Leo J Kerivan, 60271 South St, Medfield, MA 02052

4614508, Sep 30, 1986

Mar 1, 1985

6/707254

Leo Kerivan - Somerset MA

Precision Handling Devices Inc. - Fall River MA

F16H 702
G03B 130

474153

A drive mechanism having a sprocket and a belt with inter-engaging lugs and receptacles on the belt and sprocket, respectively, wherein orthographic motion is obtained of the lugs into and out of the receptacles so as to provide for smooth, high efficiency transmission of drive forces by providing a fulcrum at inter-pitch spacing positions about which the belt bends along a radius centered at the fulcrum to bring the lugs directly into registry with the receptacles in the sprocket. The system provides virtual sprocket teeth, thereby effectively doubling or multiplying the number of teeth on the sprocket, compared to lugs on the belt so that a small, low-inertia, sprocket-belt drive system effectively provides the smoothness of transmission of a system with twice or greater the number of sprocket teeth than lugs, but without the cost of such additional teeth and lugs and without sacrificing belt life due to additional flexures of the belt. The drives system is embodied in a web feed tractor wherein the belt has pins which enter into and engage perforations in a web for feeding the web. The fulcrums also locate the belt so as to accommodate the difference between the pitch of the belt lugs and the pitch of the sprocket teeth.

4706861, Nov 17, 1987

Sep 30, 1986

6/913830

Leo J. Kerivan - Somerset MA

Precision Handling Devices, Inc. - Fall River MA

G03B 130

226 74

Web feeding apparatus which may be in the form of a tractor which feeds perforated webs, such as perforated paper in a computer printer, typewriter or the like has a frame which locates a belt having pins projecting from the belt which enter the perforations in the paper and drive the paper when the belt is driven, as by a sprocket which is journalled in the frame. In the closed position, the lid overlies the belt and presents a surface adjacent the belt which is separated by a gap through which the paper passes when it is engaged with the pins. The paper also overlies the surface of the inside side plate. The gap spacing (the distance which separates the surface of the belt on which the paper is disposed) is set automatically by a gap setting member which projects from the lid and is biased with the lid into engagement with the paper when the lid is in closed position and the belt is in driving relationship with the paper. The gap setting member may be a rib or runner projecting downwardly from the lid and extending along the surface of the inside side plate.

4611737, Sep 16, 1986

Apr 8, 1985

6/721100

John D. Hubbard - Somerset MA
Leo J. Kerivan - Somerset MA

Precision Handling Devices Inc. - Fall River MA

G03B 130

226 74

A tractor for feeding perforated webs, such as perforated paper in a computer printer, typewriter or the like has a frame which locates a sprocket and a belt having pins projecting from the belt and lugs driven by the sprocket. To provide precision feeding of the web the lid is arranged with respect to the frame so that the web is maintained substantially at the pitch line of the belt where the pins enter, are engaged by and leave the perforations. The distance between the surface of the lid which faces the belt and the belt surface is limited such that the perforations contact the pin surface below a critical position where the web clings to the pins. This is the position where the angle between the surface of the belt and a line from the position of repose perpendicular to a tangent to pin surface which intersects the belt surface is equal to the art tangent of the coefficient of friction between the web and pin materials. The lid surface is preferably provided by a rib extending the length of the lid to overlie and extend beyond the region of entry and engagement of the pins and web perforations. This rib provides a thrust surface against which the pins bear to accommodate the side thrust toward the center of the web when the web is driven by two tractors engaging rows of perforations along the opposite edges of the web.

4616773, Oct 14, 1986

Apr 27, 1984

6/604761

Leo J. Kerivan - Somerset MA

Precision Handling Devices Inc. - Fall River MA

B65H 1738
B65H 3510

225 99

An overhead unit used with a printer having a platen for feeding continuous, fan-folded, edge perforated forms. Tractors engage the feed perforations on the forms. The unit automatically bursts the side perforations by the use of flexural members which extract energy from the forms feed and oscillate to burst the side perforations. Bursting of the cross perforations is carried out by a pivotally mounted, lever actuated bar which engages the platen and forms a toggle therewith to engage the successive forms against the platen just below the cross perforations; the toggle being arranged to tighten and increase the clamping force, as the form is pulled away from the platen when bursting the cross perforations. A roller assembly including rollers engaging the outside of the loop on the infeed or upstream side of the platen removes any platen wave due to differential displacement of the forms as they travel with linear motion through the tractors and with rotational motion around the platen. These rollers also steer the form to counteract lateral meandering thereof on the platen.

4275785, Jun 30, 1981

Sep 20, 1979

6/077185

Leo J. Kerivan - Wellesley MA

Industrial Blast Coil Corporation - South Easton MA

F28F 114

165183

An improved heat exchange tubing and blade assembly is described. The heat exchange assembly comprises an elongated tube and an elongated heat exchange blade strip positioned thereon. The heat exchange strip includes an array of integrally formed blade segments which extend from a U-shaped support segment of the strip. Surfaces of the blades extend at a favorable angle of attack to the incident fluid flow stream, and in a preferred embodiment the chords of the blades extend in a direction substantially normal to a longitudinal axis of the tube. The strip is supported on an outer surface of the tube, and a means integrally formed with the tube maintain the support segment in thermal contact with the tube. In a presently preferred embodiment, the tube has a generally streamlined oval cross section for utilization in heat exchanger apparatus such as in an air conditioner, refrigerator or heat pump, with the tubing arranged such that the minor axis of the oval extends perpendicular to the external fluid flow and its major axis extends parallel therewith for reducing the frictional drag and reducing stagnant regions of the external fluid flow. The multiple blades fan out from opposite sides of the oval tubing along its two gently curving arcuate faces where the fluid flow is relatively unimpeded.

4222160, Sep 16, 1980

Apr 27, 1978

5/900520

Leo J. Kerivan - Wellesley MA

Industrial Blast Coil Corporation - South Easton MA

B23P 1526

291573A

An improved heat exchange tubing and blade assembly and a method for fabricating the same are described. The heat exchange assembly comprises an elongated tube and an elongated heat exchange blade strip positioned thereon, said strip including an array of integrally formed blade segments which extend from a U-shaped support segment. Surfaces of the blades extend at a favorable angle of attack to the incident fluid flow stream, and in a preferred embodiment the chords of the blades extend substantially normal to the length of the tube. The strip is supported on an outer surface of the tube, and means integrally formed with the tube maintain the support segment in thermal contact with the tube. In a preferred embodiment, the tube has a generally streamlined oval cross section for utilization in heat exchanger apparatus such as air conditioner, refrigerator or heat pump, with the tubing arranged such that the minor axis of the oval extends perpendicular to external fluid flow and its major axis extends parallel therewith for reducing frictional drag and reducing stagnant regions of external fluid flow. Multiple blades fan out from opposite sides of the oval tubing along its two gently curving arcuate faces where fluid flow is relatively unimpeded.