US1376511A - Lifting-jack - Google Patents

Description

G. J. CAMPBELL.

LIFTING JACK.

APPLICAT ION FILED DEC. 71 1920.

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' LIFTING JACK.

APPLICATION Fl'LED DEC. 7, I920.

Patented May 3, 1921.

2 SHEETS-SHEET 2- 33mm George J 62019064! I Qflurmgi UNITED STATES PATENT OFFICE.

GEORGE J. CAMPBELL, OF POUGHKEEPSIE, NEW YORK, ASSIGNOR TO LANE BROTHERS COMPANY, OF POUGHKEEPSIE, NEW YORK, A JOINT-STOCK ASSO- CIATION OF NEW YORK.

LIFTING-JACK.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed December 7, 1920. Serial No. 428,911.

To all whom it may concern:

Be it known that I, GEORGE J. CAMPBELL, a citizen of the United States, and a resident of Poughkeepsie, New York, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

My present invention relates to improvements in lifting jacks of the step up and step down type and more articularly t0 the form of jack shown in etters Patent of the United States, No. 1,181,395, granted to George Lane, on the 2nd day of May, 1916, said patent disclosing a jack in which the raising or lowering of the jack is controlled by a shifting of the handle bar in the socket of the actuating lever. In the said patented construction, the handle bar was positively locked or held in the socket by a dog or pawl which, while permitting the relative movement necessary to reverse the jack, yet prevented its complete removal, whereby the handle bar was capable of being used for the purpose of placing the jack in operative position and effecting its subsequent removal; and in order to completely remove the handle, it was necessary to manipulate the dog or pawl.

The present invention aims to provide a construction in which the handle will be so held-in the socket member as to enable the relative shifting movement to be imparted thereto while so held to effect the reversal of the jack and in which the handle bar will be retained in the socket with suficient permanency to enable the jack to be manipulated by the use of the handle and yet enable the handle bar to be removed from the socket by a direct pull, thus avoiding the necessity of any manipulation of a separate retaining awl. 1 p To this end the invention includes the novel features of construction and arrangement and combination of parts hereinafter described, the said invention being defined by the claims appended hereto.

Several forms of my invention are illustrated in the accompanying drawings, in which- Figure 1 is a side elevation with parts broken away showing a sufficient portion of a jack to illustrate the invention,

Fig. 2 is it sectional detail,

Fi 3 is a View similar to Fig. 2, showing a di erent position of the handle bar in the socket.

F ig'. 41 is a perspective view of the end of the handle bar.

Fig. 5 is a view similar to Fig. 41 but showin a modified form of spring 1 through the handle bar of Fig. 5 and a socket lever or member modified to coact therewith.

Fig. 7 is a section on looking in the direction Fig. 8 is a perspective View showing a modified form of spring attachment.

Fig. 9 is a sectional elevation of a further modification, and Figs. 10 and 11 are detail views illustrating a rotary handle.

Referring by reference characters to these drawings, the numeral 2 designates the standard and 3 the lifting bar guided there in, being actuated by the lifting or lowering pawl 5 cooperating with a holding or retaining pawl 4, the former being pivoted on the actuating lever or member 6, and the latter on a fixed pivot carried by the standard.

The pawls are shown as connected by the close coiled springs 13 and 141 to the bell crank levers 11 and 12, pivotally supported from the standard and being under the tension of the common spring C.

Action of the bell crank levers and pawls will be readily understood by those skilled in the art, it being understood that when the inner ends of the shoulders 11 and 12 are unobstructed, the operation of the lever or actuating member 6 effects an upward step by step movement of the lifting bar, while when the movement of said ends or shoulders is alternately obstructed, a step by step lowering of the bar takes place, the obstruction being accomplished by the spring-pressed cross bar 21. The handle bar is shown at 7 and it will be understood that when this handle bar is pushed into the socket to its furthest extent, as shown in Fig. 3, the obstructing cross bar 21 will be carried forward against the tension of its spring 22 into the position shown in dotted lines in Fig. 1, where it will be out of position to contact with the shoulders 11 and 12*. In this position of the parts, the up and down movement of the handle bar will ra se the lifting line 7-7 of Fig. 6 of the arrow.

' down movement of the handle bar.

bar 3 in a manner well understood by those familiar with this type of jack. However, when the handle bar is shifted backwardly to a slightextent (as indicated in Fig. 2), while held in the socket, the contact bar 21 is allowed to assume the position indicated in full lines in Fig. 1 under the action of its spring 22 whereby it will contact alternately with the shoulders 11 and 12 of the bell cranks and so control the action of the pawls as to effect the step by step lowering of the 'ack.

3 One form of meansby which the handle bar 7 is held in the socket so as to be shiftable to either of the two positions required, in a-man'norto enable it to be used for placing and removing the jack andyet to be removable from the socket member by a direct pull, is shown in Figs. 1 to 4. inclusive. In this form I interposebetween'the handle bar and the wall of the socket a friction member, preferably in'the form'of' a spring 8 carried by the side of the handle lever, to which it is secured by suitable means, such as a rivet 9,

the free portion of the spring tending to press against the wall of the socket. This spring exerts sufficient pressure against the wall of the socket to retain the handle bar against accidental displacement or removal in the manipulation of the j ack, as, for instance, the placing of the jack under the axle of the car or its removal or during the up and It will be obvious that with spring friction means such as described, the handle bar may be shifted int-he socket to either of the two positions desired to control the vertical movement ofthe lifting bar, merely by the application of sufficient force to overcome the friction of the spring, and similarly the handle bar may be completely removed from the socket by an additional direct line pull.

I prefer to recess the handle bar as shown, to.

receive-the 'spri'ng,-the bend projecting beyond the walls of the recess.

In Fig. 5, I have shown the frictional retaining spring 8" as designed to retard the movement of the handle bar in its socket when the lowering position is reached, while yet being capable of automatic yielding under further and harder pull to permit the removal of the handle bar. This is accomplished by providing the spring with abend a which cooperateswith a rib 6 on the wall of the socket, this bend terminating at the outer end in a notch or recess a with an inclined shoulder a which'is more abruptthan the opposite wall of said recess a. The spring would yield with comparative ease under the action of the rib or flangefi under a push or pull to shiftthe' handlebar in the socket but when the handle bar is pulled outwardly from its in'nermost or lifting position the engagement of the rib or flange in the spring recess'a will automatically stop further movement of the handle at lowering position, although the handle may thereafter be removed by a harder direct pull.

It is obvious-that the spring maybe set into a recess in the side of the handle bar, as shown in Figs. 4 and 5, or that it may be secured to the unrecessed face of the handle bar, as shown at 8 in Fig. 8, in which event the socket would have to be correspondingly shaped.

Instead of placing the spring at the side of the handle bar as in the preceding forms, I may place it on the bottom of the socket member, as shown at 8 and provide it with a bend m of reverse V-shape forming in effect a shoulder or lug which projects through an opening in the socket member and cooperates with reversed V-shaped notches Win the lower edge of the handle bar, as shown in Fig. 9, the inclined walls'of which permit the handle bar to be shifted in the socket to either of two determined positions'or pulled completely out by a direct push'or pull.

It will be understood that this invention pertains only to the movement, holding and control of the jack handle in the lever socket, and while illustrated in connection with jack mechanism as shown in Patent #1181395, it is equally applicable to any other mechanism where'reversal of the jack is effected by shifting the position of the handle in the socket.

Instead of shifting the handlebar longitudinally in the socket to effect the control or reversal of the jack theymay be accomplished by a rotary movement as illustrated in Figs. 10 and 11-, in which the handle W is mounted to have a rotary movement in the socket 6 which is of cylindrical shape to receive the cylindrical end of the handle bar. The handle bar has a substantially V-shaped notch sin its end in which the member 21 lies in one position of the handle bar (the lowering position, for example) while a substantially quarter turn of the handle bar causes member 21 to be forced out of the notch or recess by the cam action of the walls, thus shifting said member 21 to raising position.

The handle bar has a transversely disposed elongated slot 7 which is engaged by a wedge shaped member-or dog 18 carried by the spring 8 and projecting through an opening in the socketmember, said spring forcing the dog into the slot and the partsare preferably so constructed and arranged that the inclined faces of the dog friction'ally engage the edges or walls of the slot, so that the handle baris frictionally retained in either position to which it may be adjusted, though turnabl eumder the application of sufiic'ient pressure to overcome the friction.

When it is desired to remove the handle a direct outward pull of 'sufiicient' force will cause the dog to be forced outward by reason of its inclined face, thus permitting ready removal of the handle.

I claim:

1. A lifting jack comprising a standard, a lifting bar movably guided thereby, mechanism for moving the bar upward and downward, said mechanism including a rocking member having a socket, a hand lever having an end detachably held in said socket to have relative movement therein while soheld, means controlled by said relative movement of the hand lever to determine whether said mechanism shall raise or lower the lifting bar, and frictional restraining means interposed between the handle bar and the socket.

2. A lifting jack comprising a standard, a lifting bar movably guided thereby, mech anism for moving the bar upward and downward, said mechanism including a rocking member having a socket, a hand lever having an end detachably held in said socket to have relative movement therein while so held, means controlled by said relative movement of the hand lever to determine whether said mechanism shall raise or lower the lifting bar, said socket and said hand lever having frictional engaging means comprising a spring carried by one part and frictionally engaging the other art. p 3. A lifting jack comprising a standard, a lifting bar movably guided thereby, mechanism for moving the bar upward and downward, said mechanism including a rocking member having a socket, a hand lever having an end detachably held in said socket to have relative movement therein while so held, means controlled by said relative movement of the hand lever to determine whether said mechanism shall raise or lower the lifting bar, a leaf spring having one end secured to one face of the actuating handle and having a bend or swell terminating toward the free end of the spring in an inclined shoulder, and a rib or projection on the socket wall cooperating with said bend and shoulder.

4:. In a lifting and lowering jack in which the control of the jack is effected by the position of the handle bar in the socket of the actuating member, means for releasably holding and positioning the handle bar in the socket member comprising a leaf spring carried by one of said parts and having a curved portion or bend terminating at its base at one end in an inclined shoulder, and a rib on the other part cooperating with said bend and inclined shoulder.

5. In a lifting and lowering jack in which the control of the jack is effected by the position of the handle bar in the socket of the actuating member, means for releasably holding and positioning the handle bar in the socket member comprising a leaf spring carried by one of said parts, and

' having a bend cooperating with a shoulder on the other part.

In testimony whereof I afiix my signature.

GEORGE J. CAMPBELL.

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