US1784574A - Jack - Google Patents

Description

JACK

Filed June 18, 1926 L 9 r 9 2 0 WW 7 2 MM Patented Dec. 9, 1936 warren; sraras JOHN M. oANrwnLL, or 'rARRYrowN, NEW YORK :racx

Application filed June '18,

This inventionrelates to screw lifting jacks particularly adapted for motor vehicles, the object of the invention being to provide an, improved jack of this class, simple in con- 1* struction, strong, durable, powerful in use, and easily operated. i

Another object of the invention is the provision of an improved combined liftin jack and rim tool which may be used, not on ly for 10 the removal of the shoes from the rims, but for materially increasing the height I of-the jack when necessary.

The particular object of the present invention is'the-provision of an improved'screw 15 acli which can be readily and inexpensively manufactured andso constructed that it can be readily used for-a -very low lift or easily extended for a high or extra high lift, asinay be necessary. s i

In the drawings accompanying andformiing a part of this specificatiomFigure 1 isa vertical sectional view of this improved screw jack, illustrating thetire irons in position for use as an extension of the jack, one of the rim members being shown connected with the base plate of the jack; Fig. 2 is a partly sectional view illustratingthe screws of the.

jack extended and also illustrating one-of the rim members in place on the base; Fig. 3 39 is a cross-sectional view, taken in line 33 of Fig. 1. Y

Similar characters of reference indicate corresponding parts in the several figures of the drawings. v

Before explaining in detail the present improvement and mode of operation thereof, I desire to have it understood that the invention is not limited to the details of construction and arrangement of parts which areillustrated in the accompanying drawings,

since the invention is capable of other embodiments, and that the phraseol-ogy which I employ is for the purpose of description and of limitation. s

This improved jack in its preferred form comprises a suitable casing 2 flanged at its lower end as at .3, to which is attached by screws a base plate 4. This casing comprises M a cylindrical portion 5'having an enlarged chamber 6 and having at its upper end an 1926. Serial m. 116,780.

inwardly extending flange 7. Located in this casing is a rotatable tubular sleeve 8, the I upper end of which isyoverlapped by the flange? of the casing while the lower end rests upon the base plat.e 4c, thus preventing lengthwise movement of the sleeve 8.- The sleeve 8 is provided with a large bevel gear 9 shown formed as a part thereof, and. in mesh with this bevel gear is a small bevel gear 10 carried by a suitable bracket or support 11 attached to aremovable plate 10.

- This removable plate is by suitable screws attached to an inclined portion of the casing and affords access ,to the casing and the proper positioning of the bevel gear 10. The bevelgear 10' is provided with a square ended spindle 12 for'th'e reception of a crank or handle by means of which it may be rotated thereby to rotate the bevelgear 9' and the tubular sleeve 8.

Within the rotary tubular sleeve Sis a pair of telescopic screws 13 and 14, both of the same length, the screw 13 being in the form of. a tubular member having exteriorthreads 15 along its length meshing with "a threaded portion or collar 16 carried atthe upper'end of the tubular sleeve 8. This tubular screw 13 is also. provided at its upper end with an interiorly threaded portion or collar 17 meshing with threads 18 located along the length .of the screw 14, which is shown as a solid ba'r;

The tubular screw:13 is provided 'exteriorly with a'longitud'inal slot or key way 19 for the reception of a spring pressed tooth :or plunger key 20' carriedat the upper end of the casing, and which may be inserted or removed through an opening closed by a suitable threaded plug 21. These screws 13 and 14 are completely housed within the casing 2, which can be comparatively low, thus enabling the jack to have a very-low lift and yet be extended to give a very high lift. The tubular screw member 13 has its threads smoothed or slabbed off at its upper end as at '22 and also smoothed orslabbed off at its lower end as at 23 and with which the longitudinal slot 19 communicates. The screw member 1 1 is provided witha suitable pin for limiting the upward movement thereof, this pin coming into engagement with the thread ed portion 17 of the tubular screw member and the tubular screw member is likewise provided with a suitable pin at its lower end which, when it comes into engagement with the threads of the sleeve 8, will limit its upward movement. The top of the screw member letis squared for the reception of a supporting head 24, which is pinned thereto and this head is slotted at its ends as at 25, the slots terminating in circular receses for the reception ofthestirrup bars 25" of a pair of tire irons 26. These tire irons can,

by means of the slotted'circular recesses 25",

be swung up or down and can also be-removed due to the fact that the stirrup bars are flattened. In other words, theseflattened portions correspond inf-thickness substantially to the slotted portions of the recesses while at right angles to the flattened portions they correspond substantially to the circular porr tions thereof. One of the irons is provided with a step 27 of tapered form and this'step projects into an opening 29 in the other iron when the irons are swung into a vertical position, the step serving as a. means of wedging the two together to hold the irons in such position. The step is provided with an open ing28 for the receptionof a cotter pin. This holding or looking step 27 may also be used as a step of the jack when desired, both irons in this case beinglof course swung downward, thus providing a stepcbelow' the top of the screws in any position of those screws, so that whenthe screwsare telescopedthe step i will be very close to the ground or road bed thus providing a means for engagingthe axle or under frame of a car in the event that the wheels are sunk inithe mud or sand or in other emergencies where there is but small space between the roadbed and the frame or axle of the car. The tops of the irons have suitable extensions 32 adapting them to be used as rim tools while the opposite parts 32 can be used as steps of the jack when the irons are in the position shown in Fig; 1. When the irons are to be used as a rim tool, a bifurcated plate may be slipped over the base plate in the manner shown in Figs. 1 and 2, this plate being provided with a tongue or projection 31 somewhat similar to those, as

V 32. formed at the tops of the tire irons.

In the operation of this improved jack, the rotation of the small bevel gear 10 rotates the b vel gear 9 and the sleeve 8 which isof course held agains longtudinal movement by the base plate and flange 7. The rotation of this sleeve around the tubular screw 13 forces it upward,'the rotation of the screw 13 being prevented by the tooth 20 passing'along the longitudinal slot 19 of the screw 13. This upward movement of the tubular outer screw 13 carries with it the innerscrew 14 without however rotating or extending it. When, however, the screw 13 has reached its extended position the tooth 21 passes out of the slot 19 and registers with the lower slabbed portion 23 of the screw 13 and in consequence the screw 13 will then be rotated by the tubular sleeve 8,

parts 32 in position to engage the axle or under frame of the car, as shown in Fig. 1

to increasefurther the height of the jack. A reverse operation first lowers the screw 13 as soon as-the' rotation thereof brings the slot. 19 opposite the tooth 20, until it has been fully lowered. When the slab-bed off portion 22 comes. opposite the tooth 20, the tubulerscrew 13 will then be rotated again by thesleeve 8', thereupon'to rotate the inner screw 14 and lower it in a manner which will readily' be understood. In spreading the shoe rim, it is necessary merely to use the upper. tire iron and not the lower ones, sincethe base of'thev jiack may be used against the rim. In contracting-the rim, however, thelower. tire iron 30 would be used. c

From the foregoing, it will be observed that ifeach' screw aboveits overlapping part is eight inches in height, a lifting jack is "provided having a total lift of 16 inches without the use oft-he: tire irons, while with the use of the tire irons the height of the jack is'materially increased, according to the length of the tire irons, thus providing a jack which is useful "for many purposes and particularly useful for motor vehicles where the underframe or axles are low hung or close to the ground.

Furthermore, it will be observed that both screws are of the same length and yet are no greater inlength than the casing.

It will be further observed that the bevel gear 9 is formed as apart of the sleeve 8 so that the sleeve and the bevel gear can be one castingwith thesleeve at its center resting directly on the base plate 4 without the necessity of providing any ball races, since the sleeve 8 has a tapered lower end provided with a hardened steel rivet or knob 10 so that the frictional resistance is very slight. Should there be any tendency of lateral. movement at the lower end of the sleeve 8, the base plate i can be provided with a depression for the knob or river 10 to fit into, similar to that shown in my 00- pending application, Serial No. 171,498, filed February 28, 1927, although it is believed that thefrictional engagement of the rivet '10 with the base 4 when load is upon the jack, together with the fact that there is considerable bearing surface between the upper end of thesleeve 8 and the casing 5 is sufiicient to prevent any such lateral movement. "Further, as the threads 16 and 17 are formed as parts of the screws 13 and 14 respectively, this eliminates the necessity of providing separate pinned collars likely, to

be displaced, and by slabbing off the threads of the screw 13 as at 22 and 23 the necessity of specially fori'ning a separate annular groove is avoided, while the provision of a spring pressed tooth which can be easily removed and replaced when worn is permitted.

' These improved features together with others and the improved form of tire irons very much simplify the construction, de-

creasing the cost of manufacture and ren-' d-ering the ash more easily operated, so that the same forms an improved jack over that shown and described in my Patent No. 1,540,511, dated June 2, 1925; i i

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although with out atteinptingtoset forth all of the forms in which it may be made, or, all of'the modes of ts use, I claim:

1. In a screw lifting ack, the combination of a supporting casing, a pair of telescopic lifting screws within said casing, the outer telescopic screw having slabbed portions at its top and bottom communicating.

with a longitudinal key way, and-a spring pressed plunger carriedvat the upper end of the casing and cooperating at different times with said slabbed portions and key way, and means for lifting one of said screws without rotating it and for then rotating it thereby to lift the other screw and including a rotatable tubular sleeve also housed entirely within and extending substantially from end to end of said casing, and mechanism connected adjacent to the lower end of said sleeve for rotating said sleeve.

2. In a screw lifting jack, the combination of a supporting casing, a pair of telescopic lifting screws, one comprising a tubular exteriorly threaded member having integral interior threads at its upper end, a spring pressed plunger for preventing the rotation of said threaded tubule r member at one time,

' said member having slabbed portions at its top and bottom and a longitudinal key way communicating therewith for cooperation. with said spring pressed plunger, means for lifting one of said screws without rotating it and for then rotating it thereby to liftthe other screw and including a rotatable tubular sleeve housed entirely within and extending substantially from end to end of said casing and having integral interiorly located threads at its upper end and an integral bevel 3. In a lifting jack, the combination of a pair of telescopic inner and outer screws operatively connected, a threaded sleeve embracing said outer screw for operating the same, a supporting casing housing said sleeve en tirely within the same, said sleeve extending substantially from end to'end of the casing, and aspring pressed plunger carried at the upperend of'said casing, said outer screw having a vertical keyway for receiving said plunger and terminating ina pair of slabbed portions at its upper and lower ends to permit the plunger to pass around the threads adjacent to said slabbed portions.

l. In a lifting jaclgthe combination of a pair of telescopic inner and outer screws oper a spring pressed plunger carried at the upper end of said casing,- said outer, screw having a vertical keyway for receiving said plunger and terminating in a pair of slabbed portions at its upper and lower ends to p'ermitthe plunger topass around the threads adjacent to said-slabbed portions, said threaded sleeve also having a bevel gear and said gear and sleeve being formed as a single casting.

5. In a lifting jack, the combination of a supporting casing, a pair of telescopic lifting screws, means for lifting one of said screws without rotating it and for then rotatit to lift the other screw and including a vertically extending rotatable sleeve embracing one of said screws and housing entirely within and extending substantially from end to end of the casing, gear means connected to said sleeve for rotating the same, a spring pressed plunger located at the upper end of the casing, and means cooperating therewith and comprising a vertical slot carried by the outer telescopic screw and a pair of slabbed portions at theends of said slot for permitting iri sequence sliding and rotating movements of the outer screw.

6. In a screw lifting jack, the combination of a casing, a rotatable sleeve located entirely within and extending substantially from end to end of saidicasing and having a bevel gear and a threaded portion at its upper end a tubular exteriorly threaded screw cooperatingwith the threaded portion of said sleeve and having an 'interiorly threaded portion at its upper end, a telescopic screw within said threaded screw, said outer screw vhaving akey way and a pair of slabbed portions at the of said outer sleeve theouter screw will be extended without rotation thereof and will then be rotated to rotate theinner screw.

7. In a lifting jack, the Combination of supporting means, a lifting member, means for operating the same, said member having a head, a pair oftire irons swingingly carried thereby, one of said irons having an opening and the other a jack-lifting step projecting thereinto. V 1

-8. In a lifting jack, the combination of supportingmeans, a'lifting member, means for operating the same, said member having a head, apair of tire irons swmgingly'car ried thereby, one of said irons having an opening and the other a ack-lifting step projecting thereinto, said jack-lifting step havi-ng a wedge formation.

9. In a lifting jack,rthe combination of a casing, a'pair of telescopic inner and outer screws located therein and operatively connected, means for operating the same successively, and a spring pressed plunger carried at the upper end of said casing, said outer screw having a'vertical key way for of the outer screw at one time and preventing its rotation at another and comprising a key way and slabbed portions carried by the outer screw at the ends of said key way, and a spring pressed plunger carried at the upper end of the casing.

-11. In a lifting jack the combination of supporting means, a lifting member, means for operating the same, said member having a head, a pair of tire irons swingingly carried by said head and adapted to be swung up ordown, one of said irons having a step projecting therefrom in position for use belowithe top of the jack in any position of the lifting member and said irons having means for connecting them when swung into position to operate as an extension of the jack.

12. Ina lifting jack the combination of supporting means, a pair of telescopic screws carried thereby, means for operating the same, a head carried by one of said screws, a.

pair of tire irons swingingly carried by said head-and'adapted to be swung up or down, one of saidtire irons having a step projecting therefrom in position for use below the top of the jack in any position of the screws.

13. In a lifting jack ,the combination of: supporting means, a pair of telescopic screws carried thereby, means for operating thesame, ahead carried by one of said screws, a pair of tire irons swingingly carried by said head and adapted to be swung up or down, one of said tire irons having a step projecting therefrom in position for use below the top of the jack in any position of the screws and the other iron having an opening for the reception of said step when the irons are swung upward.

14. A tire iron for use with a jack having a hook-shaped rim engaging end, an integral stirrup formed opposite end, and a jack step therebetween. i

15. A pair of tireirons for use with a jack each having a hook-shaped rim engaging end and astirrup formed opposite end, one of said irons having a jack step and the other an opening for the reception of such step.

16. A jack comprising a base, lifting means carried thereby, means for operating it, and tire removing means comprising, a member adapted to engage the base of the jack and provided with means for engaging the rim of a tire, and swinging means carried by the lifting means and provided with means for also engaging the rim of a tire and with a jack step between the ends thereof, and means carriedby said swinging members for connecting them when swung into position to operate as an extension of the jack. 7

Signed at 182234 Park Row Building,

New York city, N. Y., this 7th day of June,

JOHN M. CANTWELL.

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