Flat plastic key with rigid torque transfer insert

Details Flat plastic key with rigid torque transfer insert Flat plastic key with rigid torque transfer insert

1990-01-31

1991-07-09

Gall, Lloyd A.

Locks

Operating mechanism

Key

70406, 70408, 264273, 264274, E05B 1902

Patent

active

050294598

ABSTRACT:
A flat plastic key is designed to actuate a rotary cylinder lock having lock tumblers, an elongated key receptable for receiving the key and a rotary lock face including a rectangular lock entrance slot with spaced apart sidwalls. The key and the lock include alignable longitudinal axes. The plastic key includes a head for receiving a lock actuating input torque within a force input area. The key also includes a shank having a first end surface joined to the end surface of the head and a spaced apart second end surface. The shank is designed to extend through the lock entrance slot of the lock face. When fully inserted, the resulting area of overlap between the sides of the fully inserted key shank and the lock entrance slot define a shank torque transfer surface where torque is transferred from the shank to the sidewalls of the lock entrance slot. The key also includes a solid plastic bit and a rigid metal insert. The metal insert is embedded in the head and the shank of the key and includes a length less than the combined length of the head and the shank. The insert extends beyond the shank torque transfer surface but terminates without extending into the key bit.

REFERENCES:
patent: 2714304 (1955-08-01), Dedda

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