US1339906A - Control apparatus - Google Patents

Description

T. S. PUKERUD.

CONTROL APPARATUS. APPLICATION FILED JUNE 6.1916.

Patented May 11, 1920.

Fig. 2.

INVENTOR Thomas S. Pukerud UNTTE STAE 6:115

THOMAS S. PUKERUD, 01E WILKINSBURG, PENNS'FZ'LVANIA, ASSIGNDR TO W'ES'TING- HOUSE ELECTRIC AND MANUFACTURING" GOMPANY, A CGRPORATION OF PENN- SYLVANIA.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed June 6, 1816. Serial 110. 101,966.

To all whom it may concern:

Be it known that I, THOMAS S. PUKERUD, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and Stateof Pennsylvania, have invented a new and useful Improvement in Control Apparatus, of which the following is a specification.

My invention relates to controllers for governing the operation of electric motors and particularly to that type of controller having a main and a reverser drum.

The object of my invention is to provide a particularly simple and durable mechanical device for controllers of the above-indicated class that shall .effectively accentuate the various positions of the main controller drum and also prevent movement of the auxiliary drum when the main drum is in other than the off position, and shall prevent movement of the main drum when the auxiliary drum is in other than an operative position.

Heretofore, controllers of the above-mentioned type have been provided with a member to accentuate the various positions of the main controller drum and an additional member to interlock the drums, one with the other, in the manner above set forth.

My invention provides a single-piece pawl that effectively interlocks the two control drums and also accentuates the various positions of the main controller drum.

Figure 1 and Fig. 2 of the accompanying drawing are, respectively, a top plan view and a side view, partially in section and partially in elevation, of a controller embodying my invention.

The controller shown in the drawing comprises a casing 1, a plurality of rotatably mounted drums 2 and 8, a notched star wheel 4, a notched cam 5 and an improved pawl 6.

The drum 2 is rigidly mounted upon a shaft 8 which is shown as partially broken away to more clearly illustrate the invention. The star wheel 4: is rigidly secured to the shaft 8 and is provided with a plurality of notches 9, of substantially equal depth, that corresponds to the various operating positions of the controller drum 2 and a notch 10 of greater depth that corresponds to the off position of the controller drum. The auxiliarydrum 3 is adapted to change the motor connections from those for forward direction of operation to reverse direc tion of operation and is rigidly secured to a rotatably mounted shaft 11 to which the cam 5 is also attached. The notch 12 of the cam 5, which corresponds to the neutral position of the reverser drum 8, is of less depth than the adjacent notches 13 which correspond to the forward and reverse positions of the drum 3. The pawl 6 is provided with an off-set lug 1 1 that is adapted to engage'the notched portions of the star wheel 1 and thereby accentuate the positions of the main controller drum 2, a lug 15 which is adapted to engage the notched por tions of the cam 5 and thereby interlock the auxiliary drum with the main drum, as hereinbefore described, and a transverse slot 16 that is positioned intermediate the lugs 14 and 15. The lug 1 1 is preferably provided with a roller 17. A pin 18 is secured to the casing 1 and is adapted to engage the slot 16 and to thereby prevent lon' gitudinal movement and to restrict lateral movement of the pawl 6 in one direction. One end of a spring 19 is secured to the casing 1 by a pin 20 and the other end thereof is attached to the pawl 6 and'biases the same to engagement with the notches of the star wheel 4 and the cam 5.

With the controller drums occupying the relative positions shown in the drawing, an attempt to move the main drum 2 will cause the lug 14 to rise on the adjacent star-wheel tooth until the pin 18 engages the bottom of the slot 16 which, by reason of the shallow slot 12, stops further movement of the lug 14 and thereby prevents the rotation of the drum 2. If, however, the drum 3 he moved to either a forward or a reverse position, the deeper notches 13 will permit of the rise of the lug 1% over the adjacent tooth of the star wheel and thereby allow of the rotation of the drum 2. The spring 19 biases the lug 141 into engagement with each notch 9 and thus effectively accentuates the various positions of the controller drum. The relative shallowness of the notches 9 will not permit of the movement of the cam 5 when the lug 19 is in engagement with other than the notch 10.

From the above description, it will be readily understood that my proposed pawl member will perform the function of effectively accentuating the various controller positions and will also definitely. interlock.

the auxiliary and the main drums simultaneous rotation.

I claim as my invention:

1. In a controller, the combination with a plurality of rotatably mounted contact-bearing drums, a star wheel rigidly secured to one of said drums, and a notched cam secured to another of said drums, oi a single pawl having an intermediate pivo point and having its respective ends engaging said star wheel and said cam to prevent the simultaneous rotation 01": said drums and to accentuate the positions of said drums, and a spring having its respective ends attached to said pawl near said pivotal point and to a stationary part of said controller for biasing the pawl to its engaging position.

2. In a controller, the combination with a plurality of rotatable drums, a notched cam rigidly secured to one of said drums, and a star wheel rigidly secured to another oi? said drums, of a loo ely piwytally mounted position-accentuatingz; one piece pawl having its respective ends engagingsaid notched cam and said star wheel, and a spring for biasing said pawl to engagement with said wheel and cam.

3. In a controller, the combination with a main drum having a star w ieel the not-flies of which correspond to the positions oi the controller, and an auxiliary drum having; a notched cam, of a functionally integral pawl pivotally mounted at a single point and having one end engaging the notches of said star wheel to thereby accentuate the positions of said main drum and the other end engaging said cam, and a tensile spring acting upon the pawl near said point.

4-. In a controller, the combination with a plurality of notched rotatable members, oil a single loosely intermediately mounted. pawl engaging said members t accentuate the positions thereof and to interlock the said members against simultaneous movement, and a spring acting directly upon the mountingpoint.

In a controller, the combination with a plurality of notched rotatable members, oi a position-accentuating pawl having a slot intermediate its ends, a pin extending: through said slot for positioning said pawl and a spring for biasing said pawl to engagement with said rotatable m mbers.

6. In a controller, the combination w a plurality of notched rotatable mend of a pawl tangentially disposed relative to said rotatable members and mounted to have restricted longitudinal movement and lateral movement restricted in one direction, and resilient means for biasinrr said pawl into engagement with said rotatable members.

7. In a controller, the combination with a plurality of notched rotatable memb" of single pawl tangentially disposed w .l respect to each of said members, and a tensile spring attached to a central point of the pawl for resiliently biasing; said pawl to engagement with said notched members.

8. In a controller, the combination with a plurality of notched rotatable members, of a pawl tangentially disposed with respect to each of said members and having a lateral slot and a plurality of projections for en- ;g aging the notches of said rotatable members to thereby accentuate the positions of said mernbers, a pin extend through said slot to pivotally and slidably mount said pawl, and resilient means for biasing said i iember to its operative position.

9. In a controller, the combination with a plurality of notched rotatable members, of a position-ac-rentuatingr pawl tangentially speed with respect to each of said members, 'tudin ,l movement of said pawl and tor restrf 'l means for pre=-renl1in, ,1' long lateral movement tnereot in one dire and resilient means acting upon the pawl near said. first means for biasing); said pawl into engagement 'ith said rotatable members.

10. In a controller, the combination with a main drum having a star-wheel secured thereto, and an auxiliary drum having a notched cam, of single integral positionaccentuating pawl adapted to engage said star-wheel and said. cam and to lock the auxiliary drum in position except when the main drum is in its off position and' a tensile spring acting upon a central point of said. pawl to effect yielding: engagement thereof with said star-wheel and said cam.

11. In a controller, the combination with a drum, a notched wheel secured to said drum and having; a notch of greater depth than the adjacent notches, an auxiliary drum, and a notched cam secured to said auxiliary drum and having; a notch (Pl less depth than the adjacent notches, ot a singlepiece position-accentuating pawl adapted to liechanically interlock said auxiliary drum in position for cert" in positions ot' said main drum and for loc d main drum in ing sci position for a certain position o'l said auxiliary drum.

In controller, the combination with a main drum havinp a star wheel. and an an: liary drum having" a notched cam, of a sin le-picce position-accentusting pawl onv end of? whl =h has an offset lug: adapted to on; e said star wheel, the other end of which has an oll'sct lug adapted to engage said cam and a lateral]y-disposed .lot intermediate said lues pin adapted to engage said slot and position said member, and means for biasing said lugs into engagement with said wheel and said cam.

In testimony whereof, have hereunto subscribed my ame this 31st day of May THOS. S. PUKERUD.

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