Tent – canopy – umbrella – or cane – Umbrella – Ribs and stretchers
Reexamination Certificate
1999-09-29
2001-01-16
Canfield, Robert (Department: 3635)
Tent, canopy, umbrella, or cane
Umbrella
Ribs and stretchers
C135S027000, C135S029000
Reexamination Certificate
active
06173723
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to an improvement in the structure of a skeleton for umbrellas.
2. Description of the Prior Art
Referring to
FIG. 1
, the conventional skeleton for umbrellas generally includes a shank A
1
, a runner A
2
, a plurality of primary stretchers A
4
, a plurality of second stretchers A
3
, a plurality of connectors A
6
, and a plurality of ribs A
5
. The shank A
1
is an elongated member on which is slidably mounted the runner A
2
. The upper end of the runner A
2
is pivotally connected with a plurality of the second stretchers A
3
. The primary stretchers A
4
are pivotally connected at an end to a sleeve slidably mounted on the shank A
1
and located above the runner A
2
and at the other end to the connectors A
6
. The connectors A
6
are fixedly installed on the intermediate portions of the ribs A
5
. However, in case of strong wind, the canopy of the umbrella will be easily overturned and the ribs A
5
will be deformed or even broken thereby rendering the umbrella unfit for practical use.
Therefore, it is an object of the present invention to provide an improvement in the strict ire of a skeleton for umbrellas which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to an improvement in the structure of a skeleton for umbrellas.
It is the primary object of the present invention to provide an improved skeleton for umbrellas which utilizes a plurality reinforcing arms to reinforce the strength of the ribs for withstanding the wind force.
It is another object of the present invention to provide an improved skeleton for umbrellas which can lessen the force applied by the wind to the rib by means of moving the fulcrum from the first end to the second end of the reinforcing arm.
It is still another object of the present invention to provide an improved skeleton for umbrellas wherein the reinforcing arm is configured to engage with the lower side of the rib for reinforcing the rib.
It is still another object of the present invention to provide an improved skeleton for umbrellas which can facilitate the restoration of the canopy.
It is still another object of the present invention to provide an improved skeleton for umbrellas which is simple in construction and low in cost.
It is a further object of the present invention to provide an improved skeleton for umbrellas which is fit for practical use.
According to a preferred embodiment of the present invention, a skeleton for umbrellas includes an elongated shank, a runner slidably mounted on the shank, a sleeve slidably fitted on the shank and arranged above the runner, a spring disposed between the runner and the sleeve, and a joint fixedly secured to an upper end of the shank, characterized in that a plurality of primary stretchers are pivotally connected with the sleeve, a plurality of secondary stretchers having an end pivotally connected with an upper end of the runner and having another end pivotally connected with an intermediate portion of a respective one of the primary stretchers, a plurality of reinforcing arms pivotally connected at a first end thereof with another end of a respective one of the primary stretchers, and a plurality of ribs pivotally connected at an end with the joint and pivotally connected with a second end of a respective one of the reinforcing arms.
The foregoing objects and summary provide only a brief introduction to the present invention. To filly 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: 843092 (1907-02-01), McGuire
patent: 950913 (1910-03-01), Hartzell
patent: 990551 (1911-04-01), Hartzell
patent: 1096647 (1914-05-01), Stein
patent: 1206667 (1916-11-01), Carlson
patent: 1397794 (1921-11-01), Chase
patent: 1964292 (1934-06-01), Livingston
patent: 3780748 (1973-12-01), Weber
patent: 3902514 (1975-09-01), Weber
patent: 5435331 (1995-07-01), Okuda
patent: 5553634 (1996-09-01), Yang
patent: 5836328 (1998-11-01), Lee
patent: 6058952 (2000-05-01), Lin et al.
patent: 771518 (1957-04-01), None
A & J
Canfield Robert
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