US1365656A - Jack - Google Patents

Description

H. H. BURNS.

1AcK.

APPLICATION FILED MAY 3, I9I9.

Patented Jan. 18, 1921.

UNITED STATES PATENT OFFICE.

HENRY H. BURNS, 0F BATTLE CREEK, MICHIGAN.

JACK.

Application led May 3,

To all whom t may concern:

Bc it known that I, HENRY H. BURNS, a citizen of the United States, residing at Battle Creek, county of Calhoun, State of Michigan, have invented a certain new and useful Improvement in Jacks, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use ythe same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to jacks for raising vehicles and a special object of my improvements is to provide a jack for raising the wheel of an automobile from the ground that shall be easily andl quickly, operated, that shall hold the vehicle firmly in its different positions, that is adapted to vehicles having axles of different road clearances, that may be readily and cheaply made and that shall be little liable to deterioration in use.

I secure this object in the apparatus illustrated in lthe accompanying drawings in which; l

Figure l is an elevation of a jack embodying my invention partly in section.

Fig. 2 is anelevation looking from the right of Fig. 1, the operating lever being omitted.

Fig. Bis a perspective view ofthe holding pawl.

Fig. 4 is a plan of the extensible lever used for operating the jack.

Fig. 5 is an elevation partly in section on the line V-V Fig. 6, similar to Fig. 1, but showing the parts in the different positions,

Fig. 6 is a section on the line VI--VI Fig. 5 to an enlarged scale.

Fig. 7 is a detail section on the line VII- VII Fig. 8.

Fig. 8 is a plan view of the parts shown in F1g.V 7.

Fig. 9 is a detail elevation of one of the actuating pawls.

Fig. 10 is a section on the line X-X Fig. 5 to an enlarged scale.

Fig. 11 is a section on the line XI--XI Fig. 8.

a is a cast pedestal having the plane bearing surface a2 and a flange or rldge as together forming/the base of the apparatus.- I is a. standard of U-shapc in cross section, as shown distinctly in Fig. 6 having the two Specification of Letters Patent.

.sleeved upon the cross bar, or rod, c2.

Patented Jan. 18, 1921.

1919. seriai No. 294,412.

side portions b2 b2 and the rear web b3 joining-t 1e adjacent edges of said side portions. The standard Z) is firmly secured above the flat bearing portion a2 by riveting its lower end to the flange (L3 thus the lower end of the standard Z) rests upon the bearing surface a2 and is rigidly secured in its position by rivets extending horizontally through the flange a There is a plunger e having the side portions @2 c2 and the rear portion e3. This latter bears against the portion b3 of the standard b and is adapted to slide thereon while the side portions e2 bear against the sideportions b2 of the standard. There is a ratchet tooth bar f, having the perpendicular faces of its teeth downward and the sloping faces upward, rigidly secured to the portion c3 of the plunger e.

c c2 c3 04 c5 are bars bolted or riveted into the side portions b2 of the standard b near their free edges and extending transversely across said standard. (I is a similar bar extending transversely across the bearing surface a2 of the base a and secured a short distance above and parallel to said surface.

g g g (Fig. 10) are three friction rollers L L are two lifting pawls having double teeth h2 at their upper ends adapted to engage the teeth of the ratchet bar is a pawl having two branches at right angles to each other, as shown most distinctly in Fig. 3. One branch extending vertically and expanded laterally at its upper end where it terminates in double teeth jg. The vertical branch, or arm, terminates in an extended bearing surface j at its lower end which engages against the bearing surface a2 of the base a.

The other branch j* of the pawl extends horizontally and is pivoted by the bar (I passing through an aperture i5 at its center. There is an inverted cup js formed at the outer end of the branch j* in which engages a pressure spiral Spring j? which acts to turn the pawl 7' about the bar d to force the teeth jg into engagen'xent with the teeth of the ratchetbar f.

ji is a lug extending outward from the upper end of the vertical branch of the pawl and having a cross bar or rod fixed in its outer end.

7c are pivoted lever arms having handles at their outer ends and provided with elongated slots at their centers through which lCO slots passes the rod or bar c2 to pivotally' secure said levers in place; The levers 7c le are interposed between the end and the center rollers g g g and extend inward between the lifting pawls L and holdin pawl j as distinctly shown in Fig. l0. he inner ends of the levers 7c la are pivotally secured by pins 7a2 7:2 to the lifting pawls 7L L.

m is a cast iron block, its lower port-ion fitting between the side pieces e2 c2 of the channel iron bar e and resting against the surface and upper edge of the rear portion e3 of said bar. The casting m is provided witha groove m8 (Fig. 8) centrally thereof and extending partly through the same so as to form the two side cheeks m* 'm4 with the cross bar m5. The upper surface of the casting mi is made concave,in arcuate form in cross section of the casting, as shown at m7. m6 represents a pair of vertically extending slots through the cheeks m* m* toward the edge thereof remote from the cross piece m5 and adjacent to the open end of the slot m8 and above the rear portion c3 of the reciprocating channel bar or plunger e. m9 is a transverse slot formed in the casting m in the lower wall of the `slot m adjacent to the open end of said slot. m is a transverse slot or indentation in the lower wall of the casting m adapted to tit over the upper end of the ratchet bar f to foi-1n an additional holding means for said bar.

.fn is a rod pivoted at one endand one side by pintles nt extending into the slots m". Therod n is located and adapted to turn in the slot m8 in the casting m. rl`he free end of the rod n is shaped similar to the surface m7, to adapt it for a holding` nleans. n3 vis a lug extending laterally from the rod n and having one of its surfaces shaped for receiving an axle of the vehicle. l`he rod n is turned downward to the position shown `in dotted lines in Fig. 1 in which case the axle may be engaged by the surface n3 at one level or if an axle is at a somewhat higher level it may be engaged by the surface m7 of the block m. or if there is an axle at a still higher level the rod n niay be turned to the vertical position as shown in full lines in Figs. l and 5 so that said axle may be engaged by the surface at. lvl/'hen the rod n is turned to the position shown in dotted line-s in Fig.` l and shown in part in full lilies in Fig. 7, it rests upon the upper edge of the portion e of the reciprocating plunger and it is provided with a lug a5, which engagesiin the transverse slot m in the casting m. l` his fornis a strong and firm support for the rod in this position and brings no strain upon the pintlcs n because of the elongated slots nl, the walls of which do not engagel the pintles in this position. `When turned to its vertical position the rod n bears with an extended surface n upon a corresponding surface of the plug m as shown quite clearly in F ig. 11. ln this position a shoulder n" upon the rod n engages the cross piece mi' of the casting m and this shoulder is extended laterally as indicated at nf Fig. 8, so that it shall bear nearly throughout the entire breadth of the block or casting 1n.

p is the actuating lever. This is pivoted with two plates p2 secured at one end to form forks having engaging notches at their outer ends. rll`he handle of the lever j) is formed with an extensible portion p" which is inverted lJ-shape in cross section and engages over the handle of the lever p so as to slide thereon. lt is held from disengagement by a metal band if. p is` a notch formed in the forks p2 of the lever [n at their lower edges adapted to engage over the cross bar or rod a.

a? is a U-shape strip of metal pivoted upon the cross bar or bolt c3 and having its branches extending between the lifting pawls /i z and the holding pawl j. This free to turn about its pivot c3 and hold the pawlsl in their relative lateral position and obviales friction between the pawls.

The operation of the above described apparatus is as follows:

rl`he actuating lever p is placed in the position shown in Fig. i, the notch p eni gaging over the bolt d and the end of the branches n2 engaging under the lower ends il* of the lifting pawls /e /i. branch pl comes upon each side of the holding pawl j. The outer arnl of the lever p is then dcpressed forcing the pawils ,l /1 upward until their lower ends /if engage the cross` har or rod c and a spur 71,3 engages under the cross bar c2 or a friction sleeve upon said cross bar. rlhe' raising` of the pawls /1 /i forces the ratchet bar j upward rarrving the plunger c up and raising the axle which nia \v be engaged by said plunger. lllhen the outer end of the lever In raised he pawls f1. L drop back to their orieiuai position in' gravity. the teeth /l2 engagi leeth nl the ratchet bar at a lower level and .hen ihc operation ma).Y be repeated until the plunger c is forced upward as far as desired. Ffhen the lifting pawls are in their lower.l position the spurs le engage against. the cross bar c with. their inclined lower sui-famme car rying the outer ends in `aid hars un of engagement with the teeth of the ratchet bar as shown in Fig. l. "lllhcn it is desired to lower the axle restingA upon the plunger c the outer end of th:` lever p is placed against a cross har et and a hole In throiurh said outer end near one of its edges engages over a pintle j in the lug dit extending laterally from the upper end of the holding` pawl as indicated in dotted lines in Fin; ."i. By depressing the outer r'id of the lever [he upper end of the pawl ,i is drawn outward disengaging its teeth from `those of the fl (l lofi lll)

llo

c bearing upon an exterior surface of said A ratchet bar and allowing the plunger yto fall. If the lifting `pawls h are in theirlower position as shown in Fig. 1 the plunger will fall promptly to its lowest position. If it is desired to lower the plunger slowly the levers lc are manipulated to engage the teeth h2 of said'lifting bars before the teeth j2 of the holding bar are withdrawn from en agement with the ratchet teeth and thus t e plunger will be allowed to descend by repeating said operation in a ste by step motion. c he operating lever handle may be extended to reach a convenient operating posi tion or secure a greater leverage and when folded together aifords a convenient handle to be grasped by the operator.

What I claim is: 1. In an apparatus o the kind described, a base, a plunger guided with respect to said base to reciprocate vertically and lrovided with ratchet teeth, a'holding paw` `having its lower end contiguous to said base extending upward and having a tooth toward its upper end engaging said ratchet teeth, the surface of the lowe'r end of said pawl base.

2. The combination of claim 1 when the holding pawl has a plurality of teeth toward its upper end engaging the ratchet teeth.

3. In an apparatus of the kind described, a base, a plunger guided to reciprocate vertically with reference to said base and provided with ratchet teeth, an actuating pawl having its upper end rovided with a tooth ada ted to engage said) ratchet teeth and exten ed downward to a point adjacent to said base, and an actuating lever adapted to removably bear on said base with 'an exterior surface and engage the lower end of said pawl.

4. In an apparatus of the kind described, the combination of a base, a fulcrum supported by said base, a reciprocating plunger guided to move vertically with reference to said base'and provided with ratchet teeth,

va holding pawl provided at its upper end with teeth engaging said ratchet teeth, said ratchet teeth extending laterally beyond the tooth of said pawl on each side, an actuating pawl on each side of said holding pawl having a tooth at its upper end adapted to en gage said ratchet teeth and extending downward to a point adjacent to said basefand an operating lever engaging said fulcrum at sald base and operatively engaging the lower ends of said actuating p'awls.

5. In an apparatus of the kind described, a base, a reciprocating plunger guided to reciprocate vertically with reference to said base and provided withratchet teeth of considerable extent, a holding pawl provided at its upper end with teeth for engagingsaid ratchet teeth, an actuating pawl upon each 'side of said holding pawl having a tooth at a base, a reciprocating plunger guided to reciprocate vertically with reference to said base and provided with ratchet teeth of considerable extent, a holding'pawl provided'at its upper end with a tooth for engaging said ratchet teeth, an actuating pawl upon each side of said holding pawl having a tooth at its upper end adapted to engage said ratchet teeth and extending downward to a point adjacent to said base, an operating lever adapted to engage a fulcrum supported at said base and to engage the lower ends of said actuating pawls, a lever pivoted upon a stationary support. and adapted to be manipulated at one, end to actuate said lifting pawls, and means for withdrawing the teeth of said holding pawl from engagement with said ratchet teeth.

7. In an apparatus of the kind described, a base, a plunger guided to reciprocate vertically with respect to said base, a rod pivoted to the upper end of said plunger to adapt it to be turned to the yside o? said plunger or to be turned to form an extension of said; plunger, and a laterally extending bearing surface on said rod, said rod being adapted to engage and support an axle on said laterally extending bearing surface when said rod is turned to the side of said plunger.

8. In an apparatus of the kind described, a reciprocating plunger, a rod pivoted to the end of said plunger so as to have lostA motion at the joint, a horizontal transverse slot inl said plunger and a lug on said rod adapted to engage with its outer` edge, thewall of said transverse slot and support said rod when the rod is turned to the side of said plunger for the purpose described.

9. In an apparatus of the kind described, a plunger having a horizontal slot in its upper end, a rodpivoted with lost motion in said slot. said rod being adapted to turn to a position forming an extensonof said plunger, the end of said rod being provided with an engaging surface corresponding to the lower wall of said slot and engaging the same in said position of said rod. i

10. lIn an apparatus of thekind described, a plunger having a slot in its end, a rod pivoted in said slot near the side of said plunger, said plunger being provided with a cross piece extending across said slot at the portion thereof remote from said pivot, said rod being provided with a shoulder yadapted to engage said cross piece, said rod being provided with an engaging surface adapted to engage the lower Wall of said slot when said rod is turned to the position 'forming an extension of said plunger.

11. ln an apparatus of the kind described, 4a base a plunger guided to reciprocate vertical-ly with respect to said base, a rod pivoted to the upper end of said plunger to adapt it to be turned to the side of said plunger or to be turned to form an extension of said plunger, a laterally extending bearing surface on said rod, said rodl being adapted to engage and support au axle on said laterally extending bearing surface when said rod is turned to the side of said plunger, a transverse slot in said plunger and a lug on said rod adapted to engage with its outer edge the Wall of said transverse slot and support said rod when the rod is turned to the side of said plunger for the purpose described.

l2. ln apparatus ot the kind described. a l'ilunger guided to reciprocate lol'igitudinally and provided with ratchet teeth along its side, a pawl extending parallel to said plunger and adjacent thereto having a tooth toward one end adapted to engage the teeth on said plunger. said pawl being pivoted at a distance from its engaging tooth and adapted to reciprocate a cam surface at a distance from said pivot and a lug adapted to be engaged by said cam surface to causo oscillation of said pawl about its pivot.

ln testimony whereof. l sign this specification.

HENRY H. BURNS.

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