US4890561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extendable keyboard support assembly
Assignee: Rubbermaid Commercial Products LLC
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Filing: 1985-02-20
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Granted: 1990-01-02
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Expires: 2005-02-20
Abstract
Abstract A keyboard support assembly for a computer work stand is disclosed comprising a subplate (74) having a profiled opening (98, 100) along each side, and a keyboard support plate (78) residing on top of the subplate. A pair of pivotal locking devices (138) are attached to the underside of the keyboard support plate to depend into the subplate profiled openings, and to selectively engage against an underside of the subplate as the keyboard support plate is slideably re-positioned thereon. The locking devices (138) include gear teeth 140 which engage with a gear rack segment 102 along the subplate underside.
Inventors
- 👤 James F. Hampshire
- 👤 Hugh F. Groth
- 👤 John M. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:42
CPC Classifications
A; A47; A47B; A47B21/00; A47B21/03; A47B21/0314; A47B2021/0321; A47B2021/0335; A47B2200/00; A47B2200/0035; A47B2200/004; A47B2200/0043; A47B2200/0046
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
In an extendable keyboard support assembly for a computer work stand, of the type comprising a sub-plate, a keyboard support plate mounted over the sub-plate so as to be reciprocably moveable forward and backward in relation thereto, and a locking device for selectively inhibiting relative movement between the sub-plate and the keyboard support plate; the improvement comprising: the sub-plate having a profiled opening covered by the keyboard support plate, and said locking device being attached to the keyboard support plate to depend into said sub-plate profiled opening, and reciprocably move with said keyboard support plate, and said locking device selectively engaging against an underside surface of said sub-plate.
Claim 2
Dependent Claim
108 words
In an extendable keyboard support assembly for a computer work stand, of the type comprising a sub-plate, a keyboard support plate mounted over the sub-plate so as to be reciprocably moveable forward and backward in relation thereto, and a locking device for selectively inhibiting relative movement between the sub-plate and the keyboard support plate; the improvement comprising: the sub-plate having a profiled opening covered by the keyboard support plate, and said locking device being attached to the keyboard support plate to depend into said sub-plate profiled opening, and reciprocably move with said keyboard support plate, and said locking device selectively engaging against an underside surface of said sub-plate.
Claim 3
Dependent Claim
21 words
An assembly according to claim 1, further comprising means for biasing said locking device against said underside surface of said sub-plate.
Claim 4
Dependent Claim
23 words
An assembly according to claim 1, said sub-plate profiled opening extending partially along one side of the sub-plate from a rearward end thereof.
Claim 5
Dependent Claim
20 words
An assembly according to claim 1, said sub-plate underside surface extending forwardly along a side from proximate said profiled opening.
Claim 6
Dependent Claim
18 words
An assembly according to claim 4, said underside surface comprising a linear rack of downward directed gear teeth.
Claim 7
Dependent Claim
26 words
An assembly according to claim 5, said locking device comprising a lever member having a forward portion for engagement against said underside surface of said sub-plate.
Claim 8
Dependent Claim
20 words
An assembly according to claim 6, said forward lever member portion providing at least one upwardly directly meshing gear tooth.
Claim 9
Dependent Claim
31 words
An assembly according to claim 7, said gear tooth of said forward lever member portion and said gear teeth of said sub-plate underside surface each being of a truncated pyramidal profile.
Claim 10
Dependent Claim
45 words
An assembly according to claim 6, said lever member having an intermediate portion providing a longitudinal channel for receiving a downward projecting extension of said keyboard support plate, and including a transverse pivot pin for securing said intermediate portion to said keyboard support plate extension.
Claim 11
Dependent Claim
38 words
An assembly according to claim 6, said lever member having a rearward actuator end comprising intersecting outward and rearward facing sides recessed within digital proximity of correspondingly intersecting outward and rearward facing sides of said keyboard support plate.
Claim 12
Dependent Claim
126 words
An extendable keyboard support assembly for a computer work stand, comprising: a sub-plate having a profiled opening extending partially along one side from a rearward end thereof, and a downward directed profiled underside surface extending forwardly along said side from proximate said profiled opening; a keyboard support plate slideably mounted over said sub-plate and covering said profiled opening, said keyboard support plate being moveable reciprocally forward and backward in relation to said sub-plate; a lever member depending into said sub-plate profiled opening and comprising: an intermediate portion pivotly attached to said keyboard support plate; a forward end portion for extending beneath and engaging said sub-plate underside surface; and a rearward actuator end portion pivotal upward to disengage said forward end portion from said sub-plate underside surface.
Claim 13
Dependent Claim
126 words
An extendable keyboard support assembly for a computer work stand, comprising: a sub-plate having a profiled opening extending partially along one side from a rearward end thereof, and a downward directed profiled underside surface extending forwardly along said side from proximate said profiled opening; a keyboard support plate slideably mounted over said sub-plate and covering said profiled opening, said keyboard support plate being moveable reciprocally forward and backward in relation to said sub-plate; a lever member depending into said sub-plate profiled opening and comprising: an intermediate portion pivotly attached to said keyboard support plate; a forward end portion for extending beneath and engaging said sub-plate underside surface; and a rearward actuator end portion pivotal upward to disengage said forward end portion from said sub-plate underside surface.
Claim 14
Dependent Claim
38 words
An assembly as set forth in claim 11, wherein said sub-plate underside surface comprises a linear rack of downward directed gear teeth, and said lever member forward end portion comprising at least one upward directed meshing gear tooth.
Claim 15
Dependent Claim
32 words
An assembly as set forth in claim 12, said gear tooth of said forward lever member portion and said gear teeth of said sub-plate underside surface each having a truncated pyramidal profile.
Claim 16
Dependent Claim
47 words
An assembly as set forth in claim 11, wherein said rearward actuator end portion of said lever member comprises a horizontal plate having intersecting outward and rearward facing sides recessed and within digital proximity of correspondingly intersecting outward and rearward facing sides of said keyboard support plate.
References Cited (Backward Citations)
US404396A
Cited
US1228067A
Cited
GB320751A
Cited
US1888736A
Cited
US1995640A
Cited
US2011251A
Cited
US2313023A
Cited
US2235239A
Cited
US2646839A
Cited
FR60328E
Cited
US2678681A
Cited
US2713530A
Cited
DE1119690B
Cited
AT244534B
Cited
US3700301A
Cited
US3919949A
Cited
US4316082A
Cited
US4379429A
Cited
US4440096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |