US1744098A - Focus-adjustment mechanism for lamps - Google Patents

Description

Jan. 2l, 1930. F. L.. BAMFORD FOCUS ADJUSTMENT MECHANISM FOR LAMPS Filed Sept. 50, 1925 55s/wc mfofo @an KZ. Bam/afa? Patented Jan. 2l, 1930 UNITED STATES PATENT oFFIcE FRANK L. BAMFORD', OF DETROIT, MICHIGAN, ASSIGNOR TO C. M. HALL LAMP COM- PANY, OF DETROIT, MICHIGAN,

A CORPORATION OF MICHIGAN FOCUS-ADJUSTMENT MECHANISM FOR LAMPS Application filed September 30, 1925.

The invention relates to vehicle head lights of that type in which the illumination is alternatively supplied by a pair of filaments in the same bulb and off-set one from the other. Such constructions are designed to illuminate the road which is in the immediate foreground with the filament which is in the lower plane and greater distance with the filament in the higher plane, but to accomplish this each filament must be positioned with great accuracy with respect to the axis of the reflector. There must also be provision for adjusting the filaments axially of the reflector for proper focusing.

It is the object of the present invention to obtain a simple construction of adjusting mechanism for effecting both the focus and the lateral adjustment of the lamp.

Itis a further object to avoid any loose connection which might cause a rattling or vibration of the lamp when in instant service.

With these objects in view the invention consists in the construction as hereinafter set forth;

In the drawings;

Figure l is a central longitudinal section through a lamp to which my improvements are applied.

Figure 2 is a section on the line 2 2 of Figure l.

Figure 3 is a section on the line 3-3 of Figure 4:.

Figure 4 is a front elevation of the bushing as attached to the reflector.

Figure 5 is a perspective View of the bushinfr.

t is a lamp casing of any suitable form and B is the reflector mounted therein. C is the bulb which is provided with a pair of filaments D, D arranged in parallel planes respectively above and below the central axis. The lamp bulb is mounted in a socket member E which extends through a central aperture in the reflector and is provided with a rearwardly extending shank F. This shank is engaged by a screw G passing through a slot in the rear wall of the casing A with its head H outside of said casing. There is also a spring I arranged intermediate the casing and the rear end of the shank F which forces Serial No. 59,660.

the socket forward to the position permitted by the adjustment of the screw.

The construction as thus far described has been heretofore usld and provides for the adjustment of the bulb axially of the re"- flector for the purpose of focusing. It does not, however, accurately position the filaments with respect to the lateral distance from the central axis which function is performed by the following construction;

J is a bushing member arranged within the aperture in the reflector and slidably receiving the socket member E. This bushing is pivotally attached to the reflector preferably by providing the struck out lugs K, K on diametrically opposite sides thereof which engage recesses L, L in the reflector B and in the horizontal and axial plane thereof and a spring M in a sleeve upon the bushing its rear end engaging a flange N thereon and its forward end abutting against the rear face of the reflector. Thus the lugs K, K engaging the recesses L, L form rocker bearings or pivots for the bushing while the spring M holds these parts in engagement yieldably centering the bushing and preventing any rattle. To permit of assembling the parts, the reflector is apertured at O and O for the passage of the lugs K, K therethrough from the rear of the reflector, the spring M being compressed after which the bushing is revolved to a quarter revolution to engage said lugs with the recesses L and L.

The pivotal connection between the bushing and the reflector just described permits of rocking said bushing and the lamp socket contained therein so as to tilt the bulb downward or upward within the reflector. To permit of this movement the screw G which connects the shank F with the rear of the casing A is adjustable in the vertical slot F. I also preferably provide an adjusting mechanism which, as shown, comprises a sliding bar P lying adjacent to the rear wall of the casing and apertured for the passage of the screw G. This slide also forms the abutment for the rear end of the spring I so that by movement of the slide the screw, spring and shank F will be carried therewith thereby effecting rocking of the socket and lamp bulb. To

actuate the slide l? there is provided cam or eccentric Q which engages the bearing R, R on the slide and this: actuated l a rotary shank S lawine; a slotted head en the outside of the rear wall ot the canine', :raid shank haring?r a polygonal p v ortion to; en-

" *In H *11,11 4 1x11 l gaining: i 1c ea-n unie i 1 surionrctd iy a. spring S abutting` azgainst a collar U se b' a eotter nin U. This toi-nist: a iur-)le i i constructure to mauutzu'tizre and assemble carrying; with it the eci-er.' Ch ep? shank F. lt ia tlieret( ile to quickly and easilj adinet the secure the desired ligglitiir;r elfe-et when each filament illuminated.

That l claim an in Xv infe i is:

l. In a lamp.. the combination with a reflector, a lamp bulb and a ee-cliet ther:` paseing through an aperture in Said retlecf of a bushing tor s 'dab soelret pirotally engaging e, Silient means Sleeved on e engaging Said relleetor Said bueling trom nim and adjusting `ine-ane Yfor roel in;r to adinet Said lamp bul b tran respect to the` axis ot the retletor.

2. In a la p, the combinati Y with a re- Hector` and a lamp socliet exto* through an aperture thereinf et a lr n in which said socket slidahl;v .fe :feo 'i' through the aperture in sai provided with da]uetrically hearings in an axial operatingr recezfssed beai 5; resilient moana 'tor holding engagement with each oil il 'attlinevv` and means 'i'or reehingf; and bushing.

3. n a lamp the combinlector. oi a lamp Soil-:et exit an aprrture there?, i, meure, for lamp socket axially, a bueh fr in wh socket is elidably Secured `ileo paseine said aperture En the reflector@ u being provided with diauietriea, projecting luga 'wir rocl'zablj.7 cessed beaiunm` if' sleeved on Laid i which the oppeeiie end i el. ln a lamp, the effi' Hector, el' a litiup ffofgiet uur aperture therein, a buehingjy Socket is slid ably secured also passingr through the auerture in the retrector, Said bushing having a radially outwardly extending flange at its rear end an d beine; provided with struck out lues on diametrically opposite sides ihereoY` and at its4 forward eli-fl, said reflector be' j provided with Slots for the passage ot lugetherethrougrh and with recessed hearings Yter ei'igagring Said lugs when Said socket n en a partial revolution, and a Spring sleered on Said Seel-:et bearing at its rear end againet said flange and at its forward end afjfainst the rear tace of the reflector.

ln a lamp the combination with a reflec- 'or, et a lamp socket extendingr through an aperture iereiu and provided with a riarwardly eztenfliu Shank, ineaua ope able from outeide the cL` l) 'for adjusting Said Shank a ne o/liet ai ally of the reflector, a bushing in which said socket if; alidably secured exdingr through and pivotall).7 engaging the lace of the raid reflector;y means; for yieldably t .,inine t le pivotal e a en'ient ot Said huahing with Said reflector and meane operraid pivot.

6. ln a lamp, the coinlliuzition with a reflector, ol a lamp Socket passing through an aperture therein and provided with a rearwardly extendinev nl anl, a Screw for engrag ingy said Shank peering' through, an aperture in the rear Vall of the casing and provided witl'i on operating; head outside the casing, a bushing in which seid socket is slidably .Cieeured i'iivotally engaging: Said reflector, a Slide ,vithin said caeinp; engaging Said Screw and :neat e operable Yfrom out 'de the casing vtor adjuatinir Said Slide and through the medium ot aid Screw and Shank rocking Said Suchet a nd bushing.

7. In a lamp, the combination with a reflector., a lamp bulb and a Socket therelor pesaing throuejh an aperture in Said reflect 3r et a bushing for Slidably receiving Said eoelet pivotally entrairinej Said reliector, means for yieldably holding said bushing tree from movement on its pivote and for main- Viaininq the pivotal engagement of the bushinnV with the reflector ancL adjust-ing means ttor rocking Said bushingr to adjust l@aid lamp bulb transversely with respect to the axis of the reflector.

S. In a lamp, the combination with a reflector, of a lamp socket pivotally engaging said reflector, and provided with av rearwardly extending shank. mean@ paesing through a elet in the rear wa l ot the casingand engagsaid shank for ad iuatiner the same and d Socket axially, a slide inside Said casing jacent to the rear Vall thereot engaging :raid adjusting' meane, a cam member for actuatinl said slide to rock said socket on its pivot, and means operable from outside the casing for actuating said cam.

9. In a lamp, the combination with a re- Hector, of a lamp socket passing through an aperture therein and provided with a rearwardly extending shank, a bushing in which said socket is slidably secured pivotally engaging said reflector, a screw passing through a slot in the rear wall of the casing and engaging said shank to adjust the same axially of the refiector, a slide inside said casing adjacent to the rear wall thereof engaging said screw, a spring surrounding said screw bearing against said slide and said shank, a cam for engaging said slide to actuate the same, and a rotary shank for said cam passing through the rear Wall of the casing and operable to rock said bushing and socket.

10. In a lamp, the combination with a housing and a reflector therein, of a lamp socket rockably mounted within said housing, a slide for rocking said socket, a cam for actuating said slide and a shank for actuating said cam, said shank having a slotted head outside said housing, a polygonal portion within said housing engaging said cam, a spring sleeved on said polygonal portion for exerting a resilient presure on said cam to prevent rattling of the same, a collar on said shank forming abutment for said spring and a cotter pin for retaining said collar on the shank.

11. In a lamp, the combination with a casing, of a reflector within the casing, the said reflector being provided with an aperture, a lamp socket., means for pivotally and slidably mounting the lamp socket in the aper ture in the reflector, a shank extending rearwardly from the lamp socket, means passing through a slot in the rear wall of the casing and engaging said shank for adjusting the socket axially, resilient means for urging the said shank and socket forwardly, and a slide within the casing and engaging the said adjusting means for rocking the said adjusting means, shank, and lamp socket.

In testimony whereof I aiiix my signature.

FRANK L. BAMFORD.

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