US1175211A - Quick-action jack. - Google Patents

Description

vLE ROY wilLLouR. QUICK ACTION JACK.

APPLICATION FILED APR. 14| 1915.

Patented Mar. 14, 1916.

2 SHEETSWSHEEY! (T1111 uc 1 i'oz @1M/mman 1 LE ROY WILLOUR.

QUICK AcrloN JACK.

5 A APPLICATION FILED APR.14. 19I5. L175,21'1.

Patented Mar. 14, 1916.

Y SHESHSHEET 2.

To allwiow. it may concern:

nBe it ki own that I, Lr. ROY WiLLoUR, tcitizen of the United States, residing at `Ashland, in the county of Ashland and State Y of Ohio, have inventedy certain new and useof which the following is a specification.-

My invention relates to improvements in iftin'g jacks', of the general type having a ift-Ibai operated rby pawl and ratchet means.

wenn important object, of the invention is to provide a jack'of the' above mentioned will be advanced a step 'upwardly when the te r ,a step downwardly when the operating lever Ayistswung upwardly, but the extent 'of upvyvard movement of the lift-bar is substantally greater upon vthe down `'stroke of the lever, whereby the force necessaryto swing e the'ilever upwardly in advancing the "liftto-move it downwardly, thus rendering. the Tack more convenient to operate.

ver

f of the pawls so that'they will' lowervfthe liftbarf aswell as raise it. l

A further object of the invention is to acter,- embodying -a toothed lift-bar 'ad- .vanced by 'a pair of pawls, both of, which [lift-bar to support the load thereon when the operating lever 'is kat rest. i i A further object of the invention is to apwls, and the `spring Imeans associated Iierewith. 1 i

fr furtherobject of the invention 'is to ,provide a support member or bar carried v the xlift-bar and cariving an adjustable ii'oseor' rest. i Y

-",Arifurther object ofthe invention is to "improve in general the construction of jacks .of this type, with a view of rendering inem -more expeditious 'and reliable in operation.

`rovide a ack of the above mentioned char eter, which is simple in construction, inxpensiveto manufacture, strong and durable.

`55 vention will be apparent during the course 'it' the following description.

"-iuhlmprovements in Quick-Action Jacks,"

character, so constructed that the lift-bar` operating lever is `svvung downwardly and bar is substantially lessv than that. requiredA 'Afurther object of the invention is to provide means for reversing the operation provide'a jackofthe above mentioned char# are: in 'engagement with the teeth of the improve the' construction of the pawl or y 5 shown.

:iX-further 'object of` the invention is to i Other objects and advantages of the in,

j UivTED 'STATES PATENT? OFFICE' comic-ACTION JACK Patented Mar. i4, ioic.

Application ledfApi-il 14, 1915. Serial No, 21,326.

In the accompanying drawings forming a part of this'speciiication and in which like numerals are employed to'designate like parts throughout the same, Figure 1 is a side elevation of a li-fting jack embodying my invention, Fig. 2 is a central verticalv longitudinal sectional view through the same, parts being shown in elevation, Fig. 3 is' a horizontal sectional Viewv taken on line 3--3` of Fig. 1, Fig. 4 is a fragmentary side elevation of. the upper portion of the "jack, with the side plate removed for showing the control'lever in the inactive position, Fig. 5 is a similar view with the 'A ontrol lever in the active position, Fig.. is aview similar to Fig. 2, with parts broken away, and the operating lever in the upper osition and Fi 7 isa ers ective view.

of the side plate, Fig. Sis a horizontal sectional view taken online 88 of Fig. 4:, and, Fig. 9 is a`similar,view'tak`en on line 9 9 of Fig. 4.' i z 1 In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 10 designates a preferably tubular standard, provided at its lower end with a footor base 11, as shown. Formed upon the.top or upper end of this standard is a housing 12,

one side of which is closed and theopposite side open and normallycovered by a remov-v i able side plate 13,held'in place by a bolt 14',- and trunnion 15, passing through apertures therein. The tubular standard 10` has its upper portion 16 projecting into the housing A12 and the bolt la and trunnion 15 are p i carried by such upper portion.

Mounted to reciprocate'within the tubular` i standard 10 or having slidable engagement therewith is a lift-bar 17, provided upon one longitudinal. edge with teeth or ratchet teeth 18, facing downwardly, as shown.

Arranged upon the side of the lift-bar 17 adjacent the teeth 18 is a pair of operating pawls 15) and-Q0, engaging the teeth, and arranged `within theliousing 12, as

ing ahead Q2, extending into the housing The numeral 91 designates an Opf '12 and operating in an opening 23 therein.

This head turns upon a transverse pin or pivot element 2i, which is spaced for sub-v stantial distances from the inner end and top of the head 22, as shown. yThe pawl Q0 is substantially longer than the pawl 19 and these pa'wls have their pivot ends forked.

providing longitudinal slots 25, such forked ends being apertured for receiving pins or pivot elements 26 and 27, carried by the head 22. The pivot 27 of the pawl 19 is arranged inwardly and to one side of the pivot 24 and below it for a substantial distance, when the lever 21 is elevated, and, 4 above it whereby pawl 19 is made to travel a substantially greater vertical distance than pawl 20. The operating lever 21 is provided with a depending stop lug .21 adapted to engage with a portion of the housing 12 and positively limit the downward movement of the lever while the upward movement thereof is limited by engagement of4 the top of the lever 21 with the housing 12.

The. numeral 28 designates a sprmg, having' portions wound or coiled about the pins or pivots 26, 27, and arranged within the slots 25 of the pawls. The ends 29 of th ispring extend upwardly through the openings 25 and engage with the outer sides ofl the. pawls 19 and 20.

The pawls'20 and 19 carrylaterally extending'pins 30 and 31 respectively, the pin 31 being'4 longer than the pin 30 and projecting through the opening 32 in the plate 13, as shown. The numeral 33 designatesa control lever, which is approximately hammer-shaped and provided at its upper end with a laterally extending head 34 and near and beneath this` head with a recess forming a cam face 35, adapted to engage respectively with the pins 30 and 31. At its lower end the control lever 33 is provided withan aperture for pivotally receiving a lug or trunnion 36, carried by the open side of the housing 12, as shown. A spring`37 is coiled about a trunnion 36', with one end extending through an apertured lug 38 carried by the lever 33 and its opposite end engaging a rib 39, carried by the housing 12. Pivotally mounted upon a trunnion 39 carried by the housing 12, is a latch 40, having a cam head 40', adapted to engage and disengage an extension 41', formed upon the lower end of Athe lever 33, and depending therebelow, as shown. The function of this latch is to hold the control lever 33 in the inactive position,

as shown in Fig. 4, whereby the pawls will operate to raise the lift-bar, and when the latch is swung downwardly the control lever will be released and its spring will move it forwardly, whereby the same will enga-ge with the pins carried by the pawls and the pawls will lower the lift-bar upon the swinging movement of the operating lever, as will be more full), explained. s

The numeral 42 designates a lift-head, provided with a depending socket 43, de-

tachably receiving the upper end of the A lift- -bar 17. Depending from this lift-head 42 and preferably formed integral therewithv is a support-bar 43, embodying spaced sides 44 connected at their lower ends by a` transverse web 45. These spaced sides are provided upon their inner surfaces with longitudinally extending' ribs A46, provided in their lower portions with openings or notches 47 forming teeth 48. These teeth are provided upon their inner sides with preferably curved recesses 49, also formed upon vthe upper portions of the ribs above the teeth, for a purpose to be described;

The numeral 50 designates a vertically adjustable support-bracket or rest provided upon its inner Vside with a longitudinal rib 51, adapted to project into a longitudinal opening 52, occurring between the spaced ribs 46. y At the upper end of the rib 51 is a T-shaped head 53, having its shank 54 adapted to pass through theopening 52 and its transverse head 55 adapted to be arranged inwardly of the ribs 46 and having,

curved faces to engage with the recesses 49 and thus constitute a pivot upon which the supportkv bracket 50 may swing whereby a transverse tooth or teeth 56 carried by its lower end may be moved intov and out of the .openings or notches 47. It is thus apparent that the support bracket 50 is securely at-V tached to the support-bar 43 and may be conveniently longitudinally adjusted thereon.

The operation of the jack is as follows: When itis desired to move the lift-bar 17 upwardly the latch 40 is swung upwardly y whereby the control lever 33 is held in the inactive position, out of engagement with the pins 30 and 31. When the lever 21 is swung upwardly, the upper pawl 20 engages with one of the ratchet teeth 18 raising the lift-bar a step while the lower pawl trips over the next lower tooth and engages therebeneath, and upon the downward movement of the operating lever the lower pawl elevates the lift-bar a step while the upper pawltrips over the next upper tooth, such operation continuing throughout the upward movementof the lift-bar. It is thus apparent that the lift-bar is advanced a step upon the upward movement of the lever 21, as well as the downward movement thereof.

Particular attention is called to the fact that I lever, by virtue of the fact that they are `"pivoted to the` operating lever upon oppiosite sides of its swinging pin .24, but the upper pawl moves vertically only about `half the distance of thevertical movement of the lower pawl, and this iscaused by the lpeculiar location of the pivots-26, 27, of*

these pawls'with relation to the `pivot 24, as

hereinbefore described. yThis is an`i1np`or-. i tant feature ofthe invention, as `by causing` lever moving through the same distance upon the up and down strokes, onlyfhalf the force is necessary tofraise the load upon the up stroke o'f the lever, `it being` `well known i `that it is'more convenient to exert considerable forceupon the down stroke of the lever than upon its up stroke.

when it ie deeiredte move eee ila-ber downwardly, the latch is moved downwardly to release the control lever 33 and the spring 37 moves the lever 'forwardly whereby the end of the head 34 and the cam 35 will engage the pins 3() and 31 re- 1spectively. The spring 37 is stiffer than the ends `29 of the spring 28, and will therefore automatically `moveeach pawl from engagement with'the teeth 18 `of the liftebar when the load is taken ed ofthe pawl., lVhen the control lever 33 is in the active position and the lever 21 is swung to the eXtreme lower position with the stop lug 21 engaging the lower portion of the housingf12, the load will be taken off of the upper pawl and the spring 37 will at `once swing lthe control lever 33 forwardly so that its head 34 byengaging with pin 30 will move the outer pawl out ofengagement with the teeth of the lift-bar. Upon thevupper stroke of the lever the upper end of theA pawl `20d`oes not engage with the adjacent tooth but with the next upper tooth, thus allowing the liftbar to descend and follow the downward movement of the lower' pawl 19, until the upper pawl engages with the next upper tooth. During this upward movement of the `lever 21 the-pin 31 slides upon cam 35, comi pressing thespring `37 as pawl 19 has the load,` but Awhen the load is transferred to pawll 20, lever 33 moves outwardly, and

v carries pawl 20 out of engagement with the tooth,'retainin`g the samel in such disengaged `position forthe down stroke of the outer pawl, but at theend of the down stroke the pin 31 again disengages the cam 35, whereby Vthe inner pawl `engages with the next upper tooth while A-theienud of the head approximately simultaneously engages with the pm 30 to cause theouter pawl to disengage withA the teeth for the up stroke of the lever, as hereinabove described.

It isI to be understood that the form of my invention herewith shown and described is tobe taken as apreferred example ofthe same, and that various changes in the shape, Size, and arrangement of part'smay be resorted'o withoutdeparting from the spirit of thev invention or the scope of the sub- `joined claims. `Having thusdescribedwthe invention, I

claim:

11n a lifting jack of the character described, a' standard, a lift-bar' slidably en-` gaging therewith and provided with a longiengagement with the teeth.

2. In a lifting jack of the character described, a standard, a lift-bar slidably en- `gaging therewith and provided with a longitudinal set of teeth, an operating lever pivotally connected with the standard near the teeth, a pair of pawls having their free ends arranged to engage with the teeth and their opposite` ends forked and apertured, pivot elements carried bythe operating leverand passing through the apertures of the pa'wls, and a spring including coiled portions surrounding the pivot elements within the forked ends of the pawls and having outwardly extending arms engaging with the pawls to force them into engagement with the teeth. A

3. In a lifting jack ofthe character described, a standard, a lift-bar slidably engaging therewith and provided with a longitudinal set of teeth, an operating lever pivotally connected with the standard near the teeth, a pawl arranged to engage with the teeth and having one end forked `and apertured, a pivot element carried by the opere ating lever and extending through the aperture of the forked end of the pawl, a spring coiled about the pivot element within the forked end of the pawl and extending outwardly therebeyond for engagement with the pawl, and a co-acting pawl arranged near the first named pawl to engage With the teeth.

4. In a jack ofthe character described, vaV standard, a lift-bar slidably engaging therewith, means to effect thelongitudinal movetudinal set of teeth, an operating lever piv- Y,

ment of the lift-bar, a support-bar connected with the lift-bar to move therewith and providedfwith spacedteeth extending longitw, dinally ofthe lift-bar, and a resthaving longitudinally adjustable engagement with i 5. In a jackof the character described, a standard, a lift-bar having slidable engagement therewith, means to effect the longitudinal movement of the lift-bar, a supportbar connected with the lift-bar to move therewith and provided with longitudinal .ribs and spaced teeth arranged beneath the ribs, and a rest provided near its upper end with a headed member to engage upon the inner sides of the ribs and near its lower end with a tooth for detachable engagement with the spaced teeth of the support-bar. f 6;/ In a jack of the character described, a standard, a lift-bar having slidable engagement` therewith, means to effect the longitudinal movement of the lift-bar, a supportbar connected With the lift-bar to move l support-bracket to therewith, and including spaced sides pro-

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