US1750956A - Machine for grinding chasers - Google Patents

Description

R. E. FLANDERS MACHINE FOR' GRINDING GHASERS March 18, 1930.

4 Shets-Sheet 1,

Original Filed June 15, 1923 March 18, 1930. R. E. FLANDERS 1,750,956

MACHINE FOR GRINDING 'CHASERS Original Filed June 15. 1923 4 Sheets-Sheet 2 W E Z/Z l I It i g I 1 '6' J March 18, 1930. R. E. FLANDERS 1,750,956

MACHINE FOR GRINDING CHASERs 7 Original Filed June 15. 1923 4 Sheets-Sheet 5 40' v 3,1 ,Arr

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March .1s,'193o.

- Original Filed June- 15 1923 R, FLANDERS 1,750,956

MACHINE FOR GRINDING CHASERS 4 Sheets-Sheet 4 Patented Mar. 18 19 30 UNITED STATES PATENT OFFICE BALI; E. FLANDEBS,

OF SPRINGFIELD, VERMONT, ASSIGNOR T-O JONES & LAMSON MACHINE COMPANY, OF SPRINGFIELD, VERMONT,

A CORPORATION or VERMONT MACHINE FOR GRINDING CHASERS Application filed June 15, 1923, Serial No. 645,515. Renewed June 151929.

This invention relates to a machine for' grinding chasers such as are used to cut threadsin automatic lathes, screw machines and the like, and provides a construction wherein the chaser and grinding wheel are caused to be relatively traversed to grind the length of the chaser threads and to be autolines 33 and 44, respectively, of Figure 2.

Figure 5 is a section on line 55 of Figure 3, the position of the cam drive shaft being indicated. 5 Figure 6 is a detail section on line 6-6 of Figure 5.

Figure 7 is a fragmentary section on line 7-7 of Figure 5.

Figure 8.is an end view of the machine parts being broken away and the work carrier and related parts removed.

Referring to these figures, 1 indicates a machine base, on the upper face of which is mounted for rectilinear motion a traversing carriage 2, this carriage being supported to slide on suitable guideways 3. In the embodiment shown, at one side of this carriage (Figures 1, 2, 3 and 8) is a substantially cylindrical frame 4 to the end of which is. 1'0- tatably fixed, as by clamps 5, a disk 6 having a laterally extending arm 7, this disk andarm having bearings 8 for a grinding wheel shaft 9, the angle of which relative to the horizontal may be varied by turning the disk 6 and fixing it in position by means of the clamping bolts 5. This adjustment is not necessary for the purposes of the present invention, the plane of the wheel being vertical at all times but is a feature of a machine which,

, with some modification, may be employed in the practice of this invention. For an understanding of other advantageous functions of thismachine, which however, are not nec essary for an understanding of the present invention, reference may be had to my application for patent, Serial Number 564,091, filed May 27, 1922, for grinding machines. This shaft 9 carries a grinding, wheel 10 having its face 11 formed to properly grind the threads of the chaser. Opposite the arm 7 the shaft 9 has fixed thereto a belt pulley 12 over which passes a belt 13 extending through an opening 14 in'the arm 7 to a. pulley of a driving motor 15 supported on the frame 4. The frame 4 is permitted a movement"toward and from the carriage 2 and transversely of the motion of this carriage so that the wheel may be advanced to cut the work carried by the carriage or be retracted to clear the work. Extending upwardly from the carriage is a bracket 20 to the upper end of which is pivoted at 21 a bell crank lever 221 This lever has a substantially horizontally disposed arm 23 which at its outer end is pivoted to a vertically arranged slide' 24 mounted to slide in a suitable dovetail guideway 25 of the bracket 20, this being shown more particularly in Figure 2. Theforward face of this slide 24 is cut away as at 26 and is so formed as to provide-a seat against which the 27 of the chaser 28 may bear. The chaser may be held in position by any suitable means, but as herein shown a clamp bridge 30 is employed extending over the chaser and made fast to the bracket and through this bridge is positioned a set screw 31 having its inner end bearing against the outer face of the chaser. The bell crank lever 22 is oscillated to move the outer end of its arm 23 up and down and so cause a vertical traverse of the chaser. by means of a follower 36 thereon engageable within a cam groove 37 of a cam 38. This cam is fixed to rotate-with a shaft 39 extending longitudinally of the carriage and journaled in suitable lugs therein. This shaft 39 has fixed thereto a long gear 40 with which meshes a gear 41 mounted to rotate on a stub This action may be effected somewhat irregular face shaft 42. This gear 41 also meshes with a fixed thereto gear 45 meshes with a pinion fixed to a shaft 51 and this shaft has a gear 52 meshing with a gear 53 fixed to the main drive shaft 54. A This drive shaft extends outwardly of the machine frame whereon it carries any suitable drive mechanism. As herein shown a belt wheel 55 is made fast tothis shaft. The shaft 44 also extends outwardly of the machine frame where it has fixed thereto a gear which meshes with a similar gear 61 on a shaft 62. This shaft 62 extends through the machine frame and has at its opposite end, as shown clearly in Figure 1, a worm 65 which meshes with a worm wheel 66 made fast to a cam,

drum 67 This-cam drum 67 carries cams which effect the traverse of the carriage and which also effect a movement of the wheel toward and from the carriage.

- The traverse of the carriage is effected by 'mea s of a cam disk 70 shown detached in Figure 6', this cam disk having a cam follower 71 bearing thereon, this follower being carried atthe lower end of an arm 72 dep endiiig from the carriage 2. As shown in igure 6 this cam is formed with a plurality of are shaped portions at progressively decreasing. distances radially from the axis of the cam drum. The follower 71 is held in engagement-with the cam 70 by means of a spring, 80 reacting between a portion of the frame ina bracket 81 depending from the.

carriage. The traversing action of the carriage; is merely for the purpose of feeding the chaser so that its several threads may be acted on-successively by' the grinding- Wheel, while the cutting traverse lengthwise 0f the threads is effected by the vertical sliding of the member 24. This cam drum also carries a cam enlargement 75 which acts on ing traverses by successive steps. When all the threads have been acted upon in this manner the cam 70then acts to return the carriage to its former position and at the same out departing from-its spirit or scope as defined by the appended claims.

I claim:

1. In a machine of the class described com prising a grinding wheel, a carriage movable substantially parallel to the axis of rotation of said wheel, a chaser holder movable transversely of said carria 'e to effect relative traversing movement etween the cutting face of said wheel and the chaser lengthwise of the threads thereof, means for reciprocating said holder, and means actingautoinatically between its traverses to move said carf riage to cause successive traverses between the wheel andchaser-to be effected on adjacent threads."

2. A machine of the class described comprising a grinding wheel, a' carriage movable substantially parallel to the axis of said wheel, a slideway on said carria e, a slide movable on said way parallel to t e, plane of rotation of 'said wheel, means to clamp a chaser on said slide with its threads extendmeans for efiecting a relative movement said wheel and carriage to cause said wheel to approach and recede from the threads of the chaser, block to cause said wheel to traverse lengthwise of said threads and means acting between successive traverses to move said carone arm 76-0f the bell crank lever (see F igs e Q P Successive trfwerses to efiect ures 7 and 8), the other end of this armeng afitlon on Successlve threadsgaging at 77 a member 78 having a connection with the frame 4 (see Figure 8). When the high spot of this cam is reached therefore, the member 78 is pushedrea'rwardly by action of the cam 75 thereon and the wheel is thus pushed backwardlyout of contact with the work supported on the carriage, a spring 9 engaging at one end a lug 80 depending from the frame 4 and at its'other end fixed to a portion of the frame 1 being employed to urge the wheel forwardly. The action of the mechanism, therefore, is to cause a vertical reciprocation of the slide 24 carrying the chasertherewith so that as the chaser threads are' presented to the grinding wheel they are ground to a plane surface lengthwise. After each traverse has been effected dr-um having a pair of cam elements ofthe chaser,

v 3. In a machine of the class described-comprising a grinding wheel, a carriage movable ing parallel to .its direction of rotation,

means to effect sliding of.said,

substantially parallel to the axis of said f wheel, a slideway on said carriage, a slide -movable on said way parallel to the planeiof rotation of said wheel, means for clamping a chaser on-saidslide with its threads extending parallel to its direction of sliding motion, a shaft journaledlongitudinally in said carriage, a cam'on said shaft, lever connections from said cam for reciptrocating said slide on 10173131011 01 said sha a cam on, a follower fixedito saidcarriage inoperative engagement with one of said cam elements-for causing a step .by step motion of there'- said carriage between successive reciprocations of said slide to present the cutting face of said wheel successively to adjacent threads a a another follower in operative engagement with" said other cam elementtoj advance and retract saidswheel toward and from the chaser to cause said wheel to engage and then to clear the chaser, and means for driving said cam and said cam drum in proper timed relation.

I haye afiixed my In testimony whereof signature.

RALPH E. FLANDERS.

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