Earth working – Tool – standard or connection – Plural tools
Reexamination Certificate
1999-09-22
2001-09-04
Novosad, Christopher J. (Department: 3671)
Earth working
Tool, standard or connection
Plural tools
C172S713000
Reexamination Certificate
active
06283224
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to ground working devices.
BACKGROUND OF THE INVENTION
A road resurfacing unit is disclosed in U.S. Pat. No. 5,795,096 issued Aug. 18, 1998, which uses teeth to rip a gravel road prior to separating coarse material from fine material and depositing the coarse material on the fine material. A difficulty with the design disclosed in the patent is that the teeth tend to wear. While the teeth may be individually replaced, this is time consuming. The inventor has proposed a solution to the wear problem of ground working equipment such as the road resurfacing unit disclosed in U.S. Pat. No. 5,795,096.
SUMMARY OF THE INVENTION
Therefore, in one aspect of the invention, there is provided a ground working device, comprising a frame having a lower surface, and plural individually retractable teeth secured to the frame and extending away from the surface in a ground contacting array.
Teeth for the ground working device are, in another aspect of the invention, formed as part of a retractable tooth assembly. A retractable tooth assembly according to a further aspect of the invention preferably comprises a tooth carrier on one end of which a tooth is slidably mounted, and on the other end of which is mounted a tooth position fixative, with a position adjustable rigid link connecting the tooth position fixative and the tooth.
The retractable tooth assembly preferably extends through the frame from a first side to a second side, the retractable tooth assembly being secured to the frame on the first side and the tooth forming a working end on the second side.
These and other aspects of the invention are described in the detailed description of the invention and claimed in the claims that follow.
REFERENCES:
patent: 4512090 (1985-04-01), Billings
patent: 4967850 (1990-11-01), Bargfrede et al.
patent: 5224555 (1993-07-01), Bain et al.
patent: 5259692 (1993-11-01), Beller et al.
patent: 5407014 (1995-04-01), Tranmer
patent: 5795096 (1998-08-01), Culver
Culver Larry G.
Gillard Ray W.
Lambert Anthony R.
Novosad Christopher J.
Road Badger Inc.
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