Tent – canopy – umbrella – or cane – Umbrella – Mechanically operated
Reexamination Certificate
2000-08-23
2001-11-06
Canfield, Robert (Department: 3635)
Tent, canopy, umbrella, or cane
Umbrella
Mechanically operated
C248S514000
Reexamination Certificate
active
06311705
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a parasol, such as a beach parasol, and in particular to a device for controlling the orientation or tilting angle of the canopy of a large-sized parasol.
BACKGROUND OF THE INVENTION
A large-sized parasol, such as a beach parasol, usually includes an upright central post on a top end of which a large-sized canopy is attached. Some of the large-sized parasols are devised to control the orientation or tilting angle of the canopy for achieving most desired sun-shading effect.
A conventional device for controlling and adjusting the tilting angle of a parasol canopy comprises a pivotal connection between upper and lower segments of a central post of the parasol. Spring-biased retaining means is provided in the central post for manually controlling the tilt of the canopy. Such a conventional control device, however, is difficult to operate for it requires an operator to control and operate the device with both hands. Furthermore, the canopy can only be retained in a limited number of angular positions with respect to the central post. Stepless control is in general impossible.
Another conventional device employs a rope-and-pulley system which allows a stepless control/adjustment of the tilting angle of the canopy of a parasol. However, such a rope-and-pulley system requires a number of parts, complicating the structure, increasing costs and reducing liablility. The service life may thus be shortened and frequent maintenance is required.
It is thus desirable to provide a tilt control device for controlling the tilting angle of a canopy of a large-sized parasol which overcomes the above-discussed problems.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a parasol tilt control device having a simple and reliable structure.
Another object of the present invention is to provide a parasol tilt control device allowing a stepless control of tilting angle of the parasol.
A further object of the present invention is to provide a parasol tilt control device capable to be operated by a single hand.
To achieve the above objects, in accordance with the present invention, there is provided a tilt control device to be incorporated in a parasol for controlling tilting angle of a canopy of the parasol with respect to a central post of the parasol. The central post comprises an upper segment to which the canopy is attached and a lower segment pivoted to the upper segment fir supporting the canopy. The tilt control device comprises an operating ring rotatably mounted on the lower segment and forming an inner ring gear. A transmission shaft has a lower end forming an input gear mating the inner ring gear and an upper end forming a worm. A gear system is mounted to the second segment, including an output gear mounted to the pivotal pin of the upper segment and fixed to the upper segment and a worm gear mating the worm whereby rotation of the operating ring is transferred to the output gear via the transmission shaft and the gear system for moving the upper segment with respect to the lower segment.
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patent: 6230724 (2001-05-01), Lai
patent: 2259192 (1974-06-01), None
Canfield Robert
Rosenberg , Klein & Lee
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