US3693937A - Load lifting mechanism - Google Patents

Load lifting mechanism Download PDF

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Publication number
US3693937A
US3693937A US2319A US3693937DA US3693937A US 3693937 A US3693937 A US 3693937A US 2319 A US2319 A US 2319A US 3693937D A US3693937D A US 3693937DA US 3693937 A US3693937 A US 3693937A
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US
United States
Prior art keywords
support member
screw shaft
load
load lifting
jack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US2319A
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English (en)
Inventor
Shinichiro Yamazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Application granted granted Critical
Publication of US3693937A publication Critical patent/US3693937A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F5/00—Mobile jacks of the garage type mounted on wheels or rollers
    • B66F5/02—Mobile jacks of the garage type mounted on wheels or rollers with mechanical lifting gear
    • B66F5/025—Mobile jacks of the garage type mounted on wheels or rollers with mechanical lifting gear screw-actuated

Definitions

  • a load lifting jack comprising a support member, a screw shaft rotatably located within the support member, a lifting arm supported at the substantially middle portion by a link and connected at its end to a threaded nut engaged with the screw, the nut being adapted to be displaced along the length of the screw shaft in order to raise or lower the lifting arm, the link being pivotally connected to the lifting arm at one end and having means for engaging the other end with any selected one of a plurality of recesses provided on the support member so that engagement thereof easily and quickly locates the lifting arm in its desired position.
  • a rotatable jack base may be provided for lifting inclined loads to prevent undesired lateral movement of the load lifting jack.
  • This invention relates to load lifting jacks, and more particularly relates to jacks which employ a load lifting arm of the cantilever type.
  • lifting devices of the above generally indicated type which comprise a support member having a ground engaging member, a screw shaft rotatably mounted within the support member, a lever-type lifting arm mounted on a bush engaged with the screw, and a link pivotally connected to the arm at one end and to the ground engaging member at its other end.
  • the engaged bush is displaced along the length of the screw and in consequence the end of the lifting arm is pivoted about its interconnection with the link.
  • This construction is undesirable because it is necessary to raise the lifting arm from its completely collapsed position until the load engaging member of the arm reaches a desired position adjacent the load by continuous manual rotation of the screw, and it is necessary to lower the arm from its lifted position also by continuous manual operation to collapse the device. This requires considerable time and trouble throughout the raising and lowering movement of the arm.
  • FIG. 1 is a side elevation of a jack in its collapsed position embodying the invention
  • FIG. 2 is a view similar to FIG. 1 in its elevated position
  • FIG. 3 is a view in vertical section, taken along the line III-III of FIG. 2;
  • FIG. 4 is a plan view of the structure of FIG. 1;
  • FIG. 5 is a view similar to FIG. 1, but showing a modified form of this invention.
  • FIG. 6 is a view corresponding to FIG. 4 of the structure of FIG. 5.
  • the lifting device comprises generally a support or casing member 10 of upwardly open channel form, and a load lifting arm 12 which carries at one end a load lifting member 14 pivotally connected thereto by a pin 15.
  • the lifting arm 12 which may be formed, for example, of relatively heavy gauge sheet metal is movable between the fully collapsed position (FIG. I) in which the arm occupies a substantially horizontal position and the elevated position in which the arm may be substantially at right angle to the support member 10.
  • An intermediate portion of the lifting arm has an enlarged cross sectional area since it receives the maximum bending moment.
  • a jack base 16 is securely attached by welding, for instance, to one end of the support member 10.
  • the base consists of a bottom member 13 secured to the member and a pair of flanges 17 at opposite sides of the base which are substantially at right angle to the bottom member 13 and are formed integrally therewith.
  • a screw shaft 20 is rotatably mounted within the support member 10.
  • a rotary driving head 22 is fixed at one end of the shaft 20 and outside of the support 10, at which a suitable driving handle (not shown) may be engaged so as to rotate the driving screw 20.
  • a traveler nut 24 is internally screw-threaded and carried on the screw shaft 20 at its other end.
  • the nut 24 includes a pair of cylindrical projections 26 and 28 extending horizontally relative to the screw shaft 20, to act as pivots for a pair of rollers 30 and 32 which are rotatably mounted within the support member 10, respectively.
  • a pair of forks 31 and 35 are provided at the lower end of the lifting arm 12 and formed integrally therewith. The forked portions 31 and 35 are positioned on opposite sides of the driving nut 24 and between the rollers 30 and 32, and are also pivotally mounted on the cylindrical projections 26 and 28, respectively.
  • a thrust bearing 36 is attached on the screw shaft 20 between an end wall 37 of the support 10 and the rotary driving head 22. This bearing receives the leftward thrust on the screw when in use as shown in FIG. 2.
  • a link shaft in the form of a bifurcated member 40 is pivotally mounted at its central portion 42 in a recess 41 provided in the intermediate portion of the lifting arm 12 by supporting plates 44 and 46 secured thereto.
  • a pair of leg portions 48 and 50 at the free ends of the link 40 project outwardly in mutually opposite directions relative to the member 10 and are engageable with any selected one of the notches 18.
  • the legs engage the outer recesses 52 as shown in FIG. 1 or 4.
  • the legs are located at second recesses 54 whereby the load lifting arm 12 is elevated about the projections 26 and 28 as shown in FIG. 2.
  • screw 20 may be rotated in a direction to cause traveler nut 24 to advance to the right in FIG. 2.
  • FIGS. 5 and 6 there is shown a modification with the same parts as shown in the previous embodiment being designated with the same reference numerals with primes affixed thereto.
  • the present invention relates also to a modified lift ing jack which-comprises a support member and the jack base 16'.
  • the support 10' is pivotally mounted at one end on the base 16' by a pivot pin 56 preferably with collars 58 'and 60 so that when the load engaging member 14 is inclined to the horizontal because of.
  • the support member 10 is pivoted about the pin 56.
  • the pin 56 extends across and is supported by the flanges 17' of the base 16'. It is to be noted that unless the support member 10 is pivoted according to the inclination of the vehicle, the support with the jack base will slide along the ground in the horizontal direction.
  • the screw shaft 20' is rotatably mounted within the support l0'-.
  • the rotary driving head'22' of the screw shaft 20'v is mounted at the other end of the casing 10' with the thrust bearing 36'.
  • a bearing member 62 for the driving screw 20' is mounted within one end portion of the support 10' by rivets 64 and 66.
  • the forked ends3land 35 of the load lifting arm 12' are pivotally connected to the projections 26' and 28' of the internally threaded nut 24', which is located on the screw 20' at the opposite end relative to the bearing member 62.
  • a ground engaging member. 68 may be fixed, by
  • each pin Opposed ends of each pin are securely fitted in tubular members 74 and 76, respectively. More particularly, legs 48 and 50 extend inwardly in mutually opposite directions and are rigidly fitted in the tubular member 74, while the stems 42' and 42' of each pin are rigidly mounted in the tubular member 76 and are pivotally connected to the lifting arm 12' at its substantially intermediate portion.
  • the above structure of the link shaft 40' ensures its rigidity and the engagementof the legs48' and 50' and the recesses 18' on the base member 16' in comparison with that of the previous embodiment wherein the leg 48 or 50 may be disengaged in the inward direction.
  • detents or recesses may be provided at one end portion of the support member-in place of providing them on the flanges of jack base.
  • the other endof said link shaft includes leg means and wherein said jack base is provided with a pluralityof recesses spaced along the length thereof for selectively receiving said leg means so that said load engaging member may be raised to. a desired position adjacent the load to be raised before the screw shaft is rotated.
  • a load lifting jack as claimed in claim 2 and further comprising a driving head secured to one end of said screw shaft and extending outside said support 7 member for rotation thereof.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
US2319A 1969-01-17 1970-01-12 Load lifting mechanism Expired - Lifetime US3693937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP463869 1969-01-17

Publications (1)

Publication Number Publication Date
US3693937A true US3693937A (en) 1972-09-26

Family

ID=11589528

Family Applications (1)

Application Number Title Priority Date Filing Date
US2319A Expired - Lifetime US3693937A (en) 1969-01-17 1970-01-12 Load lifting mechanism

Country Status (2)

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US (1) US3693937A (en, 2012)
GB (1) GB1227715A (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923296A (en) * 1974-08-26 1975-12-02 Volvo Ab Device for tilting automobile bodies on automobile body assembly lines
US3938780A (en) * 1974-02-21 1976-02-17 Hauptman Murray L Automobile chassis jack
US5161782A (en) * 1991-12-20 1992-11-10 You Jin Industrial Co., Ltd. Mechanical jack
WO2001072627A1 (de) * 2000-03-27 2001-10-04 Thyssenkrupp Bilstein Gmbh Wagenheber
US20060218724A1 (en) * 2005-04-01 2006-10-05 Jerry Blevins Bed having tiltable section

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720043C2 (de) * 1977-05-04 1983-09-22 Bayerische Motoren Werke AG, 8000 München Wagenheber für ein Kraftfahrzeug, insbesondere für einen Personenkraftwagen
GB2176458B (en) * 1985-05-10 1989-07-05 Metallifacture Ltd Vehicle jack
DE3544779A1 (de) * 1985-12-18 1987-06-19 Ford Werke Ag Wagenheber fuer kraftfahrzeuge
GB2218400B (en) * 1988-05-14 1991-12-11 Metallifacture Ltd Vehicle jack
GB2228249A (en) * 1989-02-16 1990-08-22 Metallifacture Ltd Load-lifting jack.
FR2659312B1 (fr) * 1990-03-08 1992-09-04 Fabrication Accessoires Automo Cric a losange deformable.
GB2481803A (en) * 2010-07-05 2012-01-11 Axeum Ltd Combined air compressor and hose reel for driving a pneumatic jack having a pivotable load engaging attachment device used for leveling a caravan

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1514893A (en) * 1923-04-28 1924-11-11 Anthony E Carlson Jack
US2374409A (en) * 1944-04-21 1945-04-24 Gallagher Ellen Bookstand
US2469048A (en) * 1946-06-24 1949-05-03 Walker Mfg Company Of Wisconsi Lifting mechanism
US2598200A (en) * 1948-06-23 1952-05-27 Walco Inc Hoisting apparatus
GB1082067A (en) * 1965-02-26 1967-09-06 Metallifacture Ltd Improvements in or relating to load lifting jacks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1514893A (en) * 1923-04-28 1924-11-11 Anthony E Carlson Jack
US2374409A (en) * 1944-04-21 1945-04-24 Gallagher Ellen Bookstand
US2469048A (en) * 1946-06-24 1949-05-03 Walker Mfg Company Of Wisconsi Lifting mechanism
US2598200A (en) * 1948-06-23 1952-05-27 Walco Inc Hoisting apparatus
GB1082067A (en) * 1965-02-26 1967-09-06 Metallifacture Ltd Improvements in or relating to load lifting jacks

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938780A (en) * 1974-02-21 1976-02-17 Hauptman Murray L Automobile chassis jack
US3923296A (en) * 1974-08-26 1975-12-02 Volvo Ab Device for tilting automobile bodies on automobile body assembly lines
US5161782A (en) * 1991-12-20 1992-11-10 You Jin Industrial Co., Ltd. Mechanical jack
WO2001072627A1 (de) * 2000-03-27 2001-10-04 Thyssenkrupp Bilstein Gmbh Wagenheber
DE10014767A1 (de) * 2000-03-27 2001-10-18 Krupp Bilstein Gmbh Wagenheber
US20060218724A1 (en) * 2005-04-01 2006-10-05 Jerry Blevins Bed having tiltable section

Also Published As

Publication number Publication date
GB1227715A (en, 2012) 1971-04-07

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