Title: Return spring for teeth clutch -- two stage force

Abstract: An electromagnetic clutch has a toothed driving clutch member and a toothed driven clutch member which are moved together upon energization of an electromagnet with their teeth in engagement. A spring disengages the teeth when the electromagnet is deenergized. The spring provides a relatively large spring force for initial breakaway to overcome residual magnetism and metal to metal contact of the teeth. After initial breakaway the spring provides only sufficient force to further separate the members. With this arrangement a small magnet may be used to engage the clutch because the large force of the spring must be overcome only during final engagement of the clutch.

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Inventors: Puro, John Frederick (Elmira, NY, US)

Application Number: 589815
Filing Date: 1975-06-24
Publication_date: 1977-03-08
Assignee: Facet Enterprises, Inc. (Tulsa, OK)
Primary Class(es): 192/84.92 192/84.96
Other Classes:
US Patent Ref:

3337013	Aug, 1967	Wrensch	192/84.
3446322	May, 1969	Wrensch	192/84.

Other Refs: 961,772

Jun, 1964	UK

Primary Examiner: Herrmans, Allan D.
Assistant Examiner:
Attorney: VanOphem; Remy J.