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US4828167: Wax-pellet thermostat

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Filing Information

Inventor(s) Yoshikazu Kuze ·
Assignee(s) KUZE YOSHIKAZU ·
Attorney/Agent(s) Birch, Stewart, Kolasch & Birch ·
Primary Examiner William E. Tapolcai ·
Application Number US7060447
Filing date 06/11/1987
Issue date 05/09/1989
Predicted expiration date 06/11/2007
U.S. Classifications 236/345  · 236/100  ·
International Classifications F01P 702  ·
Kind CodeA
International Classifications 23634;34.5;100 ·
Foreign Priority JP61134821 - 06/12/1986 · JP61262744 - 11/06/1986 · JP62052883 - 03/10/1987 ·
9 Claims, No Drawings


Abstract

A wax-pellet thermostat having a valve seat, a piston secured to the valve, a guide member slidably mounted on the piston, a valve secured to the guide member, a diaphragm secured to the guide member, and a wax provided in the cylinder. A gap is provided in the guide member around the piston so as to accumulate coolant which has entered along the piston. The gap is provided to discharge the coolant from the guide member when the wax expands to cause a part of the diaphragm to enter into the gap.

Independent Claims | See all claims (9)

  1. 1. A thermostat comprising:a housing having a valve seat,a piston disposed within said housing,a guide member slidably mounted around said piston,a valve secured to said guide member for moving into and out of said valve seat,a coil spring for biasing said valve against said housing,a diaphragm secured to said guide member at a lower portion thereof, said diaphragm having an axial pocket for slidably receiving the lower portion of said piston,a heat conductive cylinder secured to said guide member and surrounding said diaphragm with a cavity,a seal member disposed at a top portion of said guide member around said piston so as to prevent the entrance of coolant between said guide member and said piston, andwax disposed in said cavity of said cylinder, said wax expanding when heated so as to cause said diaphragm and said guide member to slidably move upwards along said piston thereby moving said valve into said valve seat against the bias of said coil spring,wherein said guide member and said seal spool are arranged so as to form a gap between said guide member and said diaphragm, and around said piston when said wax is in a cooled and unexpanded state, said gap having a predetermined capacity so as to accumulate coolant which may enter between said guide member and said piston through said seal member due to the vacuum generated in said diaphragm, and wherein said guide member and said diaphragm are arranged to discharge accumulated coolant from said guide member when said wax is in a heated and expanded state, said discharge being caused by a part of said diaphragm entering into and filling said gap, said seal member being arranged so as to allow for the discharge of coolant from said gap.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2694415 WATTS REGULATOR CO Dillon Nov 1954
US2769597 BISHOP & BABCOCK MFG COMPANY Mayo Nov 1956
US3149455 RANCO INC Daly et al. Sep 1964
US3841551 NIPPON DENSO CO Ota Oct 1974
US4175696 Braukmann Armaturen AG Braukmann Nov 1979
US4187683 Century Brass Products, Inc. Northrup, Jr. et al. Feb 1980

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
FR2255826VERNET EXPLOIT PROCEDESJul 1975

Referenced By