US2224529A - Lift - Google Patents

Description

10, 1940. I. c. THOMPSON Em 2.224529 LIFT Filed May '31, 1940 5 Sheets-Sheet 1 TI" III i /%v ATTORN 5.

Dec. 10, 1940.v c. THOMPSON E-T'AL 2,224,529v

LIFT Filed May 31, 194p s Sheets-Sheet 2 i k) Wm Q I kg f L R l ATTORNEYfi.

1940- I I. c. THOMPSON arm. 2.2243529 LIFT Filed May 31, 1940 5 Sheets-Sheet 4 will ill .136 1/6 I l N;- 70 I I 32 0 1 105 I 1NVENT 1 11476 /Z0 ZP l. c. THOMPSON ETAL LIFT Dec. 10, 1940.

Filed May 31, 19 40 5 Sheets-Sheet 5 INVENTOR5. Zruuzg C 7720 D5072, BY ifisiZC/s V m fizz/m,

I ATTO Patented Dec. 10, 1940 UNITED STATES LIFT Irving 0. Thompson, Cadillac, Mich, and Frederick W. Sturm, Fort Wayne, Ind.'; said Sturm assignor to The Wayne Pump Company, Fort Wayne, Ind., a corporation of Maryland Application May 31, 1940, Serial No. 337,972

10 Claims. (01. 254-144) This invention pertains to vehicle lifts for hoists.

' It is an object of this invention to provide a lift which can be installed without the necessity of digging a foundation therefor.

Another object of the invention is to provide a lift which is inexpensive to make and maintain, and fulfills all requirements of manufacture and service.

Still another object of the invention is to provide a lift-wherein only a unidirectional motor need be used, and one having safety devices to maintain the lift in any position and to prevent too rapid lowering of said lift.

Yet another object of the invention is to provide a lift comparable to a so-called four post lift but which takes up a minimum of floor room and height.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation, as will be more ,fully described and particularly pointed out in the specification, drawings andclaims pended hereto.

In the drawings, which illustrate an"embodi ment of the device, and wherein like reference characters are used to designate like parts- Figure 1 is a top plan view of a lift or hoist embodying the invention;

Figure 2 is a side elevation of the lift shown in Figure 1;

Figure 3 is an enlarged transverse sectional elevation taken substantially in the plane as indicated by the line 3-3 of Figure 1;

' Figure 4 is an enlarged fragmentary sectional elevation taken substantially in the plane as indicated by the line 4-4 of Figure 1;

Figure 5 is an enlarged end elevation, partly in section, of the operating mechanism for the lift, the same looking toward the right as viewed in Figure 2; V

Figure 6 is a transverse sectional elevation taken substantially in the plane asindicatedby the line 66 of Figure 5; c

Figure 7 is an enlarged fragmentary sectional elevation taken substantially in the plane as indicated by the line 1--1 of Figure 6;

Figure 8 is a fragmentary sectional top plan view taken substantially in the plane as indicated by the line 88 of Figure 7;

Figure 9 is an enlarged end elevation of one of the operating pulleys for the lift, the same showing the centrifugal brake;

Figure 10 is an enlarged fragmentary sectional Bipelevation taken substantially in the plane as indicated by the line llllll of Figure 9.

"The; lift or hoist illustrated is of the so-called free-wheel type, though of course it is to be understood that a roll-on-type of hoist may be used, and, although no chocks are shown as applied to this free-wheel type of lift, it is of course understood that suitable chocks are used in this type ofliftr The lift consists essentially of the front track members, rear track members, a carriage and operating means therefor, and, in the embodiment shown, the front track members comprise a pair of spaced frames 26. Each of said frames is formed of the base members 22 connected to a vertical member 24, said vertical member being suitably connected to a track member'26 which, in the embodiment shown, may be conveniently formed of a channel. Each track member 26 is formed with a sloping portion 28 and the upper slightly sloping portion 30, and vertical and horizontal braces 32 and 34 may be provided between the base, vertical and track members. 'The portions 30 may conveniently be from 5? to 7 from the horizontal.

The carriage 36 includes the forward transverse inverted angular member 38 over which the wheels of the vehicleto be lifted are adapted to be rolled, and axle members 40 and 42 are provided for accommodating the rollers 44 adapted preferably being provided with guards 48, the upper flanges 50 of which overlap the rollers 44.

The spaced longitudinally extending beams 52 are secured to the transverse member '38 by means of the brackets 54. The rearv ends of the beams 52 are provided with the journals 56 and 58 through which the axle 60 extends. of the axle are provided with the rollers 62 adapted to be received inthe channel shaped The ends tracks64 of the rear track frames, said rear track frames being preferably spaced apart a distance less than the tread of ordinary vehicles,

such as automobiles.

The track members 64 are similar to the track members 26, each having the sloping portion 66 5 9 tovbe received'in the spaced tracks 26, the tracks pulleys 16 maintained in fixed position between the inner journals 58 by the spacing tube 18.

The uprights 10 and 12 form means for supporting the operating mechanism, and said uprights are suitably secured adjacent the tops thereof by means of the transverse brace member 80, and are secured adjacent the bases thereof by the brace member 8|. The brace member 80 is provided with the spaced fastening means 82 which, in the embodiment shown, are eye bolts to which one end of the cables 84 are secured, said cables passing downwardly and around the pulleys 16, and thence back to be secured at their other ends to the tracked or spiral jdrums 85 non-rotatably mounted on the shaft.

A safety latch 80 is pivotally mounted on the shaft 88, being positioned thereon by means of the spaced collars 88, and said latch is provided with the handhold or handle 92 and the hooked end 94 adapted to latch the carriage 36 by engagement with the tube 18 when the :roll'ers'62 have been moved on to the portions 68 ;of the tracks 66. The latch may also be provide'dwith the stop'zfifi adapted to engage the'bracemember 80 to. prevent; the latch .from falling to 1a position where it cannot automatically engage the :memberi18. The latch 90 ispreferably provided with the;s1oping portion 91 adapted toibe engaged'by the sleeve 18 for moving the latch upwardly when it is'.being moved to .lat'chengagingposition.

'Hresh'aftBS is provided with the gear 98., meshing with the gear I00 non-rotatably mounted on thexshaftzIliZ. 'The shaft. I02 is non-rotatably provided with the gear. I04 meshing with the gear I06 non-rotatably mounted on the shaft I08. The shafts .88, I02"and I08 are suitably'journaled as at! L09, -I'I0.and II2 respectively, on the uprights 10.and:12. The shaft I08 is provided witha hand wheel I I4 adapted to rotate the'shaft I08 for the purpose to be morefully'described later.

"Thexshaft I08 is non-rotatably provided with theratchet II6 adjacent the upright 10. The pawl .I :I8is pivoted to the shaft I02 and is adapted to be moved to' engage the ratchet I IE to prevent clockwise movement of the shaft I08 as viewed in Figure 7. The pawl H8 is provided with the handhold I25 and the locking member I22 pivoted to the pawlas at I24, an extension I26' thereof being provided with the locking ledge I28 adapted '50 to engage one flange of the upright 10 to maintain the pawl :in inoperative position. A spring I30 is provided to urge the member I28 toward locking position. It will thus be seen that it is only necessary to move the locking memberl22 toward the handhold I20 about the pivot I24:to

release the locking ledge I28 from locking position to permit the pawl .II8 to be dropped into engagement with the ratchetI I6.

The shaft IIIB- also is provided with the brake drum I32, and the'band brake I34 is disposed around said brake drum, said band brake being anchored 'as at I36 and I38 tothe operating 'lever I 40 pivoted as at I42 to the upright 10. This hand brake may be used to check or arrest downward movement of the carriage-36. The shaft I88 may be provided with the'so'cket I44 with a reception of a hand crank 146 for operating the liftin emergencies, and said shaft is non-rotatably provided-with the pulley I48 connected by the belt I58with the pulley I52 provided on the operating 'shaftcof the motor I54, said motor being supported on the upright 10.

The motor I54 is electrically 'connected'through a suitable conduit I 56 to the switch I58, and said 75 switch is electrically connected to a Suitable source of supply (not shown) through the conduit I60. The switch I58 is provided with the operating lever I62 for opening and closing said switch, and said lever IE2 is provided with the resilient extension I64 extending upwardly in the path of the axle I50 whereby engagement by said axle in moving the carriage 36 on raised position 68 will move the member I64 to open the switch.

The stationary brake drum I66 is secured as at I68 to the upright 10 and is disposed concentrically with the shaft I88. The pulley I48 is b'ossed as at I10 and the shaft I12 is journaled therein. The shaft I12 is non-rotatably provided with the centrifugal lever I14 having the weighted end I16.extending-inwardly toward the shaft I88, the end being bifurcated to embrace said shaft. The lever I 14 is urged in a clockwise direction, as

viewedin Figure 9, by means of a spring I 18, one

end of said spring being secured as at I to the pulley, the other end of said spring being secured as .at I84 toithe lever, the head of thelever being provided with a rubber block I85 for cushioning the *head againstthecentral hubof the pulley. Theinnerend of the shaft- I12 is non-rotatably provided with the lever, I88 loosely pivoted as at I90 to the brake shoe 4-92 disposed to have braking cooperationwith thebrake'drum I66 upon a predetermined speed of rotation of the pulley I48 in a counterclockwise direction as viewed in Figure 19, that is, when the lift is being lowered. The gear train-B8, I00, I-04-and I06 maybe suitably enclosed :byameans of thehousing I94,- andthe pulleys I 48 and I52 and the centrifugal-brake may likewise be enclosed in aihousing I95.

In operation of this form-of lift, let it be assumed that the carriage is in lowered position and a -vehicle, such asan automobile, has been rolled between the frames 20 of the member 38 so that thespacedumembers -52-of the carriage 30 are disposed. in proper positionbeneath the vehicle. Themotorswitch -I58 may then be closed by means of'theiever I62, and operation-of the motor causes rotation of the shaft I08'through the pulleys I52 and I48, and the belt I50. Rotation of the-shaftIOB :causes rotation of the shaft '88 through-the ggear train 405, I04, I00 and 98, thus causing rotation of "the drums 86. Rotation of the. drums-86min wind the cables 84 around said drums, drawing the carriage toward the left as viewed in Figures 1 and 2, to cause the carriage to move up the inclined members 26 and 66.

The carriage will move upwardly until the rollers 44 andv 62 .are respectively received on the portions 30 and 68, atwhich time the lever I02 may'be manually operated toswitch open position, or theraxle 60 mayopenthe switch by engagement andmovement of the member I64. At that time the hook 90 will engage the axle and tubular member vIiIl- -18 to prevent accidental lowering ofnthe carriage.

When it is desired to lower the carriage, and in the event that .theimotor I54 is not a reversible motor, which of course would permit of a cheaper construction being used, the latch. 90 is lifted by the lever 92 and the hand wheel I I4 is rotated to 'slacken the cables 84by rotation of the shaft 88 by means of the gear train I05, I04, I00 and 98. Too rapid downward movement of the carriage 3-5 is checked by the centrifugal brake because, if the carriage moves downwardly too quickly, the shaft 88 will cause rotation ofthe shaft I08 to cause the lever'I14 to move in a counterclockwise direction about its pivot I 12, thus causing the brake shoe I 92 to engage the brake drum I66.

the event it isdesired to stop the carriage at any point, the brake lever MG may be operated to completely arrest rotative movement of the shaft I08 through the brake band I34 and the brake drum I32. The shaft may be locked in any position by meansof the pawl H8 by moving said pawl into engagement with the ratchet H6 in a manner already described.

It is to be understood that we do not wish'to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

What is claimed:

1. In a lift, the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating at its highest point with a portion of less angularity than said first named angle, the track members of one pair of said track members being spaced apart a greater distance than the track members of the other ofsaid pair, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating means for controlling movement of said carriage, and a centrifugal brake operative to reduce the speed of said shaft when said actuating means is inoperative.

2. In a lift, the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating at its highest point with a portion of less angularity than said first named angle, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating means for controlling movement of said carriage, a brake member for checking the downward movement of said carriage, means for preventing movement of said shaft and to maintain said carriage in any selected position on said tracks, and means adapted to be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predetermined position.

3. In a lift, the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating at its highest point with a portion of less angularity than said first named angle, the track members of one pair of said track members being spaced apart a greater distance than the track members of the other of said pair, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by saidactuating means for controlling movement of said carriage, a brake member forchecking the downward movement pf said carriage, means for preventing movement of said shaft and to maintain said carriage in any selected position on said tracks, and means'adaptedto be actuated by said carriage forrendering said actuating means inoperative when said carriage is moved'to a prede termined position. i 4. In a lift, the combination of spaced pairs of track members, 'each'of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating at its highest point 'witha portion of less angularitythan said first named angle, a carriage, anti-friction members adjacent each end of said carriage disposed to be'moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means; a shaft driven by said actuating means for controlling movement of said carriage, a brake member for checking the downward movement of said carriage, and means'adapted to be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predeterminedposition.

5. In a' lift; the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially thesame angle, each track terminating-at its highest point with a portionof less angularity than said first named angle, the track members of one pair of said track members being spaced aparta greater distance than the track members of the other of said pair, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating means for controlling movement of said carriage, a brake member for checking the downward movement of said carriage, and means adaptedto be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predetermined position.

6. In a lift, the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating at its highest point with a portion of less angularity than said first named angle, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed on one of said pairs of track members for moving said carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating means for controlling movement of said carriage,

a brake member for checking the downward ing; at itsrhig-hest rpoint :with :aa'; portion .of 1 less angularity than said first named angle,-"-a carriage, anti-friction membersadjacent each end of said carriage *disposedto be moved'along said tracks, operating mechanism :disposed on one of said "pairs of ,trackmem'bers for moving-said carriage along said tracks to raised or'lowered position, said operating mechanism including actuating means, axshaft driven byisaid actuating means for controlling movement of, said carriage,a'brake member for checking thedownward movement of said carriage, means adapted to be actuated by said carriage forrenderin'g said actuating means inoperative when said carriage is moved to a predetermined position, and means for releasably holding said carriage in said predetermined position.

8. In a lift, the combinationxof spaced pairs of trackxmembers, each of said. track members having parallel inclined tracks, each inclined at substantially the same angle, ,:each track terminating at its highest point' with a portion of less angularitythan said first :named angle, the track members of one-pair of said track members being spaced-apart.agreater distance than the track members of the other of said pair, a carriage, anti-friction members adjacent each end of said carriage disposed to be moved along said tracks, operating mechanism disposed'on oneof said pairs oftrack membersvfor movin said carriage along said tracks toraisedor lowered position, said operating mechanism includingactuating means, -a shaft driven by .said actuating means ,for controlling movement of said carriage, a brake member for checking the downward movement of said carriage, .means adapted to be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predetermined position, and means for releasably holding saidcarriage in said predetermined position.

9.'in-.- a lift, the, combination ofspacedpairs of track members, each of said track members having parall'efinclined tracks, each inclined at substantially the same angle, each track terminating at its highest point with a portion of less angularity than said first named angle, a carriage, anti-friction members adjacent each end of said carriage disposeclto be moved along said tracks, operatingmechanism disposed on one of said pairs-of track' members for moving said carriage-along saidtracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating means for controlling movement of said carriage, and means adapted to be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predetermined position.

'10. In a lift, the combination of spaced pairs of track members, each of said track members having parallel inclined tracks, each inclined at substantially the same angle, each track terminating-at its highest point with a portion of less angularitythan said first named ang1e,'a' carriage, anti-friction members adjacent each end of said carriage disposed to'bemoved along said tracks, operating mechanism disposed on one of said pairs of track-members for moving said'carriage along said tracks to raised or lowered position, said operating mechanism including actuating means, a shaft driven by said actuating meansfor controllingmovement of said carriage, means adapted to be actuated by said carriage for rendering said actuating means inoperative when said carriage is moved to a predetermined position, and means for releasably holding said carriage in said predetermined position.

IRVING C. THOMPSON, FREDERICK W. STURM.

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