English to French translations [PRO]
Tech/Engineering - Automotive / Cars & Trucks | | English term or phrase: block reduction | Dans la phrase "One telescopic crane with the minimum lifting capacity of 2.000 kg operated through a remote control, searchlight and device winch with block reduction that guarantees the minimum tensile force of 24 tons."
Dans un texte sur un véhicule de dépannage.
Merci |
| | | moufle / mouflage | Explanation:
= load reduction through use of snatch blocks
"Moufle (outil)
Une (ou un) moufle (muffula en latin médiéval) est un dispositif mécanique qui permet le levage d'une charge par plusieurs brins de câble, afin de démultiplier l'effort de traction.
Un palan est constitué d'une moufle supérieure fixe portant les poulies de renvoi et d'une moufle inférieure mobile supportant la charge.
* cas le plus simple : deux poulies, une poulie fixe et une poulie mobile ; la démultiplication est de deux.
* cas de plusieurs poulies mobiles : la démultiplication correspond au nombre de brins — donc au nombre total de poulies (fixe et mobiles) pour un palan. Par exemple, dans un mouflage à quatre brins, la tension du câble est de l'ordre du quart de la charge à lever (aux effets géométriques et dynamiques près) et la longueur de câble enroulée est de l'ordre de quatre fois la course de levage.
La moufle inférieure est constituée :
* d'une structure supportant une ou plusieurs poulies,
* généralement de dispositifs empêchant le désengagement du câble ou retenant la poulie en cas de rupture d'axe,
* d'un axe vertical laissant la charge libre en lacet,
* d'une interface avec les accessoires de levage permettant la manutention de la charge (crochet, système de brochage.."
http://fr.wikipedia.org/wiki/Moufle_(outil)
"Most notably referring to snatch blocks and their reduction of the load on the winch. Pat says that each snatch block you use halves the load on the winch. This is only true of the first snatch block. The second snatch block gives you a third length of cable between the winch and the anchor, meaning the load on the winch (total load divided by the number of cable strands) is one-third, not one-quarter as written in the magazine. In fact, while the first snatch block provides a 50% reduction in the load on the winch, the second only offers a further 17% reduction and by the time you add a third it only offers a further 8% reduction. To reduce the load on the winch to one-quarter of the total load you need three snatch blocks, not two as stated in the article. "
http://www.4wdaction.com.au/forum/viewtopic.php?f=7&t=45559&...
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Note added at 7 hrs (2011-04-21 05:55:27 GMT)
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"Snatch Block Basics
snatch block
This may be a silly question, but what's a snatch block? I've seen several winching accessories, but don't recall one being a snatch block.
"Snatch block" is a specific type of block. A "block" is a "sheave", which is a wheel with a grooved edge to hold the rope or cable, combined with an axle or pin, side plates and a means of attaching it to something, typically a hook or shackle. Blocks are used in "block & tackle" combinations using multiple sheaves and two block assemblies, to increase mechanical advantage. A "snatch block" is a specially-designed block which is used to "snatch" loads or anchors, and is designed so that the side plate can be opened or swung away for the easy insertion of a loop of rope or cable without having to thread a bitter end through the side plates, and can thus be inserted anywhere in the cable without having to remove the load first to change the direction of the cable pull. Snatch blocks are one of the most mis-understood and misused items in the RV winching field, and can cause enormous harm and death if not properly rigged. Remember, if you overload a cable/snatch block, and the block parts from the anchor, you have a 10 or more pound missile flying at great speed, which can kill instantly. The most important thing to remember about snatch block winching, as used in the typical 4wd sceneario, is that there is tremendous force applied to the block/anchor even when using a single-block system for a simple change of line direction."
http://www.dodgepowerwagon.com/glovebox/snatch.html |
| Selected response from:
 FX Fraipont
Belgium
Local time: 01:49
| Grading comment merci
4 KudoZ points were awarded for this answer |
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| Discussion entries: 0 |
|---|
Automatic update in 00:
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7 hrs confidence:   peer agreement (net): +2 moufle / mouflage
Explanation:
= load reduction through use of snatch blocks
"Moufle (outil)
Une (ou un) moufle (muffula en latin médiéval) est un dispositif mécanique qui permet le levage d'une charge par plusieurs brins de câble, afin de démultiplier l'effort de traction.
Un palan est constitué d'une moufle supérieure fixe portant les poulies de renvoi et d'une moufle inférieure mobile supportant la charge.
* cas le plus simple : deux poulies, une poulie fixe et une poulie mobile ; la démultiplication est de deux.
* cas de plusieurs poulies mobiles : la démultiplication correspond au nombre de brins — donc au nombre total de poulies (fixe et mobiles) pour un palan. Par exemple, dans un mouflage à quatre brins, la tension du câble est de l'ordre du quart de la charge à lever (aux effets géométriques et dynamiques près) et la longueur de câble enroulée est de l'ordre de quatre fois la course de levage.
La moufle inférieure est constituée :
* d'une structure supportant une ou plusieurs poulies,
* généralement de dispositifs empêchant le désengagement du câble ou retenant la poulie en cas de rupture d'axe,
* d'un axe vertical laissant la charge libre en lacet,
* d'une interface avec les accessoires de levage permettant la manutention de la charge (crochet, système de brochage.."
http://fr.wikipedia.org/wiki/Moufle_(outil)
"Most notably referring to snatch blocks and their reduction of the load on the winch. Pat says that each snatch block you use halves the load on the winch. This is only true of the first snatch block. The second snatch block gives you a third length of cable between the winch and the anchor, meaning the load on the winch (total load divided by the number of cable strands) is one-third, not one-quarter as written in the magazine. In fact, while the first snatch block provides a 50% reduction in the load on the winch, the second only offers a further 17% reduction and by the time you add a third it only offers a further 8% reduction. To reduce the load on the winch to one-quarter of the total load you need three snatch blocks, not two as stated in the article. "
http://www.4wdaction.com.au/forum/viewtopic.php?f=7&t=45559&...
--------------------------------------------------
Note added at 7 hrs (2011-04-21 05:55:27 GMT)
--------------------------------------------------
"Snatch Block Basics
snatch block
This may be a silly question, but what's a snatch block? I've seen several winching accessories, but don't recall one being a snatch block.
"Snatch block" is a specific type of block. A "block" is a "sheave", which is a wheel with a grooved edge to hold the rope or cable, combined with an axle or pin, side plates and a means of attaching it to something, typically a hook or shackle. Blocks are used in "block & tackle" combinations using multiple sheaves and two block assemblies, to increase mechanical advantage. A "snatch block" is a specially-designed block which is used to "snatch" loads or anchors, and is designed so that the side plate can be opened or swung away for the easy insertion of a loop of rope or cable without having to thread a bitter end through the side plates, and can thus be inserted anywhere in the cable without having to remove the load first to change the direction of the cable pull. Snatch blocks are one of the most mis-understood and misused items in the RV winching field, and can cause enormous harm and death if not properly rigged. Remember, if you overload a cable/snatch block, and the block parts from the anchor, you have a 10 or more pound missile flying at great speed, which can kill instantly. The most important thing to remember about snatch block winching, as used in the typical 4wd sceneario, is that there is tremendous force applied to the block/anchor even when using a single-block system for a simple change of line direction."
http://www.dodgepowerwagon.com/glovebox/snatch.html
| FX Fraipont
Belgium
Local time: 01:49
Works in field
Native speaker of:  French
PRO pts in category: 878
|
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