14 replies to this topic

[Skier123]

I've always wondered, what are the main advantages and disadvantages of double-position grips?
What makes them better than regular detachable grips and what's not as good?

I believe that Doppelmayr Garaventa Group is the only company that makes detachable grips with this feature. Is there a reason for this, or is it just their personal preference?

Here's a picture of the DT-104, Doppelmayr's current double-position grip:
 sbe_grip.jpg (113.79K)
Number of downloads: 114

One last quick question: did the DS series detachable grip have the double-position feature?

[SkiBachelor]

While now part of the Doppelmayr Garaventa Group, Von Roll offered a double position grip.

[SuperRat]

The Doppelmayr DS is a double position grip

Pro 2 position: the grip cycles fewer times than single positions. Requires less PTO friction to launch (single position has to be opened before it can be coupled to the rope)

Con 2 position: the grip could fail to close (theoretically)

[Skier123]

Thank you.
Although the grip cycles fewer times on the double-position grip, wouldn't the spring (or torsion bar with the DT series) become worn out/less powerful from being open during the entire expanse of the terminal?

This post has been edited by Skier123: 12 February 2010 - 08:03 PM

[Allan]

Wouldn't the springs be relaxed with the grip open?

[Vincen]

Skier123, on 12 February 2010 - 08:03 PM, said:

Although the grip cycles fewer times on the double-position grip, wouldn't the spring (or torsion bar with the DT series) become worn out/less powerful from being open during the entire expanse of the terminal?

Well I don't know in US but here in France, grip has to be in closed position all the time (online and in terminal), it opens just to get out of cable or get on cable during few seconds !

Vincèn

[Skier123]

Vincen, on 12 February 2010 - 11:29 PM, said:

Well I don't know in US but here in France, grip has to be in closed position all the time (online and in terminal), it opens just to get out of cable or get on cable during few seconds !

Vincèn

I believe France is one of the European countries that banned double-position grips, which is one of the reasons why Doppelmayr still carries the Agamatic grip.

[liftmech]

Allan, on 12 February 2010 - 08:17 PM, said:

Wouldn't the springs be relaxed with the grip open?

The DS (the older Doppelmayr grip) is almost fully compressed with the grip locked open. The DT I don't know about. The CTEC/Garagenta grips that I've seen (mid-90s, don't know the name) are about the same spring tension whether closed or open.

[vons]

Dopp DT, DS both lock open holding force on the spring. BMF and LST use a grip that removes load from the grip springs while the grip is in the open position. The BMF and LST grips are legal in any EU nation.

Images are from R'montage.fr and loipolder.com.

One image shows the BMF grip in the open and closed position the other is the LST grip which has a self testing feature according to their web site

Attached File(s)

•  CIMG0673.jpg (32.26K)
  Number of downloads: 148
•  084.jpg (173.86K)
  Number of downloads: 154

[SuperRat]

Skier123, on 12 February 2010 - 08:03 PM, said:

Thank you.
Although the grip cycles fewer times on the double-position grip, wouldn't the spring (or torsion bar with the DT series) become worn out/less powerful from being open during the entire expanse of the terminal?

As I understand it Doppelmayr's extensive testing of the DT grips has shown the four steel torsion rods show no change in strength after many millions and millions of cycles.

Is anyone still performing non-destructive tests on the rods from their DT's? Our Level 3 wrote them out of the procedures some time ago.

[Skier123]

vons, on 13 February 2010 - 05:58 AM, said:

Dopp DT, DS both lock open holding force on the spring. BMF and LST use a grip that removes load from the grip springs while the grip is in the open position. The BMF and LST grips are legal in any EU nation.

Images are from R'montage.fr and loipolder.com.

One image shows the BMF grip in the open and closed position the other is the LST grip which has a self testing feature according to their web site

Are both of these grips manufactured by Doppelmayr?

This post has been edited by Skier123: 13 February 2010 - 02:11 PM

[vons]

The DS and DT grips are a Doppelmayr product. The pictures in my previous post are of BMF and LST products both companies are independent.

[seilbahnbilder.ch]

The BMF grip is just allowed in France because of a new law that is legal in all countries of the european union (+ Switzerland...).

[Skier123]

vons, on 14 February 2010 - 05:49 AM, said:

The DS and DT grips are a Doppelmayr product. The pictures in my previous post are of BMF and LST products both companies are independent.

So these are separate ski lift companies?

[vons]

yep

BMF


LST