An automotive jack is a device used to raise all or part of a vehicle into the air in order to facilitate repairs. Most people are familiar with the basic car jack (manually operated) that is still included as standard equipment with most new cars. These days, a car jack is an important tool to have in our vehicle due to unknown upcoming event such as flat tire in our journey. Even so, people who like to rotate their tires themselves or who may install snow tires before the winter and remove them in the spring need to use a jack to perform the job. Changing a flat tire is not a very pleasant experience. Women have a much lighter skeleton that means, among other things, woman can’t pull more forces as well as men and are at greater risk of skeletal injuries. Usually the car purposely tries to get a flat tire at the least opportune moments.

1. 1
A
PROJECT REPORT
ON
“AUTOMATIC SCREW JACK
FOR LIGHT VEHICLES”
Project report submitted in partial fulfillment of the
Requirements for the degree
Of
B.TECH
MECHANICAL ENGINEERING
By
MD. ASIF
(13EGCME724)
DEPARTMENT OF MECHANICAL ENGINEERING
Global College of Technology,
Sitapura, Jaipur 302022
2016-17

2. 2
Global College of Technology
DEPARTMENT OF MECHANICAL ENGINEERING
JAIPUR (RAJASTHAN)-302022
CERTIFICATE OF APPROVAL
This is to certify that this project on “Automatic Screw Jack for Light Vehicles” is
submitted by (Md. ASIF, Univ. Roll. No- 13EGCME724) to the Department of
Mechanical Engineering, GCT, Jaipur, for the award of the degree in B.Tech
Mechanical Engineering is a bonafide record of work carried out by him. The contents
of this Project Report, in full or in parts have not been submitted to any other Institute
or University for the award of any degree or diploma.
Name and Sign Mrs. Bhavana Mathur
(Project Guide) (Head of Department)

3. 3
ACKNOWLEDGEMENT
I would like to express my special thanks of gratitude to my project guide Dr V.N. Shukla, and
Mr.Dinesh Kumar, Assistant Professor, Department of Mechanical Engineering, Global
College of Technology, Jaipur for introducing the present topic and for their inspiring guidance,
constructive criticism and valuable suggestions throughout the research.
I am also thankful to Mrs. Bhavana Mathur, Head of Department Mechanical Engineering,
Global Technical Campus for her constant support and encouragement and I am also grateful
for their help and support in providing us valuable data and encouraging us to make this project.
My sincere gratitude towards the entire Mechanical Department, GTC, Jaipur for their
continuous support and help whenever needed, as without their help and guidance, it would not
have been possible to accomplish this research.
Last but not least, my sincere thanks and appreciations to all the members of my team (Md.Asif,
Md. Mozzammil, Prince Hussain, Shahbaz Alam and Shaney Alam) students of B.Tech,
Mechanical Engineering, GCT, Jaipur.

4. 4
INDEX
Topic Page NO.
1 Introduction 5-8
1.1 Advantages 6
1.2 Disadvantages 7
1.3 Applications 8
2 Literature Review 9
3 Project Description and Data 10-41
3.1 Automated Car Jack 10
3.2 Automation of Jack 11
3.3 Assembly of parts
3.4 Principle of Automatic Screw Jack
12
3.5 Components of Automatic Screw Jack 16
3.6 Working of Automatic Screw Jack
3.7 Components Specifications
3.8 Cost Details
27
4 Conclusion 31
5 References 32

5. 5
CHAPTER – 1
INTRODUCTION
An automotive jack is a device used to raise all or part of a vehicle into the air in order to
facilitate repairs. Most people are familiar with the basic car jack (manually operated) that is
still included as standard equipment with most new cars. These days, a car jack is an important
tool to have in our vehicle due to unknown upcoming event such as flat tire in our journey.
Even so, people who like to rotate their tires themselves or who may install snow tires before
the winter and remove them in the spring need to use a jack to perform the job. Changing a flat
tire is not a very pleasant experience. Women have a much lighter skeleton that means, among
other things, woman can’t pull more forces as well as men and are at greater risk of skeletal
injuries. Usually the car purposely tries to get a flat tire at the least opportune moments. On
average, 160 injuries are associated with car jacks each year. Injuries have ranged from
amputation to fractures and crush injuries. The correct use of jacks can prevent death or injury.
Improvement in automotive car jack is really needed to make the tool more efficient, user-
friendly, practical to use, changes in industry direction and most importantly high safety
features. Further research on car jack is very important. Operating the manual car jack is quite
difficult job for pregnant women and old men. The purpose of this project is to encounter these
problems. An electric car jack works on current supply from the car battery itself making it
easy to operate. Operator only needs to press the button from the controller without working in
a bent or squatting position for a long period of time to change the tire. In order to fulfill the
needs of present car jack, some improvement must be made
Keywords: Electric car jack, flat tires, crush injuries, improvements in jack, high
safety features, car battery, easy to operate.

6. 6
1.1 ADVANTAGES
1. The main advantage of automatic screw jack is that they are self locking.
2. The self locking system means that when the rotational force of motor on the screw is
removed then it will remain motionless where it was left and will not rotate
backwards, regardless of how much force acting on it.
3. The mechanical advantage of automatic screw jack is that the ratio of force the jack
exerts on the load to the input force ignoring friction will be-
Fload = 2𝝅𝐫
Fin l
Fload is the force the Jck exerts on the load.
FIn is the rotational force exerted on the Motor of the jack.
r is the length of the Jack shaft from the screw axis to where the force I applied.
l is the lead of the screw.
4. The actual Mechanical Advantage is often only 30 % to 50 %.

7. 7
1.2 DISADVANTAGES
Screw Jacks are limited in their lifting capacity. Increasing load increases friction
within the screw threads. A fine pitch thread, which would increase the advantage of
the increase the advantage of the screw jack, also reduces the size and strength of
the threads. Longer operating levers will soon reach a point where the lever will
simply bend at their inner end.
Automatically Screw Jack have now largely replaced traditional old Mechanical
Jacks which are manually operated. This was encouraged by the Tangye Company
in 1858 to Brahmah’s hydraulic concept were applied to the successful launching of
Brunel’s SS Great Britain, after two failed attempts.
The maximum mechanical advantage possible for a Automatic Screw Jack has no
limited and can be far greater in comparison to Traditional Manuel Jacks.

8. 8
1.3 APPLICATIONS
The large area of sliding contact between the screw threads means the screw jacks
have a high friction and low efficiency as power transmission leakages from Motor
is around 30% to 50%. So they are often used for continuous transmission of high
power, but more often in intermittent positioning Applications.
In heavy duty applications, such as Screw jacks having a Square thread or Buttress
thread is used because it has the lowest friction and wear.
In technical applications, such as actuators an Acme thread is used although it has
higher friction because it is easy to manufacture, wear can be compensated for, it is
stronger than a comparably sized square thread and it makes for smoother
engagement.
An Automatic Screw Jack are sussed extensively in Aviation and are use to raise
the horizontal stabilisers.

9. 9
CHAPTER – 2
LITERATURE REVIEW
A Screw type mechanical jacks were very commonly referred in jeeps and trucks at World
War II vintage. For ex., the World War II jeeps (Ford GPW and Willys MB) were introduced
with the Jack, Screw type, Capacity 1 1/2 ton, Ordnance part number 41-J-66. In that day’s,
the 41-J-66 jack was carried in the jeep's tool box. Screw type jacks preferred continued for
small capacity use due to minimum cost of production for raise or lower the load. It had
negligible maintenance.
The concept of using a screw as a machine was first demonstrated by Archimedes in 200BC
with his device used for pumping water. There is also evidence that screws were preferred in
the Ancient Roman world. But, In the late 1400s, the Leonardo da Vinci, who first displayed
the method of use of a screw jack for lifting the loads. Its design used a threaded worm gear,
supported on bearings, which is rotated by the turning of a worm shaft to drive a lifting screw
to move the load instantly recognisable as the principle used today.
Thomas J. Prather (2009): In this, there was a introduction about vehicle lift system. A drive
assembly was mechanically coupled to the piston. The drive assembly was operated in first
direction to raise an upper end of the piston with respect to the housing. The drive assembly
was operated in a second direction to lower the upper end of the piston with respect to the
housing. The drive assembly was coupled to the power supply port which is removable to
supply electrical power to the drive assembly.
Farhad Razzaghi (2007): In this, electrically powered jack shown for normally raising and
lowering of automobile from ground surface. The mechanism may be used in joining with a
typical portable car jack, during which the mechanism constitute a power drill, a rod, and a
numerous jack adapters.
Manoj Patil (2014): In this general article, screw jack is to developed to overcome the human
effort. It is actually difficult job to operate for pregnant women and old person. Changing the
tyre is not a pleasant experience. Especially women can’t apply more force to operate. For that,
electric operated car jack is introduced.
Lokhande Tarachand (2012): This paper referred to Optimise the efficiency of square
threaded mechanical screw jack by varying different helix angle.

10. 10
CHAPTER – 3
PROJECT DESCRIPTION AND DATA
3.1 Automated Car Jack
An automotive jack is a device used to raise all or part of a vehicle into the air in order to
facilitate repairs. Most people are familiar with the basic car jack (manually operated) that is
still included as standard equipment with most new cars.
A mechanical jack is a device which lifts 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. 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). Available jack in market is
shown in Fig 1.
Figure 1 Mechanical toggle jack
Toggle jacks show in Fig 1 are simple mechanisms used to drive large loads for short distances.
The power screw being of identical shape, and often also with that shape on the other gear.
Two or more gears working in tandem are called a transmission and can produce a mechanical
advantage through a gear ratio and thus may be considered a simple machine. Geared devices
can change the speed, torque, and direction of a power source. When two gears mesh, and one
gear is bigger than the other (even though the size of the teeth must match), a mechanical
advantage is produced, with the rotational speeds and the torques of the two gears differing in
an inverse relationship.

11. 11
3.2 AUTOMATION OF JACK
We have developed a system which can be used with the toggle jack which makes it automatic
in operation. This assembly of parts can be detached easily from the main body of jack which
makes the system easier to handle. The parts required are as follows:
The Automotive Electrical System
The automotive electrical consist of many system and components each having specific
purpose. It includes the electric generator, electric battery and various connections. This energy
from battery can be utilized to make the jack automatic in operation.
Gearing System
A gear is a rotating machine part having cut teeth which mesh with another toothed part in
order to transmit torque, in most cases with teeth on the one gear so that the motor can spin
forwards or backwards when we want it to. To build a bidirectional DC motor circuit, we need
to use a switch, so that we can go back and forth when we want between forward motion and
reverse motion. And the type of switch which is best for this is a Double Throw (DPDT) switch.
This will allow us to make connections to the DC motor so that in one direction, the positive
voltage is connected to the positive lead of the DC motor and the ground of voltage is connected
to the negative lead of the DC motor, and in the other way, the positive voltage is connected to
the negative lead of the DC motor and the ground voltage is connected to the positive lead of
the motor. This will allow forward and reverse voltage with the flip of a switch.
Screw Jack
It is a jack which is operated by turning a lead screw. In the form of a screw jack it is commonly
used to lift heavy weights such as the foundations of houses, or large vehicles. A screw jack
consists of a strong screw shaft which extends vertically from a heavy supporting base, and is
turned with a bar or lever. On the upper end of the screw is a bearing surface which supports
the load. When the screw is rotated it extends, lifting the load.
Gear Mechanism
The Gear mechanism plays a vital role in transmitting the power/torque from Motor to the
Screw Jack to perform this The Pinion and Gear have different number of teeth giving a gear
ratio of 1.5 and reducing the speed of the motor in the same ratio.

12. 12
Motor
The motor required in this project is not easy to find as it should have the capability to run
from a car battery producing 12V and at the same time producing huge Amount of Torque so
as to lift the vehicle with low r.p.m. of 80-100. Also the motor should be bipolar as it should
be capable to lift as well as to put down the vehicle when the whole work is performed
3.3 ASSEMBLY OF PARTS

13. 13
Motor assembly
The fig. 4 shows motor assembly. It consists of motor, pinion, pinion bush, bracket, Allen
bolts and washers. The pinion is connected to motor shaft through bush and Allen bolt also
the bracket is connected to motor with the help of two Allen bolts. When the motor is rotated
the pinion rotates which in turn rotates the gear on the lead screw.
Figure 4 Motor assembly
Screw Assembly
This assembly is shown on fig 5. It connects gear to lead screw through bush and Allen bolt.
Also connects side block to motor through bracket. The side block is fitted over the screw.
Thus when the gear is rotated the jack gives its up and down motion.
Figure 5 screw assembly
Overall Assembly

14. 14
It gives idea about all the parts that are required to be added to normal toggle jack to make it
automatic. The fig 6. Shows relative positions of different parts and how they are connected
to each other.
Figure 6 Overall assembly
3.4 PRINCIPLE OF AUTOMATIC SCREW JACK

15. 15
When the worm shaft is rotated the lead screw rotates in the body of the screw jack at the same
rate as the worm gear. The nut on the lead screw moves in a linear direction along the screw
when fixed to a structure that prevents it from rotating with the screw. This design is also
available with a "Safety Nut".
When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to
rotate. For rotating screw jacks the lead screw is fixed to the worm gear and they rotate at the
same speed. As the worm gear turns, the friction forces on the screw thread act to turn the nut
also. The greater the load on the screw jack unit, the greater the tendency of the nut to turn. It
is obvious that if the nut turns with the screw, it will not raise the load. Therefore the nut needs
to be fixed to a structure to prevent rotation. The restraining torque required for the structure,
also known as the "lead screw key torque”.
Maximum input speed in rpm (revolutions per minute) to a screw jacks worm shaft should not
exceed 1800 rpm for E-Series and M-Series screw jacks; however the high performance S-
Series screw jacks can operate at up to 3000 rpm. Power Jacks cannot accept responsibility for
the overheating and rapid wear that may occur should these limits be exceeded. Power increases
in direct proportion to the speed, and the motor size will be out of proportion to the screw jack
model design rating should the speed become excessively high.

16. 16
3.5COMPONENTS OF AUTOMATIC SCREW JACK
1. FRAME
2. SCREW JACK SYSTEM
3. A DC MOTOR
4. CONNECTING SHAFT AND GEAR.
5. BATTERY
6. WIRES AND SWITCHES
7. OTHER REQUIRED ACCESSORIES

17. 17
FRAME
Fig. Frame of the Screw Jack
Frame is the basic component of the Automatic Screw Jack. Frame is used to support the whole
weight if the Automatic Screw Jack Setup. It is used to mount all the other components of
Automatic Screw Jack over it.
The Frame that we use in this project is made up of iron blocks. The whole Frame is made up
of Four Iron L rods which are joined by the application of Welding in such a way that they
form a rectangular base for the whole Automatic Screw Jack Device.
The dimension of the Frame is 80 x 40 cms2. The Material of Frame should be tough so that it
can withstand heavy loads. Therefore it important to built a strong base frame for the Automatic
Screw Jack.

18. 18
SCREW JACK AND THREAD SYSTEM
Fig. Screw Jack System
A screw thread, often abbreviated thread, is a helical structure used to convert between
rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder
or cone in the form of a helix, with the former being called a straight thread and the latter called
a tapered thread. More screw threads are produced each year than any other machine element.
The mechanical advantage of a screw thread depends on its lead (pitch) the linear distance
along the screw between successive threads. In most applications, the pitch of a screw thread
is chosen so that friction is sufficient to prevent linear motion being converted to rotary that is
so the screw does not slip even when linear force is applied so long as no external rotational
force is present. This characteristic is essential to the vast majority of its uses. The tightening
of a fastener's screw thread is comparable to driving a wedge into a gap until it sticks fast
through friction and slight plastic deformation.
Angle
The angle characteristic of the cross-sectional shape is often called the thread angle. For most
V-threads, this is standardized as 60 degrees, but any angle can be used.
Lead, pitch, and starts
Lead and pitch are closely related concepts. The difference between them can cause confusion,
because they are equivalent for most screws. Lead is the distance along the screw's axis that is
covered by one complete rotation of the screw (360°). Pitch is the distance from the crest of
one thread to the next. Because the vast majority of screw threadforms are single-start
threadforms, their lead and pitch are the same. Single-start means that there is only one "ridge"
wrapped around the cylinder of the screw's body.

19. 19
Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of
one ridge. "Double-start" means that there are two "ridges" wrapped around the cylinder of the
screw's body. Each time that the screw's body rotates one turn (360°), it has advanced axially
by the width of two ridges. Another way to say the same idea is that lead and pitch are
parametrically related, and the parameter that relates them, the number of starts, often has a
value of 1, in which case their relationship becomes equivalence.
Diameters
There are several relevant diameters for screw threads: major diameter, minor diameter, and
pitch diameter.
Major diameter
Major diameter is the largest diameter of the thread. For a male thread, this means "outside
diameter", but in careful usage the better term is "major diameter", since the underlying
physical property being referred to is independent of the male/female context. On a female
thread, the major diameter is not on the "outside". The terms "inside" and "outside" invite
confusion, whereas the terms "major" and "minor" are always unambiguous.
Minor diameter
Minor diameter is the smallest diameter of the thread.
Pitch diameter
Pitch diameter, also known as mean diameter, is a diameter in between major and minor. It is
the diameter at which each pitch is equally divided between the mating male and female
threads. It is important to the fit between male and female threads, because a thread can be cut
to various depths in between the major and minor diameters, with the roots and crests of the
thread form being variously truncated, but male and female threads will only mate properly if
their sloping sides are in contact, and that contact can only happen if the pitch diameters of
male and female threads match closely. Another way to think of pitch diameter is "the diameter
on which male and female should meet.

20. 20
A DC MOTOR
Fig. A DC Motor
One of the first electromagnetic rotary motors was invented by Michael Faraday in 1821 and
consisted of a free-hanging wire dipping into a pool of mercury. A permanent magnet was
placed in the middle of the pool of mercury. When a current was passed through the wire, the
wire rotated around the magnet, showing that the current gave rise to a circular magnetic field
around the wire. This motor is often demonstrated in school physics classes, but brine (salt
water) is sometimes used in place of the toxic mercury. This is the simplest form of a class of
electric motors called homopolar motors. A later refinement is the Barlow's Wheel.
Another early electric motor design used a reciprocating plunger inside a switched solenoid;
conceptually it could be viewed as an electromagnetic version of a two stroke internal
combustion engine.
The modern DC motor was invented by accident in 1873, when Zénobe Gramme connected a
spinning dynamo to a second similar unit, driving it as a motor.
The classic DC motor has a rotating armature in the form of an electromagnet. A rotary switch
called a commutator reverses the direction of the electric current twice every cycle, to flow
through the armature so that the poles of the electromagnet push and pull against the permanent
magnets on the outside of the motor. As the poles of the armature electromagnet pass the poles
of the permanent magnets, the commutator reverses the polarity of the armature electromagnet.
During that instant of switching polarity, inertia keeps the classical motor going in the proper
direction.

21. 21
DC MOTOR (WIPPER)USED IN THIS PROJECT
APPLICATION:
Designed for wind shield wiping on light commercial and commercial vehicles
RATINGS:
(System voltage: 12V)
Polarity: Insult return or negative earth
Operating ambient temperature: -20ºC to + 90ºC
Characteristics:
Typical light running current wet screen) : 1.5 Amps (normal speed)2.5 Amps (high speed)
Rated torque (cold) at output gear: 18 - 29 Nm at 13.5 V Operating Speed: normal
Normal speed: 43 wipes per minute
High speed: 70 wipes per minute
Angle of wipe: Max 120º
Weight: 2 kg

22. 22
FEATURES:
 This wiper motor has the capacitor connected in parallel to power supply to minimize
radio interference.
 A thermal cut out is provided as a protective device to protect the armature winding in
the event of a blade block.
 A ball bearing is provided on the commentator end of the armature to minimize friction
losses and thereby increase torque of the wiper motor.
Mounting:
Three-point stud fixing from gearbox base with M6 bolt Life: Continuously rated for 750 hours.

23. 23
Connecting Shaft and Gear
Fig. Connecting Shaft and Gear
A gear train consists of one or more gear sets intended to give a specific velocity ratio, or
change direction of motion. Gear and gear train types can be grouped based on their application
and tooth geometry.
Table I: Gear Types Grouped According to Shaft Arrangement
Parallel Axes
Intersecting
Axes
Non-Intersecting
(Non-parallel) Axes
Rotary to
Translation
Spur Gears Bevel gears: Hypoid gears Rack and Pinion
Helical Gears Straight bevel Crossed helical gears
Double helical gears Zerol bevel Worm gears
Spiral bevel
GEAR MECHANISM

24. 24
A gear or more correctly a "gear wheel" is a rotating machine part having cut teeth, or cogs,
which mesh with another toothed part in order to transmit torque. Two or more gears working
in tandem are called a transmission and can produce a mechanical advantage through a gear
ratio and thus may be considered a simple machine. Geared devices can change the speed,
magnitude, and direction of a power source. The most common situation is for a gear to mesh
with another gear; however a gear can also mesh a non-rotating toothed part, called a rack,
thereby producing translation instead of rotation.
The gears in a transmission are analogous to the wheels in a pulley. An advantage of gears is
that the teeth of a gear prevent slipping.
When two gears of unequal number of teeth are combined a mechanical advantage is produced,
with both the rotational speeds and the torques of the two gears differing in a simple
relationship.
In transmissions which offer multiple gear ratios, such as bicycles and cars, the term gear, as
in first gear, refers to a gear ratio rather than an actual physical gear. The term is used to
describe similar devices even when gear ratio is continuous rather than discrete, or when the
device does not actually contain any gears, as in a continuously variable transmission.
GEAR USED IN THIS PROJECT

25. 25
A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw)
meshes with a worm gear (which is similar in appearance to a spur gear, and is also called
a worm wheel). The terminology is often confused by imprecise use of the term worm gear to
refer to the worm, the worm gear, or the worm drive as a unit.
Like other gear arrangements, a worm drive can reduce rotational speed or allow
higher torque to be transmitted. The image shows a section of a gear box with a worm gear
being driven by a worm. A worm is an example of a screw, one of the six simple machines.A
worm gear is used when a large speed reduction ratio is required between crossed axis shafts
which do not intersect. A basic helical gear can be used but the power which can be transmitted
is low. A worm drive consists of a large diameter worm wheel with a worm screw meshing
with teeth on the periphery of the worm wheel. The worm is similar to a screw and the worm
wheel is similar to a section of a nut. As the worm is rotated the worm wheel is caused to
rotate due to the screw like action of the worm. The size of the worm gear set is generally
based on the centre distance between the worm and the worm wheel.
BATTERY

26. 26
Battery is used to provide a power source to the motor. A Battery in this project is essential
component to run the motor for lifting up the vehicles. In General, for this project is use a
separate battery for the power generation in the motor but in actual practice the power source
is provided by the battery of the car.
A 12 Volt (7.5 Ah and initial current – 2.1 A) battery is used in this project to run the Automatic
Screw Jack
3.6WORKING OF AUTOMATIC SCREW JACK

27. 27
With the above stated attachment to the jack the jack becomes automatic in operation.
When the motor is connected to battery of car, current flows through motor. A switch is
provided for changing the polarity of motor. Hence as the motor rotates the pinion
connected to it rotates. The pinion is in mesh with the gear on the lead screw. Because of
the gear ratio provided the torque gets multiplied and required torque is applied at the
screw. As the screw of jack rotates the jack moves up. The whole assembly is required to
be moved in horizontal as well as vertical direction simultaneously. This is achieved by
bracket attachment provided between motor and jack. Now when the jack is lifted
sufficiently to remove the tire the switch is made off. The tire then can be easily removed.
After repairing the tire it is fixed to car. Now with the help of switch the current supply can
be reversed so that the jack can be lowered. In this way the jack can be operated easily
without much fatigue.
3.7 COMPONENTS SPECIFICATIONS

28. 28
Specifications of Motor as Per Project
 12vdc Electric motor
 Stall Torque 171.445(mN.m)
 Max Efficiency 59.23%
 Torque at peak efficiency 24.002(mN.m)
 Current at load 2.146(A)
 Power 15.91(w)
 No load current=0.377(A)
 400RPM
 High torque, (using a 3mm pitch and 12mm dia screw can provide 40lbs linear force)
 All metal gears
 Current draw 3amps
 6mm dia shaft with flat
 Replacement motor for tube actuators model FA-04 models
Graph

29. 29
Power Required
Length of Portion of Lead Screw Bet. The 2 heads
Fig. Graph Representing Variation of Power with the Portion of Lead Screw between the 2
Brackets
3.7COST DETAILS OF COMPONENTS AND PROJECT

30. 30
Motor 1000
Battery 1200
Screw Jack 800
Shaft 350
Frame 500
Switch and Wires 150
Labor Cost 500
Lead Screw 500
Total Cost 5000/-
CHAPTER – 4

31. 31
CONCLUSION
This jack is highly desirable jack to become available in vehicles that can be operated by the
electric D.C. Motor and the electric supply is given to motor from vehicle battery. Such a
jack is should be compact. Hence it can easily store in an automobile. That whole design is
control by a switch so that jacking can be done from a position of safety. It should be easily
movable and other support surface is not required. Thus, the design has been developed
considering all the above requirements. This is the beneficial in lifting and lowering of loads.
The existing design was modified by introduction of an electric motor in the power screw,
connecting gear with the pinion, the electric switch connected to the motor and plugged to the
automobile 12V battery source to generate power for the prime mover (motor), in order to
make load lifting easier. In this modified design, the power screw is rotated through its gear
when electrical power flows through it. The main advantages of the modified design over the
existing design are that the modified designed motorised jack will save time, be faster and
easier to operate and requires less human energy and additional work to operate. There by
effectively curb the problems associated with Ergonomics - which is a fundamental concept
of design process.
Considering all available car jacks in the market, this prototype can be improved by a few
modifications on the features and design. The objectives are to design a car jack that is safe,
reliable and able to raise and lower the level, to develop a car jack that is powered by internal
car power and automated with button system.
Based on the testing and results from the analysis, it is considered safe to use Jack car work
under certain specifications. Furthermore the torque supplied on the system is more than
enough to lift a car weight around 1200 kg. There are certain weak points that can be improved
based design and balancing of the system.

32. 32
References
1. Edward Lonnon (1992), motorized jack, US5085407A, Feb 4, 1992.
2. Emil Mickael (Feb 24, 2004), Motor Driven Scissor Jack with Limit Switches, US
6695289B1.
3. Leo F. Carder (Aug 2, 2011) Electric Scissor Jack Apparatus, US7988131B1.
4. Noor, M.M., Kadirgama, K., Rahman, M.M., Sani, M.S.M., Rejab, M.R.M.( 2008),
Development of auto car jack using internal car power. Malaysian Science and
Technology Congress, pp. 593-598.
5. S. Akinwonmi and A. Mohammed Modification of the Existing Design of a Car Jack.
6. Bansal, R.K.(2012),” Strength of materials” Revised Edition, LAXMI
PUBLICATION(P) LTD.
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