US1080375A - Expansion-lift. - Google Patents

Description

M. LSBNDBRLING.

EXPANSION LIFT.

APPLICATION FILED DBO. 30. 1911.

Patented De@.2,1913h.

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EXPANSION LIFT.

APPLICATION FILED DB0. so. 1911.

1,080,875, Patented Deo. 2.1913.

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EXPANSION LIFT. APPLICATION FILB 13110.30, 11111.

1,080,375. Patented 1160.211913.

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ATTORNEYS UNITED STATES MARTIN L. SENDI'EIRLING, OFJERSEY CITY, NEW JERSEY.

EXPANSION-LIFT.

To all 'whom t may concern.'

Be it known that I, MARTIN L. SENDER- LING, a citizen of the United States, and a resident of J'ersey City, in the county of Hudson and State of New Jersey, have invented a newr and Improved Expansion- Lift, of which the following is a full, clear, and exact' description.

Among the principal objects which the present invention has, in view are: to provide a lifting mechanism having a pivoted base to permit a lateral swing of'said mechanisin thereon; to provide a thrust member for said mechanism, pivotally mounted thereon to rock in' a plane perpendicular to Q the plane of rotation of lsaid base; and to provide aV lifting mechanism having terminal thrust' members and anv intermediate flexible expansion member to separate said thrust members, and pivotally connected with said thrust .members `to permit the disposition thereof in angularlywlisposed planes.

One embodiment ofthe present invention is shown in the accompanying drawings, in which- Figure l is a side elevation of a lift constructed and arranged in accordance with the present invention; Fig. 2 is a horizontal section taken on the line 22 in Fig. 1;

*Fig 3 'is' a sectional elevation of"'a'bottom fragment of the mechanism shown in Fig. 1, the link members thereof being shown in expanded arrangement, andl the base and operating screw being broken and contracted; Fig. et is a horizontal section of the toggle levers taken on the staggered line L1---11 in Fig. 1; Fig. 5 is a vertical section taken on the line 5*?) in Fig. 1; Fig. 6 is a vertical section taken on the line 6--6 in Fig.

3; Fig. 7 is a detail view of an upper frag` mentof the expansion member, showing in dotted lines the angular disposition of the thrust platforms; Fig. 8 is a vertical section taken on the line 8-8 in Fig. 9; Fig. 9 is a view of an upper or outer end fragment of a lift constructed in accordance witlia modified form of the i present invention; Fig. 10 is a` modified form of the construe couples, shown in longitudinal section.

As seen in the accompanying drawings, the lift is provided with a base plate 11.

Specification of Letters Patent. Application filed December 30, 1911.v Serial No. 668,697.

Patented Dec. 2, 1913.

`At both ends of the ards 12, to form bearings forthe ends of a Screw-threaded shaft 13. The shaft 13 has ends reduced to form journals to rest in the bearings on the standards 12 and below bearing caps 14. The reduced ends 19 of the standards 12 and the caps 14: .forni bearings for the bracket ends 15 of a pivot bai' 1G, to permit said bar and structure supported thereby to swing independently of the shaft 13. The bar 1G is T-shapcd in cross section, having a centrally-disposed pendent flange 1T. The flat top of the har lfiforms a runway for the base plate 20 which is directly connected with the pivot blocks 18, as seen best in Fig. L1 of the drawings.

-The base plate 20 is provided with downwardly-extending flanges 21, which 4flanges infold the bar-1G. The base plate 20 is separable from the pivot blocks 18, so that said blocks may be placed in position from above, so that grooves formed vertically therein may register with guide flanges 22 with which the nuts 23 are furnished. The nuts 23 above referred to are provided with threads to register with the threads of the screw shaft 13. lhethreads of said shaft, at opposite ends thereof, are relatively reversed; that ris to say, the threads have a rightand left-handed pitch, meeting at the centerof the shaft midway between the standards 12. The nuts 23 are disposed equi-distant from the middle of the shaft, and whenso disposed, receive the blocks 18, to be thereafter held thereby from rotation.

The shaft 13 is rotated by any suitable means, that shown in the drawings consisting of the crank handle 24. (See Fig. 3 of the drawings). By rotating the shaft in one direction, the nuts 23 and pivot blocks connected therewith will move toward the center, 'and when rotating in the reverse direction, said nuts and pivot blocks will move fiom said center.` The pivot blocks 18 are both provided with trunnions The truiiiiions 25 form bearings for the ends of levers 2G, 27 and 28 and an auxiliary lever 29. The auxiliary lever 29 is paired with the central lever 28 in the first or bottom couple of the expansible structure or lazytongs, and 4is not repeated in the superposed couples.

base plate 11 are stand-v -ln Fig. 2 -of the drawings is shown the relative disposition of the levers 26, 27 and 28 and auxiliary lever 29. In Fig. 4 of the drawings is shown the relative arrange- 'ment of'levers-30, 31 and 32. By the employment of the auxiliary lever 29, the structure is materially reinforced at the point where the initial force is applied to open the couples forming the lazy-tongs hereinafter described. Said auxiliary lever-is a straight 'bar having perforations formed therein to form bearings upon one of the trunnions as well as the connecting pins 33, 34 and 35. The main portion of the lever 28, as shown`in Fig. 2, is disposed centrally between the' levers 26 and 27, and in a plane coincident with `the centeref the shaft 13. To accommodate this' disposition of the lever y 28, it is provided with an'elongated hub 36,

which-is perforated to receive the`pin 33, to be thereby operativelyconnected with the auxiliary lever 29. .The hub. 36 is providedwith a relatively short arm 37, the vopposite end whereof is perforated to receive the trunnion 25 on the blockv 18. The length of the hub 36 is regulated to accommodate the separation or disposition of the trunnions 25. The lever 28 is suitably provided withA a hub 38 to receive on the `median plane of the lazy-tongs thepin 34, and at the end of the'lever' the pin 35. Thehub 38 through which the pin, 34 passes, forms a spacing member for the levers26 and 27. The levers 26 and 27 'are provided with perforated hubs I 39- and 40, respectively,-through which a pivot pin 41 extends. The hubs 39 and 40 are provided with short arms 42, the ends whereof are perforated to receive the trun'- nions 25 of the block l18 adjacent thereto. The levers 26 and 27, at their upper or outer ends, are perforated to receive a pivot pin 43'. The pivot pin 43 extends through' perforationsin a hub 44 on the lever 32 of .the

first of the -superposed couples of the lazytongs. The hub 38,'at the end vof the .lever 28, is perforated to receive the pin 35.` The pin 35 passes through, and forms the pivot for, the auxiliary lever 29 .and the levers 30 and 31 of the first of the superposed couples of the lazy-tongs. Each of thesucceeding couples going to make up' the lazy-tongs shown in Fig. 1 of the drawings consists ofv a lever 32 having a hub 44 at the lower end, a hub 45 at the-upper end, and an intermediate hub 46 centrally located between the hubs 44 and 45. The hubs are connected by the' levers 30 and 31 inthe manner illustrated, and progressively; that is to say,

each pair of levers 30 and 31.`is connected i with a hub 45 on a lever y32,-by means of the pins 62 of the'couplev next below said pair of levers, and is connected with-the hub 46 of the lever 32 corresponding in the couple with said levers 39e-nd 31, and with'the hub 44 of the :lever 32gnext `above said couple.

Each of the levers 32 is connected inthe same vprogressive manner with, first, the

upper ends of the levers 30 and 31 of the adjacent lower couple, With the levers 30I and 31 of the same couple at the median o rtion-thereof, and with the levers 3() and 31 of the next succeeding upper couple, it being understood that each couple consists of the paired outside levers '30, 31 and the corresponding inside lever 32, the same being connected at their respective centers by the pivot pin. 47. As many of the couples above described as is deemed necessary are in this manner united. At the upper end of the' couple pile, a platform or head 48 is connected by means of outside levers 49. and an inside .lever 50 to the upper couple of thel above-described pile, by means of pivot pins 51, which extend through pivot lugs 52ex-v tended from the under side of and atthe '-end of the platform or head 48.

Itwill be noted by reference to Figs. 1y

and l7 of the drawings that the levers 49 agnd the lever 50 are not centrally connected.

By this arrangement, the platform is permitted to rock or be inclinedl relative to the vertical center of the'lazy-tongs, as shown by the dotted lines in Fig. 7 ofthedrawings.

Aln t'he modified form of the invention, as

shown in Figs. 8 and 9, the platform 48 is tongs, arid byv employing. the bolt 54,-fthe head 53' maylswing--ltransverse said couples,

forming thereby Y. head 53 with thelifz'y-tongsfto' accommodate in disposition or 'tilt theebjec being moved bythe herein-described lif From thefforegoing, itwvill. beunders't'ood that as the shaft'13 'is rotated to. c'ause the universal joint for the nuts to lmove toward the center of said shaft, the levers 26 and 27. on the one side of the pin 34 areuplifted, using said pin as a fulcrum,'and 'lifting the weight carried at the outer end'of said levers by the pin 43. Correspondingly, the levers 28 :and 29, operating through the pin 35 at the outer sentedby the levers v30 and 31 `of the next succeeding superposed couple of the lazytongs. Correspondinglyl and cOrdinately, the various paired levers 30'and 31 and the various single levers 32 operate to pivot on -thepins 47, to open upward, permitting lend thereof, lift the'l weight as y repreand parts connecte permitted to yswing to' accommodatesthe pofsition of the object being operated upon or lifted.

therewith "are spread, withl the result that the various couples are laterally expanded to draw; ltheing ltogether vertically, operating to produce the' result of lowering said platform or head and the load carried thereby. i

In the :normal position of the couples constituting the present lift, they are vertically nested, as seen in Fig. 1 o'f thedrawings. In this position, the pivot blocks 18 are separated to the limit of their outward stroke, 'and if not otherwise protected, the threads of the shaft` 13 would be exposed for accumulation oft dust or grit, which subsequently would grind and cut said threads of the shaft 13 and those of the nuts 23. It is to avoid this that I have provided the covering tubeGO. The tube G0 may be constructed of any suitable material, and is secured to the pivot blocks 18.

j To avoid the collapsingof the tube `60 to clog the threads o f the shaft 13, I provide a spiral spring 61, as seen best in Fig. l of the drawings where the tube is partly cut away to Iexpose the same. The `spring 61 is preferably constructed with as few as practical convolutions or turns, in order that the same may not form an obstruction for the juxtaposition of the pivot blocks 18 when moved to the center of the shaft 13, as seen in Fig. 3of the drawings. In the position shown in Fig. 3 of the drawings, it will be noted that the tube 60 is compressed by the blocks 18 and the nuts 23 contained therein. i

'In the modied form of the construction shown in Fig. 10, provision is made for varying the separation between the levers 30 and 31 ,with` greater facility than would be permitted by the employment of the hubs 44 and 45 permanently mounted upon the lever 32. I n the form lof the construction shown in Fig. 10, the lever 63 isnot provided with a hub'such as 45, but is perforated to pass a bolt 64. The bolt'64 is provided with nuts 65, 'the fianges of which bear against the ends of thimbles 66 and the sides of the levers 30 and 31, to compress the same toward the lever 63. The intervening space between the sides of each of the levers 63 and the connected levers 30 and 31, is regulated by the length of the sleeves 67.

It is obvious that when the above-de-l scribed construction is employed, the trans- By reversin the shaft 13, the nuts 23 verse dimension of the lazy-tongs may be infinitely varied.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. An expansion lift, comprising a screwthreaded shaft, a pair of nuts spaced apart on said shaft and in screw-threaded engagement therewith, a pairof upwardlyand inwardly-extending links carried by each of said nuts, one on each transversely opposite side thereof, and a bolt connecting the outside link `fastened to one nut with the outside link fastened tothe vother nut, at a point substantially intermediate the length of said links, the upper end of one of the pair of links having a pair of links pivoted thereto, thefreel end of the other pair of links having a single link pivoted thereto and positioned between said last-mentioned pair of links.

2. In an expansion lift, a toggle joint, comprising two parallel links, a single link pivotally connected to the ends of said firstmentioned links and positioned in a plane extending between the same, and a second pair of links pivoted on opposite sides of the free end of said single link.

3. An expansion lift, comprising a screwthreaded shaft, means supporting said shaft at opposite ends thereof, a track supported by said means, adjacent its opposite ends, a nut in threaded engagement with said shaft, a housing carrying said nut, means permitting. a vertica movement of said housing 'relative `to said nut, and a slidin connection' between saidhousing and said track.

4. In an expansion lift, a screw-threaded shaft, a toggle joint carried by said shaft, 105 so that the rotation of the same will actuate said toggle joint, a supporting platform carried by said toggle, and a connection between said toggle and said platform, permitting said platform to assume an angular posit-ion 110 with reference to the line of movement of said toggle.

5. In combination with a, threaded shaft, nuts ycarried'by said shaft, a toggle carried bysaid nuts, a housing for said nuts, and a 115 track supporting said housing, said track rotatably mounted relative to said shaft.

6. In combination with a toggle, a supporting platform, and a link connection between said toggle and said platform, per- 120 mitting said platform t0 swing in two directions at right angles to each other.

7. In combination with a shaft having a. set of right-hand and a set of left-hand threads thereon, a nut in engagement with 12b each of said sets of threads, a covering inclosing said shaft between said nuts, and means `maintaining said covering spaced from said shaft.

8. In an expansion lift, a toggle` having 130 three links spaced' apart transversely, two In testimony whereof I have signed my of said links being connected. name to 'this specification in the presence of l -9. In combnaton,a screw-threaded shaft, two Subscribing witnesses.

I nuts mounted on said shaftr a toggle oon- MARTJEN L. SENDERLING. 5 nected with and actuatedby said nuts, and Witnesses:

a support 01' said nuts adapted to take the W. S. ORTON, Weight of said toggle 0E said shaft. JOHN l). DAVIS/.A

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