Master Lock Company LLC

Victor Yip

John B Zapushek

Jim Recknagel

Ken Burmesch

Mark J Van Handel

Gary R Burmesch

Chris Irgens

Rolf Hohmann

Kerry Jacques

Kenneth N Grandy, Sr

Timothy Makos

Joseph Elliott

Kenneth Burmesch

An adjustable coupler lock for locking a trailer hitch such that a trailer cannot be removed from a vehicle. The coupler lock comprises a lock body with a locking mechanism and a locking plate, and also comprises a shaft having a narrow and a flange end, and also having multiple recesses along the length of the shaft for engagement with the locking plate of the lock body. The recesses along the length of the shaft have a vertical edge which engages the locking plate such that the lock body cannot be removed from the shaft without unlocking the locking mechanism. The recesses also have a tapered edge that allows for slidable movement of the lock body along the shaft, without unlocking the locking mechanism, for the purpose of adjusting the lock to the size of the latch.

Coupler latch lock and method of use

An adjustable coupler lock for locking a trailer hitch such that a trailer cannot be removed from a vehicle. The coupler lock comprises a lock body with a locking mechanism and a locking plate, and also comprises a shaft having a narrow and a flange end, and also having multiple recesses along the length of the shaft for engagement with the locking plate of the lock body. The recesses along the length of the shaft have a vertical edge which engages the locking plate such that the lock body cannot be removed from the shaft without unlocking the locking mechanism. The recesses also have a tapered edge that allows for slidable movement of the lock body along the shaft, without unlocking the locking mechanism, for the purpose of adjusting the lock to the size of the latch. The components of the coupler lock are made of stainless steel.

Adjustable width coupler latch lock

Receiver pin

The invention provides a pair of cuff locks joined by a universal joint and linkage system which provides for 360 relative rotation between the cuffs as well as allow the cuffs to be folded together into a compact position. The invention further provides for a push button cylinder lock which includes a rotatable plug and a fixed plug each having a plurality of aligned bores for receiving one or more tumbler pins. The push button cylinder lock further includes a non-rotatable push button shaft which is sildably mounted within the housing. One or more retaining pins engage locking indents of the push button shaft.

Cuff lock and push-button locking mechanism

Growing community of inventors

Hong Kong, China

Victor Yip