Land vehicles – Wheeled – Extensible
Reexamination Certificate
2000-01-28
2001-02-13
English, Peter C. (Department: 3619)
Land vehicles
Wheeled
Extensible
C280S786000, C280S789000, C280S798000
Reexamination Certificate
active
06186533
ABSTRACT:
II. BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to monotubular chassis for trailers, and more particularly, to those used as a traction as well as a load supporting member.
2. Description of the Related Art
Many designs for vehicles' chassis or frame structures have been designed in the past. None of them, however, include a monotubular longitudinal member with a sufficiently large diameter to receive and support transverse handles without requiring any other member to keep the chassis structure substantially horizontal.
Applicant believes that the closest reference corresponds to U.S. Pat. No. 2,329,408 issued to George S. Minium (1943) for TRAILER TRUCK FRAME. The patented invention has only one tubular longitudinal member. However, the diameter is not large enough to support cross members passing therethrough. Minium's patent utilizes longitudinal beams
41
;
42
and
43
that are not required in the present invention.
Other patents describing the closest subject matter provide for a number of more or less complicated features that fail to solve the problem in an efficient and economical way. None of these patents suggest the novel features of the present invention.
III. SUMMARY OF THE INVENTION
It is one of the main objects of the present invention to provide a monotubular chassis or frame structure that supports structural cross members mounted perpendicularly therethrough and not requiring additional longitudinal members.
It is another object of this invention to provide a monotubular frame chassis that minimizes the weight of the resulting structure and maximizes the cargo to structure weight ratio.
It is still another object of the present invention to provide a sturdy monotubular chassis with minimum number of parts thus optimizing manufacturing costs and inventory logistics.
It is yet another object of this invention to provide such a device that is inexpensive to manufacture and maintain while retaining its effectiveness.
Further objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.
REFERENCES:
patent: 2113399 (1938-04-01), Dietrich
patent: 2152804 (1939-04-01), Hays
patent: 2329408 (1943-09-01), Minium
patent: 2344378 (1944-03-01), Wagner
patent: 4566714 (1986-01-01), De Witt et al.
Cormetal of USA, Inc.
English Peter C.
Sanchelima J.
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