The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 1979
Filed:
Jan. 25, 1977
Martin Saupe, Mittelbiberach, DE;
Stefan Beier, Biberach, DE;
Kaltenbach & Voigt, Biberach, DE;
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 element being controlled by the respective switch means in order to vent the control chamber when one of the handpieces is removed from its holder so that the handpiece is ready to be supplied with pressure medium via the first passage and the second passage.