US958969A

US958969A - Lifting-jack.

Info

Publication number: US958969A
Application number: US51528209A
Authority: US
Inventors: Albert Neal
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-08-30
Filing date: 1909-08-30
Publication date: 1910-05-24
Anticipated expiration: 1927-05-24

Description

NEAL.

LIFTING .MGEn

APPLoATIol- FILED AUG. ao, 1909.

Patmlted May 249 w10.

2 SHEETS-SHEET 1.

lila,

lavan/bg A. NEAL. LEFTNG JACK.

,V APPLIOAflION FILED AUGAO, 1909. 958,969. Patented May 24, 1910i 2 SHEETS-SHEET 2.

ALBERT NEAL, OF CENTER, INDIANA.

LIFTIN Gr- JACK.

Specification of Letters Patent.

Application filed August 30, 1909.

Patented May 24, 1910.

serial No. 515,282.

To all whom it may concern:

Be it known that I, ALBERT NEAL, a citizen of the United States, residing at Center, in the county of Howard and State of Indiana, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to improvements in lifting jacks of simple, compact and powerful construction, of easy adjustment and manipulation, adapted for lifting automobiles, wagons, and other heavy vehicles and loads, and for stretching wire, or for blacksmith purposes, and for lifting heavy rocks, railroad rails, and other heavy articles, the same being adapted for truck, dray, and house-moving purposes.

The object of the invention is to provide a device whereby the operation of a lever under one condition will advance the staff or lifting bar and the operation of said lever under another condition will retract said lifting bar.

Another obj ect of the invention is to provide an arrangement whereby each movement of the lever will advance or retract the lifting bar, as the case may be so that there will be no lost motion in the operation of the lever, and to provide means for easily and quickly adjusting the device to raise or lower the load.

The preferred embodiment of my invention is represented in the accompanying drawings, in which- Figure 1 is a side elevation of my improved jack. Fig. 2 is a vertical sectional elevation on the line 2-2 of Fig. 3. Fig. 3 is an elevation of my device looking in the direction of the arrow 3 of Fig. 1. Fig. 4 is a detail in partial vertical section of my device on somewhat larger scale than same is represented in the previous figures and in which the device is adjusted for lowering the load. In Figs. 1, 2 and 3 the jack is adjusted for raising the load. Fig. 5 is a hori- Zontal section on the line 55 of Fig. 1 on a somewhat larger scale than Fig. 1. Fig. 6 is a section on the line 6-6 of Fig. 5. Fig. 7 is a section on the line 7--7 of Fig. 5, and Fig. 8 is a detail in the same elevation as shown in Fig 3 of the upper body portion of the jack with the dogs and their operating mechanism removed.

Like characters of reference indicate like parts throughout the several views of the drawing.

Referring to the drawings, 10 is the base and 11 the hollow standard or support eX- tending upwardly from said base and preferably integral therewith. Formed near the upper end of the hollow standard 11 through diametrically opposite sides thereof are openings 12, and below these openings on sides of the standard at right angles to those having the openings 12 are the lugs 13. These lugs 13 are rounded at their upper parts to form trunnions or pivots for the support of a rocking head 14. The lugs 13 are elongated below their rounded upper ends for the purpose of securing additional strength to said parts in their function as pivots. The upper end of the hollow standard 11 will preferably be rectangular in cross section, which shape is best adapted to the operations of the associated mechanism, but the lower portion of the standard may be cylindrical in shape as shown. The bore of the hollow standard 11 will preferably be round to receive a staff or lifting bar 1G which is round in cross section, and is provided with a series of annular notches 17 which transform the lifting bar into a rack bar, the notches or teeth of which will be engaged, upon its diametrically opposite sides, by the two dogs or

pawls

18 and 19 pivotally mounted in the rocking head 14. The upper end of the lifting bar 16 is provided with an expanded portion or head 20 having a diametrical groove or notch 21. The notch 21 enables the head 20 to lit the irregular surfaces more satisfactorily than if not so provided, and by making the lifting bar cylindrical it is capable of rotary adjustment in the standard 11 without interfering with the action of the

dogs

18 and 19. The lower end of the lifting bar 16 is cut away on two opposite sides and the resulting flat-sided reduced portion is provided with an eye 22 for the attachment of a cable or hook by means of which the jack may be used for stretching wire or cables or for lifting loads that are below the base 10.

The

dogs

18 and 19 are alike in size and shape and are preferably of the shape shown in the drawings. They are provided with trunnions 25, two for each dog, which enter the notches 2G in the head 14. The head 14 is substantially a rectangular frame which surrounds the squared upper end of the standard 11. Two of its opposite inner walls are grooved upwardly from the bottom at their middles as shown at 27 to receive the rounded lugs 13, and the walls of the grooves are oblique as clearly shown in Fig. 7 to allow' the head to rock on the lugs 13 as pivots. These inner walls of the rocking head are also thickened inwardly as shown at 28 to furnish thickness and strength of material for the formation of notches 26 to receive the trunnions 25 of the pawls. The upper ends of the pawls are extended through the openings 1 2 of the hollow standard, and the pawls or dogs are suitably shaped, as shown, to engage the teeth of the lifting bar 16.

Passing transversely of the rocking head 14 and secured to the under side of said head are the bars 30 which form the bearings for the inner spring arms 31. The arms 31 are integral with coil springs 32 which are wrapped around pins 33 ext-ending inwardly from the side walls of rectangular openings 34 formed through the

dogs

18 and 19 opposite their trunnions 25 and arms 35 of said springs bear against the lower and inner ends of the

dogs

18 and 19 whereby the tension of the springs force the outer ends of said pawls in an outward direction and as a result force the upper' ends of the pawls normally into contact with the notched lifting bar 16. 'Ihe pins 33 for each pawl are separated at their middles to provide a space for the introduction of the loops of the springs through vsaid openings over their respective pins, and preferably each pair of springs are joined at the ends of their arms 31 as shown in Fig. 6 for greater convenience in handling. The lower ends of the dogs or

pawls

18 and 19 are extended below the rocking head 14 to afford engagement for the manual spreading of the pawls to disengage their upper ends from the lifting bar 16 when such disengagement is desirable. 'Ihe head 14 is provided with a socket 38 to receive a hand lef ver 39 for the manual rocking of the head 14.

The construction thus far described provides a device which will be operative for lifting or moving the bar 16 upwardly or away from the standard 11, but the lifting bar 16 cannot be lowered by the operation of the bar 39, and I will now describe the additional parts which render this lowering of the lifting bar possible. The standard 11 is provided with a pair of ears 40, and between them is a rod 41, the lower end of which is screw threaded to receive the threaded eye of a hand lever 42. The inner end of the hand lever 42 has a flange 43 adaptedl to enter a horizontal groove 44 in the standard 11 between the ears 40 and base 10 to lock the rod 41 against longitudinal movement.

Formed integral with the upper end of the rod 41, or rigidly secured to the rod is 'a lateral yoke 45 having upward end extensions 46 which are seated in channels 47 formed in the outer walls of the standard 11. These upward extensions 46 terminate with heads 48. Between the yoke 45 and ears 40, surrounding the rod 41 is a spring 50 which presses the yoke normally away from the ears thereby moving the head 48 toward the upper end of the standard 11. The dogs or

pawls

18 and 19 are each provided with an inner lug 52 which, when theheads 48 are at their maximum elevation will contact on the downward travel ofsaid lugs 52 by the rocking of head 14, with a respective one of said heads 48. When this contact between lug 52 and head 48 occurs the dog will be rotated on its pivot causing its upper end to swing outwardly out of engagement with the lifting bar 16. The load supported by the bar 16 is then resting upon the other dog on t-he opposite side of the jack, Contact between lug 52 and head 48 occurs before the pawl which is affected by such contact has reached the limit of its downward travel and the completion of this travel is permitted by the downward yielding of head 48 due to the retraction of spring 50V which supports it through yoke V45 and extension 46. The load, during the downward movement of this pawl is supported by its mate and will be lowered by a reverse movement o f the rocking head. The resilient action of the head 48'continues to hold the first pawl out of contact with the lifting bar 16 until the bar has been lowered by the said reverse movement of the rocking head suiiciently to cause the disengaged pawl to miss t-he notch on said bar in which it was last seated, but it is released in time to engage the next higher notch and support the load while the pawl which had just been supporting it becomes disengaged from the lifting bar by the contact of its lug 52 with the head 48 on its side of the machine. The above described operations are repeated and the load is thus lowered by the same movement of the hand lever 39 by which it was originally raised. IVhen it is desired to raise a load the heads 48 are drawn down out of the paths of lugs 52 by lowering the handle 42 and are there locked by engagement of lug 43 in channel 44.

lVhile I have shown and described the preferred embodiment of my invention it will be understood that I do 4not wish to be limited to the precise construction herein set forth, since various changes in the form, proportion, and minor details of construction may be resorted to without departing from the principle or Vsacrificing any of the advantages of this invention. l V

' Having thus fully' described my nsaid invention what I claim as new and wish to secure by Letters Patent of the United States,

1. In a lifting jack, a hollow standard having a squared upper end with pawlespee openings through two opposite sides and pivot-lugs on the other two sides, a liftingbar mounted in said hollow standard said bar having a plurality of notches to be engaged by pawls, a rocking-head substantially in the form of a rectangular frame to receive the squared end of the standard and having notches to receive the pivot-lugs of the standard, said head having a handle and pivot recesses in its inner wall for the attachment of pawls, pawls in said head having trunnions seated in the pivot recesses of the head, the upper ends of said pawls passing through the paWl-openings of the standard and engaging in notches of the lifting-bar, and springs mounted in and carried by the pawls for moving the pawls into contact with the lifting-bar.

2. In a lifting jack, a hollow standard having a squared upper end with pawlopenings through two opposite sides and pivot-lugs on the other two sides, a liftingbar round in cross section having a reciprocating travel in said standard said bar having a plurality of annular grooves to engage pawls, a rocking-head substantially in the form of a rectangular frame to receive the squared end of the hollow standard, said frame having underside notches to receive the pivot-lugs of the standard, said head having a handle and also pivot recesses in its inner wall for the attachment of pawls, a pair of pawls one on each side of the standard mounted in said head and having trunnions seated in the pivot recesses of the head, the upper ends of the pawls passing through the openings in the standard into contact with the grooved lifting-bar, said pawls having transverse openings with inwardly projecting pins in said openings, and springs secured to said pins and having one arm bearing against the lower end of the pawl and another arm bearing against a fixed portion of the head.

3. In a lifting jack, a hollow standard, a lifting-bar mounted in said hollow standard having a plurality of notches to be engaged by pawls, a rocking-head substantially in the form of a rectangular frame surrounding the standard, said frame having a handle for the manual rocking of the frame, pawls pivotally mounted within said head, one on each side of the standard, the upper ends of said pawls engaging notches of the lifting-bar said pawls each having an inwardly projecting lug, springs for moving the pawls into contact with the lifting-bar, adjustable trips arranged to be moved into contact with the lugs on the pawls to alternately move the pawls out of engagement with the rack and reverse the travel of the rack comprising a yoke with upward eX- tensions terminating in trip-heads, a spring to press the yoke toward the pawls, and a fastening to lock the trips in their adjustments out of the paths of the pawl-lugs.

4:. In a lifting jack, a hollow standard having a notch near its base, a lifting bar provided with notches and slidably mounted in the standard, a rocking-head substantially in the form of a rectangular frame surrounding the standard, said frame having a handle for the manual rocking of the frame, pawls pivotally mounted within said head, one on each side of the standard, the upper ends of said pawls engaging notches of the lifting-bar said pawls each having an inwardly projecting lug, springs for moving the pawls into contact with the lifting-bar, adjustable trips arranged t0 be moved into contact with the lugs on the pawls to alternately move the pawls out of engagement with the rack and reverse the travel of the rack comprising a rod having a lateral yoke with upward extensions terminating in trip-heads, a spring to press the yoke toward the pawls, and a hand lever pivoted to the lower end of the rod and having a flange arranged to be engaged with the notch near the base of the standard to lock the trip-heads out of the paths of the pavvl-lugs.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this 12th day of August, A. D. one thousand nine hundred and nine.

ALBERT NEAL. [1.. s]

Witnesses:

F.' W. WOERNER, L. B. WOERNER.