Such screw jack type operation provided enough mechanical advantage for rams to overcome downhole pressures and seal the wellbore annulus.
12.
Each front corner of the chassis was fitted with a swing-out A-frame boom equipped with a screw jack and foot plate.
13.
This property is also the basis for the use of screws in screw top container lids, vises, C-clamps, and screw jacks.
14.
The so-called Barlow-Greathead shield consisted of an iron cylinder in diameter fitted with screw jacks which enabled it to be jacked forward.
15.
Before bringing the crane to the location, screw jacks were used to shore up the underground garage roof to hold the crane's weight.
16.
Screw jacks were placed on the corners of the railcar and the car was raised slightly to take its weight off of its wheels.
17.
Screws are widely used in threaded fasteners to hold objects together, and in devices such as screw tops for containers, vises, screw jacks and screw presses.
18.
The forward bracket had a pivot point, and the rear a screw jack that rotated the entire sighting system up or down around the front bracket's pivot.
19.
Opposing rams ( plungers ) in the ram cavity translated horizontally, actuated by threaded ram shafts ( piston rods ) in the manner of a screw jack.
20.
You should already have a screw jack with your spare tire, and if not you should get one anyways so you don't get stuck when a tire goes.
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