Dental units
US4151647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Jan 25, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C1/0038
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dental unit having pressure-medium operated handpieces, a holder for each handpiece, a control unit operable to control the supply of pressure medium to each handpiece, and switch means associated with each holder and with said control unit, each switch means being operable upon removal of the respective handpiece from its holder to initiate operation of the control unit for the supply of pressure medium to the handpiece. The control unit comprises a control block corresponding to each handpiece, a first passage extending through the control blocks to supply pressure medium for operating the handpieces, a second passage in each control block communicating with a respective handpiece, a diaphragm controlling the communication between the first passage and each second passage, a control chamber controlling the operation of the diaphragm, the control chamber being charged with control pressure medium in order to move the diaphragm to a position blocking communication between the first passage and the respective second passage, a venting arrangement for venting each control chamber, and an electrically operated closure element cooperating with each venting arrangement, the closure el…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.