US974988A - Lifting-jack. - Google Patents

Description

R. J. NORTHAM.

LIFTING JACK.

APPLIOATION FILED MAY a, 1910.

974,988, Patented Nov. 8, 1910.

ROBERT J. Newman, or nos ANGELES, CALIFORNIA.

LIFTING-JAGK.

Specification of Letters Patent.

Patented Nov. 8, 1910.'`

Application led May 3, 1910. Serial No. 559,202.

To aZZ whom it may concern: v

Be it known that I, ROBERT J. NoR'rHAM, a citizen of the United States of America residing at Los Angeles, in the county of Los Angeles, State of California, have invented a certain new and useful Lifting- Jack; 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 appertains to make and use the same. l

This inventifiirelates to lifting jacks and particularly to the means for operating the same; devices constructed according to this invention being especially adapted to be used in jackin up automobiles or other vehicles,

though t ey may be used equally well in lifting other heav objects.

One object of t e invention is to provide a device of the character specified which is compact and easily portable and capable of being stored in a small space and yet permits of the operating means being placed ata distance from the jack proper when the device is in use.

With the above and other objects and advantages in view, which will be apparent to those skilled in the art from a consideration of the following description and accompanying drawings in which one form of construction embodying the invention is described and illustrated, the invention may be said to consist of the construction, arrangement and-combination of arts hereinafter described and set forth 1n the appended claims.

Referring now to the dra-wings: Figure 1 is a plan view of a device embodying the invention. Fig. 2 is a sectional elevation thereof. Fig. 3 is a horizontal sectional view taken on line 3-3 Fig. 2. Fig. 4 is a horizontal sectional view taken on line 4 4 Fig. 2. Fig. 5 is an enlarged detail section taken on line 5 5 Fig 3. Fig. 6 is an enlarged detail section taken on line 6*-6 Fig. 3 and Fig. 7 is a detail section taken on line 7 7 Fig. 5.

The jackproper is preferably constructed to be operated hydraulically; as here shown comprising a cylinder 1 mounted on a base 3 and contalning a piston 4. A piston rod 5 is secured topiston 4 and projects upwardly through the top 6 of the cylinder, this piston rod being preferably provided with' a cap 7 on -Which an object being raised by the device is adapted to rest.

Liquid under pressure ma be su plied to cylinder 1 through a pre tip erably exible tube 8 which may be of any desired length raised may be drawn from a reservoir 12. v

To make the device compact this reservoir is preferably mounted as shown on the base 11 to inclose the pump cylinder 10; the reservoir being preferably of 'cylindrical formation and provided with a cap or cover 12. Bolts 12 passing through the cover 12 and threaded into the base 11 may be used to secure the reservoir to the base 11, the latter forming the bottom of the reservoir. Connection between the cylinder 10 and reservoir 12 is effected by means of a conduit 13 controlled by a one-way valve 14 while connection between the cylinder and tube 8 is effected by means of a conduit 15 controlled by a one-way valve 16.' A perforated plug 14 prevents the valve 14 from being drawn up into the cylinder on the upward stroke of the pump plunger.

The advantage of the foregoing arrangement of parts will be apparentjas it will be readily seen that the device will be compact and easily carried about While at the same time it will greatly facilitatethe jacking up 0f an object which is difficult of access, such as axle of an automobile, as the pump can be set in any convenient place while being operated.

The pum plunger 17 may be operated by means o a lever 18. This lever 1s. preferably fulcrumed on a link 19 which 1s plvoted as at 20 to a projection on cover 12 and it may be provided with a removable han-V dle 21 fitting over the end 22 of the lever.

A Vby-pass 23 leading from' conduit 15 to the reservoir 12 may be provided to permit of the return of the liquid to the reservoir 12 when the jack is lowered. Connection between the by-pass and the reservoir may be controlled by suitable means as by the valve 24, the stem 25 whereof is elongated and threaded into the lower end of a sleeve 26 swiveled in the cover 12. Rotation of the sleeve 26 to open or close valve 24 may be effected by means of a ring 27 encircling the latter above the cover and provided with a handle 28; the ring being keyed to the sleeve as indicated at 29. A nut screwed upon the end of the sleeve and bearing algainst the ring 27 secures the ring and s eeve to the cover as will be readily understood by referring to Fig. 5 of the drawings. A washer 31 may be provided t0 make a liquid-tight joint between the sleeve and the cover 12'; the nut 30 being screwed up suiiciently to make a snug fit between the arts without preventing rotation of the s eeve and ring.

To hold valve 24 in alinement with the by-pass 23 which opens into the cylinder 10 from a boss 33 on the base 11, the stem 25 has near its lower end a lspider 32 which slides in the enlarged inner end 34 of the bypass, while lugs 35 bearing in slots 36 in boss 33 keep the valve stem from rotating with sleeve 26 when the latter isactuated by handle 28.

` rin Communication between the upper part of the reservoir and the` outside air may'be effected by means of a conduit 37 leading from the reservoir through sleeve 26l and- 27. A valve 38, the stem whereof isl liquid in the reservoir escaping therefrom when the device is not in use. l

In case it should be desired to raise an object the space underneath which is not of sufficient height to permit of theV cap 7 being inserted thereunder, a supplementary device 45, the top 46 of which fits over the cap 7,

j be raised; while friction between the device may be provided. TheY lower end of the device 1s provided with a projecting step 47 which may be inserted under the object to and the cylinder when the piston is being raised may beprevented by any suitable means as the roller 48.

As shown articularly in Figs. 1 and 4', the base mem ers 3 and 11 may be recessed on their under sides and formed with oppo-4 sitely disposed inwardly Vprojecting lugs 49 through which the jack and pump may be secured when not in use to base- plates 50 and 51, these base-plates being fastened by screws 52 or in any suitable way-to a stationary part indicated at 53, suoli as the foot-board of an automobile; the base- plates 50 and 51 being formed with outwardly projecting lugs 54 under which the lugs 49 are adapted to engage-this connection beine` substantially a bayonet-joint connection and the manner of securing the pump and. jack to the base-plates by placing them over the latter and giving them a partial turn will -be readily understood. The lugs 49 and 54 are preferably slightly beveled circumferentially as indicated at 55 to allow of the pump and jack being secured irmly in place.

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Any suitable means, as the stop cock 56 operated by the handle 57 may be rovided to` retain the liquid in cylinder 1 an relieve the strain" on the flexible tubing 8 in case it should be desirable vto leave the jack for a length of time with the piston raised and a weight bearing u on it. An opening 57 havin a removab e cover 58 may be provided in the cover 12.

When it is desired to use the device, the jack roper is placed under the object to be raised, the pump being arranged in any convenient place. Upon reci rocation of the lever 18 the 1i uidwill be awn from reservoir 12 throu conduit 13 into cylinder 10 and from cy inder 10 the li uid will be forced through conduit 15 an tube 8 into cylinder 1, thus raising piston 4. When it is desired to lower the object the same is accomplished by opening valve 24 when the liquid will return to the reservoir 12 through by-pass 23.

Although one' form of construction in which the invention may be vembodied has been illustrated and described it is obvious that -various changes and modifications might be made therein and the-ri ht is reserved to all'such changes and mo ifications invention. y I claim:

1. In combination, a pulnp cylinder, a v

base on which the cylinder is mounted,`said base having a slotted projection thereon, a reservoir mounted on said base and inclosing the cylinder, a valve controlled conduit leading from the reservoir to the cylinder, a second valve controlled conduit leading away from the cylinder, a by-pass leading from thesecond mentioned conduit to the reservoir, a valve controlling said by-pass, a stem for operating the valve, a spider formed on the stem, near itslower end to keep the valve in alinement with the bypass, a sleeve rotatably mounted on the cover of the reservoir and threaded into the upper end of the valve-stem, a ring encircling the sleeve and keyed thereto, a nut threaded onto the upper end `of the sleeve and bearing avainst the-ring, a handle on the rino' where y the ring and sleeve may be rotate and means for preventing rotation of the valve stem when the sleeve is rotated, including a lug formed on the stem and bearing in the slotted projection on the base.

2. In ,a device of the classspecified, in combination, a pump cylinder, a reservoir inclosing the cylinder, a valve controlled conduit leading from the reservoir to the cylinder, a second valve controlled conduit leading away from the cylinder, a by-pass leading from the second conduit to the reservoir, a valve for the by-pass, means to actuate the valve including a sleeve rotatively mounted in the cover of the reservoir,

said sleeve provided with a passage leading in the county of Los Angeles, State of Califrom the upper part of the reservoir to the fox-nia, this 28th day of April A. D. 1910. outer air, a valve in the sleeve operable to close the passageway. v ROBERT J' NORTHAM 5 In testimony whereof, I have signed my Witnesses:

name to this specification in the presence of ALEX. H. LIDDERS,

tWo subscribing Witnesses at Los Angeles, I ALEX CURRIE.

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