US1330790A - Driving mechanism for valves and other devices - Google Patents

Description

PETER 1. DEAN, oE NEW YORK, N. Y.

-DRIVINMECHANISM FOR VALVES ATTI) OTHER DEVICES.

Specification of Letters Patent.` Patented Feb, 17, 1920.

Application led October 1, 1917. Serial No. 194.212.

To all whoa?J t may concern Be it known that I, PETER P. DEAN, a subject of the King of England, residingat New York, in the 'county of Bronx and State of New York, have invented new and useful Improvements in Driving Mechanisms for Valves and other Devices, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relatesto driving mechanisms for valves and other devices.

In my prior Patent No. 1,245,574, issued Nov. 6,1917, there is disclosed a driving mechanism including a normally restrained member releasable toeect substantially instantaneous release of the driven member from the driving member, together with alternative mechanical and electrical control means for said normally restrained member, and said1 electrical control means forms in part the subject matter of this application.

Also, this application discloses a modification of such electrical control means together with a modification of the driving mechanism. In the accompanying drawing,

Figure 1 shows schematically the aforesaid driving mechanism and shows diagrammatically one of the forms of electrical control means shown in said copending application;

Fig/ 2 shows diagrammatically anothery form o'f electrical control means shown in said prior patent; and,

Fig. 3 shows diagrammatically and schematically the aforesaid modifications.

Referring, to Fig. 1, the same schematically illustrates a driven shaft 1, a driving motor 2 and planetary speed reducing gear 3 for connecting the same. The planetary gear includes a pinion 3a driven by the motor 2, as by a shaft 4, a plurality of pinions 3b carried by a member 5 i'iXed to the driven y shaft and an internally toothed ring 3. The pinions 3b are arranged between and in mesh with the pinion 3a and toothed ring 3 and said ring is revolu'ble and forms the aforesaid restrainabley and releasable member. Thus as will be apparent, restraint of the ring will render the planetary gear effective as a driving connection between the motor 2 and shaft 1 and for so restraining the ring there is provided a pawl 6` adapted to be projected into a peripheral groove 7 in said ring and into the path, `of a block 8 fixed in said groove. release of the ring by the pawl will allow rotary play thereof for release of the driven shaft from the driving motor. The pawl has two extremities 6a and 6b to coperate with the block 8 of the ring and the arrangement is such that whenever f the pawl is rocked from either extreme position to the other it will Withdraw one extremity from the path of said block and project the other extremity thereof into the path of said block. Thus the pawl when so operated. provides for release of the ring and relooking thereof b ut sub-ject to a given rotary play of said ring in reverse directions.

Considering now the control means shown in Fig. 1, the same includes solenoids 10 and 11 for shifting the pawl 6 from one extreme position to the other selectively, limit switches 12 and 13 `for terminating the power supply to the motor and controlling said solenoids and a master switch 14 for starting said motor in opposite directions selectively. The limit switches 12 and 13 are operable by a traveling member l5 mounted upon a` screw threaded' shaft 16 which is driven from the shaft 1 through a pinion 17 and gear 18; The limit switch 12 has two electrically independent sets of contacts 12a and 12b, the former controlling the continuity of the motorr circuit and 'both coperating to control the continuity of circuit of solenoid 10, the arrangement'being such thaththe latter contacts engage prior to disengagement ofthe former contacts. The limit switch 13 has vsimilar sets of contacts 13a and 13",

the former controlling the oontinunity of the motor circuit and both coperatin control the circuit of solenoid 11. hus wheneither limit switch isfoperatedit will On the other hand,

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energize one. of the^ so-lenoids to shift the pawl and thereupon simultaneously interruptthe motor circuit and denergize such solenoid. And the relation of parts is such that the pawlhas given positions for re- -verse operations of the driven memberwhereby Whenever the sameis shifted as describedin response to the limit switches,it will' release the ring'fonrotation in a direction corresponding to the direction of `concurrent operation of the motor. `This motor to line L.

will effect instantaneous release of the driven member, which will be immediately followed by interruption or" the motor circuit and assuming suflicient inertiar of the motor to r0- tate the ring until the latter is 'rearrested a hammer-like blow will be imparted to the driven mechanism. Then if the motor be started in a reverse direction it will rotate the ring in a reverse direction for substantially one revolution until the block 8 engages the opposite side of the projected pawl extremity whereupon the driving connection will be restablished and the driven mechanism will be started in a reverse direction and with a hammer-like blow. Also, reversal of the driven shaft will reverse the drive of the traveling device'l for resetting of the tripped limit switch.

Describing the circuit arrangement illustrated in Fig. 1, positioning of the master switch 14 as shown completes circuit from line L to contact 14c through segment 14g to contact 14d, by conductor 20 through the motor armature A, by conductor 21 to contact 14h, through segment 14t to contact 14a, 'by conductor 22 through contacts 13a of limit switch 13, by conductors 23 and 24through the series field winding F of the motor, by conductor 25 to linev L. Such connections, it may be assumed, effect operation of the motor tending to rotate the ring 3c in a counter-clockwise direction for operation of the driven shaft in a direction to move thetraveling device 15 to the right for actuation of limit switch 13. Actuation of limit switch 13 opens the motor circuit, but prior thereto completes the circuit of solenoid 11.' This circuit may be traced from line L by conductor 216 through winding 11, by conductor 27 through contacts 13b of switch 13, b-y conductors 28 and 22 through contacts 13a, by conductors 2,3 and 24 through the series field winding of the Accordingly the pawl will be shifted to the right to free the ring with the results 'albove described, and the circuit of solenoid 11 will be interrupted upon disengagement of contacts 13a for interruption of the motor circuit. With the master switch in its other position the motor circuit may be traced from line L to contact A reverse operation of the motor and consequent reverse operation of the shaft 1. Such operation of the shaft 1 moves the device l5 to the left for actuation of limit switch 12 and said limit switch when op` erated interrupts the motor circuit at contacts 12e. Previously to so doing said limit switch completes circuit from line L by conductor 26 through solenoid 10, by conductor 31 through contact 12b, by conductors 32 and 30 through conta-cts 12a, by conductors 23 and 24 through the series field winding to line L as already traced. This provides for shifting the pawl 6 back to the position shown, with the result of again releasing the ring for arrest of the driven shaft.

ln the arrangement shown in Fig. 2, a reciprocating plug 35 is substituted for the pawl 6 and said plug is provided with a spring 3G normally projecting the same into the groove in the ring 3c and with an' electromagnetic winding 37 for withdrawing the same :from said groove. The limit switch mechanism is identical with that shown in Fig. 1 but in this instance theA limit switch controls parallel circuits for said winding 37 and operation of either limitswitch serves to energize said Winding prior to interruption of the motor circuit and to denergize said winding upon interruption of the motor circuit. In consequence the retraction of the plug will be only momentary to permit the bloclr 8 of the ring to pass beneath the same, the plug being thereupon again projected into the groove for effecting the same control of the driving connection as that effected by the pawl 6. Also, in this instance the master controller is provided with additional contacts 14J and 14k for coperation with the limit switches to control the parallel circuits. With the master switch in the position shown, tripping of limit switch 13 completes the circuit of winding 37 from conductor L by conductor 38, through said winding, by conductor 39 through contacts 13b of said limit switch, by conductor 40 to contact 14j, through segment 14f to contact 14a, by conductor 41 through contacts 13a of said limit switch, by conductor 42 throu h the series field `winding to line L. On t e other hand, with the master switch in its 'other position, tripping of' limit switch 12 completes the circuit of winding 37 from line L by conductor 38 through said winding, by conductor 43 through contact 12b of limit switch 12, by conductor 44 to contact 14k through segment 14i to contact 14e, by conductor 45 through contacts 12a of said `limit switch to conductor 42 and thence to is provided a reci rocating plug 50 having at its end teeth to engage teeth 52 provided on the periphery of ring 3 in lieu of the groove and block above described. 5 The teeth of the ring and plug are adapted when engaged to lock the ring against rota'- tion in either ,direction and hence the plug provides for locking the ring in any angular position thereof for immediate establishment of a driving connection without the necessity of taking up any play of the ring. Also, in this instance, the plug is provided with a spring 53 for retraction thereof to release the ring and with an electromagnetic winding 541to project the same into engagement with the ring. The winding 54 is adapted Jfor series connection with ,the motor and .is controllable by the contacts 12 .and 132l of the limit switches which in this instance require no additional contacts. The arrangement is such that when the motor circuit is completed through either limit switch the winding 54 will'be energized to project the plu 50 into locking position for immediate esta' lishrnent of a driving connection between the motor and driven' shaft whereas tripping of the active limit switch will simultaneously interrupt the motor circuit and denergize the winding 54 for release of the plug and consequent immediate interruption o the driving connection. Also the arrangement is such that the winding 54 is placed under the control of the master switch 14 whereby the mechanical drive may be at any time interrupted by positioning the master switch to interrupt the motor circuit. And as will be apparent, such control of the driving connection enables the driven mechanism to be inched or otherwise intermittently operated at will.

The circuit arrangement shown in Fig. 3 is such that with the master switch positioned as illustrated circuit may be traced from line L, by conductor 55 to and through contacts 14, 14g, and 14d, by conductor 56 through the motor armature from right to left, by conductor 57 to` and through contacts 14", 14 and 14a, by conductor 58' through contacts 13il of limit switch 13, 50 by conductor 59 through winding 54, `by

conductor 60 through the series field winding of the motor to line L. On the other hand, with the master switch in its other circuit closing position circuit may be tracedl 5. from line L by conductor 55 to and through contacts 14, 14v and 14", by conductor 57 to and through contacts 14d, 14"*and 14e, by

conductor 61 to and through contacts12L of limit switch 12, .by conductor 59 -through .3 winding 54 and thencethroughl the series field of the motor'to line L. Thus movement of the master switch to an intermediate position provides for interruption of all of said circuits to denergize winding 54 and S5 terminate the power supply to the motor.

What I `claim as new 'anddesire to secure by Letters Patent is:

1. In combination, a reversible driving element, an element to be driven thereby in opposite directions, a driving connection be 70 tween said elements including a member to be respectively restrained and released to render said connection eective and ineffective, an electromagneticy restraining device for said member and means operable by one of said elements upon operation thereof in either direction to a given limit to control said restraining device.

2. In combination,l a reversible driving element, an element to be driven thereby in opposite directions, a driving connection between said elements including a member to be respectively restrained and released to render said connection effective and inefective, an electromagnetic restraining device 85 for said member and circuit controlling means for said device operable )by one of said elements after operation thereof in either direction to a given limit to eiiect releasing operation of said device, said controlling means providing for, disconnec-v tion of said device from circuit during sub? sequent idleness of said connection.

l 3. In combination, driving and driven elements, a driving connection therebetween including a member to be respectively restrained and released toi render said connection effective and ineffective, and electromagnetic restraining means or said member controlled by one of said elements for eiecting release of said member at given limits and` for thereafter restraining said member for effectiveness of said connection upon reverse operation of said driving element. i 4. In combination, v a reversible driving element, an element to be driven thereby in opposite directions, a driving connection between said elements including 'a member to be restrained to renderA said connection ef- 110 fective and to be released to render said connection ineffective, a device movable to different positions to restrain and release said member selectively, said device being biased tol oneof said positions and electromagnetic means controlled by one of said elements upon operation thereof in either direction to a given limit to move said device to another of said positions.

.5. In combination, driving and driven 120 elements, a -driving connection therebetween including amember to be restrained to render said connection effective and to be rei leased to renden said connection ineffective, a

device movableto one position for restraint of said member and to another position' for release of said member, said device being biased to one of'said positions, electromagnetic means for moving said device to the other of saidpositions and means operated by oneA operate the saine in opposite directions, av

driving connection between said element and said means including a member requiring restraint to render said connection effective,

an electromagnetically controlled restraining device for said member and means operated by said element after operation thereof in either direction to agiven limit to control the power supply to said driving means and to control said restraining device.

7. In combination, an element to be driven, reversible power driving means therefor to operate the same in opposite directions, a driving connection between said element and said means Aincluding a member t0 be restrained to render said connection eiective and to be released to render said connection ineffective, an electromagneti'cally controlled restraining device for said mem'ber and means operated by said element to control both said 'driving means and said restraining device to e'ect release f said member and termination of the power supplied to said driving means upon operation of said element in either direction to a given limit.

8. In combination, an element to be driven, reversible power driving means therefor, a driving connection therebetween including a member to be restrained to render said connection effective and released to render said connection ineffective, limit means for said driving means operable by said element and an electromagnetic restraining device for said member also controlled by said limit means to provide for release of said member at given limits and for subsequent restraint of said member upon reversal of said driving means.

In witness whereof, I have hereunto subscribed my name.'

. PETER P, DEAN.

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