US473002A - Cornelius f - Google Patents

Description

{No Model.)

G.F.HORNBEGK. LIFTING JACK. No. 473,002. Patented Apr. 19, 1 92.

- I 4 wvemtoz UNITED STATES. PATENT Orrioa.

CORNELIUS F. HORNBECK, OF OIVEGO, NEW YORK, ASSIGNOR OF ONE-HALF TO EDWARD D. COBURN, OF SAME PLACE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 473,002, dated Apri1'19, 1892. Application filed December 28, 1891. Serial No. 416,352. (No model.)

To all whom it may concern; desirable manner, or they may be integral Be it known that I, CORNELIUS F. HORN- with the standard, and said plates project BECK, a citizen of the United States, residing rearward to form bearings for thelever-shaft at Owego, in the county of Tioga and State of -b. The rear ends I) of these plates or bear- 55 5 New York, have invented certain new and usein gs are held rigidly in place by brace-rods b ful Improvements in Lifting-Jacks; and I do secured to the base. The lifting-bar C is arhereby declare the following to be a full, clear, ranged against the rear face of the standard, and exact description of the invention, such as and it is adapted to be reciprocated up and will enable others skilled in the art to which down-or back and forth by the lever and pawls. 6o

' to it appertains-to make and use the'same. Said lifting-bar is guided in its movement be- My invention relates to improvements in tween the bearing-plates and guide-plates D, lifting-jacks; and its object is to provide a having logs or projections 01, whichmay be simple and efiective construction and arrange provided with friction-rollers to bear against ment of part-s wherebythe lifting-bar may be the rack-bar and hold the lifting-bar in a ver-- 65 elevated or lowered by simply varying the ostical position. On the rear face of the liftcillation of the operating-lever. ing-bar a plate 0 is secured, and this plate car- Withthese ends in view my invention conries the rack-teeth c, which areintegral with sists of a standard mountedinasuitable base, said plate, the bar being separate from the a lifting-bar guided within the standard, a plate and fastened in place in a suitable man 70 2o lever-socket pivoted in bearing-plates on the ner, or the bar and rack-teeth maybe integral. standard and carrying the lifting and lowering The lever-socket E is pivotally secured on pawls, andadog pivotally secured on the bearthe shaft 12, and it is bifurcated to provide ing-plate and adapted to be operated by the the forwardly-extending side pieces 6. A lever-socket to adjust the pawls, so that the transverse bar e'is secured in the ends of the '7 5 lifting-bar may be lowered. side pieces a, and'the smaller pawl F is piv- My invention consists, further, of certain oted thereon in a suitable manner. The details of construction and arrangement of larger pawl G is pivoted on the shaft b, and parts, as will be fully describedand claimed it acts as a holding-pawl, either in the operahereinafter. tion of elevating or lowering the lifting-bar, 8o To enable others to more readilyv understand while the smaller pawl-F performs the fume my invention I have illustrated the same in tion of elevating or lowering the lifting-bar, .the accompanying drawings, in whichthe pawl G simply holding said bar while the Figure 1 is a side elevation of the improved smaller pawl F is obtaining a new hold. The jack, partly broken away. Fig. 2 is a side lever d is inserted in the socket in the usual 85 v view, partly in section, showing the'jack in manner, and the operation of elevating the position when the lifting-bar is beinglowered lifting-bar is very simple, the pawl G holding and the dog in engagement with the lug on the lifttng-bar steady while the lever is bethe larger pawl. Fig. 3 is a transverse sec ing elevated and the smaller pawl F lowered tional View on the line a: a: of Fig. 2, and Fig. to take anew hold on the lifting-bar. v oo 40 4 is a detail View. of the dog. In the operation of elevating the lifting-bar In the drawings like letters of reference de- I it must be noted that the oscillation of the note corresponding parts in the several figoperating-lever is confined within the limits ures. i necessary to operate the smaller pawl F over The frame consists, essentially,of a suitable one tooth of the rack-bar. As before stated, 5 base A,'having the socket a, in which the I can also lower the lifting bar after it is elestandard a is secured; but it is obvioust-hat vated by operating the lever (1, simply givthe standard may be supported in any other ing it a wider range of oscillation. To acsuitable manner and so arranged that the complish this important feature I provide a lifting-bar may operate horizontally, if dedog H, which is pivotallysecured on one of 100 sired. At or near the top of the standard are the bearing-plates, and extends rearwardly the plates B, which are fastened thereto in a above one of the side pieces 6 of the socket to impinge against a lug or projection h on the larger pawl G. By this construction and arrangement when the lever is lowered its full limit the side piece of the socket, being on the opposite side of the fulcrum, strikes against the dog H and raises it up until it impinges said dog as the pawl descends and releases, the pawl G so that it will fall back into engagement with the rack-bar again. The lever vent the pawl G from becoming displaced, 1

is now elevated to its highest limit and the smaller pawl F is released from its engage ment with the rack-bar by the projection 72, which slides down over the segmental upper edge of the dog and into a slot or recess h therein. The larger pawl G is now sustaining the rack-bar, and as the lever is lowered the projection h in the recess h assists in elevating the dog to its position in contact with the lug or projection h on the pawl G to release the latter fromthe rack-bar. To preprovide a stop I on one of the bearing-plates adapted to engagage with the lug or projection on said pawl.

It will be readily observed that the operation of the jack either in elevating or lower-- ing the lifting-bar is extremely simple, and by varying the oscillation of the lever the load supported on the rack-bar may be elevated or lowered.

I am aware that changes in the form and proportion of parts and details of construction can be made without departi'ng'from the spirit or sacrificing the advantages of my invention-as, forinstance, the dog'may be pivotall'y secured on either side of the bearingplates or directly to the standard, or I may use twodogs instead of one.

Having thus fully describedmy invention,

what I claim as new, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination, with a base and a standard, of a lifting-bar, a lever fulcrumed in bearings on the standard, the pawls carried by said lever and adapted to engage with the lifting-bar one above the other, the dog H, pivoted on one bearing-plate and having a slot or recess h" and adapted to be elevated to engage with a log on the larger pawl to hold it out of engagement with the lifting-bar, and the projection h on the smaller pawl, arranged to fit in said slot or recess to elevate the dog when-said pawl is raised and to disengage the dog when the pawl is lowered, substantially as described.

2. In a lifting-jack, the combination, with a base and a standard mounted thereon, of a lifting-bar, the bearing-plates on said standard, the lever fulcrumed in said bearingplates, the pawls carried by the lever, and a dog v pivoted on the bearing-plates and adapted to be'raised by the lever to engagewith'a lug on one pawl when the lever is lowered to its limit to lower the lifting-bar, substantially as described. p v

3. In a lifting-jack, the combination, with a base and a standard mounted thereon, of a lifting-bar having a rack, the bearing-plates on the standard and extending in rear thereof,

one bearing-plate and-adapted to be raised by the lever to engage with the lug on said pawl, and another lug on the smaller pawl to disengage the dog as said pawl descends, sub- I stantially as described.

In testimony whereof Iatfix my signature in presence of two witnesses.

OORNELIUS F. HORNBEOK.

VVitnessesz v WILLIAM E. ISENBERY, T. BJOAKLEY.

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