Structure of the main shaft of an umbrella

Details Structure of the main shaft of an umbrella Structure of the main shaft of an umbrella

2000-04-04

2001-12-18

Stephan, Beth A. (Department: 3635)

Tent, canopy, umbrella, or cane

Umbrella

Combined

C135S025400, C135S098000, C135S120300, C135S114000

Reexamination Certificate

active

06330887

ABSTRACT:

BACKGROUND OF THE INVENTION
a)Technical Field of the Invention
The present invention relates to an improved structure of the main shaft of an umbrella.
b) Description of the Prior Art
FIG. 1
shows a conventional collapsible, large size umbrella comprising a main shaft A
1
and an auxiliary extension shaft A
2
. The bottom section of the main shaft A
1
is provided with a positioning elastic ball A
11
which positions the extension shaft A
2
at the position hole A
21
after the main shaft A
1
is inserted thereto. The rotating eccentric pressing shaft A
3
at the top end of the extension shaft A
2
is used to mount the main shaft A
1
to the extension shaft A
2
. The eccentric pressing shaft A
3
is urged by a press shaft A
31
to eccentrically secure with the extension shaft A
2
. Loosening the press shaft A
31
causes the main shaft A
1
to disengage from the extension shaft A
2
and the umbrella structure can be unloaded.
The drawbacks of the conventional collapsible umbrella are as follows:
1) As the conventional umbrella requires two parts for combination to form the entire umbrella, the manufacturing of elements is complicated. As a result, unnecessary cost of production will occur.
2) As a result of the two independent parts of the umbrella, it is possible that one of the parts may be displaced, and the umbrella cannot be used.
3) Due to the weight of the umbrella, it is rather troublesome to assemble the two independent parts under strong wind environment
4) The rotating eccentric pressing shaft A
3
provides insufficient stress and therefore, connection of the main shaft A
1
and the extension shaft A
2
by urging is weak, and the umbrella may fall down as a result of accidental impact.
5) After a long period of use of the umbrella, the main shaft A
1
may be dented, and the urging by the rotating eccentric pressing shaft A
3
is weak.
6) The dented main shaft A
1
of the umbrella may be eroded in due course.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure of the main shaft of a large size umbrella comprising an umbrella structure and an eccentric engaging element, characterized in that the umbrella structure includes an umbrella body, the main shaft, an inner shaft and the eccentric engaging element includes an eccentric rotating gear cover and an eccentric shaft, and the eccentric rotating shaft is mounted within an eccentric slot of the eccentric shaft and is disposed at an eccentric post, which provides restriction and rotatably mounting function, a tolerance slot is provided at the eccentric rotating gear cover, and the edge of the eccentric rotating gear slot is threaded and the bottom section thereof is provided with an arch-shaped notch, which is corresponding to a protruded blocking section located at the bottom edge of the eccentric shaft, and the eccentric engaging element is mounted at the head end of the inner shaft and the inner shaft is located within the hollow body of the main shaft, a rolling slot is provided at the lower section of the main shaft to restrict the eccentric engaging element to avoid the dislocation of the inner shaft, thereby a retractable shaft structure for the large size umbrella is obtained.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.


REFERENCES:
patent: 4836232 (1989-06-01), De Rosa
patent: 5152495 (1992-10-01), Jacinto
patent: 5156369 (1992-10-01), Tizzoni
patent: 5293889 (1994-03-01), Hall et al.
patent: 5396915 (1995-03-01), Bomar
patent: 5906077 (1999-05-01), Adriarena
patent: 5964237 (1999-10-01), Lin
patent: 6073642 (2000-06-01), Huang

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