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Pneumatic door locking system

  • US 4,021,066 A
  • Filed: 07/11/1975
  • Issued: 05/03/1977
  • Est. Priority Date: 07/11/1975
  • Status: Expired due to Term
First Claim
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1. A pneumatic door locking system which is intended for locking a door of a vehicular carrier intended to transport goods and which is connected to a source of pressurized air utilized by the carrier, said system comprising:

  • means for latching a door to a door frame of a carrier;

    said latching means including a bolt and means for biasing the bolt toward a latched position in which the door is prevented from opening;

    said latching means including a box-shaped holder for said bolt, said holder being open at one end and closed at the opposite end with one side of said holder being fixed to the carrier and the opposite side having a slot therein, said bolt and said biasing means being received in said holder with said biasing means disposed between said closed end of said holder and one end of said bolt and said bolt having a slot therein aligned with said slot in said holder;

    pneumatically-operated means for urging said bolt to an unlatched position;

    said bolt urging means including a cylinder mounted to the opposite side of said holder, a piston in said cylinder, a piston rod fixed at one end to said piston with the other end of said piston rod extending from said cylinder and being connected to a bar which extends into said slots, and a spring in said cylinder behind said piston, said connecting means being connected to said cylinder whereby air pressure is applied to the front of said piston to move said piston against said spring thereby to move said bar in said slot in the said bolt to engage and move said bolt against the biasing means to an unlatched position and whereby when air pressure is vented from said cylinder, said bolt is moved by said biasing means and said spring to a latched position;

    means connecting said bolt urging means to a source of pressurized air; and

    manually-operated valve means disposed on the exterior of the carrier and coupled to said connecting means for venting said bolt urging means to atmosphere.

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