Pivot Shoe Identification & Coil Balance

Question

pat.5,353,548

i have these constant force balances throughout my house. many of them snap up when you take sash out for cleaning. i measured the square footage of the bottom sash. i have ten windows, and i came up with 3 weights.

6 bottom sash weigh 21.4 lbs.

2 sash weigh 18.2 lbs.

2 sash weigh 15 lbs.

There are 10 bottom sash and 10 upper sash. so i assume i purchase 12 constant force balances 11 lbs, 4 cfbs of 10 lbs, and 4 cfbs of 8 lbs. i wonder if you could look this over and tell me what i need to order. i also would like to know if it is better to use jamb spreaders or the cutout method.

ps i realize that this is only enough to do 1/2 the job ,but would like to get my feet wet on the bottom sash before i attempt repair on the tops.

the pivot shoes are approximately 1 1/4" and 5/8" thick

Bob · Accepted Answer

Thanks for posting. Your pivot shoe looks like our 15-086 Coil Housing Pivot. Also see our 15-086 Tandem Coil Housing. This system works with our Series 180 Coil Balances. Our Series 180 Coil Springs go up to 9 lbs of weight, so you will need to stack multiple springs on each side of the sash. Are there stamps on your coil springs? If not, see below.

For the sashes that weigh 21.4 lbs, you will want on both sides of the sash (2) S180-8 and (2) S180-3. This equals 11 lbs of support on either side of the sash, for a total of 22 lbs of support (rounding up from 21.4 should be OK).

For the sashes that weigh 18.2 lbs, you will want on both sides of the sash (1) S180-9. This equals 9 lbs of support on either side of the sash, for a total of 18 lbs of support (rounding down from 18.2 to 18 lbs should be OK).

For the sashes that weigh 15 lbs, opt for (1) S180-3 and (1) S180-4 on both sides of the sash, for 7 lbs of support on either side of the support and a total of 14 lbs of support (1 lb less should be OK).

Let us know if you have any other questions.