US3917203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movable working chair, particularly for dentists
Assignee: Siemens AG
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Filing: 1973-11-13
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Granted: 1975-11-04
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Expires: 1993-11-13
Abstract
Abstract A movable working chair, particularly for dentists, has an operating device working against restoring means and moving the chair when it is loaded from a ''''moving position'''' into a ''''braking position'''' and moving the chair when it is unloaded from the ''''braking position'''' into the ''''moving position''''. The invention is particularly characterized by a stop device released by hand or foot by means of which the operating device can be stopped in the ''''moving position''''.
Inventors
- 👤 Erich Heubeck
- 👤 Ernst-August Behne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:54
CPC Classifications
B; B60; B60B; B60B33/00; B60B33/0078; B60B33/0089; A; A47; A47C; A47C7/00; A47C7/002; A47C7/006; A47C9/00; A47C9/02; A47C9/022; A61; A61B; A61B90/00; A61B90/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A movable working chair, particularly for dentists, comprising a base having means for rolling the chair along the floor, a seat and a support member carrying said seat, brake means connected to said support member for movement from a release position wherein brake means is spaced from the floor to a braking position wherein the brake means engage the floor in response to loading of said seat, restoring means for moving said brake means from the braking position to the release position in response to unloading of said seat, and stop means movable between a retracted and extended position for selectively blocking movement of said brake means, and stop means in said retracted position permitting movement of said brake means between said braking and release positions, and in said extended position permitting movement of said brake means only from said braking position to said release position, said stop members having connected thereto manually operable preselecting means for biasing said stop means into either one of said retracted and extended positions irrespective of the position of said brake means and the seat''s load.
Claim 2
Dependent Claim
182 words
A movable working chair, particularly for dentists, comprising a base having means for rolling the chair along the floor, a seat and a support member carrying said seat, brake means connected to said support member for movement from a release position wherein brake means is spaced from the floor to a braking position wherein the brake means engage the floor in response to loading of said seat, restoring means for moving said brake means from the braking position to the release position in response to unloading of said seat, and stop means movable between a retracted and extended position for selectively blocking movement of said brake means, and stop means in said retracted position permitting movement of said brake means between said braking and release positions, and in said extended position permitting movement of said brake means only from said braking position to said release position, said stop members having connected thereto manually operable preselecting means for biasing said stop means into either one of said retracted and extended positions irrespective of the position of said brake means and the seat''s load.
Claim 3
Dependent Claim
164 words
A working chair according to claim 1, wherein said support member comprises a supporting post carried by said base and vertically movable therein, said post having a lower end adapted to engage the floor for braking the chair, said stop means comprising a notched bolt extending substantially radially to said post to engage and disengage with said post, a pin slidably engaging said bolt, a first resilient means positioned between said pin and said bolt for urging said bolt into the extended position and a second resilient means positioned between said bolt and said base for urging said bolt into retracted position, said preselecting means having a first setting for enabling said first resilient means to overcome the urging of said second resilient means, whereby said bolt is biased toward said extended position, said preselecting means having a second setting for enabling said second resilient means to overcome the urging of the first resilient means, whereby said bolt is biased toward said retractable position.
Claim 4
Dependent Claim
41 words
A working chair according to claim 2, wherein said preselecting means comprises a swingable lever and an excentrically mounted disc connected with said lever and having an outer surface engaging said pin for changing the compression of said first resilient means.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |