Illumination – Light source and modifier – Adjustable or repositionable light source or light source...
Patent
1990-10-29
1991-12-31
Lazarus, Ira S.
Illumination
Light source and modifier
Adjustable or repositionable light source or light source...
362391, 362427, F21V 2130
Patent
active
050776479
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a lamp holder for a low voltage lamp rotatable about an axis, having an insulating cap which has two connection terminals connected conductively to the lamp contacts and each having a receiving bore for a flexurally stiff conductor.
A lighting fixture with a lamp holder which is swivellable in the manner of a universal joint is known, for example, from German Utility Model 8,633,208. Arranged on the lamp holder at the end are conventional screw terminals into which the two conductor ends are inserted parallel to one another. The two flexurally stiff ends are multiply bent in such a way that the ends lie on the axis of rotation and can be supported in bearing bushes of a continuing conductor section.
WO-A-88/02460 also shows a lamp holder which is swivellable in the manner of a universal joint, with two electrically conductive rods projecting diametrically from the cap and being fixed in the cap. In the end region of each electrically conductive rod, the interior of which is accessible, there is provided a radial blind hole for receiving one of the two contact pins of the lamp to be inserted, so that the lamp can be placed directly on the electrically conductive rods. The outer ends of the electrically conductive rods are rotatably mounted in support pieces in the form of quarter-circle arcs, so that the first axis of rotation of the universal joint is defined by the rotary bearing of the curved support pieces.
It is now the object of the invention to facilitate the formation of an axis of rotation at the lamp holder.
This object is achieved according to the invention in that the two connection terminals of the cap form bearing bushes of the lamp holder and have conductor receiving bores aligned with one another.
Consequently, the conductor ends engaging in the bearing bushes form a bearing axis about which the holder is rotatable, so that by contrast with the prior art quoted above there is no need for the conductor adaptors together with the additional bearing bushes. Since low-voltage lighting fixtures of this type also serve decorative purposes, the result is a further advantage that it is possible to provide at the two connection terminals a second cap which is with respect to the axis of rotation.
Further, there arises a certain reversal of the carrier function, i.e. the connection terminals represent the carrier component for one or two caps, whereas normally the cap also forms the carrier component for the connection terminals. In a further preferred embodiment, it is envisaged that each cap is formed by a cylindrical disc having mounting bores diametrical to the disc axis, and that there are provided at each connection terminal perpendicular to the conductor receiving bore threaded pins which in each case project through a mounting bore of a cap. In this way, a structurally very simple, light embodiment is achieved, a shell, which can be latched to a cap disc, preferably providing an enveloping cover for one or both holders.
Commercial low-voltage lamps mostly have contact pins, so that the lamp holders have plug-in contacts, and therefore the caps have plug-in openings for the contact pins. A preferred embodiment of a lamp holder according to the invention having plug-in contacts now provides that each threaded pin penetrates a flat contact spring having a curved contact stud projecting into the plug-in opening of the contact pins. The clamping spring thus establishes both the electrical and also the frictiontight connection between the lamp and the lamp holder, it having emerged that so-called cold-mirror lamps, that is to say such as have a glazed reflector shade, and therefore a relatively high weight, are also perfectly clamped.
With regard to the state of the art quoted at the beginning, screw terminals are provided as connection terminals, which is also possible without any difficulty with regard to the lamp holder according to the invention. In this case, at least one of the two threaded pins can be formed by the clamping screw of the screw terminal. If a headless cla
REFERENCES:
patent: 1813863 (1931-07-01), Nightingale
patent: 4837667 (1989-06-01), Grau
Cole Richard R.
Lazarus Ira S.
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