Illumination – Light source and modifier – Adjustable or repositionable light source or light source...
Reexamination Certificate
2000-02-15
2001-08-07
Husar, Stephen (Department: 2875)
Illumination
Light source and modifier
Adjustable or repositionable light source or light source...
C362S413000, C362S414000, C362S427000, C285S907000
Reexamination Certificate
active
06270238
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention is related to a durable pivotal connecting device for a table lamp between the base and the supporting post of the lamp. The present invention is especially related to a pivotal connecting device taking advantage of the elastic nature of a plurality of bendable spring leaves in assembling an adjusting bolt, a transverse bar and two connecting rods in a linking mode, thereby, frictional resistance at the contact area between a rotation seat and the spring leaves can be controlled to tightly bind and fix or release the rotation seat for the supporting post to get a function of adjustment in rotation angle.
2. Description of the Prior Art
A conventional table lamp seen in the markets is provided on one end of the supporting post with a lampshade and a lamp pipe, while the other end thereof is pivotally mounted on the base of the lamp set, these form the main part of the table lamp. However, no matter the base of the lamp set is placed on or is clamped on a table, there is normally a pivotal connecting structure between the base and the supporting post for such purpose as that the supporting post can be rotationally adjusted for an ideal angle of illumination of the light toward the table. While pivotal connecting structures between bases and supporting posts on the table lamps seen in the markets mostly use the mode of connection with screws and nuts for assembling to have the main and subordinate rotating axles locked in positions in a given looseness of mating, and a conventional effect of adjusting the supporting posts relative to the bases can be obtained. However, the conventional pivotal connecting structures are not durable, the supporting posts are frequently adjusted directly with hands, and the axle pipes of the pivotal connecting structures are assembled and controlled for their tightness of binding with screws and nuts; thereby, pivotal connecting of the supporting posts on the bases will become loose after a long period of use with frequent adjusting, and are unable to get fixed positions with enough frictional resistance any more. Although users can use tools such as screw drivers to adjust the screws and nuts on the loosened pivotal connecting structures to recover suitable tightness of binding of the supporting posts against the bases, it is surely known that, adjustment of tightness of binding between the main and subordinate rotating axles taking advantage of their threads can not afford frictional resistance required in continuous rotational adjustment of the lamp set supporting posts. The pivotal connecting structures certainly will get loose again and again; this shows that durability of the conventional pivotal connecting structures is inferior.
SUMMARY OF THE INVENTION
In view of the above statement, to completely solve the problem of deficiency in durability and stability of a pivotal connecting structure is the motive of studying of the present invention. And thereby, the main object of the present invention is to design and provide a pivotal connecting device with better durability and stability in favor of adjustment of a user.
Another object of the present invention is to provide a pivotal connecting device with better durability and stability in favor of adjustment of a user taking advantage of the principle of frictional braking function generated by braking shoes together with that of elastic compressing and restoring of curved spring leaves.
The pivotal connecting device of the present invention actually is not limited to mating of a supporting post and a base, rather, it points to providing of a cylindrical rotation seat between the supporting post and the base. By assembling of the cylindrical rotation seat in the pivotal connecting device of the present invention, convenience of adjustment and durability of the pivotal connecting device can be improved.
The present invention will be apparent after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.
REFERENCES:
patent: 5065297 (1991-11-01), Santambrogio
patent: 5611510 (1997-03-01), Yamamoto
patent: 5695271 (1997-12-01), Zeller
Lee Simon A. H.
Mendelsohn Fred M.
Enviromental Lighting Concepts, Inc.
Fisher, III Arhur W.
Husar Stephen
Ward John Anthony
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