US2424296A

US2424296A - Machine for setting and ejecting preformed spiral studs

Info

Publication number: US2424296A
Authority: US
Inventors: Victor F Zahodiakin
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-10-11
Filing date: 1945-10-11
Publication date: 1947-07-22
Anticipated expiration: 1964-07-22

Description

July 22, 1-947. v, KIN I 2,424,296

MACHINE FOR SETTING AND EJECTING PREFORMED SPIRAL STUDS Filed Oct. 11, 1945 2 Sheets-Sheet l lyyz INVENTOR. VIC-role F." ZAHODIAKIN.

ATTOR N E5.

July 22, 1947. v. F. ZA'HIODIAKIN 2,424,296

MACHINE FOR SETTING AND EJECTING PREFORMED SPIRAL STUDS Filed Oct. 11, 1945 2 Sheets-Sheet 2 I ll Ali

/ q fi 11 BY WCTOEEZAHODIAKIN. 4? 7 ATTORNEY Patented July 22, 1947 MACHINE FOR SETTING AND EJECTING PREFORMED SPIRAL STUDS Victor F. Zahodiakin, Short Hills, N. J.

Application October 11, 1945, Serial No. 621,772

4 Claims.

This invention relates to setting machines and more particularly to a machine for obtaining accurate setting of a spiral blade to precise dimension and twist and has especial utility in connection with cold-twisted blades of spiral studs as for-med in the forming machine of my copending application S. N. 620,950, filed October 8, 1945.

Studs of the character mentioned have to be held within close tolerances which are not uniformly attained by cold twisting the blade, and yet the economy of cold twisting a blade rather than cutting or machining it from round stock, makes it most desirable to use the cold twisting. The economy of cold twisting the blade and the accomplishment of obtaining a product within the requisite shape and dimensional tolerances are incompatible under usual manufacturing procedure and by any machine known to exist.

Broadly considered, therefore, an object of the present invention is to provide means for setting a cold-twisted blade to the shape and dimension of blade within the required tolerance of a machine-cut spiral blade.

More specifically, an object of the invention is to acquire a uniformity of thickness and facial shape of the blade at all cross-sectional parallel planes transverse to the axis of the stud and spiral.

Another object of the invention is to obtain a progressive forming longitudinally of the spiral blade.

A further object is to feed the spiral between forming dies operated thereon only in one direction of movement of the blade.

Yet another object of the invention is to pr vide for release and removal of the spiral blade stud after setting.

Other objects of the invention will appear to those skilled in the art to which it appertains as the description proceeds, both by direct recitation thereof and by inference from the context.

Referring to the accompanying drawings in which like numerals of reference indicate similar parts throughout the several views:

Figure 1 is a front View of a forming machine embodying my invention;

Figure 2 is a plan of the forming dies in forming engagement with the spiral blade of a stud shown in cross section;

Figures 3 and 4 are plans of the left and right forming die sections respectively;

Figure 5 is a front view of the left forming die section;

Figure 6 is an edge view of the left forming die section tilted to show the symmetry of the spiral-engaging end thereof;

Figure 7 is an end view with the section tilted at the same angle of tilt as employed in the showing of Fig. 6;

Figure 8 is a longitudinal section of the form- 2 ing die section of Figures 6 and '7, taken on line 88 of Fig. 7

Figure 9 is a plan of the die holder and release mechanism, with the die sections located in operative position;

Figure 10 is a vertical section parallel to the front of the die holder and taken on line Ill-l0 of Fig. 9;

Figure 11 is a similar section to Fig. 10 and showing the die sections released from forming position; and

Figure 12 is a sectional view of the release mechanism taken on line l2l2 of Fig. 11.

In the specific embodiment of the invention illustrated in said drawings, the reference numeral I5 designates a power press in general having a bed It and a vertically reciprocative head I! thereabove in accordance with usual powerpress construction. A die holder I8, described hereinafter in more detail, is mounted on the bed I 6 and. secured in fixed position thereon as by bolts l9. As will appear more fully in subsequent description, the die sections employed are movable, and operative mechanism therefor has connection with the reciprocative head I! of the press which is shown provided with brackets 20 fixed thereon for the purpose. Said brackets have depending links 2| hinged thereto, said links being shown with turnbuckles 22 for adjustment purposes. At the under side of the reciprocative head [1 is a depending ram 23 by which a stud 24, the spiral blade 25 of which is to be formed, is forced downward as the reciprocative head approaches its lowermost position.

The mechanism carried by bed [6, and identifled above under the general appellation of die holder l8, comprises a block or body portion 26 between the side ends of which and on the top face whereof rests a two-member guide 21. Said guide is shown as an under plate 28 above which is positioned an upper thicker plate 29. Bolts 30 secure the plates together, the heads of the bolts being located in appropriately downwardly shouldered cavities 3| in the block or body portion l8 and the upper threaded ends screwed into the upper plate 29. Thus the guide is held assembled as a unit and also made fast to the block or body portion.

Held slidably in appropriate grooves between the two

plates

28, 29, are, what will be termed for orienting purposes, left and right forming die

sections

32, 33 which extend in a horizontal direction parallel with respect to the front of the guide, have their inner ends near each other and appropriately shaped in conformity to the spiral pitch desired for the stud being formed, and have their outer ends projecting beyond the sides of the guide toward the sides of the block.

Opposite the outer ends of said die sections and carriedon axles 34 supported from the block are 3 cam wheels 35 the peripheries of which are here shown hexagonal with rounded Peaks and with the ends of the die sections held in riding engagement with those peripheries as by springs 36. The flat portions'of'theperipheries constitute the low spots or areas of the cam whereas the round: ed peaks are the high spots or areas thereof. The cams are given a step-by-step or intermittent. rotative impulse and between impulses stand at rest. The rotative impulse for each cam is arranged to move the cam from position'at which one peak engages the die section to position where the next successive peak engages the die section. Both die sections are moved inward simultaneously and outward simultaneously and both are at rest at once.

The intermittent rotative impulse for the cam wheels may be obtained in suitable manner, as by -pawl and ratchet. Inthe present showing, each cam wheel is constructed to also'constitute it a ratchet wheel. This is accomplished by providing a circular series of depressions 31 in the side face of the cam wheel, said depressions being precipitous at one end and sloping outward to high land for the prcipitous end of the next depression. Next the face of the cam having said depressions is a rocker arm'38 trunnioned on the same axle with the cam. Laterally from said arm there is a pin 39 pressed by a spring 40 toward the .depressions and adapted to snap into the deep part thereof at the precipitous end of the depression to function as the pawl. Said arm 38 is connected by link 2 I to the reciprocative head of the press. The depressions of the ratchet arrangement are directedso that the upward movement of the reciprocative head actuates the cam wheel to give itjthe rotative impulse, whereas on the downward stroke of the reciprocative head the pawl idles up the depression slope and snaps into thenext depression.

By -the construction shown and described, the high spots of the cams are engaging and holding the die sections inward as the reciprocative head comes down, andas the head goes up the cams turn from the} one high spot to the next passing a low spot and-at that transitory interval-ofcam surface, the die sections pull away from the work under impetus ofsprings 36. Direction of rotation of the cams is downward at thepart of the periphery engaging the die sections.

Whilethe reciprocative head is raised,the operatorapplies one of the pre-twisted-studsdn-a socket 4| prepared for-the purposeand situated in the middle' of upper plate29 of the two-member guide. This socket 4| extends vertically through the guide and is approximately alined with the ram so the applied work is in position to be forced downward by the ram. The ends of the diesections form a segment of spiral slot andat their inward position of rest form the slot inprecise dimension desired for the cross-section; and particularly define very accurately the distance between and parallelism of the wide faces of the horizontal incrementally successive cross-sections of the required spiral blade. De-

pression of the ram then twirls the blade through the;s piral slot formed bythe dies, correcting distortions, bulges and thelike which the original "twisting ofthe blade may have caused. Then as pressure nozzle 42 may be located immediately below the socket 41 to apply air pressure to force the work rotatively upward as shown in dotted lines in Figure 11. This air pressure is arranged to function only while the die sections are in work-releasing position. Accomplishment of this desideratum is obtained by a valve 43 operated from the same cam that operates the die section. For this purpose a lever 44 is pivoted to the block positioning one end over the depressible valve stemand positioning the other end, with intervening roller 45, in operative engagement with the cam. Spring 46 with strength suflicient to depress the valve stem and to keep the roller 45 in following engagement with the cam surface is carried in the cavity prepared therefor in the block. The cam surface is symmetrical as to arrangement of successive high and low spots, thereby enablingithe valve operating lever to be operated by one low spot or one high spot while the die is being operated by another low or-another high-spot of the same cam.

I claim:

1. A setting machine comprising a channeled guide, die sections slidable toward each otherin the channel of said guide and with ends-0f the die sections facing each other, cams intermittently rotatable for sliding said'die sections simultaneously toward each other at their facing ends for establishing a slot of predetermineddimension between said facing ends of said die sections,=said cams having periods of' rest between the intermittent rotations thereof and maintaining said slot during-said periods of rest of the cams, pawl and ratchet means f orintermittently rotating said cams with-periodsof rest between the intermit tent rotation, and means for forcing work into said slot during periods of rest of the cam.

2. A setting machine comprising a channeled guide, die sections slida'ble toward each other in the channel of said guide and with ends of the die section facing each other, rotatable cams in contact with said die sections and having high spots engageable with the die sections for forcing said'facing ends of the die sections toward each other for establishing a slot of predetermined dimension between said facing ends of the-die sections, said cams having-low spots permitting retraction of said die sections for enlarging the slot and releasingwork therefrom, and means advancing each cam from position of engagement of one high spot thereof to the next andsaid cams providing periods of rest of the cam for .eachsuccessive engagement of a high spot with the die section, and'means for forcing work into said slot duringperiods of rest of thecams.

3. A setting machine comprising incombination with a bed and a reciprocative head-movable toward and away from the bed, a die holder on said bed, the sections alined with each other in said holder in a direction transverse'to-the direction of reciprocation of said head and movable forwardlytoward each other and retractable outwardly from each other, rotatable-cams at the outer ends of said die sections in constant contact with said ends and having high and low spots for controlling forward and retracting movements of said die sections, a lever n'ext each said cam for operating each cam, an intervening pawl and ratchet connection between each said lever and camnext thereto, said pawl and ratchet and cam being constructed and arranged to provide a period of rest for the cam and die section as the pawl recedes over the ratchet and the period ofrest' being at position of the cam REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS being constructed and arranged to move to its lowermost position of reciprocation with the cams and die sections maintained immovably at rest, and links connecting the said reciprocating head and levers and operating said levers in direction receding the pawls as the said head moves toward the die holder.

4. A setting machine in accordance with claim 3 wherein a nozzle is provided in the die holder directed toward the head, and a valve connects with said nozzle for controlling fluid pressure to said nozzle, and a rocker arm is provided for operating said valve, said rocker arm having engagement With one of siad cams whereby said cam serves a double function and the fluid ejection from the nozzle is synchronized with the movement of both the die sections and the reciprocating head.

VICTOR F. ZAHODIAKIN.

Number Number Name Date Weston Mar. 3, 1868 Coleman Sept. 26, 1893 Parkinson June 26, 1894 Baumgarten Nov. 20, 1923 Field Apr. 15, 1840 Jacobson -1 Mar. 4, 1879 Gookin Oct. 17, 1944 Heames et a1. July 26, 1927 Groehn June 30, 1931 DeRentis Feb. 2, 1943 FOREIGN PATENTS Country Date Denmark 1914 Great Britain Apr. 10, 1909 Great Britain Sept. 20, 1926