US1637338A - Power hoist - Google Patents

Description

R. AQUFONTAINE POWER HOI ST Filed April 50. 1924 2 Sheets-Sheet 1 gwue'nfox Aug. 2, 1927.

R. A. FONTAINE POWER HOIST Filed April '30. 1924 2 SheetQ-Shaet 2 I Patented Aug. 2, 1927.

UNITED STATES ROBERT A. FONTAINE, F MARTINSVILLE, VIRGINIA.

rowan nors'r.

Application filed April 30, 1924. Serial No. 710,066.

This invention relates to hoists, particularly, though not necescarily, designed for use in connection with trucks for the purpose of hoisting the body to effect dumping thereof, and has for its principal object the provision of a novel transmission mechanism including reduction gearing whereby great power may be developed in the ultimate shaft which forms part of the hoist and which is adapted to carry a cable drum forming a part of a hoist or which may have any suitable operative connection with the truck body or other object to be lifted.

An important object of the invention is the provision of an automatic throw-out mechanism for stopping rotation of the ultimate or driven shaft after it has made a certain predetermined number of revolutions, this feature being of manifest advan tage in preventing injury to the parts, the throw-out mechanism being capable of adjustment so as to operate upon the completion of a variable number of turns.

Another object of the invention is the pro- 5 vision of a power mechanism of this nature which is readily reversible.

The invention further contemplates a general improvement in the construction and arrangement of partsdn devices of this character whereby the efficiency and durability will be increased.

lVith the above and other objects and ad vantages in view, the invention consists in the combination and arrangement of parts to be hereinafter more fully described and claimed and illustrated in the accompanying drawings in which:

Figure 1 is av side elevation of the device.

Figure 2 is a vertical longitudinal section.

Figure 3 is Figure 2.

Figure Figure 3.

Figure 5 is Figure 3.

Throughout the specification and drawings like parts are designated by like reference characters.

Referring to the drawings, the numeral 1 represents a base on which the mechanism is mounted. On the base is secured, by some suitable means, a housing including a bottom section 2, 11 right sides 3, and a shell or cover 4. ()n t e base 1 are standards carrying hearings 6 for the main shaft 7' a section on the line 33 of 4. is asection on the line 4t4 of a section on the line 5-5 of which extends through the housing, which shaft is adapted to carry a hoisting drum or the like, not shown.

Rotatably mounted on the shaft 7 within the housing is a worm-wheel S meshing with a worm 9 carried by a shaft 10 journaled in suitable bearings and extending below and at right angles to the shaft 7. Spaced from and parallel with the shaft 10 is a shaft 11 equipped at one end with a sprocket 12 about which may be trained achain13 driven in any suitable manner from the power take-off of the truck or other power device, not shown. Rotatable on the shaft 11 near one end thereof, is a gear 1 1 meshing with a. gear 15 on the shaft 10. R0- tatable on the shaft 11 near its other end is a gear 16 meshing constantly with an intermediate or idle gear 17 meshing with another gear 18 faston the shaft 10. I

For locking either of the gears 141 or 16 onto the shaft 11 for rotation therewith, and thereby coutrollingthe direction of rotation of the worm 9, I provide a clutch mecha nism including a sleeve 19 splined on the shaft 11 and having opposite clutch faces 20 and 21 selectively engageable with coacting clutch faces 22 and 23 on the hubs of the gears 1 1 and 16, respectively. Pivot-ed on the shaft 7 is a lever 2 1 movable along a slot 25 in the shell or cover 4:. This lever carries a shifting fork 26 engaged within a groove 27 in the sleeve 19. To prevent binding and to permit free movement the lever is shown as having a slot 28 through which passes the shank 29 of the fork 26.

Extending through the upper portion of the housing is a stationary shaft 30 on which are rotatably mounted gears 31carrying pinions 32 here shown as integral therewith,

though it should be understood that they may be secured together. The gears 31 mesh with pinions 33 carried by the worm-wheel 8 located at opposite sides thereof. In actual practice these pinions 33 may be out directly upon the hub of the worm-wheel though this is a mechanical detail of minor importance. Keyed or otherwise secured upon the shaft 7 are gears 34 which mesh with the piuions 32. Obviously, when the worm 9 is driven, the resultant rotation of the worm-wheel will cause the gears 31 to be driven so that the pinions 32 will operate to drive the gears 34:

for: turning the shaft 7. A

For effecting the automatic stopping of the mechanism after the sljiaft l has made a gears 31 so that the predetermined number of revolutions, I provide what may be called a cam plate 35 se cured to or formed on one of the gears 34 and having a spiral groove 36 at the bottomof which are holes 37 within any desired one of which may be engaged a stop 38. The

lever 24 is formed with an elongated slot 39 along which is slidable a pin 40 extending into the spiral groove 36. The lever is arched as indicated at 41 so as to clear the shaft 30. Toavoid escape of oil or grease through the slot 25, the lever is extended through a guard 42 of curved shape which extends beyond this slot in every direction, and which is carried by an arm 43 having 'a hub 44 engaged on the shaft 30.

In the operation, it will be seen that when the lever 24 is in .its intermediate position, the clutch will be in neutral and nothing will rotate except the shaft 11 and the sleeve 19 thereonr For operating the hoist, the

lever is moved in one direction or theother, .depend1ng upon the desired direction of rotation of the shaft 7 whereupon the clutch face or 21 will be engaged with the coacting clutch face 22 or 23, as the case may be. "This will lock either the gear Her 16 for rotation with the shaft. 11 andas these dgears are operatively connected with the 3 shaft of the wornnthe latter will be driven,

imparting rotation to the worm-wheel Sand These pinions' will drive the pinions 32 carried by the latter will drive the gears 34 which, being keyed to the shaft 7, will drive the same. As the shaft 7 turns, the cam plate carried thereby will also turn 'and'the pin carried by the lever will move along the slot 39. TVhen the shaft 7 has made the proper number of revolutions, as determined by the pinions- 33.

position of the stop 38, the stop will strike against the pin 40 and consequently cause the lever to swing into its intermediate or neutral position with the faces on the clutch sleeve 19 out of engagement with the clutch faces 22 and 23. A distinct feature of importance is that the gearsare always in mesh and are therefore not subjected to wear-re sulting from bringing the gearing into mesh. The double gears which I the shafts are represented as suitably hushed though this is a mechanical detail which, like many others, may be varied in accordance with the will of the manufacturer.

Having thus, described my invention, what I claim as new and desire to secure by Letters Patent, is:

1, In a power transmission mechanism,

7. the combination of a driven shaft, a drive shaft, gear connections between the shafts, a clntchmechamsm for making or breakmg the connection between the drive and driven shafts, a lever for controlling the clutch mechanism pivotally mounted with respect to the shafts, a member carried by are rotatable upon the lever and movable thereon, a cam having a spiral groove in its face. the cam bcinfr carried by the driven shaft, and a stop element adjustably mounted on the cam and cooperating with the member carried by the lever.

2. In a power transmission mechanism, the combination of a driven shaft, a drive shaft. reduction gearing between the drive and driven shafts. a clutch mechanism on the drive'shaft for making or breaking the connection between the driveand driven shafts, an operating lever for the clutch mechanism pivoted on the driven shaft, and automatic throw-out mechanism carried by first named stop.

the driven shaft and cooperating with the lever for moving the same to neutral pose 3. In a power transmission mechanism,

the combination 'of a driven shaft, a drive shaft, reduction gearing between the drive and driven shafts, a clutch mechanism on the drive shaft for making or breaking the connection between the drive and driven shafts, an operating lever for the clutch mechanism pivoted on thedriven shaft, and

automatic throw-out mechanism carried by the driven shaft and cooperating with the lever for moving thesame to neutral position when the driven shaft has made a pre determined number of revolutions. 1nclud- .ing a cam plate on the driven shaft formed with a spiral q'roove, a stop disposable at a selected point within the groove, and a coacting member slidable alongthe lever and traveling within said groove.

4. In a power transmission mechanism, the combination of drive and driven shafts, gearing connecting the shafts. a clutch mechanism for coupling and uncoupling the shafts, a pivoted lever for operating the clutch mechanism, and means for moving the lever after the driven shaft has made a predetermined number of revolutions, comprising a cam carried by one shaft and having a spiral groove in its face and provided in the bottom of the groove with a series of holes, astop member engageable within a selected one of the holes, and a coacting stop member movably mounted along the leverand projecting into the groove.

5. In a transmission mechanism includ ing a: clutch havinnr a movable control lever,

stop mechanism for 'the transmission comtary member at a selected point With respect to the center thereof and with respect to a given point in its periphery. and a member movably mounted upon the lever for engagement by said stop element when said rotary member has made a predetermined number of revolutions.

6. In a transm ssion mechanism including a clutch, a control lever therefor and a plurality of rotary members. stop members comprising a member carried by the lever and movable longitudinally thereof, means on one rotary member coacting with the lever carried member for moving the latter longitudinally of the lever in accordance with successive rotations of the rotary memher, a stop element, said stop element upon the rotary member a selected point with respect to its center and means for mounting and a given point in its by said stop element will be engaged by the lever carried member when the latter has been moved by said means to a predetermined extent.

7. In a transmission mechanism including a plurality of rotary members, a clutch and a pivoted clutch control lever stop means comprising a spiral cam groove on one rotary member, a stop element. means for mounting the stop element stationarily at a selected point within the cam groove and a member mounted upon the lever for movement longitudinalh thereof and engaging within the cam groove to be engaged by said stop element.

In testimony whereof I aflix my signature.

ROBERT A. FONTAINE.

circumference where-

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