Michael A Hunt

US Patent:

6520067, Feb 18, 2003

Filed:

Dec 12, 2001

Appl. No.:

09/683309

Inventors:

Michael H. Hunt - Tampa FL 33605
Preston E. Smith - Tampa FL 33605

International Classification:

F15B 1526

US Classification:

92 23, 70423, 180287

Abstract:

A device for locking a piston rod of a hydraulic piston and cylinder assembly in an extended condition. The locking device is placed in interposed relation to a hydraulic cylinder and an opposing bearing point to prevent retraction of the piston rod. The device has a split sleeve configuration to facilitate mounting the locking device in encircling relating to the piston rod including opposed longitudinally extending edges that are locked to one another via a locking means. The locking means of the device is partially enclosed by a lock protecting housing to protect the locking device from being removed by unauthorized persons. The device is durable, easy to install and remove, and adaptable to a variety of hydraulic piston and cylinder assemblies.

US Patent:

6874338, Apr 5, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/605451

Inventors:

Michael H Hunt - Tampa FL, US
Preston E Smith - Tampa FL, US

International Classification:

E05B073/00

US Classification:

70 14, 70 18, 70 19, 70181

Abstract:

A device for locking a piston rod of a hydraulic piston and cylinder assembly in an extended condition so that mobile construction equipment or other heavy machinery cannot be driven from a job site. The locking device is placed in ensleeving relation to an extended piston rod between a proximal hydraulic cylinder and a distal bearing point to prevent retraction of the piston rod. The device has a hollow sleeve configuration formed of confronting first and second sleeve parts that are hingedly connected to one another. A first lock secures the first and second sleeve members to one another along a longitudinally extending parting line. A second lock is opposed to the first lock and prevents hinged movement of the first and second sleeve parts relative to one another even if the first lock is defeated. The device is adaptable to a variety of hydraulic piston and cylinder assemblies.