Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Sash balances – Spring
Patent
1996-11-19
1999-01-12
Mah, Chuck
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Sash balances
Spring
A47B 9502
Patent
active
058572422
ABSTRACT:
The control knob includes an aperture with a D-shaped cross section. The aperture is formed by a relatively rigid planar portion and an arcuate portion which further includes a relatively flexible inner concentric portion and a relatively rigid flexible outer concentric portion. The relatively flexible inner concentric portion is attached to the relatively rigid planar portion by living hinges and further includes outwardly pointing stop bumps. The outwardly pointing stop bumps are spaced from said relatively rigid flexible outer concentric portion when no rotational torque is applied to the control knob with respect to the shaft and the structure allows torsional elasticity when a limited amount of rotational torque is applied to the control knob. However, when torque is applied which exceeds a threshold, the stop bumps are urged against the relatively flexible inner concentric portion and additional torsional elasticity and additional rotation is limited. The relatively rigid planar portion further includes a stop bump along a portion thereof which limits insertion of the shaft, but which collapses upon sudden impact to allow additional insertion of the shaft into the control knob.
REFERENCES:
patent: 2574330 (1951-11-01), Judd
patent: 3188124 (1965-06-01), Pestka et al.
patent: 3783708 (1974-01-01), Witkowski
patent: 3808635 (1974-05-01), Moran et al.
patent: 3880536 (1975-04-01), Petrus
patent: 3994608 (1976-11-01), Swiderski et al.
patent: 4179771 (1979-12-01), Rankins et al.
patent: 4295246 (1981-10-01), Howie, Jr.
patent: 4441230 (1984-04-01), Howie, Jr.
patent: 4923325 (1990-05-01), Howie, Jr.
Hall Michael J.
Pizzo William C.
Sippel James E.
Illinois Tool Works Inc.
Mah Chuck
LandOfFree
Control knob does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control knob, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control knob will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1504332