US2415925A

US2415925A - Expanding forming punch

Info

Publication number: US2415925A
Application number: US589375A
Authority: US
Inventors: Lee M Wiley
Original assignee: JULIAN T LETT
Current assignee: JULIAN T LETT
Priority date: 1945-04-20
Filing date: 1945-04-20
Publication date: 1947-02-18
Anticipated expiration: 1964-02-18

Description

Feb. 18, 1947. Q ,w 1 I 2,415,925

EXPANDING FORMING PUNCH Fiied April 20, 1945 t 2 Sheets-Sheet 1 I INVENTOR. 1.55 fi7, M15)? Patented Feb. 18, 1947 EXPANDING FORMING PUNCH Lee M. Wiley, Marion, Ind., assignor of one-half to Julian T. Lett, Marion, Ind.

Application April 20, 1945, Serial N 0. 589,375

7 Claims. 1

This invention relates to a male punch for forming a seamless deep drawn paper receptacle such as a cup which is provided interiorly near its open end with a reentrant groove for cover reception and/or stacking purposes.

A cup of this character is disclosed and claimed in copending application Serial No. 561,-

8'79, filed November 4, 194.4, and entitled Stacking cups and container for same.

The chief object of the present invention is to provide outwardly projectable means for forming a reentrant groove on the inner wall of a paper receptacle.

The chief feature of the present invention resides in groove forming means and the mecha nism for projecting and retracting same from the supporting punch.

Other objects and features of the invention will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

In the drawings Fig. l is a vertical sectional view of the punch embodying the invention.

Fig. 2 is a side elevation thereof and taken at the left side of Fig. 1.

Fig. 3 is a transverse sectional view (looking up) of the cam containing shell and a bottom plan view of the actuating cam ring.

Fig. 4 is a side elevation of the actuating cam ring.

Fig. 5 is a top plan view of the segmental groove creaser in extended relation.

Fig. 6 is a side elevational thereof.

Fig. '7 is an enlarged radial sectional view of a groove creasing segment and the two immediately adjacent portions of the punch.

Fig. 8 is a view similar to Fig. 5 with parts in contracted position.

In Figs. 1 and 2, it! indicates a connecting and actuating portion rigid with base H having passage l3 therethrough and to which maybe selectively connected a source of air pressure or suction depending upon which type of pressure is desired to be utilized.

A base M is suitably secured at l5 to base ii. This base may, with base H, be elongated, see Fig. 2. The former has projecting therefrom the spaced tubular portions it, only one of which is shown herein. This tube It has a central bore ll extending inwardly from its free end [8 and through the tube and base M is the reduced extension !9 enlarged as at 2d at the base end.

Passage 21, through the base and a portion of tube I6, communicates at one end 22 with bore l1 near the inner end thereof and at its opposite end 23 with passage I3.

Housing 24 seated in recess 25 is secured at 26 with and by cover 21. Extending through bases H and it are the registering

passages

28 and 29 respectively and a dual conductor 30 is passed therethrough and connected, after passing through cover 21 to terminals 3|. Transverse channel 32 provides communication between bore 89 and the housing 2'5, see Fig. 1. Busbars are common to all punch heaters.

A male die or punch 33 has a coaxial stem 3 3 projecting therefrom at the anchoring end and said stem, see Fig. 2, includes notch 35 to seat retainer 36 carried by tubular member l6. stem is threaded at 31 to take nut 38 nested in channel 39 in collar 40.

Collar M, at its end opposite the channel 39, includes the external annular reduction or groove 4! and at one side, projecting upwardly therefrom, is the groove or slot 42 registering with extension 32a in the tube Hi. A collar 43 has one end seated in groove ll and an extension or tongue is seatable in the registering grooves 42 and Ma. Locating and securing means 45 and it secure collars l3 and ll) together. Locator 38a prevents relative rotation between nut 38 and collar to. Collar 53 has slot M therein in which is positioned arm E8 to which reference will be had hereinafter.

Stem 3t and punch 33 are provided with a suitable number of elongated passages 48, closed at the stem end and having slightly restricted openings Ell at the opposite and die end, same opening upon the face thereof. Stem 34 has annular channel 5! which registers with cross passage 22, see Fig. 1. By this port and passage arrangement air pressure or suction applied at passage it can be applied at the male die termination of openings 5i! and to the cup for trapped air release, cup retention and cup separation as desired.

This stern and male die includes central bore 52 in the die end of which is mounted electric heater 53. In this bore is an insulation sleeve 5% and therein are current conductors 55 which extend into bore HQ with which bore 52 registers and through cross passage 32 into box 24, there connecting to terminals 21 aforesaid] This provides a heated die structure.

Referrin more particularly to Figs. 1 and 3 to 7, it will be noted, see Fig. 1, between collar 43 and stem 3% is an annular channel 56 in which is oscillatably supported cam ring 51 having on one face an annular series of radial serrations 58. Handle it aforesaid is rigid with said ring and oscillates in slot 5'! in collar 43, see Figs. 1, 2 and 3. v

Adjacent cam ring 51, see Fig. 1, is a co-operating follower and cone ring 59 which has a plate portion 6E! in said channel 56 confronting serrated cam ring 57. It has a confronting series of radial serrations 6| cooperating with serrations 58. Collar 43 has internal shoulder 62 suit- This p ably recessed at 63 (an annular series thereof) to nest springs 64. These springs normally constrain the cone ring serrations into cam ring serration contact.

Shoulder 62 also includes a plurality of spaced (annular series) guide pins 55 which seat and slide in holes 65 in the cone ring. Thus the cone ring is confined to axial movement only and held constrained toward the cam ring and in the rotation of the latter, the cone ring is moved axially against the force of springs 64.

The cone ring has cone face 61. Thereabout are a plurality of creasing or grooving segments, see Figs. 5, 6 and 8. One set 68 is of pie slice segment outline and the other set 69 is of wedge or keystone segment outline. Each segment, see

Figs. 6 and 7, includes a coplaner body portion 10,

an intermediate arcuate projection H, an upper reentrant portion 12 and a lower and larger and deeper reentrant portion 120..

When the segments are extended outwardly, these parts are positioned as shown by full lines in Figs. and 7. When contracted, see Fig. 8, portion H of the pie slice segment is within the projection of portion 12 when extended, see dotted lines Figs. 7. Each segment body portion has depending therefrom an inner arcuate flange 13, see Fig. 1, and each flange is radially and externally recessed as at 14. These flanges nest in channel 15 in the stem end of the male die. In each recess is a spring 16 normally constraining each segment to contracted position. The springs may have the same strength or the keystone segment springs may be stronger as desired.

Each keystone segment 69 at the inner end has inclined face 1'! and each pie slice segment has at its inner end the inclined face 18. These have the same slope. Extension and contraction of the segments is as follows: When the segments are positioned as shown in Fig. 8, handle 48 is shifted in slot il. serrations 58 engage serrations SI of the ring having cone end 61. Since this ring only has axial movement, it, in opposition to springs 5 is forced toward the male die end.

Initially the conical end 6'1 engages inner in- J clined faces 1"! and forces the wedge segments outwardly. In so doing the side faces also force the pie slice segments outwardly as by a squeezing action and in opposition to all springs 64 in all segments. inner inclined faces 18 of the pie segments *68, if not extended by such prior engagement, such segments 68 and the wedge segments 69 are held fully extended as shown in Figs. 5 to 7.

This segment extension occurs only after the male die 23 has been seated in the cup in a receiver mold. Upon segment extension the cup cover nesting seat and retaining inner groove is formed in the cup. Upon contraction of the segments, permitted when handle 48 is returned to original position, the male die may be removed from the receiver mold.

As previously explained, suction applied at 13 permits the seating of die 33 in the cup by removing air trapped between the cup and die, as well as insures cup retention on the die until cup separation is desired. Pressure fluid then applied at I3 ejects the cup from the male die and clears the suction ports 50.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be consid- Thereafter conical end 51 engages 4 ered as illustrative and not restrictive in character.

The several modifications described herein, as well a others which will readily suggest themselves to persons skilled in this art, all are considered to be within the broad scope of the invention, reference being had to the appended claims.

The invention claimed is:

1. A die structure including in combination an oscillatable cam ring, an axial reciprocable cam ring normally constrained to first ring engagement and having a conoidal end, a plurality of segments thereabout and normally constrained toward contracted position, and inclined faces on said segments and conoidal end engageable for segment projection outwardly upon first cam ring axial movement of the second cam ring.

2. A die structure as defined by claim 1 wherein the segments are alternated and one series is of pie slice shape and the other series is of wedge shape.

3. A die structure as defined by claim 1 wherein the segments are alternated and one series is of pie slice shape and the other series is of wedge shape, said conoidal end having initial contact with the wedge segment for Wedge segment projection of the pie segments.

4. A die structure as defined by claim 1 wherein the segments are alternated and one series is of pie slice shape and the other series is of wedge shape, said conoidal end having initial contact with the wedge segment for wedge segment projection of the pie segments, final contact of the conoidal end with all segments retaining all segments in projected position.

5. A die structure as defined by claim 1 wherein there is provided a die head and a detachably connected supporting structure between which is interposed the rings and segments.

6. A die structure as defined by claim 1 wherein there i provided a die head and a detachably connected supporting structure between which is interposed the rings and segments, the latter bein exposed peripherally, the supporting structure having an arcuate slot therein, and a manually oscillatable member in the slot and rigid with the first cam ring for oscillation thereof.

7. A die structure as defined by claim 1 wherein electric heating means for die heating is provided and conductors connected to the heatin means and passing through the confronting rings.

LEE M. WILEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 857,123 Tiffany June 18, 1907 1,549,868 Grotnes Aug. 18, 1925 1,553,504 Buchanan Sept. 15, 1925 2,118,080 Goodwin May 24, 1938 2,278,299 Barbieri Mar. 31, 1942 2,337,581 Wiley Dec. 28, 1943 FOREIGN PATENTS Number Country Date 138,612 Swiss May 16, 1930