US1056439A - Lifting-jack. - Google Patents

Description

A. NEAL.

LIPTING JACK.

APPLICATION FILED JULY 5,1912.

Patented Mar. 18, 1913.

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A. NEAL.

LIFTING JACK.

APPLIOATION FILED JULY 5,1912.

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.a1-.BERT NEAL, or" CENTER., INDIANA.

LIFTING-JAOK.

. I speqiacatrionpf Lettersravtent.

To all whom t magico/noem.'

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

`This invention relates toimprovements in lifting jacks for lifting automobiles,l wagons and other heavy -vehicles and loads, for stretching wire, and for all purposes requiring a powerful machine of this general character. y. I

The object of the invention is to provide a jack operated by a single hand lever, and having means whereby the lifting or lowering of a load may be accomplished and controlled by moving the hand lever s. greater or less distance, `but whereby the load will always be within thecontrol of the operator by means of said lever.

I accomplish the objects of my invention by the mechanism illustrated in the accompanying drawings, in whichl y Figure 1 is a longitudinal section on the line 1..-1 of Fig. 2, including the handle socket and its connections which are not shown in Fig. 2. Fi 2 is a section on the ig. 3 is a section similar to Fig. 1 showing the handle in full lineslowered to release the pawl carried by the lever which shows one position of the jack in lowering a load, the hand lever being shown in dotted lines inrits highest position for lowering the load, and Fig. 4 is an elevation of the jack as viewed from the opposite side from that shown-in Fig. 2.

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

drawings.

5 is a hollow standard which extends upwardly from an integral supporting base 6. Formed integral with the standard and proiectin trunnions 7 onwhich a hand lever8' is. ivoted. The arms 9. of the bifurcated en of the handle 8` receive the standard 5 between them, and they are provided with holes to receive the trunnions 7. The trunnions .will preferably be flattened on two opposite sides, as shown by dotted lines in Figs. 1 and 3, and the holes will have extensions to the edges of the arms to permit the arms to be assembled on the trunnions by slipping the latter through said slot extensions 'oblique angle, as shown at 21, the

from two opposite sides thereof areappucmon are@ my 5, 1912. sena; m. 707,813.

Patented Mar. 18,1913.

into the holes.4 The hand .lever 8 has the usual socket 11 to receive l'a wooden handle.

.The standard 5 is provided with' al lon- I gitudinal slot 12 on the opposite side from its handle 8. Mounted withea close sliding vlit inthe hollow standard 5f=is a lifting bar 41 3 having a vlongitudinal rib; 14 which enters the slot 12 of the standard and fills theslot with a close sliding fitffThe lower end ofthe lifting bar hasan extension 15 Which 1s adapted to be brought into engagement with any object to be lifted or stretched `which can be engaged more readily tluereliyv than with the top of the lifting bar. -The lower-end of the 'lifting har isalso reduced in thickness and for-med with an eye 17 for the attachment. of ahook on a rod, chain or the like, when the jack is used for pulling purposes. The opposite end of the liftf ing bar is provided with a head 1 8 suitably shaped to. receive a load.

Formed along` the side of the -lifting bar 13 opposite the -ilange. 14 isa series of notches 19 to be engagedby a pawl ordog 22 carried by the hand lever 8, and by a pawl or dog 23 supported from a bracket extension 25. from the standard 5, and in -order to increase the holding eicienoy or contact between the pawls or do s and the A lifting bar tothe maximum I' pr er to forrn the notches with their outer walls20 at right angles to the` periphery of the lifting bar for a suitable distance and then at. an art 21 being continued into intersection with the oppositely oblique inner wall 2110i the notch, and the notches are continued a little more than half of the circumference of the p lifting bar toward flange 14 where they terminate with end walls 24. This peculiar form of notch provides a secure bea-ring engageine'nt between the pawls and bar, and

the obliqueinner walls 24 act as guides to direct the pawls into the notches. `The outer ends of the pawls 22 and 23 have concave notches to adapt the ends to fit the notches in the lifting bar'13.l Each ofthe do 22' and 23 has holes to receive its pivot en 26, and has slots extending in to the holes from the sides of the pawls to enable the pawls to be placed on and removed from the pins by passing the pins through the said slot extensions. The pins are flattened on two opposite sides to facilitate such assembling. The lower end of the pawl 23 is extended,

and is pressed outwardly by one arm of a spring 28. The other arm of the spring 28 bears against the inner arm of the pawl 22 pressing the latter into contact with the lifting bar. The coiled middle portion of the spring 28 connecting the two arms. is held by pins 29 supported by an extension of bracket 25.

Pivotally supported by the hand lever 8 between the arms 9 of its bifurcated end is a dog 30, the inner end of which contacts with the outer projected end of the pawl 23 when the hand lever is raised Vto the position shown in dotted linesin Fig. 3, and the extension of the pawl is notched as shown at 33, to engage the dog 30 when the hand lef ver is lowered, thereby moving the pawl 23 to' the position shown in dotted lines in Fig. 3, out of engagement with the notched lifting bar 13.

The bracket extension 25 is continued through the space between the arms 9 of the bifurcated hand lever and supports a dog which contacts with the outer end of the pawl 22, in the manner shown in Fig. 3, when the hand lever 8 is in its lowest position the buter end of pawl 22 the said pawl is l vforced out of engagement with the lifting bar 13. The dogs 30 and 35 have stems 37 to contact with portions of the supporting members of said dogs and hold them in,position to be operative with their respective pawls when the hand lever is suitably moved.

Fig. 1 of the drawings shows the hand lever 8 at about the middle of its stroke or movement in elevating the lifting bar 13 the distance of one notch. In this view the lower pawl 22 is carrying the-load and has raised the lifting bar so that the upper pawl 23 is about in position to drop into the next notch below, and when this has occurred by the continued upper lift of the bar 13, the load will be h eld by the pawl 23. leaving the pawl 22 Vfree to be lowered by a downward movement of the hand lever 8 until the pawl 22 enters and engages the lift-ing bar at the notch below, and then by lan upward movement of the hand lever the lifting bar 13 and its load will be raised and held by the upper pawl 23, and this operation will be repeated to the desired extent or until the capacity of the jack has been reached.

To lower the load at any time the hand lever is moved up into the position shown by dotted/lines in Fig. 3, in which position the load willbe supported by the pawl 22, and the pawl 23 will be out of engagement, as shown in dotted lines. The upper pawl 23 will be held out of engagement with the lifting bar by the toggle action between the pawl and dog 30 until the hand lever has been lowered past the position where the do'g 30 first contacted with the pawl and far enough to cause the dog 30 to release said and by engagement with a notch 34 in will then be lowered to the position shown in full lines in Fig. 3 whereupon the pawl 22 will be thrown out of engagement. with the notched lifting bar 13 and locked in that position by the dog 35, and by the swinging of the dog 35 on its pivot pin the pawl 22 will be retained out of engagement with the lifting bar 13 during a considerable upward movement of the hand lever 8, and when the pawl 22 is finally released it will be in a notch higher up than where it was before. By a continued upward movement of the hand lever 8 to the position shown in dotted.

lines in Fig. 3 the upper pawl 23 will be disengaged thereby arresting the load on pawl 22 which will permit it to be lowered in the same manner as above described, and by the continued operation of the lever at its maximum throw each time the dogs 22 andi23 will be manipulated so as to cause the lifting bar 13 to be lowered a notch at a time, until it has been sutliciently lowered or until the capacity of the jack has been reached.

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

What I do desire to secure by Letters Patent, is

1. In a liftin jack, a hollow standard having a pair o? bracket extensions on one side and a pawlopenin between said bracket extensions,.a'nd having trunnions to pivotally hold a hand lever located on two other sides dianietrically opposite each other, a lifting bar in said hollow standard having notches to be en aged by pawls, a hand lever having a bi rca'ted end with holes in the members of the bifurcation to receive said pivot trunnions of the standard, a pawl pivoted to the hand lever in its bifurcate'd end, a pawl pivoted to the bracket extension of the standard, resilient means to force the pawls normally into engagement with the notched lifting bar, means to hold the pawl pivoted to the hand lever out of engagement with the notched standard when the handle is near its lowest position, and means to hold the pawl pivoted to the bracket out of engagement -with the notched standard when the lever is near its highest position.

2. In a lifting jack, a hollow standard having a pair of bracket extensions on one side and a pawlopening between said bracket extensions, and having trunnions to pivotally hold a hand lever located on two other sides diametrically opposite each other, a lifting bar in said hollowstandard having notches to be engaged by pawls, a hand lever having a bifurcated end with holes in the members of the bifurcationto receive said pivot trunnions of the standard a pawl pivoted to the hand lever in its bifurcated end', a pawl pivoted to the bracket extension of the standard, resilient means to force' the pawls normally into engagement with the notched lifting bar7 and Va dogpivoted to the bracket to hold the pawl pivoted to the hand lever out of engagement with the notched lifting bar near the maximum upper move'- `nient of the hand lever and a dog pivoted to 15 ALBERT NEAL. [ne] Witnesses: l i

' J. A; MINTURN,

F. W, WOERNER..

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