US1359464A - Equalizer for variable-tension motors - Google Patents

Description

E. H. PlEBSEN.

EQUALIZER FOR VARIABLE TENSION MOTORS. APPLICATION FILED AUG.2, 1915.

1,359A6Q, Patented Nov. 16, 1920.

2 SHEETS-SHEET 1. 2

' mvmron. Edwin J2. Pzlersen.

rkmx E. H. PIERSEN. EQUALIZER FOR VARIABLE TENSION MOTORS. APPLICATION FILED AUG.2, I915.

1,359,464. Patented Nov. 16, 1920.

2 SHEETS-SHEET 2.

T 34 a5 30 A9 WITNESSES. INVENTOH.

Edwin fzfplkrsen.

PATENT OFFICE.

EDWIN n. rinnsniv, or rornira, KANSAS.

EQUALIZER FOR. VARIABLE-TENSION MOTORS.

Specification of Letters Patent. Patented NQ 16, 1920.

Application filed August 2, 1915. Serial No. 43,118.

To all whom it may concern:

Be it known that I, EDWIN H. PIERSEN, a citizen of the United States, residing at Topeka, in the county of Shawnee and State of Kansas, have invented certain new and useful Improvements in Equalizers for Variable-Tension Motors; and. I do declare the following 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, reference being had to the accompanying drawings, and to the letters and figures of reference markedthereon, which form a part of this specification.

My invention relates to equalizers, and more particularly to a device for equalizing the tension of a spring motor, or the like, the principal object of the invention being to provide mechanism which may be interposed between a spring motor and the point of power consumption to maintain an even pressure 011 the latter irrespective of the speed at which the power is delivered from the former.

In the operation of certain kinds of machinery, it is convenient to use a spring motor, but owing to the excessive tension of the power when the motor is wound to its capacity, it has been found to have disadvantages, owing to the strain imposed on the machine parts. I have found that by using separate springs auxiliary to the motor, and providing means for automatically tensioning these springs from, and check ing the power of the spring motor, a practically constant pressure can be obtained, irrespective of the speed of the motor or the machinery operated therefrom.

In accomplishing the object of the invention, I have provided the improved details of structure hereinafter described and illustrated in the accompanying drawings, wherein Figure I is a plan view of an equalizer constructed in accordance with my invention, showing its relation to a spring motor, power shaft, and governor control.

Fig. 11 is an elevation of the same, parts being broken away for better illustration.

Fig. 111 is a longitudinal sectional view of the e ualizer and spring motor.

Fig. V is a sectional elevation of the equalizer on the line lV-IV, Fig. 111.

Fig. V is a similar view on the line V--V, Fig. III.

Fig. VI is a detail view of theratchet pawl for holding the spring motor against unwinding.

Referring more in detail to the parts 1 designates a frame preferably composed of metal and having bearings 2, in which is 11 that is operatively connected to said' gear wheel through the shaft 12 and pinion 13. I

Fixed to the sleeve 6 by means of a stud 14: is one end of a volute spring 15, the opposite end being connected with a stud 16 in a casing 17 that ishrevolubly mounted on the sleeves 6 and 7 respectively. Separated.

1 from the spring 15 by means of a dividing plate 18 is a second volute spring 19, which is attached to a stud 20 in the casing 17 and .1 to a stud 21 in the sleeve 7 and which is coiled in the opposite direction from the spring 15 so that when the crank 11 is revolved to turn the sleeve 6, the spring 15 will be ten, sioned and carry the casing 17 around to tension the spring 19.

Fixed on an extended portion of the sleeve 7 by means of a set screw 23 is a collar 24, having a laterally extending, peripheral flange 25, and rigidly secured to said flange by means of screws 26 is a ring 27; the ring and collar extending beyond the flange 25 to form an annular groove 28.

Pivotally mounted on a pin 29, that is carried by collar 24 and ring 27, and nested within the groove 28, is a spread-band 30, which is split opposite the mounting, and provided with enlarged heads 31, between which operates a cam 32 in such a manner that when the cam is rocked, the spreadband may be spread so as to grip the inner face of a loose band 33 that rides on the collar 24 and ring 27. v

The band 33 is provided with an inset shoulder 84, which rests loosely in the groove 28 to prevent lateral displacement thereof, and integral with the outer face of the band is a plurality of ratchet teeth 35, which are engaged by a pa'wl36 in the frame 1 that is held yieldinglytoward the teeth by a coil spring 37.

The cam 32 is pivotally mounted in the ring 27 and collar 24 and provided with an arm 39, which projects intoithepath of one of the studs 40 on the gear wheel 41, the said gear wheel being revolubly mounted on the sleeve 7 and adapted to meshwith a gear wheel 42 revol'ubly mounted on the stub shaft 43 on the frame 1.

The gear Wheel 42- meshes with a gear Wheel 44 onthe shaft 45 of a machine or any pointofpower consumption, (not shown) and also carries a gear wheel 47, which meshes with a pinion 48 of av governor 49 that maybe regulatedthrough a speedcontrolling mechanism 50.

Attached to ea; h of the studs 40 is one end of a spring 51, the oppositeends of said springs being secured to pins 52 in the aterally projecting portions 53 ota floating member 54;

Integral with the portions are radially extending arms 55, which lie adjacent the outer face 01"- ring27 and are adapted-for engagement byadjusting screws 56, which are threaded into bosses 5'? on the ring 2 7.

In using the device, assumingthat the motor is niwound, the first step is-to tensionthe springs 1.5 and 19 to produce rotativ'e force. This isaccomplishedby rotating the shaft 3 fronr the crank and gear mechanism provided for that purpose, it beingapparent that asthesleeve i" isfixed to the collar 24, the spring 19 fixed to the sleeve 7 andmotor drum and the spring-15 fixed to the drum and sleeve 6,.when the crank is operatingthe gear wheel 8 will revolve the sleeve 6 and as the collar 24 is held against rotation by the speed controlling lever 50, that contacts with the governor mechanism, the spring 15 will be wound about the sleeve 6 and thespringlt) about the=sleeve 7, the reverse arrangement 01'? the springs causing-the same to be tensioned in opposite directions, one'internally iii-omits sleeve and the other externally i'roni the drum. lVhile themotor is held from the speed controlling member 50, this'holding action is not directly on the motor but through the equalizing device, comprising the floating member 54, having gear connection with the'governor shaft so that it is held against rotation when the governor is locked. As the spring drum is turned in the direction oithe arrows, Fig. II, the adjusting'screws 56"on-the"ring 27 oi thecollar 24 abut against the arms55i on thenfloating member 54 and initia'l'lymove. said member about, tensioningsprings-5'1, this movement oi the floatingniemberand rings27 contii'iuin until -the cam lever 39 engages oneof the sti ids 40 on the gear 41 and rocks the lever.

band 30 and move the hand to contact with the ratchet band 33. As the band 33 is held against rotation in the direction or" the arrows, Fig. 11, by the pawl 36, the sleeve 7 is locked and continued operation oi the crank winds the motor springs until they have been properly tensioned.

lVith the motor tcnsioned, when it is de sired to operate the apparatus for which the motor provides motive power, the speed con trolling mechanism or governor is released through the part 50, to permit the gear wheel 41 to revolve. As soon as the gear wheel is released, the stud 40 moves away from the cam lever 39 under the influenceof'springs 51 and the spreadband is released and moves away from the ratchet ring 33, thereby freeing the collar 24 so that the collar may revolve under tension of the sp 'ing motor and retension springs 51. The motor springs are considerablystifi'er when the motor is wound to the maximum but reduces its proportional tension as the motor runs down, so that the thrust of the adjusting screws 56 on the arms 55 carries the fioatingmember 54 about a ainst the springs 51 and when the springsare tensioned car- .ries the gear wheel 41 about its center, thereby operating the shaft 45 and any driven member that may be connected therewith. As the drivingiorce ofthe motor springs exceeds resistance of springs 51, the ring'Q-Y tension of springs 51 until stud 40 is carried away from the cam lever 39 and the motor again freed to effect a further driven or thrust operation. This action continues as the motor runs down, until the tension of the springs 51 equals that of the motor springs, at which point the cam 32 ceases to act and the springs 51 merely act links between the gear wheel 41 and the floating member 54 and gear wheel 41 is thereby driven as if connected directly to the sleeve 7 of the motor.

When the speed control device ,50 is opened, thegovernor is released and will revolve in proportion to the amount the speed control device is opened; and operate any machine or mechanism driven from, the shaft 45.

43. continues to moveabout this, center under against the arm 39 and turn the ring 0 It will be noted, however, that as the governor is revolved from the gear ll, the gear receives its tension from the springs 51 and not from the spring motor, and that when the spread-band 30 is loosened, the spring motor is permitted to revolve suliiciently to re-tension the springs 51, whereupon the arm 39 again moves against the stud 40 to lock the motor on the ring 33.

As this move-n'ient is seltcontaincei and substantially constant, it is apps rant that irrespective of how fast the motor unwinds or how fast the power is taken oil, the pres sure on the shaft will be constant. It is also apparent that the result will be the same it the governor is not connected in train and the shaft 4:5 coupled to an intermittent movement wherein it is desirable to have a constant even tension maintained at all times.

With some machinery, it is desirable or necessary to reverse the action for a short period, and in order that this feature may be accomplished w thout extra mechanism, 1 have provided the ratchet teeth. 35 on the ring 33 so that ii the shaft a5 and adjacent gearing is reversed, the stud l0 will move backwardly so that the pawl 36 will engage another tooth among the teeth 35 and maintain the same conditions.

It is apparent that during the reverse movement, the equalizer turns as a unit and tends to rewind the spring motor to a greater tension so that nothing is lost and all the revolutions of the motor may be counted as applied to the forward movement of the shaft 45.

Having thus described my invention, what I claim as new therein and desire to secure by Letters-Patent is 1. In combination with a variable driving member, a driven member, and flexible connection between the driving member-and driven member for maintaining constant tension on the driven member irrespective of variations in power of the driving member and comprising means for adjusting the tension of said connection, said connection being under control of the driven member to retard the driving member.

2. In combination with a motor and a driven member, an equalizer comprising a driving member operatively connected with the motor, floating member operatively connected with the driving member, yielding means connecting the floating member with the driven member, a brake for the driving member, and means operable from the driven member for setting the brake.

3. In combination with a spring motor and a gear train, an equalizer comprising a driving member operatively connected with the motor, a fioating member operatively connected with the driving member, a gear meshing with the gear train, springs connecting said gear and floating met her, a brake for said driving member, and a cam operable from said gear ior setting said brake.

in wnnbination with a driven element, transmission operably connected with the driven element comprising a driving member having stops thereon, a brake ring, a motor, a brake band connected with themotor,'a floating memh operably connected with the motor, springs connecting the floating member with said stops to tension the transmission, and band ctuating means movable with the motor and adapted for engaging one of said stops to actuate the brake member and stop the motor.

5. In combination witl a driven element. driving mechanism for the driven element including a wheel having laterally project ing studs, a motor comprising annular rails, a brake on said rails, expansible brake band arranged forlockingengagement with the ring and hi a contact arm for engaging a wheel stud, a floating ring having stop members thereon, springs anchored to the floating ring and to the studs on the transmission wheel, and means on the motor for engaging the ring stops to tension the springs.

6. In combination with a driven element,

actuating mechanism for the driven element comprising a transmission, studs on one of the transmission members, a motor comprisinga drum having spaced rails, a floating ring anchored to the rails, means for holding the ring against travel with the motor, a split brake band mounted on the motor between the rails and having spaced contact heads, a lever having a head pivotally mounted between the brake band heads and having an arm for engaging the wheel stud, a floating member having stop members, springs connecting the floating member with the wheel studs, and adjusting screws fixed to the motor and engaging the stop members to advance the floating ring when the motor is released.

7 In combination with a spring motor, a gear train and a supporting frame, an equalizer comprising a driving member operatively connected with the motor, a ring surrounding said driving member and locked to said supporting frame, a brake band on said driving member, a cam in said driving member adapted to expand said band against said ring, a lever on sr-iid'oam, a gear opertively connected to said gear train, laterally directed studs on said gear, one of which is adapted to engage id cam lever, a floating member having driving engagement with said driving member, springs connecting said gear studs and said floating memher, and means for tensioning said motor to lock said brake.

band on said driving member, means for expanding said brak, band against said brake ring to lock the motor, a gear operatively connected with the gear train and adapted to actuate said GXPHDCHDg'lTIQtLUS, a floating member adopted to be driven it one said driving member, springs connecting said floating member with said gear, and means for releasing said gear train to re lease said'breke and tension said springs.

9. In combination with a spring motor, a gear train and a supporting frame, an equal izer comprising a driving member, lugs on said driving member, adjusting screws in said lugs, a floating member contacting said adjusting screws, :1 gear operetiveiy CS1": nected with the gear train, springs eonneeted with said gear and with said :tieating member, and means operabie from said gear for locking said driving; meniber to said.

frame.

10. In combination with a spring motor, a gear train and e supporting frame, an equalizer comprising a driving member, a

ed vii-tn the gear train, springs connecting id gear and floating member, adjusting screws on the dr'ving member for driving aid floating; member ond tensioning said prings, and means operabie from the gear or lookingsaid driving member to said sup- )orting frame.

.il. in combination with a spring motor,

n ear train and a su moi-tin frame. an i i. in

equaiizer comprising a drivingimember operativeiy connected with'the motor, a brake on the driving member, a ring surrounding the brake andhnving a plurality of external ratrithet teeth rvieidebie 1' twi in said frame for enga 1 said ring teeth, a floatin member operatlveiy connected with said driving member, a gear wheel in said. gear train, springs connecting said floating inemher with said gear wheei for ioeiring said driving member to said ring and holding the motor and whereby the equalizer may be turned baekwardiy as a unit to wind the spring motor.

In testimony whereof 1 21th:: my signature in presence oi two witnesse a EDWIN H. PIERSEN.

' Witnesses:

W. H. Mn'rznonr, F. KENNEDY.

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