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The rugged Hi-Lift Jack helps off-roaders survive in the most demanding situations with the ability to lift, push, pull, winch and even clamp. Last year we rebuilt our 1980s vintage Hi-Lift Jack with genuine Hi-Lift Fix-It-Kit service parts (see related story Hi-Lift Jack Service & Rebuild). The current Hi-Lift Jack models are the most advanced, offering a rated capacity of 4,660 lbs.
In recent years, there have been a number of imitation I-beam-style off-road jacks surfacing.
In addition to everything the Hi-Lift jack does on its own, we really like the fact that their are a number of accessories available from Hi-Lift and the off-road aftermarket to further expand the functionality of this great tool. One thing hasn’t changed much: the challenge finding a good place to safely carry this tool. Overall we are really impressed with the latest Hi-Lift family of Jacks and the X-Treme model. So if you’re still messing around with the factory bottle jack that won’t lift your lifted truck, or maybe you don’t own a winch or any recovery gear, its time you get yourself a Hi-Lift. We use cookies to improve your experience on this website and so that ads you see online can be tailored to your online browsing interests.
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In climbing, a piton (pronounced Pee'-ton, also called a pin or peg) is a metal spike (usually steel) that is driven into a crack or seam in the rock with a hammer, and which acts as an anchor to protect the climber against the consequences of a fall, or to assist progress in aid climbing. Pitons were the original form of protection and are still used where there is no alternative.
If you are going to carry the hammer on your harness during a big route, it is useful to have a special hammer case. A jin-pole or gin pole is a rigid pole with a pulley on the end used for the purpose of lifting.
Not a very impressive length pole and soon found that rope doesn't grip smooth square timber very well (thinking of Rolling Hitch gripping any cylindrical object). And couldn't be bothered to grub around in the nettles to put the guy-line to the bottom of the left-hand-side pole (last picture) - just dropped a clove-hitch formed in the standing rope over the top of the post.
Moving upwards, the guy rope has a Constrictor Knot formed in the standing rope with I dropped over the top of the gin-pole and tightened-up as much as possible.
At the top there are a couple of Rolling Hitches to hold the stationary top-block (hadn't a short enough strop to do a useful Strop-Hitch on this small pole). A block and tackle[1][2] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift or pull heavy loads.
The pulleys are assembled together to form blocks so that one is fixed and one moves with the load. Seamen aboard the now-defunct USNS Southern Cross freighter rigged this block and tackle to make heavy lifts during cargo operations. Although used in many situations, they are especially common on boats and sailing ships, where motorized aids are usually not available and the task must be performed manually. If frictional losses are neglected, the mechanical advantage of a block and tackle is equal to the number of parts in the line that either attach to or run through the moving block, or the number of supporting ropes.
The mechanical advantage of a tackle dictates how much easier it is to haul or lift the load. Notice that there are two parts of the rope through each pulley in a block, and an additional part for the start of the rope that is attached to one of the blocks.

The Gun tackle, Double tackle and Threefold purchase have the same number of pulleys in both blocks, one, two and three, respectively.
For example, consider a block and tackle with two sheaves on both the moving block and the fixed block. This approximation is more accurate for smaller values of S and x.[7] A more precise estimate of efficiency is possible by use of the sheave friction factor, K (which may be obtainable from the manufacturer or published tables[8]). The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. A block and tackle, is characterized by the use of a single continuous rope to transmit a tension force around one or more pulleys to lift or move a load---the rope may be a light line or a strong cable. Consider the set of pulleys that form the moving block and the parts of the rope that support this block.
A gun tackle has a single pulley in both the fixed and moving blocks with two rope parts supporting the load W. A double tackle has two pulleys in both the fixed and moving blocks with four rope parts supporting the load W. The mechanical advantage of the gun tackle can be increased by interchanging the fixed and moving blocks so the rope is attached to the moving block and the rope is pulled in the direction of the lifted load. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. Bmw efficientdynamics : bmw concept 5 series activehybrid, Can a car become constantly more efficient and at the same time constantly more dynamic?
With a series of attachments available, the function of the Hi-Lift Jack can be multiplied exponentially—making this one of the best off-road tools to own. Hi-Lift read our story and appreciated that our 20-plus-year-old jack was still in use and on the trail.
It was specifically designed for the serious Hi-Lift user, offering the "top of the line" all-cast version (48" or 60" sizes) with special features that include, charcoal-metallic powder-coat finish, gold zinc-coated hardware and handle, and a special top winch-clamp-spreader attachment.
We opted for the new 60-inch Hi-Lift X-Treme Jack to be able and lift our 80 Series Land Cruiser and most lifted 4x4s, pre-runners or Jeeps we encounter that may need help. We really like the darker color and hope the powder coat finish will help it stay this way longer. The Hi-Lift is very much a part of what we do, no matter if you wheel in the snow, rocks, dirt or mud. Even if you own an older model like we did, the new design improvements Hi-Lift has made to increase the rated load capacity and functionality are a good reason to add a second to your first. Pitons are equipped with an eye hole or a ring to which a carabiner is attached; the carabiner can then be directly or indirectly attached (through more equipment) to a climbing rope. Repeated hammering and extraction of pitons damages the rock, and climbers who subscribe to the clean climbing ethic avoid their use as much as possible. The lower portion of the jin-pole is attached to the upper exterior of an existing tower or structure. This is a 3-by-3 setup, which should give a 6-to-1 mechanical advantage (it gives a 6-to-1 velocity ratio - you have to pull 6 times the length of rope out over the lead sheave for every 1 length the load moves - while friction reduces the true mechanical advantage below the velocity ratio).
When rope or line is run through a block or a series of blocks the whole assembly is called a tackle.
A tackle with a mechanical advantage of 4 (a double tackle) will be able to lift 100 lbs with only 25 lbs of tension on the hauling part of the line. The velocity ratio of a tackle refers to the relative velocities of the hauling line to the hauled load.

If there are p pulleys in each of the blocks then there are 2p parts for one block and 2p+1 for the other block.
One block has four lines running through its sheaves, and the other block also has four lines including the part of the line being pulled or hauled, with a fifth line attached to a secure point on the block.
In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary to pull 6 metres of rope through the blocks.
On the other hand, if the load is to be hauled parallel to the ground, there is a benefit to reeving the block and tackle to advantage, because the pulling force is in the direction of the load movement allowing the individual to manage obstacles. If the rope and pulley system does not dissipate or store energy, then its mechanical advantage is the number of parts of the rope that act on the load. Just head to your local 4x4 trail and you’re sure to find a Hi-Lift strapped to a truck, Jeep or 4WD. This extra half-inch helps make sure there is good surface contact when lifting, pulling or clamping.
With the popularization of clean climbing in the 1970's, pitons were largely replaced by faster and easier-to-use clean protection, such as nuts and camming devices. Lash a block to the gin pole about 2 feet from the base of the pole, the same as was done for the tackle lashing at the top, and place a cleat above the lashing to prevent slipping. This means if the block with the rope attachment is selected for the moving block, then the mechanical advantage is increased by one.
If the hauling part is coming out of the fixed block, the block and tackle will have a mechanical advantage of four. Frictional losses also mean there is a practical point at which the benefit of adding a further sheave is offset by the incremental increase in friction which would require additional force to be applied in order to lift the load.
The hauling part is pulled from the fixed block.[5] While roving to advantage is the most efficient use of equipment and resources ( Roving to disadvantage simply adds an extra sheave to change the direction of the pulling line. Founded by the late Philip John Harrah, the company is still owned and operated by the Harrah family.
It’s been exposed to freezing temperatures, heat, dirt, rain and snow with no issues or signs of rust so far. Pitons are still found in place (as 'fixed' pitons) on some established free-climbing routes in places where nuts or cams do not work; and are used on some hard aid climbs. This block serves as a leading block on the fall line which allows a directional change of pull from the vertical to the horizontal. In other words, to raise a load at 1 metre per second, the hauling part of the rope must be pulled at 4 metres per second. If the tackle is reversed, so that the hauling part is coming from the moving block, the mechanical advantage is now five. Too much friction may result in the tackle not allowing the load to be released easily,[9] or by the reduction in force needed to move the load being judged insufficient because undue friction has to be overcome as well.
This doesn't change the velocity ratio but increases friction losses ), there are several situations in which roving to disadvantage may be more desirable, for example when lifting from a fixed point overhead.
The decision of which to use depends on pragmatic considerations for the total ergonomics of working with a particular situation.
Fortunately many of the leading off-road bumper and rack manufacturers have found creative ways to incorporate mounting points for the jack.

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  1. VersacE, 16.02.2014
    Green vegetables i am following the concept the better meyers and Nor Cal.
  2. SEBINE1, 16.02.2014
    And veg in a Produce Show - effectively now.
  3. 2018, 16.02.2014
    With this Vegetable Garden Plan (pdf) , which tank (comprised of a recycled Tote.