US1418725A

US1418725A - Recording instrument

Info

Publication number: US1418725A
Application number: US369482A
Authority: US
Inventors: David T May
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1920-03-29
Filing date: 1920-03-29
Publication date: 1922-06-06
Anticipated expiration: 1939-06-06

Description

D. T. MAY.

RECORDING INSTRUMENT.

APPLICATION HLED MAR, 29,1920. 1,418,725. t n d une 6, 1922.

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D. T. MAY.

RECORDING INSTRUMENT.

APPLICATION HLED MAR, 29, 1920.

Patented June 6, 1922.

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UNITED STATES PATENT OFFICE.

DAVID '1. MAY, OF NEW YORK. N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY,

I INCORPORATED, OF NEW YORK, N. 'Y., A CORPORATION OF NEW YORK.

RECORDING INSTRUMENT.

Specification of Letters Patent.

To all'whom it'may concern:

, Be it known that 1, DAVID T. MAY, a citizen of the United States, residing at New York city,in the county of New York, State of New York, have invented certain new and useful Improvements in Recording Instruments, of which the following is a full, clear, concise, and exact description.

This invention relates in general to recording instruments and particularly to motion recording instruments. The device herein described may be termed a cable motion analyzer and recorder.

The object of the invention is to provide a means for analyzing and graphically recording the character and degree of motion in suspended or supported members such as cables, beams and the like.

Aerial cables of the lead sheath type have been found to be subject to a cutting action which is due to stresses induced by external forces. An analysis of the amount and char acter of the strains in such a cable forms a basis for calculating the stresses causing such strains. Having determined these stresses the main difliculty of overcoming their effects is obviated.

The invention is also useful in the measurement of strains in columns, beams and such structural members, which strains are due to loading and temperature stresses and the like. I

Other useful applications of the invention will occur to'those skilled in the art.

In the invention in its preferred form, a system of rods transfer the motion from a frame rigidly fastened to the cable, to levers which cooperate withother levers each of which actuates a stylus to describe a curve on a moving sheet of paper. The ordinates of the curve correspond to the amplitude of the components of the cables motion.

The invention may be better understood by reference tot-he drawings which show its preferred embodiment and in which Fig. 1 shows a front view, Fig. 2 a side view with portions cut away to show the ,working parts, and Fig. 3 a general view showing the manner in which the apparatus is set up in practice for recording motions of an aerial telephone cable. Like parts are designated by like reference characters.

. A base 1 is seated on the bracket 2 by means of adjustable screws 3. The standards 4 are secured to the base 1 by the screws 5. Standards 6 are secured ,to the base 1 by screws 7. Strips 8 serve to

brace standards

4 and 6 together and are secured by the screws 9. Strips 10 and 11 brace the standards 4 together and are secured by the thumb screws 12.

A spring motor 13 provided with a drive wheel 14 meshing with the wheel 15 imparts motion to the drum 16 journalled in the standards 6. A crank 17 is provided to wind the spring motor 13. r

A paper record sheet 18 is wound on a spool having the journals 23 supported by the standards 6. The sheet 18 is drawn between the roller 21 supported by the standards 4, and the felt faced. roller 22 rotating in the vessel 24. Sheet 18 passes over the roller 20 and roller 19 both of which rollers are supported by the standards 4. The end of the sheet 18 is fastened in a'suitable manner to the outer surface of the drum 16 which imparts to the sheet a substantially uniform rate of motion.

A stop motion device 25 is provided which swings on a pivot 30 in a flange of the standard 4. Device 25 is provided with teeth to mesh with the teeth of wheel 14. It is also provided with a tooth-like projec- Patented June 6, 1922.

tion 26 which is adapted to follow in a worm rotated by means of a pulley 28 over which I a cord 29 is passed. Pulling on one end of the cord 29 therefore operates the device to stop the motor 13, and pulling on the other end allows the motor 13 to start.

Spur wheels 31 supported by spring members 32 which in turn are fastened to the strip 11, serve to make suitable indentations which serve as axes forv purposes'hereinafter described.

To a pole 33 is fastened a bracket 34 which in a suitable manner supports a stranded steel cable A lead sheathed cable 37 is suspended from cable 35 by means of hangers 36.

A frame, consisting of the jaws 38, side plates 39 and 40 and bolts 41 and 46 having the wing nuts 44'and 45, is fitted rigidly to the cable 37 at a point where it is desired to take measurements.

Horizontal rods

47 and 48 are adjustably joined by a tube 49 which slides over the ends of each. Tube 49 is provided with 1011- gitudinal slots and tapered threads on which the knurled nuts 50 are screwed. When the nuts 50 are screwed down the tube closes on the

rods

47 and 48 holding them firmly in place. The rod 47 is pivotally attached to the plate 40 by means of ,the member 51.

Rod 48 is pivotally attached to the lever 53 standards 4 by means of bolts and wing nuts 61, terminates in a fork shaped end 56. The fork 56 engages pin 55 projecting forwardly on the lever 57. Lever 57 is pivotally at tached to the strip 10 by pivot member 58.

An indelible pencil 59-is fixed in the end of lever 57 and adjusted to bear on the strip 18. Horizontal motion of the cable 37 is thus translated from the frame by the

links

47 and 48 to the lever 53, and by lever 53 to the pencil 59 through the means of lever 57.

The distance from member 51 to pivot 52 is relatively long so that for any torsional or vertical motions to which the cable is ordinarily subject, no horizontal motion of the

rods

47 and 48 will take place.

Rods 42 and 61 are provided with a tube 67 and locking nuts 68 similar to tube 49 and nuts 50 respectively. Rods 42 and 61 are aligned on the bolt 41 so that their center line is vertical and if projected would pass through the center of cable 37. In this position, rod 61 is connected to bell crank 62 at the pivot 63. Bell crank 62 is supported by means of the pivot member 64 fixed on the transverse arm 60. Bell crank 62, through pivot 66, transfers the vertical mo tion of cable 37 to rods 65 and 71, which are provided with adjusting tube 69, and fastenlug nuts 70. A lever 73 is provided pivotally fixed to transverse arm 60 by pivot member 74 and is connected to rod 71 by the pivot joint 72. Lever 73 is provided with a forked end 75 to engage pivot 76 of the lever 78. Lever 78 is supported on strip 10 by pivot member 77. An indelible pencil 79 is fixed in the end of lever 78 to bear on i the sheet 18 and is adapted to describe a a curve thereon whose ordinates are proportional to the magnitude of the vertical motion in cable 37.

Pivot members 88' and 89 are located on the plate member 40 such that horizontal planes passing through the pivots thereof will be equidistant from the center of the cable '37. Rods 80 and 81, having the adjusting tube 84 with nuts 86, are pivotally connected to member 88. Rod 81 is also connected by means of pivot 90 to lever 92.

Rods

82 and 83 having the adjusting tube 85 with nuts 87: are pivotally connected 'to member 89. Rod 83 is pivotally connected to lever 93 by means of pivot 91. Lever 93 is pivotally supported on transverse arm 60 by pivot members 100. 'Lever 92 is supported on lever 93 by pivot member 94 and and 93 are so proportioned that the ratio of the distance between the centers of pins 96 and 90, to the distance from the center of pivot of member 100 to the center of pin 91, is equal to the ratio of the distancebetween pivot member .94 and the center of pin 90,

to the vertical distance between the center of pin .91 and the pivot of member 94. Thus a purely horizontal motion of'the cable 37 produces no motion in the pencil 99. A torsional motion of cable 37 however makes the levers 92 and 93 swing in opposite directions and the difference thereof being a measure of such torsional motion, is recorded by the pencil 99.

The vessel 24 is partly filled with water so that the felt faced roller 22 moistens the sheet 18. The spur wheels 31, =revolving' on the face of the moistened sheet 18, cut in dentations therein which serve as zero lines which the pencils 79, 5'9 and 99 follow when the cable 37 is at rest. It has been found less confusing to indent the zero line in-the paper than to trace it by means of pencil markings. The indelible pencils 79, 59, and 99 mark the moistened paper sheet 18 with the slightest pressure thereby interfering very little with the free motion of the various levers.

A guide member 101 supported by transverse arm 60, and fastened thereto by the bolts and wing nuts 102, is provided with apertures 103 through which the horizontal rods pass. The member 101 supports all of the horizontal rods in such apertures when the apparatus is not in use.

A suitable cover 105 is also provided as a protection against the weather.

What is claimed is:

1. An instrument for recording independently and simultaneously the horizontal, vertical and torsional components of the motion of a body, which instrument consisits of a system of levers and link members for each of said components, a recording means for each such system of levers, and a single means for transferring from such body to the said systems of levers and link members the respective component motions of the said body.

2. A motion analyzing and recording apparatus comprising a frame adapted to clamp about the body whose motion is to be analyzed; a system of bars and-levers for each component of such motions, a set of recording styli each of said systems cooperating with said frame to produce a magnified motion in a corresponding stylus, a record sheet adapted to pass under such styli and receive the record of the component motions therefrom; and means for producing motion, in said record sheet.

A motion analyzing and recording apparatus comprising a frame adapted to be clamped about the body Whose motion is to be investigated; a system of bars and levers to translate and magnify the horizontal com ponent of such motion; a system of bars and levers to translate and magnify the vertical component of such motion; a system of bars and levers to translate and magnify the torsional component of such motion; a stylus for each of said systems and arranged to be actuated thereby; a record sheet adapted to receive the record from each said stylus; and means for giving to said sheet a continuous uniform motion under said styli.

t. In a motion analyzing and recordin apparatus, a frame adapted to be clamped on the body whose motion is to be analyzed;

a horizontal bar to translate the horizontal component of such motion from said frame; a system of levers actuated by said horizontal bar; a stylus operated by said system of levers; two bars so attached to said frame that the relative difference of motion therein is a measure of the torsional movement of said frame; a system of lovers differentially connected and actuated by said two bars; a

1 stylus operated by said system of differential levers adapted to record such torsional movement; a bell crank, a rod adapted to translate the vertical motion of said frame to said bell crank; a system of levers for magnif ing said vertical motions, a stylus adapte to be actuated thereby, a link member arranged to transfer the said vertical motions from said bell crank to said system of levers for ma ifying said vertical motions; a sheet a apted to receive recordsfrom said styli, and means for moving said sheet at a continuous and uniform rate of speed.

5. In a motion analyzing and recording apparatus, a pair of link members so attached to the body whose motion is to be analyzed that the relative difference of mo tion therein is a measure of the torsional movement of the body, a system of levers differentially connected and actuated by said two link members, and recording means operated by said system of differential levers.

6. In a motion analyzing and recording apparatus, a pair of link members so attached to the body whose motion is to be analyzed that the relative difference of motion therein is a measure of torsional movement of the bod a system of levers diiferentially connecte and actuated by said two link members, and a stylus operated by said system of differential levers adapted to re-.

cord such torsional movement.

7. An instrument for recording independently and simultaneously the horizontal, ver-. tical and torsional components of the motion of a body, which instrument comprises translating means for each of such components, recording means for said translating means to indicate the magnitude of said com ponents separately, and a single means associated with the body to actuate the translating means in accordance with the motion thereof. V

In witness whereof, I hereunto subscribe my name this 25th day of March, A. D. 1920.

DAVID T. MAY..