ROBERT LEE HALL
Architects at Walnut Grv Rd, Memphis, TN
License number
Mississippi 0372
Issued Date
Jan 30, 1956
Expiration Date
Nov 30, 1987
Category
Architecture
Address
Address
3100 Walnut Grove Rd SUITE 511, Memphis, TN 38111
Professional information
Photographer At Rc Photography
Position:
Photographer at RC Photography
Location:
Greater Memphis Area
Industry:
Photography
Work:
RC Photography
-
Photographer
Robert Trent Hall, Memphis TN - Lawyer
Address:
201 01 STE 2, Memphis 38103
Licenses:
Tennessee - Active 1982
Education:
University of Memphis - Cecil C. Humphreys School of Law
Keyless Chuck
US Patent:
4260169, Apr 7, 1981
Filed:
Nov 29, 1979
Appl. No.:
6/098661
Inventors:
Robert L. Hall - Germantown TN
International Classification:
B25B 1344, B23B 3106
US Classification:
279 62
Abstract:
A keyless chuck for attaching a drill bit to the rotary shaft of a drill. A sun gear is fixed to the rotary shaft and coacts with a set of planetary gears to rotate a body member having a plurality of threaded jaw members movably attached thereto. A screw ring member coacts with the jaw members to selectively cause the jaw member to open and close when the jaw members rotate relative to the screw ring member. A ring gear member is attached to the screw ring member and coacts with the planetary gears to allow the screw ring member to normally rotate with the jaw members unless substantial resistance is applied to the ring gear member to hinder its rotation.