US3761128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headrest for an ophthalmic chair or the like
Assignee: American Optical Corp
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Filing: 1972-09-11
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Granted: 1973-09-25
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Expires: 1992-09-11
Abstract
Abstract A spring mounted linkage system adjustably supporting a headrest characterized by a single reciprocally movable knob uniquely capable of locking the headrest in various positons.
Inventors
- 👤 G Schenk
- 👤 I Bosack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:41
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/38; A61; A61G; A61G15/00; A61G15/10; A61G15/12; A61G15/125
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
An adjustable headrest support linkage system of the bracket, link and arm type comprising: head support means carried adjacent one end of an elongated arm, the arm pivotally interconnected with an intermediate link by a bearing, the bearing being fixed relative to the arm, the bearing pivotally associating an end portion of the arm with an intermediate link, there being a split shaft associated with the link and arranged to move axially thereof, an additional bearing pivotally associated with the other end of the link and with chair support structure, said additional bearing being fixed relative to the chair support structure, locking means carried by the link intermediate its ends in position to reciprocally move the split portions axially of the link so that opposed ends thereof are substantially coincidentally moved into association with the bearings, there being means on said opposed ends of the split shaft arranged for locking the bearings in position upon appropriate adjustment of the locking means.
Claim 2
Dependent Claim
161 words
An adjustable headrest support linkage system of the bracket, link and arm type comprising: head support means carried adjacent one end of an elongated arm, the arm pivotally interconnected with an intermediate link by a bearing, the bearing being fixed relative to the arm, the bearing pivotally associating an end portion of the arm with an intermediate link, there being a split shaft associated with the link and arranged to move axially thereof, an additional bearing pivotally associated with the other end of the link and with chair support structure, said additional bearing being fixed relative to the chair support structure, locking means carried by the link intermediate its ends in position to reciprocally move the split portions axially of the link so that opposed ends thereof are substantially coincidentally moved into association with the bearings, there being means on said opposed ends of the split shaft arranged for locking the bearings in position upon appropriate adjustment of the locking means.
Claim 3
Dependent Claim
40 words
The arrangement of claim 1 in which said bearings are splined and in which the opposed ends of the split shaft have serrations arranged to mate with the splines on the bearings to lock the head support means in position.
Claim 4
Dependent Claim
42 words
The arrangement of claim 1 further including spring means operatively interconnected between the link and the portions of the split shaft arranged to urge the split shaft elements out of locking association with the bearings upon appropriate movement of the locking means.
Claim 5
Dependent Claim
98 words
The arrangement of claim 1 in which said locking means is comprised of an externally accessible knob having depending therefrom a threaded shaft arranged to mate with complementary threads in the link whereby the knob is moved into and out of engagement with said link, there being additional means depending axially from the threaded shaft, said additional means including cam surfaces arranged to cooperate with opposed ends of the split portions of the shaft whereby, upon threading and unthreading of the knob, the cam surfaces move the shaft portion into and out of locking association with the bearings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |