US20100218656A1 - Stripper unit for a punch retainer - Google Patents

Stripper unit for a punch retainer Download PDF

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Publication number
US20100218656A1
US20100218656A1 US12/549,026 US54902609A US2010218656A1 US 20100218656 A1 US20100218656 A1 US 20100218656A1 US 54902609 A US54902609 A US 54902609A US 2010218656 A1 US2010218656 A1 US 2010218656A1
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United States
Prior art keywords
stripper
punch
hollow body
stripper unit
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US12/549,026
Inventor
David J. Moellering
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to US12/549,026 priority Critical patent/US20100218656A1/en
Publication of US20100218656A1 publication Critical patent/US20100218656A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D45/00Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • B21D45/006Stripping-off devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/202With product handling means
    • Y10T83/2092Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096Means to move product out of contact with tool
    • Y10T83/2135Moving stripper timed with tool stroke
    • Y10T83/2163Stripper biased against product
    • Y10T83/2166Spring biased stripper
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/929Tool or tool with support
    • Y10T83/9411Cutting couple type
    • Y10T83/9423Punching tool
    • Y10T83/9428Shear-type male tool
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/929Tool or tool with support
    • Y10T83/9411Cutting couple type
    • Y10T83/9423Punching tool
    • Y10T83/9437Shear-type female tool
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/929Tool or tool with support
    • Y10T83/9457Joint or connection
    • Y10T83/9473For rectilinearly reciprocating tool
    • Y10T83/9476Tool is single element with continuous cutting edge [e.g., punch, etc.]

Definitions

  • the field of the invention pertains to punches and dies for forming holes and depressions in metals.
  • the invention pertains to devices and accessories for preventing work pieces from adhering to punches during high-speed, high production manufacturing.
  • FIGS. 1 and 2 Examples of modern punch retainers are shown in applicant's previous U.S. Pat. Nos. 5,337,835, 5,410,932 and Des. 351,395. Views of these punch retainers are also shown in FIGS. 1 and 2 .
  • Modern punches for certain applications utilize either metal or polyurethane strippers to prevent work piece drag on the punch.
  • the metal stripper units typically extend over the sides of the punch retainers or otherwise interfere with the close placement of punch retainers.
  • Polyurethane strippers require separate metal retainers to accurately position the strippers on the punch retainers. With a view to eliminating some of the disadvantages attendant to previous stripper units, the following more compact stripper unit has been developed.
  • the new stripper unit incorporates a precision threaded plug that preloads a mechanical die spring and simultaneously locates the stripper unit on a commercially available ball-lock punch retainer.
  • the ball-lock punch retainers are commonly used in the tool, die and metal stamping industry, and the new stripper unit is an improvement on various punch stripping units commercially available today. Use of the preloaded mechanical die spring provides for time-tested long life.
  • FIG. 1 is a top plan view of a punch retainer
  • FIG. 2 is a bottom plan view of a punch retainer
  • FIG. 3 is a top plan view of the new stripper unit
  • FIG. 4 is a side exploded view of the new stripper unit
  • FIG. 5 is a side cross-section of the new stripper unit
  • FIG. 6 is a bottom plan view of the new stripper unit.
  • FIG. 7 is a side view of the new stripper unit on a punch retainer.
  • FIGS. 1 and 2 Illustrated in FIGS. 1 and 2 are the top and bottom views of a typical commercially available ball-lock punch retainer 10 .
  • the punch retainer 10 includes bolt holes 12 for attaching the punch retainer to a press platen (not shown), threaded holes 14 with dowel locating holes at bottom, and punch retention hole 16 .
  • the top plan view of the new stripper unit 18 illustrates the very robust stripper body 20 and the movable stripper 22 .
  • the movable stripper 22 is formed with a hole 24 shaped to match the shape of the punch (not shown).
  • FIG. 4 the components of the stripper unit 18 are shown in order of assembly.
  • the stripper 22 is first inserted into the stripper body 20 followed by the mechanical die spring 26 and the precision threaded plug 28 .
  • the precision threaded plug 28 screws into a precision threaded hole 30 in the bottom 32 of the stripper body 20 and seats on an accurately machined counterbore ledge 34 .
  • the upper bore 36 in the stripper body 20 includes a flat 38 , such that the upper bore 36 has a “D” shape.
  • the stripper 22 is also “D” shaped to match the D-shape of the upper bore 36 and thereby provide assembly only in its correct position.
  • FIG. 5 illustrates in cross-section the completely assembled stripper unit 18 . As shown, the precision threaded plug 28 is tightly seated on the counterbored ledge 34 . It is appreciated that FIGS. 4 and 5 teach bottom 32 is generally flat and that threaded plug 28 screws into the precision threaded hole 30 leaving a flush surface across the bottom 32 .
  • the bottom view of the stripper unit 18 shows the precision threaded plug 28 formed with a hexagonal hole 42 therethrough.
  • the flats 44 of the hexagonal hole 42 are sized to accurately contact the punch (not shown) and thereby accurately align the stripper unit 18 over the punch retention hole 16 .
  • the hexagonal hole 42 may be made slightly smaller, whereby each flat 44 is formed with a slight concavity matching the curvature of the punch retention hole 16 .
  • a hex wrench can be used to tighten the precision threaded plug 28 in place.
  • the stripper unit 18 can be perfectly aligned on the punch retainer 10 , as shown in FIG. 7 with a punch (not shown) through the hexagonal hole 42 , before a machine screw (not shown) is inserted through hole 46 in the stripper unit 18 and threaded into hole 14 of the punch retainer 10 to fasten the stripper unit to the retainer.
  • the construction above provides a number of improved features.
  • the precision threaded plug 28 locates the stripper unit 18 while simultaneously pre-loading the die spring 26 for improved die spring life. Because the plug 28 has a precision machined hexagonal hole 42 , the stripper unit 18 is accurately positioned and retained on its mating retainer 10 .
  • the hexagonal hole 42 provides an alien wrench hex over the precision hole to provide for easy assembly and disassembly.
  • the new design provides that all die spring 26 and stripping forces are completely isolated in the very robust stripper body 20 with no force being transferred to any outside component. Fully assembled, the stripper unit 18 is completely “self-contained,” eliminating the risk of components being lost, or, even upon catastrophic failure, any of the units' components being jettisoned into the stamping die.
  • FIGS. 5 and 7 teach the stripper unit 18 can be attached to the punch retainer 10 as a single unit and the bottom 32 can fit flush against the punch retainer 10 .
  • the precision threaded plug 28 is designed to bottom out in its mating pocket in the stripper body 20 , which automatically sets the die spring 26 pre-load and is fail safe, so the spring cannot be overloaded.
  • the new stripper unit 18 universally fits all standard ball-lock punch retainers, and most importantly requires no retainer alterations.
  • the movable or traveling stripper 22 is preferably of a hardened tool steel construction with a lubricating coating to promote smooth stripping movement.
  • the stripper 22 is guided not only by the “D” body shape, but also by the stripper's head diameter or hole size and shape 24 . This provides a much improved condition that will ensure the stripper 22 cannot twist or cock and jam during production and will better facilitate side load to the stripper when stripping non-flat surfaces.
  • the round portion of the stripper 22 and all the round features of the stripper unit 18 are co-located along the centerline of the punch and pierced hole, which simplifies design and manufacture of the stripper unit.
  • the unique “D” shape 40 of the stripper 22 provides a failsafe assembly, allowing the stripper 22 to be assembled in the stripper body 20 only in the correct position.
  • the pre-loading of the die spring 26 and stripper 22 provides instant stripping force upon contact with the work piece.
  • the instant stripping force on contact facilitates simplification of the calculations and timing questions, which are issues, especially with respect to cam activated die applications.
  • the pre-loading also makes the overall stripper unit 18 more compact.
  • the stripper body 20 is a one-piece construction designed with a robust heel for the attachment hole 46 , making the stripper unit 18 more stable and stronger than other stripper units.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)

Abstract

A stripper unit incorporates a precision threaded plug that preloads a mechanical die spring that, in turn, preloads the movable or traveling stripper adjacent the punch tip. The precision threaded plug simultaneously accurately locates the stripper unit on a commercially available ball-lock punch retainer. The stripper unit is entirely self-contained on the face of the ball-lock punch retainer, thus minimizing the space required on the press platen.

Description

    REFERENCE TO RELATED APPLICATION
  • This patent application is a continuation of U.S. patent application Ser. No. 11/485,863, filed Jul. 13, 2006, which claims priority from U.S. provisional patent application Ser. No. 60/706,310, filed Aug. 8, 2005, both of which are incorporated herein in their entirety.
  • BACKGROUND OF THE INVENTION
  • The field of the invention pertains to punches and dies for forming holes and depressions in metals. In particular, the invention pertains to devices and accessories for preventing work pieces from adhering to punches during high-speed, high production manufacturing.
  • Examples of modern punch retainers are shown in applicant's previous U.S. Pat. Nos. 5,337,835, 5,410,932 and Des. 351,395. Views of these punch retainers are also shown in FIGS. 1 and 2. Modern punches for certain applications utilize either metal or polyurethane strippers to prevent work piece drag on the punch. The metal stripper units typically extend over the sides of the punch retainers or otherwise interfere with the close placement of punch retainers. Polyurethane strippers require separate metal retainers to accurately position the strippers on the punch retainers. With a view to eliminating some of the disadvantages attendant to previous stripper units, the following more compact stripper unit has been developed.
  • SUMMARY OF THE INVENTION
  • The new stripper unit incorporates a precision threaded plug that preloads a mechanical die spring and simultaneously locates the stripper unit on a commercially available ball-lock punch retainer. The ball-lock punch retainers are commonly used in the tool, die and metal stamping industry, and the new stripper unit is an improvement on various punch stripping units commercially available today. Use of the preloaded mechanical die spring provides for time-tested long life.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a top plan view of a punch retainer;
  • FIG. 2 is a bottom plan view of a punch retainer;
  • FIG. 3 is a top plan view of the new stripper unit;
  • FIG. 4 is a side exploded view of the new stripper unit;
  • FIG. 5 is a side cross-section of the new stripper unit;
  • FIG. 6 is a bottom plan view of the new stripper unit; and
  • FIG. 7 is a side view of the new stripper unit on a punch retainer.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Illustrated in FIGS. 1 and 2 are the top and bottom views of a typical commercially available ball-lock punch retainer 10. The punch retainer 10 includes bolt holes 12 for attaching the punch retainer to a press platen (not shown), threaded holes 14 with dowel locating holes at bottom, and punch retention hole 16.
  • In FIG. 3, the top plan view of the new stripper unit 18 illustrates the very robust stripper body 20 and the movable stripper 22. The movable stripper 22 is formed with a hole 24 shaped to match the shape of the punch (not shown).
  • In FIG. 4, the components of the stripper unit 18 are shown in order of assembly. The stripper 22 is first inserted into the stripper body 20 followed by the mechanical die spring 26 and the precision threaded plug 28. The precision threaded plug 28 screws into a precision threaded hole 30 in the bottom 32 of the stripper body 20 and seats on an accurately machined counterbore ledge 34.
  • The upper bore 36 in the stripper body 20 includes a flat 38, such that the upper bore 36 has a “D” shape. The stripper 22 is also “D” shaped to match the D-shape of the upper bore 36 and thereby provide assembly only in its correct position. FIG. 5 illustrates in cross-section the completely assembled stripper unit 18. As shown, the precision threaded plug 28 is tightly seated on the counterbored ledge 34. It is appreciated that FIGS. 4 and 5 teach bottom 32 is generally flat and that threaded plug 28 screws into the precision threaded hole 30 leaving a flush surface across the bottom 32.
  • In FIG. 6, the bottom view of the stripper unit 18 shows the precision threaded plug 28 formed with a hexagonal hole 42 therethrough. The flats 44 of the hexagonal hole 42 are sized to accurately contact the punch (not shown) and thereby accurately align the stripper unit 18 over the punch retention hole 16. Optionally, the hexagonal hole 42 may be made slightly smaller, whereby each flat 44 is formed with a slight concavity matching the curvature of the punch retention hole 16. A hex wrench can be used to tighten the precision threaded plug 28 in place.
  • Thus, the stripper unit 18 can be perfectly aligned on the punch retainer 10, as shown in FIG. 7 with a punch (not shown) through the hexagonal hole 42, before a machine screw (not shown) is inserted through hole 46 in the stripper unit 18 and threaded into hole 14 of the punch retainer 10 to fasten the stripper unit to the retainer.
  • The construction above provides a number of improved features. The precision threaded plug 28 locates the stripper unit 18 while simultaneously pre-loading the die spring 26 for improved die spring life. Because the plug 28 has a precision machined hexagonal hole 42, the stripper unit 18 is accurately positioned and retained on its mating retainer 10. The hexagonal hole 42 provides an alien wrench hex over the precision hole to provide for easy assembly and disassembly. The new design provides that all die spring 26 and stripping forces are completely isolated in the very robust stripper body 20 with no force being transferred to any outside component. Fully assembled, the stripper unit 18 is completely “self-contained,” eliminating the risk of components being lost, or, even upon catastrophic failure, any of the units' components being jettisoned into the stamping die. In addition, it is appreciated that FIGS. 5 and 7 teach the stripper unit 18 can be attached to the punch retainer 10 as a single unit and the bottom 32 can fit flush against the punch retainer 10.
  • The precision threaded plug 28 is designed to bottom out in its mating pocket in the stripper body 20, which automatically sets the die spring 26 pre-load and is fail safe, so the spring cannot be overloaded.
  • Unlike some stripper units currently available, the new stripper unit 18 universally fits all standard ball-lock punch retainers, and most importantly requires no retainer alterations.
  • The movable or traveling stripper 22 is preferably of a hardened tool steel construction with a lubricating coating to promote smooth stripping movement. The stripper 22 is guided not only by the “D” body shape, but also by the stripper's head diameter or hole size and shape 24. This provides a much improved condition that will ensure the stripper 22 cannot twist or cock and jam during production and will better facilitate side load to the stripper when stripping non-flat surfaces.
  • The round portion of the stripper 22 and all the round features of the stripper unit 18 are co-located along the centerline of the punch and pierced hole, which simplifies design and manufacture of the stripper unit. The unique “D” shape 40 of the stripper 22 provides a failsafe assembly, allowing the stripper 22 to be assembled in the stripper body 20 only in the correct position.
  • The pre-loading of the die spring 26 and stripper 22 provides instant stripping force upon contact with the work piece. The instant stripping force on contact facilitates simplification of the calculations and timing questions, which are issues, especially with respect to cam activated die applications. The pre-loading also makes the overall stripper unit 18 more compact. The stripper body 20 is a one-piece construction designed with a robust heel for the attachment hole 46, making the stripper unit 18 more stable and stronger than other stripper units.

Claims (9)

1-4. (canceled)
5. A self-contained stripper unit for attachment to a punch retainer having a punch retention hole with a punch received therein, the punch extending from the punch retainer and having a predetermined outside diameter where it extends from the punch retainer, the stripper unit having an installed position wherein it is received on the punch, the stripper unit comprising:
a hollow body having a hole in a flat bottom thereof and an upper bore in the top of the hollow body;
a stripper disposed at least partially within the hollow body and movable in the upper bore;
a die spring engaging the stripper within the hollow body, the die spring located within the hollow body; and
a precision plug received into the hole in the flat bottom of the hollow body so as to engage the die spring, the precision plug having a central passage defined therethrough, the passage having sides, the passage being sized such that the sides contact the predetermined outside diameter of the punch, whereby when the stripper unit is received on the punch, the sides of the passage locate and align the stripper unit on the punch;
the precision plug, the stripper, the die spring and the hollow body being attachable to the punch retainer as a single unit.
6. The stripper unit of claim 5, wherein the upper bore and the stripper have a D-shape to prevent rotation of the stripper relative to the hollow body.
7. The stripper unit of claim 5, wherein the hole in the bottom of the hollow body has a counterbored ledge, the precision plug being seated on the counterbored ledge.
8. The stripper unit of claim 7, wherein the precision plug preloads the die spring.
9. The stripper unit of claim 5, wherein the hole in the bottom of the hollow body is a threaded hole, the precision plug being threaded so as to engage the threaded hole.
10. The stripper unit of claim 5, wherein the stripper has a hole shaped to match a shape of the punch.
11. The stripper unit of claim 5, wherein the precision plug and the flat bottom of the hollow body cooperate to define a flush surface that fits flush against the punch retainer when attached thereto.
12. The stripper unit of claim 5, wherein the passage is a multi-sided hole in the plug.
US12/549,026 2005-08-08 2009-08-27 Stripper unit for a punch retainer Abandoned US20100218656A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/549,026 US20100218656A1 (en) 2005-08-08 2009-08-27 Stripper unit for a punch retainer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US70631005P 2005-08-08 2005-08-08
US11/485,863 US7581475B2 (en) 2005-08-08 2006-07-13 Stripper unit for a punch retainer
US12/549,026 US20100218656A1 (en) 2005-08-08 2009-08-27 Stripper unit for a punch retainer

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/485,863 Continuation US7581475B2 (en) 2005-08-08 2006-07-13 Stripper unit for a punch retainer

Publications (1)

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US20100218656A1 true US20100218656A1 (en) 2010-09-02

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US11/485,863 Active 2027-06-20 US7581475B2 (en) 2005-08-08 2006-07-13 Stripper unit for a punch retainer
US12/549,026 Abandoned US20100218656A1 (en) 2005-08-08 2009-08-27 Stripper unit for a punch retainer

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US11/485,863 Active 2027-06-20 US7581475B2 (en) 2005-08-08 2006-07-13 Stripper unit for a punch retainer

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US (2) US7581475B2 (en)
EP (1) EP1922191B1 (en)
JP (1) JP5827453B2 (en)
CN (1) CN101374643B (en)
WO (1) WO2007018695A2 (en)

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CN104128441A (en) * 2014-07-28 2014-11-05 天津市和海科尔科技发展有限公司 Stabilizing pin for formed metal plate
CN104690171A (en) * 2015-03-31 2015-06-10 重庆平伟汽车模具股份有限公司 Drawing die convenient for part positioning after drawing forming
CN106734624A (en) * 2016-12-31 2017-05-31 滁州市艾德模具设备有限公司 A kind of mould with elastic slide block detent mechanism
US9956601B2 (en) 2012-04-02 2018-05-01 Dayton Progress Corporation Pilot assembly having an integrated stripper that may be coaxial with a pilot

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US20100011932A1 (en) * 2008-07-21 2010-01-21 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Cutting punch holder
US8955364B2 (en) * 2012-12-10 2015-02-17 Standard Lifters, Inc. Pilot assembly with press fit insert/body construction and method for metal forming dies
DE102012112287A1 (en) * 2012-12-14 2014-06-18 Trans Elektro B.V. A system for controlling the breathing air in a confined space and a land or water vehicle equipped with such a system
US9375777B2 (en) 2014-04-29 2016-06-28 Standard Lifters, Inc. Stock ejector assembly
CN104227459A (en) * 2014-08-22 2014-12-24 优德精密工业(昆山)股份有限公司 Rapid machining jig for ball lock mechanism
US20160207214A1 (en) * 2015-01-19 2016-07-21 Dayton Lamina Corporation Stripping devices and punch assemblies
WO2018151337A1 (en) * 2017-02-14 2018-08-23 이윤선 Stripping device for press mold
DE102017123723B4 (en) * 2017-10-12 2023-03-16 Tkr Spezialwerkzeuge Gmbh Hydraulic punching device
US11517955B2 (en) 2018-10-23 2022-12-06 Standard Lifters, Inc. Tapered transition pilot
US11267036B2 (en) 2018-12-27 2022-03-08 Standard Lifters, Inc. Stock lifter assembly
US11707775B2 (en) 2018-12-27 2023-07-25 Standard Lifters, Inc. Stock lifter assembly
US11541445B2 (en) 2019-10-07 2023-01-03 Standard Lifters, Inc. Tight space pilot
DE202019106189U1 (en) * 2019-11-07 2019-11-21 Fibro Gmbh scraper

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JP3168407B2 (en) * 1996-12-26 2001-05-21 康雄 松田 Slide clamper
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US1723935A (en) * 1927-12-08 1929-08-06 Henricson Edwin Punch assembly
US2168377A (en) * 1938-06-09 1939-08-08 George F Wales Punching and stripping mechanism for presses
US4724616A (en) * 1986-06-30 1988-02-16 Adleman Larry G Panel punch
US4899447A (en) * 1988-01-22 1990-02-13 Greenlee Textron Inc. Panel punch
US4862782A (en) * 1988-05-02 1989-09-05 Ernst Robert E Turret punch press tool assembly
US4993295A (en) * 1988-12-08 1991-02-19 Utica Enterprises, Inc. Punch stripper
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USD351395S (en) * 1992-07-29 1994-10-11 Moellering David J One piece ball lock punch retainer
US5337835A (en) * 1992-09-24 1994-08-16 Robert Bosch Gmbh Drill and/or impact hammer
US5709019A (en) * 1994-01-31 1998-01-20 Btm Corporation Apparatus for joining sheets of material
US5992285A (en) * 1994-11-21 1999-11-30 Talarico; Joe Floating punch holder
US6182545B1 (en) * 1999-07-12 2001-02-06 Francis Richard Janek, Jr. Wedge-lockable removable punch and die bushing in retainer
US20060071062A1 (en) * 2002-07-25 2006-04-06 Harald Weigelt Stripping device
US20050132858A1 (en) * 2003-12-22 2005-06-23 Minoru Hayashi Punch stripper
US7707919B1 (en) * 2005-03-21 2010-05-04 Moeller Manufacturing Company, Inc. One-piece stripper retainer for a punch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9956601B2 (en) 2012-04-02 2018-05-01 Dayton Progress Corporation Pilot assembly having an integrated stripper that may be coaxial with a pilot
CN104128441A (en) * 2014-07-28 2014-11-05 天津市和海科尔科技发展有限公司 Stabilizing pin for formed metal plate
CN104690171A (en) * 2015-03-31 2015-06-10 重庆平伟汽车模具股份有限公司 Drawing die convenient for part positioning after drawing forming
CN106734624A (en) * 2016-12-31 2017-05-31 滁州市艾德模具设备有限公司 A kind of mould with elastic slide block detent mechanism

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US20070028737A1 (en) 2007-02-08
JP5827453B2 (en) 2015-12-02
JP2009504412A (en) 2009-02-05
CN101374643B (en) 2013-11-13
WO2007018695A3 (en) 2007-10-18
EP1922191A2 (en) 2008-05-21
EP1922191B1 (en) 2013-02-20
CN101374643A (en) 2009-02-25
US7581475B2 (en) 2009-09-01
EP1922191A4 (en) 2012-01-11
WO2007018695A2 (en) 2007-02-15

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