US410995A

US410995A - stewart

Info

Publication number: US410995A
Authority: US
Publication date: 1889-09-10
Anticipated expiration: 1906-09-10

Description

(No Model.)

M. A. STEWART.

LIFTING JACK.

No. 410,995. Patented Sept. 10, 1889.

UNITED STATES PATENT OFFICE.

MAJOR A. STE /VART, OF KINGSTON, INDIANA, ASSIGNOR OF ONE-HALF TO WILLIAM K. STENART, OF SAME PLACE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 410,995, dated. September 10, 1889.

Application filed July 8,1889. Serial No. 316 ,84'7. (No model.)

To all whom it may concern: block is slightly convexed, as shown at it, so

Be it known that I, MAJOR A. STEWART, a that the bearing of the cam-face of the op- 55 citizen of the United States, residing at Kin gserating -lever shall be gradual thereon, so ton, in the county of Decatur and State of that it will more readily and quickly and Indiana, have invented certain new and useeasily elevate the block as it is moved for ful Improvements in Lifting-Jacks; and I do that purpose. The front guide-piece also has herebydeclarethatthefollowing isafull,clear, its bottom convened, as shown, to prevent 60 and exact description of the same, reference any sharp corners against which the lever being had to the annexed drawings, making might come in contact, and in this way prea part of this specification, and to the letters vents wear. The lower end of the rear guideand figures of reference marked thereon. piece extends at an angle of about forty-five This invention relates to certain new and degrees, as shown, for a purpose hereinafter 65 useful improvements in lifting-jacks; and it set forth. has for its object to provide a device of this E is the operating-lever, fulcrumed on the [5 class which shall be simple, strong, and very transverse pin or bolt 2', provided with nut t",

efficient in use. and having a cam-facej, as shown. The in- The novelty in the present instance resides ner face of the handle of the lever, where it 70 in the peculiarities of construction and the joins the cam, extends therefrom at such an combinations, arrangement, and adaptation angle that as the parts are in the position of parts, all as more fully hereinafter deshown in full lines in Fig. 1 the inclined scribed, shown in the drawings, and then parlower face of the rear guide-piece is coinciticularly pointed outin the appended claim. dent therewith, and serves to cover the slot 75 The invention is clearly illustrated in the and prevent dirt from getting in and on the accompanying drawings, which, with the letcam-face of the lever. The cam-face serves :15 ters of reference marked thereon, form a part as an automatic lock to hold the parts in any of this specification, and in whichand all of their adjusted positions.

Figure 1 is a perspective view of a lifting- In order to strengthen the lifting-block O, 80 jack embodying my improvements. Fig. 2 I employ the bolts or rods m, which are passed is a like View of the parts thereof detached. through the same from the rear to the front Referring now to the details of the drawguide-pieces. In practice this construction ings by letter, A designates a suitable base has proved to form a very strong block. from which rises the post or standard B, WVhat I claim as new is 8 5 which is bifurcated vertically to provide the The lifting-jack described, consisting of space a in which the lifting-lever and block the base,the slotted standard supported there- 3 5 work. The upper ends of the bifurcations on, the operating-lever fulcrumed on said of this post are provided with a series of standard, the inner face of the handle of the shoulders Z). lever at its junction with the cam extending 90 G is the lifting-block, formed with the at substantially a right angle, as shown, and shoulders c, which are formed upon the upthe lifting-block free to move vertically in per end of the central portion or web F of the slot of the standard and formed with centhe block, which web is provided with a lontralweb having convexed lower face and with gitudinal slot (1, through which passes loosely rear and front guide-pieces, the lower edge 5 the transverse screw-threaded bolt or rod D, of the front one being convexed and the lower which passes through the bifurcations of the edge of the rear one inclined upward, subpost, and is provided upon one end with a stantially as herein shown and described, and

nut e, by means of which it is retained in for the purpose specified. place, and which provides for the ready sepa- In testimony that I claim the above I have I00 ration of the parts when occasion may rehereunto subscribed my name in the presence quire. This block is formed with the front of two witnesses. and rear guide-pieces f and g, which embrace opposite sides of the post and serve to guide Witnesses: the block and prevent sidewise movement ALMON S. CREATE, thereof. The bottom edge of the web of the GEORGE H. DUNN.

MAJOR A. STEWVART.