CMP windshield throwout arm assemblies

[Jacques Reed]

Originally Posted by Mike Cecil

Grant,

I think you will find that the long arms (without notch) were originally introduced on Australian GMH production CMPs to allow the w/screen to open to 90 degrees, or be closed shut. I believe the intention was either fully open or fully shut, so leaving the w/screen locked at an angle just by the friction/tightness of the locking wheels was not intended. There were footman loops on the leading edge of the roof to secure the canvas w/screen covers for when the w/screen was in the fully open position, to prevent reflection.

There were also activating arms on the centre pylon to aid in getting the w/screen to 90 degrees but these are not visible in your images, so perhaps these did not make it into CDN production? The levers were also an Australian invention.

Hopefully, some Aussie CMP owner will have an image of this to post?

Mike

Like these Mike.

Cheers,

[Mike Cecil]

Thank you, Jacques, that's the image I was hoping for.

The scissor-type action is clearly seen in your image. This allowed the windscreen to be opened to 90 degrees (ie to the horizontal) from the seated position. Apparently not a modification that made it into CDN production.

Mike

[Grant Bowker]

Those (Australian) arms are definitely not something I've seen in Canada...

[Jordan Baker]

The Australian arms seem to be similar to the windshield arms used in the C15ta

[Charlie Down]

I've been playing around with the images and drawings.
My initial conclusions are that the 1533X2 had the shorter arms, which is sort of confirmed when I overlaid the images after sizing them.
It looks like the CMP arms were a bit heavier duty than the MCP 1533X2 arms, but seem to have very similar profiles.
Whether the MCP arms were made from thicker gauge metal is hard to see or measure with poor quality 80 year old photographs.

[Charlie Down]

Here's my initial drawing of the front view of the windscreen and components, without wipers as on operations. Some details still to be added.
Need more information /dimensions and photos of wiper motor, wiper motor mounting brackets, and wipers to do rear and side view of windscreen.

Spent a lot of time getting the side arm curves right. The 1533X2 arms look to be finer than the 'later' CMP arms.

Any information and feedback welcome.

[Jacques Reed]

Originally Posted by Charlie Down

Here's my initial drawing of the front view of the windscreen and components, without wipers as on operations. Some details still to be added.
Need more information /dimensions and photos of wiper motor, wiper motor mounting brackets, and wipers to do rear and side view of windscreen.

Spent a lot of time getting the side arm curves right. The 1533X2 arms look to be finer than the 'later' CMP arms.

Any information and feedback welcome.

Hi Charlie,

Not sure if this is what you need. These are vacuum wipers and mounting bracket to the windscreen bracket. From a Ford CMP but maybe common. If they are what you need I can get you the dimensions.
Note: Small lever on windscreen side to allow manual operation of the wiper just visible in top view.

Revisiting your photos I think yours are completely different make/type. Anyway, I will leave this post up for interest sake. Sorry I could not help.

Cheers,

[Marc Montgomery]

I seem to recall my former 1944 Chev CMP windows would open to 90 degrees but arms definitely did not reach up to touch cab roof wnen closed.
Can't remember if there was a half way stop...might have been, but memories...sigh.


Ps in retrospect, I'm pretty sure there were half way stops on the arms.