Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Having oscillating or reciprocating valve
Patent
1992-07-21
1993-04-27
Tapolcai, William E.
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Having oscillating or reciprocating valve
74411, 137606, 251 81, G05D 2313
Patent
active
052054829
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sanitary mixing unit in the form of a single thermostat with a cold water and a hot water inlet and a mixed water outlet and with valves for shut-off and flow control arranged in the direction of flow before the thermostat control and thus before the mixing chamber, the valves being actuatable simultaneously via a spindle, whereby the movable valve closing members are fine adjustable independent from one another relative to the corresponding valve seats for a secure shut-off.
Mixing units of the aforementioned kind are known from German Patent 23 55 101. A so called control axle in the form of a spindle is provided on which two valve cones functioning as valve closing members for the shut-off and flow control of the cold and the hot water are arranged whereby one of the valve cones is adjustable relative to the control axle. Due to such an arrangement, a fine adjustment of the valve cones relative to the corresponding valve seats may be performed independent from one another at any time if a secure shut-off is not or no longer possible; however, for such a fine adjustment a demounting of the shut-off and flow regulating handle as well as the use of tools is necessary.
It is therefore an object of the invention to eliminate this disadvantage and to provide a sanitary mixing unit of the aforementioned kind in which a possible fine adjustment of the movable valve closing members occurs automatically during shut-off of the mixing unit.
SUMMARY OF THE INVENTION
This object is inventively solved essentially by providing the spindle as a central spindle and by providing a toothed wheel at its end section facing the valves which is engaged by two spur gears which are cooperating via a slide coupling with two individual spindles for the valves.
The thermostat-controlled sanitary mixing unit according to the present invention comprises essentially a thermostat control; a flow control comprised of a central spindle and a cold water inlet and a hot water inlet, and further comprising a first valve connected to the cold water inlet and a second valve connected to the hot water inlet, the first and the second valves serving to shut off and control water flow, the spindle simultaneously activating the first and second valves; the first and the second valves each comprising a movable valve closing member and a valve seat, the valve closing members being fine adjustable relative to the corresponding valve seat independent of one another for a secure shut-off; the central spindle comprising a toothed wheel that is fixedly attached to one end of the central spindle facing the valves; and each valve comprising a single spindle connected with one end to the valve for activating the valve, the single spindle comprising a bearing ring fixedly connected to a free end of the spindle and a spur gear connected to the bearing ring so as to be movable relative to the bearing ring, the spur gear engaging the toothed wheel, with the bearing ring and the spur gear forming a slip coupling.
It is expedient that the bearing ring has an outer collar and the spur gear has an inner collar, the inner collar of the spur gear resting on said outer collar of the bearing ring. The mixing unit further comprises a spring ring cooperating with the inner collar, and the bearing ring further comprises a peg for supporting the spring ring and for pressing with that spring ring the inner collar against the outer collar for effecting the slip coupling.
Preferably, the peg has an outer beaded edge for holding and supporting the spring ring.
From U.S. Pat. No. 2,332,995 as well as from British patent GB-A-492 052 sanitary mixing units are already known which have valves within the cold and hot water inlets equipped with spur gears cooperating with a toothed wheel of a central spindle for controlling water flow. The U.S. patent also shows a thermostat-controlled mixing unit. However, the connection for achieving this cooperation is permanent such that in any operational condition a form-locking connec
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patent: 2575305 (1951-11-01), Stryzakowski et al.
patent: 3002531 (1961-10-01), Katra
patent: 3011721 (1961-12-01), Wiltz
patent: 3105371 (1963-10-01), Forrest
Ideal-Standard GmbH
Tapolcai William E.
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