Overload protection for metal forming machine
AssigneeWaterbury Farrel Div. of Textron, Inc.
InventorsDonald A. Roy, Albert M. Garms
Life of this patent
Estimating the term…
Abstract
A metal forming machine for forming articles from metal workpieces has a plurality of driven members for performing work on the metal workpieces. A drive shaft is connected with the driven members for transferring force to the driven members. A frangible portion is connected in the drive shaft and is designed to fail upon the occurrence of a predetermined overload at the member being driven from the drive shaft. A signalling device is associated with the frangible portion to stop the machine and give an alarm when an overload occurs which breaks the frangible portion.
Claims7
In an article forming machine having a drive train comprising driven means for forming articles, and a drive means connected with the driven means to drive the driven means, the improvement comprising:
- a frangible member in the drive train adapted to break upon the occurrence of a predetermined overload in the driven means;
- and
- signalling means operatively associated with the frangible member and operative upon breaking of the frangible member to stop the machine;
- the frangible member comprising a shear pin;
- the signalling means comprising a dead-end fluid pressure passage in the shear pin, means supplying fluid pressure to said passage, a fluid pressure responsive switch connected with the fluid pressure passage and adapted to be actuated by a change in pressure when the passage is ruptured upon breakage of the shear pin;
- the fluid responsive switch being operatively connected with the drive means of the machine to stop the machine when the shear pin is broken.
Dependencies are inferred from the claim text.