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IndigoBlueCooperS
 Post subject: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 1:42 pm 
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Looking at modifying some standard front seats as per that done for the police cars.
This is to suit a low roof line (about 3 inches) not for a tall stature with cap on.

Was the only mod the removal of 1" from the rear supports?
Was it 1", or more or less?
Were there any modes to the front of the seats / brackets or was this left standard.

Thanks to viperrwk for the photo.
Seat on the right has the lowered rear support or legs.
Seat on the left has been shortened and then extended.


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gtogreen1969
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 2:36 pm 
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Does this help?

Attachment:
Police Cooper S lowered Seats.jpg


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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 2:48 pm 
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For pre-1971 seats that don't have the mechanism to anchor the rear of the seat to the floor the only modification was the removal of about 1.5" from the tube, bending the tube so the two ends meet and welding the two ends together. No change was made to the mounting bracket.

This is part of engineering drawing HYA7267 for the modification to create a Special Production Order 16 lowered seat. The measurement for the length to be removed is indistinct but I've calculated it to be approx. 1.5" by comparing two seats. Shown in the drawing is the approx position where the tube is to be reformed by bending.

Ignore the other diagrams and comments as they relate to the later ADR compliant seat frames.

Attachment:
HYA7267 Rework Front Seat Frame Assembly SPO16 subset wm.jpg


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gtogreen1969
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 3:10 pm 
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winabbey wrote:
For pre-1971 seats that don't have the mechanism to anchor the rear of the seat to the floor the only modification was the removal of about 1.5" from the tube, bending the tube so the two ends meet and gas welding the two ends together. No change was made to the mounting bracket.

This is part of engineering drawing HYA7267 for the modification to create a Special Production Order 16 lowered seat. The measurement for the length to be removed is indistinct but I've calculated it to be approx. 1.5" by comparing two seats. Shown in the drawing is the approx position where the tube is to be reformed by bending.

Ignore the other diagrams and comments as they relate to the later ADR compliant seat frames.

Attachment:
HYA7267 Rework Front Seat Frame Assembly SPO16 subset wm.jpg


Nice one Doug.
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IndigoBlueCooperS
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 3:39 pm 
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Excellent info guys.
Now all I need to do is find a pair of seats to modify.
Thanks again.
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eightfifty
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 7:23 pm 
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Last edited by eightfifty on Thu Sep 29, 2022 12:31 pm, edited 1 time in total.

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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 8:07 pm 
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eightfifty wrote:
Doug is showing his computer science background here. The tube has to be mig welded together, not gas welded.

Ha ha, no, I'm showing my reading skills. :) The BMC drawing says to gas weld (I assume that's what "CO2 weld" means)?. I'm not a welder so I wouldn't know which is best today. Did they have MIG back in the mid-sixties?

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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 8:10 pm 
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Also, the rework was done on the bare frame so no issue with adjoining trim being affected. Would all the trim have to be removed if making this mod on a complete seat?

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eightfifty
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 8:17 pm 
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Last edited by eightfifty on Thu Sep 29, 2022 12:31 pm, edited 1 time in total.

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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 8:53 pm 
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This is in a corner of the drawing.

Attachment:
HYA7267 Rework Front Seat Frame Assembly SPO16 welding subset.jpg


The BMC Standard YMP215 for welding covers 59 pages so it's quite extensive as you'd imaging for a manufacturer primarily welding sheet metal together, adding a powerplant and putting it in the hands of the general public.

Here's the intro page to YMP215.

Attachment:
Page D_W1_1 Welding Standard YMP215.jpg


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eightfifty
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 9:40 pm 
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Last edited by eightfifty on Thu Sep 29, 2022 12:30 pm, edited 1 time in total.

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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 9:49 pm 
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I have removed the word gas from my initial post.

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eightfifty
 Post subject: Re: Police Spec Seat Mod
PostPosted: Wed Apr 01, 2020 9:55 pm 
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Last edited by eightfifty on Thu Sep 29, 2022 12:30 pm, edited 1 time in total.

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eightfifty
 Post subject: Re: Police Spec Seat Mod
PostPosted: Thu Apr 02, 2020 7:12 am 
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Last edited by eightfifty on Thu Sep 29, 2022 12:29 pm, edited 1 time in total.

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winabbey
 Post subject: Re: Police Spec Seat Mod
PostPosted: Thu Apr 02, 2020 7:53 am 
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The information provided in this post is purely as an historical reference to what was done by BMC back in the day. It should not be seen as an endorsement, recommendation or any other guidance in modifying a seat or any other vehicle component today.

Richard - I don't consider Tony a "know it all" but he certainly knows a lot about the subject matter and much of what we discuss on this forum. I respect his opinion and believe his comments are in good faith.

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