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Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
4 speed Crash Gearbox Illustration

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4 speed Crash Gearbox Illustration
David Stepney Offline
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Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#1
09-04-2023, 10:17 AM
Some little while ago, someone (was it Tony Griffiths?) posted an illustration from one of the motoring magazines of a beautifully detailed cutout drawing of the 4 speed crash gearbox, but I am damned if I can find it. Can anyone point me in the right direction to find it please?
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Reckless Rat Offline
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Car type: 1933 RP Standard Saloon
#2
09-04-2023, 10:28 AM
Two images here, David:

[Image: IMG-20230111-WA0005.jpg]

and the inside of mine :

[Image: IMG-20230111-WA0004.jpg]
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Archivist Offline
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#3
09-04-2023, 10:33 AM
And a more formal engineering drawing on the Archive web site...

https://archive.a7ca.org/collections/tec...em/TD0149/?
https://archive.a7ca.org/
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David Stepney Offline
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#4
09-04-2023, 10:41 AM
Thank you Bruce and Hugh, you are absolute stars!
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Hugh Barnes Offline
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#5
09-04-2023, 10:52 AM
Though I should point out that the Archivist has pointed you to the later, synchro box. The Archive does not hold a drawing of the crash box, sadly. He tells me he blames it on just having tested positive for Covid...
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David Stepney Offline
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Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#6
09-04-2023, 11:02 AM
I had noticed, Hugh. The Light Car and Cyclecar illustration tells me all that I was curious about. The third and fourth gearchanges are tighter than the first and second. I knew I ought to know the answer why, and that illustration has refreshed my memory: I am moving two sets of gears along two shafts.
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Chris KC Offline
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#7
09-04-2023, 02:16 PM
   

.jpg   DSC03014s.jpg (Size: 838.11 KB / Downloads: 330)
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Tony Griffiths Offline
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Location: Peak District, Derbyshire
Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
#8
09-04-2023, 03:24 PM
(09-04-2023, 10:17 AM)David Stepney Wrote: Some little while ago, someone (was it Tony Griffiths?) posted an illustration from one of the motoring magazines of a beautifully detailed cutout drawing of the 4 speed crash gearbox, but I am damned if I can find it. Can anyone point me in the right direction to find it please?

Yes, it was me. If you would like a high-resolution copy here it is: http://www.lathes.co.uk/austin7-2/img36.jpg
You can also sort through these 20 pages for more interesting illustrations: http://www.lathes.co.uk/austin7 with download instructions on the first page.
http://lathes.co.uk
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Terrytuned Offline
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#9
09-04-2023, 03:43 PM
Technically it's only crash 1st and second 3rd and top are dog gears as on most motorcycle gear boxes. Terry
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David Stepney Offline
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Car type: 1933 RP Standard Saloon
#10
09-04-2023, 07:08 PM
Thank you Tony. I have kept a copy to go with my Austin 7 file.

And Thank you Terry. I was aware. However, one can still make horrid noises with it if one gets it wrong.
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