US2570941A

US2570941A - Mechanical lifting device

Info

Publication number: US2570941A
Application number: US87255A
Authority: US
Inventors: William M Grigsby
Original assignee: AMERICAN PAPER CO Inc
Current assignee: AMERICAN PAPER Co Inc
Priority date: 1949-04-13
Filing date: 1949-04-13
Publication date: 1951-10-09
Anticipated expiration: 1968-10-09

Description

Oct. 9, 1951 w. M. GRIGSBY MECHANICAL LIFTING DEVICE Filed April 15. 1949 5 Sheets-Sheet l W/LL/FM M. GR/G-SB Y Oct. 9, 1951 w. GRlG-SBY 2,570,941

MECHANICAL LIFTING DEVICE Filed April 15. 1949 3 Sheets-Sheet 2 ATTORN EY Oct. 9, 1951 w. M. GRIGSBY MECHANICAL LIFTING DEVICE 5 Sheets-Sheet 3 Filed April 13. 1949 awe/1m W/LL/FM M GR/6358a ATTORN EYE Patented Oct. 9, 1951 UNITED STATE s PAT ENT OFFICE i invention relates to mechanical liftin devices and more particularly to manually operated mechanical lifting devices adapted to the lifting of rolls of paper to the frame mill roll racks of paper bag and like machines.

' In the operation of many types of machines,

such as paper bag machines and the like, which continuously process paper into various articles the paper used is generally fed to the machine from large rolls. These are usually mounted on aportion of the framework of the machine designed for that purpose and when a roll is used up the roll shaft must be removed and replaced by a new roll of paper. The procedure generally used in putting rolls of paper on the machine is that the operator rolls the paper to the machine and then lifts the roll by hand, one end at a time, onto the machine. This is a difficult andtime-consuming operation and since the rolls are usually quite heavy very often results in the operator straining himself.

A primary object .of the invention, therefore, is the provision of a mechanical lifting device -.for liftin relatively heavy objects or articles,

such as paper rolls. with a minimum of effort and time.

' Another object of the. invention is. the provision of a manually operated lifting device machine, to facilitatethe lifting of rolls of paper 7 tion of the parts after the roll has been lifted into position;

Fig. 2 is a front elevational view showing the application of the device to spaced frame members for lifting the terminal ends of a shaft such as that supporting a paper roll;

. Fig. is alvertic al cross-sectional view of the device taken. along the line 3-3 of Fig. 2 p w Fig. 4 is a cross-sectional view of the device takenialongthe line 4-4 of Fig. 3; and, V

, Fig. 5 is a cross-sectional view of thedevice takenalong the line 5-5 of Fig. 3.

Referring now to the drawings may constitute portions of the framework of; a paperbag or like machine or alternatively may be separately formed frame members suitably constructed and positioned to carry out the purposes of the invention. As illustrated herein each of the frame members In and II preferably comprises a lower portion l2 provided with a suitable supporting base or foot l3 and an upper offset portion l4 connected with the lower portion I2 .by-a horizontal portion l5. At its upper end the lower portion I2 is provided with-a rounded out or concavely curved bearin seat [6 adapted to receive and rotatably support the terminal end of a shaft I! carrying a roll of paper or the like Ila. As is well known in the art paper is continuously Withdrawn from the roll Ila, and utilized in the machine with which it is associated. When the roll of paper has been ex hausted the shaft I! must be removed and a new roll lifted into position as shown in Figs. 1 and Z.

In accordance with the present invention this is accomplished by compound lever mechanisms [8, one of these, being mounted on each of the frame members l0 and H below the shaft-supporting seats 16. Each of the compound lever mechanisms [8 comprises a lower lever I9 and an upper lever 20. The lower lever 19 is pivotally mounted on the lower frame portion I2 adjacent the outer edge thereof so that it may be swung about its pivot from the downwardly inclined full line position to the upwardly disposed broken line position shown in Fig. 1. Preferably the lever I9 is bifurcated as at 2| throughout asubstantial portion of its length and the furcations 22 and 23 thereof disposed on opposite sides, of the. frame portion l2 and pivotally connected thereto by the pivot pin 24.

The end portion 25 of the lever 19 carries a handle 26 having a portion 21 which is preferably square or rectangular in shape for connection with the lever and a rounded portion 28 for grasping by the hand of an operator. The portion 21 of the handle is desirably received in a groove or slot 29 formed in the end portion 25 and is preferably pivotallymounted therein by the pivot pin 30 so that the handle may hang freely downwardly when not in use. To permit the numerals .10 and ll deno,te spaced frame members which free hanging of the handle as shown the bottom 3| of the groove or slot 29 is stopped short of the end of portion 25 as by bevelling the lower end thereof as shown at 32. In the construction shown, the handle 26 may be rotated clockwise (Fig. 1) from its freely hanging position until the bottom of the portion 21 thereof contacts the bottom-3| of .the groove or slot 291 at which time'the handle26 and lever 19 willmove as a unit. When released the handle will again resume its freely hanging position.

Intermediate the ends thereof the leverlfi carries a roller 33, the lower surface of which normally rests against the frame portion l2 when the device is not in use, and'the upper surface of which has rolling contact with the lever 20 as will appear more clearly hereinafter. The roller 33 is preferably mounted on a pivot pin 34 passing through openings 35 in the furc'at-ions 22 and 23 and is disposed between the furcations as shown inF-ig. 5. Since .the size and position of the'roll er -33 will vary according to the .design of the machine with which the device is used additionalfopenings-35 may belprovided in the-furcations 22 and-23 so that the pivot pin 34 may be disposed in desired alternate positions.

The location of the pivot point of the upper --'le'ver 20 is influenced by a number of factors, such as the design of the machine, mechanical advantage desired, and the like. In the construction shown it is located above and to the rear -of'-'-thepivot pin 24 of the lower lever ill in order to obtain the desired mechanical advantage from the particular compound lever arrangement shown. It is also located below and somewhat to the rear'of the shaft-supporting or bearing seat l fi so that when the lever 22] is raised to the broken line position shown in Fig. 1 the shaft will roll downwardly along the upper surface thereof into the seat Preferably the lever is pivoted atzt'on a yokemember 3'? carried bya bracket 38 secured to'theupper framepoltion M in any suitable man'ner-asby the U-bolt 39 and nuts 40. -yoke =member 3': straddles the horizontal frame *portion l5-so as to mount the lever 20 above and inlthe same-verticalplaneas the lever 19. The '-'lever -20-is bifurcated. similarly to the lever l9 so that the furcations 4i and 42 thereof may be disposed on opposite-sides of the lower frame portion 12 andso that the lever i9 may be swung "from the full to the broken line position shown in Fig. 1.

Beyond the furcations4l' and 42 the lever 20 is-provided with a lower bearing surface 43 adaptedto rest on the roller 33 and torolltherealong asthe' levers move upwardly about their pivots. 'The upper surface 44 of the lever 20 is designed to receive and support the terminal end *of a paper. roll or like shaft. To prevent the :shaft'rollingoff the supporting surface 44 as the lever 20 moves upwardly about its pivot a retaining latch45 is provided. The latch 45 is pivotally mounted in a groove 45'of the lever and has a a.

concavely curved end portion 41 which normally "projects above the upper surface 44 of the lever 20 toengage the shaft of a paperroll or the likeand prevent it fromrolling off thelever. The latch -45- is urged to locking position by-a spring 48 mounted in a recess 49 formed in the bottom 50 of-the groove 46. The-sides of theg-roove46 "are'recessed as shown at -5| and 52.130 accommodate the spring 48 and retain it. in position duringpivoting movementof the-latch45. Coun- The 4 terclockwise movement of the latch 45 is limited by the bevelled end portion 53 thereof coming in contact with the groove bottom 50. Clockwise movement of the latch 45 is resisted by the spring 5 and is limited by the side face 54 thereof coming into contact with the groove bottom 50.

When it is desired to place a roll of paper in position on theliframes" tllle a'nd {H the operator "simply move the roll, usually Icy-rolling it, until the terminal ends of the shaft ll thereof are positioned above the lower ends of the upper lever 2 0.- The operator then moves the roll toward the frame members It and H until the ends of the shaftare'positioned above the outwardly projecting 'cur-vedend portions 41 of the latches 45.

* During this operation the shaft ends may or may :not strike the latches 45.

In the event they do the latches merely pivot downwardly into the grooves 48 until the shaft ends have cleared them, at which time they spring outwardly into latching position under .the influence 10f .the spring'si list The roll vis thenlin positionto :be lifted.

In lifting the roll the operator generallypositions himselfwbetween the handles 23 where he can grasp oneof the handles, in each'hand. lHe then'li-fts upwardly on ..the.handles simultaneouslyuntil the upper. and lower. levers on each side; are positioned as, shown in :lorokenlines Fig.1. :At this point the .shafttends roll downwardly. along the surfaces 44 of the leversi2ii and dropinto their hearing seats It. .Thehandles are then lowered until the levers resume the positionshown in fulllines inFig. 1 with the lower portion of the'roller 33.resti-ng.-against.the frame portion if :andv the upper portion. of :the roller in contact with the'lever 20.

The device of the: present. invention. increases the lifting power. of the operator byapproximatelyiEOO percent. Thus a. roll that weighs .500 pounds maybe lifted ini place by the application to catch handle of a lifting force of about, 50 pounds. "The? use ofithe device of this invention also results in considerable savings in time sinceia'roll" may: be. changed in a fraction of the time heretofore required. 7 1

one of the-features .of the compound lever arrangement of the present invention is that the lifting poweris greatest during the initial and final stages of lifting; Thus in the full line position of Fig. I: the point of contact between the roller 33 and lever 25 is at its maximum distance from thepoint at which the end'of the shaft representing the'flload :is' supported thereby a ffording' the :greatest mechanical advantage; As the levers move upwardly-about their pivots the ro11er33 rolls slowly inwardly .Ialong the bottom surface of the lever 25 vandigradually decreases the distance between the point at=which itheload is supported and the pointof contact. between the r'o'llerl33 and lever'2i! thereby diminishing the mechanical advantage. 'Thistakes place until the lever 'w has moved upwardly slightly pasta 7 "the initial and' fin'al stages of liftingwhen it is most neededand -that; the :gradu'al decrease 76 therein during thintrmdiaite stag ofi lifitifig is counterbalanced by virtue of the operator being able to exert a greater lift at this point with little, if any, increase in effort.

Various modifications of the invention described and illustrated will most likely occur to those skilled in the art to which the invention relates and may be made without departure from the spirit of the invention, the scope of which is indicated in the attached claims.

I claim:

1. A mechanical lifting device operable to lift a shaft to a supporting framework comprising a frame member having a shaft-receiving bearing, a lever pivotally mounted on said frame member below said shaft-receiving bearing and having a shaft-supporting portion and a bearing portion, a second lever pivotally mounted on said frame member below said first mentioned lever and carrying a roller thereon adapted to contact said bearing portion, and handle means for pivoting said second lever about its pivot to raise said first mentioned lever upwardly and lift a shaft into said shaft-receiving bearing.

2. A mechanical lifting device comprising a frame member having a shaft-supporting portion, a lever pivotally mounted on the frame member below the shaft-supporting portion, a roller mounted on said lever intermediate the ends thereof, a second lever pivotally connected to said frame member above said first mentioned lever, said second lever having a portion thereof resting on said roller, a shaft-supporting portion on said second lever adapted to support a shaft between the pivot and roller contacting portions, and a handle member connected to said first mentioned lever for swinging it upwardly about its pivot, upward swinging movement of said first mentioned lever acting through said roller to swing the second mentioned lever upwardly and lift a shaft carried thereby to the shaft-supporting portion of said frame member. r

3. A mechanical lifting device as set forth in claim 2 in which said levers are bifurcated and the furcations thereof positioned on opposite sides of said frame member and pivoted thereto.

4. A mechanical lifting device as set forth in claim 2 in which said second mentioned lever carries a pivoted spring-pressed latch adapted to retain a shaft on the shaft-supporting portion of said lever inwardly of the point of contact of said lever with said roller.

5. A mechanical lifting device comprising spaced frame members having shaft-supporting portions adapted to support the terminal ends of a paper roll or like supporting shaft, said frame members having mounted thereon compound lever devices comprising upper and lower lever members pivotally connected to the frame members below the shaft-supporting portions, said lower lever members having rollers mounted thereon, said upper lever members having portions thereof adapted to rest on said rollers, shaftsupporting portions on said upper lever members adapted to support the terminal ends of a shaft, and handle means connected to said lower shafts for swinging them upwardly about their pivots, upward swinging movement of said lower lever members acting through said rollers to swing the upper lever members upwardly to lift the ends of a shaft carried thereby to the shaft-supporting portions of said frame member.

WILLIAM M. GRIGSBY.

' REFERENCES orren The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 263,367 Torrey Aug. 29, 1882 527,879 Potter Oct. 23, 1894 1,220,512 Haselton May 27, 1917 1,677,561 Lamatsch July 17, 1928 1,757,157 Wood May 6, 1930