US784589A - Lifting-jack. - Google Patents

Description

PATBNTED MAR. 14, 1905.

W. H. OLIVER.

LIFTING JACK.

APPLICATION FILED NOV. 2a, 1903.

2 SHEETS-SHEET 1.

PATENTED MAR. 14, 1905.

W. H. OLIVER.

LIFTING JACK.

APPLICATION FILED NOV. 2a, 1903.

2 SHEETS-SHEET Patented March 14, 1905.

PATENT OFFICE.

WILLIAM H. OLIVER, OF oIIIOAso, ILLINOIS.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent N0. 784,589, dated March 14, 1905.

Application filed November 23, 1903. Serial No. 182,221.

To uZZ whom it may concern.-

Be it known that I, \VILLIAM H. OLIVER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a full, clear, and exact specification.

This invention relates to that class of lifting-jacks designed for gradually lowering as well as raising its standard by different character of movements of the operating handle or lever; and the invention has for its object to provide an improved, simple, inexpensive, and at the same time powerful lifting-jack of that character.

lVith these ends in view my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by which the said object and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings, Figure 1 is aside elevation of my improved lifting-jack, showing the handle in different positions in dotted lines. Fig. 2 is a plan section thereof on the line 2 2, Fig. 1. Fig. 3 is a detail vertical section on the line 3 3, Fig. 1. Fig. i is an enlarged perspective view of one of the pawls. Fig. 5 is a vertical section on the line 5 5, Fig. 7, with the standard and link 38 in full, showing the operating lever or handle partially elevated. Fig. 6 is a similar section of the upper portion, showing the parts in the position they assume when the lever is fully elevated; and Fig. 7 is an edge elevation looking from the left in Fig. 5.

1 is a hollow frame, which is preferably cast integrally with the base or foot 2 and is provided in one side with a vertical slot 3 and at its upper end with two upright projections 4:, on the inner faces of which are formed vertical tongues or feathers 5, which lit, respectively, in grooves 6, formed in opposite sides of a standard 7, and thereby sustain and guide the standard during its operation within the frame 1. The lower end of the standard is formed with a laterally-projecting shank 8', which extends through the slot 3 and carries a support 9, which, it will be seen, is capable of being placed very near to the foundation or base and adapts the jack for use under weights that would be too low for the support at the upper end of the standard. In order that the standard may be inserted in the frame with this additional support 9, the upper end of the slot 3 is left Open until the standard is inserted and it is then closed by a block 10, which serves the twofold purpose of limiting the upward movement of the standard by engaging the shank 8 and of supporting one of the pawl-springs 11, hereinafter. described, which is secured to the inner side of said block by any suitable rivet or bolt 12. The block is held in place by being shouldered in the side of the frame lthat is, set into a recess wider than the slot 3as better shown in Fig. 7, which rigidly holds the block against downward and lateral movement, and it is held against outward and upward movement by a cross rivet or bolt 13, which passes through side ears 14: on the frame and seats in the transverse horizontal channel 15, formed in the outer face of the block.

The opposite edges of the standard 7 are formed with teeth or notches 16 17, which are alternately engaged by two pawls 18 19, respectively, a rib 20 being cast perpendicularly across each set of teeth 16 17, to strengthen the teeth and the standard, and consequently the end of each pawl is bifurcated, so as to straddle the rib 20, as shown at 21. These pawls 18 19 are pivoted in the ends of a walking-beam or lever, which is pivotall y supported on the frame 1. This walking-beam is composed of two halves 22 23, which are pivotally supported on studs 24 25, respectively, cast on or secured to the outer faces of the vertical projections 4, thus straddling said projections and the standard 7, and in order that they may be rigidly secured together and held the proper distance apart without unduly binding the projections 4; there are formed at their ends matched bosses 26 27, which came together, as better shown in Figs. 2 and 7, and bolts or rivets 28 29 are passed through the ends of the halves 22 23. The pawls 18 19 are arranged between the halves 22 23 and also within or between the bosses 26 27, so as to be projected by the bosses 26 27, (see Figs. 5 and 6,) and each is formed and constructed, as shown in Fig. 4, with a pair of tongues 30, projecting from opposite sides and engaging in suitable bearings in the members 22 23 of the walking-beam. The inner side of the pawl is also formed with a rounded shoulder 31, located a short distance from its lower end, which is beveled or tapered, as shown at 32, and engaging with the inner siderof pawl 19 is a spring 33, which may be secured to the frame 1 in any suitable way, as by means of screw or rivet 34, the inner face of the other pawl,18, being engaged by the spring 11,which is provided at its upper end with a bend 35, serving to ride over the shoulder 31 when the pawl 18 is lowered, and thereby force the latter out of engagement with the teeth 16, as shown in Fig. 6.. When the pawl 18 is raised, the bend 35 engages the rounded or beveled portion 32, which is below the center of pivot 30, and forces the pawl into engagement with the teeth. The spring 33 is formed with two bends or undulations 36-37, the former of which acts against the projections 32 of the pawl for holding the pawl in engagement with teeth 17 when the pawl is lifted to its extreme upper movement, and when the pawl is lowered to an intermediate point in the length of its movement, as shown in Fig. 5, it engages under the shoulder 31 and holds the pawl 19 out of engagement, as shown in said figure, while at this time the spring 11 is holding pawl 18 in engagement with the teeth, as shown in said figure. If, therefore, the Walking-beam carrying these pawls be so oscillated as not to carry the pawl 19 below the position shown in Fig. 5 and is raised upwardly from this position the standard will be supported solely by the pawl 18. and consequently will descend with pawl 18 as pawl 19 ascends to engage in the notch above the notch opposite the end of pawl 18; but by the time pawl 18 reaches the extremity of its downward movement the bend 35 of spring 11 will'have engaged over shoulder 31 of pawl 18 and forced pawl 18 out of engagement with the teeth on the standard, the standard being now supported by the elevated pawl 19, which if again lowered to the position shown in Fig. 5 will bring the parts into the position shown in said figure, with the standard supported by the pawl 18 alone, ready to again descend with the latter pawl while the pawl 19 rises and skips a tooth and engages in the tooth above, as before explained. If, however, the pawl 19 be lowered to the extremity ofits downward movement, the rounded end 31 will ride outwardly over the lower bend 37, and thereby force the point of the pawl into engagement with the teeth 17, where it will remain throughout its entire upward movement and serve to lift the standard, which will be caught and supported by the pawl 18 when the pawl 19 is again low- 5 ered as soon as the parts arrive at substantially the position shown in Fig. 5. The walking-beam 22 23 may be thus oscillated for operating the device by a handle secured directly thereto, if desired; but for the sake of greater power and of bringing the operating-handle closer to the ground, where it is less liable to be obstructed in its movement by parts of the vehicle or other device being jacked up, the walking-beam is pivotally secured to theupper end of a link 38 by means of the bolt 29, and the lower end of this link is secured by pivot or bolt 39 to a lever pivoted at a low point to the framel by any suitable means, but preferably by lugs 40, cast directly on opposite sides of the frame, the distance between the fulcrum-point 40 of the lever and the work-point 39 being less than the distance between pivot 29 and the fulcrum 24 of the walking-beam, so that the leverage will be compound. This lower lever fulcrumed on the stud 40 is composed of two halves or members 41 42, embracing the frame 1 and held together by the bolt or pivot 39, which connects the lower end of link 38 9o thereto. The outer ends of the sections 41 42 are formed with a handle-socket 43, adapted to receive a handle 44, and, ifdesired, this handle may be held in place in the socket by z a cross-bolt 45, the ends of the handle being provided with perforations 46 for the passage of such bolt. Both ends of the handle 44 are bent at angles, as shown at 47 48, and these bends extend in opposite directions and their angles are different, and either end of the handle is adapted to be inserted into the bandle-socket 43. Thus it will be seen that in places where it is necessary that the fulcrum. of lever 40 be located close to the ground, but the conditions are such as to prevent the outer end of the handle being lowered to the same level, the handle may be used in the manner shown in dotted lines in the lower position, and in which position it will be capable of forcing the lever 41 42 close to the ground at the full extremity of its downward movement, while the outer end of the handle will be still above the ground with room for the fingers under it, and, in fact, that the usual position or way of attaching the handle, because in this position the standard may be either raised or lowered accordingly as the lever 41 42 is carried below the horizontal on the downward stroke, that being the level to which lever 41 42 is lowered and from which the lever begins its upward stroke when it is desired to lower the standard gradually, as before explained. If, however, it should be desired to prevent the lever 41.42 from descending below that level when lowering the standard, it is simply necessary to remove the handle 44 and turn it end for end in the way shown in full lines in Fig. l, for in this position the-angle 48 at the outer end of the handle strikes the ground or floor before the lever 41 42 descends far enough to permit the pawl 19 to engage teeth 17 until it is about to complete its upward stroke, thus allowing the standard to be lowered with the pawl 18. As the handle-socket 43 is complete without the bolt 45 the handle 44 may thus be readily interchanged, and thereby provide for the rapid operation of the jack.

In some instances the full power of the confpound levers is not necessary, and where the use to which the jack is to be put precludes the use of the handle 44 at the low elevation shown in full lines in Fig. 1 the link 38 may be detached at its upper end from the walking-beam and the end of the handle 44 inserted in its place between the outer ends of the halves 22 23 of the walking-beam, as shown in dotted lines in Fig. 1 and in full lines in Fig. 3, the handle 44 having flanges 49 along its upper and lower edges which overlap the sections 22 23, and, if desired, the bolt 29 may be then replaced through the hole 46 in the end of the handle. It will also be seen that by means of the bends at the ends of the handle the lower end of the handle, when the handle is thus attached to the walking-beam, may be situated at either a very high or very low elevation, according to the exigencies of the use to which the jack is put.

Having thus described my invention, what I claim as new therein, and desireto secure by Letters Patent, is

1. In a lifting-jack, the combination of a vertically-slotted frame, a standard inserted in said frame and provided with notches or teeth on opposite sides thereof, a support projecting from the lower end of said standard through said slot, a removable block secured to said frame and closing the upper end of said slot for engaging said support and limiting the upward movement of the standard, and a ratchet mechanism engaging said teeth for raising and lowering the standard.

2. In a lifting-jack, the combination of a vertically-slotted frame, a toothed standard inserted in said frame, a support projecting from the lower end of said standard through said slot, a removable block closing the upper end of said slot above said support and adapted to limit the upward movement of said standard, a pawl engaging the teeth of said standard for raising it, a spring secured to said block and engaging said pawl for holding it against the standard, and means for actuating said pawl.

3. In a lifting-jack, the combination of a vertically-slotted frame, astandard inserted therein, a support projecting from the lower end of said standard through said slot, a block shouldered in the upper end of said slot for limiting the upward movement of said support and a cross-bar extending through the sides of the frame and into said block for holding the block in place, and means for raising and lowering the standard.

4. In a lifting-jack, the combination of a vertically-slotted frame, a standard inserted therein, a support projecting from the lower end of said standard through said slot, a block shouldered in the frame across the upper end of said slot for limiting the upward movement of said support, and having a transverse countersink in its outer face, a bolt passing through the sides of the frame and engaging in said countersink for holding said block in place, and means for raising and lowering the standard.

5. In a lifting-jack, the combination of a hollow frame having vertical tongues on the opposed sides thereof, a toothed standard inserted in said frame between said tongues, and having vertical grooves in its opposite sides in which said tongues engage and engaging and sustaining the standard, trunnions formed on said frame at the outer sides of said tongues, a walking-beam journaled in said trunnions, and pawls journaled in the ends of said walk-v ing-beams and engaging the teeth on opposite sides of said standard for raising and lowering the latter.

6. In a lifting-jack, the combination of a frame, a toothed standard inserted therein, a walking-beam pivoted across said frame near the upper end thereof, pawls pivoted to said walking-beam for engaging the teeth of said standard, a lever pivoted to said frame at-a point below said walking-beam, and a link connecting said lever and walking-beam together.

7. In a lifting-jack, the combination of a frame, a toothed standard inserted therein, a walking-beam pivoted across the upper end of said frame, pawls pivoted in the ends of said beam and engaging opposite sides of said standard, a lever pivoted to the frame below said walking-beam and a link having its upper end pivoted to the end of the walking-beam outwardly from the pivot of one of said pawls and its lower end pivoted to said lever, the distance between the pivot at the lower end of the link and the pivot of said lever being less than the distance between the pivot of said walking-beam and the pivot of the upper end of the link.

8. In a lifting-jack, the combination of a frame, a standard inserted therein, an operating-lever having a handle socket or connection, means operatively connected with said lever for raising the standard when the lever is elevated from a position below a certain level toapolnt above said level and for lowering the standard when moved from said point downwardly to said level, and a handle adapt- 9. In a lifting-jack, the combination of a socket or connection, and said ends being bent frame, a standard inserted therein, a lever at different angles.

pivoted to the frame and having a handle socket or connection, means operatively con- WILLIAM OLIVER 5 nected With said lever for raising and loWer- Witnesses:

ing said standard, and a handle having inter- F. A. HOPKINS,

changeable ends adapted to be inserted in said M. B. .ALLSTADT.

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