Convertible motorized latch

• US 8,403,376 B2
• Filed: 09/26/2007
• Issued: 03/26/2013
• Est. Priority Date: 06/12/2007
• Status: Active Grant

• Current Assignee: CompX International Incorporated
• Original Assignee: CompX International Incorporated
• Inventors: Greiner, Matthew R., Kaczmarz, Kenneth A., Mlynarczyk, Mitchell S., Graw, Kenneth D., Zimmerman, Francis H.
• Primary Examiner(s): Lugo, Carlos
• Assistant Examiner(s): WILLIAMS, MARK A
• Application Number:
  US11/904,297
• Publication Number:
  US 20080307837A1
• Time in Patent Office: 2,008 Days
• Field of Search: 292/144, 292/170, 292/169.14, 292/169.19, 292/172
• US Class Current: 292/144
• CPC Class Codes: E05B 2047/002 Geared transmissions
• CPC Class Codes: E05B 2047/0024 Cams
• CPC Class Codes: E05B 2047/0069 bolt position
• CPC Class Codes: E05B 47/0012 with rotary electromotors actuators with rotary electromotors per se H02K7/06, H02K23/68
• CPC Class Codes: E05B 63/0065 Operating modes; Transformable to different operating modes
• CPC Class Codes: Y10T 292/0962 Operating means
• CPC Class Codes: Y10T 292/097 Operating means
• CPC Class Codes: Y10T 292/0976 Sliding cam
• CPC Class Codes: Y10T 292/0977 Cam
• CPC Class Codes: Y10T 292/0982 Bolt blocking or disabling means
• CPC Class Codes: Y10T 292/0993 Gear
• CPC Class Codes: Y10T 292/1021 Motor
• CPC Class Codes: Y10T 292/62 Bolt casings
• CPC Class Codes: Y10T 70/7124 Retracted electrically only

Abstract

Disclosed is a convertible motorized latch that may be configured in either of a slam latch or a dead bolt latch configuration, just by desired selection and replacement of a minimal number of components, and which may be used on new (oem) equipment or in retrofit applications. In either preferred configuration, an electric motor contained within the latch housing operates to open or unlock the latch. Latch closure may be provided by spring actuation in a slam configuration or by further motor operation in a dead bolt configuration. Either present configuration may make use of an electrical feedback switch for signaling latch retraction while the dead bolt configuration may also include a second electrical feedback switch for signaling latch extension. A gear train may be incorporated within the latch housing to provide reduced speed and increased torque from the electric motor.

Claims

1. A convertible latch configured for selective assembly in either of a slam latch configuration or a dead bolt latch configuration, the convertible latch comprising:

a housing configured to accept a latch bolt;

a latch bolt mounted at least partially within said housing for one of selected extension from said housing and retraction into said housing;

a drive mechanism configured to selectively retract said latch bolt into said housing, said drive mechanism comprising an electrically operated drive mechanism including an electrically operated motor and an associated drive mechanism output, said drive mechanism output comprising a gear train, an output cam, an output cam pin, a slide engageable with said latch bolt, and a slide tab coupled to said slide, said slide tab configured for engagement with said cam pin, such that operation of said electrically operated drive mechanism permits movement of said cam pin to contact said slide tab to retract said latch bolt; and

at least one electrical switch mounted within said housing and positioned such that said switch is actuated by said latch bolt upon retraction of said latch bolt into said housing;

wherein, when in the slam latch configuration, said latch bolt selectively comprises a slam latch bolt having an angled cam surface, and, when in the dead bolt latch configuration, said latch bolt selectively comprises a dead latch bolt.

2. A convertible latch as in claim 1, further comprising an electrical connector mounted to said housing, said electrical connector providing electrical connections to said electrically operated drive mechanism and said at least one electrical switch.

3. A convertible latch as in claim 1, further comprising a latch bolt extension portion configured to extend said latch bolt at least partially from said housing.

4. A convertible latch as in claim 3, wherein said latch bolt is a slam latch bolt and said latch bolt extension portion comprises a spring coupled to said slam latch bolt and charged by retraction of said slam latch bolt into said housing.

5. A convertible latch as in claim 4, in combination with a cabinet having an alternately openable and closeable door thereof and on which door said convertible latch is supported, and such cabinet having an associated strike plate supported on a frame thereof and interoperative with the angled cam surface of said slam latch bolt for permitting alternate opening and closing of such cabinet door.

6. A convertible latch as in claim 4, wherein operation of said electrically operated drive mechanism permits movement of said cam pin to contact said slide tab to retract said slam latch bolt and release said slide tab, so as to permit extension of said slam latch bolt by said spring.

7. A convertible latch as in claim 3, wherein said latch bolt is a dead latch bolt and said latch bolt extension portion comprises a coupling to said drive mechanism output.

8. A convertible latch as in claim 7, in combination with a cabinet having an alternately openable and closeable door thereof and on which door said convertible latch is supported, and such cabinet having an associated recessed area formed in a frame thereof and interoperative with said dead latch bolt of said convertible latch for permitting alternate opening and closing of such cabinet door.

9. A convertible latch as in claim 7, further comprising a second electrical switch mounted within said housing and positioned such that said switch is actuated by said dead latch bolt upon extension of said dead latch bolt from said housing.

10. A convertible latch as in claim 9, further comprising an electrical connector mounted to said housing, said electrical connector providing electrical connections to said electrically operated drive mechanism, said at least one electrical switch and said second electrical switch.

11. A convertible latch as in claim 9, wherein operation of said electrically operated drive mechanism permits movement of said cam pin to contact said slide tab to retract and extend said dead latch bolt.

12. A convertible latch kit including components for selective assembly in either of a slam latch configuration or a dead bolt latch configutation, the convertible latch kit comprising:

a housing;

an electrically operated drive mechanism mounted in said housing and having an associated drive mechanism output, said electrically operated drive mechanism including an electrically operated motor, said drive mechanism output comprising a gear train, an output cam, an output cam pin, a slide, and a slide tab coupled to said slide, said slide tab configured for engagement with said cam pin, such that operation of said electrically operated drive mechanism permits movement of said cam pin;

a slam bolt with an angled cam surface, said slam bolt configured to be selectively mounted in said housing in the slam latch configuration, said slam bolt configured to engage the slide of said drive mechanism output in order to be retracted by said drive mechanism output when said slam bolt is mounted in said housing in the slam latch configuration;

a spring configured to be cooperatively engageable with said slam bolt to provide a force thereto in the direction of extending said slam bolt from said housing; and

a dead bolt configured to be selectively mounted in said housing in the dead bolt latch configuration, said dead bolt latch configured to engage the slide of the drive mechanism output in order to be selectively alternately retracted and extended by said drive mechanism output when said dead bolt is mounted in said housing in the dead bolt latch configuration.

13. A convertible latch kit as in claim 12, further comprising:

an electrical connector mounted in said housing and configured to provide electrical connection to said electrically operated drive mechanism.

14. A convertible latch kit as in claim 13, further comprising at least one electrical switch coupled to said electrical connector and mounted in said housing so as to sense movement of one of said slam bolt and said dead bolt mounted in said housing.

15. A convertible motorized latch that may be configured in either of a slam latch configuration or a dead bolt latch configuration, the convertible motorized latch for use with a cabinet of the type having an alternately openable and closeable door, the convertible motorized latch comprising:

a latch housing, configured to be supported on the a door of a cabinet, on the inside of such cabinet;

a latch bolt associated with said latch housing, said latch bolt configured for alternately assuming retracted and extended positions relative to such housing and configured to operate in either of the slam latch configuration or the dead bolt latch configuration;

when in the slam latch configuration, said latch bolt selectively comprises a slam latch bolt having an angled cam surface, and, when in the dead bolt latch configuration, said latch bolt selectively comprises a dead latch bolt;

an electric motor contained within said latch housing, and operative when actuated to unlock said latch bolt by moving it into a retracted position thereof;

a drive mechanism output including a geared output incorporated within said latch housing and associated with said electric motor so as to provide reduced speed and increased torque therefrom said drive output mechanism further including an output cam, an output cam pin, a slide engageable with the latch bolt, and a slide tab coupled to said slide, said slide tab configured for engagement with said cam pin; and

an electrical feedback switch for signaling latch bolt retraction.

16. A convertible motorized latch as in claim 15 for use with a cabinet of the type further having an associated strike plate supported on a frame thereof and interoperative with the angled cam surface of said latch bolt for permitting alternate opening and closing of such cabinet door, said convertible motorized latch further including a spring actuator for actuating said latch bolt in the slam latch configuration thereof.

17. A convertible motorized latch as in claim 15 for use with a cabinet of the type further having a recessed area formed in a frame thereof and interoperative with said latch bolt of said convertible motorized latch for permitting alternate opening and closing of such cabinet door, said convertible motorized latch further including an actuator for actuating said latch bolt by operation of said electric motor in the dead bolt latch configuration thereof.

18. A convertible motorized latch as in claim 17, further including a second electrical feedback switch for signaling extension of said latch bolt.