US2064445A

US2064445A - Bumpek sack

Info

Publication number: US2064445A
Authority: US
Publication date: 1936-12-15
Anticipated expiration: 1953-12-15

Description

'15, 1936. 1 1:).I NlLsON BUn/11313K JACK Filed Sept. 10, 1935 wwf/bf -Zeawfd Z2 27Min/1^' WZJGJMM @Patented ec. E59 i936 20 isi/ps,

An object of my invention is to provide a' bumper jack which is simple, durable and comparatively inexpensive to manufacture.

More particularly it is my object to provide a jack structure of post-like construction having an operating member extending from one end thereof and reciprocable toward and awayfrorn the post-like member, lifting means being provided which is vertically slidable on the post-like member and has one or more projections for engaging the bumper of an automobile for lifting the bumper and thereby one end of the automobile.

Heretofore jacks have been made which set under the axles of the automobiles and some of these have extension operating means making them more convenient for operating the jack from a convenient position remote from the jack itself. Present day automobiles'are constructed with considerable over-hang of the body relative to the axles and it is therefore quite dimculh. especially when balloon tires are used and have been punctured, to get a jack properly' positioned under the axle and still be able to operate the jack from a comfortable position without getting ones clothes dirty and experiencing other dimculties. My present invention accordingly is designed to eliminate the necessity for placing a jack under the axle, the jack being cooperable with the bumper of the automobile which is aly Ways located at the extreme end thereof and the jack being suinciently powerful to lift either one l entire end of the car or one corner thereof as de- A further object is to provide operating means for the jack which is in a convenient position for manipulation, specifically, extending from the upper end of the post-like jack and vertically reciprocable for the lifting operation.

A further object is to provide a jack which has a considerable range of movement, one which is readily positioned and may be quickly-adjusted to the bumper or other projection with which it engages and can thereafter be conveniently operated in a standing position for lifting the bumper.

Another object is to provide the lifting mechanism of the jack in the form of a lifting piston and a hydraulic pump and to provide readily op# erable release means permitting lowering of the jack without any manipulation thereof, other than opening a release valve.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointne JACK vlbeoinard D. Nilsen, Wayzata, Application september 1o, 193s, sei-iai No. 39,929

(ci. 25e-93) ed out in my claims and illustrated vin the accompanying drawing, in which:

-Figure 1 is a. side elevation of a. bumper jack structure embodying my invention and showing it cooperating with a bumper bar.

Figure 2 is an enlarged sectional view on the line 2 2 of Figure 1 showing the lifting means Figure 'I shows a modied form of load sup` port. Y

On the accompanying drawing,-I have used the reference numeral l0 to indicate a. base or foot for my jack structure. It is provided with up `struck perforated ears l2 'through which a pivot pin lli extends. The pin also extends through a i lower cylinder head I6 'of alifting cylinder i8. The lifting cylinder i8 is enlarged at its upper end to form a reservoir 2D and the upper end is provided with a head 22 anda-packing nut 2li.

Within the lifting cylinder I8 l'provide a cup' leather lifting piston 26 connected with a tubular lifting piston rod 28. The upper end of the rod 28 extends through the packingnut 2d and is yconnected by locknuts 3B to a yoke 32; The

arms of the yoke indicated -at 32a extend downwardly outsidethe reservoir 2li and are hooked at their lower ends as indicated at 434. The hooks enter vslots 36 `of a tubular lifting member 38 whereby raising movement of the lifting piston l26 and its rod 28 will raise the yoke 32 and conse'- quently the lifting member 38.

The internal diameter of the member 38 is substantially the same as theexterior diameter of the reservoir 20 to provide a sliding tlescoping connection between these two members. Below the reservoir 20 the. lifting cylinder I8 is provided with a plurality of guide strips 80 which provide a. four point guide as shown in Figure 6 fox-,all or thel portion of the tubular lifting member 3 8 when'in aposition extending below the reservoir 20. o

The lifting member 38 is provided with a. pair of hook-

like projections

42 and 44. One of these is adapted to engagea bumper bar 46' of an automobile or any other device to be raised by the Jack structure. f

From the foregoing description, it will be 'obvious that the lifting member 88 can be raised ton. For this purpose, I provide a pump com-- prising a pump cylinder 48, a plunger rod 50, intake valves 52 and an outlet valve 55. The intake valves are gravity seated while the outlet valve is seatedby a spring 56. The plunger et has an enlarged rod-like extension or operating rod et to provide sufficient strength to prevent bending, the plunger itself being quite small to secure the required diierential of diameter between the pump plunger 5D and the lifting piston 2B.

The upper end of the operating rod extends from the upper end of the tubular lifting piston 2S through a packing nut 60 and terminates in an operating lrnob 62. Upon reciprocation of the knob 62 upwardly, oil will be drawn from the reservoir 2li, through the check valves 52 into the pump cylinder M3. On the down stroke, this oil will be forced through the outlet check valve te and raise the lifting piston a distance corresponding to the volume of oil pumped through the valve et. Thus by a number of reciprocations the bumpers 4t will be raised step by step.

With the jack structure in the lowered posi-z tion, it is nrst placed adjacent the bumper and the yoke 32 then grasped and pulled upwardly which causes flow of oil through the

check valves

52 and 54 so that the jack may be raised by hand to contact with the bumper. Thereafter the jack may be pumped up for the lifting operation. This eliminates the tedious operation of pumping to bring the jack up from its lowered position to bumper contacting position and enables the operator to raise it to this position in a minimum of time.

After the jack is raised, it will stay in raised position, the

valves

52 and 54 holding theV oil against return movement.

Such return movement is required for lowering the jack and may be accomplished by releasing means which I will now describe:

. Means is provided for by-passing the return oil past the valves 52 instead of unseating them and comprises a valve plug 66 secured to the pump cylinder 48. This plug normally seats as in Figure 2 against the lower end of the tubular piston rod 28 so as to prevent any oil leakage past this point.

The lower end of the pump piston 48, it will be noted, is threaded in a'tting I8 which connects the lower end of the tubular piston rod 28 with the lifting piston 26. l

The upper end of the pump piston '48 is provided with a head 10 having a plurality of notches 12. The operating rod 58 is provided with a head 14 having a plurality of lugs 16 adapted to enter the notches 12 when the rod 88 is radjacent its innermost position as shown in Figure 2.

Thereupon the knob 62 can be rotated for rotating the cylinder 48 and causing it to move` longitudinally downward as in Figui-e3 to open the valve lplug 86 and to engage and open the valve I4. The oiimay thereupon flow past the valve and enter the bore of the cylinder 48 through notches in the lower end thereof, and then through passages 18 (see Figure 3) and past the valve 66 and through an opening 80 to the lcylinder i8 above the piston 26 and to the reservoir 20.

By this arrangement the singleknob 82 serves both as a lifting means and as a lowering means by reciprocations and rotations respectively. The speed of lowering, of course, can be nicely governed by the degree of opening of the valves 5d and 66. Y

After the valve 54 is 0H its seat, the lugs lit of the head 14 will be meshed deeper with the notches '12 causing a pin-like extension 6d on the lower end of the piston rod 50 to move the valve 6d further from its seat. This cannot be done 'while the valve 56 is on its seat due to the pressure of oil holding the valve against its seat, but after the valve is unseated the pressure is equalized, thereby permitting a downward movement of the knob 62 to open the valve further for quick lowering without exerting undue eort to push the valve further open.

In Figure '7 I show a modified construction in which a sleeve 38a is substituted for the sleeve Sii and has a movable ring 62a provided with a lug Mia, thus providing an adjustable hook on the lifting sleeves 38a. The surface of the tube 381i is preferably slightly corrugated so as to aid in the binding action of the ring 52a on the sleeve after the ring is adjusted to the desired height thereon.

It will be noted that all operating parts of the jack are in a straight line. This produces compactness without any projecting operating parts to be interfered with by parts of the automobile, inasmuch as parts above the bumpers of automobiles are always clear.

The elongated arrangement of the jack permits a considerable range of movement, the piston 26 being movable from adjacent the head i6 to adjacent the bottom of the reservior 2t. By enlarging the cylinder I8-to form the reservoir-253 the upper end of the cylinder i8 can be extended to the maximum height yet provide sufficient capacity in the reservoir for displacement caused by the tubular piston rod 28. Theguide strips di) effectively guide the tubular lifting member 38 in its lower positions, the upper end thereof being finally guided by the reservoir 20 and capable of extending to a position thereabove whenthe jack is in its extreme raised position. The foot, being pivoted, can-be swung to the dotted position of Figure 1 when storing the jack in the tool box so as to reduce the room required for the jack to a minimum.

Some changes may be made in the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention and it is my intention to cover by my claims any modified forms oi' structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim as my invention:

1. In a bumper jack, a vertical cylinder, bumper engaging means slidable thereon and having means at the side of said cylinder forsupporting a bumper, lifting means within said cylinder and having a portion projecting above the upper end thereof, a yoke connection between said portion and said bumper engagingmeans to raise the bumper engaging means when the lifting means is operated and operating means for said lifting m'eans having a vertically reciprocable handle extending out-of the upper end of said portion.

2. In a bumper jack, a vertical cylinder, bumper engaging means slidable thereon and having means for supporting a bumper, lifting means within said cylinder and having a portion projecting above the upper end thereof, a yoke con- In a jack of the character described, a verl nection between said portion and said bumper'en-v gaging means to raise the bumper engaging means when the lifting means is operated and operating means` for said lifting-means having a vertically reciprocable handle extending out of theA upper end of said portion, means to release said lifting means to permit lowering thereof, said handle being manipulatable to operate said release means.l

`3. In a bumper jack, a vertical cylinder, a tubular element slidable thereon and having a hook projecting radially therefrom for supporting a bumper, a lifting piston within said cylinder and having a piston rod projecting above the upper end thereof, an'operative connection between said portion and said bumper engaging means to raise the means when oil is pumped to the lifting piston and a pump for so pumping oil andhaving a vertically reciprocable handle `extending above the upper end of said portion. fl. In a bumper jack, a vertical cylinder, bumper engaging means slidable thereon and having means for supporting a bumper, a lifting piston within said cylinder and havinga piston rod projecting above the upper end thereof, an operative connection between said portion and said bumper engaging means to raise the means when oil is pumped to' the lifting piston and a pump within said piston rod for so 'pumping oil, said plnnp having an' operating rod extending from the upper end of said piston rod and surmounted by an op-S erating knob.

5. In 'a bumper jack, a vertical cylinder, bumper engaging means slidable Athereon and having means for supporting a bumper, a lifting piston within said cylinder and having a piston rod proj ecting above the upper end thereof, an operative connection between said portion and said bumper engaging means to raise the means when` oil is pumpedto the lifting piston and a pump within said piston rod `for so `pumping oil, said pump having an operating rod extending from the upper end of said piston rod, release means for said calv cylinder, a -lifting member slidable longitulifting piston, said operating rod being associated therewith to operateithe release means when it is desired to permit the jack to lower. I

6. In a jack of the character described, a vertical cylinder, .a liftingm'ember slidable longitudinally relative thereto, lifting meanswlthin said cylinder and projecting thereabove, lowering means carried by said lifting means, an operative connection between the projecting part of said lifting means and said lifting member and means for operating said lifting means and said lowering means and having a handle projecting from said projecting part. l

7. vIn a jack of thecharacter described, a vertical cylinder, a lifting member slidable longitudinallyrelative thereto,.lifting' means withinsaid cylinder and-'projecting thereabove, an operative connection between the projecting part-thereof y and said lifting ,member and .a single control member for lifting and lowering said lifting means and having an operating handle projecting out 4of the top of said projecting part.

8. In a jack of the character described, a vertiv`dinally relative thereto, lifting means within said cylinder and projecting thereabove, an operative connection between the projecting part lifting and lowering said lifting means and having an operating handle projecting from said projecting part, said operating handle being reciprocable 4forlifting operations and rotatable for loweringoperations.

tical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said cylinder, said lifting'means comprising a lifting piston, a tubular pistcn rod extending upwardly therefrom and from the upp'er end of said cylinder, an' operative connection between the upper end of said tubular piston rod and said lifting I member, a pump within said tubular piston rod for pumping oilfrom the cylinder above the lifting piston to the cylinder below the lifting piston and an operating member for said pump extending from the upper end of said tubular piston rod.

10. In a jack of the character described, a vertical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said cylinder, said lifting, means comprising a lifting piston, a tubular piston rod extending upwardly therefrom and from the upper end of -said cylinder, an operative connection between the upper end of said tubular piston rod and said lifting member, a pump within said tubular piston rod for pumping'oil from the cylinder above the lifting piston to the cylinder below the lifting piston and an operating member for said pump extending from the upper end of said tubular piston rod and comprising a pump piston rod and a knob on the upper end thereof.

11. -In a jack of the lcharacter described, a vertical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said cylinder,` saidlifting means comprising a lifting piston, a tubular piston rod extending `up` wardly therefrom and out of the upper end of said' cylinder; an operative connection between the upper end of said tubular piston rod and-said lifting member, a pump within said tubular pistical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said` cylinder, said lifting meanscomprising a lifting piston, a tubular piston rod extending upwardly therefrom and from'the upper end of said cylinv der, an operative connection between the upper end of said tubular'piston rod and said lifting member, a pump within said tubular piston rod for pumping oil from the cylinder above the lifting piston to the cylinder below the lifting piston, an operating member for said pump extending from the upper end of said tubular piston rod and comprising a .pump piston rod and a knob on the upper end thereof, said pump including release lmeans to permit oil to. flow from below the lifting piston to thereabove and means to 'render said release means operative, said last means comprising an operative connection be- -tween the pump piston rod and the release means Awhereby' the release means may be operated by. I,

,Y/manipulation of said pump piston rod. Y V"rlileln a jackof the character described, a ver-l thereof and said lifting member and means for said cylinder, an operative connection'between 755 4 the upper end of said tubular piston rod and said lifting member, a pump within said tubular piston rod for pumping oil from the cylinder above rthe lifting piston to the cylinder belowthe liftto thereabove and means to render said release means operative, said last means comprising an operative connection between said pump piston rod and said release means whereby the release means may be operated by rotation of the pump piston rod.

14. In a. device of the class described, a vertical cylinder, an elongated pivoted foot on the base thereof adapted to exten-d either at right angles thereto or parallel therewith, bumper engaging means slidable thereon and having means for supportinga bumper, a lifting piston within said cylinder and having a piston rod projecting above the upper end thereof, an operative connection between said portion and said bumper engaging means to raise the means when oil is pumpe-d toA the lifting piston and a pump for so pumping oil and having a vertically reciprocable handle extending out of the upper end of said portion.

15. In a device of the class described, a vertical cylinder, a. tubular lifting member slidable thereon, a ring slidable relative to an-d bindable on said tubular lifting member and having a hook-like projection to engage an automobile bumper or the fiike, lifting means within said cylinder and projecting thereabove, an operative connection between the projecting part thereof and said lifting member and means for operating said lifting means and having a handle projecting from said projecting part.

16. In a -device of the class described, a vertical cylinder having a'n enlarged reservoir portion at its upper end, guide means below said reservoir portion of substantially the same diameter as the outside diameter of said reservoir portion, a tubular lifting member vertically slidable on said guide means an-d reservoir portion, lifting means within said cylinder comprising a lifting piston, a tubular piston rod extending upwardly at one end from the upper end of said cylinder, an operative connection between the upper end of said tubular piston rod and said lifting member, a pump within said tubular piston rod for pumping oil from the reservoir cylinder above the lifting piston to the cylinder below the lifting piston and an operating member for said pump-v extending from the upper end of said tubular piston rod.

17. In a jack of the character described, a vertical cylinder, a lifting member slidable longitudinally-relative thereto, lifting means within said cylinder, said lifting means comprising a lifting piston, a tubular piston rod extending upwardly therefrom and from the upper end of said cylinder, an operative connection between the upper end of said tubular piston rod and said lifting member, a pump within said tubular piston rod for pumping oil from the cylinder above the lifting piston to the cylinder below the lifting piston, an operating member and release means for said pump extending from the upper end of said tubular piston rod, and a coupling connection between said pump piston rod and said release means, the release means being operated upon rotation, said coupling connection being operable upon said pump piston rod being moved to one limit of its reciprocatory movement.

18. In a jack of the character described, a vertical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said cylinder, said lifting means comprising a lifting piston, a tubular piston rod extending upwardly therefrom and from the upper end of said cylinder, an operative connection between the uoper end of said tubular piston rod and said ing member, a pump within said tubular piste-1 rod for pumping o-il from the cylinder above the lifting piston to the cylinder below the lifting piston, an operating member for said pump extending from the upper end bf said tubular piston rod and comprising a pump piston rod and knob on the upper end thereof, said pump including valve means to permit, when open, oil to new from below the lifting piston to thereabove and means to open said valve means.

19. In a device of the class described, a vertical cylinder, lifting means ine-rein and projecting therefrom, a vertically reciprocable operating member for said lifting means, a lifting member slidable longitudinally on said cylinder, an operative connection between said lifting member and said lifting means and operating means for said lifting means extending out of the upper end thereof.

20. In a jack of the character' described, a vertical cylinder, a lifting member slidable longitudinally relative thereto, lifting means within said cylinder and projecting thereabove, an operative connection between the projecting part thereof and said lifting member and means for lifting and lowering said lifting means and having an operating handle projecting from said projecting part, said operating handle being movable one way for lifting operations and movable a different way for lowering operations.

vLEONARD D. NILSON.