Electric kettle with independently detachable subassemblies

• US 4,455,476 A
• Filed: 11/20/1981
• Issued: 06/19/1984
• Est. Priority Date: 12/19/1980
• Status: Expired due to Fees

• Current Assignee: D.H. Haden Ltd. (Spectrum Brands Holdings, Inc.)
• Original Assignee: D H Haden Limited
• Inventors: Haden, Denis H.
• Primary Examiner(s): Reynolds, B. A.
• Assistant Examiner(s): Evans, Geoffrey S.
• Application Number:
  US06/323,627
• Time in Patent Office: 942 Days
• Field of Search: 219/328, 219/330, 219/331-332, 219/335, 219/337, 219/437, 219/441, 219/442, 219/512, 337/380, 337/386, 99/282
• US Class Current: 392/447
• CPC Class Codes: A47J 27/21116 specially adapted for detecting boiling of the water A47J27/21125 takes precedence
• CPC Class Codes: H05B 3/04 Waterproof or air-tight seals for heaters

Abstract

A switch unit for an electric kettle or other heating apparatus which is easy to assemble and repair. The switch unit includes a steam responsive mechanism 18 which is mounted on a body 80 which is in turn mounted by an adjustable clamp 31, 35 on a head part 32 of an immersion heater 12 so that the steam responsive mechanism can be moved relative to the immersion heater 12 for alignment with a handle 11 and steam vent 33. The switch unit includes a second assembly 16 which is mounted in a socket in the heating element 12 independently of the first assembly. In a preferred embodiment the first assembly and the cover 15 are designed to allow the second assembly including the switch contacts and electrical connections to be removed from the kettle without disturbing the steam responsive meachanism 18 or the cover 15.

Claims

1. A vessel for heating liquids, comprising:

(a) a wall, an immersion heater, and switch means,

(b) the immersion heater having a head secured to said wall,

(c) the switch means comprising a first assembly and a second assembly, the first assembly including a steam responsive mechanism mountd on a body means and the second assembly including a dry overload responsive actuating mechanism, a switch actuating member and a carrier,

(d) the carrier carries live and neutral electrical supply connectors, switch contacts, and conductors to connect electrically the connectors and the switch contacts with cold tails of the immersion heater,

(e) the second assembly is secured to the head of the immersion heater,

(f) the first assembly is secured to the head independently of the second assembly by a clamping assembly,

(g) the clamping assembly including means to support the first assembly for arcuate movement about a predetermined axis relative to the head and the second assembly,

(h) said clamping assembly including means to secure the first assembly non-rotatably to the head, and

(i) the steam responsive mechanism including a movable part which cooperates with said switch actuating member to be effective to open said contacts when the steam responsive mechanism responds to being subjected to steam.

2. A vessel as defined in claim 1 wherein

the clamping support means includes a clamping member engaging the head to clamp the head to the wall of the vessel around an aperture provided in the wall to receive the head, and

said body means includes at least one clamp abutment member which is engageable with the clamping member.

3. A vessel as defined in claim 2 wherein

the clamping member has an external flange which is engaged by the clamp abutment member,

said abutment member has an annular clamp abutment face on a rear end portion, and

said body means has a lower ring portion with a clamp abutment surface which is clamped to the clamp abutment face.

4. A vessel as defined in claim 1 wherein the body means has a lower portion which is arranged to permit the second assembly to be removed from the head without releasing the clamping assembly.

5. A vessel as defined in claim 4 wherein

said steam responsive mechanism includes a pivotally mounted lever and

said movable part of the steam responsive mechanism is detachably mounted on said pivotally mounted lever.

6. A vessel as defined in claim 4 wherein

a cover and a plastics member define a plug socket,

the cover is apertured to enable the second assembly and the plastics member to be removed without detaching the cover.

7. A vessel as defined in claim 6 wherein

the second assembly includes a cylindrical portion which extends through said wall,

the clamping assembly clamps the immersion heater to said wall of the vessel, and

said vessel includes a handle with said cover said adapted to cooperate with said handle.

8. A vessel as defined in claim 2 wherein

said immersion heater head includes a main panel,

the immersion heater includes a heating element secured to said immersion heater head,

said heating element includes cold tails which extend through said main panel of said head,

said head includes an externally threaded cylindrical portion having a peripheral flange around a junction between the main panel and the cylindrical portion,

said main panel has faster means clamping the second assembly to the main panel,

the clamping member has an external flange portion and is internally threaded to engage the externally threaded cylindrical portion of the head, and

the clamp abutment member has an internal flange engageable with said external flange portion,

said abutment member being secured to the body means by fasteners so as to hold the body means against an end of the clamping member.