US1388836A

US1388836A - A corpora

Info

Publication number: US1388836A
Authority: US
Publication date: 1921-08-23
Anticipated expiration: 1938-08-23

Description

C. W. RIPSCH, J. C. DAWLEY AND C. D. DERBY.

LIFTING JACK FOR TRUCKS.

APPLICATION FILED' FEB. 2. I92o.

Patented Aug. 2", 1921.

I N VEN TORS CMwafs nl Pf/sdf ATTORNEY c. w. RIPSCH, J. C. DAWLEY.AND c. D. DERBY.

LIFTNG JACK FOR TRUCKS. APPLlcATLoN ruin fm2. 1920.

ATTORNEY abling the jack to be reversed without'the UNITED ,STATES PATENT OFFICE.

" GHARLESWVRIPSCH, JAMES 0.,DAWLEY, AND cnn-3DES D. DERBY, or DAYTON, omo,

ASSIGNORS TO THE JOYCE-CRIDLAND COMPANY, OF DAYTON, OHIO, A. CORPORA- 'HON 03,0310- To all iol-tom t may concern-x Dayton, ini` the countyl of Montgomery and State of Ohio, have invented certain new and useful Improvementsv in Lifting-Jacks for Trucks, of which the following isa specifcation, reference being had therein to the 10 accompanying drawing.

with trucks, or similar vehicles. l

The object of the invention is to provide a simple, efficient jack which maybe easily operated under all conditions of service.

A further object is to provide a jaclrof fthis lrindwith means controlled bythe V0p- 'erating lever for reversing the direction of movement of the lifting element, thus ennecessity of thefoperator reaching or crawlingunder the'load to operate the reversing device. v p v l i p It is alsoan obj ect of the invention to provide a' jack of this kindwith a load engaging part whichis movably connected with the lifting element so that .the lifting element when inv its lowermost position 'can be brought into operativerelation to loads at different heights, thus enabling the jack to be applied to either the front orrear axle of 'a truck when these axles are, of different heights, as when lthe front vwheels vare equipped with solid tires andthe rear wheels with pneumatic tires.l p l K,

Other objects'of the invention will appear as the mechanism is describedin detail.

the accompanying drawings'Figure l is atop plan view of a jack embodying my inventionyFig. 2 is `a side elevation of the same, partly broken away; Fig. 3 is a front elevation of the same Fig. 4 is a transverse sectional`,view,takenron the line'4-"4 of Fig. 45,

2 showingV the pawlcontrolling means in a neutralrvposition; Figgj 'is a perspective view, partlyfbroken away, Aof the operating Y mechanism, showing the flowering pawl in itsinopera'tive position; and Fig. 6 is a section on the line 6 6 of Fig.` 2.

l Y Injcarrying out the invention we provid --a ack in which the lifting element is operated by -ajratchet wheel with which cooperates a pawl, or pawls, which maybe ad- `justed to movethe lifting element .in either LIFTING-JAGK FOR TRUCKS.

Speccaton of Letters Patent. Patgnted Aug, 23, 1921, Alipiieation mea February 2, v1920. semi 110.355,71.

direction. The operating lever is so ary i Be it known that we, CHARMS W, RirsoH, J JAMES C. DAWLEY, and CHARLES D. DERBY, `citizens of the United States, Yresidingat'y ver, when in its operative position, is locked tothe jack structure and may be lused as a handle to facilitate the positioning of the Jack. The lifting element is provided with p 1 a load kengaging part which is movable rela? This invention relates to lifting Jacks and more particularly to a Jackdesigned for use f tivelythereto. to enable the lifting element to be brought into operative relation with j the load at different heights, while the lifting element is in its lowermost position,

and to. thereby enable thejaclr to engage loads. at dierent distances from the ground without decreasing the scope of the lifting action of the jack. The invention may be embodied in structures of various kinds and Vit will be understood that the .particular jack here illustrated has been chosen for the purposes of illustration only. y

In the particular form of the Ainvention here illustrated the jack comprises a base l.

a nut to receive a second screw 6, and this second screw is provided at its uppei` end with a load engaging part, or cap, 7. To operate the jack rotatory movement is iniparted to the outer screw 4 and inasmuch as the threads of the two screws are arranged in different directions it will be apparent that the rotation of this outer screw will notl only move the same vertically relatively to the standard 2 but will also cause the inner screw to move vertically relatively to the outer screw. Rotation may he imparted to the outer screw 4 in any suitable manner but preferably'pawl and ratchet, mechanism is employed fcrthis purpose: "ln the present instance a ratchet wheel 8 is rigidly secured to the screw 4 and is arranged in a substantially horizontal position. A pawl,. or pawls, coperate with this ratchetv wheel to rotate the same and the pawls are in turn operated by a suitably operating member. In the present construction we have embodied two pawls, 9 and 10, and these pawls Yare mounted in laterally extending guidev lso ways or housings, 11 projecting in opposite directions from a lever socket 12. This lever socket, or pawl supporting structure, is mounted for rotation about the axis of the screw 1 and is preferably provided with collars 13 which extend about the screw above and below the ratchet wheel 8 and are free to rotate thereon, it being noted that the upper end portion of the screw 1 is without threads. The pawls may be of any suitable character but in the construction here shown they are cylindrical in shape and have their sides adjacent to the ratchet wheel beveled to engage the teeth of the ratchet wheel. As here shown, the teeth of the ratchet wheel and the pawls are V-shaped so that each pawl will operate upon the ratchet wheel with equal facility. The pawls are held normally in their innermost, or operative, positions by means of springs 111 confined between the outer ends thereof and end plates 15 mounted in the ends of the guideways, or housings, 11. Because of the curved shape of the pawls and their guideways, the pawls areA capable of movement about their longitudinal axes and will therefore automatically aline themselves with the teeth of the ratchet wheel and thus cause the teeth of the pawl to have a full bearing upon the teeth of the ratchet wheel. rlhe pawls are held in proper positions to engage the ratchet wheel bv means of pins .16 which extend through guide slots 117 in the walls of the housings 11, but these slots are of sufficiently greater width than the diameter of the pins to permit of sutlicient rotatory movement of the pawls to enable them to Valine themselves with the teeth of the ratchet wheel. Preferably the outer end of each pin projects beyond the outer wall of the housing and forms a finger piece by means of which the pawl may be manually retracted. i

The lever socket 12 is adapted to receive an operating lever, or bar, 17 which is removably mounted therein, and it will be noted that the lever and the pawl and ratchet mechanism are so arranged that thc lever will be moved in substantially a horizontal plane, thus enabling the j ack to be operated under conditions of the load or ground which would render difficult the manipulation of a. 'vertically movable lever. ln order to permit the pawls to be reversed when it is desired to lower the load without the necessity of thcoperator reaching or crawling. under the load to operate the reversing mechanism we have provided means whereby this reversal may be accomplished from a point more or less remote from the jack itself. To accomplish this the lever 17 is rotatable in the socket 12 and is adapted for connection with either pawl to move that pawl into its-inoperative position. ln the present construction the lever is provided on vpositions of the pawls.

its inner end with an eccentric pin, or stud, 18 which lies between the inner ends of the two pawls and may be brought into operative engagement with either of them by the rotation of the lever about its horizontal axis. rlhe outer portion of the-lever socket 12 is provided with an internal groove 19 and a slot 20 leading from the outer end of the socket to the groove and preferably arranged approximately midway between the ends of the groove. A pin 21 is mounted in the lever and arranged to enter the groove 19 through the slot 20. The position of the pin 21 with relation to the eccentric stud 18 is such that the pin can only enter the slot 20 when the stud is in its central, or neutral, position, that is, when it is in line with the spacebetween the ends of the two pawls. When the lever has been so inserted in the socket and is rotated in one direction or the other, to render one pawl or the other inoperative, the pin 21 will be moved out of alinement with the slot 20 and the lever will be locked in the socket. The ends of the internal groove 19l are so arranged that they will check the movement of the lever when the stud 18 is in a position to render inoperative that pawl with which it is in engagement. The lever 17 may be provided withmarkings of some sort to. indicate the As here shown,'the lever has its `outer end curved to constitute a pinch bar, as shown at 32, and the eccentric stud 18 is so arranged with relation to this curved end of the lever, that when the stud 18 is in a vposition to render the lowering pawl inoperative the curved end of the lever will extend upwardly and when the stud is in a position to render the lifting pawl inoperative the curved end of the lever will extend downwardly. By locking the lever in its socket 12 we are enabled to utilize the lever to shift the position of the j ack when the latter is being placed in position and to thus greatly facilitate this operation.

lt not infrequently happens, particularly in comiection with trucks and the like, that the parts which are to be engaged by the j ack are at different distances from the ground, and a jack which is low enough to go under the lower part must be extended more or less in order to engage the higher part, consequentlyy the distance which the higher part canbe moved by the jack is correspondingly restricted. This is especially true in trucks in which the front wheels are equipped with solid tires and the rear wheels with pneumatic tires of large diameter. In orderto'provideca single jack `which will operate under either axle and vin its lowermost position to be brought into operative relation with the higher axle, or

otherparts which is to be engaged. Preferably this movable load engaging part is of a supplemental character and is provided in addition to the usual load engaging part 7. As here shown, the movable load engaging part is in the form of a block, or head, 22 which is movably .connected with the inner screw 6 in such a manner that it may be moved into and out of alinement therewith. Preferably the second, or supplemental, load engaging part is pivotally connected to the first, or main, load engaging part 7 and as here shown it is provided with pivot lugs 23 which embrace a lug 24 extending laterally from the loadengaging part, or cap, 7 and are secured thereto by a pivot pin 25. Cooperating

lugs

26 and 27 serve to limit thel downward movement of the movable load engaging part. 'When the load engagving part 22 is in its operative, or upright,

position it rests upon the load engaging part 7 and constitutes an vextension thereof. The load engaging part, or cap, 7 Vis provided with an annular fiange 28 which forms a seat to receive the reduced lower end portion of the part 22 and to hold the part 22 against lateral strains. To hold the part 22 against any tendency to turn' about a longitudinal axis relatively to the part 7, the latter is provided with a; transverse groove 3() into which projects a rib 3l rigidly secured to and preferably formed integral with the vlower end ofthe movable part 22. yIt will be apparent that when the jack is to be applied to a low part, such as a front axle, the movable load engagingpart isrswung to one side and will then occupy a position in which it will 'in no way Vinterfere with the operation of the jack. When the jack is to be applied to a yhigher part, such as a rear axle, the movable part 22 is moved into its upright position, in which it rests upon the lower part 7, and this movable part is then brought into operative relation with the part to be lifted. The cap 7 is attached to the inner'screw 6 by extending the reduced upper end of that screw through an opening in the cap, which opening is countersunk at its upper end to permit the end of the screw to be upset or riveted to the'cap. To hold the cap firmly against rotation on the screw we have provided the countersunk opening therein with a plurality of grooves or notches 33 into which projections from the end ofthe screwl will be forced by the upsetting or expandingI thereof, thus forming a rigid nonrotatable connection between the two parts.

While we have shown and described one embodiment of our invention we wish it to be understood that we do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

l. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a pawl to coperate with said ratchet wheel, a lever operatively connected with said pawl, and a part rigidly secured to said lever and arranged to move said pawl into an inoperative position when said lever is moved about itslongitudinal axis.

2. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a pair of independently movable pawls to cooperate with said ratchet wheel to respectively move the-same in opposite directions,

a lever to actuate said pawls, and meansA controlled by rotation of said lever to move one of said pawls into an inoperative position. 3. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connectedwith said lifting element, of a pair ofpawls to coperate with said ratchet wheel to respectively move the same in opposite directions, a lever to actuate said pawls and mounted for rotation about a longitudinal axis, and means carried by said lever to engage one of said pawls andmove the same into an inoperative position when said lever is moved about said longitudinal axis. g

4. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a pair of pawls to coperate with said ratchet wheel to respectively move the same in opposite directions, a lever to actuate said pawls and mounted for rotation about a longitudinal axis, a part rigidly secured to said lever to engage one of said pawls and move the same into an inoperative position when said lever is moved about its longitudinal axis.

5. In a lifting j ack,'the` combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a pair of pawls to coperate with said ratchet Wheel, springs tending to movey said pawls one toward the other to cause them to operatively engage said ratchet wheel, a lever to operate said'pawls, said lever being capable of rotation about a longitudinal axis, and a part actuated by said lever toengage -one of said pawls'and move it out of engagement with said ratchet wheel.

v6. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a pair of opposed pavvls having their inner ends spaced apart, springs to move said pavvls one toward the other to cause them respectively to engage said ratchet Wheel, a lever to operate said paivls, said lever being capable of rotation about a longitudinal axis, and a part carried by said lever and extending between the inner ends of said pavvls and arranged to engage one of said pavvls to move the same into an inoperative position when the lever is rotated about a longitudinal axis.

7. In a lifting j ack, the combination With a base,a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a lever socket mounted for rotation about the axis of said ratchet Wheel, a pavvl mounted on said lever socket and held normally in engagement with said ratchet Wheel, a lever mounted Within said socket for rotation relatively thereto, and a part actuated by the rotation of said lever to move said paivl into an inoperative position.

8. In a lifting jack, the combination With a base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected With said lifting element, of a structure mounted for rotation about the axis of said ratchet Wheel and comprising a lever socket, and guideways extending laterally from said lever socket, paivls mounted in said guideivays and held normally iu .engagement with said ratchet Wheel, and means actuated by the rotation of said lever to move one of said pavvls into its inopera tive osition.

9. n a lifting jack, the combination with Va base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a. structure mounted for rotation about the axis of said ratchet Wheel and comprising a lever socket and guideivays extending laterally in opposite directions from said socket, pawls slidably mounted in said guide- Ways, springs for moving said paWls one toward the other to cause them to respectively engage said ratchet Wheel, a lever rotatably mounted in said socket, and a stud eccentrically mounted on the end of said lever and projecting between the adjacent ends of said paWls to move one or the other of said pawls into an inoperative position When said lever is rotated in said socket.

10. 1n a lifting jack, the combination with a base, a lifting element movably mounted on said base, a ratchet Wheel operatively connected With said lifting element, and a lever socket movable about the axis of said ratchet Wheel, of a pair of pawls slidably mounted on said socket to respectively move Lacasse said ratchet Wheel in opposite directions, a lever rotatably mounted in said socket, and means actuated by the rotation of said lever to move one of said paivls out of engagement with said ratchet Wheel.

11. In a lifting jack, the combination With a base, a liftingelement mounted on said base, and pawl and ratchet mechanism to move said lifting element in either direction, of an operating lever for said paWl and ratchet mechanism capable of rotatory movement, and a part carried by said lever and arranged to reverse said pavvl and ratchet mechanism when rotatory movement is imparted to said lever.

12. In a lifting jack, the combination with a base, a lifting element movably mounted on said base and a ratchet Wheel operatively .connected with said lifting element, of a lever socket mounted for movement about the axis of said ratchet Wheel, guideways carried by said lever socket, parvis slidab'ly mounted in the respective guideways to cooperate With said ratchet Wheel, said paivls being capable of movement about their longitudinal axes to aline the same With the teeth of said ratchet Wheel, a lever mounted in said socket andcapable of rotatory movement therein, and a part actuated by the rctation of said lever to control the positions of said parvls. l

13. 1n a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a lever socket mounted for movement about the axis of said ratchet wheel, cylindrical guideways extending` laterally from the opposite sides of said socket, payvls in said cylindrical o'uideivays having vteeth to engage said ratchet Wheel, a lever rotatably mounted in said socket, and means actuated by the rotation of said lever for controlling the positions of said pavvls.

14;. ln a lifting jack, the combination with a base, a lifting` element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a lever socket mounted for rotation about the axis of said ratchet Wheel, cylindrical guide- Ways extending laterally from the opposite sides of said socket and each having a longitudinal slot therein, paivls mounted in the respective guidevvays and having teeth to coperate with the kteeth of said ratchet Wheel, pins carried by said paivls and projecting through the respective slots, said pins having a diameter less than the Width of said slots, springs acting on the respective pavvls to move the same into engage ment with said ratchet Wheel, and means for retaining a selected pawl in an inoperative position.

15. In a lifting j ack, the combination With a base, a lifting element movably mounted Y on said base, and a ratchet wheel operatively connected with said lifting element, of a' coperate With the teeth of said ratchet Wheel, pins carried by said pavvls and projecting through the respective slots, said pins having a diameter less than the Width of said slots, springs acting on the respective pavvls tomove the same intoengagement with said ratchet Wheel, a leve-r mounted in said socket for rotatory movement, and a part carried by said lever to move either of said paWls into an inoperative position.

16. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet wheel operatively connected with said lifting element, of a lever socket mounted for rotation about said ratchet Wheel in a substantially horizontal y plane, guideways carried by said socket,

pavvls slidably mounted in the respective guidevvays and adapted to coperate with said ratchet Wheelto move the same in opposite directions, a lever mounted for rotatory movement in said lever socket, and means actuated by said lever-to render a selected one of said pawls inoperative.

17. In a lifting jack, the combination With a base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a lever socket mountedfor rotation about said ratchet Wheel, a paWl carried by said lever means for removably locking said lever in said socket.

18. In a lifting jack, the combination with a base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a lever socket mounted for rotation about the axis of the ratchet Wheel, a pair of paWls carried by said socket to coperate With said ratchet Wheel, springs tending to move said paWls into engagement with said ratchet Wheel, a lever adapted to enter said socket, said socket having an internal groove and a slot leading to said groove, a pin carried by said lever and adapted to enter said groove when said lever is placed in position 1n said socket, and a part actuated by the rotation of said lever to control the positions of said pavvls.

19. In a lifting jack, the combination With a base, a lifting element movably mounted on said base, and a ratchet Wheel operatively connected with said lifting element, of a lever socket mounted for rotation about the axis of said ratchet Wheel, springs to move said pavvls into engagement with said ratchet Wheel, a lever mounted in said socket for rotatory movement relatively thereto, and a part carried by said lever and actuated by the rotatory movement thereof to move one of said pavvls into an inoperative posi; tion, said socket and said lever having cooperating parts to limit the rotation of said lever.

In testimony whereof, We aflix our signatures hereto.

CHARLES W. RIPSCH. JAMES C. DAWLEY. CHAS. D. DERBY.