US1136366A

US1136366A - Dynamometer.

Info

Publication number: US1136366A
Application number: US660549A
Authority: US
Inventors: John A Randall
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-12-08
Filing date: 1911-11-16
Publication date: 1915-04-20
Anticipated expiration: 1932-04-20

Description

l. A. RANDALL.

DYNAMOMETER.

APPLICATION FILED Nov.16, |911.

LSI@ Patented A101220, 1915.

3 SHEETS-SHEET 1.

[NI/ENTOR J. A. RANDALL.

DYNAMOMETEH.

APPLICATION FILED 11011.16. 1911.

Patented p.. 20, 1915.

3 SHEETS-SHEET 2.

1. A. RANDALL.

DYNANIOMETER.

APPLICATxoN FILED Nov. 1s, 1911.

Patented M1120, 1915,

3 SHEETS-SHEET 3* Q/Mfbm/Q JIUHN A, NDALIL, F BROOKLYN, NEW YRK.

JDYNOMETER. l

Maaate.

Speciication of Letters Patent.

)Patented Apr., 26, 1915.

original appication iled December 8, 1910, Serial No. 596,183. Divided and this application filed November To all whom it may concern Be it known that ll, JOHN A. RANDALL, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Dynamometers, of which the following is a specification.

This invention relates to dynamometers and its novelty consists in the construction and adaptation of the parts, as will be more specifically hereinafter pointed out.

lfn brief, the invention consists of an improvement in indicating transmission dynamometers whereby a clutch is adapted to couple the driving with a driven member, a dynamometer automatically measures the amount of power transmitted between them and records it, and when an overload is reached the clutch is automatically released.

lin a prior application tiled by me December 8, 1910, Serial No. 596,183, of which this the present application is a division, I have claimed the matter described in the present application pertaining to a recording dynamometer and in an application No. 660,478, filed Nov. 15, 1911, I have claimed the matter described herein pertaining to an indicating dynamometer.

1n the drawings, Figure 1 represents va Side elevation of a mechanism embodying a preferred form of my invention; Fig. 2 is a central section through the saine and a front elevation of some of the parts, showing the clutch in an engaging position; Fig. 3 is a view similar to that shown in Fig. 2, but showing the clutch in a disengaging position and also showing the wiring in diagrammatical outline; Fig. 4 is a reduced side elevation of the dial plate; Fig. 5 is a perspective of the driven shaft annulus; Fig. 6 is a side elevation of the driving disk, parts being cut away to show concealed parts;

v Fig. 7 is a'perspective of the releaser frame;

Fig. 8 is a perspective of the releaser and shifter, and Fig. 9 is a representation of a tool for operating the shifter.

1n the drawings, 10 is a driving shaft actuated from a suitable prime mover indicated at 11. Fixed to it and revolving with it is a clutching plate 12, having a hub 13 provided with a key way 14 into which is inserted a key 15 whereby it is secured to the shaft 10, and also having a series of inserts 16 of cork or other suitable clutching mate- Iial. Loosely mounted on the shaft 10 is a Serial No. 660,549.

second clutch plate 20 having a peripheral flange 21, provided at several points with lugs 22 for a purpose which will presently appear, and provided also with an inwaidlv projecting annular hub or enlargement 23. A driven shaft 30 is mounted to rotate in close prontimity to the driving shaft 10 from which it 1s separated by a small but appreciable space 17. Upon the outer end of this shaft 30 and adjacent to the inner end of the driving shaft 10 is a cylindrical hub 3l provided with a key way indicated at 32 bv which it 1s rigidly secured to the shaft 3i) by a su1table key (not shown). This hub is provided with an outwardly projecting annular flange 33 adapted partially to embrace the hub 23 of the clutch plate 20. It is provided with an inwardly projecting tooth 34 having angularly disposed

sides

35, 35. A coiled spring 36 is secured at one end to the annular flange 21 of the clutch plate 20 by a screw 37 or similar means and at the other end to the hub 31 by a screw 38 or similar means. 1

Mounted loosely upon the shaft 30 is a cylindrical shifting and releasing device 40 provided with two annular grooves, one 41 adapted to receive a forked tool (see Fig. 8) whereby it may be moved longitudinally along the shaft 30 and the other adapted to receive a framework indicated at 42 (see also Fig; 7). It is also provided with a projecting tooth 44 having angularly disposed

sides

45, 45, arranged to contact with or eligage the tooth 34 on the hub 31. Also se- -cured to the shaft 30 by a strap 46 or other suitable means is a conducting pointer 47. A pulley 48 and belt 49 represent a connection between the driven shaft 30 and any machines which it may be intended to actuate.

1n front of the clutch plate 12 is arranged an annular disk or fiat shoe 50, provided with projecting pins 51, engaging apertures formed to receive them in the lugs 22 and with an interposed coiled spring 52 around each pin whereby the disk 50 is normally kept out of contact with the clutch plate 12.

Between the frame 42 and the disk 50 is a link and lever mechanism indicated at 54' and made up of a series of sets of links and levers (see Fig. 1) whereby when the shifter 40 is moved toward the right (in Fig.. 2) the clutching plate 12 is pressed against the clutched plate 20 and the cork inserts 16 are lows z-Supposing that the parts are in the,

brought into contact with the outer surface of the plate 20 and consequently the rotary motionl of the shaftlO'is' imparted throng this frictional contact to the plate 20.

Secured to the link and lever mechanism 54 at a suitable. oint is an.l electrical conductor 55 removably and adjustably mounted in a bracket 56 and held in place by a set screw 57. Secured by a bracket 58 to the ceiling orV any other convenient lace adjacent to the mechanism is a simi ar conducltor 59 suitably insulated from the ceiling. A bracket 6 0 also secured to the ceiling or other .convenient support and insulated therefrom carries. a dial plate 61 suitably graduated at its edge 62 in terms of any appropriate notation. The center of the dial is coincident with the center of the

shafts

10 and 30 and in the form illustrated the shaft 30 passes through the dial.

Proper electrical connections are shown in diagram in Fig. 3 in which 8O is the battery, 81 is the primary coil, 82 is the vibrator or interrupter of the primary circuit, 83 is the secondary coil and 84 and 85 are the secondary circuits.

The framework 42 comprises annular members 420 terminating in lugs 421 to which the link and lever mechanism is secured. The members 420 encircle the cylindrical body of the shifter 40 and engage the sides of the groove in which they are placed. The frame 42 may be placed at any position with respect to the shifter 40 and the latter may be adjusted so lthat its tooth 44 may have any position circularly with respect to the tooth 34 on the hub 31. A forked tool having prongs 71 is adaptedto engage the groove 41 whereby the-shifter may be manually moved on the shaft 30.

The mode of using the deviceis as folosition shown in Fig. 3 and the shifter 40 y means of the tool 70 is moved to the right until it occupies the position shown in Fig. 2,-the frame 42' will -be moved tothe right and through the link and lever` mechanism 54 the plateor shoe 50 willl be pressed inwardly against the clutching plate 12 and the inserts 16 .of the latter will frictionally engage the clutch plate 20 and the latter will turn under the motion derived from the shaft 10. As soon as the plate 20 begins to annular hub 31'and through it to the driventurn it winds up the spring 36 until the resistance of the shaft 30 is overcome and motion is'imparted through the spring to the 'shaft 30 to which' it is secured. It is obvious that the angle'through which the plate 31 is a function of the power transmitted between the two` shafts if the speed of the driven shaft is known. Since the plate 20 is'rigidlyconnected to the framework 42 through the link and lever mechanism, the

.f tooth 44 always has,

when rotating, a fixed phase angle relatively to any point on the plate 20 and therefore its motion is the (same as that of late 20. Since the tooth 34 is fixed to the hu 31, the motion of the tooth 34 is the same as that of the hub 31. The,

change of the phase angle of the tooth 34 relative to the tooth 44 is a measure of the torque or power transmitted to the shaft 30 if the speed of the shaft is known. Now the relative phase angle of the tooth 34 and the tooth 44 is indicated and recorded by the electrical attachment described up to the special occasion when this angle between the teeth becomes zero which will be hereinafter considered.

As the tooth 34, the link and lever mechanism 54 and the conducting pointer 55 have a fixed angular phase relation, and as the tooth 44, the hub 31, the shaft 30, the strap 46 and the pointer 47 also have a fixed angular phase relation, the change in phase relation of the tooth 34 and the tooth 44 will be the same as the change in phase relation When, however, the driving shaft is transmitting power to the driven shaft, the spark will jump from the conductor 59 to the conductor 55 when they are opposite, but since the pointer 47 will now be in a 'different phase relation to the conductor 55, the spark will jump to a different graduation on the dial 6l and not to the zero graduation, and the observed numerical value of this graduation will be a measure of the torque and consequently of the power transmitted. A permanent record of the torque, andA consequently of the power at a given fixed speed, is formed by the abrasion of the graduated disk, or suitable material placed on the face of the disk, caused by the spark.

In case the torque increases to an amount which will reduce the phase angle between the surfaces of the tooth 34 and`44 to zero and is tending to further increase, then the tooth 44 will contact with the tooth 34 and the opposing surfaces of the teeth will slide` 0 framework 42 and through it the link and 20 1s turned w1th respect to the annular hub driven shaft will stop.

The link and lever mechanism may be iaeaa circularly adj'us with reference to the shifter 40 and consequently the angular displacement of the tooth 4:4 with respect to thetoothetv before-contact takes place may besogvaried' as to cause-this release to occur at` any load --which the operator may desire. Inother words, it isavvariable overload releasecapable of being set at any predetermined: amount;

lltfwillube seen. that in eect the mechanismcomprises a coupling. of the driving and driven shaft, a dynamometer or means for measuring the power transmitted, means for measuring the torque, an automatic overload release and means for indicating and recording the measurement of power.

What I claim as new is l. The combination of a driving shaft and a clutching plate rigidly securedthereto, va driven shaft, a clutched plate loosely mounted thereon, an elastic connection between the driven shaft and the clutched plate, and means for recording the torque transmitted through said elastic part, including a spark gap device comprising two contacts for automatically measuring or `recording the angular relation of the two shafts.

2. The combination of a'driving shaft and a clutching plate rigidly secured thereto, a driven shaft, a clutched plate loosely mounted thereon, a coupling device `whereby the clutch is moved to operation position,means for automatically disengaging said clutched plate from said clutching plate, a coiled spring interposed between the clutched plate and the driven shaft, and means for recording the torque of the driving shaft in winding up the spring.

3. ln a device of the character described, a driving shaft, a driven shaft, an intermediate clutch comprising a coiled spring, and

a coupling device longitudinally movable on the driven shaft in combination with a spark gap device comprising two contacts for automatically measuring the angular relation of the two shafts including a suitable dial, a pointer moving in harmony with the driven shaft and means for intermittently passing an electrical current between the dial and pointer as the driven shaft revolves.

4. ln a device of the character described,

, a driving shaft, a driven shaft, an intermediate clutch comprising a coiled spring, and

a coupling device longitudinally movable on 'and a couplin device longitudinally movplaced in operative position against the clutch when the coupling device is moved vin one direction, in combination with a spark gap `device comprising two contacts for automatically measuring or recording the angular relation of the two shafts including a suitable dial, a pointer moving in harmony with the driven shaft'and means for intermittently passingan electrical current between the dial and pointer as the driven shaft revolves.

6. In a device of the character described, a driving shaft, a driven shaft, an intermediate clutcli comprising a coiled spring, andI a coupling device longitudinallv movable on the driven shaft and comprising a link and lever mechanism adapted to be placed in operative position against the' clutch when the coupling device is moved in one direction, and to be disengaged therefrom when it is moved in the opposite direction in combination with a spark gap device comprising two contacts for automatically measuring or recording the angular relation of the two shafts.

7. In a device of the character described, a driving shaft, a driven shaft, an intermediate clutch comprising a coiled spring, and a coupling device longitudinally movable on the driven shaft and comprising a vlink and lever mechanism adapted to be placed inoperative position against the clutch when the coupling device is moved in one direction, and to be disengaged therefrom when it is moved in the opposite direction in combination with a spark gap device comprising two contacts for automatically measuring or recording the angular relation of the two shafts including a suitable dial, a'pointer moving in harmony withv the driven shaft and means forintermittently passing an electrical current between the dial and pointer as the driven shaft revolves.

8. In a device of the character described, a driving shaft, a driven shaft, a clutch, a coupling device whereby the clutch is moved to an operative position, a hub rigidly secured to the driven shaft and carrying a projecting tooth, and a tooth on the coupling device adapted to contact with the first named tooth and thereby move the conpling to throw the clutch to an inoperative position, in combination with a conducting pointery on the driven shaft, a conducting pointer on the coupling and a spark gap system with which they are in circuit.

9. Thelcombination with a driving shaft,

l a driven shaft, an intermediate clutch, and

lll@

a coiled spring through which the power is transmitted, of a conducting pointer -carried by each shaft, and aA spark gap system connected with both pointers for automatically measuring or recelving a record of the angular relation of the two shafts including asuitable dial.

10.The combination with a driving shaft a driven shaft, an intermediate clutch, and

a coiled spring through which the power is transmitted, of a conducting pointer carried by each shaft, and a spark gap system connected with both pointers and means for receivingv a record of the torque of Athe driven shaft.

`l1. The combination with a driving shaft a driven shaft, an intermediate clutch, and a coiled spring through which the power is transmitted, of a conducting pointer carried by each shaft, and a spark ga system connected with both pointers 'and fmeans for measuring or receiving a record of lture in\-pre sence of two witnesses.

In testimony whereof I aiix my signae JOHNA. RANDALL.

Witnesses:

ALAN C. McDoNNELL, E. W. Somma, Jr.