US2572395A - Cam making fixture - Google Patents

Description

Oct. 23, 1951 1.. H. SAVAGE CAM MAKING FIXTURE 3 Sheets-Sheet 1 Filed June 16, 1947 ATTORNEYS me w Oct. 23, 1951 H. SAVAGE CAM MAKING FIXTURE 5 Sheets-Sheet 2 Filed June 16, 1947 ATTORNEYS Oct. 23, 1951 L. H. SAVAGE 2,572,395

' CAM MAKING FIXTURE Filed June 16, 1947 3 Sheets-Sheet 3 Y \fivamo 7 5 LEONARD SAVAGE used in a1 Patented Oct. 23, 1951 UNITED STATES "QFFICE 2,572,395 CAM MAKING FIXTIii'tE Leonard H;- satag; Grandvi ll, Mich; assigiifir to Joseph P; Van Blooys,Grand Rapids, Mich. Application June '16, 194%, serial 1%. ease 2 Claims.

in is directed to a -ifixture b 'srib'ifig t e J9mlines of cams or fil'l'lS rig such cams which are used in automatic screw machines for controlling the movements osmosis in mac'hinin proesses upon rotatih'g' stock, processed in said automatic screw machines or lathes. v

The laying out and marking of the camedges on a fiat, usually circularplate or disk of metal, from which a cam is made, has previously been a long and tedious process, requiring a high degree of skill and knowledge in order to have the finished cam, which produced, function properly in use. With the cam producing fixture which I have produced, cams may be marked and laid out or diagrarnrn'ed on flat plates of steel or like material used in the cams, very readily and perfectly, in a short time and with accuracy. The high degree of skill and kndwledge previously required is not required for successful utilization of the machine of invention. Moreover, the invention which I have made may be embodied in a structure which is without cornpli'cations or complexities of parts either in their fabrication, assembly or use; and is produced economically in a practical and serviceable form to attain the results which have been stated.

An understanding of the invention may be had from the following description, taken in c'onnec tion with the accompanying drawings, in which,

Fig. 1 is a side elevation of the cam marker of my invention shown adjustably secured to the bed of the grinding machine,

Fig. 2 is an end elevation thereof, looking at the structure in Fig. 1 from the right,

Fig. 3 is a plan view,

Fig. 4 is a horizontal section and plan; substantially on the plane of line 4'4 in Fig. 1.

Fig. 5 is a transverse vertical section, and

Fig. 6 is a vertical side elevation of the upper part of the machine, with a modification in the mechanism used for machining the edge portions of the cam disk in the fixture without marking or scribing of the lines of the cam on the disk, the cam produced being that which in the structure shown in Fig. 1 marks or scribes, which is later completed by removing edge portions of the metal from the disk.

Like reference characters refer to like parts in the different figures of the drawings;

In Fig. 1, the bed or table I of the grinding machine, with a horizontal T-slot 2 therein, has the horizontal base 3 of the fixture of my invention located threover, adjustably connected at present on said slot by use of T'-bolts 4 in an old and well for 'gen mt ell edges from 'one' f u a slotleadir'rg from one eas or projec 10h t6 said hole, asfsh-own in Fig. 2-;

quadrant 3;,

permanently "ted t5 the support directly above the r 8; extend in" the s me direction from the plate 5 a planeabove the not 6.; A aste it rile-tinted for s1 h'ieiit on the was 3, which pass therethr W and is adjusted tew'ai 'd or away from the s fport 5 eye screw l'l threading'in'td the ta e, turned by a ban 1e 12 connected to the outer end "ew (Fig: 4): At the edge of v p tto the support 5, an indicator qu drant I3 tea which; in a ninety aegree are thereof,- is divided into a plurality of successiv equal divisions forming a scale of degrees 6n the ninety degrees theme,

A somewhat elbngateu horizontal bar I4; or a generally short inverted T cross section (Fig. 1), is mounted, between its ends, to turn about the vertical axis or a pin i5- iFig. 5), which is fixed to and exteiiqs upwardly from the table ID. A U -s haped stirrup 16 (Fig; 5) is secured to the under side of the guide bar l4 through which the quadrant scale I3 slidably' passes; the center of curvature of the edges of said quadrant l3 being in" the vertical axis of the pin- IS; .The bar may be fixed againstturriing movement at any place to which moved on the pin l5 by a thumb set screw l1, (Fig; 5);, passing through the lower; side of the stirrup I6 against the under side of the A block I8 is slidably mounted upon the par l4 which guides it in its movement. A screw threaded rod I9 is threaded through block 18 at one side and lies alongside" of andgparallel to the guide bar l4; passing through a block 20 securedat theouter en'd; of the guide,bar [4 At the end of said rod; adjacent block 20; a crank 2| is fixed for turning the threaded rod to move the block l8 to difierent positions in the length of the guide bar M. A vertical pin 22 is fixed to and extends above the block l8 (Fig. on which an elongated bar 23 is mounted, midway between its ends, to turn. It has a rack 24 at one side for its length. The .bar 23 at its upper portions is received in a transverse slot in the under side of a rectangular carrier 25, slidably mounted on the upper rods 9. Near its side, farthest away from the support 5, a vertical spindle 26 is rotatably mounted, which at its lower end, immediately underneath the carrier 25, has a gear 21 fixed thereon in meshing en-' gagement with the rack 24. Above the carrier 25 a small table 28 is secured, at the upper side of which a fiat disk 29, from which a cam is to be made, is detachably located. The cam plates 29 used, each has an opening as at 29a (Fig. 3) for a pin on the table 28 to extend into and cause the plate 29 to turn with the table.

A rod 30 is clamped in the opening drilled through the projection I, previously described, and extends over the edge portions of a disk 29. At'its end over the plate, a holder 3| for a spring pressed scribing implement 32 is secured, the

"pointed hardened lower end of which bears with spring pressure against the upper side of the cam j plate 29.

The gear 27, spindle 26, table 28 and the cam plate 29 are rotated by turning the crank 2|, which simultaneously moves the block l8 and the bar and rack 23 and 24 in accordance with the angular position of the guide bar [4 with respect to the quadrant I3. If the bar M was turned from the position shown in Figs. 3 and 4 so as to be at right angles to the rods 8, there would be merely a rotation of the disk 29 without any body movement thereof toward or away from the support 5, as under such conditions the two pins [5 and'22 would be in direct alinement, and bar 23 and rack 24 move in the slot in the underside of the carrier 25 without a change of position of such carrier. If the bar [4 was at its other extreme position, paralleling the rods 8 and 9, rotation of the cam disk 29 would not take place, but it would be moved bodily toward or away from the vertical support 5 in accordance with the direction that the crank 2|, turning the threaded rod I9, was rotated. At intermediate positions between the two extreme positions, there is a combined rotation of the cam plate 29 and a bodily movement as it moves with the carrier 25 on the rods 9. The extent of the bodily movement and also of the rotation of the cam disk varies in accordance with the angular position 'of the bar I4 with relation to the quadrant 13.

Such combined rotation and bodily movement of the cam plate causes the scribing of a line .on the upper side of the cam plate by the marking ,pin 32, thereby defining the outline of the cam desired and its progressive rise or lift from one end, where it is nearest the center of the plate or disk 29 to the other end, where it is farthest away.

After the cam outlined, or the peripheral edges thereof have been thus marked, the marked cam plate 29 is removed and the metal outside of the edges which it is to have, as defined by the marking, is ground away in rough grinding operations, leaving small portions of the plate beyond the scribed marking. It is then again put back on the fixture and the fixture properly adjusted with reference to a grinding wheel, indicated in dash lines at 32, and by properly operating the crank 2| the'cam edge .is ground to exactness.

4 structure is shown. Instead of scribing or marking the lines to which the plate or disk 29 is to be subsequently ground, the cam is finished by the milling of the cam disk at its edges. A bracket 33 is secured at the upper part of the vertical support 5, on which a small electric motor 34 is mounted. Another bracket 35, as shown in Fig. 6, connected with the first bracket and with the motor casing carries a vertical rotating milling tool 36, continuously driven by the motor through the bevelled gearing at 31. As the cam disk or plate 29 is rotated and bodily moved with reference to the vertical milling tool, the metal at the edge portions of the cam is cut away in the desired amounts and in accordance with the selected position at which the bar I4 is set with reference to the quadrant 13, for the selected progressive degree of lift which is wanted in the particular cam which is being processed.

The invention disclosed is very practical and useful and results in a great saving of time and in better and more accurate cam production by operators less skilled than heretofore required.

The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

1. In a structure as described, lower horizontal carrying and guiding means, a table movably mounted thereon, means for adjusting said table to different fixed adjusted positions, an elongated bar member, a stud pivotally mounting said bar on and above the table for adjustability about a vertical axis located between the ends of the bar, means to secure said bar in adjusted position, an upper horizontal carrying and guiding means located in fixed position above the lower carrying and guiding means, a carrier slidably mounted thereon and having a downwardly facing slot extending transverse to said sliding movement,

a vertical shaft rotatably mounted on the carrier, a gear fixed to said shaft, a support above said gear and rotatable with said shaft, said bar having track means extending lengthwise thereof, block means mounted on said bar and movable lengthwise thereof along said track, a rack bar meshing with said gear and mounted for sliding movement in the slot of said carrier, a vertical pin extending upwardly from said block means in spaced relation to the vertical axis of said stud and into said bar, manually operated means for sliding said block means lengthwise of the bar, whereby said vertical pin will move said rack to rotate said shaft and move said carrier to displace the axis of rotation of said shaft.

2. In a structure as described, a table, an elongated bar member, a stud pivotally mounting said bar on and above the table for adjustability about a vertical axis located between the ends of the bar, means for securing said bar in adjusted position, horizontal carrying and guiding means located in fixed position above the table, a carrier slidably mounted thereon and having a downwardly facing slot extending transverse to said sliding movement, a vertical shaft rotatably mounted on the carrier, a gear fixed to said shaft, a support above said gear and rotatable with said shaft, said bar having track means extending lengthwise thereof, block means mounted on said bar and movablelengthwise thereof alongsaid track, a rack bar meshing with said gear and mounted for sliding movement in the slot of said carrier, a vertical pin extending upwardly from said block means in spaced relation to the In Fig. 6, a variation or' modification: in the vertical axis of said stud and into said bar, manually operated means for sliding said block means lengthwise of the bar, whereby said vertical pin will move said rack to rotate said shaft and move said carrier to displace the axis of rotation of said shaft.

LEONARD H. SAVAGE.

REFERENCES CITED Number UNITED STATES PATENTS Name Date Judge Mar. 3, 1936 Atherholt et a1. June 15, 1943 Antos Jan. 9, 1945 Mieth Oct. 16, 1945 Shephard May 16, 1950

Images