US3820844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step attachment for a dental stool
Assignee: DEN-TAL-EZ DENTAL PRODUCTS CORP A CORP OF PA
•
Filing: 1973-04-30
•
Granted: 1974-06-28
•
Expires: 1993-04-30
Abstract
Abstract The step attachment comprises a plate member adapted to extend radially from the center post of a dental stool in an overlying relation with the stool base, which carries floor engaging caster wheels. The plate member is movably supported at the lower end of the post for rotational movement about the post and for pivotal up and down movement of its outer end. A leg member at the outer end of the plate member is normally yieldably held out of engagement with the floor whereby the stool is freely movable along the floor and the plate member fully rotatable about the post. When the plate member is stepped on the leg member is moved into bearing engagement with the floor to hold the stool against floor movement.
Inventors
- 👤 G Fortnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:42
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/50; A47C7/52; A47C7/506; A61; A61B; A61B90/00; A61B90/60; A61G; A61G15/00; A61G15/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
A step attachment for a dental stool having a vertical standard mounted on a base provided with floor engaging caster wheels; said attachment comprising: a. a substantially horizontal plate overlying said base having an inner end portion adjacent said vertical standard, and an outer end portion projected outwardly from said base, b. a floor engaging leg means secured to and projected downwardly from said outer plate portion, c. means movably supporting the inner end of said plate member on said vertical standard for rotational movement of the plate about the vertical axis of said standard, and for up and down pivotal movement of said outer portion about a horizontal axis extended transversely of said vertical axis, and d. coacting means on said base and on said plate for yieldably urging said plate to an upper pivotally moved position wherein said leg means are in a clearance relation with the floor, e. said leg means, when said plate is stepped upon, being movable into bearing engagement with the floor surface to rigidly support the plate against downward pivotal movement and to lock said stool against floor movement.
Claim 2
Dependent Claim
186 words
A step attachment for a dental stool having a vertical standard mounted on a base provided with floor engaging caster wheels; said attachment comprising: a. a substantially horizontal plate overlying said base having an inner end portion adjacent said vertical standard, and an outer end portion projected outwardly from said base, b. a floor engaging leg means secured to and projected downwardly from said outer plate portion, c. means movably supporting the inner end of said plate member on said vertical standard for rotational movement of the plate about the vertical axis of said standard, and for up and down pivotal movement of said outer portion about a horizontal axis extended transversely of said vertical axis, and d. coacting means on said base and on said plate for yieldably urging said plate to an upper pivotally moved position wherein said leg means are in a clearance relation with the floor, e. said leg means, when said plate is stepped upon, being movable into bearing engagement with the floor surface to rigidly support the plate against downward pivotal movement and to lock said stool against floor movement.
Claim 3
Dependent Claim
79 words
The step down attachment for a dental stool according to claim 1 wherein: a. said base includes a plurality of feet members extended radially from said vertical standard, and b. said coacting means includes a ring member concentric with said vertical axis supported on and secured to the upper surfaces of said feet members, and c. a spring member secured to the under side of said plate in slidable contact engagement with the upper surface of said ring member.
Claim 4
Dependent Claim
95 words
The step down attachment for a dental stool according to claim 1 wherein: a. said supporting means includes a rotatable ring member positioned about the lower end of said standard and rotatable about said vertical axis, b. a pair of transversely spaced arm members projected longitudinally outwardly from the inner end portion of said plate to opposite sides of said rotatable ring, and c. pivot means pivotally connecting said arm members on said rotatable ring at positions equidistant from said vertical axis to provide for the pivotal movement of said plate about said horizontal axis.
Claim 5
Dependent Claim
29 words
The step down attachment for a dental stool according to claim 2 wherein: a. said leg means includes a pair of leg members spaced transversely of said plate member.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |