US1941854A - Automobile jack - Google Patents

Description

Jan. 2, 1934. M. DWORK 1,941,854

AUTOMOBILE'JACK Filed June 4, 1931 2 Sheets-Sheet l INVENTOR WITNESS Max DurorK MM? #3 .2 BY j v mafia.

ATTORNEY Jan. 2, 1934- M. DWORK AUTOMOBILE JACK Filed June 4, 1931 2 Sheets-Sheet 2 5M v a R r w 51 .U 0 0 R a 4 7a; 3 m

m MD A A. l X 11 a Mm g :5 w j 4 my 8 5/ m m w N 4 A 7 6 a J; W fl 2 6 M, x 7 8 a A Q L IN yuan! H\ .|dl Win 5 II T f/ AWK k n 6 SIM I l 1 LiJ 5m N n H W YUM W m K 0 and21 of the standard 10.

through the front wall of the standard 10 and the web portion of said post.

' When the standard 17 is in the lowermost or depressed position the spring pressed bar. 24 will seat within a notch 36 in the edges of the flanges 23 whereby to lock the'post 17 against outward movement. A contractile spring 37 secured at one end of the lower end of the post 17 and at its other end. to the bar 24 automatically raises the post 17 out of the standard 10' when the bar 24 is released or is retracted from engagement with the notch 36.

The upper end'of the post 1'7 is bifurcated-and; has a shaft 38extending between the furcations' 39 thereof. The shaft 38 has a spool or roller 40 journalled thereon over which a flexible strap 41 is trained. The strap 41 carries'a pair of co operating grapplng hook's42'at' one end thereof and has the other end secured to-a rotatable shaft 43 whch is journalled in the side walls 20 The shaft 43'extends through the side wall 21 and has a toothed wheel '44 keyed thereon. A bell crank'lever 45 is journalled on the outer end of the shaft 43 adjacent the wheel 44 and has a pivoted spring pressed operating pawl '46 carried'by one arm 47 thereof for engagement in one direction of movement 'with the" wheel 44. The-other arm 48 of the bell crank engages within a socket in the end. of an operating handle'49 and is lockedtherein during rotation of the jack by means cf a thumb screw 50. It will be seen from an inspection of Fig.1 that movement of the outer end of the operating lever upand down will result in rotation of the wheel 44 and thus the shaft 43' causing the flexible strap-41 to be wound upon said" shaft. Reverse rotationof the wheel 44 and shaft 43 during upward movement of the lever 49 is prevented by means of a back-check pawl 51 formed with one end of an arm 52 which is pivoted intermediate of its ends to the side wall 21 below the wheel 4421s at 53. A'contractile spring 54 extends between'the opposite end 55 of the arm 52 and a point 56 on the standard 10 and servesto maintainthe-pawl 51 in engagement with the wheel445 The pawl 46 carries a pivoted latching lever 57,

the free end of which may be engaged in a notch58 in the hub of the bell crank 45 in an obstructing position to raise the pawl "46 out of engagement with the wheel 44. The pawl 51 may be disengaged from the wheel 44 through the medium of a'chain 59 extending between the end 55 "of the arm 52 and astrap 60 embracing the lever 49,*the end of the chain 59 being detach- }ably'secured'to' a ring 61 carried by the strap -60"through the mediumof a snaphook 62 By latching the pawl 46 oiit of engagement withthe wheel 44 and then raising the lever 49 to the positionshown in'Fig". 4, bothfpawlsf4fi and 51 will be-disengaged from the wheel 44jand the strap 41 will be permitted torotatefin a direction to-unwind the strap 41. r I u 7 t V In'the operation of the jack. the post '17 V is first raised to extended position andthehooks 42 are engaged with theend of the chassis 639f an tautomobileor other vehicle. With thepawl 46' engaged with the wheel'44 the lever 49 is operated to effect: rotation of the shaft 43 in a counter-clockwise direction to 'wind'the'strap 41 thereon and elevate thecar. pivoted door 64 may be provided in the rear. wall 32 of the standard '10 to accommodate the increased bulk as the strap 41 is wound up; When his desired the spring. Y

end of the chassis is raised by winding thel'strap by the appended claims.

to lower the car, the pawl 46 is locked out of engagement with the wheel 44, the chain 59 is hooked on to the ring 61 of the strap 60 and the thereby permitting the weight of the car suspended from the hooks 44 to unwind the strap 41 from the shaft 43. In order to prevent too sudden a lowering .of the car, a suitable friction brake 65 may be provided on the shaft 43 and the pawl 51 may also be allowed to intermittently engage the wheel 44601311217 a possible injury to the car due toa sudden fall will be obviated.

.In the modified form of the invention shown in Figs. 8 and 9 the post 17 carries a pair of forwardly extending horizontal arms 66, the inner ends of which are journalled on the shaft 38 on either side of the roller 40. A shaft 6'7 extendsbetween the outer ends of the arms 66 and has a roller 68 journalled thereon over which the strap 41 is trained afterits passage over the roller 40. The bifurcated brace arm 69 extends between the shaft 67 and the post17, the lower end of said brace being formed to hook over the upperl edge 70 of the web portion of said post between" the furcations 39. The purpose of the extending arms 66 is to adapt the 'jack for use with vehicles-having bumpers which project beyond therear end of the frame of the car. In order I bracket 72 is provided with a pair of spaced plates '73 and 74 between which the lower flange. 75' of the channel frame 63 is received. A set screw .76 passing through the plate '73 serves to lock the bracket to the frame. A pair of depending side, plates 77 and 78 formed'with the plates '73 and 74 have pins 79 extending betweeneach end thereof to which the ends of the strap'80 are secured as at 81. A suitable rubber buffer 82 is carried by the under side of the bracket 72.. for engagement with the upper side of the axle when the spring is abnormally compressed.

Injcase the strap cannot be'u'sed with certain types of cars, I have provided another type of sag limiting. means comprising an angle,

bracket having an upstanding .flange 83 for engagement against the web 84 of the chassis frame 63 and having a bolt .85 (Fig. 10) extending at right angles to thefiange 83 and projecting through openings in the'plates '77 and"'78 ofthe braoket'72 being securely fastened thereto by means of a nut 86 received on the threaded (Fig. '7). The ends of ,the cable are fastenedftogether to form a' loop which limits the sag' of It will thusfbe seen thatwhen lthe 41 onto the" shaft ra n will not be necessaryto f raise the chassis to an undue height before the wheel leaves the ground as will be the case if 'a sag limiting means .were not provided. a 7

Although a preferredembodiment of thefin vention has been shown and described, it: will be understood that variouschanges in the det'ails of construction may be made without departing from the spiritof the inventionas defined bar is movably carried by the standard, and resilient means for moving the mounting means toward the post to engage the bar either with the seat or the notch depending on the relation of the post with respect to the standard.

2. In a jack, a post having an opening, a stand- I ard with which the post has telescopic engagement, said standard having a slot, a bar having a portion occupying the slot, mounting means movably attached to the standard and carrying the bar for movement in the slot toward and away from the post, and resilient means acting on the mounting means and keeping the bar against the post and in said opening;

3. In a jack, a post having an opening, a standard with which the post has telescopic engagement, said standard having a slot, a bar having a portion occupying the slot, mounting means movably attached to the standard and carrying the bar for movement in the slot'toward and away from the post, resilient means acting on the mounting means and keeping the bar against the post and in said opening, a bail attached to said mounting means, and a lever connected with the bail and contacting the standard, the operation of the lever moving the mounting means co'ntrary to said resilient means thereby to move the bar away from the post;

4. In a jack, a post having a side notch, a

standard into which the post is telescoped until' the notch enters the confines of the standard, a bar and mounting means by which the bar is movably carried by the standard, said bar occupying the notch to hold the post in thetelescoped position, and a spring having its respective ends connected with the bar and with the bottom of the post, said spring being under tension while the post is telescoped thereby serving to raise the post out of the standard when the bar is disengaged from the notch.

5. In a jack, a rotatable winding shaft and a toothed wheel affixed to the shaft, an operating lever having a notch, an operating pawl carried by the lever to operate the toothed wheel, and

3 latch means carried by the operating pawl for holding said pawl in disengagement from the toothed wheel, said latch means comprising a lever to engage the notch.

6. In a jack having a rotatable winding shaft and a toothed wheel affixed to the shaft, an operating lever and a pawl carried thereby to operate the toothed wheel, a back check pawl riding the wheel to normally prevent retrograde rotation;

latch means carried by the operating pawl and.

being movable into an obstructing position against the lever for holding the operating pawl in disengagement from the toothed wheel, and means operated by the lever upon upward shifting thereof beyond its normal range of operating movement to displace the back check pawl and free the winding shaft, said means comprising a flexible element having its respective ends connected with the lever and with the back check pawl being drawn taut in the abnormal upward movement of the lever.

'7. In a jack, a lever having an arm and a notch, a pawl and means by which it is pivotally mounted on the substantial extremity of the arm, resilient means pressing on the pawl andtenoling to keep it in engagement with a ratchet wheel intended to be turned, and a latching lever pivotally carried by the pawl, being engageable with the notch to hold the pawl in an inoperative position against the tension of said resilient means.

8. In a jack, a hollow standard having an opening in one of its sidewalls, a winding shaft mounted'in the standard adjacent to said opennig, a flexible element connected with the shaft to be wound thereon, and a door'p'ivoted to the stand ard for thenormal closure of said opening, said door swinging to an open position to accommodate. the increasing bulk when said flexible element is wound on the shaft.

9. A jack having an extensible post with a seat, a standard with respect to which the post is extensible, a bar to enter the seat, and hold the post extended, and mounting means by which the bar is movably carried by the standard; means to retract the bar. and release the post said means comprising a member carried by the bar, and a lever carried by said member, having one end bearing against the standard.

MAX DWORK. V

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