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Early 50s Sturmey-Archer Headlight: An Anatomical Tour

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Early 50s Sturmey-Archer Headlight: An Anatomical Tour

Old 05-10-12, 07:00 PM
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Roll-Monroe-Co
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Early 50s Sturmey-Archer Headlight: An Anatomical Tour

This and other parts I harvested from a crashed 1950-ish Robin Hood (original thread https://www.bikeforums.net/showthread...inal-equipment). I took it apart to clean it up and was amazed at the complexity of the interior and the number of parts involved. Here it is.





I thought the switch was a piece of rusty metal. Instead, it turned out to be this composite circuit-board stuff.



I like how a hollow on the back of the switch catches the contact, like an indexed shifter.



The hollow shell.


That thing is not a screw. Why does it have a slot like one?



Undercarriage


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Old 05-10-12, 07:00 PM
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It's important to have a VERY WELL-DEFINED part number.



A tiny cotter pin! WHY? Because indestructible, that's why.



Meguir's brought some life to the paint, let me tell you.



Oh, yeah!



Most of the yucky on the chrome is coming off with Mother's. I found out the hard way that the tarnishing on the reflector inside was just dirt. Mother's removed some of the very thin plating.



Rubber O-ring sealing the lens was still supple.



Eventually I'll re-wire it, finish cleaning up the plating, wax it all down and re-assemble. It's destined for my DL-1, I think.

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Old 05-10-12, 07:48 PM
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Red tag should go to the center terminal. Not to the black as was fastened.
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Old 05-10-12, 08:08 PM
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Wow, that is pretty complicated, isn't it? It is neat to see these old pieces and how well made they were. Today's stuff just doesn't hold a candle to the way things were built in the early 50s. The longevity of these parts is a testament to the quality they put into their products.
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Old 05-10-12, 08:10 PM
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Nice! Thanks for posting the photos.
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Old 05-10-12, 08:24 PM
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the reflector is normally silver plated, chrome is darker
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Old 05-10-12, 08:28 PM
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This anatomy stuff never set well with me...
I had to go out and have a smoke so I wouldn't get sick when it came time to dissect a frog in my HS Biology lab.
- I feel a little queasy now - but thanks anyway, Roll-Monroe: It's the thought that counts.
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Old 05-10-12, 09:53 PM
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Brilliant, thanks! I'm only familiar with the 70s (and maybe 60s?) chromed bullet SA lamps that equipped the mass marketed Superbes that inundated the shores of North America. They are of a much simpler and less robust design.
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Old 05-11-12, 06:32 AM
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My '49 Sports has an identical light, which wasn't working when I got it. Turns out that the wire to the back of the bulb holder had pretty much disintegrated. I soldered a short length of cable to the bulb holder, crimped a ring terminal on the other end, now it's good for another 60 years.
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Old 05-11-12, 06:39 AM
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Wow, cool. I haven't seen one like this before, and don't understand how it works. Did you give us a pic of the switch, from the outside of the hub? is that what the slotted non-screw thing is?

I recently worked on a Lucas King of the Road light of approx the same vintage; it is similar (similar silvered reflector, O-ring, etc) but mine has a two bulbs (one centered, the other higher up), and a switch on top which has three positions (presumably off/normal/high beam) but I couldn't figure out how it all works. I put a powerful LED in it that runs off the GH12 hub that Auchencrow gave me, and I tried to set it up so the switch selects between headlight alone and headlight-taillight combo. But I got too confused, and settled for just the headlight option. For now.
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Old 05-11-12, 11:02 AM
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The three position switch isn't for high/low/off; it is for dyno/off/battery if using a dry battery unit. The extra switch position isn't used with Dry Accumulator or Filter Switch Units or if running a dynamo only. Internals look exactly the same as my HF-62 unit from 1946 and much like Norm's required the wire to the bulb holder to be re-soldered.
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Old 05-11-12, 11:15 AM
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Wow, this makes me want to open up my 1954 Superbe's head lamp. It's just like being a kid and wanting to see how the toaster works. BTW, does one of you have an extra tail light kicking around? Mine is smashed.
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Old 05-11-12, 12:04 PM
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Originally Posted by Fenway View Post
The three position switch isn't for high/low/off; it is for dyno/off/battery if using a dry battery unit. The extra switch position isn't used with Dry Accumulator or Filter Switch Units or if running a dynamo only. Internals look exactly the same as my HF-62 unit from 1946 and much like Norm's required the wire to the bulb holder to be re-soldered.
Thanks, Fenway. I was personally baffled by the three-position switch. I must have stuck mine back together incorrectly after taking it all the way apart, figuring I had to rewire it anyway.
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Old 05-11-12, 12:05 PM
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Originally Posted by BluesDaddy View Post
Wow, this makes me want to open up my 1954 Superbe's head lamp. It's just like being a kid and wanting to see how the toaster works. BTW, does one of you have an extra tail light kicking around? Mine is smashed.
I was going to ask you the same question!
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Old 05-11-12, 01:38 PM
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One on Ebay now...
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Old 05-11-12, 01:53 PM
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Originally Posted by Roll-Monroe-Co View Post
It's important to have a VERY WELL-DEFINED part number.



That is a patent number. It's a brit patent, some information is available here:
https://worldwide.espacenet.com/publi...205A&KC=A&ND=4
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Old 05-11-12, 02:14 PM
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From that link, very interesting.


PATENT SPECIFICATION

Application Date: Aug 21, 1939 No 24092/39.

Complete Specification Accepted: Jan 20, 1941.

COMPLETE SPECIFICATION

532205 Improvements in Vehicle Lamps We, STURJELY-ARCHER GEARS, Li Mrr ED, a British Company, of Lenton, Nottinghain, in the County of Nottingham and WILLI Am Bpowx-, a British Subject, of the Company's address, do hereby declare the nature of this invention and in what mauner the same is to be performed, to, he particularly described and ascertained in and by the following statement:-

This invention relates to vehicle lamps o.f the kind which comprises, a lamp body having a glass front attached by a ring or bezel, said body containing a reflector, a holder for an electric light bulb and means, operable from the exterior of said body, whereby said bulb holder may be adjusted along the axis of said reflector for focussing purposes.

The object of the present invention is to provide an improved construction haaving certain advantages to which attention will he drawn later.

A vehicle lamp constructed in accordlance with the present invention comprises a body, a glass front attached to the body by a ring, a reflector and a bulb holder ini the body, means within the body but operable from the exterior thereof for adjusting the bulb holder along the axis a O ot' the body, a releasable coupling Petween the adjustment means and the bulb holder, the reflector, glass and ring formin a Uniit detachable from the body \.-ithiotut affecting the bulb holder or the adjustment means.

The reflector, glass front and attacliinent ring may be permanently secured together, with the joints between their abutting faces sealed against entry of moisture.

The rear end of the reflector may be formed or provided with a tubular guide in which the bulb holder is slidably mnointed, the bulb being small enough to pass through said guide.

T The adjusting means for the bulb holder preferably comprises a screw -andnult mechanism, carried by the lamp body and serving to support the bullb holder us-hen the reflector is removed.

In order that our invention mav be learly understood and more readily carried into practice, we have appended lPrice 11-l hereunto drawings illustrating the same,, wherein: 55 Figure 1 is a sectional view in plan showing our invention applied to a cycle lamp.

Figure 2 is a sectional view in side elevation 60 Figure 3 is a perspective view showing three of the parts of the mechanism.

In the construction illustrated, the lamp comprises a body 10 of the usual streamline form At the front this body 65 is flanged as shown at 11, and detachably enxgaged with the flange is an attachment ring 1 '2 carrying a glass 13 and a parao 11 ic reflector 14 At its rear end the reflector 14 is formed with a tubular 70 guide 15 This tubular guide may, however, bie made separately from the reflector and carried thereby.

The attachment ring 12, front Glass 13, and refector 14 are, permanently attached 75 together to form a single unit, the joints between the glass 13 and the edges of the riit, 1 and reflector 14 being sealed against entry of moisture, so, that tarnishijlg of the reflector is prevented 80 Slidaly mounted in the guide 15 is a bulb) holder 16 carrying an electric light n 117, whose dimensions are such as to perimit of its being passed through the uride 15 85 At its rear end the bulb holder 16 is provided with a flange 18 which has slots 19 at opposite sides and which need not be coitinuous around the periphery of the bulb holder; for example, the latter could 90 eqaally Cveil be made with two oppositely disposed lugs having the slots 19 therein.

At the rear end of the body 10 is an adjusting screw 20 having a stepped shoulder 21 which engages in an opening 95 formied in the body wall The screw is further provided with a knurled head 22 adapted to be operated by hand from the exterior of the body.

The threaded part of the screw 23, 100 which is coaxial with the reflector 14 when the latter is in position, engages a tapped hole in a bracket 24 having a pair of arms 25.

Placed on the stem of the screw 20 is a l O washer 26, a lock nut 27 and a spring c; Ad 532,205 washer 28, the spring washer providing a frictional resistance to turning movements of the screw, so as to ensure that it w-ill retain any position into which it is S moved, oven w-hen subject to vibration.

The screw is prevented, lby means of a split cotter 29 passed therethrough from becoming entirely released from the bracket 24.

The bracket 24 is prevented from turning with the screw 20 by reason of the fact that the lower edges of the arms 25 are engaged b)y the shoulders 30 of a plate 31 riveted at 32 to the interior of the lamp body 10.

Between the shoulders 30 is a projection 36, the edges of which engage the inner surfaces of the bracket arms 25.

The ends of these arms 25 are formed w-ith neck portions 33 of reduced width and at opposite ends of each neck portion are shoulders 34 and 35.

The bracket arms 25 are resilient so that the neck portions 33 can be sprang into the slots 19 of the bulb holder 16, and when in such position the shoulders 34 and 35 engage opposite sides of the flange 18.

Rotation of the screw 2) in either direction causes the bracket 24 to be moved axially thereof and the shoulders 34 or 35 on the bracket arms 25 transmit this movement to the bulb holder 16 so that the position of the bulb 17 along the axis of the reflector 14 can thus be adjusted.

The whole of the adjusting means, with the exception of the head 22 of the screw 20, is contained within the lamp body 10 and is thereby protected against corrosion.

Should it become necessary to replace the bulb 17, this can be effected without disturbing the seal at the periphery of the front glass 13, which, as already mentioned, is assembled as a unit with its attachment ring 12 and the reflector 14.

Owfing, to the nature of the releasable coupling between the bracket 24 and the bulb holder 16, removal of the unit aforesaid does not affect the position of the bulb holder relatively to the lamp body 10, as at remains supported by the adjusting means within the latter.

The tubular guide 15 on the reflector 1-4,an be re-engaged with the bulb holder 16 without difficulty when the front unit is replaced, and thereafter the guide 15 accurately centralizes the bulb holder 16 with reference to the axis of the reflector 14.

Instead of the resilient arms 25 of the 1.racket 24 being formed with reduced neeks 33 which engage slots in a flange on the biulb holder 16, the latter may be provided with oppositely arranged idially pio'jetingl pins adapted to eater holes in the bracixet arms 2)5 when such arias are sprung over them In such a-u arran-ement, in order to prevent the bulb 70 holder 16 from pivotin on the axis of the pils when the reflector 14 is removed, he pins may be of nion-circular section.

We are aware that, in connection with Jamps of the kind to which the present 75 invention relates, it has already been priowoed to mount the bulb holder slidiably in a tub ular guide on the ieflectoi und to support it through the medium of the afljusting means whilst the reflec 80 tor is removed In these prior conAtructions, however, the adjusting means is permanently connected to the bulb holder, and the glass front and its attachiient ring do not form a unit with the 85 reflector which latter cannot be removed so long as the bulb is in its holder.

Having now particularly described and csieertained the nature of our said invention and in what mnanner the same is to 90 1, performed, we declare that what we
1950s lamp housing patent
Inventor: WILLIAM BROWN Date of filing Complete Specification: May 9, 1955.

Application Date: July 10, 1954.

Complete Specification Published: Nov 28, 1956.

index at acceptance:-Class 75 ( 4), C 8 C.

COMPLETE SPECIFICATION

An Improved Lamp.

We, STURMEY-ARCHER GEARS LIMITED, a British Company, of Lenton Boulevard, Nottingham, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-

This invention relates to lamps, of the type generally used upon vehicles such as cars, cycles and the like, including a lamp body and a removable rim.

An object of the invention is to provide a simple lamp construction in which the rim may be secured to the lamp body or l 1 removed therefrom without the use of tools, and in which no means, external of the lamp, are necessary for securing the rim in position.

According to the present invention a vehicle lamp comprises a lamp body having a forwardly projecting flange of reduced diameter, and a removable beaded rim adapted to fit onto said flange, in which an outwardly projecting lip capable of locating a part of said rim beading is provided on said flange, and a detent member capable of engaging behind said flange is provided on said rim, whereby the rim may be secured to the lamp body by locating the rim on the body with the detent member within the flange in the region of the lip and subsequently rotating the rim until the detent lies approximately diametrically opposite to the lip.

Preferably the detent is in the -form of a hooked spring member adapted to fit partly behind the rim beading and having an outwardly projecting hook adapted to be inserted behind the lip of the flange.

In a preferred form of lamp there is provided a stop which is located diametrically opposite the lip of the flange, whereby rotation of the rim is arrested when the detent abuts the stop and thus a correct position of the rim in relation to the lamp body is 762,422 No 20239154.

ensured The stop may, of course, be formed in any desired manner, for example an inwardly projecting lug having any suitable shape would provide the desired stop.

The invention will be described further,50 by way of example, with reference to one practical form thereof illustrated in the drawings accompanying the Provisional Specification, in which:-

Fig I is a sectional elevation of lamp 55 body and rim which are shown spaced for clarity and showing the detent in position; Fig 2 is a front elevation of the lamp body shown in Fig 1; Fig 3 is a perspective detail of the detent 60 shown in Fig 1; Fig 4 is a fragmentary detail showing the method of securing the detent over the lip region of the flange; and Fig 5 is a sectional elevation, similar to 65 Fig 1 in which the lamp is shown with the rim in the assembled position.

In the drawings a vehicle lamp consists of two parts, namely a body part 10 of known outline, and a rim 11 also of known 70 outline and adapted to hold a glass or perspex sheet.

The body 10 has, formed at its open end, a forwardly projecting flange 12 of reduced diameter, one part of which is turned over 75 to form an outwardly projecting lip 13, the lip 13 being in such a position that it will be in the lower region of the lamp when such latter is in position on a vehicle.

Diametrically opposite the lip 13 is a stop 80 14 of any desired shape, the one illustrated being substantially triangular, which is positioned so that the rim 11 can only be rotated, a predetermined distance, as will later be described 85 A hooked clip, or detent, illustrated generally by the numeral 15, consists of a length of spring wire shaped to form a substantially T-shape The stem 16 of the T is doubled and has each of its arms 18 bent approxi-90 762,422 mately at their mid-points, so that the ends of locating a part of said rim beading is 19 are directed towards a hook 17, formed provided on said flange, and a detent memby bending the ends of the stem 16 ber capable of engaging behind said flange This clip 15 is adapted to fit, with its arms is provided on said rim, whereby the rim 518 and ends 19 behind a beading 20 formed may be secured to the lamp body by locating 35 on the rim 11 so that the hook-end 17 lies the rim on the body with the detent member over and-pro-cts outwardly from the bead within the flange in the region of the lip ing 20 and subsequently rotating the rim until the use, to ii, the rim 11 to the body 10 detent lies approximately diametrically oppofor instance r having replaced a bulb in site to the lip 40 -

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Old 06-30-15, 09:13 PM
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Raising an old thread from the files.

Have an identical light. The angled metal part that bolts from the top bolt on stem to the bottom of the lamp broke. Would anyone have this part available? This is on a 1951 Rudge Sports.

Local metal fab shop will make part for $30, which is minimum shop charge.
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