Mark R Korin

US Patent:

6347779, Feb 19, 2002

Filed:

Apr 25, 2000

Appl. No.:

09/557702

Inventors:

Mark Korin - Oak Grove MN 55011

International Classification:

B65D 6300

US Classification:

248499, 248500, 410 3, 410 7

Abstract:

A pair of cams having helical ramps rotate on each other to produce an extension or retraction of the cams. A handle on one of the cams provides leverage for turning the cam to convert radial force to axial force. The cams can be used in conjunction with a shaft and ratchets to produce jacks. The cams can also be used to produce clamps such as for securing lids to containers. When a shaft is secured at one cam and connected to a trailer, truck or other vehicle bed, an object can be secured to the vehicle bed by the other cam engaging and placing a downward force on the object when in the extended position. When used as a clamp the cams can secured or release the object being held with a partial rotation of the cam. The cams are simple one piece devices having a bearing portion on one cam inserted into a bore on the other cam to provide concentric rotation of the cams. There are no moving parts to wear out or break.

US Patent:

51469979, Sep 15, 1992

Filed:

Dec 16, 1991

Appl. No.:

7/808109

Inventors:

Mark R. Korin - Blaine MN

International Classification:

A01B 3316
A01D 4400

US Classification:

172 42

Abstract:

A weed removing apparatus suitable for grubbing weeds from a lake bottom. The apparatus includes a land-based unit including a combustion engine driving an hydraulic pump, and a separate submersible unit including a hydraulic motor which is driven by the hydraulic pump of the land-based unit via an elongated hose. The submersible unit incluldes a rotatable drum including several tines extending radially outward therefrom for grubbing weeds and which is driven by the hydraulic motor. The submersible unit includes wheels which are propelled by the hydraulic motor. A handle extending from the submersible unit provides a steering mechanism to the operator for guiding the submersible unit about the lake bottom in the area desired to be cleared of weeds. The land-based unit further includes a take-up reel for storing a substantial length of hose when not in use. The hose also includes several spaced-apart flotation devices for buoying the hose upon the water surface to avoid entanglement and snaring about the lake bottom or with weeds.