US3550907A - Vehicle-lifting jacks - Google Patents

Vehicle-lifting jacks Download PDF

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Publication number
US3550907A
US3550907A US688114A US3550907DA US3550907A US 3550907 A US3550907 A US 3550907A US 688114 A US688114 A US 688114A US 3550907D A US3550907D A US 3550907DA US 3550907 A US3550907 A US 3550907A
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column
roller
jack
carriage
vehicle
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US688114A
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Alexander Hahn
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    • 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
    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • 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
    • B66F2700/00—Lifting apparatus
    • B66F2700/09—Other lifting devices

Definitions

  • the invention relates to vehicle lifting jacks of the type comprising an upright column of constant cross section, a carriage arranged to move up and down column, and a drive roller engaging the column.
  • Known jacks of this type have a column with rack teeth with which the roller, which is provided with spur gear teeth, meshes.
  • the roller or geared wheel is provided with a pawl to prevent it running backwards.
  • One object of the present invention is to avoid the disadvantages of prior-art jacks. i
  • Another object of the present invention is to provide a jack which is simple and cheap to produce.
  • a still further object of the invention is to provide a jack which can be used continuously for raising and lifting loads and is reliable in use.
  • a vehicle-lifting jack comprising an upright column, a carriage arranged for running up and down the column, a drive roller which is retained in position by the carriage and is arranged to rotate about a substantially horizontal axis, the carriage having oblique faces so as to press the roller against the column, projections on the peripheryof the roller which are harder than the column and adapted to bite into it when the jack is under load and the roller is turned and form-corresponding recesses with which the projections can mesh in later use.
  • FIG. 1 shows a vertical section and side view of the jack in accordance with the invention.
  • FIG. 2 shows a horizontal section on the line II-Il in accordance with FIG. 1.
  • the jack comprises a bottom plate la on which there is welded an upright column 1 which is in the form of a metal bar such as a rolled or extruded T-section girder.
  • a carriage or slide 2 suitably adapted to correspond to the column 1 moves up and down it.
  • the carriage 2 has two oppositely placed walls which project beyond the column to the side and has openings or windows 2a with oblique running surfaces 3a which are parallel to each other and in an upward direction run towards the column.
  • the carriage carries a drive roller 4 in the form of a pin on which two guide collars 4a and 4b are arranged at such a distance apart, see FIG. 2, that they lie against the sides of the transverse web of the column so that the movement of the roller or pin along its axis is prevented.
  • An end of the roller projecting out of the carriage 2 carries an eye 5 into which a Tommy bar or a crank can be fitted for manual turning of the roller.
  • the roller or pin has smooth end journals 6 and 6a which run against the oblique surfaces 3.
  • the roller In the central section between the collars 4a, 4b the roller has helical teeth 9 which bite into the column 1 when the drive roller is turned under load. Instead of having teeth as shown, the roller can be knurled.
  • the toothed. surface of the roller is made harder than the part of the column it is to engage.
  • the carriage For raising the load the carriage carries an abutment 8 which engages a specially provided abutment on ,the vehicle to be lifted.
  • a vehicle-lifting jack comprising an upright column, a carriage arranged for running up and down the column, a drive roller which is retained in position by the carriage and is arranged to rotate about a substantially horizontal axis, the carriage having oblique faces so as to press the roller against the column, the column being formed of a material having a first hardness, projections on the periphery of the roller which are formed of a material which is hard-er than the material of which the column is formed, and which projections are adapted to bite into the column when the jack is under load and the roller is turned, and the projections-form corresponding recesses in the column with which the projections can mesh in later use, and a spring connected with the carriage and pressing the roller in an upper direction against the column to ensure a positive and continuous interengagement between the projections and the meshing recesses formed on the column.
  • a jack according to claim I including locking means for locking the carriage in position along the column.

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  • 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)
  • Accessories And Tools For Shearing Machines (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Description

United States Patent Alexander Hahn 1, Waldhohlweg, Schneidhain, uber Konigstein (Taunus), Germany Appl. No. 688,114 1 Filed Dec. 5,1967
Inventor Patented Dec. 29, 1970 Priority Dec. 5, 1966 Germany No. 1162010 VEHlCLE-LIFIING JACKS 3 Claims, 2 Drawing Figs.
US. Cl... 254/1 Int. Cl B661" 3/02 Field of Search 25 4/1 95; 248/125, 412; 24/1262, 263SW, 263.5RB; 269/ 1 66, 217
[56] References Cited UNITED STATES PATENTS 2,595,008 4/1952 Sill 24/126.2UX FOREIGN PATENTS 1,941,462 6/1966 Germany t 254/1 18,007 12/1887 Great Britain, 248/125 Primary Examinen-Theron E. Condon Assistant Examiner-David R. Melton Atmrhey-Ostrolenk. F aber. Gerb and Soffen ABSTRACT: The specification describes an improved vehicle jack having a pinion with sharp teeth arranged to bite into a stationary upright part of the jack and thus save machining teeth in the upright part.
' PATENTEU nEczslg m Fig. 2
VEHICLE-LI FIIN G J ACKS The invention relates to vehicle lifting jacks of the type comprising an upright column of constant cross section, a carriage arranged to move up and down column, and a drive roller engaging the column.
Known jacks of this type have a column with rack teeth with which the roller, which is provided with spur gear teeth, meshes. The roller or geared wheel is provided with a pawl to prevent it running backwards.
Such known forms of jack with a rack drive have the disadvantage that the conjugate gear wheel and rack teeth have to be made with a relatively high degree of precision and are therefore expensive. Furthermore good lubrication is necessary.
One object of the present invention is to avoid the disadvantages of prior-art jacks. i
Another object of the present invention is to provide a jack which is simple and cheap to produce.
A still further object of the invention is to provide a jack which can be used continuously for raising and lifting loads and is reliable in use.
With these and other objects in view the present invention provides a vehicle-lifting jack comprising an upright column, a carriage arranged for running up and down the column, a drive roller which is retained in position by the carriage and is arranged to rotate about a substantially horizontal axis, the carriage having oblique faces so as to press the roller against the column, projections on the peripheryof the roller which are harder than the column and adapted to bite into it when the jack is under load and the roller is turned and form-corresponding recesses with which the projections can mesh in later use.
Owing to the use of the projections which are harder than i the column, machining of the column to produce meshing recesses and teeth is not necessary. Despite the simplicity of construction reliable operation is ensured since the higher the load which the jack has to support the greater the pressure between the cooperating surfaces of the roller and the column and therefore the firmer the engagement.
One embodiment of the invention is nowdescribed with reference to the accompanying drawing.
FIG. 1 shows a vertical section and side view of the jack in accordance with the invention.
FIG. 2 shows a horizontal section on the line II-Il in accordance with FIG. 1.
The jack comprises a bottom plate la on which there is welded an upright column 1 which is in the form of a metal bar such as a rolled or extruded T-section girder. A carriage or slide 2, suitably adapted to correspond to the column 1 moves up and down it. The carriage 2 has two oppositely placed walls which project beyond the column to the side and has openings or windows 2a with oblique running surfaces 3a which are parallel to each other and in an upward direction run towards the column. In these openings 2a the carriage carries a drive roller 4 in the form of a pin on which two guide collars 4a and 4b are arranged at such a distance apart, see FIG. 2, that they lie against the sides of the transverse web of the column so that the movement of the roller or pin along its axis is prevented.
An end of the roller projecting out of the carriage 2 carries an eye 5 into which a Tommy bar or a crank can be fitted for manual turning of the roller. The roller or pin has smooth end journals 6 and 6a which run against the oblique surfaces 3. In the central section between the collars 4a, 4b the roller has helical teeth 9 which bite into the column 1 when the drive roller is turned under load. Instead of having teeth as shown, the roller can be knurled. The toothed. surface of the roller is made harder than the part of the column it is to engage. For raising the load the carriage carries an abutment 8 which engages a specially provided abutment on ,the vehicle to be lifted.
Owing to the fact that the first time the jack is used the teeth 9 bite corresponding recesses in the column 1, a positive engafiement is obtained which prevents an sliding of the drive ro er along the column. The angle the ob ique faces'3 make to the column is so chosen that the jack is self-locking owing to the friction created. The frictional locking effect between the journals 6a, 6b of the roller 4 and the oblique faces 3 of the carriage is overcome as soon as the roller is turned in the lifting direction or in the lowering direction, but becomes immediately effective again as soon as the manually applied torque is released. The roller 4 is continuously pressed upwards by a spring 7.
Iclaim:
1. A vehicle-lifting jack comprising an upright column, a carriage arranged for running up and down the column, a drive roller which is retained in position by the carriage and is arranged to rotate about a substantially horizontal axis, the carriage having oblique faces so as to press the roller against the column, the column being formed of a material having a first hardness, projections on the periphery of the roller which are formed of a material which is hard-er than the material of which the column is formed, and which projections are adapted to bite into the column when the jack is under load and the roller is turned, and the projections-form corresponding recesses in the column with which the projections can mesh in later use, and a spring connected with the carriage and pressing the roller in an upper direction against the column to ensure a positive and continuous interengagement between the projections and the meshing recesses formed on the column.
2. A jack according to claim 1 in which the column is a piece of T-section girder.
3. A jack according to claim I including locking means for locking the carriage in position along the column.
US688114A 1966-12-05 1967-12-05 Vehicle-lifting jacks Expired - Lifetime US3550907A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH62010A DE1258572B (en) 1966-12-05 1966-12-05 Lifting device designed as a jack

Publications (1)

Publication Number Publication Date
US3550907A true US3550907A (en) 1970-12-29

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US688114A Expired - Lifetime US3550907A (en) 1966-12-05 1967-12-05 Vehicle-lifting jacks

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US (1) US3550907A (en)
AT (1) AT279384B (en)
BE (1) BE707570A (en)
CH (1) CH455202A (en)
DE (1) DE1258572B (en)
ES (1) ES347926A1 (en)
FR (1) FR1546307A (en)
GB (1) GB1131599A (en)
LU (1) LU55011A1 (en)
NL (1) NL160226C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2081646B1 (en) * 1970-03-03 1976-06-11 Braselmann Ferd
DE2409012C2 (en) * 1974-02-25 1983-05-05 Banach, Dieter, 5251 Hohkeppel Winch support
AT410126B (en) * 1996-08-16 2003-02-25 Friedrich Mag Ing Blaha adjustment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB814184A (en) * 1956-05-14 1959-06-03 Hahn Alexander Improvements relating to adjustable supports or props
DE1941462U (en) * 1966-03-09 1966-06-30 Alexander Dipl Ing Hahn JACK FOR VEHICLES WITH MANUAL DRIVE.

Also Published As

Publication number Publication date
ES347926A1 (en) 1969-02-16
LU55011A1 (en) 1968-02-27
BE707570A (en) 1968-04-16
FR1546307A (en) 1968-11-15
CH455202A (en) 1968-06-28
NL160226B (en) 1979-05-15
DE1258572B (en) 1968-01-11
AT279384B (en) 1970-03-10
NL160226C (en) 1979-10-15
NL6716465A (en) 1968-06-06
GB1131599A (en) 1968-10-23

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