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Vehicle brake and engine interlock

  • US 4,295,540 A
  • Filed: 09/14/1979
  • Issued: 10/20/1981
  • Est. Priority Date: 09/14/1979
  • Status: Expired due to Term
First Claim
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1. In a brake protection interlock system (23, 23a) for a vehicle (11, 11a) having ground engaging means (13, 13a), a brake (19, 19a), an engine (12, 12a), and drive delivery means (14, 14a) for transmitting power from said engine (12, 12a) to said ground engaging means (13, 13a), said drive delivery means (14, 14a) having a transmission (16, 16a) with at least one nondrive transmitting condition and at least one drive transmitting condition and having a clutch (18, 18a) which may be engaged and disengaged, and including first means (29, 29a) for preventing initiation of powered travel of said vehicle (11, 11a) with said brake (19, 19a) engaged by suppressing power output from said engine (12, 12a), the improvement comprising:

  • second means (28, 28a) for causing said first means (29, 29a) to suppress power output from said engine (12, 12a) in response to said transmission (16, 16a) being in said drive transmitting condition while both of said brake (19, 19a) and said clutch (18, 18a) are engaged, andthird means (27, 27a) for enabling starting of said engine (12, 12a) with said transmission (16, 16a) in drive transmitting condition while said brake (19, 19a) is engaged by inactivating said second means (28, 28a) in response to said clutch (18, 18a) being in disengaged condition.

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