Timer with two speed delay drive system
AssigneeFrance/Scott Fetzer Company
InventorDaniel K. Amonett
Life of this patent
Estimating the term…
Abstract
A cam-operated timer 10 for a household appliance includes an interval type delay drive system to provide variable delay speeds to the rotation of a program cam. The timer 10 includes a rotatable cam-carrying member 16 having a control profile 60 of teeth and plateaus. A rotatable delay wheel 18 also includes a series of delay teeth 73 with at least one tooth 76 being of substantially greater depth than the remaining standard delay teeth 74. A delay pawl 22 is operatively connected to the drive mechanism of the timer 10 and includes at least first and second prongs 80, 82 spaced approximately the distance between the cam-carrying member 16 and the delay wheel 18, with the first prong 80 being substantially shorter than the second prong 82.
Claims30
A timer for controlling an appliance, comprising:
- a rotatable cam-carrying member having cam surfaces thereon, and further including a control profile having a plurality of teeth and a plurality of plateaus disposed thereon;
- a rotatable delay wheel having a plurality of delay teeth disposed about the periphery of said delay wheel, each of said delay teeth being spaced a substantially equal distance one from another, and said delay teeth having a depth which is a substantially uniform depth relative to one another, at least two of said delay teeth being of greater depth than the substantially uniform depth of the remaining delay teeth;
- a shaft to which said cam-carrying member is fixedly mounted and about which said delay wheel is freely rotatable, said cam-carrying member and said delay wheel being located adjacent one another;
- a drive mechanism for directly causing rotation of said cam-carrying member;
- and
- a delay pawl operatively connected to said drive mechanism, said delay pawl including first and second prongs, wherein said first prong is adapted to contact said cam-carrying member and said second prong is adapted to contact said delay wheel.
A timer for controlling an appliance, comprising:
- a rotatable cam-carrying member having cam surfaces thereon, and further including a control profile having a plurality of teeth and a plurality of plateaus disposed thereon;
- a rotatable delay wheel having a plurality of delay teeth disposed about the periphery of said delay wheel, each of said delay teeth being spaced a substantially equal distance one from another, and said delay teeth having a depth which is a substantially uniform depth relative to one another, at least two of said delay teeth being of greater depth than the substantially uniform depth of the remaining delay teeth;
- a shaft to which said cam-carrying member is fixedly mounted and about which said delay wheel is freely rotatable, said cam-carrying member and said delay wheel being located adjacent one another;
- a first drive mechanism for causing rotation of said cam carrying member when said timer is in a normal advance mode;
- and
- a second drive mechanism for causing rotation of said cam carrying member when said timer is in a delay mode.
A timer for controlling an appliance, comprising:
- a rotatable cam-carrying member having cam surfaces thereon, and further including a control profile having a plurality of teeth and a plurality of plateaus disposed thereon, said plurality of teeth further including a plurality of upper teeth disposed on said control profile the same radial distance from the axis of symmetry of the rotatable cam-carrying member as the plurality of plateaus;
- a rotatable delay wheel having a plurality of delay teeth disposed about the periphery of said delay wheel, each of said delay teeth being spaced a substantially equal distance one from another, and said delay teeth having a depth which is a substantially uniform depth relative to one another, at least two of said delay teeth being of greater depth than the substantially uniform depth of the remaining delay teeth;
- a shaft to which said cam-carrying member is fixedly mounted and about which said delay wheel is freely rotatable, said cam-carrying member and said delay wheel being located adjacent one another;
- and
- a drive mechanism including a delay pawl, said delay pawl including first and second prongs, wherein said first prong is adapted to contact said cam-carrying member and said second prong is adapted to contact said delay wheel.
Dependencies are inferred from the claim text.