words
The key switch assembly of claim 29, wherein the operation plate and the holder member are slidable with respect to each other.
References Cited (Backward Citations)
US4433225A
Cited
US4580022A
Cited
US4902862A
Cited
JPH0451388A
Cited
JPH0476224A
Cited
US5278371A
Cited
US5268545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-13 | 1999-05-15 | 1999-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-13 | 2003-05-15 | 2003-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-13 | 2007-05-15 | 2007-11-14 | $7700.00 | Window Closed / Lapsed |