Douglas Charles Brackett

US Patent:

53515676, Oct 4, 1994

Filed:

Nov 8, 1993

Appl. No.:

8/148492

Inventors:

Douglas C. Brackett - Portland ME

International Classification:

F16H 2118

US Classification:

74 49

Abstract:

A conjugate drive mechanism of a scotch yoke type motion converter includes a conjugate driver, which is rotatably mounted on a crankpin, and a bearing conjugate, which is mounted on a linearly movable shuttle. The conjugate driver moves relative to the bearing conjugate between a pair of end points. A motion arrester functions to arrest the motion of the conjugate driver as it reaches each of its end points of travel relative to the bearing conjugate.

US Patent:

53755669, Dec 27, 1994

Filed:

Nov 8, 1993

Appl. No.:

8/149032

Inventors:

Douglas C. Brackett - Portland ME

International Classification:

F16H 2118

US Classification:

123 555

Abstract:

A reciprocating piston internal combustion engine has a scotch yoke-type motion translator. The engine is horizontally opposed with each shuttle having a pair of pistons attached at the ends of a pair of oppositely extending arms. A centrally located aperture in the shuttle accommodates the crankpin and incorporates a pair of rack blocks bolted to the shuttle. The rack blocks mesh with mating epicycloidal/hypocycloidal sectors rotatably mounted upon a crankpin and forming the interface between crankshaft and shuttle. The cycle dynamics of the engine may be matched to the thermodynamics of a selected power cycle and fuel by adjusting the shape of the sectors and racks.

US Patent:

46853421, Aug 11, 1987

Filed:

May 15, 1985

Appl. No.:

6/734454

Inventors:

Douglas C. Brackett - Scarborough ME

International Classification:

F02G 106
F16H 2118

US Classification:

74 50

Abstract:

A device for converting linear motion to rotary motion or vice versa employs at least two bearing members mounted for rotation about a crankpin of a rotatable crank, each bearing member being in constant engagement with its own individual bearing surface. A shuttle, which is mounted for reciprocating linear movement, carries the bearing surfaces, which are located on opposite sides of the crankpin and are offset relative to each other. Because the bearing members are in constant engagement with their associated bearing surfaces, the linear motion of the shuttle is continuously converted into the rotary motion of the crank or vice versa.

US Patent:

47794720, Oct 25, 1988

Filed:

Oct 30, 1986

Appl. No.:

6/925757

Inventors:

Douglas C. Brackett - Portland ME

International Classification:

F16H 2118

US Classification:

74 50

Abstract:

A device for interconverting rectilinear and rotary motion is designed so as to reduce side thrust exerted on a frame by a slide as the slide reciprocates linearly relative to the frame and such rectilinear motion is converted into the rotary motion of a crank or vice versa. More particularly, an elongated opening, which receives a crankpin of the crank such that the crankpin moves back and forth along the elongated opening, is provided in a swing mounted for oscillatory movement relative to the slide. At least one arm is pivotally attached to the frame and to the swing so as to effect the oscillatory motion of the swing relative to the slide as the slide reciprocates relative to the frame. As the slide reciprocates relative to the frame, the orientation of the elongated opening relative to the slide is constantly varied.

US Patent:

45908125, May 27, 1986

Filed:

Jun 16, 1983

Appl. No.:

6/504934

Inventors:

Douglas C. Brackett - Manchester NH

International Classification:

F16H 2508
F16H 2516

US Classification:

74 55

Abstract:

A reciprocating slide carrying one fixed and one moveable rotary bearing in an open portion of the slide frame. A rotary crank connected to the moveable rotary bearing causes the slide to reciprocate when the crank is rotated and vice versa.

US Patent:

54450390, Aug 29, 1995

Filed:

Mar 18, 1994

Appl. No.:

8/210875

Inventors:

Douglas C. Brackett - Portland ME

International Classification:

F16H 2118

US Classification:

74 49

Abstract:

A scotch yoke type motion converter employs a shuttle movable in a reciprocating fashion along a rectilinear path and having an aperture therein. One side of the aperture is defined by a first trackable profile and an opposite side of the aperture is defined by a second trackable profile. A pair of conjugate drivers is rotatably mounted on a crankpin positioned within the aperture of the shuttle. The conjugate drivers have tracking profiles which are in meshing engagement with the trackable profiles of the shuttle. Each of the tracking profiles has an overhanging portion which overhangs the opposite conjugate driver.

US Patent:

54173094, May 23, 1995

Filed:

Nov 8, 1993

Appl. No.:

8/149064

Inventors:

Douglas C. Brackett - Portland ME

International Classification:

F01M 104

US Classification:

184 65

Abstract:

A conjugate drive mechanism of a scotch yoke type motion converter includes a conjugate driver, which is rotatably mounted on a crankpin, and a bearing conjugate, which is mounted on a linearly movable shuttle. The conjugate drive mechanism is lubricated by supplying lubricating fluid from a pressurized source to an interface between meshing portions of the bearing conjugate and the conjugate driver.

US Patent:

59382244, Aug 17, 1999

Filed:

Jan 10, 1997

Appl. No.:

8/778156

Inventors:

Douglas C. Brackett - Valrico FL

International Classification:

B62M 1900

US Classification:

280216

Abstract:

A device for transmitting power between mechanical movements which includes a fluid pump coupled to a first mechanical movement for pumping a fluid, a fluid motor coupled to a second mechanical movement and a manifold connecting the fluid pump and the fluid motor capable of conducting fluid output from the fluid pump to the fluid motor to drive the fluid motor and recirculate the fluid back to said fluid pump. Either the fluid pump and/or the fluid motor incorporates a conjugate drive motion translator. The power transmission is suitable for use on a bicycle replacing the typical gears and chain and preferably includes a shunt to permit the motor to override the pump, an apportionment valve to control the ratio of movement between a first and second mechanical movement, and a brake valve for stopping the second mechanical movement. Either the fluid pump and/or fluid motor may be of a variable output design incorporating a crankshaft of variable stroke, adjustable on-the-fly.