US744986A - Governor for dynamos. - Google Patents

Description

No. 744,986; PATENTED NOV. 24, 1903. T. S. TAGUB. GOVERNOR FOR DYNAMOS.

APPLIGATION FILED DEC. 18, 1902. K0 MODEL.

2 SHEETSf-SHEET 1.

I I" v Alfonse w No. 744,986. PATENTED NOV. 24, 1903. T. s. TAGUE.

GOVERNOR FOR DYNAMOS.

APPLIOATION FILED DBO.1B, 1902.

.H0 MODEL. 2 SHEETS-SHEET 2.

WUNESSES' fNVE/VTOR I Q i @Tayzze;

Alforneyw 15. ulQLg UNITED STATES .Fatented November 24, 1903.

PATENT @rmcn.

GOVERNOR FOR DYNAMOS.

%PEGIFIOATION forming part of Letters Patent N 0. 744,98 6, dated November 24, 1903.

Application filed December 18,1902. Serial No. 185,828. (No model.)

To LtZZ whom, it may colwern:

Be it known that I, TRACY S. TAGUE, a citizen of the United States, residing at Pendleton, in the county of Madison, State of Indiana, have invented certain new and useful Improvements in Governors for Dynamos; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to dynamos in general, and more particularly to the class of ignition, dynamossuch as are employed in connection with explosive-engines, and it has specific reference to the governor mechanism by means of which excessive speed of the dynamo is prevented.

The object of the invention is to provide a cheap and simple form of governor mechanism which will be efficient in its operation and in which the armature-shaft will be thrown into and out of operative relation to the engine with which the dynamo is employed, a further object of the invention being to provide a construction which may be adjusted to limit the dynamo to different maximum speeds.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is an elevation showing a dynamo provided with a governor mechanism embodying the present invention. Fig. 2 is avertical section through the governor mechanism and the dynamo. Fig. 3 is a transverse section taken vertically through the armature-shaft and including the shiftable disk of the governor. Fig. 4 is a side elevation showing a dynamo equipped with a modified form of the governor mechanism. Fig. 5 is a vertical section corresponding to Fig. 2 and showing the modified governor mechanism.

Referring now to the drawings, there is shown a dynamoincluding the field-coils 5, mounted upon the base 6, having the lateral extension 7, on which is mounted the yoke-- shaped post 8, the lower end of this post being slidably engaged in a longitudinal groove 9 of the extension 7, so that said post may be shifted toward and away from the fieldcoils 5. To shift the post 8 and hold it at different points of its adjustment, a set-screw 10 is provided and is passed loosely through the post and engaged with a threaded perforation in the lug 11, which projects upwardly from the extension 7. To facilitate rotation of the screw 10, it is provided with a milled head 12, and upon the screw at opposite sides of the post 8 are collars l3 and 14, which prevent longitudinal movement of the screw through the post and insure adjustment of the post in the slot 9 of the extension 7 when the set-screw is rotated. The utility of this adjustment of the post 8 will be understood from the further description of the structure.

The dynamo has the usual armature 15, provided with the shaft 16, on which is splined the sleeve 17 for sliding movement thereon, and at the outer end of the sleeve is the small friction-wheel 18, having a beveled engaging face 19 for contact with the bevel 20 of the friction-wheel 21, which is rotatably mounted in the yoke of the post 8, so that if the wheel 21 be rotated and the small friction-wheel 18 be in contact therewith thearmature-shaft 16 will be rotated to operate the dynamo, and if the sleeve 17 be moved longitudinally to disengage the friction wheels the dynamo will continue to run at a decreasing velocity due only to its momentum, and if the disengagement be,continued the shaft will finally stop.

To automatically shift the frictionwheel 18 into and out of engagementwith the bevel 20 of the wheel 21, a disk 22 is slipped onto the sleeve 17, and through it are engaged screws '23, which impinge against the shaft 16 after passing through the longitudinal slots 24 in the sleeve 17, the disk 22 being thus held securely to the shaft 16 to rotate therewith, while it does not prevent limited longitudinal movement of the sleeve 17. The sleeve 17 is held normally and yieldably with the friction-wheels in mutual engagement by means of the helical spring 25, which is disposed upon the sleeve and bears with its ends against the wheel 18 and disk 22.

To retract the sleeve 17 and its frictionpnlley when the speed of rotation of the armature-shaft has reached a predetermined point, governorballs 26 are provided at the ends of angular levers 27, which are pivoted at their angles to the radial extension 28 of the disk 22, the opposite ends of the angular levers resting against the collar 28 at the inner end of the sleeve 17. Thus as the speed of rotation of the armature-shaft increases, the centrifugal force will cause balls 26 to move outwardly and swing the angular levers 27 to slide the sleeve 17 in a direction to move the wheel 18 from the wheel 21, and in consequence the speed of rotation of the shaft and its armature will gradually decrease until the centrifugal force is reduced to that point where the helical spring is permitted to rengage the friction-wheels. By manipulating the screw 10, as above described, the post 8 may be shifted to carry the wheel 21 in the direction of the field-coils 5, so that the wheel 18 must be retracted farther to dis engage it from Wheel 31, thus requiring a greater centrifugal force and a higher speed of the armature-shaft, so that the dynamo will be operated at a higher speed before the governor mechanism will effect disengagement of the friction-wheels. Thus by shifting the post 8 the mechanism may be set to operate at different speeds.

Referring now to Figs. 4: and 5, in this form of the invention the armature-shaft 30 has a sleeve 31 splined thereon, and which sleeve at one end has the beveled friction-wheel 32 and at the opposite end the collar 33, against which impinge the ends of angular levers 34, having ballast-balls 35 at their opposite ends, the levers being connected at intermediate points to the radiating arms 36 of a disk 37, which is fixed upon the armature-shaft 30. Encircling the shaft 30 between the collar 33 and disk 37 is a helical spring 38, which bears with its ends against the collar and disk, respectively, and holds the wheel 32 normally and yieldably in contact with the frictionwheel 39, from which the armature-shaft is driven. Fixed to the dynamo is an arm L0, at the upper end of which is a longitudinallyadjustable spindle 41, which carries the wheel 39, and which spindle when adjusted longitudinally moves the wheel 39 toward and away from the disk 37. With this construction it will be seen that centrifugal action will cause the balls to swing outwardly when the proper speed has been reached and move the sleeve to disengage the friction-wheels against the pressure of the spring 38 and that the adjustable spindle provides for setting the mechanism to operate at the proper speed.

In practice other modifications of the in vention may be made, and any suitable materials and proportions may be used for the various parts without departing from the spirit of the invention.

What is claimed is- 1. The combination with a driven shaft, of a sleeve splined thereon and having longitudinal slots, a disk disposed loosely upon the sleeve and having attaching means passed through the slots of the sleeve and engaging the driven shaft,a wheel carried by the sleeve, a helical spring disposed upon the sleeve and bearing with its ends against the disk and wheel, a collar upon the sleeve at the opposite side of the disk, weights having levers mounted upon the disk and resting against the collar for shifting the sleeve, and a driving-wheel disposed with its axis parallel to the axis of the shaft forengagement by the driven wheel when the latter is moved in opposition to the centrifugal action of the weights.

2. The combination with a driven shaft, of a sleeve splined thereon and having longitudinal slot-s, a disk disposed loosely upon the sleeve and having attaching means passed through the slots of the sleeve and engaging the driven shaft,a wheel carried by the sleeve, a helical spring disposed upon the sleeve and hearing with its ends against the disk and wheel, a collar upon the sleeve at the opposite side of the disk, weights having levers mounted upon the disk and resting against the collar for shifting the sleeve, a post, a driving-wheel mounted upon the post with its axis parallel to that of the driven shaft, said wheel being in the path of movement of the first-named wheel by the action of the helical spring, and means for shifting the post toward and away from the first-named wheel.

3. The combination with a driven shaft, of a sleeve slidably mounted and held against rotation thereon and provided with a wheel, a stop fixed upon the shaft, a helical spring disposed between the stop and aportion of the sleeve to hold the sleeve yieldably against longitudinal movement in one direction, a collar upon the sleeve, weights having levers pivoted to the stop and slidably engaging the face of the collar for shifting the sleeve, and a drivingwheel disposed with its axis parallel to the axis of the shaft for engagement by the first-named-wheel when the latter is moved in opposition to the weights.

In testimony whereof I affix my signature in presence of two witnesses.

TRACY S. TAGUE. \Vitnesses:

GEORGE T. KNIGHT, J r., CORNELIUS B. KUsLINe.

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