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Gate opening and closing apparatus and method

  • US 4,313,281 A
  • Filed: 03/03/1980
  • Issued: 02/02/1982
  • Est. Priority Date: 03/03/1980
  • Status: Expired due to Term
First Claim
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1. An apparatus for shifting a gate from a closed position to an open position and from the open position to the closed position with respect to an access opening, said apparatus comprising:

  • (a) a housing,(b) motive means associated with said housing,(c) a drive member operatively connected to said motive means and capable of being connected to a gate for causing shifting movement of same,(d) a locking mechanism operatively associated with said drive member and being in engagement with said drive member to prevent same from causing shifting movement of said gate when said motive means is not energized and to prevent shifting movement of said gate even from manual attempt to move said drive member, said locking mechanism also being opened and unengageable with said drive member when said motive means is energized to permit movement of said gate when said motive means is energized, and(e) a manually operable release member operatively connected to said locking mechanism and to said drive member, said release member being effective to prevent engagement between said locking mechanism and said drive member so that said locking member does not prevent shifting movement of said gate, said release member also being simultaneously operable to prevent said drive member from being operable by said motive means when said release member is actuated to thereby override said apparatus and permit easy manual shiftable movement of said gate.

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