Patent US3934929A successfully refreshed from Google Patents.
US3934929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable dental chair
Assignee: Sybron Transition Corp
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Filing: 1974-09-03
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Granted: 1976-01-27
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Expires: 1994-09-03
Abstract
Abstract The dental chair is provided which has pivotally connected back, seat and footrest sections, the seatrest being journaled in turn to a base member. A motor carried by the seat and connected to the backrest provides for articulation of the backrest relative to the seat. A link extending between the back and footrest provides for articulation of the footrest relative to seat and a cam connected between the link and seat provides for articulation of the seat about the base member; all movements being accomplished simultaneously upon operation of the motor.
Inventors
- 👤 Azriel Jay Rabinowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:22
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/02; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/034; A47C1/035
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A dental chair comprising: a. pivotally connected back, seat and footrest sections; b. a base having a rearward portion pivotally supporting said seatrest section and a forward guide portion; c. motor means carried by said seatrest section and operatively connected to said backrest section for articulating said backrest relative to said seatrest; d. a linearly movable link connected to said backrest and extending through said guide portion to contact said footrest section for articulating said footrest responsive to movement of said backrest; and e. cam means connecting said link and seatrest section for articulating said seatrest about said rearward portion responsive to movement of said backrest.
Claim 2
Dependent Claim
106 words
A dental chair comprising: a. pivotally connected back, seat and footrest sections; b. a base having a rearward portion pivotally supporting said seatrest section and a forward guide portion; c. motor means carried by said seatrest section and operatively connected to said backrest section for articulating said backrest relative to said seatrest; d. a linearly movable link connected to said backrest and extending through said guide portion to contact said footrest section for articulating said footrest responsive to movement of said backrest; and e. cam means connecting said link and seatrest section for articulating said seatrest about said rearward portion responsive to movement of said backrest.
Claim 3
Dependent Claim
37 words
A dental chair as in claim 1 in which said backrest is pivotally supported at a point spaced above said seatrest and has a lower extension, one end of said link being connected to said backrest extension.
Claim 4
Dependent Claim
49 words
A dental chair as in claim 2 comprising: a. a clevis depending from said seatrest; and b. said motor means including a reversible drive motor pivotally connected to said clevis and a screw translated by said drive motor, one end of said screw being connected to said backrest extension.
Claim 5
Dependent Claim
32 words
A dental chair as in claim 2 wherein said cam means comprises: a. an arcuate cam slot in said seatrest; and b. a cam follower on said link engaged in said slot.
Claim 6
Dependent Claim
34 words
A dental chair as in claim 3 wherein said drive motor is of the type having an internal rotating drive nut wherein said nut rotates to translate said screw in a rotation free manner.
Claim 7
Dependent Claim
60 words
A dental chair as in claim 1, wherein the length of said link is adjustable and includes: a. a member pivoted intermediate its ends to one of said link; b. a roller on said member engagable against said footrest c. means on said link for rotating said member about said link end to adjust the effective length of said link.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |