Patent US3813147A successfully refreshed from Google Patents.
US3813147A
Expired / Lapsed
US
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Dental apparatus
Assignee: Sybron Transition Corp
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Filing: 1972-10-10
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Granted: 1974-05-28
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Expires: 1992-10-10
Abstract
Abstract Disclosed is a dental apparatus comprising a chair-instrument tray combination, wherein the instrument tray is attached to the articulating backrest of the dental chair so that the tray follows the movement of the backrest. The support of the tray includes a parallelogram linkage which maintains the tray horizontally oriented as the backrest is moved between an upright and a reclined position. The tray support also includes a leveling mechanism for initially leveling the tray and adjusting it parallel to the true horizontal independent of the chair itself. This is to compensate for situations where the floor on which the chair rests is not level.
Inventors
- 👤 M Rick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:23
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/14; A47; A47C; A47C7/00; A47C7/62; A47C7/68
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
Dental apparatus comprising in Combination: a. a dental chair having a seat frame and a backrest frame, said backrest being supported for deflection between an upright and a reclined position; b. a parallel motion linkage having a first portion supported by said seat frame, and a second portion rotatable by said linkage in concert with said backrest as the latter is deflected between an upright position and a reclined position; and c. a horizontally oriented tray member carried by said second portion, said tray being maintained horizontally oriented by said linkage as said second portion rotates in concert wtih said backrest frame.
Claim 2
Dependent Claim
102 words
Dental apparatus comprising in Combination: a. a dental chair having a seat frame and a backrest frame, said backrest being supported for deflection between an upright and a reclined position; b. a parallel motion linkage having a first portion supported by said seat frame, and a second portion rotatable by said linkage in concert with said backrest as the latter is deflected between an upright position and a reclined position; and c. a horizontally oriented tray member carried by said second portion, said tray being maintained horizontally oriented by said linkage as said second portion rotates in concert wtih said backrest frame.
Claim 3
Dependent Claim
59 words
A combination as set forth in claim 1 including means for rotating said second portion in concert with said backrest comprising: a. a guide plate on said backrest having a slot therethrough extending generally parallel to said parallel motion linkage; and b. a guide pin fixed to said parallel motion linkage second portion and extending slidably through said slot.
Claim 4
Dependent Claim
34 words
A combination as set forth in claim 2 wherein said guide plate forms a wall of a recess in the side of said backrest, said parallel motion linkage being generally located in said recess.
Claim 5
Dependent Claim
35 words
A combination as set forth in claim 1 including a horizontal support arm pivoted to said parallel motion linkage second portion for movement in a horizontal plane, said tray being carried by said support arm.
Claim 6
Dependent Claim
24 words
A combination as set forth in claim 4 wherein said support arm includes a parallel motion linkage capable of movement in a vertical plane.
Claim 7
Dependent Claim
48 words
A combination as set forth in claim 1 including adjustable means at said parallel motion linkage first portion operable through said parallel motion linkage for adjusting said tray to a true horizontal position independent of the level orientation of said chair on the floor of a dental operatory.
Claim 8
Dependent Claim
60 words
A combination as set forth in claim 6 wherein said adjusting means comprises: a. a socket provided adjacent the rear of said seat frame; b. a ball member adjustably positioned in said socket; said ball having a upstanding member supporting said parallel linkage first portion; and c. lock means for fixing said ball in said socket in an adjusted position.
Claim 9
Dependent Claim
144 words
Dental apparatus comprising in combination: a. a dental chair having a seat frame and a backrest frame, said backrest frame being supported for deflection between an upright and a reclined position; b. a parallel motion linkage having a first portion supported by said seat frame and a second portion; c. a guide plate on said backrest frame having a slot therethrough extending generally parallel to said parallel motion linkage; d. a guide pin fixed to said parallel motion linkage second portion and extending slidably through said slot for rotating said second portion in concert with said backrest frame as the latter is deflected between an upright position and a reclined position; and e. a horizontally oriented tray member carried by said second portion and being maintained horizontally oriented by said parallel motion linkage as said second portion rotates in concert with said backrest frame.
Claim 10
Dependent Claim
144 words
Dental apparatus comprising in combination: a. a dental chair having a seat frame and a backrest frame, said backrest frame being supported for deflection between an upright and a reclined position; b. a parallel motion linkage having a first portion supported by said seat frame and a second portion; c. a guide plate on said backrest frame having a slot therethrough extending generally parallel to said parallel motion linkage; d. a guide pin fixed to said parallel motion linkage second portion and extending slidably through said slot for rotating said second portion in concert with said backrest frame as the latter is deflected between an upright position and a reclined position; and e. a horizontally oriented tray member carried by said second portion and being maintained horizontally oriented by said parallel motion linkage as said second portion rotates in concert with said backrest frame.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |