US1791742A - Hoisting mechanism - Google Patents

Description

Feb. 10, 1931. c. F. osGooD HOISTING MECHANISM 2 Sheets-Sheet l Original Filed Feb. 18, 1927 Feb. 10, 1931. C 'F QSGOQD 1,791,742

HOISTING MECHANISM Original Filed Feb. 18, 1927v 2 Sheets-Sheet 2 l Invzoi: glandes l? 059000Z,

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Patented Feb. l0, 1931 UNITED STA-TES PATENT OFFICE: A

CHARLES F. OSGOOD, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN h l"MACHINERY GOMPANY, A CORPORATION OF MASSACHUSETTS HOISTING- MECHANISM Application led February 18, 1927, Serial No. 169,324. Renewed August 11, 1980.

This invention relates to hoisting mechanisms and more especially to the portable type of hoist.

Portable hoisting mechanisms, particularly those of the double drum type, are largely used for drag scraper work and for what is called slashing in metal mines, in the operation of which a scraper will be dragged back and forth through the ore or other material to be handled. In hoisting mechanisms such as herein disclosed, a reversible type of motor is used with suitable means to drive one drum or the other automatically in accordance with the direction of motor rotation and this causes the drums to be reversely rotatable.

An object of this invention is to provide an improved double drum hoist wherein 4the winding drums are alternatively driven automatically in accordance with the direction of motor rotation. Still another object of this invention is to provide such a hoisting mechanism wherein the drums are yieldably connected to the driving motor, this connection being effected automaticallyin accordance with the direction of motor rotation.

'Yet another object of this invention is to provide an improved double drum hoisting mechanismhaving a single reversible driving motor and separate driving connections between the driving motor and each of the drums', each of these driving connections including a reaction member adapted to be held stationary or released automatically in accordance with the direction of motor rotation. These and other objects of this invention will, however, subsequently more fully appear.

In the accompanying drawings, there are shown for purposes'of illustration two forms which the invention may assume in practice.

In these drawings,-

Fig. 1 is a central longitudinally extending vertical sectional view through improved hoisting mechanism illustrating one embodiment of my invention, parts being shown in elevation.

Fig. 2 is'a transverse vertical sectional view taken on line 2 2 of Fig. 1.

Fig. 3 is a transverse vertical sectional view taken on line 3 3 of Fig. 1.

Fig. 4 is a side elevational view of a hoisting mechanism of the type shown in Fig. 1 but illustrating a modiied form of automatic control for the drums, the view being shown partially in section to illustrate details of construction.

Fig. 5 is a transverse vertical sectional view standing end supports 4 and 5. As shown,

secured by bolts 6 to the frame 2 at one end thereof is a supplemental base frame 7 and this base frame forms a support for a motor 8 which is herein of the reversiblev electric type, although it is obvious that any other suitable type of reversible motor may be utilized if desired. The motor 8 is secured to the frame 7 by screws 9. Secured to the armature shaft 10 of the-motor is a motor pinion 11 and this inion meshes with an internal gear 12 keye at 13 to one end of a longitudinally extending horizontal driving shaft 14, herein preferably arranged parallel with the motor axis and journaled at its opposite ends in spaced alined ball bearings 15 and 16 carried respectively ,Within the end supports 4 and 5. To prevent access of dirt or other foreign substances to the gears 11 and 12 there is provided a suitable housing 17 secured as by screws 18 to the end support 4, thevhousing having a detachable cover plate 19 'to permit access to these gears. .As illustrated, secured as by keys 20 adjacent the opposite ends of the shaft 14 are spur pinions 21 and 22. In accordance with this f illustrative embodiment of the invention, the

pinions 21 and 22 constantly mesh respectively with planetary drum driver gears 23 and 24, each of which is journaled on ball bearings 25 carried by a stub 4shaft 26. The shafts 26 are respectively carried by coaxial relatively rotatable winding drums 27 and 28, as for instance, a haulage drum and a tail rope drumgand these drums are disposed between the supports 4 and 5 and are each l journaled on ball bearings 29 and 30 supported by the transmission shaft 14. Suitably connected to the drums 27 and 28 re.

spectively, are usual drag line cables or ropes 31. It will be noted that in this instance the drum driver gears 23 and 24 constantly mesh respectively with internal reaction gears 32 and 33 suitably secured to end members 34 and 35, respectively. Each reaction gear is provided with a hub portion 34"1 suitably carried by its respective support 4, or 5 and journaled in roller bearings 35". These hub portions also formsupports for the ball bearings 15, 16. Each of the reaction gears 32 and 33 is externally grooved at 36; and suitable brake bands 37 of improved form to be later described cooperate with the bottom surfaces of these grooves.

As clearly shown in the drawings, the brake bands 37 are identical in structure, but are reversely positioned, so that when one is applied the other is automatically released, and consequently when one of the reaction gears is held stationary the other is free to rotate. These brake bands are 0f the automatic type, and each has a loop portion at one end thereof connected at 38 to the end supports of the frame. A transverse pin 39 is carried by upstanding lugs formed on the frame 2, and pivotally connected to the pin 39 is an eye bolt 4() upon which the other end 41 of the band is slidably connected. Springs 42 are disposed on the bolts 40 to constantly force the ends 41 of the bands 37 outwardly against a nut 43 threadedly connected to the eye bolt; and these springs cause the bands 37 to grip the bottom surfaces of the grooves on the reaction gears when the drums tend to rotate in one direction. Whenever the reaction gears rotate in the opposite direction, the gears acting against the brake bands 37 will tend to raise the free ends of the eye bolts 40 and to compress the springs 42 and thus automatically release the friction of the bands upon the reaction gears. However, the brake bands 37 always have a slight tendency to resist rotation of the reaction gears and consequently the drums always tend -to maintain the drag lines taut. It is obvious that various types of friction devices may be used for holding the reaction gears against rotation in lieu of that shown.

In the operation of this form of improved hoisting mechanism, assuming that the haulage drum 27 is to be rotated and that it be desired Vto release the tail rope drum 28, the motor 8 is rotated in the desired direction; and consequently (see Fig. 2) the pinion 21 is rotated in a counter-clockwise direction while the drum driver gear 23 is rotated in a clockwise direction; and as this gear meshes with the internal gear 32, the latter tends to rotate also in a clockwise direction; but as the gear turns in this direction, the brake band 37 will automatically be applied and consequently the reaction gear is held against rotation. During rotation of the motor in this direction (see Fig. 3) the pinion 22 will also rotate in a counter-clockwise direction, and the drum driver gear 24 will rotatein a clockwise direction; and consequently the internal gear 33 with which the gear 24 meshes -will also rotate in a clockwise direction, the

brake band 37 controlling rotation of the reaction gear 33 being automatically released at that time, due to the swinging of the eye bolt and the compression of the coiled spring 42. It will thus be evident that when the motor is rotated in this direction the reaction gear 32 is automatically held against rotation while the reaction gear 33 is automatically released; and consequently the drum 27 is driven while the drum 28 is rotatable to permit unwinding of the cable thereon. When it is desired to drive the drum 28 and to unwind the cable on the drum 27, the motor 8 is reversed and consequently'the reaction gear 33 is automatically held stationary by its cooperating brake band, while the brake band controlling rotation of the reaction gear 32 is automatically released; and consequently the drum 28 is driven, while the drum 27 is freely rotatable.

In the form of the invention shown in Figs. 4 to 6 the ldriving motor, the winding drums, and the driving connections between the motor and winding drums are identical to that described above in the rst form of the invention. However, in this form of the in. vention a diderent type of mechanism is provided for controlling the reaction gears 32 and 33; and this mechanism specifically comprises ratchet teeth 44 andu 45 formed respectively on the exterior of the'internal gears 32 and 33, these ratchet teeth being reversely arranged for a purpose to be later described. Disposed longitudinally of the hoisting mechansim, and below the winding drums is a rocker shaft 46 suitably journaled at its ends within the frame 2. Secured to the ends of this shaft are pawls or dogs 47 and 48 which are respectively adapted to cooperate with the ratchet teeth 44 and 45. These pawls 47 and 48 are so arranged on the shaft 46 that when one of the same engages its cooperating ratchet teeth, the other pawl is disengaged. It is obvious, however, that other forms of automatic devices maybe utilized in place of the pawls and rocker arm described above, for instance separate spring pressed pawls constantly engaging the ratchet teeth, or a spring controlled crank arm secured to the rocker arm to automatically t l1 gow the pawls When the crank passes its vertical center.

In the operation of this form of the invention, when the motor 8 is driven in one direction, one of the pawls is automatically thrown out from its cooperating ratchet teeth, while the other pawl is automatically thrown into engagement with its cooperating ratchet teeth, this being due to the inclined outer surfaces of the ratchet teeth which act as cams Jr'or forcing the pawls from their engaged position when the reaction gears are rotated in one direction. For instance, when the pinions 21 and 22 as shown in Figs. 5 and 6 are rotated in a counter-clockwise direction, the drum driver gears 23 and 24 are rotated in a clockwise direction and the reaction gears 32 and 33 with which the drum driver gears respectively mesh are also rotated in a clockwise direction, andconsequently (see Fig. 6) the inclined surfaces of the ratchet teeth 45 force the pawl 48 out of engagement thereroll about the internal gear 32 as a trackway and cause the drum 27 to revolve therewith. It will be evident when the motor is reversed, the pawl 47 will be automatically released from the teeth 44, while the pawl 48 will be swung into engagement with the teeth 45, thereby holding the reaction gear 33 against rotationwhile the reaction gear 32 freely rotates; and consequently the drum 28 will be positively driven while the drum 27 will be freely rotatable. These and other operations of this improved hoisting mechanism will be clearly apparent to those skilled in this art.

As a result of this invention it will be noted that an improved double drum hoist is provided having separate driving connections between the motor and drums, each of these connections including reaction gears which are alternatively held stationary or released automatically in accordance with the direction of motor rotation. It will further be noted that an improved double drum hoist is provided wherein the winding drums are alternatively connected to the driving motor wholly independently of manual operation of the connections, the drums being connected in driving relation with the motor automatically in accordance with the direction of motor rotation.

While I have in this application specifically described two forms which my invention may assume in practice, it will be understood that these forms are shown for purposes of illustration and that the invention may be modilied and embodied in various other forms without departing from its spirit or the scope of the ap-pended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a hoist, a reversible motor, a pair of relatively rotatable winding drums, and driving connections between said motor and each of said drums including a reaction gear, and means for alternatively holding said reaction gears stationary automatically in accordance with the direction of motor rotation.

2. In a hoist, a reversible motor, a pair of relatively rotatable Winding drums, and driving connections between sald motor and each of said drums including a reaction gear, a brake band controlling rotation of said reaction gear, and means for alternatively applying and releasing said -bralre band automatically in accordance with the direction of motor rotation.

3. In a. hoist, a reversible motor, a pair of relatively rotatable winding drums, and driving connections between said motor and each of said drums including a drum driver gear journaled 011 each drumand movable therewith during rotation thereof, an internal reaction gear with which said drum driver gear meshes, a brake band encircling said reaction gear for controlling rotation thereof, and means for alternatively applying and releasing said brake bands automatically in accordance with the direction of motor rotation.

'4. In a hoist, a reversible motor, a pair of relatively rotatable winding drums, coaxially arranged and disposed substantially in end abutting relation, and operative driving connections between said motor and drums including a reaction member rotatably mounted at the remote ends of said drums, said driving connections including means operative for alternatively holding said reaction members stationary automatically in accordance With-the direction of motor rotation.

5. In a hoist, a reversible motor, apa-ir of relatively rotatable Winding drums, coaxially arranged and disposed substantially in end abutting relations, and means for alternatively connecting said drums in driving relation with said motor including separate frictional controlling means foreach drum,

said frictional controlling means being automatically alternatively operable in accordance with thedirection of motor rotation.

6. In a hoist, a reversible motor, a pair of relatively rotatable winding drums, coaxially arranged and disposed substantially in end abutting relation, and operative driving connections between said motor and drums including a common driving shaft about which said drums are rotatable, driving pinions secured to said shaft at the ends thereof, driving gearing between said pinions and each of said drums including a drum driver gear journaled on each of said drums, an internal reaction gear with which each of said drum driver gears mesh, and means for holding and releasing said reaction gears automatically in accordance with the direction of motor rotation.

7. In a hoist, a reversible motorfa pair o relatively rotatable winding drums, and operative driving connections between said motor and drums including separate frictional controlling means for each drum, said frictional controlling means being automatically alternatively operable in accordance with the direction of motor rotation for frictionally connecting said drums in driving relation with said motor, the driving connections for each drum including an automatically frictionally controlled reaction gear.

8. In a hoist, a reversible motor, a pair of relatively rotatable Winding drums, and operative driving connections between said motor and drums including a rotatable reaction member for controlling each drum, and means for holding one of said reaction members stationary and for releasing the other member automatically in accordance with the direction of motor rotation.

9. In a hoist, a reversible motor, a pair of relatively rotatable coaxial Winding drums, and operative driving connections between said motor and drums including means'for alternatively connecting said drums in driving relation with said motor automatically in accordance with the direction of motor rotation, said automatic controlling means including brake bands alternatively applied and released.

10. In a hoist, a reversible motor, a. pair of relatively rotatable Winding drums, and operative driving connections between said motor and drums including a reaction member for each drum, and means for alternatively braking one or the other of said reaction members for holding the same stationary d uring drum driving automatically in accordance with the direction of motor rotation.

11. In a. hosit, a reversible motor, a pair of relatively rotatable Winding drums, and operative driving connections between said motor and drums including means for connecting one drum to the motor and for disconnecting the other drum therefrom automatically in accordance with the direction of motor rotation, said driving connect-ions including an automatic brake band for controlling each drum.

l2. In a hoist, a reversible motor, a pair of relatively rotatable Winding drums, and operative driving connections between said motor and drums including a rotatable reaction member for each drum, and means for automatically holding one or the other of said reaction members stationary in accordance with the direction of motor rotation and at the same time automatically releasing the remaining reaction member, whereby one of said drums is automatically driven while the other drum is released automatically in accordance with the direction of motor rotation.

13. In a. hoist, a reversible motor, a pair of relatively rotatable winding drums, and operative driving connections between said motor and drums including drive control means for each drum provided wit-h a brake band controlling driving of the drum, and

means for automatically alternatively applying one or the other of said brake bands in accordance with the direction of motor rotation to effect drum rotation control automatically in accordance with the direction of motor rotation.

14. In a hoist, a reversible motor, a pair of relatively rotatable winding drums, operative driving connections between said motor and drums, the connection between each drum and said motor includinga separate control member, and means for frictionally holding said contro-l members stationary alternatively, said friction means being automatically operable to hold one or the other of said members stationary to effect driving of one of said drums automatically in accordance with the direction of motor rotation.

15. In a hoist, a drive shaft rotatable at will in oppositadirections, a pair of rela.- tively rotatable winding drums, and driving connections between said drive shaft and each of vsaid drums including a reaction gear, and means for alternatively holding said reaction gears stationary automatically in ac.- cordance with the direction of drive shaft rotation.

16. In a hoist, a reversely rotatable drive shaft, a pair of relatively rotatable winding drums, and driving connections between said shaft and each of said drums including a drum driver gear journaled on each drum and movable therewith during rotation thereof, an internal reaction gear with which said drum driver gear meshes, andl means cooperating with the periphery of said reaction gear to prevent rota-tion thereof in one direction automatically permitting rotation in the opposite direction, said last mentioned means operating to preclude rotation of said reaction gears in the same direction whereby opposite rota-tion of said drive shaft automatically effects winding operation of different drums.

17. In a hoist, a. reversely rotatable drive shaft, a pair of relatively rotatable winding drums, and driving connections between said shaft and each of said drums including a reaction gear, and means for alternatively positively holding said reaction gears stationary automatically in accordance with the direction of shaft roatation.

18., In a hoist, a reversible motor, a. pair of relatively rota-table winding drums, and driving connections between said motor and each of said drums including a reaction gear, and means for alternatively positively holding said reaction gears stationary automatically in accordance with the direction of motor rotation.

19. In a hoist, a reversible-motor, a pair of relatively rotatable winding drums, and driving connections between said motor and each of said drums including a reaction gear, and means including teeth on said reaction gears and cooperating shiftable pawls for alternatively positively holding said reaction gears stationary in accordance with the direction of motor rotation. 20. In a hoist, a reversely rotatable drive shaft, a pair of relatively rotatable winding drums, and operative driving connections between said shat and drums including a rotatable reaction member for each drum, and means for automatically holding one or the other of said reaction members stationary in accordance with the direction in which said drive shaft is rotated and at the same time automatically releasing the remaining reaction member, whereby one of said drums is automatically driven while the other drum is released automatically in accordance with the direction of drive shaft rotation.

21. In a hoist, a reversely rotatable drive shaft, a pair of relatively rotatable winding drums, and operative driving connections between said shaft and drums including members, one individual to the transmission of power to each drum, which when held stationary cause winding operation of their respective drums and when released for rotation permit rotation of their respective drums, and means for automatically holding i one or the other of said members stationary in accordance with the direction in which said drive shaft is rotated and at the same time automatically releasing the remaining one of said members.

In testimony whereof I aiiix my si nature.

- CHARLES F. OS OD.

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