36 replies to this topic

[Zage]

I think the "T" grip is the most used grip now a days. The "T" grip is one of the most simplest design(next to the TB-41) and is easy to understand. It is a single position grip.

Here is what it looks like.
 grip1.jpg (13.98K)
Number of downloads: 48




Here is what it looks like disassembled.
 grip2.jpg (16.11K)
Number of downloads: 39




Leitner used this style of grip as did Agamatic, Garaventa, Doppelmayr, and Poma (used in the picture) The normal torsion spring DT grips on Doppelmayr and Doppelmar-CTEC lifts looks like the "T" grip a litle bit, but since they have torsion springs, they are double position. Doppelmayr does use a single position "T" grip on some lifts.

Of course, two of the grips can be fused together to make a double grip.
 grip3.jpg (35.74K)
Number of downloads: 47

[edmontonguy]

Does the double grip have a flexible grip needle spanning the cable inbetween the two grips? I'm assuming it does because the span of the grip is quite large and would probably have troubles on some sheave assemblies if it didn't have this feature.

[highspeedquad]

It does have a grip needle spanning the two grips when there is a double. I would think that it would make it a little smoother when riding on the compression or depression sheaves because you can't bounce in the space between the two sheaves, unless there is a big gap.

[floridaskier]

The double grip on older Poma lifts (is this one called the TB?) feels just the same as the single one on depression towers

[highspeedquad]

The older one is named the TB-41. I don't know how it would feel, being that I've never really ridden on a Poma gondola. However I have ridden a double grip. Don't remember much, though. Just a guess.

[floridaskier]

I've ridden the single and double TB grips in the same day, and really, it doesn't feel too different

[highspeedquad]

Are there any lifts in North America with the double Omega-T grip? Does anyone have any pics?

[Duck]

Zage, can you explain:

"but since they have torsion springs, they are double position."

I'm not quite sure what you mean. Are you refering to Doppelmayr's bistable mechanism (where the grip has two resting states, rest open and rest closed, unlike the grip you show, which is always default-clamp?)

-Iain

[highspeedquad]

Yes, those are the double-position grips, also known as torsion bar.

[Zage]

[quote name='Duck' date='Mar 14 2005, 08:04 PM']
I'm not quite sure what you mean. Are you refering to Doppelmayr's bistable mechanism (where the grip has two resting states, rest open and rest closed, unlike the grip you show, which is always default-clamp?)


That is exactly what I am talking about. See single position grips open then close in the terminal. Double position grips open and stay open in the terminal.

[highspeedquad]

All Poma grips are and have been single position, using some type of spring system. Dopp has both types. I think that the customer decides which grip they use for Dopp, for some reason I see more torsion bar than T-grip.

This post has been edited by highspeedquad: 14 March 2005 - 08:31 PM

[Duck]

But a torsion bar is a "torque spring" - a tube-like device with one end fixed and the other end able to rotate, with an increasing resistance the further you twist. How does that relate to Doppelmayr's 2-position grip?

-Iain

[floridaskier]

That's where the grip force comes from

[Duck]

I agree. But a torsion spring isn't a bistable mechanism. :) It's a spring used to generate a twisting force.

-Iain

[liftmech]

Right. Doppelmayr uses a double-position grip, and generates grip force with either torsion bars or belleville washers. It would be just as easy for a torsion-bar grip to be single-position, though. The newer Doppelmayr grip looks to be single-position, similar in design if not in construction to the Omega T.

Zage, when you refer to the T grip you're talking about Poma's latest Omega grip, which is found in the T or TL models. Other manufacturers call their grips by different names; even though they may look like the Omega T they aren't called a T.

[Zage]

I know that they call it by a different name, but it is the same design.

[floridaskier]

Is there any benefit to having a single (or double) position grip?
John, which Doppelmayr grip are you referring to? The new coil spring one is a single position, and the new torsion bar one is a double, just like the DT-104

[highspeedquad]

I think that the "T" grip with the springs allows easier testing of the force of the grip. I don't know if there is any force difference.

[barnstormer]

Garaventa's AK 4 grip was used up until at least 2000 on CTEC's detachable quads. This is a single action grip, i.e. it has to be operated open and then operated closed. One advange Garaventa used to tout is that the grip only cycles twice per revolution as opposed to four times with a double action grip. When I made the transition from Yan 7's (which were double action) to AK 4's, it made a whole lot of sense to me! I don't know if that is really a factor or not.

One disadvantage to the single action grip is that there is no way to open the grip in the terminal because...if it's in the terminal it should already be open. If you do maintenance on the grip and leave it in the closed position when you go to put it back on the line things might get ugly. CTEC has multiple limit switches to be sure that the grip is not closed in the terminal.

[highspeedquad]

I don't think that more actions drastically affects the grip, since it should be ready for a lot of use, and they design it to last a long time as well.