Thumbturn and assembly and method of providing a thumbturn

Details Thumbturn and assembly and method of providing a thumbturn Thumbturn and assembly and method of providing a thumbturn

1975-11-07

1977-03-29

Mitchell, James C.

Closure fasteners

Knobs

E05B 100

Patent

active

040145735

ABSTRACT:
A thumbturn assembly for use with a door lock has a rose body having a face wall and adapted to be secured to a door panel. The rose body has a central hub concentric with an axis and has a bearing ring merging with the face wall and the hub and projecting from the face wall. A thumbturn has individual side walls connected by end walls and a front wall. A pair of semi-cylindrical journal walls extend from the side walls through the hub symmetrically with the axis. The journal walls merge with thrust walls merging with the side walls and facing the bearing ring. The ends of the journal walls extend through openings in the end wall of a cap having a drum wall concentric with the axis. The ends of the journal walls are bent to provide lugs urging the cap toward the hub and urging the thrust walls toward the bearing ring. The cap end wall also has an opening for a driver bar.
The thumbturn is made by forming a somewhat yieldable planar sheet into an approximately elliptical central portion having a pair of tabs extending from the opposite sides of the central portion. The central portion is then drawn into a cup, leaving the tabs in their original planar position. The tabs are then curved into semi-cylindrical shape facing in the same direction. Finally the tabs are moved into a position concentric with an axis normal to the original plane. Preferably junctures of narrower width than the tabs are disposed between the tabs and the central portion.

REFERENCES:
patent: 2454927 (1948-11-01), Kalwo
patent: 2538647 (1951-01-01), Lickteig
patent: 2811384 (1957-10-01), Schmid

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