US3865341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental stool for dentist and dental assistant
Assignee: DEN-TAL-EZ DENTAL PRODUCTS CORP A CORP OF PA
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Filing: 1973-08-08
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Granted: 1975-02-11
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Expires: 1993-08-08
Abstract
Abstract The stool is provided with a self-contained source of fluid under pressure and has a seat structure vertically adjustable by manipulation of a single actuating lever mounted on and below the seat structure. The rate of fluid flow is valve controlled to provide for a rapid elevation of the unloaded seat structure and a slow descent of the loaded seat structure to a selected adjusted position. In the adjusted position the seat structure is automatically mechanically locked against vertical movement by simply releasing the actuating lever.
Inventors
- 👤 George A Fortnam
- 👤 Ivan E Sams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:17
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
In a dental stool including a base assembly, and a seat structure: a. means supporting the seat structure for adjustable vertical movement relative to said base assembly including an upright cylinder rigidly mounted on said base assembly centrally thereof, b. an elongated piston for said cylinder movable to extended and retracted positions relative to the upper end of said cylinder, c. means mounting said seat structure on the upper end of said piston for movement therewith, d. means movable with and secured to said seat structure in a concentrically spaced relation about said piston having an inner peripheral surface in bearing engagement with the outer peripheral surface of said cylinder, e. coacting means on said cylinder and on said movable means for releasably mechanically lockIng said movable means against movement longitudinally of said cylinder to hold said seat structure in a vertically adjusted position, and to rotatably support said movable means on said cylinder when the seat structure is in an adjusted position, f. means for releasing and actuating said coacting locking means including a manually operated lever pivotally supported on said seat structure, g. a source of fluid under pressure on said base assembly in fluid communication with said cylinder, and h. means for controlling the rate of fluid flow to and from said cylinder to vary the rate of retraction of said piston relative to the rate of extension thereof so that when the coacting locking means is released the seat structure with a person seated thereon is movable downwardly at a slower rate than the upward rate of movement thereof without a person seated thereon.
Claim 2
Dependent Claim
268 words
In a dental stool including a base assembly, and a seat structure: a. means supporting the seat structure for adjustable vertical movement relative to said base assembly including an upright cylinder rigidly mounted on said base assembly centrally thereof, b. an elongated piston for said cylinder movable to extended and retracted positions relative to the upper end of said cylinder, c. means mounting said seat structure on the upper end of said piston for movement therewith, d. means movable with and secured to said seat structure in a concentrically spaced relation about said piston having an inner peripheral surface in bearing engagement with the outer peripheral surface of said cylinder, e. coacting means on said cylinder and on said movable means for releasably mechanically lockIng said movable means against movement longitudinally of said cylinder to hold said seat structure in a vertically adjusted position, and to rotatably support said movable means on said cylinder when the seat structure is in an adjusted position, f. means for releasing and actuating said coacting locking means including a manually operated lever pivotally supported on said seat structure, g. a source of fluid under pressure on said base assembly in fluid communication with said cylinder, and h. means for controlling the rate of fluid flow to and from said cylinder to vary the rate of retraction of said piston relative to the rate of extension thereof so that when the coacting locking means is released the seat structure with a person seated thereon is movable downwardly at a slower rate than the upward rate of movement thereof without a person seated thereon.
Claim 3
Dependent Claim
116 words
In a dental stool according to claim 1 wherein: a. said movable means comprises a slidable cylindrical sleeve member having a side wall, and b. said coacting locking means includes a locking member mounted in said side wall for lateral movement to a first position projected inwardly of said inner peripheral surface and to a second position located outwardly of said inner peripheral surface, c. the outer peripheral surface of said cylinder formed with a series of vertically spaced indentations for selectively receiving said locking member in the first moved position therefor, d. said locking member being movable to said first position therefor in response to an actuation of said coacting locking means by said lever.
Claim 4
Dependent Claim
154 words
In a dental stool according to claim 2 wherein: a. said locking member constitutes a ball member having a diameter greater than the thickness of the side wall of said slidable sleeve member, and b. the means for releasing and actuating the coacting locking means includes an annular cam member mounted about said slidable sleeve member having a cam surface engageable with the ball member, and c. means movably connecting the annular cam member to said operating lever for longitudinal movement in one direction relative to said slidable sleeve member in response to a pivotal movement of said operating lever, said ball member on longitudinal movement of the cam member in said one direction being released for outward movement to the second position therefor, and on movement of the cam member in an opposite direction, being moved inwardly by said cam surface into a selected one of said indentations to the first position therefor.
Claim 5
Dependent Claim
35 words
In a dental stool according to claim 3, including: a. a spring means mounted in compression between said cam member and said seat structure for continuously yieldably urging said cam member in said opposite direction.
Claim 6
Dependent Claim
129 words
In a dental stool according to claim 1 wherein: a. said source of fluid under pressure includes a fluid reservoir arranged centrally of said base assembly, and said cylinder has a lower end section projected downwardly within said fluid reservoir, b. said control means including a valve plate mounted in a closing relation with the lower end of said cylinder to form with said piston an expansible chamber within said cylinder, c. said valve plate having an orifice extended therethrough to fluid connect said reservoir with said expansible chamber, and d. a one way valve unit in said valve plate providing for a uni-directional flow of fluid from said reservoir into said expansible chamber, said orifice having a cross-sectional area less than the crosssectional area of said valve unit.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |