US1176947A - Lever-jack. - Google Patents

Description

D. COSTARELLA LEVER JACK.

APPLICATION FILED JULY 28, I915- Patented Mar. 28, 1916.

ATTORNEYS.

ulz cow-BIA PLANOGRAPH c0., WASHINGTON, D.

flrnn STATES DOMENICO COSTARELLA, 0F MILWAUKEE, WISCONSIN.

LEVER-JACK.

Specification of Letters Patent.

Patented Mar. 28, 1916.

Application filed July 28, 1915. Serial No. 42,268.

To aZZ whom it may concern V Beit known that I, DOMENICO COSTARELLA, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Lever-Jacks, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to lever jacks.

The invention relates more'particularly to that type of jack in which the rack edge lifting bar is slidably mounted in the jack casing, a leveris pivotally mounted in the casing, a pair of pawls are pivotally carried by said lever and adapted to engage the rack edge of said bar, a spring pressed'movable pawl tripper is adapted tocoiiperate with the pawls and in which means are provided for controlling the action of the tripper.

, The invention is designed to provide a new and improved form of pawl tripper for a jack of the type described and means for controlling the action of said tripper.

The invention is further designed to provide a simple means cotiperating with the tripper for releasing the pawlsfrom engagement with the rack bar topermit the bar to bedropped to its lowest position.

-The invention is further designed to provide a new and improved form of lever jack.

The invention consistsin the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof; v

In the drawings, Figure l is a side View of the device embodying the invention, parts being removed to show theinterior portion of the device and parts being broken away,

shown in operative position to engage the pawls for downward movementof the lifting bar; Fig. 3 is a section taken on line 38 of Fig. 2; Fig. 4 is a section taken. on line 44 of Fig. 2; Fig. 5 is a detail side view of the device. V I

The device; comprisesacasingfi, a lifting bar 7 vertically slidably mounted in. said casing provided with the usual pair of upper and lower lifting portions8 and 9, respectively, and also with rack teeth 10 on its rear edge, an operating lever 11 fulcrumed in the frame 6 by a pin 12, a pair of pivoted pawls 13 and14 mounted on said operating lever and adapted to alternately engage the rack teeth to raise or lower the bar, a pawl tripper cooperating with saidpawls during the downward movement of the bar, means for controlling the operation of the pawl tripper, and means for .disengaging the pawls to permit the bar to be dropped to lowest position. The pawls l3 and 14 are pivotally connected to the operating lever 11 on opposite sides of the fulcrum sothat the up and down movement of the lever will change the relative distance apart of the engaging ends of the pawls, which pawls, when movedby the lever, will raise or lower the lifting bar. The pawl 13 is provided with a laterally extending pin 15 and a spring 16 secured at oneend to the casing engages the pin 15 to resiliently press the pawl 13 into engagement with the lift bar "7. The pawl 14 is provided with a lug 17 to which one end of a spring 18 is secured, the other end of said spring engaging with the Wall of the casing to resiliently press the pawl 14 into engagement with the teeth of the lift bar 7.

The construction thus far described permits the lifting bar to be raised step by step in the casing as the up and down movement of the lever 11 will cause the up and down movement of the pawls 13 and 14 so they V will alternately engage the teeth of the rack 7 the step by step downward movement of the lift bar. This pawl tripper comprises a one piece member 19 pivotally mounted upon a pin 20 on the casing and provided with arms 21'. and 22, which are spaced apart through aconnecting portion 23, and with an extension 24 adjacent the arm 22.

The side of the casing adjacent the pivoted end of the tripper is recessed, as shown at 25 in Fig. 1, and the extension 24 is loosely mounted within said recess. A spring 26, surrounding the extension 24 is interposed between the recessed portion 25 of the casing and'theportion of the tripperv adjacent its arm 22 whereby the tripper may be moved downwardly on its pivot pin 20 against the action of the spring 26. The arm 22 of the tripperis provided with a cam surface 27 28 for'engaging a laterally extending pin 29 on the pawl 14. a

The means for controlling the operation of i the pawl tripper comprises an extension 30 integral with the arm21 and projecting outwardly through a notched slot 31 in the casing adjacent the. compartment 32 therein which arm is adapted-to engage either side 33 or 34 of said notch to fix the position of the pawl tripper; A pin 30 isalso adapted to engage the tripper 19 to limit its upward movement.

The'means for disengaging the pawls to I permit the bar to be dropped to lowest position comprises the tripper pin 15 which is extended outwardly through a slot-35 in a plate 36 secured to the casing adjacent'the compartment 32 which plate is provided with an annularflanged portion'37 to prevent anything striking .the pin 15' When the lifting bar is in its highest position the leverll may be operated to throw the pawl 14 out of engagement with the rack edge of the bar and then-the operator, by grasping that portion offthe pin 15 which extends through the aperture 35 in the plate, maylift the pawl 13 out of engagement with the rackbar and thereby permit thebar to be dropped to its lowest position. V

V The operation of the pawl tripper is as follows:On the downward movement of the jack the extension 30 on the tripper is moved so as to engage the side 33 of the notch 31, as shown in Fig. 2, thereby disposing the tripper in such a position as to cause the pins 29 and15 on the pawls 13 and 14 to alternately engage the cam surface 28 and 27 of the tripper to alternately disengage the pawls from the rack edge of the bar during the operation of the lever f 11. Thus the downward movement of the outer end of the operating lever causes the pm 29 projecting from the pawl 14 to ride outwardly on the upper edge of the upper arm 21 and disengage said pawl from the rack bar while the lower pawl 13 is in its highest position, as shown'in Fig. 2. The arm 21 will hold the pawl 14 out of engagement with theteeth of the bar during the upward movement of the outer end of the lever while the pawl 13 is traveling downwardly with the rack until the next-tooth above the'one previously engaged is engaged by the pawl 14. When thus engaged,

. lower pawl 13 moving downwardly will then a be swung out of engagement with the cam surface of the lower arm 22 and'the pawl 14*will then engage and support the bar and as the hand lever is again lowered, the lift bar will be moved downwardly the distance of one tooth and by repeating the operation the bar will be lowered step by step.

During ..i l1e,,ClO11WilI'd .movement of the .outer end of the lever 11, the pin 29 engaging the tripper swings it downwardly against the action of the spring 26andthe 1 spring resisting cooperates with the cam surface 27 to move the pin 15 and consequently the pawl 13 out of engagement. with the lift bar. Thus the tripper, aided bythe spring 26, cooperates with the pins onthe pawlsgto move said pawls alternately out of engagement with the rack edge of the lifting bar to permit the descent of said bar during the up and down" movement of the lever. hen it is desired to move the lifting bar upwardly, as previously described, the operator moves the'extension 30 against the action of the spring 26 into engagement with the side 34 of the slot 31' thus disposing the tripper in the position shownin Fig.

1, in which position it does not act upon the'latera'lly extending pins of the pawls during the up and down movement of the:

lever. Thus it will be noted fthat withthe extension 30 forming a.handle'the"operator may easily adjust the position of the tripper to permitthe inward or outward movement offthe lifting'bar withrespect tothe casing to lower or raise said'bar.

The invention thus exemplifies lever j ack in which the spring pressed tripper for controlling the operation of .thepawls is swinginglymountedwithin the casing and is provided with an integral hand operated extension which cooperates with the notch in the casing for adjusting the position of" the tripper for raising or lowering the'liftingbar'."'

The invention is not to be restricted'to the details of construction herein set forth, but may be variedso as t'o'be within the of the appended claims.-

What I claim as my 1nvention-is':-

1..In a lever jack, the combination, with a casing,a lifting bar slidably mounted in the casing and provided with a rack edge,

scope an operating lever pivotally secured to the V casing, and a pair ofspring pressed pawls 'pivotally' secured to said lever and engaging a casing, a lifting bar slidably mounted in the casing and provided with a rack edge, an operating lever pivotally secured to the casing, a pair of spring pressed pawls pivotally secured to said lever and engaging the rack edge of said bar and provided with laterally extending tripping lugs, of a tripper pivotally mounted within the casing and having arms extending from one side thereof provided with tripping lug engaging surfaces, said casing having a recess and a slot therein, an extension on said tripper loosely mounted in said recess, a spring on said extension interposed between a portion of the casing adjacent the recess and said tripper, and means integral with said tripper and cooperating with the sides of the casing adjacent the slot therein for controlling the operation of said tripper. V

3. A lever jack comprising a casing having a compartment in one side thereof and a notched slot in the side of said compartment, a lifting bar slidably mounted in said casing and provided with a rack edge, an operating lever pivotally secured to the casing, a pair of spring pressed paWls pivotally secured to said lever and engaging the rack edge of said bar, laterally extending tripping pins connected to said pawls, a spring pressed tripper pivotally mounted in the casing for engagingsaid pawls and an extension on said tripper extending outwardly through the notched slot in the casing cooperating with said casing to control the operation of said tripper.

4. A lever jack comprising a casing having a compartment in one side thereof, said compartment having a notched slot in the top thereof and a recess in one side thereof, a lifting bar slidably mounted in the casing and provided with a rack edge, an opcrating lever pivotally secured to the casing below the notched slot, a pair of spring pressed pawls pivotally secured to said lever and engaging the rack edge of said bar and provided with laterally extending tripping lugs, a tripper pivotally mounted within the casing and having arms extending from one side thereof provided with tripping lug engaging surfaces, an extension on said tripper loosely mounted in said recess, a spring on said extension interposed between the portion of the casing adjacent the recess and said tripper, and a handle extending outwardly from the tripper through the notched slot and cooperating with the sides of the casing adjacent said slot for securing said tripper to permit the raising or lowering of the rack bar by the pawls.

In testimony whereof, I affix my signature, in presence of two witnesses.

DOMENICO COSTARELLA.

Witnesses MARIE GRAY, FLORENCE BoUoHAnD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. 0.

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