US1859054A - Jack - Google Patents

Description

May 17, 1932. w. B. RUNYAN JACK Filed June 4, 1928 -VENTOR A TTORNEY Patented May 17, 1932 Uhtii" STATES PATENT FFICE WILLIAM B. RUNYAN, F DAYTON, OHIO, ASSIGNOR TO THE DAYTON MALLEABLE IRON COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO JACK Application filed June 4,

This invention relates to lifting jacks and particularly to acks of the multiple lift type. One object of the invention is to provide a lifting ack of the multiple lift type having a plurality of threaded lifting members, the jack being simple and cheap in construction and arranged so that the lifting members may readily be raised or lowered through the remote operation of its operating mechanism.

vAnother object of the invention isthe provision of a lifting jack having a rotatable driving member for operating a lifting member, this rotatable member having provisions for retaining it on the standard and for con- 3,5 veniently operating it directly by hand.

Other objects and advantages of the invention will be apparent from the following description and from the accompanying drawings in which Fig. 1 is a vertical sectional view through a jack constructed in accordance with the present invention; c

2 is a central vertical section on the line 2-2 of Fig.1;

Fig. 3 is a horizontal section on the line of Fig.1;and Fig. 4 is an end view of the driving member. As illustrating a' preferred embodiment of the invention double screw jack particularly 1J0 adapted for use in connection with vehicles equipped with balloon tires is herein set forth. Referringto the drawings the jack comprises a hollow standard having a base 11. Loosely mounted within the standard is a hollow or sleeve-like outer lifting member 12 provided with a cylindrical bore or passage 13. This member, 12 is externally threaded as indicated at 14 and is received within a. rotatable collar 15 which isinternally threaded as indicated at 16 to engage with the threaos 14 of the on er screw member.

1928. Serial No. 282,722.

yoke 20, having an opening 21 therein through which the outer screw member 12 readily moves, the yoke being-provided with a down turned flange 22 adjacent the opening 21 for cooperating withthejupper end of the collar 15 to restrain upward movement thereof and maintain the collar in operative position on the standard. Thelyoke is also provided with a guide opening or passage 25 within which is mounted the rotatable driving or socket member 26. This socket member carries a bevel pinion upon the inner end thereof, which meshes with a bevel gear 31 carried by the collar 15, the arrangement being such that rotation of the driving or socket member 26 will cause rotation of the collar 15 in one direction or the other.-

The socket member 26 is provided with a non-circular opening 32 adapted to receive a correspondingly shaped end of a suitable operating handle 33' so that that rotatable driving or socket member 26 can be rotated remotely or from a convenient distance. The operating handle 33 is adapted to be easily inserted and removed from the socket 32 and i This wire the adjacent surface of the sleeve portion of the standard and engages. a shallow groove provided near the end of thesocket memb r, attheends $61 and at the depressed portions 62 of the wire device between adjacent lobes. The ends --61 are cut off sharply as shown and are arranged to meet the shallow groove portion of the socket member at a suitable angle so that these ends have 'a tendency to diginto the metal of the socket memher and prevent relative turning of these parts in either direction. The wire device 34 is sprung on the endof the socket member and when in place it abuts the end of the adjacent portion of the standard and thus serves 5 manual movement of the socket member and the consequent movement of the lifting member of the jack without employin the remotely operated handle 33. The Tobe portions of the wire device, projecting as they do beyond the adjacent cylindrical standard portion can readily be operated by the thumb and fingers of the hand of the operator to approximately adjust the position of the liftmg members so that the jack is ready to engage a load, or so that the lifting members may be lowered into their lower retracted positions.

Adjacent the upper end of the bore 13 the inner wall of the main or outer screw member 12 is provided with internal screw threads as shown at 35, which are adapted to engage the external threads of an inner screwmember 36 which is thus received by the outer screw member. Upon relative rotation of the outer and inner screw members the latter willbe moved axially either up or down relative to the former. The inner screw member is provided at its upper end with a saddle or cap 37 which is adapted to receive the load, such as the axle of an automobile, this cap being preferably rigidly secured to the member 36 by means of a fastening pin or by any other suitable means.

The construction, as thus far described, is such that upon rotation of the collar 15 relative to the outer screw member 12, the latter is caused to move up or down within the standard. Likewise rotation of the outer screw member 12 relative to the inner screw member36 will cause the latter to be moved either up or down within the outer screw member. Consequently, should the socket member 26 and the collar 15 be rotated while the cap 37 is in engagement with the load, there will be either a rotation of the collar with respect to the outer screw member to cause axial movement of the latter, or the outer screw member may rotate with the collar to cause axial movement of the inner screw member. However the jack must 0rdinarily be operated somewhat before the cap is brought into contact with the load, and the present invention contemplates the provision of means for-yieldingly resisting rotation of the outer screw member relative to the standard so that axial movement of the outer screw member 12 within the collar may result during the initial operation of the jack.

A slide member 40 is provided having one or more lugs 41, 42 which are guided vertically and are freely slidable in the standard in slot-s or guides 43 which extend along the inner wall of the standard to points 44 adjacent the cylindrical guide surface 45 near the ball bearing and thus prevent rotation of this member 40 during operation of the jack. The slide is provided with a cylindrical portion 46 which is freely received in the lower end of the outer screw member 12. A transversely extending hole 47 in the slide member 40 receives a pair of steel balls 48 between which is a spring 49 which presses the balls outwardly. The size of the hole 47 is justslightly larger than the diameter of the balls 48 so that the latter may be moved in a radial direction within the hole. The balls are adapted to normally project somewhat beyond the outer cylindrical surface 46 of the slide member 40 and into a shallow groove 50 extending circumferentially around the inner cylindrical bore near the lower end of the outer screw member 12. At one point along the shallow groove 50 is a socket or pocket 52, preferably only a little less in ex tent than the diameter of the balls, which may be caused by drilling a hole 58 through the wall of the outer screw member as shown in Fig. 2, which pocket 52 acts as a non-positive or yielding lock for resistingrotational movement of the balls within the groove 50. Vhen one of the balls is thus engaged within this pocket the pressure of the spring is effective to hold the ball within the enlargement to thus interpose a yielding resistance to rotation of the outer screw member with respect to the standard. As the ball is only partially received in the pocket 52, as shown in Fig. 2, the pressure of the spring may be overcome and the ball may be forced out of the enlargement to permit rotation of the outer screw member in the standard. The balls, the shallow groove 50, and the pocket 52 thus serve to hold the member 40 within the lower end of the bore of the outer screw, and also yieldingly resist rotation of the outer screw. When the collar 15 is rotated the outer screw tends to rotate with it: but the resistance of the member 40, due to the yielding locking of the balls in the pocket 52, tends to overcome this rotative effect and the outer screw is therefore held against rotation, so that it will travel axially, until this yielding locking effect is overcome,as will occur when the upward travel of the member 40 brings the lugs to the upper ends of the grooves 43. By increasing or decreasing the strength of the spring 49, the relative depth of engagement of the balls in the pocket 52, the abruptness of the walls of the pocket 52, etc., the degree of yielding resistance may be varied.

The assembly of the various parts of the jack is accomplished in a very simple man ner merely by inserting the spring and then the balls in the hole 47 of the slide member 40 and th n pressing the slide member in the end of the outer screw member until the balls spring out and engage the shallow groove 50, and it will also be apparent that the parts are very simple in their construction andare easily and cheaply made.

The operation of the jack will now be apparent. Upon rotation of the socket 26, the collar 15 is rotated, and if the load is not engaged by the cap 37, the outer screw member 12 will be moved ax ally without rotation, the yielding restraint of one of the balls 48 in the enlargement 52 at the lower end of the outer screw member being effective to yieldingly restrain rotation of the outer screw member at this time. During the elevation of the outer screw member, before engagement with the load, the inner screw 36 moves with the outer screw member and remains in its lowermost or normal position within the outer screw. When the load is engaged by the cap 37 rotation of the inner screw member is prevented. Upon continuing the rotation of the collar 15 the outer screw member 12 may be either rotated or moved ax ally dependent upon the strength of the spring-4L9 and the two screw members are thus raised until the pin 55 which is provided in one of the thread grooves. of the outer screw member engages the lower face of the collar 15. Further axial movement of the outer screw member without rotation is thus prevented, and the outer screw member is then rotated with the collar 15 to screw the inner screw member 36 out of the outer screw member. It will be apparent that the inner screw member 36 will be moved axially by rotation of the outer screw member 12 as the fcrmeris prevented from turning by the engagement of the cap 37 with the load. A pin 56 provided in a thread groove of the inner screw member near its bottom end is provided to engage the lower end of the internal threads to prevent the inner screw memberfrom being screwed entirely out of the outer screw member.

To effect the lowering of the load, and the withdrawal of the screw membe's into the standard, the collar 15 is rotated in a reverse direction. The outer screw member will thus be moved axially in a downward direction until the lower end of the outer screw member is adjacent the base ofv the standard, at which time a pin 58 engages the top of the collar 15 to prevent any further axial movement. During this lowerng of the outer screw member its rotation yieldingly prevented in the standard by the effective operation of the balls "one of which remains seated in the pocket 52. The yielding engagement of the balls with the outer screw member is overcome after the outer screw member has been lowered and when the pin 58 engages the top of the collar 15 so that the outer screw member is caused to rotate with the collar to withdraw the inner screw member. After the load is disengaged the inner screw member may read ily be rotated so that it is screwed into the outer screw member to its extreme lower position in case the disengagement ofthe load occurs before the inner screw member is entirely withdrawninto the jack.

While the form of apparatus herein dcscribed constitutes a preferred embodiment of the invention it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is: r I

1. A lifting jack comprising ahollow standard, an externally threaded outer screw member mounted in the standard, an inner screw member threaded in the outer-screw member, means for elevating the screw members comprising an internally threaded r0- tatable collar engaging the threads of the outer screw member, and means yieldingly carried by the outer screw member for relative rotational movement with respect thereto and comprising a. member slidably guided in the standard for causing axial movement of the outer screw member on rotation of the collar. I

2. A lifting 'jack comprising a hollow standard, an externally threaded outer screw member mounted in the standard, an inner screw member threaded'in the outeri screw member, means for elevating the screw members comprising: an internally threaded r0- tatable collar engaging the threads of the outer screw member, means carried by'the outer screw for axial'movement therewith and fixed against rotation in the standard, and a spring-pressed device provided in said last named means for yieldingly engaging the lower end of the outer screw member for causing it to be moved axially by rotational movements of the collar.

I 3. A lifting jack comprising a hollow standard, an externally threaded outer screw member mounted in the standard, an inner screw member threaded in the outer screw member, means for elevating the screw members comprisingan internally threaded rotatable collar engaging the threads of the outer screw member, and means for causing axial movement of the outer screw member comprising a slide telescopically received in the lower end of the outer screw member, a guide in the standard for said slide, a lug on said slide received in said guide, anda spring-pressed ball held in said slide, said outer screw member having a shallow groove receiving said ball to cause the slide to be moved axially with the outer screw member, said groove having an enlarged portion partially receiving the ball to yieldingly restrain relative rotation of the outer screw member and the slide.

4. A lifting jack comprising a hollow standard, an externally threaded outer screw member mounted in the standard, an inner screw member threaded in the outer screw member, means for elevating the screw members comprising an internally threaded rotatable collar engaging the threads of the outer screw member, and means yieldingly carried by the lower end of the outer screw member and movable axially therewith and comprising a member'positively restrained against rotational movements by the standard for causing axial movement of the outer screw member on rotation of the collar.

5. A lifting jack comprising a hollow standard, an externally threaded outer screw member mounted in the standard, an inner screw member threaded in the outer screw member, means for elevating the screw members comprising an internally threaded rotatable collar engaging the threads of the outer screw member, means movable axially at all times with the outer screw member and fixed against rotation in the standard, and a spring pressed device provided in said last named means for yieldingly engaging the lower end of the outer screw member for causing it to be moved axially by rotational movements of the collar.

6. A lifting jack comprising a standard, a rotatable interiorly threaded driving member mounted in the standard, an exteriorly threaded screw sleeve meshing within the driving member, the sleeve being also interiorly threaded, a second screw meshing with the internal threads of the sleeve and cooperating means comprising a guide-way on the standard and a friction clutch carried by the screw sleeve for normally resisting rotary movement of the sleeve, but yielding to permit the sleeve to turn with the driving means when at the limits of its vertical movement, said clutch frictionally engaging the screw sleeve and having a projection thereon extending into said guide-wayand making therein a non-rotatable longitudinally slidable connection with the standard.

7. In an extension device,a frame, an extensible member arranged in said frame, an operating member carried in said frame in position .to threadingly engage a portion of said extensible member, means for rotating said operating member relatively in said frame to move said extensible'member axially therein and means having a splined connection with the frame and frictional engagement with the extensible member and carried by said extensible member and coop- 8. In an extension device, a frame, a threaded extensible member arranged in said frame, an operating member carried in said frame in position to threadingly engage said extensible member, means for rotating said operating member relatively in said frame to move said extensible member, and friction means arranged between said frame and said extensible member for preventing relative rotation therebetween, said means comprising a member having keyed connection with the frame and frictional engagement with the extensible member.

9. In an extension device, a frame, an extensible member arranged in said frame for projection and retraction with respect to the frame, an operating member carried in said frame and having threaded engagement with said extensible member, means for actuating said operating member to move said extensible member axially in the frame, and friction means arranged between said frame and said extensible member for preventing relative rotation therebetween, said means ineluding a member keyed to the frame and having frictional engagement with the extensible member, said frictional engagement being sufficiently great to overcome the rotational urge imparted to said extensible member by the operating member through the threaded connection between the operating member and the extensible member when the operating member is actuated.

10. In an extension device, a frame, an extensible member arranged in said frame for projection and retraction with respect to the frame, anoperating member carried in said frame and having threaded engagement with said extensible member, means for actuating said operating member to move said extensible memberiaxially in the frame, and friction means arranged between said frame and said extensible member for preventing relative rotation therebetween, said means including a member having positive keyed connection with the frame and frictional engagement with the extensible member, said friction member being carried at the lower end of the extensible member.

11. In an extension device, a supporting frame, an extensible member arranged in said frame, an operating member rotatably mounted in said frame and having operating threaded engagement with said extensible member and means frictionally engaging and carried by said extensible member and having splined engagement with said frame to retard the relative rotation of the extensible member with respect to the frame.

12. In an extension device, a frame member, a lifting member arranged in said frame, an operating member rotatably mounted in said frame and having threaded connection with said extensible member whereby the extensible member may be axially moved with said extensible member is normally held respect to said frame upon rotation of said against rotation.

In testimony whereof I hereto affix my sigoperating member, means for rotating said operating member, and a device extending between said extensible and frame members, said device having frictional engagement with one and splined engagement with the other whereby to normally prevent relative rotation of said extensible member with respect to the frame.

13. In an automobile ask, a frame providing a standard having a vertical channel therein, a lifting member arranged in said frame and telescoping in said channel, an operating member comprising an internally threaded nut supported in the frame at the upper end of the channel, said lifting member threading through said operating member and a second lifting member having a load carrying head at its upper end threading into said first lifting member, cooperating stops limiting the projection of the first member through the operating nut and the second member through the first mentioned member and a member carried by the first mentioned member and having frictional engagement therewith and having a portion providing splined connection with the frame.

1 1. An automobile jack, a frame providing a standard having a vertical channel therein, a lifting member arranged in said frame and telescoping in said channel, an operating member comprising an internally threaded nut supported in the frame at the upper end of the channel, said lifting member threading through said operating member and a second lifting member having a load carrying head at its upper end threading into said first lifting member, cooperating stops limiting the projection of the first member through the operating nut and the second member through the first mentioned member, means for rotating said operating member and a friction device carried by the first lifting member and engaging the frame to normally prevent rotation of said extensible member with respect to the frame but yielding to permit rotation of said extensible member, said frictional device having means forming a splined engagement with the frame and frictional engagement with the lifting member.

15. In an extension device, a frame, an extensible lifting member arranged in the frame in position to be retracted and projected axially therefrom, an operating member rotatably mounted in the frame and having threaded connection with said extensible member for imparting axial movements thereto, said extensible member being formed to provide a shoulder adjacent its lower end, and a spring pressed clutch member operatively associated with said shoulder and hav ing keyed connection with the frame whereby nature.

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