US695316A - Lifting-jack. - Google Patents

Description

Patented Mar. ll, I902.

J. H. KOONS.

LIFTING JACK.

Application filed Dec. 31, 1901.)

(No Model.)

Ill

UNTTEE @TaTEs PATENT @EETEE.

"JOHN II. KOONS, OF \VAYNESBORO, PENNSYLVANIA.

LlFTlNG-JACK.

srnolrmarron forming 132M, ofLetter-s Patent No. 695,316, dated March 1 1, 1902,

Application filed December 31, 1901. $erial No. 87,859. No model.)

To all whom, it may concern-.-

Be it known that 1, JOHN H. KOONS, of WVaynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Lifting- Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appcrtains to make and use the same.

The object of this invention is to provide a simple and inexpensive collapsible form of lifting-jack which when not in use may be easily folded to occupy but little room and one wherein the jack-lever may be held at different points as against slipping and easily returned to its lowermost or starting position ready for reuse.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation. Fig. 2 is a detail View of the ratchet. Fig. 3 is a section on line 3 3, Fig. 2. Fig. 4 is an end view of the jack, showing the lever and one of its supporting-legs.

Referring to the drawings, 1 1 designate two legs constituting a support; 2, the lifting-lever, fulcrumed on abolt 3, by which the legs are pivotally held on opposite sides of such lever. The legs are connected by a centrally-jointed brace 4, which serves to retain them in proper relation. Upon the short arm of the lever is a bracing-block 5,held by strap-irons 6,.pivoted attheir ends, a bolt 7 holding the lower ends of the two irons.

8 designates a supporting-pawl pivotally secured by bolt 7 to one side of the outer arm of the lever andequipped with alaterallyprojecting stud 9 at or-near its lower end.

10 is a ratchet. It comprises a plate preferably positioned ina recess in the side of one of the legs of thecjack and formed with two ways or tracks 12 and 13. These ways are each arc-shaped and of corresponding longitudinal cnrvatureand intersectthat is, they unite-at their ends. Leading from the way 12 is a series of stepped notches 14, designed to receive and hold stud 9. By pivoting the pawl on the side of the lever the stud is held in engagement with the ratchet as against lateral displacement, the spring of the metal preventing lateral movement. In order to insure a positive engagement of the stud with the notches, each of the latter is formed with a recess 15 at its inner end, of depth sufficient to secure ample bearing-surface of the stud. The notches 14: are formed in the central portion of theratchet-plate, and coincident therewith are recesses 16 in the way or track 12, by which the stud 9 will be guided into the notches. Thus, it will be noted, the stud upon entering one of the recesses will be accurately guided into a notch 14, yet the provision of this means in no way hinders the free upward movement of the stud in the way or track 12.

The way 13 is formed with a smooth unbroken bottom, but is deeper at its top 17 than at the lower end 18. In other words, it is of gradually-lessened depth from its upper to its lower end, while the way or track 12 is the reversethat is, its depth is greater at its lower end or point of junction with the way 13 and less at its upper end.

In practice the handle of the lever being pressed down the pawl 8 will be raised, and its stud will travel upwardly in way 12 and hold the lever at any desired point by engagement with anyone of the notches. I Upon reaching the upper end of the ascending way 12 the pawl will slide over into the way 13, through which it will pass downwardly to the lower end thereof, whereupon it will enter the deepest portion of the ascending way 12.

WVhen the jack is not in use, the parts may be easily and quickly folded together, so as to occupy butlittle space. A jack constructed as herein described is extremely simple in construction, capable of easy operation, and not liable to readily get out'of order.

I claim as my invention 1. A jack comprising two supporting-legs anda lever, said legs being pivoted together and to the lever, said lever being thus fulcrumed between said legs, a ratchet-plate secured to one side of one of said legs and having ascending and descending ways or tracks united at their ends, notches being formed in the ascending way, and a pawl pivoted at its upper end to one side of the lever and hav ing a stud normally held in such ways and designed to engage said notches, substantially as set forth.

2. The combination with alifting-jack comprising a standard and a lever fulcruin'ed thereon, of a ratchet-plate on such standard having ascending and descending Ways or tracks, one being provided with notches having recesses at their inner ends, the other of said ways being smooth but deeper at one end than at the other, and a supporting-pawl connected at one end to said lever and having a stud designed to engage the notches in said ratchet-plate, substantially as set forth.

3. Thecornbinationwithalifting-jackcomprising a standard and a lever fulcrulned thereon, of aratchet-plate on such standard,

having ascending and descending ways or tracks, one being provided with notches having recesses at their inner ends, and also recesses at the outer ends of the notches extending over the Way, the other of said ways being deeper at its upper end than at its lower end, and a supporting-pawl connected to said lever and having a stud designed to travel in the Ways and engage said notches, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

JOHN H. KOONS. Witnesses:

ALF. N. RUssELL,

GEO. H. RUSSELL.

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