Mixer unit with thermostat-controlled valves

• US 4,116,377 A
• Filed: 02/11/1977
• Issued: 09/26/1978
• Est. Priority Date: 02/16/1976
• Status: Expired due to Term

• Current Assignee: MAJ Andersson Arkitektkontor AB
• Original Assignee: MAJ Andersson Arkitektkontor AB
• Inventors: Lagher, Gunnar, Andersson, Maj
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US05/767,689
• Time in Patent Office: 592 Days
• Field of Search: 236/12 R, 236/12 Q, 236/12 A, 236/101 A, 137/90, 137/636, 251/43, 251/38
• US Class Current: 236/12.1
• CPC Class Codes: G05D 23/136 with pressure equalizing means

Abstract

A mixer unit with thermostat controlled valves for mixing hot and cold liquid includes a housing with valves for supplying the hot and cold liquid to the housing. The housing includes a mixing chamber which terminates in a discharge spout. A yoke is rockably mounted in the housing and the ends are arranged to make contact with and actuate the valves for the hot and cold liquid. A bimetallic spiral control thermostat is carried in the discharge spout and cooperates with the yoke for causing rocking movement of the yoke when the thermostat spirally moves in response to regulation of the thermostat. A device is carried at the outer end of the discharge spout for adjusting the position of the spiral of the thermostat about its axis of symmetry and thereby regulating the desired temperature of the mixed liquid.

Claims

1. A mixer unit with thermostat-controlled valves for mixing hot and cold liquid comprising a housing, valves for supplying hot and cold liquid to said housing, a yoke rockably mounted in the housing, the ends of which actuate the valves for hot and cold liquid respectively, said valves for hot and cold liquid comprising cylinders having outlet openings, pistons carried in said cylinders and sealed by means of cup packings, the position of said pistons within said cylinders being movable to a suitable position for a certain mixture relationship between the liquids, by rocking movement of said yoke, and a bimetal spiral control thermostat for causing said rocking movement of said yoke upon regulation of said thermostat.

2. A mixer unit with thermostat-controlled valves for mixing hot and cold liquid comprising a housing, valves for supplying hot and cold liquid to said housing, a yoke rockably mounted in the housing and the ends of said yoke actuating the valves for hot and cold liquid respectively, and a bimetal spiral control thermostat for causing rocking movement of said yoke upon regulation of said thermostat, said valves for hot and cold liquid comprising cylinders having outlet openings, pistons carried in said cylinders and sealed by means of cup packings, the position of said pistons within said cylinders being determined by the movement of the yoke to a suitable position for a certain mixture relationship between the liquids, said pistons being tubular and provided with first holes at the bottom ends thereof of substantially smaller diameter than the inside diameter of the pistons, and being provided with second holes at the top ends thereof of smaller diameter than said inside diameter, each piston having at least one radial hole for communication between its hollow center and an existing annular space between the piston and the surrounding cylinder.

3. The mixer unit according to claim 2 wherein the ends of the yoke intended for sealing against the top ends of the pistons are provided with rubber inserts.

4. The mixer unit according to claim 3 further comprising a mixing chamber in said housing which terminates in a discharge spout wherein said outlet openings in said valve cylinders discharge into said mixing chamber.

5. The mixer unit according to claim 4 wherein said control thermostat is located in the discharge spout.

6. The mixer unit according to claim 5, further comprising a ring rotatably carried at the mouth of the discharge spout, said ring being connected by a stud which is inclined by a varying amount as the ring turns to thereby move the control thermostat about its axis of symmetry.