Please tell me what this ‘cog’ is called!

[tsbParticipant @tsb]

Sorry for this very vague description. I am trying to find out what this type of cog / sprocket / gear which has studs going around the circumference (not teeth but definitely studs) is called.

Does anyone know the correct name for this type of thing so I can find a supplier.

 

 

 

Edited By tsb on 29/10/2012 19:53:31

[tsbParticipant @tsb]

[Ian PParticipant @ianp]

If it was watch or clock size it would probably be called a 'Lantern' pinion.

Ian P

[tsbParticipant @tsb]

Thanks Ian P. but I'm thinking of something about 60mm diameter.

Like a studded dog collar to look at with one row of studs.

Any suggestions welcome…….please…….its doing my head in!

[JasonBModerator @jasonb]

Peg gear? the sort of thing you see on old windmills.

Edit having googled "Lantern Gear" that is what you want but suspect it will have to be made not bought

 

J

Edited By JasonB on 29/10/2012 20:35:11

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

Posted by tsb on 29/10/2012 19:52:49:

 

Does anyone know the correct name for this type of thing so I can find a supplier.

There is not production of readymade lantern gear, also you must fabricate a new lantern gear in work shop. And there is other word: Cage gear

Edited By Jens Eirik Skogstad on 29/10/2012 20:40:43

[magpieParticipant @magpie]

I think the type of cog you are talking about were used in early printers. I once dismantled lots of equipment from the local scrapyard and came across them quite often, allthough i seem to think most of them were about 30 to 40 mm dia.. Not seen any since then.

Cheers Derek

[tsbParticipant @tsb]

Thanks alot for all the suggestions, but we haven't find it yet. The studs are not protruding off the face but they are where the teeth would normally be

[tsbParticipant @tsb]

I've been busy with blu-tac and an empty ptfe tape spool to fashion a 3D example of what I'm failing to explain ! – Promise not to laugh as I won't make the 'Wallis and Gromit' claymation team !!

[NilochParticipant @niloch]

I was going to suggest one of those 'cogs' which pulled tractor paper through the old dot-matrix printers but you beat me to it with your image tsb.

[Sam StonesParticipant @samstones42903]

Hi,

I don’t have a name either, nor could I (at first) find/open your photo album (1 photo).

I’d guess from your description however, that it could be out of a camera or a cine projector, and that the teeth (pegs) match the film sprocket holes. There’s a wide variety of `wheels’ amongst this type of equipment. Alternatively, could it be for a chain drive of some sort?

Your photograph and model suggest some sort of film (or such like), transport mechanism.

Regards,

Sam

[KWILParticipant @kwil]

Definately looks like a tractor drive sprocket wheel for perforated paper drive.

[Michael GilliganParticipant @michaelgilligan61133]

Apart from the Printer "tractor drive" mentioned by Niloch … I have a French hand drill which uses this style of pinion, driven by a ring of round holes in the handwheel.

… Presumably much cheaper than the usual bevel gears, and it's multi-speed !

… I will post a photo when I have time.

But sorry; I still don't know what they are called.

MichaelG.

[BazyleParticipant @bazyle]

I would call it a 'pin-wheel' or 'sprocket' . If you look up printer paper it is listed as pin feed paper or sprocket feed paper. Tractor drive is slightly different and used on the older line printers which used a chain with pins to have more pins through the paper to avoid tearing it as they printed at such a rate (derived from crawler tractors).

[Chris TriceParticipant @christrice43267]

In movie camera terms, it would be called a sprocket.

[BazyleParticipant @bazyle]

And of course used in those old cameras that used plastic 'film' with 'sprocket holes'.

Ah, Chris just tbeat me to that.

Edited By Bazyle on 29/10/2012 23:09:48

[Ady1Participant @ady1]

I'd call it a sprocket or a pinwheel gear

"projector sprocket" gives good results

 

Edited By Ady1 on 30/10/2012 02:37:59

Edited By Ady1 on 30/10/2012 02:40:02

[SpringbokParticipant @springbok]

As I used to service the line printers that is for continuose paper we never ever had an official name for them just called them traction wheels. were bleeps if not correctly set. In the 60s had a projector to show kids movies and the sprocket wheel for driving the film through was sligtly different from what you depict. If and it is a BIG if find an old scrap line printer you will have 2 of these in it.

Q. What are you building that needs one of these!!!

Regards
Bob

[tsbParticipant @tsb]

Thanks for all the interest. I've found a youtube clip of the part in question and its intended use (but on a slightly smaller scale). The actual sprocket thing is shown in close-up at 2min 08secs

http://www.youtube.com/watch?v=h7RCOjv2Zmg

 

 

I know this has moved on a little from asking what cog / sprocket thing is called but any alternative thoughts on how to achieve the same action on a tight budget would be welcome.

 

 

Edited By tsb on 30/10/2012 10:47:54

Edited By tsb on 30/10/2012 10:48:51

[Jeff DaymanParticipant @jeffdayman43397]

I'd be looking in scrapyards for two rack and spur pinion sections (conventional spur gear type) from the carriage drive on a long bed lathe or similar, if not long enough, use two racks back to back.

Really crude but would probably work OK for a trailer push out as in the video is a length of roller chain welded to the bars at intervals, synchronised by two chain sprockets on a common shaft. Again these things can be found at scrapyards, but old chain and sprockets are often thrown away at motorcycle shops. If you went to a local motorcycle shop they may have some or will put some aside for you, maybe free, likely very low cost if any.

The ones in the video look to be homemade from a steel drum and some cone head rivets.

Good luck JD

[jason udallParticipant @jasonudall57142]

maybe syncro belt / pulley….

Have used chain as rack in barfeeds…… works well but mucky..

Belt would work dry…..

Sorry If I missed the application but what is it for? scale/mass/speed/ accuracy/ …all have impact on technolgy

[TerrydParticipant @terryd72465]

Hi Jason,

The application is in the YouTube video he linked to above, I tried to post it but it is too wide for this software.  Unusual, as I have posted videos before with no probs.

Regards

Terry

Edited By Terryd on 30/10/2012 17:16:33

[AndyfParticipant @andyf]

Judging by the shiny wear marks, they look basically to be rollers, taking the weight of the huge "drawer" they are rolling in and out. The studs must engage in holes to make sure neither end slips. That would make the "drawer" go askew and jam, as a wide drawer in an old chest might if you only pulled one of its handles.

If you propose a similar heavy-duty application, Allen bolts with their heads slightly tapered and screwed into round bar stock might do the trick.

Andy

[Les Jones 1Participant @lesjones1]

Hi tsb.
An alternative aproach would be to to use threaded rods passing throgh a nut fixed to the inner end of the box sections. The threaded rods could be driven via a shaft wth bevel gears or a series of toothed belts or chains.

Les.

[tsbParticipant @tsb]

Thanks for all the constructive advice. I've got to admit that it never crossed my mind that the offending part might have been 'homemade'. I just presumed it was a off-the-shelf part, so well spotted!

I might well try the allen bolt approach and see where to go from there.

[Author]

Posts