US1844585A

US1844585A - High lift jack

Info

Publication number: US1844585A
Application number: US248433A
Authority: US
Inventors: Robert E Manley
Original assignee: Manley Manufacturing Co
Current assignee: Manley Manufacturing Co
Priority date: 1928-01-21
Filing date: 1928-01-21
Publication date: 1932-02-09
Anticipated expiration: 1949-02-09

Description

R. E. MANLEY HIGH LIFT JACK Feb. 9, 1932.

FebJQ, 1932. R. MANLEY 1,844,585

' HIGH LIFT JACK Filed Jan. 21, 928 ZSheets-Sheet 2 ,5 portation.

Patented Feb. 9,, 1932 Mrs!) STATES PATENT orrica ROBERT E. MANLEY, OF YORK, PENNSYLVANIA, ASSIGNOR TO MANL EY MANUFACTUR- ING COMPANY, 01 YORK, PENNSYLVANIA,'A CORPORATION OF. DELA;WABE

HIGH mu: JACK Application filed. Ianaarv 21, 1928. Serial No. 248,439..

The present invention relates to jacks and more particularly to wheeledjacks "adapted for use in garages and the like to lift automobiles for the purpose of repair or trans- The invention has for its object, in eneral, to provide a jackof this character w ich has a very simple and strong construction, designed so that it will not interfere with the movements of workmen in making repairs on the automobile lifted thereby, and which is easy to handle and operate.

To these and other ends, the invention rovides a jack comprising an A-shaped ase suitably supported by wheels or rollers at its diverging and converging ends, the diverging ends of the base being unconnected so as to afford unimpeded movement of the workmen in making repairs on the automobile lifted by the jack and the convergent ends carrying a comparatively massive casting in which the operating parts of the jack are mounted. In this casting a lifting lever of bell crank form is fulcrumed on a transverse axis, the lever having a. short depending arm to which operating forces are ada ted to be applied preferablyv by means 0 a nut and screw, the screw being held from'endwise movement and the nut being operatively connected with the lever arm and guided for axial movement as the screw is rotated, manual means being provided to rotate the screw in either direction The lifting lever comprises a relatively long arm extending longitudinally of the base and havin a liftin head pivoted on its free end, suitable linkage being provided to maintain the head horizontalin all positions of the lever. Due to the arm of the lever being relativel long in comparison to the end to which t e load is applied, small movements of the short arm, to which the operating forces are applied, will elfect comparatively large movements of. the load, and the jack is therefore quick acting, and yet can be easily operated by one man due to the screw and nut drive and the ample leverage provided for the operation of the screw. 7 v v More specific objects and advantages of the invention will appear hereinafter.

Referring to the accompanying draw- 1ngs:--

Fi ure 1 is a side elevation of a jack embodymg the invention; and

Figure 2 is a plan view. I

Figure 3 is an elevation partly in central vertical section.

The jack illustrated comprises a wheeled base including a body casting 10 and apair of divergent arms 11, the latter being connected near their mid points by an angle bar 12, the whole forming a substantially A- shaped base.

Arms 11 are each built up from two steel angles 11a and 11?), the horizontal flange of the one being superposed on the corresponding flange of the other and secured by rivets 13, forming a channel, or box like, structure which is closed at the top and sides and 0 en its ends rigidly secured to theinner sides of arms 11, preferably by welding. The top flanges of angles 11a and 11b are cut away at the ends and the sides of the plates are bent inwardly so as to lie parallel to each other and'to the longitudinal center line of the truck, and mounted ,in the extremities of these webs are pins 14 on which are journaled wheels 15. 7

Casting 10 iscomposed of a horizontal base plate 16, a vertical transverse plate 17 and a pair of vertical longitudinal plates 18, spaced equidistantly from the longitudinal center line of the truck, the whole constituting a massive integral structure of great strength. Base 16 of the casting is bolted to the con verging ends of arms 11 by bolts 19 and 20,

which extend thru the horizontal flanges of 4 pro'ecting portions 23 to the bottoms of whic are olted castings 24 formed with depending bifurcated portions in which are mounte casters 25. A pair of angle pieces 26, having J their vertical flangesjuxtaposed, are secure at one end to the transverse angle bar 12' and at the other end to the under side of base 16. Bolted to the top side of angle irons 26 is a bearing block 27 in which is journaled the reduced end of a shaft 28 formed with a latter being screwed at one end to hearing block 27 and at its other end to the casting base 16. Pivoted on a shaft 34, which is fixed to and extends between'the upper forward corners of the vertical longitudinal plates 18, is a lifting lever formed of a bell crank pivoted on shaft 34 comprising a forwardly extending bar 35 having lateral flanges 36 adj acent the pivot and a depending arm consisting of laterally spaced triangular plates 37 having transversely aligned slots 38 in which are engaged rollers 39 ournaled on studs 40 formed with and projecting laterally from nut 32, the rollers being held from endwise displacement by cotter pins 41. Riveted or otherwise secured to the sides of bar 35 are channels 42 having their ends abutting the front faces of flanges 36, and riveted between the forward ends of these channels is, the shank of a fork member 43, in the fork of which is secured a shaft 44 on which is pivoted a lifting head 45. Head 45 is integral with depending arms 46, and pivoted at'47 to said arms respectively are two drag links 48 which are pivoted at their rear ends at 49 to the vertical plates 18 of the casting, the links being connected at an intermediate point by a transverse pipe spacer 50. Pivot point 49 is vertically below the axis of shaft 34. The distance between 47 and 49 is equal to the distance between 44 and 34, and the distance between 44 and 47 is equal to the distance between 34 and 49. It follows therefore that in all positions of the lifting lever the pivot point 47 will be maintained vertically below the axis of shaft 44, that is, to say, the head 45 will be maintained horizontal in all positions of the lifting lever.

The reduced end of screw shaft 28 pro'ects rearwardly from bearing 30 and has xed thereon a toothed wheel or ratchet 51, and has 'pivoted thereon rearwardly of the ratchet a socket member 52, a collar 53 fixed on the extremity of the shaft preventing endwise displacement of member 52. Socket member 52 carries a forwardly projecting pin 54 on which is pivoted a pawl 55 adapted to engage and operate ratchet 51. Paw-l 55 is formed with a tooth projecting from each side so that it is adapted to operate the ratchet wheel in either direction upon oscillation of the socket member, it bein only necessary o throw the pawl'from one slde to the other to change the direction of operation. The socket member 52 is adapted to receive a tubular operating lever or handle 56, which when held for convenient operation affords a long lever arm for the operation of the screw shaft. A handle 57 is provided to operate the pawl and ratchet to position the lifting head or the saddle. This bar 56 is also adapted for use in propelling the truck by the provision of a fixed socket member '58 which is secured forwardly of socket member 52 on the vertical transverse plate 17 of the casting 10.

To avoid the necessity of operating the lifting lever through a large angle to engage the lifting head 45 with the load (in those cases where the point of initial application of the head to the load is at a considerable elevation) there is provided an auxiliary saddle 59 having a threaded stem 60 which is adapted to screw into a threaded aperture formed axially in the liftin head 45. This auxiliary saddle 59 can be qulckl mounted in head 45 and adjusted to any esired position with respect thereto.

Normally lever 56 is in socket 58 and the jack can be very conveniently wheeled and directed to any desired point by the proper application of moderate forcesto this lever. Where for example it is desired to apply the jack to the lifting of an automobile axle, the ack is wheeled to a position such that the head 45 is under the axis of the automobile. The hand lever 56 is then removed from socket 58 and placed in socket member 52. Pawl 55, if not already in position to cause the operation of screw shaft 28 in a direction to raise the lifting lever, is placed in such position, and the hand lever 56 is oscillated. The oscillation of lever 56 and socket member 52 causes pawl 55 to rotate screw shaft 28 in a direction to move nut 42 forwardly and thereb move the short arm of the lifting lever orwardly and the long arm upwardly causing the head 45 (or the saddle head 59) to engage under the axle and lift the axle. Due to the relatively long lifting arm of the lever and the great leverage exerted by the operator on handle 56 this lifting operation is executed rapidly and without excessive effort. It is to be articularly noted that the divergent arms 0 the base of the jack being unconnected afi'ord ample space for the movements of mechanics in makin necessary inspection and repairs. When it is desired to lower the axle, pawl 55 is thrown over, or reversed and lever 56 is oscillated as before but now causes reverse rotation of the screw shaft and lowering of the lifting lever.

The jack is of very simple construction, having a minimum number of operating parts, and its strength and ruggedness are apparent.

Various changes or modifications can of course ,be made in the s ecific construction described without changmg the essential principles of construction and operation and it is therefore not intended to limit the invention except as set forth or defined in the claims.

I claim:

1. A jack comprisin in combination with a base, a bell crank'li ing lever fulcrumed on the base, having a long arm extending longitudinally of the base and a short downwardly extending arm, a longitudinally extendin screw having fixed spaced journals on the ase, a nut on the screw enga ing said i short arm, and means for rotating t e screw in either direction.

2. A jack comprising in combination with a wheeled base, a bell crank lifting lever fulcrumed on the base on a transverse axis, having a long arm extending longitudinall of the base and a short downwardly exten g arm, a screw journaled on the base beneath the lever fulcrum on a longitudinal axis, a

nut on the screw enga ing the short arm of Y said lever, and means or rotating the screw 1n either-direction.

,3. A jack comprising in combination with a wheeled base,.a bell crank lifting member pivoted on the base having along arm extending longitudinally of the base and a 'short' head downwardly extending arm terminating in a fork, a longitudinally extending screw-journaled on'the base a nut on the screw having a 'laterally'extendin trunion in said fork, a pivoted at the ee end of said long arm,

a lin connecting the head with the base adapted to maintain the head horizontal in all i 7 positions of said bell crank, and manual means for rotating the screw in either direction;

4. A jack comprising in combination with a wheeled base, a bell crank lifting lever fulcrumed on the base havingalong arm extend- A A I ing longitudinall of the base, a lifting head pivoted on the ree end of said longarm,

means connecting said head with the base I adapted to maintainthe head horizontal in all gositions of the lever, a longitudinally exten ing screw mounted on the base in spaced bearings beneath the fulcrum, a nut on the screw engaging'the short arm of the bell crank, and means for rotating the screw in either direction.

5. A jack comprising in combination with A a wheeledbase, a, bell crank liftin lever fulcrumed on the base near one end having a long arm extending longitudinally of the base approximately to the end of the base and a short downwardly extending arm, a 16 itudinally extending screw mounted on e base in bearings on either side of the fulcrum, a not on the screw engaging said short arm,

a socket member pivoted on the axis of the screw, a awl pivoted to said socket member, and a toot ed wheel transmittmg motion from said pawl'to said-screw.

'6. A jack comprising in combination with" 'a wheeled base, a bell crank lifting lever ful-