US1396858A - Lifting-jack - Google Patents

Description

W. E. LOMBARD.

LIFTING JACK. APPLICATION FILED APR. 1, 1921.

1,396,858. 1 Patented Nov. 15,1921.

3 SHEETS-SHEET I.

' 1" .1. 12 12 w i g 0 26 O I o .Q 7 MO k 0 Q liwenior W. E. LOMBARD.

urrme JACK. APPLICATION FILED APR. 1. 1921.

1,396,858. Patented Nov. 15, 1921.

3 SHEETS-SHEET 2- W. E. LOMBARD.

LIFTING JACK.

APPLICATKON FILED APR. lll92l. 1,396,858; PatentedNov. 15, 1921.

' 3 SHEETSSHEET 3- 12 a.

UNITED sT r s P a ENr OFFICE.

WALTER E. LOMBABD, .QF ARLINGTON, MASSAQHUSETTS.

LIF TING-JACK.

e To all whom z'tmay concern:

Beit known that I, WALTER EQLoMBARD,

a citizenof the United States of America,

and a resident of Arlington, in the county of Middlesex and State of Massachusetts,

have inventedcertain new and useful Improvements in Lifting-Jacks, of whichthe following is a specification.

This mventionrelatesto lifting jacks and particularly screw jacks which are adapted to lower under the weight of the load.

For the purpose The primary object of the presentinvention is the provision of means whereby the speed of lowering may be controlled by hydraulic means. i i

The invention consists in certain novel features of construction and arrangement of parts which will be understood readily by reference to the description of the drawings and to theclaims to be hereinafter given. l

of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form havingbeen found to give satlsfactory andfreliable results although it is tobe understood that the various instrumentalities of which the invention consists can be variously arranged and organized and the invention is not hmited to the precise arrangement and organidescribed and shownexcept as required by the scope of the appended claims.

Of the drawings; 1 Figure 1 represents an elevation of a 11fting ack embodying the principles of the present invention.

. ings.

.Fig. 2 represents a vertical section of the same. e l e Fig. 3 represents a partial plan of same, a portion thereof being shown in section, and

Fig. 4 t represents an enlarged vertical sectionon line 4, 4, on Fig.3.

Similar characters ind cate like parts throughout the several figures of the draw- In the drawings. 10 is a base having an upwardly projecting threaded extension 11 on which is mounted a casing 12 havinglaterally projecting rectangular flanges 13 and 14 preferably opposite to each other and surrounding openings 13f and 14 giving access-to the inter or of said casing i In a depression 315111 the extens onlll is disposed a bearin plate 16 having an an- I nulargroove in t e upper face thereofln "Specification of Letters Patent. Patented Nd 1921 Application filed April 1,

1921. Serial No. 457,758.

which is positioned a pluralityof anti-frio tlon members 17, the upper portions of which extend into an annular groove ina plate 18 surrounding the hub of a bevel gear 19.

The plate 18 is provided with an apron 20 surrounding the anti-friction members 17 and the lower end of which is closely ad acent the upper face of the plate 16 thereby preventing dust and other foreign substances from coming into contact with the anti-friction members 17.

Centrally disposed in the base 10 is the s uared member 21, the fiatiside faces of w ich coacting with the walls of the openmg in the base of which said member is fitted, prevent said member from rotating about its axis. a i

This member 21 is provided with a cylindrical extension 22 projecting upwardly through the plate 16 and terminating in a reduced cylindrical portion 23 fitted to the bore of the lifting screw 24.

This lifting screw 24 is provided at' its upper end with a flanged head 25 disposed in a recess in theupper end ofthecylindrical load-supporting member 26.

. Thismember26 is secured to the head 25 by means of screws 27.

The load-lifting member. 26 is provided with a tubular extension 28 extending downwardly and surrounding the barrel 29 having ing through the flange thereof! into the base 10.

Meshing with the gear 19 is a bevel pinion 33 having a cylindrical shank 34 revoluble,

in a bearing 35 in the plate 36 closing the rectangular flanged opening 13.

Keyed tothe shank 34 of the gear 33 is a spur gear .37 meshing with a pinion 38on the operating shaft 39 extending through a bearing 40 in the plate 36.

The outer end-of the shaft 39has mounted thereon, an operating mechanism41 which may be of any well-knownconstruction provided with means for disconnecting it from the shaft 39 when it is desired to lower the load. i

ItIisobvious that when the pinion 38 is rotated by means of the operating mechatubular extension 28 may be adjusted verti cally relatively to-the screw 24 when no load is being supported thereby.

'The upper endof the casing 12 is cylindrical and has a bearing face 43 which serves as'a guide for the extension 28 as it is reciprocated vertically.

The lowerend of this extension 28 is also provided with 'a bearing surface 44 which fits the periphery of the barrel 29."

It is obvious therefore that during the lifting of the load the load-lifting member 26 is guided by the bearing surface 43 at the upper end of the casting 12 and by the bearing, surface 44 on the periphery of the barrel 29 while the cylindrical portion'23 extending upwardly into the bore of the screw 24 servesas' anwadditional guide.

T opefationf I I jliVhen the load'is supported'by. the mem- By this means a very rigid support is given to the load-lifting member in whatever position it may be'durmg the l fting ber '26 it'will be prevented from rotating by means of the weight thereon and consequently when the'nutBO is rotated the screw 24 will be compelled to move upwardly.

The flange 14 has secured thereto a closing plate 45 having'a bearing 46 in its lower end in which is mountedthe shank 47 'ofa pinion 48' meshing withthe bevel gear 19.

The plate45 also has mounted therein a revoluble shaft 49 having a worm '50 thereon meshing with a'worm gear 51 secured to a. shank 52. on a pinion 53 meshing with a gea'r54 having pivoted thereto, pawls engaging afratchet 56 secured tothe shank 47 "of the bevel pinion 48.

By means ofthis construction the gear 48 is free to turn about its axis, in one di-,

rection, during the lifting. operation without transmitting movementto the worm and the intermediate gears 51, 53 and 54.

. lVhen, however, the load is being lowered under its weight, the downward movement of thescrew 24"will. rotate the worm 30 in theopposite direction,'this rotary movement being transmitted through the gears 19 and 50 thereby? fi lii f d; rm shaft'49 to be rotated. 1 l

'The closing plate'45 has formed thereon a chambered extension 57 having a cylindrical chamber 58in which is'mounted an eccentric 59 securedtothe' end of the worm shaft 49.

The chamber 58 is closed by the plate 60 secured to the casing 57 by'bolts 61.

The shaft 49 is in axial alinement with the center of the chamber 58 and surrounding the eccentric 59 is an annular piston 62 the periphery of which is continually in contact with the inner wall of the chamber 58 at some point during the rotation of the shaft 49.

The casing 57 has mounted therein an oscillating, cylindrical, slotted member 63 in the slot 64 of which reciprocates the radial blade or extension 65 formed upon the annular piston 62.

This radial blade or extension 65 has a fluid passage 66 extending therethrough and communicating at its outer end with one end of a chamber 67, the opposite end of which communicates with a valve chamber 68.

In the valve chamber 68 is a cylindrical bushing 69 in which the valve 70 is mounted, said bushing being provided with a plurality of ports adapted to register with ports in the valve 7 O.

The valve 70 is provided with a port 71 communicating with the chamber 67 and a port 72 communicating with the chamber 58.

It also has a port 73 communicating with a passage 74 partially surrounding the cylindrical chamber 58, said passage 74 having a reverse bend at 75 and terminating near the valve 70 at 76.

The casing 57 has upwardly projecting cars 77 provided with hearings in which is mounted the revoluble shaft 78 having an operating head 79 secured to one end thereof and a. washer 80 at the other end thereof, this washer 80 with the head 79 preventing end movement of said shaft 78.

Between the ears 77 the shaft 78 is provided with a helical thread 81 on which is adapted to be reciprocated a nut 82 having trunnions '83 extending into slots 84 formed in the end of an arm 85 secured to the reduced end 86 of the valve 70.

It is obvious that by rotating the operating head 59, the nut 82 will be moved endwise of the screw 81 causing the arm 85 to be oscillated about its pivot thereby effecting the oscillation of'the valve 70 about its axis i .7

to close the ports 71 and 72 or open them to any desired degree.

When the member 26 has been raised to the desired point. the valve 70 is closed and the lifting mechanism is disengaged from the shaft 39.

' As the interior of the chambers 58-67 and passage 74- are completely filled with liquid, it is obvious that the eccentric will be provented from rotation about the axis of the shaft 49 as long as the valve 70 remains closed and consequently the load will be retained in elevated position.

During the lowering of the load the shaft 49 is rotated in the direction of the arrow (z asaegaes on Fig. 4 and as soon as the valve 70 is opened the liquid in the chamber 58 in ad Vance of the piston 62 will be free to pass through the passage 66, chamber 67 and valve '70 to the chamber 58 on the opposite Consequently the setting of the valve 70 will provide a very effective means for controlling the downward movement of the member 26 under its load so that any predetermined speed may be attained.

The passage 74 may be dispensed with if desired but preferably this passage is provided to take careof any surplus liquid in case the port 72 should become closed be fore the closing of the port 71 in which case a portion of the liquid in advance of the piston 62 will be forced into the passage 72 under more or less compression.

.As soon as the port. 72 is again opened a portion of the liquid in the passage 7 4 will be free to pass through the valve and its port 72 into the chamber 58.

It is selfevident that the port 73 to the passage, is open at all times without regardto the position of the valve 70. Bymeans ofthis invention there is provided a hydraulic control. for lifting jacks which is positive in operation and which mav bequickly set to permit the lowering of the loadat any desired speed.

It is believed that the operation and many advantages of the invention will be understood without further description.

Having thus described my invention, claim:

a 1. In a lifting jack, a base; a post secured thereto and extending upwardly therefrom;

a member revoluble thereon; a nut in the upper end of said revoluble member; a screw in said nut; a weight-supporting head secured to the upper end of said screw; means for guiding said supporting headin its vertical movement; andmeans for rotating said revoluble member. s

2. Ina lifting jack, a base; a post secured thereto and extending upwardly therefrom;

a member revoluble thereon; a nut in the upperend of said revoluble member; a screw in Bald nuthavlng a cylindrical bore into which extends the upper end of said post;

a weight-supporting head secured to the upper end of said screw; means for guiding said supporting head in its vertical movement; and means forrotating said revoluble member. y

3. In alifting jack, a base; a post secured thereto and extending upwardly therefrom;

amember revoluble thereon; a nut in the upper end of said revoluble member; a screw in said nut; a weight-supportnig head secured to the upper end ofsaid screw; means for guiding said supporting head in its vertical movement; a bevel gear on the lower end of said revoluble member; two pinions meshing therewith; a lifting mechanism adapted to actuate one of said pinions; and a brake mechanism adapted to be actuated by the other pinion.

4. In a lifting ack a base; a post secured thereto and extending upwardly therefrom; a member revoluble thereon; a nut in the upper end of said revoluble member; a screw in said nut; a weight-supporting head sccured to the upper end of said s::rew; means for guiding said supporting head in its vertical movemen.t;a bevel gear on the lower end of said revoluble member; two pinions meshing therewith and diametrically opposed to each other; a lifting mechanism adapted to actuate one of said pinions; and a brake mechanism adapted to be actuated by the other pinion.

5. In a lifting jack, a base a postextending upwardly therefrom; a tubular member revolubly mounted thereon; a nut screwed in the upper end thereof; a screw extending through said nut into said tubular member; a weight-supporting head secured to the upper end of said screw; means for guiding said supporting head in its vertical movement; and means for rotating said revoluble member.

6. In a lifting jack, a base; a post extending upwardly therefrom; a tubular member .revolubly mounted thereon; a nut secured her; a weight-supporting head secured to the upper end of said screw and provided with a downwardly extending cylindrical portion the lower end of which is fitted to said tu' bularmember; means for guiding said supporting head in its vertical movement; and means for rotatingsaid revoluble member.

7. In a lifting jack, a base; a post ex tending upwardly therefrom; a tubular member revolubly mounted thereon; a nut secured in the upper end thereof; a screw extendingthrough said nut into said tubular member; a weight-supporting head secured to the upper end of said screw; a casing provided with a cylindrical bearing surface for guiding the upper end of said supporting head in its vertical movement; and means for rotating said revoluble member.

8. In a lifting; jack, a base; a postextending upwardly therefrom; a tubular mem ber revolubly mounted thereon; a nut secured in the upper end thereof; a screw extending through said nut into said tubular member; a weight-supporting head secured to the upper end of said screw and provided with a downwardly extending cylindrical portion the lower end of which is fitted to said tubular member; a casing provided with a cylindrical bearing surface for guiding the upper end of said supporting head in its vertical movement; and means for rotating said revoluble member.

In a lifting jack, a base; a post extending upwardly therefrom; a tubular member revolubly mounted on said post; a nut in the upper end thereof; a screw extending through said nut intosaid tubular member; a weight-supporting head secured to the upper end of said screw; a casing having at its upper end a bearing for said head; a gear secured to the lower end of said tubular member; means for rotating said gear; an annular grooved plate surrounding the hub of said gear; an annular grooved plate superimposed on said base; and anti-friction members interposed between and positioned in the grooves ofsaid plates.

10. In a lifting jack, a base; apost extending upwardly therefrom; a tubular member revolubly mounted on said post; anut in the upperend thereof; a screw extending through said nut into said tubular member; a weight-supporting head secured to the upper end of said screw; a'casing having at its upper end a bearing for said head; a gear secured to the lower end of said tubular member; means for rotating said gear; an annular grooved plate surrounding the hub of said gear; an annular grooved plate superimposed on said base; anti-friction members interposed between and positioned in the grooves of said plates; and an annular band secured to the periphery of one plate and extending into contact with the other plate.

11. In. a lifting jack a weight-supporting member; means-for rais'ingsaid weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; an. eccentric secured thereto and revoluble therewith; a casing having a cylindrical chamber concentric to said shaft in which said eccentric is adapted to rotate; a piston ring on said eccentric contacting with the cylihdrical wall of said chamber; a radial blade extending from said piston member and having a passage therethrough; an oscillating member having a slot through which said blade extends; and a valve adapt- Y ed to close a-passage in said casing from the outer end of said blade to said chamber.

12. In a lifting jack, a'weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load;

(an eccentric secured thereto and. revoluble therewith; a casing having a cylindrical chamber concentric to said shaft in which said eccentric is adapted to rotate; a piston ring on said eccentric contacting with the cylindrical wall of said chamber; a radial blade extending from said piston member and having a passage therethrough; an oseillating member having a slot through which said blade extends; and an oscillating valve adapted to close a passage in said casing from the outer end of said blade to said chamber.

13. In a lifting jack, :1 weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; an eccentric secured thereto and revolublc therewith; a casing having a cylindricad chamber concentric to said shaft in which said eccentric is adapted to rotate; a piston ring on said eccentric contacting with the cylindrical wall of said chamber; a radial blade extending from said piston member and having a passage therethrough; an oscillating member having a slot through which said blade extends; and a valve adapted to close a passage in said casing from the outer end of said blade to said chamber on the closed side of said blade.

14. In a lifting jack, a weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; an eccentric secured thereto and revoluble therewith; a casing having a cylindrical chamber concentric to said shaft in which said eccentric is adapted to rotate; a piston ring on said eccentric contacting with the cylindrical wall of said chamber; a radial blade extending from said piston member and having a passage therethrough; an oscillating member having a slot through which said blade extends; a cylindrical valve adapted to close a passage in said casing from the outer end of said blade to said chamber; an arm on said valve; and means coac'ting with said arm for moving said valve about its axis.

15. In a lifting jack a weight-supporting member; means for raising said weightsupporting member; a shaft adapted to be rotated only during the lowering of the load; an eccentric secured thereto and revoluble therewith; a casing having a cylindrical chamber concentric to said shaft in which said eccentric is adapted to rotate; a piston ring on said eccentric contacting with the cylindrical wall of said chamber; a radial blade extending from said piston member and having a passage therethrough; an oscillating member having a slot through which said blade extends; a valve adapted to close a passage in said casing from the outer end of said blade to said chamber; an arm on said valve; a revoluble screw; a nut threaded to said screw and movable endwise thereon during the rotation thereof; and a connection between said nut and arm causing the oscillation of said valve during the reciprocation of said nut.

i supporting member; a shaft adapted to berotated only duringtlie lowering of the load; and a hydraulic mechanism coacting with the end of said shaft for preventing the rotation of said shaft when desired and controlling its speed of rotation when permittedto revolve. a i

a 117. In a lifting jack, a weight-supporting member; means for raising said weightssupporting member; a shaft adapted to be rotated only during the lowering of the load;

an eccentric on said shaft rotatable in a closed chamber; and hydraulic means for controllin the rotation of said eccentric in said cham or. a a

18. In a lifting jack, a weightsupporting member; means for raising sald weight-supand means for regulating the passage of the liquid from the chamber on one side of said blade to the other side of said chamber.

19. In a lifting jack, a weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; an eccentric on said shaft rotatable in a closed chamber adapted to be filled with liquid; an annular piston on said eccentric contacting with the cylindrical wall of said chamber and provided with a radial blade having a passage therein communicatingwith said chamber on one side of said blade; and means for regulating the passage of the liquid from the chamber on one side of said blade to the other side of said chamber.

20. In a lifting jack, a weight-supporting member; means for raising said weight-supporting member; ashaft adapted to be rotated only during the lowering of the. load; a casing having a cylindrical chamber adapted to be filled with liquid; a bladed member in said chamber adapted to be actuated by the rotation of said shaft and adapted to prevent the direct circulation ofliquid in said chamber from one side of saidblade to the other side thereof; and means for controlling the fiow of liquid in an indirect passage around said blade.

21. In a liftin jack, a weight-supporting member; means or raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; a casing having a cylindrical chamber concentric with said shaft and partially surrounded by a connecting assage communicating therewith at one end by two communicating passages, said chamber and connecting passage both containing fluid; an eccentric piston secured to said shaft within said chamber and provided with a radial blade having a fluid passage therein communicating with said chamber; an oscillating member in one communicating passage provided with a diametrical slot through which said bladeextends; and a valve in the other communicatingpassage adapted to control the fluid between said chamber and connecting passage. l. l l a 22. In a lifting jack, a weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotatedonly during thelowering of the load; a casing having a cylindrical chamber concentric with said shaft and partially surrounded by a connecting passage communicating therewith at one end by two communicating passages, said chamber and connecting passage both containing fluid, an eccentric piston secured to said shaft within said chamber and provided with a radial blade having a fluid passage therein communicating with said chamber; an oscillating member in one communicating passage provided with a diametrical slot through which said blade extends; and an oscillating valve in the other communicating passage adapted to control the fluid between said chamber and connecting passage.

23. In a liftin jack, a weight-supporting member; means %or raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; a casing havinga cylindricalchamber concentric with said shaft and partially surrounded by a connecting passage communicating therewith at one end by two communicating passages, said chamber and connecting passage both containing fluid; an eccentric piston secured to said shaft within said chamber and provided with a radial blade having a fluid passage therein communicating with said chamber; an oscillating member in one communicating passage provided with a diametrical slot through which said blade extends; and a valve in the other communicating passage adapted to control the fluid between said chamber and connecting passage; said valve having a port communicating with the fluid passage in said radial blade and another port communicating with said chamber.

24. In a lifting jack, a weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; a casing having a cylindrical chamber concentric with said shaft and partially surrounded by a connecting passage communicating therewith at one end by two communicating passages, said chamber and connecting passages both containing fluid; an eccentric piston secured to said shaft within said chamber and provided with a radial blade ing with said chamber; an oscillating member in one communicating passage provided with a diametrical slot through which said blade extends; a valve in the other communicating passage adaptedto control the fluid between said chamber and connecting passage; and means for adjusting said valve about its arms. a

25. In a lifting ack, a weight-supporting member; means for raising said weight-supporting member; a shaft adapted to be rotated only during the lowering of the load; a casing having a cylindrical chamber concentric with said shaft and partially surrounded by a connecting passage communicating therewith at one end by two communieating passages, said chamber and connecting passage both containing fluid; an eccentric piston secured to said shaft within said chamber and provided with a radial blade having a fluid passage therein communicating wlth said chamber; an oscillating member in one communicating passage provided with a diametrical slot through which said blade extends; a valve in the other communicating passage adapted to control the fluid between said chamber and connecting passage; and means for adjusting said valve about its axis and locking it in adjusted position.

In testimony whereof I have signed my name to this specification at Boston, Mass, this 31st day of March, 1921.

WALTER E. LOMBARD.

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