US1201413A

US1201413A - Jack.

Info

Publication number: US1201413A
Application number: US5292115A
Authority: US
Inventors: Le Roy Willour
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-09-27
Filing date: 1915-09-27
Publication date: 1916-10-17
Anticipated expiration: 1933-10-17

Description

LE ROY WILLOUR.

JACK.

APPucATloN FILED SEPT. 27. m5.

LQOLMS. Patented oct. 17,1916.

3 SHEETSf-SHEET l.

LE ROY wlLLoun.

JACK.

APPLICATION FILED sEPLz?. w15.

Patented Oct. 17,1916.

3 SHEETS-SHEETZ.

LE ROY WILLUR.

JACK. I

APPLICATION FILED SEPT. 27 1915.

l .E301 ,41 3 Patented Oct, 17, 1916.

3 SHEETS-SHEET 3.

UNITED s'rAaEs Parana* ormoni.-

LE ROY WILLOUR, 0F ASHLAND, OHIO.

JACK.

-19am Specification of Letters Patent.

My lnventlon relates toimprovements in lifting jacks, of the type which embody gen- 1.0'

erally a lift-bar having teeth, and a plurality of paw'ls engaging the teeth forraising and lowering the lift-bar.

An important object of the invention is to provide means to reverse the operation of the pawls, which are simple in construction,

- inexpensive to manufacture, andcompact.

.I A further object of the invention is to provide novel and simple adjustable means,

carried by the lift-bar, to Contact with the load. f

A further object of the invention is to provide a lifting jack of the above mentioned character, which is reliable and expeditious in operation.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same, Figure 1 is la side elevation ofa lifting jack embodying the invention, Fig. 2,is a central vertical longitudinal sectional view through the same, partsin elevation, withthe paw'l reversing rod or bar held in the inactive position,

Fig.4 3 is a similar view, withthe pawl reversing rod or bar in the active position, and the operating handle inthe lowered position, Fig. 4 is a similar view with the oper-` ating handle in the `elevated position, Fig.

5fis a perspective view of the pawls, Fig.

L 6 is'an enlarged horizontal sectional view slightly diil'erentform of means for Vhold-- taken online 646 of Fig. l, Fig. 7 is a.

4transverse sectional view taken on line 7e-7 of Fig. 6, Fig. 8 is an end elevation of a ing the pawl reversing rod or bar in the outer orvinactive position, with therod or bar in the active position, Fig. 9 is a similar view with the rod or bar inthe inactive position, and, Fig. 10 is a longitudinal sectional view taken on line 1 0-1O o fvFig. 8.

In the drawings, wherein for the purpose' of illustration is shown a .preferred embodi- .17, as shown.

,Patented oet. 1v, 191e.

ment of my invention, the numeral 15 designates a hollow standard, shown square Ain cross-section, while the same'may be constructed in any other suitable shape.A This standard is provided at its lower end with a foot or base 16, as shown. Formed upon one side of the hollow standard l5 and near its top is a laterally extending housing 17,- for Va purpose to be described. Mountedl to slide within the hollow standard 15 is a liftbar 18, having ratchet teeth 18. This liftbar is preferably vhollow and preferably formed square in cross-section, as showy. This lift-bar has a long itudinal opening 19, preferably square in cross-section. The opening 19 leads -into a reduced circular opening20 at the upper end of the lift-bar.

Mounted to move longitudinally within the opening 19 of the lift-bar 18, but havin g no screwsthreaded engagement therewith, 1s a screw 21, the low'er end of which is provided with a transverse pin 22, oper- I ating in the corners of the opening 19, thus preventing rotation of the screw 21. screw 2l extends outwardly beyond lthe head 23 of the lift-bar and has a head 24, attached thereto by any suitable means. between the

heads

24 and 23 is an adjust- Arranged ing nut 25, having screw-threadedengage-` l lat bar 18'. with'the adjustablev screw 21, it is n yto be understood that theinventi'on is in np vsense restricted to this screw, as satisfactoryI resultsmay be obtained without'its-employi ment. v ,Y i?" ""V i" The numeral 26 designates an operating`A lever, having an, outer tubuilarportio 27 for receiving the inner endofahandle (not shown). vThe leverf 26 .hasrits innerend forked, Providing spacedy lines or 'r'sides 1.28,'

which are apertured ,at- 29,`|` for! receiving-"aV4 transverse, pin 30,'extendigxthrouglr openf ings 31, formedinithe ,sides of theh'ousing 1 ,.Hf n Arranged within ,l y .lever 26, between thetines28, are operatin' `pawls 32 and 33,'pivotally connected the with by means of )pins SLL o'r thelike. "f'llhe,` y outer pawl- 32 is longer thanfthe inner pawlgh 'r a.. .fo-.1.a y

as shown. The pawls 32 and 33 are pro- 110 los vided adjacent their pivots with openings 35, receivingV the ends of a spring l36, engaging thesel pawls and coiled about the pins 34. The function of this spring is to hold the pawls in proper contact with the teeth 18. The pawls 32 and 33 are pro -vided adjacent their pivots with dependingextensions or fingers 37 and 38 respectively, preferably of the shape shown, and which are preferably formed integral with the pawls. vWhile I prefer to mount both pavwls jupon the operating lever, yet it is to be ,understood that the invention is not necessarily restricted to such arrangement, as sat-4 onejfpawl upon the standard orhousing and the.- other upon the operating lever.

The numeral 39 designates a preferablyv horizontal reciprocatory preferably cylindricalpawl reversing rod or bar, provided atritskinner end with upstanding fingers 40 andi` 41,5" preferably formed integral therej'witlifand` adapted to vcontact respectively with/theadepending fingers 37 and 38, for a purposetoabe descr-1 ed. Thereversing rod or.b'a`-'r` 35i-fris mounted to slide or reciprocate in affsleev'e 43,-cast upon the lower end of the l1ous`ing7ll'17.sfv` A suitably stiff coil spring 45 surrounds the inner end of this rod or bar andvfserves74 to movev it inwardly, but will permitfoff itsreciprocatory movement. One 1 side ofithe Todi" or bar 39 is provided with an elongatedgroove or recess 46, adjacent the .innerrfendlof vhich is disposed a notch 47. Theisleeve vprovided witha transverse 'recess'.48girecerving a preferably reciprocatory2;latchfr49; adapted to enter the recess 46 anidffnotch 47,-and forced inwardly by a spring: 1,150. UA vliodiffl is rigidly attached to the'vla'tch nd perates through an open- 3 r'ovided at its outer end with .fcnenient operation. The rod e'clat its outer end with a f v n jhereby it may be'convenientlymove'dflongitudinally. l=fiFrorn the foregoing'- description it is obvious thatwhen the 1latch 49 enters-the notch 47, asindicatedinfFigi'G, the reversing rod isfgac'tory results are obtainable by pivoting rod or' bar` is turned upon its longitudinal p axis, whereby the ends of the pin 52 engage the end wall of the casing 43, thus holding the rod or bar 39 in the outer position, and thevfingers 40 and 41 in a position whereby they cannot contact with the fingers 37 and 38 respectively.

The operation of the lifting jack is as fol` lows: To raise the lift-bar 18 the pawl reversing rod vor bar 39 is held in the outer or inactive position, whereby its fingers 4() and 4l do not contact with the fingers 37 and 38 respectively, Upon the down stroke of the lever 2G, the inner pawl will advance the lift-bar upwardl f a step and upon the en d of the down stroke the outer paw 32 will trip upon its tooth and engage beneath the neXt tooth. above the tooth engagedby the pawl 33. Upon the 11p-stroke of the lever v2G, the outer pawl 32 raises the liftbar 18 a step and the inner pawl 33 trips upon its tooth to engage beneath the next lower tooth. In this manner the lift-bar is advanced upwardly a step when the lever 26 is swung in either direction. To lower the lift-bar 18 the reversing rod or bar 39 is released and moves inwardly, so that its fingers 40 and 4l are adapted to contact re#v spectively with the fingers 37 and 38, as more clearly illustrated in Figs 3 and 4. At this point it might be well to state that the spring 45 is stiffer than the spring or springs 36 and can overcome the same.

TWhen the lever 26 is swung downwardly, in f' thevlowering operation of the lift-bar 18,

as soon as the inner pawl 33 is elevated sufirciently to take the load of the liftlbar from 4the outer pawl 32, the outer pawl swings outwardly, disengaging its tooth l8f, as the finger 37 thereof is contacting with the finger 40. Upon up-stroke of the lever 26, the finger 40 remaining in contact'with ythe position so that it will not engage. with the next upper tooth 18, but skips it and engages with the second upper tooth, thus effecting a lowering movement of the Wlift-bar, during the greater portion of the up-strokev of theV operating lever, as said lift-bar descendswith the pawl 33. When the lever reaches the end of itsup-stroke, the outer pawl 32 slightly elevates thev lift-bar, relieving the load from the inner pawl, wherebyI .this inner pawl swings` outwardly, as; its finger v 38 contacts with the finger 41. AUponthe down stroke of the lever the inner pawl does not contact with the adjacent tooth, 181, but

y skips it and engages the next upper tooth,

thus effecting a lowering' movement :ofthe Yfinger 37, the pawl 32 is held in the outer lift-bar; for the ,'-g'reater portion of the down stroke of the operating lever, as the liftbar descends with the outer pawl;

Y joined claims.

Having thus described the invention, I

` claim:

` 1. In a lifting jack; a standard; a lift-bar having slidable engagement therewith and provided with teeth; an operating lever pivotally connected with the standard; a plurality of pawls pivotally mounted upon the operating lever to engage the teeth of the lift-bar, said pawls being providedwith depending fingers to move them; spring means to move the paw'ls into engagement with the teeth of the lift-bar; a reciprocatory shifting member arranged near the lower ends of the pawls and having upstanding fingers to contact with the lingers of the pawls; a spning to move the reciprocatory shifting member in one direction; andmeans to hold the shifting member in the outer inactive position.-

2. In a lifting jack; a standard; a lift-bar having slidable engagement therewith and provided with teeth; an operating lever pivotally connected with the standard; a plurality of pawls having their lower ends pivotally connected with the operating lever and their upper ends adapted to contact with the teeth of the lift-bar, said pawls being provided adjacent their lower pivoted ends with depending fingers; spring means to move the pawls into engagement with the teeth of the lift-bar; a reciprocatory shifting member arrangednear and beneath the lower ends of the pawls and having upstanding fingers to Contact with the fingers of the pawls; and spring means for moving the reciprocatory shifting member inwardly.

3. In a lifting jack; a standard; a lift-bar having slidable engagement therewith and provided with teeth; an operating lever pivotally connected with the standard; a plurality of pawls pivotally mounted upon the operating lever to engage the teeth of the lift-bar, said pawls being provided with depending lingers to move them; spring means t move the. pawls into engagement with thel teeth of the lift-bar; a reciprocatory shifting rod arranged near the fingers of the pawls and having fingers to contact therewith, said rod being provided with a recess; a spring to move the rod inwardly; and a spring pressed latch adapted to enter the'recess in the rod to hold it in the outer position.

4l. In a lifting jack; a standard; a lift-bar having slidable engagement with the standard and provided with teeth; a laterally eX- tending housing secured to the standard and provided with a sleeve having a longitudinal groove; an operating lever pivotally mounted within the housing; a plurality of pawls pivotally mounted upon the operating lever to engage the teeth of the lift-bar, said pawls beingprovided with fingers to move them; spring means to move the pawls into engagement with the teeth of the liftbar; a reoiprocatory shifting bar mounted to slide within the sleeve and having a transverse pin operating in the groove, said bar being provided with fingers to contact with the first named fingers; and means to move the bar inwardly.

In testimony whereof I aiiix. my signature o in presence of two witnesses.

LE ROY TVVIIILOU'R.

lVitnesses CLYDE C. SHERICK,

C. J. VVONER.