Peter A Gwyther

US Patent:

6461232, Oct 8, 2002

Filed:

Jan 29, 2001

Appl. No.:

09/772020

Inventors:

Peter Gwyther - Madison CT

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22C 1700

US Classification:

452166, 452 64

Abstract:

A toe web cutter has a pivoted inner hooked blade and stationary outer blades adjacent to the sides and end of the inner blade. Cutting edges on the adjacent blades produce an elongated cut to remove the web from between the toes of a carcass. The stationary outer blades allow the tool to be aligned before the cut is made by placing the stationary blades in contact with the web at the desired location for the cut. The inner blade is pivoted by a trigger-operated pneumatic drive mechanism, which includes a piston and a drive rod. The drive rod is connected through a link to drive the inner blade. The link produces a side load on the drive rod that is counteracted by a wheel mounted on the end of the drive rod and by a fixed reaction plate that supports the wheel as it rolls.

US Patent:

6511483, Jan 28, 2003

Filed:

Jul 25, 2001

Appl. No.:

09/915099

Inventors:

Peter Gwyther - Madison CT

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A61B 1700

US Classification:

606 79

Abstract:

A spinal cord removal tool for removing a spinal cord and spinal cord membrane from a carcass includes a spinning blade disk having multiple removal blades mounted around its perimeter, each removal blade having a forward facing cutting edge that can enter the spinal cord channel and side cutting edges that cooperate with floating self-adjusting side blades to chop the spinal cord membrane as it is brought into the tool.

US Patent:

6648746, Nov 18, 2003

Filed:

Aug 16, 2002

Appl. No.:

10/222118

Inventors:

Peter Gwyther - Madison CT

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22C 1700

US Classification:

452166, 452 64, 30249

Abstract:

A toe web cutter has a pivoted inner hooked blade and stationary outer blades adjacent to the sides and end of the inner blade. Cutting edges on the adjacent blades produce an elongated cut to remove the web from between the toes of a carcass. The stationary outer blades allow the tool to be aligned before the cut is made by placing the stationary blades in contact with the web at the desired location for the cut. The inner blade is pivoted by a trigger-operated pneumatic drive mechanism, which includes a piston and a drive rod. The drive rod is connected through a link to drive the inner blade. The link produces a side load on the drive rod that is counteracted by a wheel mounted on the end of the drive rod and by a fixed reaction plate that supports the wheel as it rolls.

US Patent:

6805696, Oct 19, 2004

Filed:

Oct 23, 2001

Appl. No.:

10/045220

Inventors:

Peter Gwyther - Madison CT

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A61B 1714

US Classification:

606 79

Abstract:

A spinal cord removal tool for removing a spinal cord and spinal cord membrane from a carcass includes a spinning blade disk having multiple removal blades mounted around its perimeter, each removal blade having a forward facing cutting edge that can enter the spinal cord channel and side cutting edges that cooperate with side blades to chop the spinal cord membrane as it is brought into the tool. The side blades are adjustably mounted to move towards and away from the removal blades and compensate for changes in the width of the removal blades due to wear or sharpening. The side blade adjustment mechanism may include a self-adjusting floating mount for the side blades or a manually adjustable mount that can be set to any desired blade clearance for higher-speed and lower noise operation.

US Patent:

7163453, Jan 16, 2007

Filed:

Sep 29, 2005

Appl. No.:

11/238320

Inventors:

Peter Gwyther - Madison CT, US

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22B 5/16

US Classification:

452132

Abstract:

A counterbalanced handheld dehider includes a pair of cutting disks driven in opposed cutting oscillations by a motor through an eccentric shaft turned by the motor. Two pushrods, one for each cutting disk, are connected between the eccentric shaft and respective cutting disks. The dehider is dynamically counterbalanced by a first counterbalance mass located on one side of the pushrods and a second counterbalance mass located on the opposite side of the pushrods from the first counterbalance mass. The counterbalance masses are located close to the plane of the pushrods. The invention also includes the counterbalanced eccentric shaft with an integrated first counterbalance mass, and a counterbalance cup with an integrated counterbalance mass.

US Patent:

7722448, May 25, 2010

Filed:

Aug 16, 2006

Appl. No.:

11/464991

Inventors:

Peter Gwyther - Madison CT, US

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22B 5/16

US Classification:

452133

Abstract:

A dehider includes a pneumatic motor driving a pair of disk blades in opposed cutting oscillations and a governor that controls the speed of the motor. Governor balls, acting as centrifugal weights, spin with the motor and push against an inclined flange on a valve head to move the valve head towards a valve seat. The motion of the valve head compresses a biasing spring and restricts the flow of pressurized air as the desired speed is exceeded. As speed decreases, centrifugal force decreases and the biasing spring opens the valve to provide additional power to the motor. The disk blades are provided with a cylindrical central lip that substantially increases the area of the central bearing that the blades turn on and produces significantly longer blade life.

US Patent:

7963829, Jun 21, 2011

Filed:

Feb 3, 2010

Appl. No.:

12/699358

Inventors:

Peter Gwyther - Madison CT, US

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22B 5/16

US Classification:

452133

Abstract:

A dehider includes a pneumatic motor driving a pair of disk blades in opposed cutting oscillations and a governor that controls the speed of the motor. Governor balls, acting as centrifugal weights, spin with the motor and push against an inclined flange on a valve head to move the valve head towards a valve seat. The motion of the valve head compresses a biasing spring and restricts the flow of pressurized air as the desired speed is exceeded. As speed decreases, centrifugal force decreases and the biasing spring opens the valve to provide additional power to the motor. The disk blades are provided with a cylindrical central lip that substantially increases the area of the central bearing that the blades turn on and produces significantly longer blade life.

US Patent:

8047901, Nov 1, 2011

Filed:

Jun 20, 2011

Appl. No.:

13/164238

Inventors:

Peter Gwyther - Madison CT, US

Assignee:

Jarvis Products Corporation - Middletown CT

International Classification:

A22C 25/17

US Classification:

452133

Abstract:

A dehider includes a pneumatic motor driving a pair of disk blades in opposed cutting oscillations and a governor that controls the speed of the motor. Governor balls, acting as centrifugal weights, spin with the motor and push against an inclined flange on a valve head to move the valve head towards a valve seat. The motion of the valve head compresses a biasing spring and restricts the flow of pressurized air as the desired speed is exceeded. As speed decreases, centrifugal force decreases and the biasing spring opens the valve to provide additional power to the motor. The disk blades are provided with a cylindrical central lip that substantially increases the area of the central bearing that the blades turn on and produces significantly longer blade life.