US1325951A - malicki - Google Patents

Description

.1. IVIALICKI.

JACK.

APPLICATION FILED MAY 3. ISIS.

, Patented Dee. 23,1919.

Z SHEETS-SHEET l.

59 niilllillllllll lh gq I' AMALICKI.

JACK.

APPLICATION FILED MAY 3. 191s.

Patented Dec. 23, 1919.

rrnn STATES JOsEr MALIOKI, OF OIOERO, ILLINOIS, AssIeNOIaJ 'ro TEMPLETON, KENLY a, COMPANY, LIMITED, OF cHIcAGo, ILLINOIS, A CORPORATION OF ILLINOIS.

JACK.

Specification of Letters Patent.

Patented Dec. 23, 1919.

Application ld May 3, 1,918. Serial 110.282,198.

To all whom it may concern: l

B e it known that I, JOSEPH MALIOKI, a citizen of the United States, residing at Cicero, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in Jacks, of which the following is a specification.

The invention relates to the general art .of lifting appliances, and has reference more particularly to that type of lifting appliances commonly known as double-actlon ratchet-jacks that are used for lifting and The present inven lowered. More specifically, the present invention belongs to that type of acks wherein the two pawls are connected by a single elastic extensible and contractible link which is provided with a manual control through which the action of said link on the pawls is changed so as to cause them to engage the ratchet-bar or wheel in either a lifting or lowering manner, asdesired; and another object of the invention is to provide a novel and improved pawl-controlling link of the' character mentioned. Another object of the invention is to rovide an improved auxiliary load-'engagmg appliance designed for removable attachment to and coperation with the head of the lifting-bar that shall enlarge the eld and range ofaction of the implement and enable it tobe readily employed in situations where otherwise its use might be dilicult or impossible. With these and other objects in view which will be apparent from the following detailed description my invention consists in the novel structural features, parts and combinations of a jack substantially as hereinafter described, shown as to a practical and preferred embodiment in the accompanying drawings, and delined as to subject-matter and scope in the appended claims.

'orably formed y Referring to the drawings Figure 1 is a side elevation, in vertical section through the near side of the casing, of a geared jack embodying my present improvements Fig.V 2 is a horizontal section on the line 2 2 of Fig. 1;

Fig. 3 is a detail side elevation of the pawl-controlling link;

Fig. 3a is a detail cross-section on'the line -y of Fig. 3;

Fig. 4 is a sectional detail on the line 4-4 of Fig. 1;

Fig. 5 is a detail elevation, broken vout between its ends, of the handle lever;

Fig. 6 is a top plan view of the head or cap of the lifting-bar.

Figs. 7 and '8 are detail views of the ratchet-wheel, pawls, and pawl-controlling and actuating devices, showing respectively the relative positions of the parts at the downward and upward limits of the swing of the 'handle lever when the pawl-control mechanism is set for the lifting operation.

Figs. 9 and 10 are detail views similar to Figs. 7 and 8, showing respectively the relative positions of the parts at the upward and downward limits of the swing of the handle lever when the pawl-control mechanism is set for the lowering operation.

Fig.' 11 is a detail side elevation of the dogging pawl.

Referring to the drawings, 10 designates as an entirety the frame or housing of the jack that is formed with a vertical slideway 11 in which the lifting-bar 12 is adapted to reciprocate, and, in its upper portion, with an approximately circular chamber 13 that contains certain of the operating parts. A

y shaft 14 journaled in the opposite side walls of the chamber 13 carries a pinion 15, prefintegral therewith, that meshes with the rack teeth 16 on the forward face of the lifting-bar 12, by means of which the latter is actuated, and said shaft also has rigidly keyed thereon a ratchet wheel 17 this construction substantially following that disclosed in Letters Patent to Templeton, No. 1,143,558, dated June 15th, 1.915.

Fitted in the opposed openings 18 in the side walls of chamber 13 are hardened steel 20, and in said bearings are journaled the ing 24, one ofsaid ends being open on top,

as indicated at 27, for the passage of the stem of thejpawl in applying the latterA to and removingitfrom its seat.

Pivoted on(a transverse stud 28 (Fig. 4)

' in the lower portion of the chamber 13 is an upstanding dogging pawl 29 that is formed Y with an arm 30 on its lower end that eX- tends toward .the ratchet wheel 17. This arm 30 is connected with the pawl 25 adjacent/to the nose of the latter by an elasticextensible and contracti-ble link designated as an entirety by 31, and best illustrated as to its detail structure in Fig. 3. As therein, shown, this link comprises three half-round members or sections 32, 33 and 34, the members 33 and 34 being less than half as long as the member 32 and disposed with their Hat sides engaging the upper and lower portions respectively of the flat side of the member 32. To preserve the alinement the engaging faces of the link numbers, which slide endwise on each other, preferably have the tongue-and-groove construction shown in Fig. 3a; and the members are held' in coperative relation by spiral springs 35 and 36, .the former encircling the member 33 and theupper part of member 32, and the latterencircling member 34 and the lower part of member 32. Shoulders 332 and 32 on the members 33 and 32 respectively form end abutments for the spring 35, and similar shoulders 34 and 32a on the members 34 and 32 form end abutments for the sprin 36. The member 33 has at its upper eng an apertured extension 37 that engages a pivot stud 38 carried by the liting pawl 25, and the other short member 34 has at itslower end a similar apertured eX- tension 39 that engages a pivot stud 40 carried by the arm 30 of the dogging pawl 29. The two pawls are thus fiexibly connected by the link sections 32, 33 and 34 and their encirclin springs 35 and 36. ,l

Manna ly operable means are provided for placing both of the springs 35 and 36 in compression during'the lifting operation so as to cause both pawls to hug the ratchet wheel, these means comprising the following parts. O n the lower end of the long link member 32vis an extension 41 (Fig. 3) carrying a` lateral pivot stud 42. Pivoted on a stud 43 that is tapped into the end of stud 28 is an elbow lever, one arm 44 of which has formed in its lower side, a notch or half-bearing 45 that engages the upper side of `the pivot stud 42. The other arm 46 of the elbow lever is slidingly engaged by a lateral pin or stud 48 carried by a trigger lever 49, said pin 48 in the raised position'of the trigger lever (Figs. 1, 7 and 8) engaging a notch 47 in the outer-side of lever arm 46 to lock the parts in set position. The trigger lever 49 is fulcrumed on a stud 50 that is*V tapped into the end of a stud or boss 51 in the lower portion of the chamber 13 parallel to the stud 2,8 (Fig. 4), and theouter arm of the trigger lever projects through a slot 52 in the rear wall of the chamber. 13 of the casing in convenient reach of the operator.

When the jack is to be used for raising a load, the trigger lever 49 is raised to the position shown in Figs# 1, 7 and 8. This, through the elbow lever, draws the long member 32 of the elastic link 31 downwardly, placing both of the springs 35 and 36in compression, and the latter, acting through the short link members 33 and 34, cause both pawls to hug the ratchet wheel 17. The engagement of the pin 48 with the notch 47 locks the members of the elastic link in their set position while the jack is being operated. Fig. .7 shows the positions of thevparts at the limit of a lifting stroke of the handle lever, when the handlelever is in itslowest position and the pawl-controlling link is under its maximum tension. Here the upper spring 35 is compressed by the upward travel of the link member 33 as the pawl 25 travels upwardly, while the lower spring 36 is compressed by the upward movement of the link member 34 vcaused by the backward swing of the pawl 29 acting through its arm 30; both springs at their upper ends Vabutting against the shoulders 32 and 32a of the link member 32 which is held stationary by the elbow lever 44. Fig. 8 shows the relative positions of the parts when the handle lever' is at the extreme of its upward swing. Here the upper spring is substantially neutral,'the lifting awl being held against the'ratchet whee both by its own gravity and by engagement of the back wall of the pawl seat with the back of the pawl. spring is still under some compression, urging the doggingV pawl 29 toward the ratchetJ wheel, although the load on the lifting bar holds the dogging pawl engaged with the ratchet wheel during the return or upward swing of thehandle lever'.

When the load is to be lowered, the trigger lever 49 isswung downwardly to the position shown in Figs. 9 and 10. This rees the elbovT lever 44-rom the locking The lower a tooth of the ratchet wheel and at the same time compressing the lower spr1ng36 (from yits lower end) thereby through the` arm 3Q urging the (logging pawl away from the ratchet wheel. rlhe dogglng pawl 1s, however, maintained in engagement with the ratchet wheel by the load until, during the inal part of the downward s wing cf the handle' lever, there occurs a sllght lifting and load-assuming action by the pawl 25 sufficient to free the dogging pawl which then snaps back out ofv engagement with the ratchet wheel. The relatlve posit1ons ofthe parts at this point are illustrated in Fig. l0. As now the handle lever is raised, with the pawl 25 sustaining the load, the link as a whole first contracts and then moves downward bodily, reversing the impulse on the dogging pawl and causing it to engage the next tooth of the ratchet wheel in a position to take the load which it assumes slightly before the handle lever reaches the extreme of its upward During the final part of this upward swing, which releases the pawl 25 from the load, the link is slightly compressed endwise and contracted, as shown in Fig. 9, and the reaction forces the nose of the pawl outwardly clear of the tooth of the ratchet wheel with i' position to engage with the nextl tooth onwhich it has just been engaged and in a the subsequent downward swing ofthe handle lever.

The foregoing describes the cycle of operations both in raising and in lowering a.Y

load. The trigger lever 49 may, of course, be manipulated by hand; but in connection with the handle lever 23 I have provided a simple and covenient expedient whereby the trigger lever may be manipulated in either direction through the agency of the handle lever. Referring to Fig. 5, it will be noted that the outer end of the handle lever is widened and flattened at 23', this widened and flattened portion having a hole 53 formed therethrough that may be 'slipped over the free outer end of the trigger lever;

the handle lever thus serving as a detachable reach handle or like device for manipulating the trigger lever. This is especially convenient when the jack happens to occupy a low position or one otherwise diiiicnlt of' direct access,"as, for instance, beneath Van automobile running gear. By giving to the hole -53 the hexagonal form shown the handle lever is also adapted to' the purposes of a wrench.

Swiveled on the upper end of the lifting ttlbar 12-by a pivot `stud 54 is a head'or cap '55 preferably formed with a slightly concave upper face 56. The forward side of.

the head that overhangs the front side of 'the lifting-bar 12 is formed with a Vertical side with a notch 64 that engages with the,y

rear side of the head 55 of the'lifting bar 1 n the n lanner clearly shown in Fig. 1 to form, with vthe pintles 63, a firm support for the detachable device under a load imposed-on its head 59, and also to anchor the device against tilting under a load imposed on the foot 61. This auxiliary detachable appliance not only' increases the vertical range of actionV of the lifting bar in both directions, but, by reason of 'the swiveled character of the lifting-bar head '55, it enables .the jack, through the foot 61 to obtam a -hold on objects located behind or on either side of the jack, as well as on objects located in front of the jack. i While I have shown my present improvements as embodied in a geared jack, 1t will be vevident that the same may be embodied to. equal advantage in jacks of the well known type wherein the pawls coperate directly with teeth formedon the rear side of the lifting bar. lt will also be manifest that the details ofconstruction herein shown and4 described may be variouslyV modified without introducing any departure from the operative princlples involved or sacriicing any of the advanta les of the invention. Hence, l reserve al such modilications and changes as fall within the Aspirit and purview of the appended claims.

l claim:

1. In a jack, the combination of a ratchet member, a lifting pawl, a dogging pawl, an

endwise elastic link connecting said pawls,

-means for holding said intermediate section in a position to exert endwise spring pressure through said elastic connections on said end sections.

2. In a jack, the combination of a ratchet member, a. lifting pawl, a dogging pawl, an l en'dwise elastic link connecting Isaid pawls` said llnkcomprising end sections articulated izo and abutting against said end sections and the end portions of said intermediate section respectively, and means for lioldingpsaid intermediate section in a position to exert endwise pressure through said springs on said end sections.

3. In a jack, the combination of a ratchet member, a lever-actuated lifting` pawl, a pivoted dogging pawl formed with an arm eX- tending toward said ratchet member, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said liftingpawl and to said arm respectively, an intermediate section having sliding engagement with said end sections, and independent compression springs embracing and abutting against said end sections and the end portions of said intermediate section respectively, and means for holding said intermediate section in a position to exert endwise pressure through said springs on said end sections.

4. In a jack, the combination of a ratchet member, a lifting and lowering pawl, a dogging pawl, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said lifting and lowering pawl and said dogging pawl respectively, an intermediate section, and independent elastic connections between said end sections and said intermediate section, and manually operable means for moving said intermediate section endwise to a position wherein it exerts endwise spring pressure through said elastic connection on said end sections and for locking it in said position.

5. In a jack, the combination of a ratchet member, a lifting and lowering pawl, a dogging pawl, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said lifting and lowering pawl and said dogging pawl, respectively, an intermediate sectionv having sliding en gagement with said end sections, and independent compression springs embracing and abutting against said end sections and the end portions ofv said intermediate section respectively, and manually operable means for moving said intermediate section endwise to a position wherein it exerts endwise pressure through said springs on said end sections and'for locking it in said position.

6. In a jack, the combination of a ratchet member, a lever-actuated lifting and lower* ingpawl, a pivoted dogging pawl formed with an arm extending toward said ratchet member, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said lifting and lowering pawl.

and to said arm respectively, an intermediate section having sliding engagement with said end. sections, and independent compression springs embracing and abutting'against said end sections and the end portions of said intermediate section respectively, andhmanually operable means for moving said intermediate section endwise to a position wherein it exerts endwise pressure through said springs on said end sections and for locking it in said osition.

7. In a Jack, the combination of a ratchetl member, a lifting and lowering pawl, a dogging pawl, an endwise elastic link connecting said awls, said link comprising end sections articulated to said lifting and lowering pawl and said dogging pawl respectively, an

intermediate section having sliding engage- `ment with said end sections, and independent compression springsl embracing and abutting against said end`sections and the end portions of said 'intermediate section respectively, a pivoted trigger lever, and connections between said trigger lever and said intermediate link section for shifting the latter endwise to a position wherein it exerts endwise pressure through said springs on said end sections and for locking it in said position.

8. In a jack, the combination of a ratchet member,alifting and lowering pawl,adog ging pawl, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said lifting and lowering pawl and said dogging pawl respectively, an in-- termediate section having sliding engagement with said end sections, and indepeiident compression springs embracing and abutting againstsaid end sections and the end portions of said intermediate section respectively, a pivoted trigger lever, and a lever between said trigger lever and said link, said last named lever having one arm engaged with the intermediate section of said link, and its other arm adapted to be engaged by said trigger lever to rock the same, whereby to shift said intermediate link section endwise to a position wherein it exerts endwise pressure through said springs on said end sections.`

9. In a jack, the combination of a ratchet member, a lifting and lowering pawl, a dogging pawl, an endwise elastic link connecting said pawls, said link comprising end sections articulated to said lifting and lowering pawl and Said dogging pa-Wl'respectively, an intermediate section having sliding engagement with said end sections, and independent :soA

compression springs embracing and abutting to shift said intermediate link section endwise to a position wherein it exerts endwise pressure through said springs on said sections, and said levers having cooperating means for locking them in set position against the thrust of said springs.

10. In a jack, the combination of a ratchet member, a lifting pawl, a doggino` pawl, link members, including extensile and3 contractile elastic elements, articulated to said lifting and dogging pawls respectively, a bodily shiftable coupling member for said link members through which a thrust or pull on either may be transmitted to the other, and means for shifting said coupling member to, and holding it in, a position wherein it constitutes an abutment for the elastic elements of said link members.

11. In a jack, the combination of a ratchet member, a lifting pawl, a dogging pawl, link members', including extensile and contractile elastic elements, articulated to said lifting and clogging pawls respectively, an endwisc shiftable intermediate member coupled to said link members through the elastic elements of the `latter and operative to transmit a thrust or ull on either to the other, and manually re easable means for shifting said intermediate member to, and holding it in, a position wherein it constitutes an abutment for the elastic elements of said link members.

l2. In a jack,the combination of a lifting bar, a head on the upper end of said lifting bar having front and rear portions overhanging the latter, and a one-piece auxiliary` lifting appliance detachably mounted on said head and comprising a head, a down-A wardly and forwardly inclined limb supported between its ends on the front portion of said lifting-bar head and terminating at its lower end in Va forwardly extending lifter-foot, and a downwardly and rearwardly inclined limb interfittingly engaged Elith the rear yportion of said lifting-bar ead.

13. In a jack, the combination with a lifting-bar having a head formed with a vertical notch in one side thereof and open bearings in the side walls of said notch, of an auxiliary detachable lifting appliance comprising a head portion forming a vertical extenslon of said lifting bar, a depending limb lying in said notch and having lateral trunnions engaging said open bearings and a lifter foot, and an opposltely disposed depending limb notched to engage the sideof saild lifting-bar head oppositel said notched s1 e.

14. In ajack, the combination with a lifting bar having a swiveled head formed with a vertical notch in its front side and open bearings in the side walls of said notch, of an auxiliary detachable lifting appliance comprising a head portion forming a vertlcal extension of saidA lifting bar, a depending .limb lying in said notch and having lateral trunnions engaging said open bearings and a lifter foot, and an oppositely disposed depending limb notched to engage the rear side of said lifting-bar head.

JOSEPH MALICKI.

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