Scissor Jack

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  • Topic: Screw thread, Jack, Hydraulics
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  • Published : June 1, 2011
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Cecil hills high school

Engineering Studies

Lifting Devices



Part A Examination of current lifting devices (40 marks)

You are to prepare a report comparing two lifting devices used to raise motor vehicles. Compare and contrast the two devices, explain their advantages and disadvantages. Your report will include;
• a photograph and sketch of each lifting device and the lifting capacity, • a comparison on the 2 different methods of application,
• a table examining each part of one device;- manufacturing method, material used • the calculated mechanical advantage and velocity ratio of one device • A scaled sectioned assembly drawing of the main screw bolt and nut of a car jack. You must also recommend one (1) of the two (2) for emergency roadside use with a large family car, such as a Commodore or Falcon (of course). Explain why you are recommending this lifting device over the other one.

Table of Contents

List of Figures


N Newton’s

kN Kilo Newton’s

MPa Mega Pascal’s

MA Mechanical Advantage

F Force

L Load

E Effort

A Area

Lifting Devices

A mechanical jack is a device which lifts heavy equipment. The most common form is a car jack, floor jack or garage jack which lifts vehicles so that maintenance can be performed. Car jacks usually use mechanical advantage to allow a human to lift a vehicle by manual force alone. More powerful jacks use hydraulic power to provide more lift over greater distances. Mechanical jacks are usually rated for a maximum lifting capacity for example, 1.5 tons or 3 tons. The scissor jack is made for a modern vehicle and the notch fits into a hard point on a unibody. Earlier versions have a platform to lift on the vehicles' frame or axle. There are available...
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