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Publication numberUS3067399 A
Publication typeGrant
Publication dateDec 4, 1962
Filing dateJun 10, 1959
Priority dateJun 10, 1959
Publication numberUS 3067399 A, US 3067399A, US-A-3067399, US3067399 A, US3067399A
InventorsMasanao Matsui
Original AssigneeArgus Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lamp socket for flash guns
US 3067399 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Dec. 4, 1962 MASANAO MATSUI LAMP SOCKET FOR FLASH GUNS 5 Sheets-Sheet 1 Filed June 10, 1959 .Jlv K/ ATTORNEY .5

Dec. 4, 1962 MASANAO MATSUI 3,067,399

LAMP SOCKET FOR FLASH GUNS Filed June 10, 1959 3-Sheets-Sheet 2 1962 MASANAO MATSUI 3,067,399

LAMP SOCKET FOR FLASH GUNS Filed June 10, 1959 3 Sheets-Sheet 3 INVENTOR Maw/v40 4/475 ATTORNEY 5 United States Patent Delaware Filed June 10, 1959, Ser. No. 819,282 6 Claims. (Cl. 339-33) This invention relates to a multiple socket structure for releasably holding one or the other of a plurality of lamp bulbs and is particularly concerned with special quick locking and release arrangements in such sockets.

In its preferred embodiment the invention will be disclosed as a dual socket adapted to receive either a bayonet type socket lamp bulb or a lamp bulb having a circumferential locking recess in the base, either type being inserted into the socket with a straight axial push until latched and readily released and ejected by a common push button control.

It is therefore the major object of this invention to provide a novel socket structure adapted to releasably receive and hold two different types of lamp bulb bases and having special release and ejector arrangements.

A further object of the invention is to provide a novel socket structure for a photoflash gun or the like wherein -a socket member for a small size lamp is movably mounted for displacement by insertion of a larger size A further object of the invention is to provide a novel dual socket structure for a photoflash gun or the like wherein a socket member for receiving the base of one type of lamp is axially slidable so as to be displaced by insertion of the base of another type of lamp, wherein locking means, either the same or separately acting devices, releasably latches either lamp'base upon axial insertion thereof into the socket, and wherein a single control is provided for releasing whichever lamp is in the socket.

Further objects of the invention will appear as' the description proceeds in connection with the appended claims and the annexed drawings wherein:

FIGUREl is a section on line 1-1 of FIGURE 3 showing a dual socket according to a preferred embodiment of the invention with a small sized lamp bulb inserted;

FIGURE 2 is a section essentially on line 2-2 of FIGURE 1 showing further socket detail;

FIGURE 3 is a front view taken on line 33 of FIG- URE 1;

FIGURE 4 is a sectional view like FIGURE 1 but showing a bayonet base bulb inserted into the socket;

FIGURE 5- is a section showing another embodiment of dual socket with the small bulb inserted;

FIGURE 6 is a section showing a bayonet bulb inserted into the FIGURE 5 socket;

FIGURE 7 is a front elevation looking on line 7--7 of FIGURE 6;

FIGURE 8 is a section of a socket according to a further embodiment of the invention with a small bulb inserted;

FIGURE 9 is a section according to FIGURE 8 but with a large bulb inserted; and

FIGURE 10 is a rear elevation of the socket of FIG- URES 8 and 9 showing socket contact and release button detail.

Referring to FIGURES 1-4, a photoflash gun casing 11 has a forwardly opening cylindrical bore 12 formed with at least one axially extending internal groove 13 into which projects a radial pin 14 on an inner socket member 15 that is axially slidable within bore 12. The engagement of pin 14 in groove 13 prevents rotation of socket member 15 about its axis.


Socket member 15 is preferably a hollow cylinder with its outer periphery slidable along bore 12 and its inner periphery of such size as to slidably receive the cylindrical base 16 of a small lamp 17. This lamp is of the type now being widely used, known as the M-2 flashlamp, and its base at the end away from the bulb has formed a circular latching recess 18.

A longitudinal slot 19 is formed in the upper side Wall of socket member 15 open rearwardly and terminating forwardly in an inclined stop face 21.

A fixed center post 22 on the casing has an internal guide bore 23 to axially slidably mount a metal center contact member 24 that is resiliently forwardly biased by a spring 25 bearing against the rear casing wall 26. A flange 27 on contact member 24 encounters casing flange 28 to limit forward displacement of the contact member 24. Post 22 is preferably an integral part of casing 11 as shown in FIGURE 1.

As shown in FIGURE 2 the socket member 15 is forwardly axially biased by a spring 29 that extends through a casing slot 31 to dispose opposite end arms 32 and 33 respectively in a recess on socket member 15 and against an internal face 35 on the casing. Abutment of spring arm 32 with internal surface 35 of the casing limits forward movement of socket member 15. Any equivalent biasing spring may be used here.

A latch lever 36 is pivoted within the casing at 37 and has at the forward end a detent 38 adapted to pass through slot 19 of the socket member into bore 39 of the socket member where it presents an inclined cam surface 41 facing forwardly in the socket. Lever 36 is biased counterclockwise in FIGURE 1 by spring 42 reacting between it and the casing, and face 21 serves as a stop for detent 38 as shown in FIGURE 1 to limit latching movement of lever 36.

Lever 36, which is preferably a bell crank, is formed at the end opposite the detent 38 with a laterally projecting arm 43 that engages a manual push-button 44 slidably disposed in wall 26. When button 44 is pushed to the left in FIGURES 1 and 4, lever 36 is rocked clockwise at the same time compressing spring 42.

FIGURE 1 shows the action of the socket in mounting the so-called M-2 or small lamp 17 having the annular latching recess 18 in its base. The lamp .17 is thrust directly axially through bore 13 to insert its base slidably in bore 39. Engagement of the front edge of the lamp base with lever cam surface 41 sufliciently rocks lever 36 against its spring bias to allow full insertion of the base, and detent 38 springs into latching engagement with recess 18. By this time the usual center contact of the base has engaged contact member 24 which is resiliently biased by now compressed spring 25 to maintain engagement and electrical contact.

After the lamp has been fired it is released and ejected simply by pressing button 44 to rock detent 38 out of the recess 18 so that spring 25 may expand and push the lamp free of the socket. During this action of insertion or release of the small lamp 17 there is no axial shift of socket member 15.

FIGURE 4 shows the action of the socket in mounting a larger lamp 45 having a base provided with diametrically opposite bayonet pins 46. The lamp is thrust axially into the bore 13 with pins 46 disposed in grooves 13. At first the front end of the lamp base, which is larger in diameter than bore 39, engages socket member 15 and slides it rearwardly. Face 21 cams lever 36 to rock clockwise out of slot 19 and detent 38 rides along the outer peripheries of socket member 15 and the lamp base until cam surface 41 contacts pin 46 to further rock lever 36 clockwise. Then after passage of the pin 46 the detent 38 drops onto the lamp base to latch over the pin and since the center contact of the lamp has now engaged contact member 24 and compressed spring 28, the lamp 45 is now latched in the socket. There is no relative rotation of the lamp base and socket member 15.

In order to release lamp 45, the operator pushes on the same button 44 and this rocks detent 38 away from pin 46 to allow ejection spring 25 to push the lamp for.- wardly clear of the socket. If desired spring 25 may be strong enough to eject either lamp entirely out of the socket structure.

FIGURES 7 illustrate a further embodiment. The casing 47 has a forwardly opening bore 48 formed with diametrically opposite grooves 49 the upper of which receives a pin 51 on the annular socket member 52 which is thereby slidably and non-rotatably mounted on the casing. The casing is slotted at 53 so that a lever 54 pivoted at 55 may extend through slot 56 of the socket member 52 to dispose detent 57 in annular base recess 13 of the small lamp when the latter is thrust into the socket. A biasing spring 58 normally urges the lever 54 to latched position.

FIGURE 7 illustrates that slot 56 and lever 54 are slightly angularly displaced so that they will not interfere with the bayonet lamp socket hereinafter described. When the lamp 17 is in latched position as in FIGURE 5 its center contact engages metal contact 59 of the casing which is secured on the end of a compressed ejection spring 61 projecting from the rear wall of the casing.

When the larger bayonet base lamp 45 is thrust into the socket with pins 46 sliding in grooves 49 the end of the base engages socket element 52 to slide it rearwardly. A bell crank lever '62 pivoted on the casing at 60 has one arm 63 formed with an aperture 64 and an inclined cam face 65. The other arm 66 is apertured at 67 to clear the center contact and normally spring biased into contact with manual push button 68 by a compression spring 69. Arm 66 has a forwardly extending tab 71 adapted to be engaged by lever 54 (FIGURE 5).

When lamp 45 is inserted the upper pin 46 engages face 65 and rocks the lever 62 clockwise sufiiciently to enable pin 46 to align with aperture 64, at which time spring 69 acts to latch arm 63 to the lamp base. By this time, FIGURE 6, lever 54 has been moved out of the path of the lamp base.

With either lamp in position release is effected by pushing button 68. In the FIGURE 5 condition this rocks lever 54 clockwise to release detent 57 from recess 18 and enable spring 61 to eject lamp 17. In the FIGURE 6 condition arm 63 is rocked to remove aperture 64 from pin 46 and spring 61 ejects lamp 45-.

Socket 52 in FIGURES 5-7 is suitably biased forwardly by the U-shaped spring arrangement shown at 88 in FIGURE 10.

Referring now to the embodiment of FIGURES 8-10 which is like that of FIGURES 57 except that the manual push button is here integral with the release lever, the casing 47 has forwardly opening bore 48 in which socket element 52 is slidably non-rotatably mounted as in FIGURES 57. Lever 54 extends through slot 56 and is biased by spring 58.

The release lever 72 is pivoted within the casing at 73 and biased counterclockwise by spring 74. Near its for: ward end arm 75 of lever 72 is formed with an aperture '76 for pin 46 and a cam face 77. The end of other arm 78 of lever 72 is provided with a tab 79 adapted to engage lever 54. So far the structure is like FIGURES 57.

In this embodiment the rear casing wall has a large aperture and the rear side of arm 78 has secured thereto a button 82 available for manual operation, The center contact and ejector spring in this embodiment is a blade '83 of spring metal anchored to the casing at 84 and having a lamp contact engaging tip 85.

Also in this embodiment it will be observed that the socket member 52 has guide pins 86 sli-dable in internal casing slots 87, and a U-shaped spring 88 anchored at 39 bears against pins 86 to urge the socket member 52 to the left in FIGURES 8 and 9.

Operation of this embodiment is essentially the same as in FIGURES 5-7.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is:

1. In a photoflash device having a casing provided with internal dual socket structure facing a front opening formed with a bore of such size as to receive the base of a standard bayonet base fiashlamp, said bore having at least one longitudinal slot to slidably receive one of the bayonet pins of said base, said socket structure comprising an internal socket member axially slidably and non-rotatably mounted within said casing and resiliently biased toward said opening, said socket member having a bore to slidably receive the base of a small lamp, a lever pivoted on said casing and extending through a longitudinal slot in said socket member for latching engagement with said small lamp base, a second lever pivoted within said casing and having an arm formed with means for latching with a pin of said bayonet base, and a common manually operable release means for both levers.

2. In the device defined in claim 1, said release means comprising a second arm rigid with said second lever and adapted to engage said first lever and a manually operated button for said second arm externally accessible at a wall of said casing.

3. The device defined in claim 2, wherein said button is fixed on said second arm of said second lever.

4. In a photoflash device comprising a casing having a forwardly opening bore provided with at least one groove to slidably receive a bayonet lamp base pin, an annular internal socket member slidably and non-rotatably mounted within said casing, means resiliently biasing said socket member toward said opening, a small lamp latch lever pivoted within said casing and resiliently biased to extend through a side aperture of said socket member into latching engagement with the base of a small lamp inserted through said opening, a spring biased large lamp latch lever pivoted on said casing, said large lamp latch lever being a bell crank having one arm formed to latch with a pin of a bayonet base and another arm adapted to engage said small lamp latch lever, and manual means for rocking said large lamp latch lever to pivot both said one arm and said small lamp latch lever in lamp releasing direction.

5 The device defined in claim 4 wherein said manual means is a button on said other arm of the bell crank.

'6. The device defined in claim 4 wherein said one arm of the bell crank has an aperture adapted to receive said pin after the large lamp base has been inserted through the opening to shift said socket member rearwardly and pivot said small lamp latch member to inoperative position.

References Cited in the file of this patent UNITED STATES PATENTS 2,804,537 Greger Aug. 27, 1957 2,848,701 McKee et al. Aug. 19, 1958 2,920,301 Kawate Jan. 5, 1960

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2804537 *Dec 8, 1953Aug 27, 1957Voigtlaender AgPhotoflash lamp
US2848701 *May 18, 1956Aug 19, 1958Eastman Kodak CoLamp socket for photoflash units
US2920301 *Oct 11, 1957Jan 5, 1960Kenichi KawatePhotographic flash bulb socket
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3781759 *Aug 14, 1972Dec 25, 1973Gulton Ind IncFluorescent lamp receptacle
US4537453 *Jul 17, 1984Aug 27, 1985Olympus Optical Co., Ltd.Connecting mechanism of light source device for endoscope
U.S. Classification439/168
International ClassificationG03B15/04, G03B15/03
Cooperative ClassificationG03B15/0442
European ClassificationG03B15/04D