US1701314A - Jack - Google Patents

Description

Feb. 5, 1929.

L. G. sHOoK JACK 2 Sheets-Sheet 1 Filed 0G17.l l. 1927 faken-01' Zu/fence G SOQ Feb. 5, 1929.A 1,701,314

' L. G. SHOCK JACK Filed oct. 1, 1927 sheets-'sheet 2 Patented 1929,.- UNITED STATES.

'PATENTJoFI-TICE.

- 1,1oi,311 4f LAWRENCE G. SHOCK',l OF LOS ANGELES, CALIFORNIA..

JACK.

' Apuoaaon nie october 1, 1927. serial im. 223,334.

ing or rotating the screw,y the rotation of v at the Sametime swingingy the ends connect-- l ed to the base and to the head upwardly and lifted;

the screw actuating two pairs of arms somewhat on the toggle princ-iple so that when an axle of the car is engage it may be readily A particular object o'f my invention is the arrangement forinterconnecting the toggle` arms to the screw so that as the arms are drawn inwardly or outwardly along the screw they also act to swing in an upward on downward direction.

Another feature of my invention is the interconnecting of the togglefarms with the screw to cause the ends connected to the screw to be drawn to and over each other and also downwardly, as well as hav/fing the ends connected to the base and the/headinterconnect-V ed by Vteeth segments. I prefer to perform the interconnection between the ends of the toggle arms by means of geared segments or the equivalent.

Infon'e construction I utilize a pai of nuts on each end of the operating'screw, these nuts being held from rotation and havin rack teeth on opposite edges. These rac teeth engage teeth on the segments of the toggle arms at their outer ends thus causing theV arms tov swing as the nuts are drawn towards the center ofthe screw or forced outwardly. In ,another construction the segments on the outer,` ends of the toggle arms areiformed with a' worml type of gear which engages directly with the thread on the screw, such segments, therefore, j functioning as a nut, causing the outer ends of the toggle arms'to travel in the direction in which the screws are operating and also the worm andl gear connection regulates the angular turning of the toggle arms.

It is well known that inthe toggle. ty e 'of operated lifting jacks when t ejac s are in? their lowered position in which the arms are at a small angle to the screw it re uires a' large amount of power to lift. the

weight being elevated and it is ver often dilfi'cult to start such jacks in lifting the weight. When, however, the toggle. arms 'of drawings, in, which:

approach each other' in a vertical direction and are at a small angle to the vertical it is 5 Acomparatively easy to actuate thejacks. A

characteristic of my jack is the feature lof a. torque or angular turn being'imparted to the 'toggle arms throughout their whole movement, this vbeing especially 'effective when the jack i's in its lowered position to raise a weight. The positive turning force given to the arms Cfacilitates the opening of' the jack and is an especially valuable feature paratively small.

understood from the following description Figure l is a plan view of one typeof jack,

Fig. 2 is a side elevation't'akenin the direction of the, arrow 2 of Figure 1, partly broken away Fig. 3 is a detailed-vertical section through the base on the line 3%.-3 of Figure 2,

Fig. 4 is a detailed vertical section on the line 1 -4 of Figure arrows,

Fig. 5 is a horizontal view ofl a modified form of jack,

Fig. 6 is a slde elevation taken inthe direc-r tion of the arrow 6 of Figure 5 partly broken away, and

Fig. 7 is a'vertical section taken upon the line 7-7 upon Fig. 6. t u The form of jack illustrated in Figures 1 to 4 is substantially as follows:

The base 1 has a pair of upstanding t flanges 2 with a. pair yof pivot pins 3 extending therethrough. Each of the toggle arms are pivoted to one of` the pivot pins and both have' geared segments 4 'intermeshing Theinner ends of the toggle arms, that is, the ends' connected to the base andthe head are'actuated simultaneously due to the intermeshing teeth 4. Each of the toggle arms is made substantially similar and has sidebars 5, on the pivots 3 being spaced by sleeve 6. i At the outer ends blocks 7 are secured to the bars 5 by rivets 8 or the like. The head 9 is preferably channel shaped having the pivot pins 10 extending through theiianges 11 with the'sleeve 6 separating the ends somewhat as in regard to the base.

. The upper toggle arms are designated generally by` the numeral 12 and the lower toggle arms generally by the numeral 13. The

blocks 7 of each of these arms have a toothed 2 in the direction ofthe l where the clearance between the `ground and the bottom of the article to be lifted is com.

segment 14 and at the axial vcenter of the segment arev pivot pins 15 between which the strap links 16 are connected., These' strap links are on the opposite sides of the arms and se ments.

he operating screw 17 is reversely threaded and has nuts 18 threaded thereon, these y nuts being attened on the sides 19 next the `straps 16and have rack teeth 20 thereon 'are forced to part, that is, the head is separated from the base. The inward movement of the nuts also swings the arms, due to the engagement of the rack teeth on the nuts with the teeth on the se ments 14. rlhis action forces the inner en s ofthe upper arms upwardly and the inner ends oft-he lower arms downwardly relative to the screw.

In lowering the jack the operation is substantially the' reverse of that above set forth, it being necessary to rotate the screw as the weight of the vehicle cannot depressthe jack even when the arms are considerably fiattened out relative to the screw. It is to be noted in the construction above described that the straps 16 .are not connected to the nuts but .are pivotally connected to the toggle arms atl the axial center of the toothed segment in-mesh with the threads of the screw.

The., construction of the jack of Figures 5, 6 and 7, is substantially as follows in so far as it diifers from that of Figures 1, 3 and 4: thelower and upper toggle arms 25 and 26 are each formed of two side bars whichV e'xtend from the intermeshing teeth 4 to the curved segmental ends 27. These ends-are positione to` contact as indicated by the numeral 28, such ends being held by straps 16, having pivot bars 15, as inthe former construction. -Blocks 29' are secured' by rivets `30pv to the side bars of the lower and@ upper togglearms. These blocks have worm A gear teeth 31 to mesh with the threads ofthe screw 17.

fthe operation of the jackof Figures 5,

y v 6 and 7 assuming the `same is in a lowered.

position asshown` in Figure 6, on rotation ofthe screw in the .proper direction the inl termeshing of theA threads of the screw` and the worm threadsl of the segments cause the outer-ends of the'toggle arms to be drawn inwardly and jat the same time the head and base are pressed apart. Theinner ends of the armsl have osclllating or swin ing moon theinner ends of the arms cause these'to move simultaneously through the same are. lin the action of the lifting jack, when.V there is a heavy weight on the gael;` thepressure is transmitted between the rolling segments 27,

which, asy above described, have a co tact point at 28,y thus there is nov heavyl t rust placed on the screw 'or the worm geared teeth 31. In the reverse operation the weight of the vehicle cannot lower the jaclr on account of the worm and'gear operation and' even when the toggle arms are 1n a position with slight angularity to the screw, the heavy weight of the vehicle cannot force the head and base together but requires continuous operation of the crew to lower the jack.

It will be noted that a characteristic feaplied to the screw ll am enabled to lift heavier I weights when the jack is nearly in a collapsed posltion than with the yordinary type of screw thread and toggle arm type of ack.

Another feature to be note my invention is that the length of the lever arm provided by the segments on the ends of in regard to ture of my invention is the segmental gears l on the outer ends of the toggle arms, theseY the'toggle arms connected tothe nuts or di- 4 rectly tothe screw may be chan ed in relation-to the length of such arms etween the pivotal connection to the links and the pivotal connection to the head or base. Such changewill chan e the leverage with which the. toggle arms unction in relation to the head and the base in spreading the same apart.

Ify a certain definite lift for the jack is required and, the head and base being of substantiall constant size, if the segments are increased in radius,-the length of the toggle ar/ms from theaxial center of the segments to their pivotal connection to the' head and base' may be shortened.

It' will be understood that various chan es i ma be made in the details of the construction wit outdeparting from the spirit and scope of the invention as deinedfbythe appended claims.

' I clalm:

v 1. A jack comprising a combination, 'a plu-` ralty'y of togglel arms, the inner ends bein connected to a base and a head, a screwan a grooved segmententhe louter end of thev arms, and means forming-an operative geared ist connection between the segments andthe tion. I'In' vthis `case the, intermeshing teeth 2.,Ajack comprising-abombination,apl- )i0 rality 'of toggle arms', the inner being ends of the arms.

connected to a base and a head, a screw, a' plurality of nuts on the screw and a'gear'ed connection between the nuts and the outer 3. vA jack comprising a combination, a plurality of toggle arms, the -inner endsrbeing connected to abase and a head, a screw, a

,plurality of nuts on the screw, means rescrew, links pivotally connecting the outer ends of the upper and lowerpalr of toggle armsl and a. .geared connection between the outer ends of said arms and the nuts.

A jackas claimed in claim 4, links en-` gaging the nuts and preventing the rotation of same, said nuts having rack teeth and the outer ends of the toggle arms having segments l.

with teeth meshing with said racks.

6. A jack comprising in co'mbinatiom'a-n]I upper and lower pair of toggle arms, the in# ner ends of said arms being pivotally connected to a head and a base res ectively,in termeshing geared teeth on the mner ends of 5 said arms, a screw havingl reverse threads, a

pair of nuts having racks on their upper and ow'er edges, segments having :geared teeth on the outer ends o f. the arms, said geared teeth meshing with the racks, and links pivotally connected to the outer ends of the arms.

7. A jack comprising a base, a head, an upper air of arms having their inner ends pivotal y connected to the head` a lower pair of arms having their inner ends pivotally connected to the base, means pivotally connected to the outer ends of correspondingr arms of the pairs and-,connecting them to each other, the pivots at the outer ends of the arms constituting fulcrums, there being teeth formed on the 'outer ends of the arms, and means engageable upon the teeth for drawing the outer ends of the arms inwardly.

In testimony'whereof I have signed my name to this specification. 1.

. LAWRENCE G. s HooK.

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