US1606106A - Crane - Google Patents

Description

l Laos-,10a M. sHUTT l CRANE Nov. 9 1926.

Filed Jan. 27, 1923 5 Sheets-Sheet 1 Nov. 9 1926.

M. SHUTT CRA'NE 'Fi1edJan...27, 1923 5 shams-sheet 2 TOR M. SHUTT CRANE Filed Jan. 27, 1925 5 Sheets-Sheet 3 Nov. 9 1926. 1,606,106

5 Sheets-Sheet 4 M. SHUT-r CRANE Filed Jan. 27,1923 ,K

Nov. 9 1926 Nav. 9 '1926. 1,606,106

M. SHUTT CRANE Filed Jan. 27, 19275 5 Sheets-Sheet 5 mvENToR Patented Nov. 9, 1926.

MILO SHUTT, OF ALLIANCE, OHIO, ASSIGNOR TO THE ALLIANCE MACHINE COMPANY, OF ALLIANCE, OHIO, lA CORPORATION OF OHIO.`

CRANE.'

Application Vfiled January 27, 1912-3. Serial No. 615,307..

The present invention relates broadly to cranes, and more particularly to crane trolleys of the plural drum type having improved means for operating the hoisting mechanism and certain other novel features which will hereinafter appear.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of my improved crane;

Figure 2 is a side elevation of the crane;

Figure 3 is an end view of one of the niechanical brakes, partly broken'away to illustrate the ratchet mechanism;

Figure 4 is a sectional view taken on the line :iV-IV of Figure 3; v

Figure 5 is a detail view of an element of the brake;

Figure 6 is a detail side elevation showing the relative arrangement of a hoisting drum and its co-operating sheaves and cable;

Figure 7 lis an end view of the structure shown in Figure 6, and

Figures 8 and 9 are detail views taken at right angles to each other illustratingthe connection of the beam which carries the upper sheave block to the frame.

Referring to the accompanying drawings, the reference numeral 2 designates the trolley frame of a ladle crane, supported on the wheels 3 which run on the rails 4. An electric motor 5 is mounted' on the trolley frame and is arranged to drive certain of the wheels i 3 for moving the trolley along the rails 4 through suitable gear trains 6, 7, 8, 9, k10 and 11. Y A ,p The frame 2 has mounted therein a pair of hoisting drums 12 and a pair of4 electric motors 13 for driving the same. Each drum has rigidly secured thereto at one end thereof aV large gear 14 and each of these gears is connected toa driving motor 13 through a train of gears 15, 16. 17. 18 and 19. The main shafts 20 of the motors 13 are geared together to rotate in unison and at the same speed by means of largeA gears 21. A

The reference numeral 22 indicates the mechanical brakes, one mounted upon an end of each motor shaft v20. Referring to Fig- J ure 4, it will be seen that the motor shaft 20 is formed adjacent its end with a threaded portion 23. Mounted upon the threaded portion 23 is a sleeve 24, internally threaded for co-operation with the threaded portion 23 and having formed integrally with one end thereof the gear 17, and with the other end thereof clutch member 25. Mounted upon the end portion of the shaft 20 beyond the threaded portion 23 and keyed thereto is a Second sleeve 26, this sleeve being held on the shaft by means of a nut 27 and having formed integrally withlone end thereof a clutch member 28. The sleeves 24 and 26' are journaled in the brake housing 2,9 which is secured rigidly to the frame 2, suitableV bushingsV 3(7)` and 31 being interposed between the sleeves and housing.l The sleevesr24 and 26 are formed with interlocking bearing portions 32 and 33 projecting beyond the clutch members and 28 and journaled upon these bearing portions is a friction gear 34 having secured to one face thereof, for co-operation with the clutch member28, a friction ring 3,5 of wood or Vother suitable friction mate-4 rial. As seen in Figures 4 and, the clutch n members 25 and l28 are provided with suitable oil grooves 36 supplied with oil from the interior ofthe housing 29 through the openings 37 in said clutch members.. For permitting the friction gear 34 to rotate in one direction only,othere is provided one or more pinions 38, Figure 3, for co-operation withsaid gear, each of said pinions being journaled upon a pin 39 extending transversely through the housing 29 and fixed against rotation.r Extending diametrically through `a suitablek opening in each pin 39 is a pawl 40 adapted to co-operate with teeth 41 formed internally of the pinion 38. This. construction is of a well known type permitting rotation of the friction gear 34 in the direction of the arrow, Figure 3, but` preventingrotation'thereof in thev opposite div rection.

The `operation of the structure so fargdei scribedis substantially asfollows: assuming that the clutch.v illustrated in- Figure 4 is for controlling the shaft 2O of the motor 13 at the right of Figure 1, in lowering the load the shaft will be rotated in the direction of the arrow, Figure 4, the motor being energized to yoperate at a definite speed in the lowering direction. rlhis will tend to move the sleeve 24 in a directionto back the clutch member 25 away from the friction gear'34, the latter being held against rotation by the pinion 38. VNow the shaft 2O in rotating also rotates the Vsleeve 26 which is keyed thereto and the sleeve 26' isadapted to drive the sleeve 24 through the interlocklili) ing bearing portions 32 and 33, but there is sufficient clearance between the latter to permit the sleeve 24 to be moved longitudinally of the shaft 2O suiiiciently to relieve the friction between the friction gear 34 and the clutch members 25 and 28, as previously explained. In lowering the load, the pinion 17 will ordinarily be driven by the load it-V` self through .the drum l2 and interconnecting gears 14, l5 and 16 rather than through the positive driving connection between the sleeves 24 and 26. It will be apparent that the pinio'n 17 cannot be caused to rotate through the pull of the loa'd at a faster rate of rotation than the rate of rotation of the shaft 20. Whenever the pinion 17 tends to rotate at a faster rate than the rate of rotation of the shaft 20, the sleeve 24 is moved in l'a direction to cause the clutch member 25 to frictionally engage theffriction gear 34 whereby the rotation 'of the sleeve 24 is immediately retarded. -Therefore, by this construction, ythe load is prevented from accelerating the motor during the lowering operation and if the shaft 20 ceases to rotate, the loa-d will be held from falling by the vbrake device.y However, in case one of the motors should 'break down during the lowering operation, its shaft 2O would be operated in unison with'the shaft 20 of the vother motor through the gear 'connection 21 between said shafts. In other words, cach motor 13 has complete control over both motor shafts 2O vand their. respective brakes at all times during the lowering operation, so that the load can be lowered by eitherV motor alone or by both motors together, the brakes functioning to take the str in of the load off the motors and to prevent the loa-d from 'accelerating the vmotors during the loweringvoperation and to hold the load when both motors are stopped.

vices 38, 39, 4() yand 4l.

In raising the load, the shaft 20, `Figure 4, rotates in a direction opposite tothedi'rection of the arrow, and thereforetends to move the sleeve 24 towards the `friction gear 34 so as to clamp the latter between the clutch members and 28, whereby th-e friction gear rotates with the shaft 20,"such rotation being permitted by Ithe ratchet de- It will be apparent, however, that these ratchet devices will hold the load and keep it from falling when the motors are stopped, while permitting the load to be raised by either motor alone, or by both motors together.

It will be apparent from the foregoing that I have provided a construction wherein a plurality of drums can be operated and their respective brake devices controlled by a plurality of motors for raising an-d'lowering the load, or wherein said drums can be operated and their respective braking devicescontro'lled'by any one-of said motors alone for raising and loweringl the load. -It

will be obvious to those skilled in the art that by the use of a plurality of motors, the entire apparatus is operated normally with greater uniformity thanrwould be the case if a single motor was provided. Elow` ever, in certain cases the failure of one ino tor imposes the entire load on the remaining motor or motors, thereby in effect providing -a modified construction broadly equivalent to the use of a single motor. It immediately becomes apparent, therefore, that in certain cases, due to clearance, weight or the like, specifications may call for but one motor.

Referring to Figures 6 and 7 .the reference numerals 42 and 43 indicate upper and lower sheave' blocks and 44 a hoisting cable, the latter having' 'one Vend fastened to an eye member 45 carried by the frame 2. It will be seen that the hoisting cable 44 passes around the drumv l2 and upper and lower sheaves so as to bend always inthe same direction. yThis arrangement has the advantage over constructions in which the hoisting `cable passes around the drum and sheaves in reverse directions that the life of the cable is prolonged. y Y.

By reference to Figures 8 and 9, it will be seen that the lower sheave block 43 has its axle 47 journaled in standards43 carried by the lifting beam 49 `and that the upper sheave block 42 has its aXle 50 journaled in hangers 51 carried by beam 52 whichy eX- tends transversely ofthe frame 2 and parallel to the axis of the drum 12. Said beam 52 has fixed toeach of its yopposite end portions an upwardly extending member 53 carrying 1a pin 54 journaled in the frame 2,. The beam 52 .which Vsupports therupper sheave block 42 is thus swingingly supported in the frame 2. Now Athe starting and stopping of the crane tends to set up oscillations in the lifting beam 49, vbut by supporting vthe upper sheave blocks in a swingingbeam this tendency of the lifting beam to oscillate is largely counteracted, the oscillations being` set up in therswing'ing beam'52 instead. v V n n An important advantage of the invention arises from the provision of a swinging support for the upper sheaves, whereby the oscillations setup in starting'and stopping the crane are largely taken up by the upper sheaves and their supporting means.

I claim:

l. In a Yhoisting apparatus, a trolley frame, 'fa hoisting drum mounted on the frame, a swingable support suspended from the frame with the axis about -which it lswings substantially `parallel to the axis of the drum, saidsupport having links at opposite sides 'thereof Athrough which itis suspended from the said frame, a'sheave rotatlably carriedr'in thesupport, a cableoperatmg aroundthesheave land drum, and a second load-carrying sheave suspended from the first through said cable, substantially as described.

2. In a hoisting apparatus, a vtrolley frame, a hoisting drum on the frame, a beam pivotally suspended from the frame With the aXiS about which it pivots substantially parallel to the aXis of the drum, a sheave suspended from the beam, a `second sheave below the iirst, and a cable passing around the sheaves and connected With the drum, substantially as described.

3. In hoisting apparatus, a trolley frame, a pair of hoisting drums, a lifting beam, and

means for connecting said lifting beam to said drums, comprising a pair ot lower sheaves carried by said beam adjacent the ends thereof, a pair of upper sheaves, a beam supporting each upper sheave and pvoted to the trolley frame to rock about an axis eX- tending transversely thereof, and a cable associated With each drum and the corresponding pair ot upper and lower sheaves, substantially as described.

In testimony whereof I have hereunto set my hand. 1

MiLo sHUTT.

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