US1399445A - Hand-crank - Google Patents

Description

F. A. ROSS.

HAND CRANK.

APPLICATION FILED JULY 27. I920.

1,399,445, Patented Dec. 6, 1921.

F WEN UNITED STATES FRAIIK A. ROSS, F SPOKANE, WASHINGTON.

HAN D-CRANK.

Application filed July 27,

To all from it may concern:

Be it known that I, FRANK A. Ross, a

' citizen of the United States, residing at Spokane, in Spokane county, and State of Washington, have invented certain new and useful Improvements in Hand-Cranks, of which the following is a specification.

The present invention relates to an improved hand crank designed especially for use as a hand lever for revolving rotaryload supporting members and involving a clutch device that is adapted to become disengaged from the cranking device when the speed of the rotated member exceeds that of the crank device, thus providing a safety, apparatus for an. attendant who is actuating the hand crank. I

As a practical application of the principles of my invention I have adapted it especially for use in connection with the unloading or dumping roller at the rear of a lumber truck. Usually the lumber is piled upon a series of spaced rollers, of which the roller at the rear is provided with-pins or friction devices to engage the timber or lumber at the bottom of the supported pile, and the rear roller is revolved, as by my hand crank, to transfer the pile to the rear of truck. As the moving pile passes over the rollers the entire weight of the pile is finally imposed on the rear actuated roller and as the pile tilts downwardly to the rear this actuated roller, vbecause of the increased speed of movement of the falling or dumping pile of lumber, is revolved vwith great speed. Now it will readily be apparent that if a hand crank of ordinary construction is attached or temporarily connected with the 'actuating roller for actuating'the same, the crank will spin with the actuated shaft orroller, endangering the person who has been handling the crank, or the crank maybe thrown by centrifugal force from the shaft or roller, with equal danger to persons standing near.

To eliminate these objectionable features and dangerous conditions I have provided the hand crank with a clutch device that is operable until the rotary movement of the actuated shaft or roller exceeds that of the crank device, and under such conditions the crank device becomes disengaged from the shaft or roller and hangs free of the action of the revolved shaft or roller.

In the accompanying drawings I have illustrated one complete example of the Specification of Letters Patent.

Patented Dec. 6, 19 21.

1920. Serial NO. 399,280.

physical embodiment of my invention adapted foruse as above described, but it will of course be understood that the device of the invention may with equal adaptability be utilized in connection with means for moving a. load, which, after its initial movement increases the speed of its actuating rotary member beyond that of the hand crank.

lVith these and other objects in View the invention consists in certain novel combina tions and arrangements of parts in a reversible hand crank device, whereby the crank may be revolved continuously, or may with equal facility be utilized as an intermittently acting oscillating lever.

Figure 1 is a view in section transversely of the longitudinal axial line of movement of the hand crank.

Fig. 2 is a view also in section taken at right angles to that of the section in Fig. 1.

Fig. 3 is a perspective view of the reversible pawl of the clutch device.

In the preferred form of my invention as illustrated in the drawings Ihave utilized a. conventional form of crank arm 1 and handle 2, the former being of a flat metal plate of the proper dimensions for hand operations. The crank head 3 is a circular, open center member, fashioned with a shank 4 that is recessed to receive the end of the arm. 1, and is rigidly attached thereto by means of the bolts 5, 5, to form a rigid structure. y

Within the hollow open head 3 is located a bushing 6 with both its ends projecting beyond the sides of the head and provided with an angular central opening 7 in this instance shown as square, to fit over the end of a shaft or other device to be revolved by the hand crank. The bushing, Within the head, is provided with two sets of diametrically disposed, peripheral notches 8, and is retained in the head by means of the side plates 9 and 10 that lit against the shoulders 11 formed as an enlargement on the periphery of the bushing in which the notches 8 occur. Preferably an annular groove 6 is fashioned in the periphery of the enlar ed portion of the bushing, as indicated "'n li ig. 2. The bushing is centered in the head and retained therein by he plates 9 and 10 that are rigidly fixed at the sides of the head b means of the bolts or screws 12.

The bushing is free to turn within the head, unless operatively connected theremember co-acting with the head and bushing is a pawl or detent device illustrated clearly in- Fig. 3. Here the pin 13 which is passed transversely through the head and journaled in openings 14 in the'side plates, is provided with a pawl or ratchet member 151 integral therewithand projected therefrom, and thepin is fashioned with a pair of spaced annular grooves 16 and 17. A

detent 18 at the end of the flat spring 19 is adapted to engage either of these two.

grooves, and the spring is secured at 20 in the head of a screw 21 threaded into the shank 4 at one side thereof. The pawl is reversible in its relation to the notched bushing and its pin is laterally shiftable in its bearin s 14, in order that the detent 18 may beflmade to engage the inner groove 16 of-the pinfor a purpose to be'describedr In Fig. 1 it is apparent that the pawl is designed to engage in any one of thenotches 8 of the bushing, in order that by turning the crank handle 1 the rotary movement of the head may be transmitted to the bushing through the medium of the pawl in the notch. As shown in the drawings the crank device is designed to turn a shaft to the right or clock-wise. I Within the head and opening into the cen:

tral opening thereof two recesses 22 and 23 are provided in which the pawl 15 may be retracted, and a pair of centering pins for the pawl as 24 and 24 are projected through the Walls of these recesses to bear against the pawl and hold it in operative position in its notch. A spring 25 is interposed be-,

tween the pin or plunger 2 l'and the screw cap or plug 26 in the'socket 27 in the headshank to hold the centering pin in position against the pawl. I

a In operation, with the squared hole of the bushingon the complementary end of a shaft, and with the pawl engaged in a notch as shown in Fig. 1 by turning the crank arm 1 to the right the bushing is also turned and with it the shaft to which the crank is to natural position below the shaft. "When the speed of revolution of the shaft is sufficiently decreased, the spring pin 24 may again force the pawl into one of the notches of its revolutions.

herein is- V 1 1. The combination wlth a crank arm, and

8, but such action will not take place until the bushing has reached practically the end If it is desired to use the crank for turning a shaft to the left or anti-clockwise, the

detent 18 is first disengaged from the annular groove 17 and then the pin 13 is slid through itsbearing plates, to the left in ,Fig. 2 until the pm protrudes sufficiently to permit the spr ng detent to engage the roove 16, and in this positiom-t'he pawl has been shifted over in front of the recess 23 in the head, but still in position to enlata-ble lever Thusrby turning the crank handle through an arc of say 45, it may then be swung backward on an idle stroke with the pawl disengaged from a notch, and

thenthe working stroke in the proper direction will again cause the engagement of the pawl'with a notch in the bushing, rendering the device applicable as an intermittent, oscillatable', crank or lever. While I have referred to the shaft to be turned as a roller shaft, it will be readily understood that the bushingmay be applied as a socket member to numerous other elements similar to a shaft and for various purposes other than the one exemplified herein. y 3

Having thus fully described my invention, what I claim as new and desire-to cover head having a circular opening at itscenter and amexternally notched socket-bushing in: said head, saidhead having an exterio'r enlargement and side plates engaging said enlargement to retain the bushing, of a shiftjable pawl pivoted in said head to engage thenotched bushing and lock the head an bushing for movement in a selected direction, and said head havingoppositely disposed recesses to receive said pawl.

2. The combinationwlth a crank arm, and

head having a rotatable, notched, socketbushing therein, of a shiftable pawldevice pivoted in said head, and said head having oppositely disposed recesses adapted to receive said pawl, for the purpose described.

3. The combination with an open head and a socket bushing therein having an intermediate, exterior enlargement and notches as described, of side plates engaging said enlargement, a pin supported in said plates and having an integral pawl thereon to engage a selected notch, a recess in the head to receive said pawl in retracted position, and a spring pressed plunger in the head to engage said pawl for the purpose described.

4. The combination with a crank head, notched socket-bushing and retaining means therefor, of a pin having an annular groove and a spring detent engaged in said groove, a pawl integral with the pin and adapted to swing therewith, and said head having a recess to receive the pawl when in retracted position, for the purpose described.

5. The combination with a crank arm and head, a socket-bushin in the head having an intermediate exterlor enlargement, side plates for retaining said bushing, and said bushing having spaced notches as described, of a pin journaled in said plates and provided with a pair of spaced annular grooves, means for engaging either of said grooves to hold the pin, in laterally shifted position, a pawl on the pin to engage a selected notch, and said head fashioned with oppositely disposed recesses to receive the pawl in retracted position, for the purpose described.

In testimony whereof I afiix my si ature.

FRANK A. OSS.

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