US1452266A - Centrifugal governor - Google Patents

Description

Apr. 1'7, 1923. A H,F.DOBHN i v QENTRIFUGAL GovRNoR v Filed Deo. 6, 1920 HENRY E. DOBBIN, or NEw YORK, N. Y.,

Patented Apr. "f7, 1923.

ritiri INCORPORATED, OF NEVJ YORK,

ASSIGNORTO WESTERN ELECTRIC COMPANY, N. Y., A CORPORATIONOF `lTZEliV YORK.

` CENTEIEUGAL GOVERNOR.

Application filed December 6, 1920. Serial No. 428,695.

To all whom it may concern.'

Be it known that I. HENRY F. DOBBIN, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful improvements in Centrifugal Governors, of which the following is a full,y clear, concise7 and exact description.

This invention relates to centrifugal speed regulators ory governors and is especially concerned with certain improvements whereby adjustment of the operating speeds thereof is facilitated.

An object in view is to simplify the operation Of adjusting the speed of governors such as are used on impulse senders of the type employed in automatic telephone practice. The Operation of these impulse senders must be regulated quite accurately in order that the impulses shall be propagated neither too fast nor too slow. Adjustments are frequently made by moreor less unskilled workmen and it is accordingly desirable that all complications and necessity for the use of special tools be eliminated.

In accordance with the above object, one feature of the present invention consists in the provision of an adjustable arm attached to the governor fiy-weight to which arm a retractile spring for restraxtning the flyweight is in turn attached. The movement of the adjustable arm in one direction or the other will effect an increase or decrease in the speed of the governor depending upon which way the arm is moved. The ad'ustable arm is preferably arranged to be bent to effect an adjustment, but it may be arranged otherwise to accomplish the same resti-lt as will be pointed out hereinafter.

A further feature is the. provision of an indicator and a calibrated scale therefor for directing the adjuster as to which way the adjustable arm should be moved in order to increase or decrease the speed of the governor as desired. The indicator is preferably in the form of a pointer attached to or integral with the adjustable arm and the calibrated scale is preferably stamped or engraved on the fly-weight.

Referring to the accompanying drawing, Fig. 1 is a view of an impulse sender or what is more frequently termed a calling device. A device of this character is described in det-ail in U. S. Patent No. 1,286,982 to O. F. Forsberg. Fig. 2 is a partial view taken at the rear of the calling device shown in Fig. 1. Fig. 3 is a perspective view of a governor embodying the present invention. Fig. 4: is a perspective view of a modified form of governor also embodying the present invention. Fig. 5 shows a modification of the form shown in Fig. 3. Fig. 6 is a rearview of Fig. 3.

As set forth in the above mentioned Forsberg patent the calling device comprises a rotatable dial provided with a circular row of finger holds. ln Fig. 1, the dial is not shown but the positions of the finger holds are indicated by the dot and dash circles 5. The dial when rotated in a clockwise direction winds up a motor spring. The impulse mechanism remains dormant during the clockwise operation of the dial, but when the latter is released, it returns to its normal position by virtue of the aforementioned.

motor spring during which return movement the impulse mechanism is operated.

As the speed at which the impulses are sent is required to be properly regulated and uniform, the return movement of the dial must be accurately governed. `Upon aclockwise rotationof the dial, gearr 6 is likewise rotated in the same direction. The rotation of gear 6 is transmitted through pinion 7 and gear 8 through'pinion 97 which is also rotated ina clockwise direction. Pinion 9 is'loosely mounted on shaft 10 and is therefore ineffective during the clockwise movement of the dial. Upon the return movement of the dial, however. pinion 9 engages pawl 11 and carries the latter around with it. vllzawl 11 is pivotally mounted on a spider 12 which is secured to shaft 10. The moving parts of the governor are mounted on spider 12; these comprise fly-weights 13 to each of which is attached an adjusting arm 14 between which is connected a retractile spring 15. The arm 14 is substantially parallel to the chords eX- tending between the ends of the arc-shaped weight 13.

ln Fig. 3, the fly-weights are pivoted on pin 16 about which theyrotate under the action of centrifugal force when the governor is rotated. In the arrangement illustrated in Fig. 4, the fly-weights are seated normally on arms 12 which are integral with spider 12.

The adjusting arms 14 are each provided with a pointer 14 and there is a calibrated scale on each fly-weight which co-operates with the pointer. The letters F and S, meaning Fast and Slow77 respectively are inscribed at the extremities of the scale. By bending either of the adjusting arms, the speed at which the governor will run and accordingly the speed at which the impulses are sent out may be varied as described. To increase the speed the adjuster has merely to bend one of the adjusting arms so as to move the pointer toward the designation F. He thus increases the tension of spring thereby more eectively resisting the force tending to throw the ily-weights outwardly when the governor is rotating. A decrease in the speed is accomplished in the reversed manner. An ordinary pair of linemans pliers is the only tool required to make an adjustment.

Each fly-Weight is provided with a friction insert 17, preferably of cork. The governor when assembled in a calling device is mounted' in a stationary casing 18 and during rotation the cork inserts rub against the inner surface of the casing thus retarding the motion of the governor. Any acceleration of the speed of rotation tends to throw the fly-weights further from the center thus increasing the pressure with which the inserts 17 bear against the casing. The resistance to rotation is thus increased and tends to off-set the increased force of rotation and maintain the speed at a substantially constant value.

In the drawing both {iv-weights are provided with adjusting arms 14C, but it is not necessary that both be so provided. If desired only one ily-weight need be provided with an adjusting arm in which case one end of spring 15 would be attached directly to one of the {1y-weights as in Fig. 5 and the other end to the adjusting arm 14 as illustrated in Fig. 3. For practical reasons it is deemed preferable to provide the adjusting arm on both fly-weights.

What is claimed is:

1. A governor comprising a pair of oppositely disposed fly-weights, a pair of adjust- .ing members, one for each fly-weight and each attached to its respective fly-Weight, an .indicator for each adjusting'member, said indicators integral with said adjusting members, a retractile spring connected between said adjusting members and adapted to restrain said iiy-weights against centrifugal motion and acalibrated scale on each iiyweight, for cooperating with the respective indicators.

2. A centrifugal governor comprising an arc-shaped fly-weight, an adjustable member attached to one end of said weight and substantially parallel to a chord extending between the ends thereof, and a rectractile spring attached to said member and adapted to restrain said fly-weight against centrifugal motion.

3. A centrifugal governor comprising an arc-shaped ily-weight, an adjustable member supported on one of said weight and substant-ially parallel to a chord extending between the ends thereof, a second iiyweight, a retractile spring attached to said adjustable member and adapted to restrain both fly-weights against centrifugal motion.

et. A centrifugal governor comprising astationary member having an internal annular surface, a rotatable member in coaxial alignment with said stationary member.` said rotatable member comprising a pair of pivoted fly-weights, a friction stud on each of said fly-weights arranged to frictionallj;y engage said internal annular surface, a pliable arm attached to at least oue of said flyweights, and a retractile spring for restraining said fly-weights against centrifugal force, said retractile spring being attached to said pliable arm, the operating direction of rotation of said rotatable member being such that said friction studs move in advance of the pivotal points of their respective fly-weights.

ln witness whereof, I hereunto subscribe my name this 29th day of November, A. D

HENRY F. DOBBIN.

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