advantages and disadvates of screw jack

A jackscrew is a type of jack that is operated by turning a leadscrew. In the form of a screw jack it is commonly used to lift moderately heavy weights, such as vehicles. More commonly it is used as an adjustable support for heavy loads, such as the foundations of houses, or large vehicles. These can support a heavy load, but not lift it.A screw jack is a simple machine. It is used to lift cars or heavy automobiles. It consists of a long screw rod which passes through a threaded block B and a handle . Th ....etc

[:=Read Full Message Here=:]

download ppt on automatic screw jack

Abstract

Screw type mechanical jacks were very common for jeeps and trucks of World War II vintage. For example, the World War II jeeps were issued the Jack, Automobile, Screw type, Capacity 1 and 1/2 ton, Ordnance part number 41-J-66. This jacks, and similar jacks for trucks, were activated by using the lug wrench as a handle for the jack's ratchet action to of the jack. The 41-J-66 jack was carried in the jeep's tool compartment. Screw type jack's continued in use for small capacity requirements due to ....etc

[:=Read Full Message Here=:]

I need some important video and images and writen details of automatic screw jack ....etc

[:=Read Full Message Here=:]

SCREW JACK Duff-Norton line of screw jacks (mechanical actuators) includes mechanical actuators (machine screw and ball screw) ranging in size from 1/4 ton to 350 tons, stainless steel machine screw actuators, micro-miniature actuators, high duty cycle actuators, motorized machine screw and ball screw actuators, electric cylinders and motor control systems. Accessories include miter gear boxes, c-face motor adapters, limit switches, transducers, visual and digital position indicators, couplings, ball screws and ball screw systems, and locking r ....etc

[:=Read Full Message Here=:]

It is a urgent requirement of design of electric scissor jack in pro engineering software. I hope it is useful for us. thank you.
please give me a some design for electric jack in pro engineering ....etc

[:=Read Full Message Here=:]

ABSTRACT
A screw tube assembly is disclosed for use in a screw jack or the like. The screw tube assembly comprises a hollow tube member in one end of which is formed a recess so as to reduce the tube member wall thickness. Into this recess an annular bushing is inserted. A tip portion of the recessed tube wall is crimped over the received bushing outer end to lock the bushing in the tube against axial movement. A chordal portion of the bushing and overlying tube is then displaced radially outwardly to form an external tube assembly key and to ....etc

[:=Read Full Message Here=:]

Abstract:

Scissor jacks are simple mechanisms used to drive large loads for short distances. The power screw design of common scissor jack reduces the amount of force required by the user to drive the mechanism. Most scissor jacks are similar in design, consisting of four main members driven by a power screw. In this report, a unique design of a scissor jack is proposed which is very easy to manufacture. Each member, including the power screw sleeves, is made of the common c-shape. This eliminates the need for machined power s ....etc

[:=Read Full Message Here=:]

screw jack using bevel gear report pdf download

Considering factors such as load, speed, torque and space, there s no debate that bevel gear jack systems offer unique benefits to worm gear jack systems. The system s long-duty cycle capabilities and multiple configurations make it a diverse product that suits a variety of applications.

Although worm gear jacks are sufficient for large loads that are infrequently moved, bevel gear jacks offer more flexibility and programmable options for a wider range of applications.

Bevel gear jack system ....etc

[:=Read Full Message Here=:]

The remote controlled screw jack is a modified form of the commonly used screw jack. It uses motor as the energy source to lift the object and the gearbox is used to control the lift of the jack. In this project, the conventional motorised cylindrical lifting jack is modified by adding an additional ring in the centre for the purpose of gripping the v belt assembly. A v belt pulley is added at the output shaft of the 12v big DC motor. The entire structure and assembly is held in position by an angle iron based assembly. The entire project is ru ....etc

[:=Read Full Message Here=:]

mechanical screw jack advantages and disadvantages ....etc

[:=Read Full Message Here=:]