Truck-trailer antitheft locking system
First Claim
Patent Images
1. An antitheft locking system for a semi-trailer comprising:
- a plunger for positioning with respect to the hitch pin on a semi-trailer, said plunger being movable from a retracted position to an extended position so that in the extended position it inhibits access to the hitch pin on the semi-trailer and in its retracted position, permits access to the hitch pin; and
means for controllably extending said plunger.
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Abstract
When the air brake line on a semi-trailer is disconnected, a plunger is thrust down through the semi-trailer bottom plate to obstruct access to the semi-trailer hitch pin. Reconnection of the air brake line withdraws the plunger.
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Citations
19 Claims
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1. An antitheft locking system for a semi-trailer comprising:
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a plunger for positioning with respect to the hitch pin on a semi-trailer, said plunger being movable from a retracted position to an extended position so that in the extended position it inhibits access to the hitch pin on the semi-trailer and in its retracted position, permits access to the hitch pin; and means for controllably extending said plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An antitheft locking system for a semi-trailer having a hitch pin, comprising:
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an access control mechanism for mounting on the semi-trailer, a plunger movably mounted in said access control mechanism for movement from an extended position where it inhibits access to the hitch pin to a retracted position which permits access to the hitch pin, said access control mechanism including a body for securing on the semi-trailer, said plunger being movably mounted with respect to said body, a pin on said plunger, a control box having a cam slot therein, said pin extending into said cam slot; and means for moving said control box to control extension of said plunger. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An antitheft locking system comprising:
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an access control mechanism, said access control mechanism having a body therein, a bore in said body, a plunger movably mounted in said bore for movement from a retracted position to an extended position, means for mounting said access control mechanism on a semitrailer adjacent the hitch pin of the semi-trailer so that when said plunger is extended it inhibits access to the hitch pin of the semi-trailer; and means for moving said plunger.
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16. An antitheft locking system comprising:
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an access control mechanism, said access control mechanism having a body therein, a bore in said body, a plunger movably mounted in said bore for movement from a retracted position to an extended position, said access control mechanism being for mounting in a semi-trailer so that when said plunger is extended it inhibits access to the hitch pin of the semi-trailer; and means for moving said plunger including a slot in said body aligned with the direction of movement of said plunger and a pin mounted in said plunger and extending through said slot, said means further including a control box embracing said body, said control box having a cam slot therein, said pin being engaged in said cam slot, said control box being movable in a direction transverse to the movement of said plunger for moving said plunger. - View Dependent Claims (17, 18, 19)
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Specification