Joints and connections – Member ends joined by inserted section – Fluted or splined section
Patent
1996-02-01
1998-01-06
Knight, Anthony
Joints and connections
Member ends joined by inserted section
Fluted or splined section
403300, 403292, F16B 704, F16B 2108
Patent
active
057047286
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to an inserted-and-linking assembly which connects several thin-walled welded tubes, and particularly to an assembly for linking up interconnecting tubes to form an assembly a floorlamp pole.
2. Description of the Related Art
It is well known that floorlamps are available in many different sizes and styles. All of them include one or several high lamp poles. With the lowest lamp pole, it is necessary for the lamp to illuminate reading materials held in readings on a lamp user's hands who may be sitting under the light, while with the highest lamp pole, the lamp over the heads of people with normal stature serves as the rooflight. A whole lamp pole is generally divided, when produced and packed, into smaller tubes in order to facilitate its transportation and compact the lamp package. Having bought a lamp of this kind, customers join the tubes one after another into one lamp pole.
Up to now, the prior art in connecting the tubes mostly utilize thread connection. The shortcomings of the art have been mentioned several times by approved Chinese utility model patent No. CN 922-1856.1 and CN 92225228.9. Here, a brief review about the shortcomings is listed:
(1) When the tubes are screwed together, the relative rotation angle is more than 360 degrees. This not only blocks the connection operation but also exceeds the maximum twisting angle for a lamp cord or wire within the tubes because the wire's twisting angle must be less than 360 degrees.
(2) Cutting the external (or internal) threads in tube walls prevents using very thin-walled tubes, which increases the weight and cost of the pole.
(3) When threading locally strengthened welded tubes on their walls, workers have to spend more working time on convex weld seams. Moreover, because the machinability in the seam and the welding heat affected region are not same with that in other regions, the quality of the whole thread degrades.
(4) Since a tube is generally painted following its threading, the threads are usually hindered by the paint. This makes the customer's assembly of the lamp pole difficult.
Approved Chinese utility model patent No. CN92225228.9 discloses a method of tube connection. The method disclosed is first, to shrink one end of one first tube of a pair and to punch an L-shaped guide groove thereon, then to punch a convex ball at the mouth of the second tube, with the convex ball forward along the longitudinal part of the L-shaped guide groove and at the corner of the groove turn and the second tube a certain angle along its radial part, so that the two tubes will not be able to pull part by axial loads within a limit.
Although this tube-linked structure avoids the problems of threaded connection, such as restriction of using very thin-walled tubes for threading, complexity of working process, rotation among the tubes, etc., it still has its own shortcomings in its practical application. For example, 1) as a result of the transition zone sloping from an intact part down to the shrunken end, the obvious profile discontinuity of two connected tubes is not in accord with requirements of high quality products; and 2) since no measures have been taken to prevent further relative motion in the opposite direction between the pairs of tubes, only a slight relative motion may cause release. Such a contruction has a tendancy to separate each time the lamp is lifted, frequently causing foot injury by the lampbase, which is typically several kilograms in weight.
SUMMARY OF THE INVENTION
Accordingly, it is the objects of the invention to overcome the disadvantages of the prior art and to provide a linking assembly for a lamp pole which shares the advantages of easy production, firm clasp, efficient fabrication, low costs, and convenient assembly.
In assembly, with aligning the tube having the socket with one having the plug and pushing the tubes against each other, one finishes pole connection at once with a click (the click can be sensed by the worker).
The lamp pole
REFERENCES:
patent: 139932 (1873-06-01), Sweetland
patent: 1051427 (1913-01-01), McCluskey
patent: 1797691 (1931-03-01), Merrill
patent: 2854744 (1958-10-01), Crockett
patent: 3342511 (1967-09-01), Galloway
patent: 3759623 (1973-09-01), Hesse
patent: 3964339 (1976-06-01), Antonio et al.
patent: 4068346 (1978-01-01), Binder
patent: 5016154 (1991-05-01), Leeyeh
patent: 5149149 (1992-09-01), Wu
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