Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2191292 A
Publication typeGrant
Publication dateFeb 20, 1940
Filing dateDec 10, 1938
Priority dateDec 10, 1938
Publication numberUS 2191292 A, US 2191292A, US-A-2191292, US2191292 A, US2191292A
InventorsSpence Jr John Livingston
Original AssigneeLeventhal Patents Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Prefocus projection lamp
US 2191292 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Feb. 20, 1940. J. l.. SPENCE; JR

PREFOGUS PROJECTION LAMP Filed Dec. 10, 1938 INVENTOR BY i ATTORNEYS 45 Operation is as follows.

Patented Feb. 20, 1940 UNITED STATES PREFOCUS PROJECTION John Livingston Spence, Jr., Brooklyn, N. Y., as-

signor to Leventhal Patents, Inc., New York, N. Y., a corporation oi' Delaware Application December 10, 1938, Serial No. 244,970

. 3 Claims.

This invention relates to projection lamps and more especially to the means for positioning the lamp correctly and with a minimum of effort.

Projection lamps are made so that the motions 5 required in putting them into their sockets are three. First, bringing the base to a predetermined registering position with the socket. Second, pressing the lamp toward the base against a contact spring. Third, rotating the lamp to the operating position while it is under pressure.

When the lamp is small and particularly when the lamp during use must lie between other closely related parts, such as condensers and reflectors, it becomes diicult, if not impossible, vto

5 impart the final motion which is a motion of rotation under pressure. The reason is that the lamp cannot be properly gripped by the ngers.

My present invention makes possible the easy performance of this third operation by permitting one hand to apply the pressure while the other imparts the rotatory motion. 'I'he invention also makes possible the removal of the lamp in a simpler fashion than with present methods.

Other objects, novel features and advantages of this invention will become apparent from the following specication and accompanying drawing wherein Fig. 1 is a plan view showing the lamp in the position before rotation, Fig. 2 is a side elevation, partly in section, of Fig. 1, Fig. 3 is a plan view showing the lamp after rotation, Fig. 4 is a side elevation, partly in section, of Fig. 3, and Fig. 5 shows the operation with human hands.

Referring now to Figs. 1 and 2, the lamp I has a iiange 2 which has slotted holes 3 fitted over pins 4. To bring the lamp into place, it is necessary to push lamp I towards socket support 5 and against the pressure of a socket spring not shown. At the same time, the lamp I and its iiange 2 are rotated so that the narrow parts of the slots 3 engage the necks 6 of the pins 4. as shown at Figs. 3 and 4.

A notch 1 in the ange 2 receives the tongue 8 o! the lever 9 pivoted at pivot II.

One hand grasps the lamp I as at Fig. 5, places the slots 3 over the pins 4 and at the same time brings the notch 'I over the lever tongue 8. The lamp is pushed locked into the narrow neck of the slots. 'Ihe 5 lamp is then correctly in place.

Removal of the lamp involves simply reversing the motion of the lever, only one hand being necessary. The lamp, because of the spring pressure, is partly ejected after it has been rotated to l0 the position shown at Figs. 1 and 2.

Stops I0 may be provided to positively limit the motion of the lever.

The positions of notch and tongue may be reversed, Without in any way departing from the l5 spirit of the invention herein disclosed.

Having described my invention, I claim:

1. In combination, a spring-contact lamp socket, a support therefor, a lamp having a base y tting said socket under pressure and a prel0 focusing ange, a notch in the'rim of said flange, means for imparting rotary motion to the lamp while it is under pressure which consists of a pivoted lever supported adjacent to the said socket, said lever having a tongue which fits said 25 notch.

2. In combination, a spring-contact lamp socket, a support therefor, a lamp having a base fitting into said socket and a ange, means on said support engageable with said flange upon 30 rotation of the lamp to retain the lamp base in the socket, and a lever pivoted to said support, the end of said lever and said iiange being interconnected to effect rotation of said lamp by oscillation of said lever. 35

3. In combination, a. spring-contact lamp socket, a. support therefor, a lamp havinga base tting said socket and a flange member, said iiange member and support having interengageable means rendered effective upon rotation of 40 the lamp to retain the lamp base in the socket, and a. lever member pivoted to said support, one of said members having a notch and the other o1' said members having a tongue ntting thereinto whereby oscillation ofsaid lever eiIects rotation of said lamp.

JOHN m'vmos'roN sPnNcE. Jn.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2471190 *Aug 30, 1946May 24, 1949Rca CorpLamp socket
US2655797 *Mar 21, 1949Oct 20, 1953Gerald A HaleTimer apparatus for parking meters
US2657366 *Oct 31, 1952Oct 27, 1953Vry Corp DeMechanism for facilitating the removal of a lamp from its socket
US3054980 *Mar 20, 1958Sep 18, 1962Bryant Electric CoWiring device
US4283101 *Aug 6, 1979Aug 11, 1981Indicator Controls Corp.Rotatable lamp socket for incandescent pedestrian traffic signal, or the like
US4409749 *Sep 8, 1981Oct 18, 1983Hamu Kaino JStretch frame
US5347673 *Oct 1, 1992Sep 20, 1994Black & Decker Inc.Quick change pad assembly for orbital polisher
US5491618 *Aug 20, 1993Feb 13, 1996Lights Of America, Inc.Light fixture
US8328647Dec 11, 2012Schaeffler Technologies AG & Co. KGTorque converter leaf spring connections
US20100197412 *Aug 5, 2010Luk Lamellen Und Kupplungsbau Beteiligungs KgTorque converter leaf spring connections
WO2004046610A1 *Nov 13, 2003Jun 3, 2004Robe Show Lighting S.R.O.Attachment means for lighting equipment
U.S. Classification403/11, 362/382, 439/546, 403/19, 313/51
International ClassificationG03B21/20
Cooperative ClassificationG03B21/20
European ClassificationG03B21/20