US1500579A - Tachometer drive - Google Patents

Description

July 8, 1924 1,500,579

w. e. EAGER TACHOMETER DRIVE Filed Aug. 6, 1923 naac. L3

g'mcufc: M5 15 2552.

Patented July 8,1924.

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' Application filed August 6, 1923. Serial No. 656,068.

in View may be briefly summarized as follows 1st: To improve the driving pulley ap:

plied to the car wheel axle by utilizing a split pulley having a plurality of grooves of like diameter to take care of axial movement of the axle and by providing radially adjustable centering pins which make possible its accurate concentric mounting onv a tapering axle.

2nd: To provide a novel type of transmission pulley belted to the axle pulley and made up by assembling standard units of difi'erent diameter which will correspond to different diameters of the car Wheels driving it, it being possible, by the use of different combinations of pulley units, to produce all of the various combination pulleys required from a minimum number of standard parts in stock. I

3rd: To simplify and perfect the drive from the transmission pulley to the tachometer instrument, this being accomplished by a swiveled joint coupling of a flexible shaft to the end of the transmission pulley shaft, .to the end that the drive may be installed with theleast possible expense both for time and material, and with the least possible change in the railway car to which it is applied.

The advantages of my-tachometer drive and the novel details of its construction, which form a part of my present invention, will all be best understood by reference to the accompanying drawings in which an illustrative embodiment of my invention is' disclosed.

According to the drawings:-:-

Fig. lis a side elevation of a railway car equipped withmy drive, part of the truck and part of the car body being broken away to more clearly illustrate the drive.

Fig. 2 is a plan view enlarged of the drive,

as illustrated in Fig. 1.

'Fig. 3 is a detail view of the transmission pulley shaft showingin full lines an assembly of pulley units for the medium size car wheels, the dotted lines showing pulleys which canbeassociated with the pulleys according to the diameters required for the larger or smaller car wheel standards.

Figs. 4 and 5 are end and plan views in detlail of the driving pulley for the wheel ax e.

Similar reference numerals refer to similar parts throughout the drawings.

In the embodiment of my invention illustrated, I show a railway car 1 having a truck 2, standard car wheels 3, and an axle t which tapers towards each end and on which the wheels 3 are mounted. All of the parts thus far described maybe of any standard construction. On the axle 4; I mount a split pulley 5 having a multiple series of grooves of like diameter and having end abutting flanges 6 which are connected by bolts 7 to connect the large end of the pulley about the axle 4:. At the other end of the pulley is a flange 8 extending beyond the pulley proper. I provide in this flange three radial screws 9 set approximately 120 apart on the assembled pulley and adapted to be screwed in until they engage the axle 4 and are in position to center the pulley thereon. Similar screws 10 in pairs are mounted on the flanges 6. These screws 9 and 10 thus take care of the decrease in diameter of the axle and enable the pulley to be properly centered thereon and hold it against slippage on the axle.

15, 16, 17 18 and 19,which have successively and uniformly decreasing diameters. The

pulley units are all similarly constructed except for their differences in diameter, each having on one side an ofi'set hub boss 20 and on the opposite side a corresponding counres the t ree medium sized pulleys 16, 17 and 18 as they would be arran ed on the shaft,

12. For the larger size 0 car wheels the pulley unit 15, would be added and the unit 18 removed, the unit 17 being reversed so as to present its boss 20 in position toabut the adjacent bearing. For the smallest wheel diameters the pulley 19 would be added and the pulley 16 removed. In this manner I am enabled by stocking five sizes of pulley units to build up transmission pulleys having all of the} different diameters which would be requiredin railroad service and I thus simplify the stocking of parts and the application of. the drive'as much as possible. -On

. housing 22 and this serves to drive a chain 23 housed in'a flexible shaft 24 and conmission one end of the shaft a swivel or universal drive (not shown) -is mounted in an angle nected-to the tachometer instrument 25, suitably mounted in the car, so as to drive the: "rotating element thereof, 1 1

Having assembled the apparatus in the manner described and having selected and mounted the appropriate ,groupof transpulleys on the shaft 12, say pulleys 16, 17 and. 18, the belt 11 is applied to the pulleys 5 and 16 and the rotation thereby imparted to the shaft 12 is transmitted througha small floor opening by a flexible shaft 23, 24 tothe instrument, andthe latter will accurately indicate the speed, 'In' rounding curves-the lateral shifting movement-of the axle4 will be cared for by the steelbelt 11 slipping from one to theother ofthe grooves in the pulley 5, thus avoiding undue strain or wear on either of the pulleys which it connects. When tlle car wheel wears and its tread requires to be turned down the practice is' to turn it down each i time o'ne halfan inch, thereby reducing the diameter of the car wheel one inch. When ley 18. In this "way without change or adjustment the machine will always calibrate accu'rately.'

'ThoughI have described with great particularity the details of the embodiment of the invention herein shown, it is not to be construed that I am limited thereto, as changes in arrangement. and substitution of equivalents may be made by those skilled in the artwithout departingfrom the invention as, defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is v 1. In a tachometer "drive, a multi-groove pulley of uniform diameter mounted on the car wheel axle, a driven pulley mounted adjacent to the truck} center, a drive connecting said pulleys, and a flexible drive shaft connecting said transmission pulley and a tachometer, substantially as described.

2. A tachometer drive in accordance with claim 1, in which the elongated pulley on the car wheel-axle is a splitpulley having adjustable means to center it on the axle.

3. A tachometer drive'in accordance with claim 1, in which the elongated pulley is a split pulley havingat each end radial adjusting screws ada ted to engage the car wheel axle and b0 center and' -mount the pulley thereon. I

4. In a tachometer I with a pulley driven by a car wheel axle, of

drive, the combination a pulley shaftmounted on the truck near itsp1vo.tal center, a flexible transmissionleadresponding hub. bosses on one side and hub receiving sockets on the other side. I

In testimony whereof I affix my signature.

comprlsing interchangeable elements which are reversible. and provided with cor-- WILLIAM G. I EAGER.

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