US1443823A - Man lift - Google Patents

Description

Jan. 30, 1923.

1,443,823. C. H. MILLER. MAN LIFT.

FILED OCT. 25, 1921- 5 SHEETSSHEET 1- Jan. 30, 1923. I 1,443,823.

C. H. MILLER.

MAN LIFT. man OCT. 25. 1921'. 5 SHEETSSHEET 4.

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a C. H. MILLER.

MAN LIFT. v FILED OCT. 25, 1921.. i 5 SHEETS-SHEET 5- 8 moawlfoz Fatented Jan. 30, 1923.

warren mm PATENT OFFICE.

CHARLES H. MILLER, OF LIBERTY'TOWNSHIP, JEFFERSON COUNTY, IOWA.

MAN LIFT.

Application filed October 25, 1921. Serial N0. 510,212.

To all whom it may concern:

Be it known that 1, CHARLES H. MILLER,

a citizen of the United States, residing in This invention relates to elevators such as are actuated by the passenger, and more especially to the brakes therefor; and the object of the same primarily is to simplify and yet improve the construction set forth in my United States Patent Number 1,382,211 issued June 21, 1921. Substantially the same principle of operation prevails herein, but for the toggle mechanism and linkage of my former patent I have substituted a simpler automatic brake herein composed of a plurality of triangles linked to rock in unison and apply the brakes with great power excepting only when the carriage contains a passenger of average weight.

Structural details are simplified so that greater strength is secured with less total weight. The reader is referred to my formerpatent for a full description of the operation of a lift of this kind. The following specification gives the operation briefly and the structure of parts asshown on the accompanying drawings, in which Figure 1 is an elevation of this manlift showing the position the parts assume when its platform bears a passenger of average weight, the brakes being released.

Fig. 2 is an elevation of the upper portion of the lift slightly modified, the brakes here being applied.

Fig. 3 is an enlarged detail of the preferred form of rocker, showing how its cam face passes the roller under the impulse of pressure on the pedal. I

Figs. 4 to 8 are sectional views taken on lines in Fig. 1 bearing the same numbers respectively.

Fig. 9 is an elevation and Fig. 10 a section-both enlargedto show the crown and thii. attachment of the yokes to the master bo t.

Fig. 11 is a plan View of the platform, showing some of the floor plates removed.

The car frame is a rolled steel T-bar whose shank is cut and mitered so that the bar can be bent twice at right angles to produce a horizontal si-ll 3 standing below the platform and two upright side arms 1, 1 connected by a pair of beams 2 of U-shape with their backs toward each other but spaced for theparts which must pass between them; thus the entire frame is U- shaped in side elevation with its arms connected near their upper ends, as seen in Fig. 1. The heads of the side arms 1 are outermost, and as the car ascends and descends these heads travel inside steel strips or bands 4: secured within and extending the full length of the elevator shaft; also provision may be made to have said heads engage the usual shaft guides if desired. The side bars 1 are reinforced at their upper ends by strips 6 secured to the edge of the T-shank, and. also secured between the beams 2 as seen in Fig. 7; and these strips stand within the upper portion orv head of the car. .Within its lower portion is movably mounted the carriage which includes the platform and its supports. Links 7 loosely connect the upper ends of the side arms 1 with a crown (see Figs. 9 and 10) made up of two L-plates 8 riveted together and pierced by a master bolt 9, and two yokes 10 hang from this bolt with their arms diverging in pairs, being secured in plates 11 as seen in Figure 8. Spaced spreader bars 12 are secured beneath the plates, and they have rollers 13 contacting with the side arms 1 as shown. From said blade 16bolted between the plates 8, pass-' ing thence loosely between the beams 2, and

welded as at 17 betweenthe centers ofthe bars 12; and this blade has a shoulder 18 for a purpose toappear.

The platform (Figures 1 and 11) may be variously made. As here shown,f0ur joists 20 are held parallel by cross bars 21 of L- iron, and floor boards or plates 22 are secured thereon. Brackets 23 carry rollers 24 serving as guides on the side arms '1; and Figure 11 shows blocks 25 which may be employed when the manlift is used in a the platform is a standard or bracket 26 carrying a pulley 27 for an. operating rope R secured at its upper and lowercnds within the elevator shaft and making a double or S-bend within the car. After leading under this pulley, the rope passes upward. over another pulley 2S pivoted at 29 to one of the beams 2, and thence downward wit in the shaft; and hence the operator always has" a stretch of rope .on which to draw downward, whether he desires to ascend or descend. 7

The T-head of each side arm 1 opposite the reinforce is enclosed in U-bar constituting a brake shoe 31 and the contiguous faces of the shoe and jaw may have appropriate brake lining it desired. The webs oi each shoe pass the edges of the jaw and are connected by bolts 30 passing through slots 32 in the T-stem so that the shoe may move horizontally but not longitudinally with respect to the jaw. Qn the uppermost bolt are pivoted twin triangular brake levers 33, and on the other bolts other twin but smaller triangles 3%. all pivots being at the centers of the bases of the triangles; while links 35 are pivoted to the triangles and cause them to'turn in unison on their pivots. The inner ends 01 the larger triangles or levers 33 straddle the bar '16 and have rollers 37 which underlie the l.. plates 8 of the crown. If desired, the link be extended downward as at 35 and a contractile spring 38 connects it with a bracket or ear 39 on the frame. as seen in Figure i.

From a counterbalancing weight il :1 eable C leads over pulleys. down the shaft,

and is it-seli forked or is connected with fork arms 33' which in turn are connected with the brake levers 33. he parts are of such weight that, when a pas enger of average weight steps upon the platform is supposed to be the case in Fig. l. the bar 16 is moved downward with respect to the head which latter is held. to the straps l by the grip of the brakes, all triangles turn on their pivot-s, and the brakes are automatically released; hence the weight W should counterbalance the car and a passenger of average weight. If child or a person below average weight steps onto the platform. the parts remain as in Fig. 2 and the car at rest clamped to the strips at; hence additional weights must be placed on the platform to bring the effective weight or the passenger up to average, and these can be placed on the ground floor and at each landing for the purpose. If an overweight passenger steps on the platform, the levers 33 are swung down beyond the horizontal position shown in Fig. 1, and the brakes are automatically applied; also this occurs if the cable C should part under any condition. Hence I provide an internally threaded tube 40 carried by the beams 2, a screw 41 en'- gaging the same from below and e tendh a but within reach of an adult standing on the platform. By running up this screw and putting the spring under more or less tension, the effect of overweight overcome.

The toot-controlled brake mechanism includes means for drawing the shoes into gripping contact with the stray hy spring pressure. and a pedal near the platform connected with such means whe by i be overcome or cased oil by the passenger will. A U-shaped brake red 50 leads inward from the left shoe and is connect d with the upper end of a brake lever 51.. while a U-shaped brake rod 52 leads inward from the rightshoe and is connected with sa f lever at a lower point. A link 53 connects the lower end of said lever with. a point near the upper angle a substantially triangular rocker and a second link leads from just above such point inward and is connected with a contracti e spring 56 tached to some part of the mechanism hencethe spring normally applies t..e brakes. while also it normally swings the lower angle 58 of the rocker away from the bar 143 as seen in Fig. 2. Near this angle the rocker has a pin 57 moving in a slot 59 in the beams 2., or the pin 67 may move in loop straps 69 as seen in Fig 3 and it. t serve the purpose of the angle 58 as desr ibed be low. Just below the remaining angle 60 oi the rocker it is formed with a cam face 61 riding over a roller or pin 62, and the angle 60 clears this roller when the angle 58 (or pin 67) swings over the shoulder 18 as seen in Fig. 1. Pivoted to the rocker near the cam face is a link 63 which leads to a lever 64;, and from the latter a rod leads downward to a pedal 66 mounted near i l pla form.

W'ith an underweight person on the platform, the foot brakes may not be released. but as soon as the platform descends (as dcscribed above) until the shoulder 18 passes the rocker the passenger may use the pedal. at will to release or ease off the foot brakes and permit the lift to ascend or descend as he wishes.

lVhat is claimed as new is:

1. In a manlit't, the combination with a car including a head and carriage traveling on the shaft. guides. a weight substantially counterbalancing the car and the average passenger, and acable leading from. the weight; of rocking brake shoes in said head coacting with said guides and having levers. said cable being attachedto said. levers for swinging them and applying the shoes when the car has no passenger, and connections between said levers and the carriage whereby connections between them'and said brakelevers. whereby all brakes work in unison 3. The structure specified in claim 1 plus:

means whereby the levers are swung and the shoes applied when the cable parts.

4-. The structure specified in claim 1 plus: means whereby the levers are swung and the shoes automatically applied by an overweight passenger, and means whereby he can nullify his excess effective weight.

5. The structure specified in claim 1 plus: an upright bar rising from the carriage between said levers and having a crown overlying their inner ends. and links loosely connecting the crown and head.

6. The structure specified in claim 1, plus: a second brake mechanism normally applied, and passenger control mechanism therefor leading to the carriage.

7. The structure specified in claim 1 plus: a second brake mechanism, a spring for nor mally applying the same, releasing means therefor leading to the carriage, and means carried by the carriage for preventing the action of the releasing means until said carriage descends with respect to said head.

8. The structure specified in claim lplus: a second brake mechanism including a rocker, means for normally applying this brake, releasing means therefor leading to the carriage, and a bar rising from the car riage and having a shoulder preventing the movement of the rocker to release this brake until said carriage descends with respect to said head.

9. In a manlift, the combination with a car comprising a head and a carriage movably connected and traveling on guides, brake mechanism in the head for application to said guides by the rise or descent of the carriage with respect to the head, a cable leading from a. weight substantially counterbalancing the car and the average passenger, and connections between said cable and brake mechanism whereby the latter is released by the weight of the average passenger only; of asecond brake mechanism within the head, a spring for normally applying it to said guides, passenger operated means for releasing this brake, and a bar rising from the carriage and having a shoulder so disposed as to prevent the release of this brake until the carriage is loaded up to the weight of the average passenger.

10. In an elevator brake, the combination with guide strips fixed in the shaft; of the car whose frame includes side arms traveling inside said strips, U-shaped brake shoes enclosing said strips and their webs passing the arms, triangular brake levers pivoted to said webs and coacting with said arms, means for'rocking the levers, and independ ent means for drawing said sh es inward.

11. The structure specified in claim 10, plus: the first means being controlled by the load on the elevator and the secend under the control of its passenger. 1

12. The 5 structure specified in claim 11, plus: means to prevent the release of the passenger-controlled brake while the car is empty or loaded with less than the weight of the average passenger.

18. In an elevator brake, the combination with guide strips fixed in the shaft, and the car whose frame includes T-shaped side arms with their heads traveling inside said strips and constituting jaws and beams rigidly connecting the T-shanks; of U shaped brake shoes enclosing said strips and their webs passing the edges of said jaws, and means for drawing the shoes toward the aws. v

14. The structure specified in, claim 13, plus: said T-sha-nks having horizontal slots, bolts through such slots connecting the webs of the shoes, twin triangles pivoted on said bolts with their bases coacting with the T- heads, and means for rocking the triangles.

15. In an elevator brake, the combination with the shoes, brake lever, and connecting rods; of a substantially triangular rocker. mounted on a movable fulcrum near one angle and having a cam face near another, alink connecting said lever with the rocker near its remaining angle, means for normally applying the brakes, and manual control means connected to the rocker near its cam, the whole for operation as specified.

16. The structureaspecified in claim 15, plus: a roller over which said ca-m' face travels when the control means is actuated whereby the fulcrum point changes, and a shoulder coacting with the angle near the fulcrum at this time, for the purpose specified.

17. An elevator structure comprising a U-shaped frame, guides for its side arms, a platform movably mounted in the lower portion of the frame, spreader bars movably mounted therein at higher point, connections between the platform and bars, a crown above the bars and connected with them, levers pivoted in the frame with their inner ends underlying said crown, and a supporting cable branched andlconnected with said levers.

18. The structure specified in claim 17 plus: the frame being of T-iron with its head next said guides, and brake shoes enclosing the. guides and the T-heads of the side bars of the frame, said levers actuating such brakes.

19. An elevator structure comprising a U-shaped frame of T-iron bent into a sill and two upright side arms, the T-heads of the letter aflagterl to slide on guides in the shaft esins connecting the arms near their i pet: enrls spreader bars below the beams having rollers mom bly engaging said arms, an uprightcentral ear rising rigidly from the spreader hers and having a. crown, A- shapecl yokes Whose angles are attached to the crown and Whose arms are attached to the spreader bars, aplatform above the frame sill and having rollers movably en- 10 gaging its arms, and truss rocls hung from the spreader bars with their centers underlying the platform.

In testimony whereof I a-tfix my signature.

CHARLES H. MILLER.

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