U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Three-point hitch attached grader with adjustable blades

Patent 5191943 Issued on March 9, 1993. Estimated Expiration Date: Icon_subject August 22, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

1068155

Particulate material spreader with selectively detachable three-point linkage
Patent #: 4196778
Issued on: 04/08/1980
Inventor: Smith

Spreader/grader
Patent #: 4320988
Issued on: 03/23/1982
Inventor: Seal

Skid shoe for snow plow blade
Patent #: 4346528
Issued on: 08/31/1982
Inventor: Shwayder

Adjustable spreader-grader
Patent #: 4572301
Issued on: 02/25/1986
Inventor: Bourgeois, Jr.

Earth scraper for use with a small tractor
Patent #: 4630686
Issued on: 12/23/1986
Inventor: Ausmus, Jr.

Convertible spreader grader assembly
Patent #: 4655297
Issued on: 04/07/1987
Inventor: Bourgeois, Jr.

Landscape conditioning assembly
Patent #: 4850433
Issued on: 07/25/1989
Inventor: West

Soil leveling apparatus with improved scraper member
Patent #: 4924945
Issued on: 05/15/1990
Inventor: Mork

Eccentric dowel pin and pin-adjusted structure in hole type modular tooling systems Patent #: 4997303
Issued on: 03/05/1991
Inventor: Xu, et al.

Inventors

Application

No. 748524 filed on 08/22/1991

US Classes:

172/393, Spaced parallel runners with tool mounted therebetween172/445.1, Including blade, scraper, or smoother172/684.5, Frame-supported blade, scraper, or smoother drawn by vehicle172/744Vertically adjustable

Examiners

Primary: Reese, Randolph A.
Assistant: Warnick, Spencer

Attorney, Agent or Firm

International Classes

A01B 035/20
F16B 001/00

Abstract

A grader especially adapted for use in association with a tractor having a three-point hitch with the grader being capable of use in cutting, moving, spreading and leveling all types of soil, aggregate and the like. The grader can also be used to carry, spread and level hot and cold asphalt, soil, aggregate and the like. The grader has blades adjustable to a predetermined depth with the specific angle of the grader blades and the speed of movement in relation to the surface being worked determining the operational characteristics of the grader. The grader includes a pair of transversely extending blades oriented at a particular angle and being vertically adjustably attached to a pair of side frame members having ground engaging slide shoes along the lower surface thereof. The ends of the blades are vertically adjustably connected to the side frame members and provided with manually operated cam structures to adjust the blades vertically. The blades are mounted on an angled support bar in vertically adjusted positions to enable the position of the blades to be adjusted to compensate for wear.

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