Switch apparatus for activating switch contacts
AssigneeMannesmann Demag AG
InventorDirk Rotthaus
Life of this patent
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Abstract
Apparatus is provided for the positive activation of a switching device operated to function after a predetermined number of revolutions of a drive shaft to deactivate a drive prior to the apparatus reaching a stopping point, such as in finishing machines. Two camshafts are provided, with one driven slowly and one driven rapidly through appropriate gearing from the drive shaft of the apparatus. One or more cams are spaced on each camshaft with the slow cams having a short actuating surface and the fast cams having a long activating surface. Each slow and fast activating surface engages, respectively, one end of a toggle lever, which in turn moves a thrust rod to open the switch. Each toggle lever must be engaged simultaneously with a short and a long activating surface to activate the switch.
Claims9
Switching apparatus for deactivating a drive, comprising
- (a) a drive shaft for said drive;
- (b) a switch contact for deactivating said drive;
- (c) a first camshaft;
- (d) a second camshaft;
- (e) gear reduction means connecting said drive shaft to said first and second camshafts;
- (f) a cam positioned on each said first and second camshaft;
- the improvement characterized by
- (g) said first camshaft is driven slowly through said gear reduction means;
- (h) said second camshaft is driven rapidly through said gear reduction means;
- (i) a toggle lever having two ends;
- (j) a thrust rod being mechanically connected to said switch contact and said toggle lever, said thrust rod being located between the ends of said toggle lever;
- (k) a short activating surface on said cam on said first camshaft for engaging one end of said toggle lever;
- and
- (l) a long activating surface on said cam on said second camshaft for engaging the opposite end of said toggle lever;
- (m) whereby the simultaneous movement of both ends of said toggle lever onto said short and long activating surfaces causes said thrust rod to engage said switch contact.
Dependencies are inferred from the claim text.