A jack is mechanical device used to lift heavy loads or apply great forces. Jacks employ a screw thread or hydraulic cylinder to apply very high linear forces.
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.
Scissor jacks are simple mechanisms used to drive large loads short distances.Anadrol before and after
The power screw design of a 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.
A scissor jack is operated simply by turning a small crank that is inserted into one end of the scissor jack. The end fits into a ring hole mounted on the end of the screw, which is the object of force on the scissor jack.
When this crank is turned, the screw turns, and this raises the jack. The screw acts like a gear mechanism.
It has teeth the screw threadwhich turn and move the two arms, producing work. Just by turning this screw thread, the scissor jack can lift a vehicle that is several thousand pounds. Power screw in a scissor jack is the foundation of whole mechanism of scissor jack. The most common problem encountered while using scissor jack is the instability of jack while giving jerks to loosen the wheel nut. Also the common jack having small base is unable to provide proper support on uneven surface esp.
The project relates to the designing of simple scissor jack and its analysis along with structural improvements to make such a modified jack that is very stable and can take enough load on uneven surfaces and somewhat inclination is also allowed. The project also aims at designing and finding stresses, efficiency, expected life of screw.Works fine, but once downloaded the edited file there was a stamp on all the pages. The search for an actually free PDF edit app continues. This is just a demo.
There is nothing in the description that indicates this, and I don't like being tricked into installing demoware onto my machine. Be warned if you plan on overwriting your original document.
Only thing I would change is having the sheets automatically preview in the rearrange section. Otherwise I am getting a lot of use out of this app. Watermarks makes this useless. Not free as stated.
Lots of free apps out there to choose from -- don't bother with this one. It does not say anywhere in description that it is a Demo! Translate to English.Sense of entitlement
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Skip to main content. PDF Jack Free. Wish list. See System Requirements. Available on PC. People also like. Scan Archive Rated 2.The 48 Laws Of Power Robert Greene Audiobook
Fast OCR Rated 3. What's new in this version version 7. Features Merge PDF not just tens or hundreds but even thousands of pages with ease! Additional information Published by kaeros.Seeing as this site is focused mainly on Jacks, I thought it would be a good idea to discuss different types of Jacks on the market in an attempt to clear up any misunderstanding or confusion you may have when it comes to deciding which one you need.
Its easy to see why consumer can become confused when trying to choose the best jack for their needs, there are over 8 different types of Jacks! For our purposes there are 5 main types of vehicle Jacks. A scissor jack is perhaps the most common type of jack you may have encountered as these jacks come with your car! They are usually in close proximity to your cars spare tire and are used mainly for roadside repairs, in the main to change a flat tire.
These days there are even electrically operated scissor jacks available that run off your vehicles battery.Xxe base64 java
This makes jacking your car up to change a tire a very simple process. They usual come in a neat carry case like the one below. Hydraulic Jacks often referred to as a floor jack, garage jack, trolley jack or service jack. This is mainly due to the large weight and size of these jacks. Floor jacks are operated by wheeling and sliding the jack under the car these jacks have wheels and coasters, so they are very easy to maneuver.
You do need to ensure the ground is as flat and hard as possible. This pumping action sucks oil out of the jacks oil reservoir and forces it into the lift chamber, creating an increase in oil pressure and resulting in the saddle arm of the jack rising and lifting your car.
These jacks are far superior to scissor jacks for a workshop or garage setting as they take much more punishment, wear and tear and rarely if ever fail, even after decades of use! To learn more about hydraulic floor jacks visit the link here. Another type of hydraulic jack that you may be familiar with is the bottle or whiskey jack. So named as its physical appearance resembles an old fashioned whiskey jug or bottle. Rather than have a lift arm as a trolley jack does, the bottle jack has a single lift rod, which acts as a piston.
Its a very simple mechanism, you simply pump the arm of the jack and the piston will rise. They have a whopping 50 tons lift capacity and are often deployed in the act of raising houses in a chained group of jacks.
When using on a vehicle many people like to use a block of timber to help cushion the impact on the cars body of the relatively small in comparison to a floor jack saddle point of impact. One major drawback with the bottle jack is its height its collapsed height is usual only half that of its extended height, this means its unsuitable for many regular vehicles, but is ideal for vehicles with higher clearances, such as trucks and 4wds.A jack is a mechanical lifting device used to apply great forces or lift heavy loads.
A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. Jacks are usually rated for a maximum lifting capacity for example, 1. Industrial jacks can be rated for many tons of load. The personal name Jackwhich came into English usage around the thirteenth century as a nickname form of Johncame in the sixteenth century to be used as a colloquial word for 'a man of low status ' much as in the modern usage 'jack of all trades, master of none'.
From here, the word was 'applied to things which in some way take the place of a lad or man, or save human labour'. The first attestation in the Oxford English Dictionary of jack in the sense 'a machine, usually portable, for lifting heavy weights by force acting from below' is fromreferring to 'an Engine used for the removing and commodious placing of great Timber.
Scissor car jacks usually use mechanical advantage to allow a human to lift a vehicle by manual force alone. The jack shown at the right is made for a modern vehicle and the notch fits into a jack-up point  on a unibody.
Earlier versions have a platform to lift on a vehicle's frame or axle.
Different Types of Jacks
Electrically operated car scissor jacks are powered by 12 volt electricity supplied directly from the car's cigarette lighter receptacle. The electrical energy is used to power these car jacks to raise and lower automatically.Ya latif 16641
Electric jacks require less effort from the motorist for operation. A house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. A series of jacks is used and then wood cribbing temporarily supports the structure.
This process is repeated until the desired height is reached. The house jack can be used for jacking carrying beams that have settled or for installing new structural beams. On the top of the jack is a cast iron circular pad that the jacking post rests on. This pad moves independently of the house jack so that it does not turn as the acme-threaded rod is turned with a metal rod.
This piece tilts very slightly, but not enough to render the post dangerously out of plumb. In William Joseph Curtis filed a British patent for a hydraulic jack.
Ininventor Richard Dudgeon was granted a patent for a "portable hydraulic press " - the hydraulic jack, a jack which proved to be vastly superior to the screw jacks in use at the time. Hydraulic jacks are typically used for shop work, rather than as an emergency jack to be carried with the vehicle. Use of jacks not designed for a specific vehicle requires more than the usual care in selecting ground conditions, the jacking point on a vehicle, and to ensure stability when the jack is extended.
Hydraulic jacks are often used to lift elevators in low and medium rise buildings. A hydraulic jack uses a liquid, which is incompressible, that is forced into a cylinder by a pump plunger. Oil is used since it is self lubricating and stable. When the plunger pulls back, it draws oil out of the reservoir through a suction check valve into the pump chamber.
When the plunger moves forward, it pushes the oil through a discharge check valve into the cylinder. The suction valve ball is within the chamber and opens with each draw of the plunger. The discharge valve ball is outside the chamber and opens when the oil is pushed into the cylinder. At this point the suction ball within the chamber is forced shut and oil pressure builds in the cylinder. In a floor jack aka 'trolley jack' a horizontal piston pushes on the short end of a bellcrankwith the long arm providing the vertical motion to a lifting pad, kept horizontal with a horizontal linkage.
Floor jacks usually include castors and wheels, allowing compensation for the arc taken by the lifting pad. This mechanism provides a low profile when collapsed, for easy maneuvering underneath the vehicle, while allowing considerable extension. A bottle jack or whiskey jack  is a jack which resembles a bottle in shape, having a cylindrical body and a neck.The audio jacks was invented in the 19th century for the purpose of use in telephone switchboards and still used widely to transfer analog audio signals.
Now-a-days 3. Also, for hobbyists 3. There are different types of 3. These types of audio jacks does not support stereo sound and microphone, which means there is no left and right.
DESIGN AND ANALYSIS OF SCISSOR JACK FULL REPORT Download-Mechanical Project
You will get same sound from both the sides. Below is the pinout of TS type male audio jack.
Application: Still used on musical equipment especially in electric guitars and aviation radios. Below is the pinout of TRS type male audio jack. A TRRS type audio jack have four conductors and are most popular with smartphones and tablets. Application: Used in many branded companies headphones like Apple, Nokia, Samsung, Panasonic and etc.
For using a 3. Remove the above plastic casing and you will see the pins of the jack as shown in the images above. Now use multi-strand wires to solder with the pins and then again cover it with the Plastic casing.
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Stewart Connector's SS series jacks are ideal in 2. Pin Configuration Pin No. Pin Name Description 1. Tip Left 2. Ring Right 3.Ratiba ya simba round ya pili 2020
Ring Ground 4. Types of 3. TS Type Male Audio jack These types of audio jacks does not support stereo sound and microphone, which means there is no left and right.
Application: Speakers, microphone, keyboards and etc. How to Use a Audio jack? Component Datasheet. Tags Audio. Get Our Weekly Newsletter!
Littelfuse F Series Fuse. Amphenol Millimeter Wave Interconnects. Amphenol SV Microwave features their high-frequency millimeter wave coaxial connectors.To browse Academia. Skip to main content. Log In Sign Up. Hydraulic Bottle Jack Design. We also appreciate his consideration and understanding towards our effort. Lastly, I wish to appreciate the encouragement and sympathetic by families for the duration of every part of my enjoyable and dreadful moment.
We would like to acknowledge first our classmate students those help us by sharing designing material like text book and soft copy, and those who share idea with us for what we are going to do. Oriaethiopia1 gmail. Car jacks are available at the market has some disadvantages such as requiring more energy to operate, are not suitable for women and cannot be used on the uneven surface.
The purpose of this project is to modify the design of the existing car jack in terms of its functionality and also human factors considerations. In this project, the scopes of research were on the designing 1. To optimize the existing design, the hand lifter has been replaced by the use of pedal lever as it can reduce energy usage. In the process of obtaining a suitable design, the customer needs will be translating to the engineering characteristic to obtain the concepts that need to be modified and fabricated.
From the house of quality, the best concept will be valued based on the weighted rating method. The morphology chart had been used to obtain the best concept solution. After the best concept had been selected using the weighted rating method, next step was to determine the part and component that can be modified by arrange the part into chunks and clustering with the component according to the function or system.
From this step, it can be determined which component can be reduced or modified. Then the configuration design was analyzed. According the function factor and critical issue so that the design that had been implementing was according to the specification and customer requirement.
The last step for this project was parametric design. In this topic, the new design concept will be calculated to obtain the required force and compared with the theoretical calculation in the table of human factor. Bookmark not defined. The most common forms of jacks available in the market are Scissor car jacks, House jacks, Hydraulic jacks, Pneumatic jacks and Strand jacks that are extensively used in Construction, Industrial, Automobile and Engineering segments.
In most of the powerful jacks, hydraulic power is14 Used to provide more lift over greater distances. Mechanical jacks usually have lifting capacity ranging from 1. Hydraulic jacks are mechanical devices used to lift heavy loads, vehicles, weight equipment or apply great forces using hydraulic fluid as the main source of power.
These are widely used in automotive, industrial and construction industries. These are sturdy in construction, compact in size, portable and capable of exerting great forces. It consists of two cylinders of different sizes which are connected together by a pipe and a hydraulic fluid or oil. The hydraulic fluid is incompressible and using a pump plunger is forced into the cylinder of the jack.
Oil is used because of its stable and self-lubricating nature. When the plunger pulls back, oil is drawn out of the reservoir and it goes inside the pump chamber. When the plunger moves forward, the oil is pushed back into the cylinder.Almost everyone has changed a tire at some point in their life. While a spare tire is acknowledged as a necessity, the second most important tool for the job is a jack.
Without it there is no way to lift the vehicle off the ground. Jacks and jack stands are not just for changing a tire. They can also convert any space into an automotive workshop in no time at all, making it possible for users and mechanics to perform maintenance and vehicle repairs right in your own driveway. Jacks and jack stands are extremely safe and reliable as long as they are used correctly and the correct jack and stand is used for the vehicle weight.
A vehicle jack uses the power of hydraulics to lift up part of a car allowing the user access to change a tire or perform repairs or maintenance. Jacks come in a variety of types and weight ratings. Choosing the right kind of jack for the work being performed is key, not only for the safety of the mechanic, but the vehicle as well. Almost every new vehicle sold comes with a jack as a standard tool for changing a tire. While these jacks are certainly up to the task of lifting the vehicle a few inches off the ground to change a tire, for more in-depth work a second jack or jack stands are required.
It is always wise to be cautious when using a jack. If the vehicle to be lifted weighs 2 tons, use a jack that is rated for at least 2. Never use a jack on a vehicle that is over its rated capacity. Jack stands are tower or tripod shaped and are designed to support the weight of a raised vehicle.
They should be placed under the vehicle axle or frame to provide additional support for an elevated car. Once a vehicle is jacked up the stands are put in place and the vehicle is lowered onto the stands. There are saddle shaped tops on jack stands, which are designed to support the vehicle axle.
Stands should only be used on hard and level surfaces and only for the vehicles that are within the weight capacity of the stands. Jack stands are available in different types and are categorized by maximum height and weight capacity. In most cases, the height of a jack stand is expressed in inches and the weight capacity is in tons.
Jack stands are usually sold in pairs and are most commonly used with floor jacks. Stand heights typically range from 13 to 25 inches but can range all the way up to 6 feet. Weight capacity can go from 2 tons up to 25 tons. Jack stands are mainly used for repairs or maintenance, they are not commonly used to change a tire.
A floor jack is the most common type of jack used for maintenance and repairs. They are easy to move around and position in the exact spot that needs to be lifted. A floor jack consists of a low to the ground unit with four wheels and a long handle that the user pumps to operate the hydraulic lift portion of the jack. The jack saddle is a round disk that makes contact with the vehicle. The low profile of the base unit allows it to be easily maneuvered.
The handle must be turned clockwise which closes the valve before pumping the handle to raise the jack. The handle is turned counter clockwise to open the valve and lower the jack saddle.
Floor jacks are the workhorses of the jack community and they are extremely helpful when performing work that requires the mechanic to get underneath the vehicle. A scissor jack is the type of jack that most people have in the trunk of their car. It uses a screw mechanism to produce the lifting power.
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