×

Safety grounding circuits

  • US 3,969,875 A
  • Filed: 04/18/1975
  • Issued: 07/20/1976
  • Est. Priority Date: 04/18/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In an electrical system for controlling a function of a grass mower driven by an internal combustion engine having a magneto which if grounded stops the operation of the engine, said mower having a grass cutting unit powered by said engine, a clutch for engaging and disengaging the cutting unit with the engine, and a catcher carried by the mower for catching cut grass discharged therefrom when the catcher is in proper grass catching position on the mower, the combination of an electrical switch normally closed when the said clutch is engaged and disposed to be automatically opened upon the disengagement of said clutch, a second electrical switch normally closed when the said catcher is not in its proper grass catching position on the mower and disposed to be automatically opened upon the movement of said catcher to a location where it is at its said proper grass catching position, and electrical circuit means electrically connecting said magneto, said switches and ground to connect the magneto with ground to stop the engine upon the closing of said second switch when the catcher is not in said proper grass catching position unless the said first switch is then open upon the disengagement of said clutch to disconnect the magneto with ground.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×