US1039960A - Lifting-jack. - Google Patents

Description

H. G. KLEIN, SR. & E. R. PENROSE.

LIFTING JACK.

APPLICATION FILED .TUNE 21, 1909.

Patented Oct. 1, 1912.

INVENTOR 5: fg

WITNESSES:

UNITEDv STATES PATENT OFFICE,

HENRY C. KLEIN, SR., AND EDWARD It. PENROSE, 0F LOGANSPORT, INDIANA, ASSIGNORS TO BUDA FOUNDRY &; MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

LIFTING-JACK;

Specification of Letters Patent.

Patent-ed Oct 1, 1912.

Application led June 21, 1908. Serial No. 503,393.

To all whom 'it may concer/n: Y

Be it known that we, HENRYl C. KLEIN,

standard when they are raised tothe normal limit of their movement and thereby to avoid injury to the jack and also to safeguard the user and the load lifted from injury owing to canting of the jack relatively to the load or collapse of the jack; to provide a jack of the character described wherein the strain both upon the shell or cap and upon the standard will he equalized, that is to say wherein such strain will be borne equally by all parts of the periphery of both members in equal proportlons; to improve and simplify the construct-ion of jacks 4of the character referred to, and' to produce a jack which may be most economically produced and rapidly assembled, aswell as one whichwill have such other 'advantages as will be hereinafter disclosed.

To accomplish these objects and to attain such additional benefits as will be apparent to those who are skilled in the art to which our invention relates, we have provided a construction which is exemplified in the wcompanying drawings, wherein- Figure l is a sectional view taken vertically through a lifting jack to which our improvements are applied, such jack being shown in its fully lowered position;

Figure 1 is a similar view taken when the jack 1s at its fully raised position, and

Figures 3 and 4 are sectional views of modified forms of construction.

Referring now more particularly to Figures 1 and 2 it will be notedl that in carrying out our invention weprovide a fixed stand-y ard or support 4, preferablymade of cast steel, surrounding which is a lifting shell o'r cap 5 adapted to be moved by means of the raising and lowering screw 6 whlch has threaded engagement with the'block or nut 7 carried in the standard 4, said screw 7 being provided with proper driving means, here shown as abevel gear 8 actuated by a bevel gear 9 when power is applied thereto in the usual ma-nner. To facilitate the op eration of the jack under a load, a pair of bearing plates'l() and 11 with a ball retainer and balls 12 arel provided at the upper end of the screw 6, and the members required for the actuation of the bevel gear 8 are carried in a plate 13 mounted upon the shell 5, in a manner which in all substantial respects is well known to those who are versed in the manufacture or use of lifting jacks.

To limit the upward movement of the shell 5 relatively to the standard 4 however, we provide the shell 5 with an annular viia'nge 14 which preferably extends around the entire inner circumference ofthe shell 5, and provide the upper end of the standard 4 with a projecting collar or rim 15 to the end that when the projection 14 contacts with the collar 15, ('see Figure 2) further upward 'movement of the shell 5 and stem 6 1s prevented.

As illustrated in Figures 1 and 2, the projection 14 may be made integral with the shell 5, and the collar 15 screw threaded to the standard 4, by a screw working in a direction opposite to that of the screw 6, so that any tendency to loosen or unscrew will be avoided, though for further protection a pin as indicated at 17 may be provided.

In Figure 3 a modified form of construction in which the collar 14 has screw threaded engagement with the shell 5, instead of being made integral therewith and the collar 15a is made integral with the standard 4 instead of separable therefrom as illustrated; In this form of construction t shell may be assembled by passing the standard 4 through the shell 5, the outer cap 19 screw threaded to the shell 5 and prevented from rotation relative thereto by the set screw 20 being removed, and the foot 18 thereafter attached to the standard 4.

The operation of the lifting jack of our improved construction herewith illustrated will be obvious from a comparison of the position of the parts shown in Figures. 1

and 2.

movable with respect thereto and being internally threaded at the bottom, an externally threaded collarengaging the threaded portion of the shell and ada ted to abut the collar on the post, a remova le cap portion for closing the upper end of the shell and means for moving the shell with respect to the post.

In testimony whereof We have hereunto signed our names in thepresence of the two' subscribed witnesses.

HENRY C. KLEIN, SR. EDWARD R. PENROSE. Witnesses:

FRANK O.v JOHNSON, L.s.] ORPHA CARTER. [L. 5.]

Images