US1421865A - Tachometer - Google Patents

Description

C. H. VEEDER.

TACHOMETER.

n APPLlcAzoN FILED MAK. v23. 192'1.

Patented July 4, 1922.

2 SHEETS-SHEET l. 1.51.?.

C. H. VEEDER.

TACHONIETER. APPLICATION FILED MAR. 23, 192i.

Patented July 4, 1922. 2 SHEETS-SHEET 2' IVW ATTO/NVE CURTIS nnssiiz vennen., or nanrronn, CONNECTICUT, Assistme-ro Tnn vniinnn MANUFACTURING Co., or HARTFORD, CONNECTICUT, e Gon-BORATION or Coiv-f NECTICUT;

T0 all wiomc't' may concern:

Be it known 'that' 1 Ciiiiris Hnssnr VERDER, a Citizen of the United States, residing in the city of l-la-rtford, inthe State of Connecticut, have inventedcertain new and useful Improvements in Tachoineters,

of which the vfollowing is a specification, reference being hadto the accompanying drawings, forming a part hereof.

This invention relates .to instruments of the same general character as that shown in Letters Patent of 'the United Statesl No. 1,016,906, dated February 6, 1912,'and shown and described therein, 'and in Letters Patent of the United StatesNos. 732,975 and 33,- 358, both dated July k7, 1903, with respect to the speed indicating device, the present instrument, like that shown inA Letters Patent No. 1,016,906, including road measuring de vices aswell as speed indicating devices. In general'tlie speed indicating devices of the present'case are substantially like those of the patents above mentioned and the road measuring devices are substantially like those heretoforeused, but various improvements in details have been made with a view to the attainment ofgreater efficiency, ac -4 curacy and convenience in the operation and use of the instrument, better structural fea-- tures,includingV compactness of the instru ment as a whole, .and greater facility in manufacture, iti being possible in the new instrument to employ for the most part die castings, without much machining. The invention will he morefully explainedherein.

after with reference to the accompanying drawings in which it yis illustrated and in section on the plane indicatedfby vthe broken line 3-3 ofVA Figure 1,*lo'oking in vthe direc-V tion of the arrows.

Figure 4f is a view Y partly4 in horizontal section, on the plane indicated' by the broken Y TiiCrroMnrEn i i Speciiication of Letters Patent..V Pafen'-,ed July 4,1922. appiie'aiion fired Maron as, 192i. semi No. 454,646.

View of apart to be Figure-Z is a .detail view, in froiit elevation, of the lower portionof the tachometer with the front plate removed. A

Figure 8 is a view in vertical central section, similar to Figure 2 but on a'larger scale and with some parts'fbroken out.

Figure 9 is a view in horizontal vsection on the plane indicated by the broken line 9 9 of Figures 2V and 8.

Figures 1 0, 11, 12 and 13 are detail views of different Vparts of the paddle .wheel case.V Figure 141 is a detail view showing `how the .vertical odometer shaft is supported. Figure 15 is a detail view showing one of the connections from the valve seatto be referred to. i

Figurek 16 is adetail View of the valve to be referred to.

The working parts ofthe improved `instrument are enclosedwithin a casing a, the

front plate a of which has at t2 a vertical sight opening in front ,of the tachome'ter tube, with. lowV speed and'highy speed scales marked atftlieright and left thereof, a liori' zontal sight opening a3. in vfrontof the totalizing register or odometer and a sight opening et in front of the trip .or resetting odometer. 1n the rear wallof the casingis an .opening Vfor the support b for the cou pling member@6 of the iiekibl'e driveshaft, such coupling member carryinga bevel gear by vwhichthey tachoineter is driven, and a I worm: b2 by `which the odometer shaft isdriven.V The bevel gear 'bi meshes with aV bevel gear c on the upper, end'of the Apaddle wheel shaft and the 4worm-b2 meshes with a worm gear d on the upper` end of the Figure lV and in section in Figures 3 and 41,

in the opposing faces oftwo frame members odometer shaft CZ', shown in dotted lines in .as hereinafter "described vand has secured thereto awormfcil2 and ,-a worm'ds.. The

worm Z2 meshes with a worm wheel e which,

lthrough a reducing transfer device of ordinary description e, drives the right hand number wheel ci of the totalizing odometer e3. The worm Z3 meshes with a worm wheel f which drives directly the right hand number wheel of the trip odometer f2. The arrangement isV preferablysuch that the n umber vwheel f of thetrip odometer is Vdriven at ten times the speed of the right hand number wheel e2 of the totalizing odometer,

Y so that the righthand number wheel of the trip odometer' may register, for example, tenths of a mile.- rlChe two odometers or-road measuringv devices eand f2 may be of usual construction and are secured to the face plate so that they may be read conveniently through the sight openingsV d3 and at. The resetting shaft f3 of the trip odometer f2, has securedthereto a spur wheel f* engaged by a corresponding pinion f5 on a shaft f6 which is mounted in a suitable bearing secured to the face plate a and, extend ed through the front plate a, bears a thumb wheel f7 so that the observer can convenientlv reset the trip odometer when desired.

Wfithin the casing ct are supported a main casting g and a supplemental casting Zt. In the contacting faces ofthe main casting g and the supplemental casting Zz, as shown at z/ in Figure 6, are formed the bearings for the odometer drive shaft cZ, this construction permitting both of these supporting or frame members g and ZL to be formed as die castings with no boring to receive the shaft d', which is placed in position as the two Y frame members are assembled.k

rlhe main casting or frame member g is formed with a displacement chamber g having a base or foot part g2,`a tubular chamber g3, through which passes therpaddle rwheel shaft c', a channel g4, g5 from the displace- Y ment chamber gto the top of the casting,

a seat g@ for the bearing of the shaft 0, reservoirs 97 and' g8 which communicate through upper and lower channels g and glo, indi- Y cated in part by dotted lines in Figures 7 and Yeo `9and a spherical-valve seat gn. The reser- Vseat for a packing 7c on which rests the lower end of the glass tachometer tube la', whichv stands in a niche 913 formed therefor in the face ofthe main casting g and is heldin place at its upper end by a packing ,7a2 and a channeled plate 7c3, the channel ,Zot of which establishes communication between the channell g4, g5 of the main casting andthe bore of the tube.

A channel gl4 in the casting g establishesV communication between the'bore ofthe tube 7c and the spherical valve seatigll, and otherv channels g and 916 respectively establish connection between the valve seat g11 and the lower or larger paddle wheel chamber The spherical valve Z which rests Vin. the

valve seat gll, and is suitably channeledV at Z, as shown in Figure 16, for co-operationr with the channels g1, g1, andy/16, is held inits seat by suitable packing Z2 Aand a nut Z3 and its stem Z4 has secured thereto a pointer or handle Z5 by which the valve can be turned to establish connectionv between .thel indicator tube Zr and the upper or lower paddle wheel chamber, as may be desired. y

The displacement plunger m is formed with rack teeth on its side, as shownatmV in Figure 7, and is engagedv by a toothed lspindle m2 which passes 4through the cap plate 3 and the 'channel g", being provided eXteriorly with a knob m3 and interiorly with a shoulder m4' which is heldin close contact with the seat formed therefor in the cap plate Z3, by a spring plunger m5. The plunger is guided and held from rotation' by a pin m6 which may be seated in the plate 02 hereinafter mentioned.v s

The open lower end of the displacement chamber g is closed by a plate n which may be held to the base. ofy the casting g Y byl screws n', as indicated in dotted lines 1ny Figures 8 and 9, the plate being preferably formed on its upper surface with an annular sealing rib a2. In order that the paddle wheel case may be formed by die casting, it is'formed in three separate parts 0, o' and 02, each of which is tapered externally soas to make a tight joint with the tapered interior g17 of the base of the main casting, below the displacement chamber. v.The annular;

member o is formed on its under side with an annular sealing channel 03 for the reception 10oY 105Vv iml of the sealing ribV n2 of the rplate n, and is Y i also channeled on its. upper side, as at 04, to

receive the" annular member 0', which isr` r channeled radially, as at 05 rand circumferentially, as at 06, toestablish communication between the lower paddle wheel chamber and y the channel (/15. lt is chambered on its. under side, as at 07, to form, with the member 0 the larger paddle wheel chamber, and is cham bered at itsl upper side, as at 0S, toreceive the upper memberr 02. The latter is chambered von its under side, as at 09, to form,

with the memberY o', the'upper paddle wheel chamber, and is channeled'radially as at 01 and circumferentially as at 0711,1on its under side, to establishcommunicationbetween the 'f' upper paddle wheel chamber and the chan- [f nel gw above referred to. On its upper side v themember 02 is formed with a slee-ve O12,

provided with openings o13 and 014, the sleeve permitting the passage of the paddle wheel shaft c, and the movement of the liquid in the displacement chamber under the influence of the displacement plunger n. It will be evident that by the formation of the paddle wheel casing as three separate members, as described, each member can be made as a die casting, with the respective channels formed as described in the die casting, without subsequent boring or machining of any kind and that when these several members are properly superimposed and pressed into the tapered foot of the main frame or casting, below the displacement chamber and are secured in place by the cap plate, all joints will be tight.

I claim as my invention:

1. In an instrument of the character described, the combination of a main frame. having an open base, two separate members iitted within the base and chambered to form a paddle wheel chamber, one of said members having Jformed in its face adjacent the other member a radial channel and a circumferential channel, and means to retain the said members in place.

2. In an instrument of the character described, the combination of a main frame having an open base tapered interiorly, two

separate members tapered exteriorly to it within the base and chambered to torna a paddle wheel chamber, one of said members having formed in its face adjacent to the other member a radial channel and a circumferential channel, and means to retain said members in place.

3. In an instrument of the character described, the combination of a main frame having an open base, two separate members tted within the base and chambered to form the paddle wheel chamber, one of said members having formed in its face adjacent the other member a radial channel and a circumferential channel, and a cap plate secured to the main frame to close the opening in the base and retain said members in place.

4. In an instrument of the character described, the combination of a main frame having an open base, three separate members fitted within the base and chambered to forni a small paddle wheel chamber and a large paddle wheel chamber, each of two of said members having formed in its face adjacent to the next member a radial channel and a circumferential channel, and means to retain said members in place.

5. In an instrument of the character described, the combination of a main frame having an open base, an indicator tube, two separate members fitted within the base and chambered to form a paddle wheel chamber, one of said members having formed in its face adjacent to the other member a radial channel and a circumferential channel, a

channel being formed in said main frame to establish communication between the indicator tube and said circumferential channel and means to retain said members in'place.

6. In an instrument of the character described, the combination of a main frame having an openbase, three separate members tted within the base and chambered to form a small paddle wheel chamber and a large paddle wheel chamber, each of two of said members having formed in its tace adjacent to the other member a radial channel and a circumferential channel, an indicator tube, channels being formed in the main frame to establish communication between the indicator tube and the said circumferential channels respectively, a valve to determine the connection between the indicator tube and the one or the other of said circumferential channels and means to retain said members in place.

7. In an instrument of the character described, the combination of a main frame, means 'forming in the base of the main frame a small paddle wheel chamber and a large paddle wheel chamber, an indicator tube, the main frame having channels to establish communication between the indicator tube and the small and large paddle wheel chambers respectively, said channels being formed for communication with a valve seat, and a valve seated in said valve seat for determining the connection between the indicator tube and the small and large paddle wheel chambers respectively.

8. In an instrument of the character described, the combination of a main frame having formed in its base a displacement chamber with an open lower end, a separate member fitted in the open lower end of the main frame to form below the same a paddle wheel chamber and having an upwardly eX- tended sleeve open at its lower end for communication with the displacement chamber, a displacement plunger mounted on said sleeve, means to complete the paddle wheel chamber, and an indicator tube, channels being formed in the main frame for communication between the displacement chamber and the upper end of the indicator tube and between the lower end of the indicator tube and the paddle wheel chamber.

9. In an instrument of the character described, the combination of a main frame having a paddle wheel chamber, a displacement chamber and a reservoir chamber formed partly therein, the main frame havforanindicator tube, said main 'frame having also a fcbannel Aof communication between the 'lower end of the indicator tube and thepaddle'wheel chamber and a channel of communication between the paddle Wheel chamber and the upper vend of .the frame, and ya channeledfeap secured to the upper end(Y of the frame, its channel establishing communication between the upper end of the indicator tube and the upper endof the 10 last named channel of the frame.

This specification Ysigned this 14 day of March A. D. 1921.

CURTIS HUSSEY VERDER.

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