Patent Application
20120193591
1. Field of Invention
The present invention relates to a telescopic apparatus and, more particularly, to a telescopic apparatus with two safe contact units.
2. Related Prior Art
Referring to
The positioning unit 20 includes a ring 21, a pin 22 and a nut 23. The ring 21 includes a rib 24 extending longitudinally on an internal face thereof. The nut 23 is engaged with the threaded section 14 of the first tube 11. The pin 22 is inserted through a selected one of the apertures 17, with two ends thereof located on the nut 23. The ring 21 is connected to an end of the first tube 11 near the threaded section 14, with the rib 24 movably located in the groove 17. As the nut 23 is spun and moved relative to the threaded section 14 of the first tube 11, the pin 22 and therefore the second tube 12 are moved relative to the first tube 11 by the nut 23.
Each of the contact units 30 includes a plug or cap 31 connected to the first tube 11 or the second tube 12, a screw 32 partially inserted in the plug or cap 31, a plate 33 formed with two lugs 35, and another screw 36 driven in the screw 32 through the lugs 35, and a pad 34 attached to the plate 33. The plate 33 is made of metal, and the pad 34 rubber. The total weight of the plate 33 and the pad 34 is considerable. The plate 33 and the pad 34 are pivotally connected to the screw 32. In maneuver of the telescopic apparatus 10, the plate 33 and the pad 34 are cast like the tip of a whip and could damage properties or hurt people.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
It is the primary objective of the present invention to provide a safe telescopic apparatus.
To achieve the foregoing objective, the telescopic apparatus includes two tubes, a positioning unit and two contact units. The tubes are telescopically connected to each other. The positioning unit is operable for moving and positioning the tubes relative to each other. Each of the contact units includes a cap secured to a relative one of the tubes and a pad pivotally and elastically connected to the cap.
The pad may include a rubber block and a metal plate partially embedded in the rubber block.
The metal plate may include a dome and a brim extending from and around the dome thereon. The entire brim is embedded in the rubber block.
The cap may include an arched end plate for containing the dome.
The pad may include a screw inserted through the dome and the arched end plate and a nut engaged with the screw.
The pad may include a helical spring compressed between an enlarged head of the screw and the dome.
The rubber block may include a chamber for containing the helical spring.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of the preferred embodiment versus the prior art referring to the drawings wherein:
Referring to
The positioning unit 50 includes a frame 51 firmly connected to the first tube 41, two fins 52 extending from the frame 51, a handle 53 pivotally connected to the frame 51, a first spring-biased detent 55 movably provided on the handle 53, a toothed wheel 54 rotationally provided on the fins 52, and a second sprig-biased detent movably provided on the fins 52.
In use, the handle 53 is pivoted to and fro relative to the fins 52. When the handle 53 is pivoted relative to the fins 52 in an active direction, the toothed wheel 54 is spun since it is engaged with the first spring-biased detent 55 and allowed to rattle on the second spring-biased detent. The second tube 42 is extended from the first tube 41 for a distance since some of the recesses 43 receive some of the teeth of the toothed wheel 54.
When the handle 53 is pivoted relative to the fins 52 in an opposite idle direction, the first spring-biased detent 55 rattles on the toothed wheel 54 as the toothed wheel 54 is retained in position by the second spring-biased detent. The second tube 42 is retained in position relative to the first tube 41.
Referring to
The pad 80 includes a metal plate 81 and a rubber block 84. The metal plate 81 includes a dome 82 and a brim 90 extending from and around the dome 82. An aperture 83 is centrally defined in the dome 82. A portion of the dome 82 and the entire brim 90 are embedded in the rubber block 84. The rubber block 84 includes a chamber 85 defined therein and ribs 89 formed thereon.
Referring to
Referring to
The present invention has been described via the detailed illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.
