Dental chair headrest locking device
US4111484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Jul 25, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G15/125
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A headrest mounted above a dental chair backrest can readily be positioned by means of a headrest bar engaging a locking device affixed to the chair backrest. The locking device comprises a pair of resilient rubber surfaces or other high friction material surfaces which grip or contact the headrest bar to positively lock the headrest in position. By merely pushing the headrest to a more vertical position, the headrest bar is caused to lose contact with the gripping surfaces. A spring-loaded block is selectively disposed through each of the high friction surfaces to urge the bar in stronger contacting relation with said high friction surfaces in any operating position of the headrest, the blocks themselves also providing low friction surfaces against which the bar may ride when the headrest is being repositioned by initially pushing it to a more vertical position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.