Patent US3586374A successfully refreshed from Google Patents.
US3586374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental chair
Assignee: Sybron Transition Corp
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Filing: 1969-12-08
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Granted: 1971-06-22
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Expires: 1989-12-08
Abstract
Abstract Disclosed is a dental chair which can be adjusted to suit different body sizes ranging from children to average-size adults wherein the length of the backrest portion of the chair can be increased or decreased and wherein the arms of the chair are adjustable outwardly from the chair to increase the distance across the seat portion between the armrests or, if desired, the armrests can be removed.
Inventors
- 👤 Fritz B Laessker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:36
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/10; A61G15/105; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/402
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A dental chair having adjustable back and arms comprising: a. a seat portion; b. a back frame pivotally connected at one end to said seat portion; c. a backrest slidably supported by said back frame for longitudinal movement with respect to said back frame; d. an armrest on each side of said back frame; e. a receiving sleeve attached to and extending inwardly from one side of said back frame and having spaced internal detent means; f. a shaft extending slidably into said sleeve and extendable outwardly therefrom, one of said armrests being attached to said shaft; and g. releasable lock means carried by said shaft and engageable with said receiving sleeve spaced intervals detent means for locking said shaft and said armrest at intervals outwardly spaced from said back frame to increase the distance between said armrests across said seat portion.
Claim 2
Dependent Claim
142 words
A dental chair having adjustable back and arms comprising: a. a seat portion; b. a back frame pivotally connected at one end to said seat portion; c. a backrest slidably supported by said back frame for longitudinal movement with respect to said back frame; d. an armrest on each side of said back frame; e. a receiving sleeve attached to and extending inwardly from one side of said back frame and having spaced internal detent means; f. a shaft extending slidably into said sleeve and extendable outwardly therefrom, one of said armrests being attached to said shaft; and g. releasable lock means carried by said shaft and engageable with said receiving sleeve spaced intervals detent means for locking said shaft and said armrest at intervals outwardly spaced from said back frame to increase the distance between said armrests across said seat portion.
Claim 3
Dependent Claim
25 words
A dental chair as in claim 1 wherein said backrest is spring biased to facilitate movement of said backrest with respect to said back frame.
Claim 4
Dependent Claim
44 words
A dental chair as set forth in claim 1 comprising: a. a pair of spaced bearing supports fixed to said back frame; and b. an elongated support member slidably supported by said bearings, said support member being connected adjacent its ends to said backrest.
Claim 5
Dependent Claim
33 words
A dental chair as in claim 3 comprising friction lock means carried by one of said bearing supports and engageable with said elongated support members for locking said backrest in an adjusted position.
Claim 6
Dependent Claim
33 words
A dental chair as in claim 3 wherein said elongated support member has an axial bore and a spring in said bore biased between one end of said bore and said back frame.
Claim 7
Dependent Claim
27 words
A dental chair as in claim 5 comprising a pin fixed to said back member and extending into said bore said spring being disposed about said pin.
Claim 8
Dependent Claim
34 words
A combination as in claim 1 wherein said receiving sleeve spaced interval detent means is located along the inner periphery of said sleeve, said releasable lock means including a member for engaging said detents.
Claim 9
Dependent Claim
138 words
A combination as in claim 7 wherein said shaft has an axial bore therethrough and a radial opening through the wall of said shaft communicating with said axial bore, said releasable lock means comprising: a. a movable member extending through said radial shaft opening for engagement with said detents; b. a pushrod slidably retained in said axial shaft bore, one end of said rod having a recessed cam portion receiving said movable member and another end of said rod extending outwardly from said shaft; c. bias means normally urging said rod in a direction camming said member partly through said radial shaft opening and into said detent for locking said arm in position; and d. means for urging said rod against said bias to receive said member into said cam recess and release said member from said detent.
Claim 10
Dependent Claim
41 words
A combination as in claim 1 wherein said one armrest has its second end attached to an elongated support member, and universal joints at the ends of said support member connecting said member to said arm rest and chair seat respectively.
Claim 11
Dependent Claim
45 words
A combination as in claim 1 comprising a headrest slidably supported by said backrest for longitudinal movement with respect to said backrest, said backrest having spaced bearings and a rod extending slidably through said bearings, said rods being connected at one end to said headrest.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |