PETER ERIC FROHLICH
Pilots in Landrum, SC
License number
South Carolina A0633679
Issued Date
Dec 2015
Expiration Date
Dec 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
PO Box 187, Landrum, SC 29356
Professional information
Adjustable Door Spring Hinge With Fixed Minimum Tension
US Patent:
3965533, Jun 29, 1976
Filed:
May 23, 1975
Appl. No.:
5/580187
Inventors:
Peter E. Frohlich - Landrum SC
Assignee:
Bommer Spring Hinge Co. Inc. - Landrum SC
International Classification:
E05F 112
US Classification:
16189
Abstract:
Aligned hollow knuckles on a pair of hinge leaves form a cylindrical barrel. Spaced plugs inserted into each end of the barrel serve to keep the knuckles from separating and act as a pivot pin for the hinge. Bifurcated reduced inner portions of the plugs receive the ends of a coil spring therebetween. One plug is permanently secured to a knuckle of one hinge leaf. A pin secured to the other knuckle extends into the barrel and is carried within an annular groove in the adjacent plug. A stop in the groove limits the travel of the pin. Minimum tension is provided at all times in the hinge by the initial setting of the stops with respect to the pin. Additional tension is provided by a plug rotating means together with a second pin engageable with recesses in the plug and a bore in the hinge knuckle.