Lift assist for the new Mark 7

[doug45601]

And here it is folks!

http://www.colonialmedical.com/product. ... ctid=17266

[dusty]

And here it is folks!

http://www.colonialmedical.com/product.php?productid=17266

Thanks BUT NO THANKS. I went through that routine when I was having problems with my knees. I prefer to believe that is all behind me.

[JPG]

Are you saying that you need to know the length of the gas tube in those two positions?

The gas tube is about 17" long. Fully extended, it cannot be more than 34". The bench tubes are about about 48" (exposed). The fixed point where the gas tube attaches is about 17" from the right end of the Mark V legs.

In other words, if you mounted two lift assists on the same set of bench tubes, the gas tube mounting points would be about 14" apart.

Added Comment: In the advertisement photo of the Mark 7 Lift Assist, it appears that the gas tube is not located between the bench tubes like it is on mine. Maybe some redesign has occurred, other than increasing the capacity of the gas cylinder.

Dimensions needed(from an existing Mark 5/V) lift assist needed are:


1) Hinge pin(pivot) to bottom end of gas tube attachment point(on the bracket attached to the bench tubes). Does not vary when raised to vertical.

2) Hinge pin(pivot) to other end of gas tube attachment point(on the arm attached to the way tubes. Does not vary when raised to vertical.

Those distances are fixed regardless of what rotational position the headstock and way tubes are in, but the separation of the attachment points increases as it is raised to vertical. As you have provided, that increase cannot be more than something less than 17".

Perhaps one reason we be on, different pages, is that I perceive(wishful thinking?) the same hardware on the same end functioning as an assist(albeit through differing motion) for lifting using a pivot(Mark 7) on the opposite end of the tubes.

I had noticed the apparent positioning of the gas tube external to the bench tubes in the distant past and have always been concerned that what I thought should be between the bench tubes was somehow actually outside of them. Me thinks a bit of photo shop wizardry gone awry?

[dusty]

Dimensions needed(from an existing Mark 5/V) lift assist needed are:


1) Hinge pin(pivot) to bottom end of gas tube attachment point(on the bracket attached to the bench tubes). Does not vary when raised to vertical. Approx. 9 1/2"

2) Hinge pin(pivot) to other end of gas tube attachment point(on the arm attached to the way tubes. Does not vary when raised to vertical. Approx. 18"

Those distances are fixed regardless of what rotational position the headstock and way tubes are in, but the separation of the attachment points increases as it is raised to vertical. As you have provided, that increase cannot be more than something less than 17".

Perhaps one reason we be on, different pages, is that I perceive(wishful thinking?) the same hardware on the same end functioning as an assist(albeit through differing motion) for lifting using a pivot(Mark 7) on the opposite end of the tubes.

I had noticed the apparent positioning of the gas tube external to the bench tubes in the distant past and have always been concerned that what I thought should be between the bench tubes was somehow actually outside of them. Me thinks a bit of photo shop wizardry gone awry?

Measurements in blue.

[JPG]

Measurements in blue.

Input received! Thank You!! Stay tuned(may be a while though).

[JPG]

Input received! Thank You!! Stay tuned(may be a while though).

As a 'double check' to my 'plotting', what is the gas tube attachment points separation when horizontal and vertical (~ 18"(down), ~18"+extension(up)) TNX

I am assuming the bench tube gas tube attachment point is 2-3" out from the pivot.


OK I made an incorrect 'assumption'. The dimension between the attachment of the gas tube on the arm and the pivot will change between up and down position.

What is the pivot to gas tube attachment point on the arm dimension when raised to vertical? SAT!!!

[dusty]

As a 'double check' to my 'plotting', what is the gas tube attachment points separation when horizontal and vertical (~ 18"(down), ~18"+extension(up)) TNX

I am assuming the bench tube gas tube attachment point is 2-3" out from the pivot.

I do not understand what you are asking for.

[JPG]

I do not understand what you are asking for.

See edited post. If still nebulous pls get back!

[JPG]

In fairness to Dusty who seems to be bending over backward to feed me the dimensions I 'think' I need I shall attempt to sketch a pix of the dimensions needed and include some from my Goldie.

In an attempt to 'keep it simple' I overlooked the actual motion of the end of the gas tube attached to the 'arm'(it does not simply rotate at a constant distance from the pivot). [It does so if tilted the 'other' direction]

i.e. TIME OUT!:o

[dusty]

As a 'double check' to my 'plotting', what is the gas tube attachment points separation when horizontal and vertical (~ 18"(down), ~18"+extension(up)) TNX

I am assuming the bench tube gas tube attachment point is 2-3" out from the pivot.


OK I made an incorrect 'assumption'. The dimension between the attachment of the gas tube on the arm and the pivot will change between up and down position.

What is the pivot to gas tube attachment point on the arm dimension when raised to vertical? SAT!!!

I'm still not sure I know what you are seeking. Hopefully this will help.

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