Latching mechanism for an appliance door

• US 6,390,518 B1
• Filed: 08/15/2000
• Issued: 05/21/2002
• Est. Priority Date: 08/15/2000
• Status: Expired due to Fees

• Current Assignee: Maytag Corporation (Whirlpool Corporation)
• Original Assignee: Maytag Corporation (Whirlpool Corporation)
• Inventors: Elick, Robert A.
• Primary Examiner(s): Matecki, Kathy
• Assistant Examiner(s): Lugo, Carlos
• Application Number:
  US09/637,379
• Time in Patent Office: 644 Days
• Field of Search: 292/216, 292/DIG.69, 292/214, 292/117, 292/220, 292/223, 292/196, 292/198, 292/122, 292/123, 292/96, 292/97, 292/DIG.24, 292/DIG.41
• US Class Current: 292/216
• CPC Class Codes: A47L 15/4259 Arrangements of locking or security/safety devices for doors, e.g. door latches, switch to stop operation when door is open
• CPC Class Codes: E05B 17/22 Means for operating or controlling lock or fastening device accessories, i.e. other than the fastening members, e.g. switches, indicators E05B39/00 - E05B45/00 take precedence
• CPC Class Codes: E05B 2047/0068 Door closed
• CPC Class Codes: E05C 3/24 in the form of a bifurcated member automatic catches with a bifurcated latch E05C19/024; locks with a bifurcated bolt E05B65/0046, E05B85/243
• CPC Class Codes: Y10S 292/24 Dogging mechanism from inside operating means
• CPC Class Codes: Y10S 292/41 Door latch separation prevention
• CPC Class Codes: Y10S 292/69 Washing machine or stove closure latch
• CPC Class Codes: Y10T 292/0922 Operating means
• CPC Class Codes: Y10T 292/0928 Operating means
• CPC Class Codes: Y10T 292/0929 Link and lever
• CPC Class Codes: Y10T 292/0945 Operating means
• CPC Class Codes: Y10T 292/0946 Link and lever
• CPC Class Codes: Y10T 292/1045 Operating means
• CPC Class Codes: Y10T 292/1047 Closure
• CPC Class Codes: Y10T 292/1052 Operating means
• CPC Class Codes: Y10T 292/1055 Link and lever
• CPC Class Codes: Y10T 292/1076 Link and lever
• CPC Class Codes: Y10T 292/1078 Closure

Abstract

A mechanism for use in latching a pivotable access door of a cabinet includes a latch housing within which is rotatably mounted a catch member between latching and unlatching positions upon a carrier which, in turn, is rotatably supported in the latch housing. The carrier is biased into engagement with a cam pin which acts as a pivot stop for the carrier. A cross pin extends through a pair of laterally spaced slots formed in the latch housing and terminal ends of the cross pin are adapted to depress electronic switches through movement of the carrier when the latching mechanism assumes the latched position. The catch member is rotated to the latching position upon engagement with a latch striker and can be rotated to release the latch striker, in accordance with various embodiments of the invention, either through the use of a handle or upon tugging on the access door.

Claims

1. In a cabinet provided with an access opening and a pivotable door adapted to extend across and close the access opening, a mechanism for latching the pivotable door in a closed position comprising:

a latch housing mounted to one of the door and the cabinet, said latch housing including an opening therein and being provided with a pair of laterally spaced slots wherein the opening in the latch housing includes a beveled portion about a periphery thereof;

a cross pin supported by the latch housing, said cross pin having terminal end portions which project into the slots, wherein an axis defined by the cross pin is movable, within the slots, relative to the latch housing;

a catch member movably mounted relative to the latch housing between latching and receiving positions, said catch member being formed with a camming surface defining at least first and second detent positions, said catch member being shiftable relative to the latch housing upon shifting of the axis defined by the cross pin;

a cam pin extending across a portion of the latch housing, said cam pin being adapted to be received in the first detent position when the latching mechanism assumes an unlatched position and in the second detent position when the latching mechanism assumes a latched position; and

a striker element mounted to another of the door and the cabinet, said striker element being adapted to be guided by the beveled portion and project into the opening of the latch housing and abut the catch member to cause shifting of the catch member from the receiving position to the latching position upon closing of the door in order to reposition the cam pin from the first detent position to the second detent position.

2. In a cabinet provided with an access opening and a pivotable door adapted to extend across and close the access opening, a mechanism for latching the pivotable door in a closed position comprising:

a latch housing mounted to one of the door and the cabinet, said latch housing including an opening therein;

a catch member movably mounted relative to the latch housing between latching and receiving positions, said catch member being formed with a camming surface defining at least first and second detent positions;

a cam pin extending across a portion of the latch housing, said cam pin being adapted to be received in the first detent position when the latching mechanism assumes an unlatched position and in the second detent position when the latching mechanism assumes a latched position; and

a striker element mounted to another of the door and the cabinet, said striker element being adapted to project into the opening of the latch housing and abut the catch member to cause shifting of the catch member from the receiving position to the latching position upon closing of the door in order to reposition the cam pin from the first detent position to the second detent position.

3. The latching mechanism according to claim 2, wherein the catch member is independently rotatable about a first axis and shiftable relative to the latch housing.

4. The latching mechanism according to claim 3, wherein said catch member is shiftable relative to the latch housing by pivoting about a second axis which is spaced from the first axis.

5. The latching mechanism according to claim 4, further comprising:

a carrier rotatably attached to the latch housing.

6. The latching mechanism according to claim 5, wherein the carrier is shiftable in unison with the catch member relative to the latch housing.

7. The latching mechanism according to claim 6, further comprising:

a cross pin movably supported by the latch housing, said catch member being shiftable relative to the latch housing upon shifting of the cross pin.

8. The latching mechanism according to claim 7, further comprising:

at least one spring, interposed between the latch housing and the carrier, for biasing the latching mechanism to the latched position.

9. The latching mechanism according to claim 7, wherein the latch housing is provided with a pair of spaced slots and the cross pin has terminal end portions which project into the slots, wherein the cross pin is movable relative to the latch housing within the slots.

10. The latching mechanism according to claim 9, further comprising:

at least one switch mounted to the latch housing, said switch including an actuating member adapted to be engaged by the cross pin.

11. The latching mechanism according to claim 9, further comprising:

a handle adapted to abut and pivot the carrier.

12. The latching mechanism according to claim 11, wherein the handle is pivotably mounted about an axis defined by the cross pin.

13. The latching mechanism according to claim 12, wherein, when shifting from the latched position to the unlatched position, movement of the handle initially causes shifting of the cross pin in said slots prior to rotating of the catch member relative to the housing.

14. The latching mechanism according to claim 2, wherein the opening in the latch housing includes a beveled portion about a periphery thereof for guiding the striker element therein.

15. In a cabinet provided with an access opening and a pivotable door adapted to extend across and close the access opening, a mechanism for latching the pivotable door in a closed position comprising:

a latch housing mounted to one of the door and the cabinet, said latch housing including an opening therein and being provided with a pair of laterally spaced slots;

a cross pin supported by the latch housing, said cross pin having terminal end portions which project into the slots, wherein an axis defined by the cross pin is movable, within the slots, relative to the latch housing;

a catch member movably mounted relative to the latch housing between latching and receiving positions, said catch member being shiftable relative to the latch housing upon shifting of the axis defined by the cross pin; and

a striker element mounted to another of the door and the cabinet, said striker element being adapted to project into the opening in the latch housing and abut the catch member to cause shifting of the catch member from the receiving position to the latching position upon closing of the door.

16. The latching mechanism according to claim 15, further comprising:

at least one switch mounted to the latch housing, said switch including an actuating member adapted to be engaged by the cross pin.

17. The latching mechanism according to claim 15, further comprising:

a carrier rotatably attached to the latch housing, said catch member being rotatably supported by the carrier, wherein the catch member is shiftable in unison with the carrier relative to the latch housing.

18. The latching mechanism according to claim 17, further comprising:

at least one spring, interposed between the latch housing and the carrier, for biasing the latching mechanism to the latched position.

19. The latching mechanism according to claim 18, further comprising:

a handle adapted to abut and pivot the carrier.

20. The latching mechanism according to claim 19, wherein the handle is pivotably mounted about the axis defined by the cross pin.

21. The latching mechanism according to claim 20, wherein, when shifting from the latched position to the unlatched position, movement of the handle initially causes shifting of the cross pin in said slots prior to rotating of the catch member relative to the housing.

22. The latching mechanism according to claim 15, wherein the opening in the latch housing includes a beveled portion about a periphery thereof for guiding the striker element therein.

23. In a cabinet provided with an access opening and a pivotable door adapted to extend across and close the access opening, a mechanism for latching the pivotable door in a closed position comprising:

a latch housing mounted to one of the door and the cabinet, said latch housing including an opening therein, wherein the opening in the latch housing includes a beveled portion about a periphery thereof;

a catch member movably mounted relative to the latch housing between latching and receiving positions; and

a striker element mounted to one of the door and the cabinet, said striker element being guided by the beveled portion into the opening of the latch housing to abut the catch member and cause shifting of the catch member from the receiving position to the latching position upon closing of the door.

24. The latching mechanism according to claim 23, wherein the entire periphery of said opening tapers inwardly.

25. The latching mechanism according to claim 23, further comprising:

a carrier rotatably attached to the latch housing, said catch member being rotatably supported by the carrier, wherein the catch member is shiftable in unison with the carrier relative to the latch housing.

26. The latching mechanism according to claim 25, further comprising:

a cross pin movably supported by the latch housing, said catch member being shiftable relative to the latch housing upon shifting of the cross pin.

27. The latching mechanism according to claim 26, wherein the carrier is shiftable in unison with the catch member relative to the latch housing.

28. The latching mechanism according to claim 26, wherein the latch housing is provided with a pair of spaced slots and the cross pin has terminal end portions which project into the slots, wherein the cross pin is movable relative to the latch housing within the slots.

29. The latching mechanism according to claim 28, further comprising:

at least one switch mounted to the latch housing, said switch including an actuating member adapted to be engaged by the cross pin.

30. The latching mechanism according to claim 28, further comprising:

a handle adapted to abut and pivot the carrier.

31. A method of latching a pivotable access door in a closed position comprising:

causing a striker member to engage and rotate a catch member about a first axis defined within a latch housing; and

shifting the catch member relative to the latch housing about a second axis, which is spaced from the first axis, in order to retain the striker member within the latch housing.

32. The method of claim 31, further comprising:

guiding the striker member into a latch housing along a beveled peripheral portion of an opening formed in the latch housing.

33. The method of claim 31, further comprising:

shifting the second axis relative to the latch housing upon latching of the pivotable access door.

34. The method of claim 33, further comprising:

pivoting a carrier, which rotatably supports the catch member about the first axis, following receipt of the striker within the latch housing; and

actuating an electrical switch based on the pivoting of the carrier.

35. The method of claim 34, further comprising:

delaying the actuating of the electrical switch until the striker member is fully retained by the catch member.

36. The method of claim 31, further comprising:

biasing the catch member towards an unlatching position.