The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 1992
Filed:
Aug. 27, 1990
David Saint, West Nantmeal, PA (US);
Graco Children's Products, Inc., Elverson, PA (US);
Abstract
A spring motor includes a power spring having a plurality of ends, a multiplicity of coils between the ends and a plurality of lobes defined by the coils. Each lobe includes at least some coils which increase and then decrease in radii to define the lobe. The spring is wound through a spool coupled to one end of the spring and engaged with a crankshaft extending through the spring. A lock clutch on the spool prevents the spring from unwinding through the spool. The escapement permits controlled unwinding of the spring to oscillate the carriage. The remaining end of the spring is coupled to a ratchet wheel which is an escape wheel of an escapement. The spring is supported on a mandrel in the form of a tube coupled to the escape wheel. A plurality of coils at one end of the spring forms a slip clutch which engage the tube to prevent overwinding of the spring. A washer mounted on the tube within the spring prevents remaining coils of the spring from engaging coils of the slip clutch.