Ping C Tsai

US Patent:

8141400, Mar 27, 2012

Filed:

Mar 23, 2010

Appl. No.:

12/730148

Inventors:

Birk Cliff Sorensen - Whittier CA, US
Ping Hsien Tsai - Walnut CA, US
Wai Pang Wong - Orange CT, US
John Edward Walsh - Wallingford CT, US
Louis Romo Martinez - Montebello CA, US

Assignee:

Emtek Products, Inc. - City of Industry CA

International Classification:

E05B 47/00

US Classification:

702791, 70277, 702781, 702787, 70280, 70281, 70282, 70283, 70468, 70472, 70190, 340 554, 340 564, 340 57

Abstract:

A keypad lockset adapted for deadbolt as well as lever locks, and having as a first embodiment an exterior gear train, an interior gear train, and an electronically controlled clutch for coupling the gear trains when engaged and for uncoupling the gear trains when the clutch is disengaged, so that when the clutch is engaged rotation of an external thumb turn will permit the door latch to be withdrawn and thus to permit opening of the door, and a mechanical override mechanism that can be operated in case of electrical failure, and in which clutch mechanism and the override mechanism both operate through the single, standard 2 and ⅛ inch door preparation hole, or alternatively as a second embodiment, a keypad lockset in which two four-bar mechanical linkages are used in place of gears as means to actuate the clutch, and alternatively to provide for a pass-through override function.

US Patent:

8176761, May 15, 2012

Filed:

Nov 11, 2011

Appl. No.:

13/294616

Inventors:

Birk Cliff Sorensen - Whittier CA, US
Ping Hsien Tsai - Walnut CA, US
Wai Pang Wong - Orange CT, US
John Edward Walsh - Wallingford CT, US
Louls Romo Martinez - Montebello CA, US

Assignee:

Emtek Products, Inc. - City of Industry CA

International Classification:

E05B 47/00

US Classification:

702791, 70277, 702781, 702787, 292137, 292169, 292139, 292143

Abstract:

A keypad lockset adapted for deadbolt as well as lever locks, and having as a first embodiment an exterior gear train, an interior gear train, and an electronically controlled clutch for coupling the gear trains when engaged and for uncoupling the gear trains when the clutch is disengaged, so that when the clutch is engaged rotation of an external thumb turn will permit the door latch to be withdrawn and thus to permit opening of the door, and a mechanical override mechanism that can be operated in case of electrical failure, and in which clutch mechanism and the override mechanism both operate through the single, standard 2⅛ inch door preparation hole, or alternatively as a second embodiment, a keypad lockset in which two four-bar mechanical linkages are used in place of gears as means to actuate the clutch, and alternatively to provide for a pass-through override function.

US Patent:

20150015003, Jan 15, 2015

Filed:

Jul 11, 2013

Appl. No.:

13/940178

Inventors:

PING HSIEN TSAI - Walnut CA, US
Birk Cliff Sorensen - Whittier CA, US

International Classification:

E05C 3/14

US Classification:

2923363

Abstract:

Locksets primarily intended for use in interior residential doors and that have a concealed fastener mechanism positioned on one side of the lockset, the mechanism including connecting a first handle connected to a second handle through a spindle with the concealed fastener mechanism comprising a generally cylindrical housing including a torsion spring, a timing plate and a cover plate, the housing including an internally threaded central aperture, the timing plate including at least one tab adapted to cooperate with said torsion spring to return the handle to its at-rest position after rotation.

US Patent:

20140159392, Jun 12, 2014

Filed:

Feb 18, 2014

Appl. No.:

14/183326

Inventors:

Ping Hsien Tsai - Walnut CA, US
Birk Cliff Sorensen - Whittier CA, US

Assignee:

EMTEK PRODUCTS, INC. - City of Industry CA

International Classification:

E05B 9/00

US Classification:

2923363

Abstract:

Locksets primarily intended for use in interior residential doors and that have a concealed fastener mechanism positioned on one side of the lockset, the mechanism including connecting a first handle connected to a second handle through a spindle with the concealed fastener mechanism comprising a generally cylindrical housing including a torsion spring, a timing plate and a cover plate, the housing including an internally threaded central aperture, the timing plate including at least one tab adapted to cooperate with said torsion spring to return the handle to its at-rest position after rotation, a spindle expansion and stabilizing screw adapted to eliminate any gap between the spindle and the timing plate and a spindle set screw that, when engaged eliminates any gap between the spindle and its handle to thereby eliminate the “wobble” that otherwise could be in the lockset.