US3741056A

US3741056A - Punch device

Info

Publication number: US3741056A
Application number: US00173926A
Authority: US
Inventors: L Saladin
Original assignee: Accurate Manufacturing Co
Current assignee: Accurate Manufacturing Co
Priority date: 1971-08-23
Filing date: 1971-08-23
Publication date: 1973-06-26
Anticipated expiration: 1990-06-26

Abstract

A hand positionable portable perforating device having a punch member retained in the upper arm of a C-shaped frame by a tangentially slotted bushing which functions both as a punch guide by surrounding the periphery of the upper portion of the punch and as a punch retaining member by having a lower portion engaging a shoulder on the punch. A die which is supported in the lower arm by a stepped mounting pad and a mating restraining member is thereby positively locked, aligned and easily disassembled.

Description

United States Patent Saladin June 26, 1973 [5 PUNCH DEVICE 2,953,051 9/1960 Grossman 83/140 3,114,280 12/1963 Schott [751 Invenwr- Lawrence Salad, Evergreen. 2,364,401 12/1944 Stellin 83/686 x Park, Ill. 1

[73] Assignee: Accurate Manufacturing Co., i ry Examiner-l e ster Chicago, Ill. Attorney-Richard J. Myers 22 El d: A 2 1 71 l 1 9 57 ABSTRACT [21 1 Appl' 173926 A hand positionable portable perforating device having a punch member retained in the upper arm of a C- [52] us. Cl 83/140, 83/588, 83/635, h p f ame y a ng n i lly l tted bushing which 83/685, 83/698 functions both as a punch guide by surrounding the pe- [51] Int. Cl B26f 1/14 riphery of the upper portion of the punch and as a [58] Field of Search 83/140, 588, 590, punch retaining member by having a lower portion en- 83/685-691, 698-700, 635 gaging a shoulder on the punch. A die which is supported in the lower arm by a stepped mounting pad and [56] References Cited a mating restraining member is thereby positively locked, aligned and easily disassembled.

11 Claims, 10 Drawing Figures Patented June 26, 1973 3,741,056

2 Sheets-Sheet 1 Patented June 26, 1973 3,741,056

2 Sheets-Sheet 2 PUNCH DEVICE BACKGROUND OF THE INVENTION l. Field of the Invention This invention pertains to a device used in perforating sheet material and having punch and die restraining and mounting members.

2. Description of the Prior Art Hand positionable, portable punching and perforating devices have found great acceptance where low volume production is anticipated and where single or a series of punches, perforations, semi-perforations, or pierces are desired in a sheet material. There are a variety of such punching devices available with the most popular being the C-shaped type having an upper arm housing the punch assembly and lower arm containing the die assembly. Various methods such as set screws and locating pins have been used in the past to retain and guide the punch and die members to insure proper alignment, ease of assembly and replacement, long life, and reliability of operation.

Conventional punching devices are somewhat undesirable when the punch is guided in the bore of the upper arm but not restrained from jumping out when suddenly released from a punched sheet such as frequently occurs as a tool becomes dull. Also, if the punch is not restrained it may fall out during set-up or storage resulting in loss or damage.

Another problem with this type of punching device relates to the method used in positioning and securing the die element in the lower arm. Conventional die securing and positioning methods generally consist of boring out a chamber in the lower arm and inserting the die element which is then held in position by a key which is fitted into a slot on the die. This conventional die securing method is often unacceptable since as the die functions generally high forces are brought to bear on the sides and bottom of the chamber which houses the die, the'bore of the chamber will become oversized thus causing a misalignment between the panel and the die. It is difficult and time consuming to shim up a bore which is oversized and generally the procedure followed is one of boring out the chamber and placing an insert in the new bore diameter. The insert then houses the die.

SUMMARY The present invention relates to a sheet perforating device and concentric adjacent bores in the upper and lower arms of the C-shaped frame. The punch has the usual cylindrical shank and bit portions but also has a tangential flat portion to permit alignment with a guide key which is fastened to the upper arm and also restrains the punch in the bore. A removable and replaceable anvil or washer is fastenable to the top of the punch. A transversely slotted punch guide bushing is positioned below the anvil and surrounding the punch to guide and restrain the punch in its reciprocating vertical movement.

A die assembly located at the end of the lower arm includes the usual cylindrical die member; however, the present invention contemplates a die member having a flat stepped area for alignment with a mating die restraining member. Die restraining members are positioned below the die to provide support and distribute impact forces and a second mating member is fastened on the side of the die member for additional securing of the die. These die assembly members are easilyassembled and disassembled and provide for realigning the die with the punch after die wear has occurred.

Thus, a primary object of the present invention is to provide a band positionable C-shaped punching device having a punch member with a removable and replaceable head portion.

Another object of the invention is to provide a punch member having a flat side portion which is used for alignment and restraining purposes.

A further object is to provide a punch unit having guide bushing including a slot portion through which a retainer or stop plate may extend to engage the punch and prevent movement of the punch beyond a predetermined position.

Another object of theinvention is to provide a punch assembly positively restrained in the bore of a punching device by simple, easily assembled components.

Yet another object of the invention is to provide a die supporting and restraining means which will rigidly support the die and yet allow for easy, quick insertion and removal of the die from the lower arm of the frame.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of the invention with portions removed and partially in section;

FIG. 1a is an enlarged sectional view of the punch assembly of FIG. 1;

FIG. 2 is a top plan view of the device illustrated in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is an exploded view of the die assembly;

FIG. 4a is a view of the die assembly in the partially assembled condition;

FIG. 5 is a pictorial view of the punch guide bushing;

FIG. 6 is a pictorial view of the punch member;

FIG. 7 is a side elevational sectional view of a modification of the punch and die'assembly;

FIG. 8 is a view taken along line 8-8 of FIG. 7.

DETAILED DESCRIPTION The perforating device 10 of the present invention includes a rigid metallic frame 12 of generally C- shaped profile and having an upper arm 14 and a lower arm 16. The perforating device is securely fastened to the press bed 18 as by fasteners 20 which extend through a slot 22 in the lower arm 16 and into spaced and parallel T-shaped slotted rails 24 in the press bed 18. A slot 26 extends vertically through the upper arm 14 and may be used to facilitate tightening of fasteners 20 by wrenches which are inserted through slot 26 to gain access to the fasteners. A pilot pin 28 extends downward from the lower arm 16 and into a closely toleranced locating bore 30 in the press bed 18, to accurately position the punching device 10.

The lower arm 16 includes a cutout or receiving portion 32 into which a die assembly 34 is positioned and secured as by bolts 36.

A discharge chute 38 is located below the die assembly 34 to facilitate removal of metal slugs. The die assembly 34 includes a lower anvil plate 39,1ocking plate member 40 and the die 41. The lower anvil plate 39 has a stepped portion 42, an arcuate or rounded portion 44 and a bore or opening 46 extending the depth of the anvil 39 (see FIG. 4). A die member 41 having an aperture 50 aligned with the bore 46 in the anvil 39, has a flat portion 52 and shoulder portion 53 to implement alignment and securing of the die. The locking and locating plate 40 has a first stepped portion 54 corresponding to and mating with the stepped portion 42 of the lower anvil 39. A second stepped portion 56 (as best shown in FIGS. 1 and 4a) fits over the shoulder 53 of the die 41 to firmly lock die 41 in position.

The upper arm 14 supports the punch and guide assembly 58 which is reciprocally mounted in vertical bore 60. Punch and guide assembly 58 includes: a punch 62 centrally positioned in the bore 60 and in alignment with the die 41; a lower annular collar 64 which guides the punch 62 and holds down the sheet 66 prior to punching; and a punch guide bushing 69 slidably disposed at the upper end of the punch 62. Retainer plate 70 is insertable through the tangential slot 72 in guide bushing 68 and registers against the flat surface 74 of the punch 62 and guide bushing 68 which is engageable with shoulder 75 to retain and align punch 62. A stripping spring 76 extends around the punch 62 between the collar 64 and the guide bushing 68 to bias both members apart.

The punch 62 includes a cylindrical shank 78 and has a replaceable hardened anvil disc 80 fixedly secured as by screw 82 for engagement with the ram of a press and, at its lower end, the punch has a perforating bit 84 which is of reduced diameter of the shank 78.

A lifter spring 86 is positioned between the flange 88 of the collar 64 and the shoulder 90 of the vertical bore 60 to bias the two shoulders apart when the ram of the press is no longer forcing the punch down into engagement with the sheet 66.

In operating, as the ram of a press descends toward the bed 18 striking the hardened anvil 80, the punch guide bushing 68, punch 62, and collar 64 descend toward the sheet 66 in unison compressing spring 86. When contact between the sheet 66 and the collar 64 occurs, the punch 62 and guide bushing 68 continue moving downward as the punch bit penetrates the sheet 66 and the spring 76 is' compressed (see FIG. 1a). As the ram reverses direction and begins its ascent, the opposite occurs with the punch 62 moving upward through collar 64 and thereby the collar 64 acts as a stripper by holding the sheet 66 on the die 41 until the punch bit has been disengaged, thus preventing inadvertent movement of the sheet which could break off the bit 84 of the punch 62 if the bit was not disengaged from the sheet before sheet movement was initiated.

alongside the guide bushing 68a within the tangential slot portions 72a to thereby guide and restrain travel of the bushing 68a.

Along the inner bore of the bushing 68a is a vertically extending slot 73a which receives a part of a key 74a. The key 74a is fixedly secured in an arcuate seat cut in the punch 62.

The die assembly 34 includes a modified die 41a and a modified die restraining block 40a having set screw Operation of the modified version is similar to operation of the first embodiment. The guide bushing 68a and key 74a cooperate with the finger portions 71a of the retainer a to prevent rotation of the punch 62 and also prevent removal of the punch from the vertical bore 60 of upper arm 14.

The die assembly 340 shown in FIG. 7 includes the die member 41a mounted on the anvil mounting member 39 and held in place by the locking plate 40a. Positioned in and extending through locking plate 40a is a set screw retaining member 40b which bears upon the die member 41a to further secure and align the die member 41a.

What is claimed is:

l. A punching device including:

a frame having an upper arm including an opening extending therethrough and including a lower arm spaced from said upper arm,

a punch assembly positioned for reciprocating vertical movement in the opening of said upper arm,

a die assembly positioned in the lower arm in alignment with said punch assembly,

said punch assembly including a punch member and associated guide means therefor having spaced upper and lower punch guide members surrounding the punch member,

resilient biasing means surrounding said punch member and separating said upper and said lower guide members,

said upper guide member including a guide and re-' straining slot means,

retainer means fixedly attached to said upper arm and including a portion extending within said guide and restraining slot means of the upper guide member,

said punch member having a non-arcuate portion,

said upper punch guide member having an opening extending therethrough and said opening having a contour having complemental cooperation with said non-arcuate portion allowing guided nonrotational movement of the punch member.

2. The invention according to claim 1, and

said punch associated guide means being a tangentially extending flat portion in registration with the retainer means for providing general movement of said punch.

3. A punching device including:

said upper guide member including a guide and restraining slot means,

said upper punch guide member including a vertically extending internal slot portion,

a guide key fixedly positioned between said internal slot portion and said punch member.

4. The invention according to claim 3, and

said retainer means including spaced finger portions extending into abutting engagement with said guide and restraining slot means of the upper guide member.

5. A punching device including:

a frame having an upper arm including an opening extending therethrough and including a lower arm spaced from said upper arm, v

a punch assembly'positioned for reciprocating vertical movement in the opening of said upper arm,

said upper guide member including a guide and restraining slot means,

- retainer frnea'ns fixedly attached to said upper arm a die mounted on the' anvil plate and including an alignment and attaching portion,

a locking means including portions engageable with the anvil plate and the die.

6. The invention according to claim 5, and

said locking means including a locating and locking screw member engageable with the die.

7. In a punching device having a frame with an upper arm including a punch assembly positioned for vertical reciprocating movement therein, and a lower arm spaced from said upper arm, a die assembly in said lower arm and comprising:

a supporting plate positioned in said lower arm,

a die member mounted on said supporting plate,

die member locking and aligning means having portions'engageable with the supporting plate and the die member.

8. The invention according to claim 7, and

said die mmber including an alignment portion in registration with said locking and aligning means. 9. The invention according to claim l,'and said restraining slot means including a vertical flat surface on said upperguide member and upper and lower stops on said guide member,

said retainer means engaging said vertical surface in preventing rotation of said upper guide member and said retainer means engaging the upper and lower stops in limiting vertical movement of said upper guide member. I g

10. The invention according to claim 3, and

second resilient biasing means surrounding said lower guide member and providing a return of said lower guide member inwardly of said upper arm.

ll-. The invention according to claim 1', and

k a: 1k

Claims

1. A punching device including: a frame having an upper arm including an opening extending therethrough and including a lower arm spaced from said upper arm, a punch assembly positioned for reciprocating vertical movement in the opening of said upper arm, a die assembly positioned in the lower arm in alignment with said punch assembly, said punch assembly including a punch member and associated guide means therefor having spaced upper and lower punch guide members surrounding the punch member, resilient biasing means surrounding said punch member and separating said upper and said lower guide members, said upper guide member including a guide and restraining slot means, retainer means fixedly attached to said upper arm and including a portion extending within said guide and restraining slot means of the upper guide member, said punch member having a non-arcuate portion, said upper punch guide member having an opening extending therethrough and said opening having a contour having complemental cooperation with said non-arcuate portion allowing guided non-rotational movement of the punch member.

2. The invention according to claim 1, and said punch associated guide means being a tangentially extending flat portion in registration with the retainer means for providing general movement of said punch.

3. A punching device including: a frame having an upper arm including an opening extending therethrough and including a lower arm spaced from said upper arm, a punch assembly positioned for reciprocating vertical movement in the opening of said upper arm, a die assembly positioned in the lower arm in alignment with said punch assembly, said punch assembly including a punch member and associated guide means therefor having spaced upper and lower punch guide members surrounding the punch member, resilient biasing means surrounding said punch member and separating said upper and said lower guide members, said upper guide member including a guide and restraining slot means, retainer means fixedly attached to said upper arm and including a portion extending within said guide and restraining slot means of the upper guide member, said upper punch guide member including a vertically extending internal slot portion, a guide key fixedly positioned between said internal slot portion and said punch member.

4. The invention according to claim 3, and said retainer means including spaced finger portions extending into abutting engagement with said guide and restraining slot means of the upper guide member.

5. A punching device including: a frame having an upper arm including an opening extending therethrough and including a lower arm spaced from said upper arm, a punch assembly positioned for reciprocating vertical movement in the opening of said upper arm, a die assembly positioned in the lower arm in alignment with said punch assembly, said punch assembly including a punch member and associated guide means therefor having spaced upper and lower punch guide members surrounding the punch member, resilient biasing means surrounding said punch member and separating said upper and said lower guide members, said upper guide member including a guide and restraining slot means, retainer means fixedly attached to said upper arm and including a portion extending within said guide and restraining slot means of the upper guide member, said lower arm including a notched portion and a slug ejector chute, an anvil plate positioned in said notched portion, a die mounted on the anvil plate and including an alignment and attaching portion, a locking means including portions engageable with the anvil plate and the die.

6. The invention according to claim 5, and said locking means including a locating and locking screw member engageable with the die.

7. In a punching device having a frame with an upper arm including a punch assembly positioned for vertical reciprocating movement therein, and a lower arm spaced from said upper arm, a die assembly in said lower arm and comprising: a supporting plate positioned in said lower arm, a die member mounted on said supporting plate, die member locking aNd aligning means having portions engageable with the supporting plate and the die member.

8. The invention according to claim 7, and said die mmber including an alignment portion in registration with said locking and aligning means.

9. The invention according to claim 1, and said restraining slot means including a vertical flat surface on said upper guide member and upper and lower stops on said guide member, said retainer means engaging said vertical surface in preventing rotation of said upper guide member and said retainer means engaging the upper and lower stops in limiting vertical movement of said upper guide member.

10. The invention according to claim 3, and second resilient biasing means surrounding said lower guide member and providing a return of said lower guide member inwardly of said upper arm.

11. The invention according to claim 1, and second resilient biasing means surrounding said lower guide member and providing a return of said lower guide member inwardly of said upper arm.