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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.
407:
283:, with the long arm providing the vertical motion to a lifting pad, kept horizontal with a horizontal linkage. Floor jacks usually include casters 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.
356:- instead of human work. This eliminates the need for the user to actuate the hydraulic mechanism, saving effort and potentially increasing speed. Sometimes, such jacks are also able to be operated by the normal hydraulic actuation method, thereby retaining functionality, even if a source of compressed air is not available.
438:
National and international standards have been developed to standardize the safety and performance requirements for jacks and other lifting devices. Selection of the standard is an agreement between the purchaser and the manufacturer, and has some significance in the design of the jack. In the United
372:
An inflatable jack, lifting bag, or pneumatic lifting bag is an air bag that is inflated by compressed air (without a hydraulic component) in order to lift objects. The bag can be deflated to be reused later. The objects can be of a smaller load such as an automobile or it can be a larger object such
258:
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
381:
for high vertical lift in a large surface area but lower lifting capacities. Medium-pressure bags are operated at 15 psi. High-pressure bags which have higher lifting capacities are operated at pressure between 90 and 145 psi. Two air bags can be stacked together to provide a higher lift.
250:
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
414:
The farm jack also known as a railroad jack, high lift jack or kanga-jack was invented in 1905. It consists of a steel beam with a series of equally spaced holes along its length, and a hand-operated mechanism which can be moved from one end of the beam to the other through the use of a pair of
323:
emerges from the body vertically by hydraulic pressure provided by a pump either on the baseplate or at a remote location via a pressure hose. With a single action piston the lift range is somewhat limited, so its use for lifting vehicles is limited to those with a relatively high clearance. For
382:
It is recommended that no more than two bags can be used in a stacked configuration, the bigger bag must be the bottom one, and no other objects are inserted between the stacked bags. Incorrect use of stacked bags may result in a bag (or other objects) shooting out to create a dangerous
439:
States, ASME has developed the Safety
Standard for Portable Automotive Service Equipment, last revised in 2014, including requirements for hydraulic hand jacks, transmission jacks, emergency tire changing jacks, service jacks, fork lift jacks, and other lifting devices.
376:
Air bags are also used by rescuers to lift heavy objects up to help victims who are trapped under those objects. There are three main types of lifting bags for rescue: high pressure, medium pressure and low pressure systems. Low-pressure bags are operated at
92:
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
335:
Bottle jacks have a capacity of up to 50 tons and may be used to lift a variety of objects. Typical uses include the repair of automobiles and house foundations. Larger, heavy-duty models may be known as a barrel jack.
143:
to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for a modern vehicle and the notch fits into a
318:
in shape, having a cylindrical body and a neck. Within is a vertical lifting ram with a support pad of some kind fixed to the top. The jack may be hydraulic or work by screw action. In the hydraulic version, the
331:
spigotted to the body, the bevel gear being turned manually by a jack handle fitting into a square socket. The ram may have a second screwed ram within it, which doubles the lifting range telescopically.
103:
in the sense 'a machine, usually portable, for lifting heavy weights by force acting from below' is from 1679, referring to 'an Engine used for the removing and commodious placing of great Timber.'
64:. The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated for a maximum lifting capacity (for example, 1.5
324:
lifting structures such as houses the hydraulic interconnection of multiple vertical jacks through valves enables the even distribution of forces while enabling close control of the lift.
327:
The screw version of the bottle jack works by turning a large nut running on the threaded vertical ram at the neck of the body. The nut has gear teeth, and is generally turned by a
723:
398:
is a specialized hydraulic jack that grips steel cables. Often used in concert, strand jacks can lift hundreds of tons and are used in engineering and construction.
203:. 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
159:. The electrical energy is used to power these car jacks to raise and lower automatically. Electric jacks require less effort from the motorist for operation.
426:, pulling and pushing. It is this versatility, along with the long travel it offers and its relative portability, which make the farm jack so popular with
415:
climbing pins. Typical sizes for the farm jack are 4 feet (1.2 m), 5 feet (1.5 m)and 6 feet (1.8 m) referring to the length of the beam.
339:
This type of jack is best used for short vertical lifts. Blocks may be used to repeat the operation when a greater amount of elevation is required.
613:
The bottle-jack is exceedingly firm and safe for short vertical lifts, but is not convenient for pushing in a horizontal or oblique direction.
276:
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temporarily supports the structure. This process is repeated until the desired height is reached. The house jack can be used for jacking
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rod is turned with a metal rod. This piece tilts very slightly, but not enough to render the post dangerously out of
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17:
155:
Electrically operated car scissor jacks are powered by 12 volt electricity supplied directly from the car's
156:
766:
247:" – the hydraulic jack, a jack which proved to be vastly superior to the screw jacks in use at the time.
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926:
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An air hydraulic jack is a hydraulic jack that is actuated by compressed air - for example, air from a
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Place the jack under the side sill at the front or rear jack-up point closest to the flat tire.
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84:, which came into English usage around the thirteenth century as a nickname form of
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518:(2019A ed.). Camden, New Jersey: Subaru Corporation. June 2018. pp. 9–7.
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are integral to the scissor jack, one of the simplest kinds of car jack still used.
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A 2.5-ton house jack that stands 24 inches from top to bottom fully threaded out
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The jack's versatility stems from its use for such applications as lifting,
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used to apply great forces or lift heavy loads. A mechanical jack employs a
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In 1838 William Joseph Curtis filed a
British patent for a hydraulic jack.
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152:. Earlier versions have a platform to lift on a vehicle's frame or axle.
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A demonstration of using two stacked air bags to lift the rear of a car
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279:(aka 'trolley jack') a horizontal piston pushes on the short end of a
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533:"Patents for Inventions: Abridgments of Specifications : Class"
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813:
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750:"Safety Standard for Portable Automotive Service Equipment - ASME"
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291:"Bottle jack" redirects here. For the meat-roasting device, see
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This article is about the lifting device. For other uses, see
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or 3 tons). Industrial jacks can be rated for many tons of
65:
609:
Steam power and mill work principles and modern practice
606:
568:
William Cox (July 2001), "Light Talk on Heavy Jacks",
583:
Brian S. Elliott (2006), "Air-Over-Hydraulic Jacks",
251:
is extended. Hydraulic jacks are often used to lift
726:. Windsor Fire & Rescue Services. Archived from
199:that have settled or for installing new structural
60:for lifting heavy equipment. A hydraulic jack uses
1219:
582:
88:, came in the sixteenth century to be used as a
687:"Lifting Bag and Poppet Riveter Repair "Forts""
787:
587:, McGraw-Hill Professional, pp. 56–58,
474:"Different Types of Jacks | Metro Hydraulic"
624:
567:
183:, is a mechanical device primarily used to
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780:
191:. A series of jacks is used and then wood
232:The working principle of a hydraulic jack
546:Dudgeon, Jl Ujb richard (Jan 25, 1859),
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363:
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36:
545:
14:
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629:, Fire Engineering Books, p. 51,
187:from their foundations for repairs or
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243:was granted a patent for a "portable
611:, Whittaker & Co., p. 828,
433:
24:
627:Fire Department Special Operations
600:
359:
255:in low and medium rise buildings.
25:
1239:
760:
607:George William Sutcliffe (1895),
410:A farm jack attached to a vehicle
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214:
767:How to Jack up a Vehicle Safely.
585:Compressed air operations manual
502:Oxford English Dictionary Online
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514:"9: "In Case of Emergency"".
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504:, quoting senses II and 10a.
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314:is a jack which resembles a
157:cigarette lighter receptacle
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7:
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10:
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29:
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96:Oxford English Dictionary
27:Mechanical lifting device
1181:Machine and metalworking
1112:Tongue-and-groove pliers
724:"Pneumatic Lifting Bags"
650:"Detroit Listening Post"
1191:Measuring and alignment
697:(1): 26. January 1944.
660:(4): 44. October 1969.
516:Owner's Manual Outback
478:www.metrohydraulic.com
454:Lift slab construction
411:
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41:Jack which can lift a
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302:Hydraulic bottle jack
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219:Further information:
170:
119:
40:
32:Jack (disambiguation)
1156:Cutting and abrasive
625:John Norman (2009),
133:mechanical advantage
730:on 28 December 2011
221:Hydraulic machinery
837:Adjustable spanner
412:
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348:Air hydraulic jack
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239:In 1851, inventor
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173:
125:
80:The personal name
46:
1228:Lifting equipment
1215:
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1127:Upholstery hammer
691:Popular Mechanics
654:Popular Mechanics
636:978-1-59370-193-2
594:978-0-07-147526-6
570:Old-House Journal
16:(Redirected from
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1002:Pencil sharpener
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434:Safety standards
373:as an airplane.
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52:is a mechanical
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197:carrying beams
185:lift buildings
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1097:Strap wrench
1072:Slide hammer
1067:Sledgehammer
992:Paint roller
951:
877:Caulking gun
847:Basin wrench
744:
732:. Retrieved
728:the original
718:
706:. Retrieved
694:
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681:
669:. Retrieved
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553:, retrieved
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486:. Retrieved
482:the original
477:
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417:
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312:whiskey jack
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129:scissor jack
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112:Scissor jack
100:
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58:screw thread
49:
47:
1206:Woodworking
1062:Screwdriver
1057:Scratch awl
1017:Pipe wrench
867:Breaker bar
852:Block plane
449:Pallet jack
396:strand jack
390:Strand jack
308:bottle jack
287:Bottle jack
43:mobile home
1087:Staple gun
1082:Spike maul
997:Paintbrush
987:Nut driver
982:Multi-tool
962:Lug wrench
942:Hole punch
912:Grease gun
803:Hand tools
555:2016-02-05
488:2016-02-05
460:References
384:projectile
377:7.25
354:compressor
329:bevel gear
277:floor jack
263:Floor jack
189:relocation
181:screw jack
177:house jack
163:House jack
121:Jackscrews
90:colloquial
1107:Tire iron
972:Mitre box
897:Fish tape
872:Cat's paw
824:Workbench
734:6 October
703:0032-4558
666:0032-4558
430:drivers.
402:Farm jack
281:bellcrank
253:elevators
137:leadscrew
107:Jackscrew
76:Etymology
1222:Category
1161:Forestry
1151:Cleaning
1122:Tweezers
932:Headlamp
814:Sawhorse
443:See also
428:off-road
424:clamping
420:winching
193:cribbing
131:use the
1186:Masonry
1176:Kitchen
1037:Plunger
1012:Pincers
937:Hex key
892:Crowbar
887:Crimper
862:Bradawl
819:Toolbox
535:. 1872.
150:unibody
1196:Mining
1166:Garden
1132:Wrench
1022:Pliers
967:Mallet
917:Hammer
902:Gimlet
708:9 June
701:
671:9 June
664:
633:
591:
316:bottle
1201:Power
1047:Punch
882:Clamp
857:Brace
275:In a
209:plumb
201:beams
148:on a
135:of a
1171:Hand
952:Jack
927:Hawk
736:2013
710:2017
699:ISSN
673:2017
662:ISSN
631:ISBN
589:ISBN
572:: 37
139:and
101:jack
86:John
82:Jack
70:load
66:tons
50:jack
658:132
379:psi
310:or
99:of
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695:81
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394:A
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20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
