Patent EP0536792A2 successfully refreshed from Google Patents.
US3936091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headrest for dental chair
Assignee: Sybron Transition Corp
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Filing: 1974-12-23
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Granted: 1976-02-03
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Expires: 1994-12-23
Abstract
Abstract An adjustable headrest for use with the dental chairs and the like which can be tilted forward or backward with respect to the backrest of the chair. The headrest is adjusted with one hand by vertically pulling a lever to disengage a clutch mechanism while simultaneously moving the headrest to the selected inclination.
Inventors
- 👤 Azriel Jay Rabinowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:24
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/10; A61G15/12; A61G15/125
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
A headrest for dental chairs and the like comprising: a. a tang adapted for attachment to a dental chair; b. a headrest journaled to said tang, said headrest including a rear panel having an opening therethrough; c. an actuating member slidably mounted in said headrest to said rear panel, said member having a manually engageable portion extending through said opening; d. a lever arm pivoted intermediate its ends within said headrest to said rear panel; e. a pair of axially aligned clutch members within said headrest frame, one of said clutch members being fixed to said tang at said journal and a second of said clutch members being attached to said lever arm; f. bias means, normally urging said clutch members into engagement to lock said headrest in position; and g. cam means on said actuating member and lever arm member cooperating to pivot said lever arm responsive to the manual movement of said actuating member for moving said second clutch member against said bias and out of engagement with said first member to unlock said headrest.
Claim 2
Dependent Claim
177 words
A headrest for dental chairs and the like comprising: a. a tang adapted for attachment to a dental chair; b. a headrest journaled to said tang, said headrest including a rear panel having an opening therethrough; c. an actuating member slidably mounted in said headrest to said rear panel, said member having a manually engageable portion extending through said opening; d. a lever arm pivoted intermediate its ends within said headrest to said rear panel; e. a pair of axially aligned clutch members within said headrest frame, one of said clutch members being fixed to said tang at said journal and a second of said clutch members being attached to said lever arm; f. bias means, normally urging said clutch members into engagement to lock said headrest in position; and g. cam means on said actuating member and lever arm member cooperating to pivot said lever arm responsive to the manual movement of said actuating member for moving said second clutch member against said bias and out of engagement with said first member to unlock said headrest.
Claim 3
Dependent Claim
33 words
A headrest as in claim 1 including second bias means for urging said actuating member towards said journal so as to automatically return said actuating member to a headrest locking position when released.
Claim 4
Dependent Claim
37 words
A headrest as in claim 1 wherein said actuating member is slidably mounted to said rear panel by means of a plurality of parallel guide pins projecting through a plurality of elongated slots in said actuating member.
Claim 5
Dependent Claim
32 words
A headrest as in claim 3, wherein said second bias means are springs attached to said guide pins and said actuating means so as to urge said actuating means towards said tang.
Claim 6
Dependent Claim
27 words
A headrest as set forth in claim 1 wherein said journal includes an axle pin, said second clutch member being slidably mounted on the said axle pin.
Claim 7
Dependent Claim
36 words
A headrest as set forth in claim 1 wherein said second clutch member is carried on one end of said lever arm and said cam means is carried on the other end of said lever arm.
Claim 8
Dependent Claim
29 words
A headrest as in claim 1 wherein said cam means comprises cam slot on one of said actuating member and lever arm and a cam follower on the other.
Claim 9
Dependent Claim
27 words
A headrest as in claim 7 wherein said cam slot is on said actuating member and said cam follower is on one end of said lever arm.
Claim 10
Dependent Claim
28 words
A headrest as in claim 1 wherein said bias means is a coil spring about said axle pin and biased between said second clutch member and said tang.
Claim 11
Dependent Claim
43 words
A headrest as in claim 1 including a sleeve within said headrest adjacent to the top thereof adapted to slidably receive an instrument parking bracket, said headrest having openings at the sides thereof to permit passage of said parking bracket into said sleeve.
Claim 12
Dependent Claim
161 words
A headrest-backrest combination for dental chairs and the like comprising: a. a backrest provided with a cut-out portion extending inward into said backrest from an upper end surface thereof; b. a tang adapted to slidably extend into said cut-out; c. a headrest journaled for articulation about said tang, said journal being located within said cut-out and below said backrest upper end surface so that the articulation of said headrest about said tang occurs at a point spaced from the occipital of a patient's head resting on said headrest; d. a friction lock means on said backrest and engaging said tang, for maintaining said headrest at an adjusted spaced distance from said backrest upper end surface; e. positive lock means within said headrest for locking said headrest at an adjusted articulated position; and f. one hand operative means for operating said positive and friction lock means to move said headrest to an adjusted articulated and spaced position with respect to said backrest.
Claim 13
Dependent Claim
161 words
A headrest-backrest combination for dental chairs and the like comprising: a. a backrest provided with a cut-out portion extending inward into said backrest from an upper end surface thereof; b. a tang adapted to slidably extend into said cut-out; c. a headrest journaled for articulation about said tang, said journal being located within said cut-out and below said backrest upper end surface so that the articulation of said headrest about said tang occurs at a point spaced from the occipital of a patient's head resting on said headrest; d. a friction lock means on said backrest and engaging said tang, for maintaining said headrest at an adjusted spaced distance from said backrest upper end surface; e. positive lock means within said headrest for locking said headrest at an adjusted articulated position; and f. one hand operative means for operating said positive and friction lock means to move said headrest to an adjusted articulated and spaced position with respect to said backrest.
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |