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Publication numberUS3425027 A
Publication typeGrant
Publication dateJan 28, 1969
Filing dateJul 3, 1967
Priority dateJul 3, 1967
Publication numberUS 3425027 A, US 3425027A, US-A-3425027, US3425027 A, US3425027A
InventorsJames S Lott Jr, Edward C Uberbacher
Original AssigneeIbm
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plug-in panel lamp
US 3425027 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)


BY w ATTORNEY EDWARD JAMES United States Patent 4 Claims ABSTRACT OF THE DISCLOSURE This specification describes a lamp with a bulb which with its leads is held in position in a housing by a sleeve that surrounds the housing and is shrink-fitted to grasp the bulb and the leads.

Background of the invention The present invention relates to the assembly of electrical components and more particularly to the assembly of lamps that can be plugged into panels or the like.

The most unreliable portion of a plug-in lamp is usually the light bulb itself and when the light bulb fails the whole lamp is generally thrown away. Therefore, it is desirable to minimize the cost and number of ancillary parts needed to provide the plugging in capability. These ancillary parts not only add to the cost of the lamp but in addition decrease reliability of the lamp since they themselves may fail and they require the attaching of the bulb or its leads to contacts or terminals thereby int-roducing the possibility of damaging the bulbs or the leads during manufacture.

Therefore it is an object of the present invention to provide a new lamp.

It is another object of the present invention to provide new means for mounting small lamps.

It is still another object of the invention to provide means for plugging lamps into panels.

Summary -In accordance with the present invention a new panel lamp is provided which is electrically and mechanically reliable, yet is simple and inexpensive to fabricate. In this lamp, the front end of a bulb extends from an opening at one end of a housing While the leads for the bulb extend through holes in the other end or base of the housing and are bent around the peripheral edge of the housing so they are against the sides of the housing. A sleeve is then shrink-fitted to the housing and the bulb so as to retain the bulb in the housing and the leads in position between the housing and the sleeve. This lamp can therefore be plugged in by inserting pins through the holes in the base of the housing so that the pins are forced up against the leads. Furthermore, the lamp consists of only three parts, the bulb, the housing and the sleeve, and there is no need for the usual glueing or mechanical retention schemes to hold the bulb within the housing.

Description of the drawing The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of the preferred embodiment of the invention as illustrated in the accompanying drawing which is a perspective of a lamp that is broken away to show its construction.

Description of the preferred embodiment Referring to the drawing, a bulb 10, having filament 12 with leads 14 which pass through the glass enclosure 7 of the bulb 10, is mounted in a cavity of a cylindrical ice nylon housing 16 with the front end of the bulb 10 protruding from the open end of the housing 16 and the back end of the bulb 10 positioned against the closed end of the housing 16. The leads 14 for the bulb 10 extend from the back of the bulb through openings 18 in the closed end or base 20 of the housing 16 and are bent around the base end of the housing so that their tips 14a are positioned axially against the side wall of the housing 16. With the bulb 10 so mounted within the housing 16, the housing and the bulb are placed within a plastic sleeve 22 which is then shrink-fitted to the housing 16 and the bulb 10. The sleeve 22 is long enough to overlie a portion of the exposed end of the bulb 10 and the tips 14a of the leads. Therefore, when the sleeve 22 is shrink-fitted, it tenaciously grabs the bulb at the open end of the housing so the bulb is retained within the housing and also holds the tips 14a between the sleeve 22 and the housing 16 in the desired position.

A suitable material for the tubing forming sleeve is a. heat shrinkable polyvinyldinefluoride which is bought in an oversized diameter and placed around the housing 16 and the bulb 10 as previously described. Then the sleeve is heated by a hot air blower or a low temperature oven until the sleeve shrinks and becomes fitted to the housing and the bulb are placed within a plastic sleeve 22 assembly.

A liquid expandable plastic tubing may be used as the material of the sleeve 22 in place of the heat shrinkable plastic. If such a liquid expandable plastic is used, the sleeve is bought in its desired final dimensions, wetted so that it expands to fit on the bulb 10 and housing 16 and then is allowed to dry after it has been placed on the bulb 10 and housing 16 so that it shrinks back to its initial dimensions and grasps the bulb and the leads as described previously.

Once assembled, the lamp may be inserted on pins such as pins 24 by forcing the pins through the openings 18 for the leads. Preferably the openings 18 are smaller in diameter than the pins 24 so as to force the leads 14 against the side walls of the openings and thereby obtain a good electrical contact between the pins 24 and the leads 14. Nylon was chosen as the material of the housing because it offered lubrication for the pins and presented the proper feel when the pins were inserted through the housing. However other suitable materials can be used if desired.

While the invention has been particularly shown and described with reference to the preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

What is claimed is:

1. In a lamp assembly having a light bulb projecting from one end of a housing with contacts at its other end for making electrical connections to the light bulb, the improvement which comprises:

leads for the light bulb that pass through apertures in said other end and have tips extending along the outside of the housing; and

a sleeve which is positioned around the housing so that it overlies the bulb at the one end of the housing :and the tips at the other end of the housing andis shrink-fitted to said housing so as to clamp the tips between the sleeve and the housing and the bulb in the housing.

2. The lamp of claim 1 wherein said sleeve is a heat shrinkable material.

3. The lamp of claim 1 wherein said sleeve is a liquid "expandable material.

4. The lamp of claim 1 wherein said apertures are receptacles for electrical probes that provide excitation to the bulb.

References Cited UNITED STATES PATENTS Capel 339-103 X 5/1967 Booker 174-84 5/1961 Williams 340--38l FOREIGN PATENTS 1/1957 France.

RICHARD E. MOORE, Primary Examiner.

US. Cl. X.R.

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3548243 *Jun 21, 1968Dec 15, 1970Magherini DinoElectric light bulb and terminal cap assembly
US3555342 *Feb 11, 1969Jan 12, 1971Westinghouse Electric CorpSingle-ended incandescent projection lamp having dual series-connected filaments and an integral gripping cap
US3591793 *Dec 23, 1968Jul 6, 1971Jack D MckimPanel light assembly
US4568854 *Oct 27, 1983Feb 4, 1986Gte Products CorporationTungsten halogen lamp with heat-dissipating base
US5464354 *Feb 1, 1994Nov 7, 1995Akman; Alp T.Parallel and series plugs and wiring segments for ballon display
US5989067 *Jan 30, 1998Nov 23, 1999LightolierHalogen lamp pin shroud
US7787485Feb 8, 2007Aug 31, 2010Lutron Electronics Co., Ltd.Method of transmitting a high-priority message in a lighting control system
US7883261 *Oct 20, 2008Feb 8, 20111 Energy Solutions, Inc.Water-resistant and replaceable LED lamps
US8033857 *Jul 23, 2009Oct 11, 2011Dragon Energy Pte. Ltd.Base tile
US8314564Apr 28, 2009Nov 20, 20121 Energy Solutions, Inc.Capacitive full-wave circuit for LED light strings
US8376606Oct 30, 2009Feb 19, 20131 Energy Solutions, Inc.Water resistant and replaceable LED lamps for light strings
US8388213Dec 6, 2011Mar 5, 20131 Energy Solutions, Inc.Substantially inseparable LED lamp assembly
US8723432May 29, 2012May 13, 20141 Energy Solutions, Inc.Capacitive full-wave circuit for LED light strings
US8823270Aug 19, 2011Sep 2, 20141 Energy Solutions, Inc.Interchangeable LED bulbs
US8836224Jul 13, 2010Sep 16, 20141 Energy Solutions, Inc.Compact converter plug for LED light strings
US9226351Sep 15, 2014Dec 29, 20151 Energy Solutions, Inc.Compact converter plug for LED light strings
US20080192767 *Feb 8, 2007Aug 14, 2008Howe William HMethod of transmitting a high-priority message in a lighting control system
US20090251923 *Oct 20, 2008Oct 8, 2009Jing Jing YuWater-resistant and replaceable led lamps
US20100068926 *Jul 23, 2009Mar 18, 2010Christopher George Edward NightingaleBase Tile
US20100073963 *Oct 30, 2009Mar 25, 2010Jing Jing YuWater Resistant and Replaceable LED Lamps for Light Strings
US20100109560 *Apr 28, 2009May 6, 2010Jing Jing YuCapacitive Full-Wave Circuit for LED Light Strings
US20110051471 *Jul 13, 2010Mar 3, 2011Long ChenCompact inverter plug for led light strings
U.S. Classification439/619, 313/318.5
International ClassificationH01K1/46, H01R33/09
Cooperative ClassificationH01K1/46, H01R33/09
European ClassificationH01R33/09, H01K1/46