Drive and clutch for a timing mechanism
AssigneeEmhart Industries, Inc.
InventorThomas F. Ring
Life of this patent
Estimating the term…
Abstract
A pair of ratchets are coupled to a camstack with each rachet being driven by a separate drive pawl. A no back clutch, that is associated with the camstack to prevent its reversal during its advancement, comprises an annular member having a multiplicity of individual pawls engaging a multi-tooth ratchet coupled to the camstack. A spring biased lever and a spring biased actuator coupled to the lever engages one of the drive pawls so that the drive pawl can be disengaged from its ratchet for at least a portion of a program cycle.
Claims8
In a timing mechanism wherein a cam means is rotatably driven by power drive means through an intermittent drive means, an improvement characterized by said intermittent drive means comprising:
- (a) first and second ratchet means coupled to said cam means,
- (b) first and second drive pawls coupled to said power drive means engaging said first and second ratchet means respectively,
- (c) a no-back clutch operably associated with said cam means preventing reversal thereof during its advancement, and
- (d) disengaging means to disengage one of said drive pawls from said cam means and to hold said one drive pawl in disengagement for at least a portion of a program of said timing mechanism.
Dependencies are inferred from the claim text.