Allen M Shotwell

US Patent:

6386066, May 14, 2002

Filed:

Aug 11, 2000

Appl. No.:

09/637310

Inventors:

Allen M. Shotwell - Elizabeth PA 15037

International Classification:

F16C 304

US Classification:

74602, 74595, 74597, 74600, 74570, 74569, 4033591, 403356

Abstract:

A variable stroke crankshaft assembly includes a drive shaft surrounded by a sleeve. A crankshaft is disposed inside the drive shaft with the longitudinal axis of the crankshaft offset from the longitudinal axis of the drive shaft. A gear projecting outwardly from the crankshaft through a window in a drive shaft engages angled gear teeth on the inner surface of the sleeve allowing sliding movement of the sleeve relative to the drive shaft to rotate the crankshaft. A crankpin is attached to the crankshaft but offset from the rotational axis of the crankshaft. Rotational movement of the crankshaft with respect to the drive shaft thus pivots the crankpin with respect to the rotational axis of the drive shaft creating a crank stroke that may be varied by sliding the sleeve back and forth.

US Patent:

41131266, Sep 12, 1978

Filed:

Aug 19, 1977

Appl. No.:

5/826266

Inventors:

Allen M. Shotwell - Elizabeth PA

International Classification:

B60P 310

US Classification:

214450

Abstract:

A boat loader and unloader having a vertical column post adapted to be mounted on a usual trailer hitch at the rear of a vehicle. A horizontal bar is mounted on the top of the column post and has a pair of spaced roller assemblies mounted thereon. An elongated carriage formed by a pair of spaced parallel rail members is slidably and pivotally mounted on the horizontal bar by the roller assemblies. A reel assembly having a crank operated bar is adapted to be mounted transversely across and secured to the midportion of a boat. A take-up cable is attached to and extends between the reel bar and one end of the carriage. The other end of the carriage is adapted to be clamped to a boat transom when the boat is in a horizontal position on the ground with the carriage extending vertically downwardly from the top of the column post. Actuation of the crank operated bar winds the cable about the bar pivoting the boat about the clamped end of the carriage from a horizontal to a vertical upstanding position. The bottom of the boat then can be lifted upwardly manually to pivot the carriage from a vertical to an inverted horizontal position on top of the column post.