Title:
WEDGE-LOCKABLE REMOVABLE PUNCH AND DIE BUSHING IN RETAINER
Document Type and Number:
WIPO Patent Application WO/2001/003860
Kind Code:
A2
Abstract:
A conventional ball lock mechanism has been replaced with a wedge adapted to lock a tool, such as a punch, forming tool or die bushing in a retainer block in which the tool can be accurately positioned relative to the retainer block. The tool is released by moving the wedge away from the retainer block. The inclined surface of the wedge may be inclined upward or downward at an acute angle to the vertical, or the wedge may have both upwardly and downwardly inclined surfaces. The upper portion of the tool is preferably non-circular and is held within a tool cavity formed when the wedge is disposed in the retainer block. One surface of the wedge (its tool-mating surface) is adapted to correspond to the surface of the tool in contact with the wedge. The assembly of wedge slidably disposed within the retainer block is preferably used with a hardened backing plate rather than being secured directly to the die shoe. Several embodiments for securing the wedge in the retainer block are described in each of which the wedge is vertically translatable. The preferred method for forming the wedge is to cut it from a block of hardened tool steel with a wire electric discharge machine.
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Inventors:
JANEK FRANCIS RICHARD JR (US)
Application Number:
PCT/US2000/018502
Publication Date:
January 18, 2001
Filing Date:
July 06, 2000
Export Citation:
Assignee:
JANEK FRANCIS RICHARD JR (US)
International Classes:
B21D28/34; (IPC1-7): B12D/
Foreign References:
| EP0446536A1 | 1991-09-18 | |||
| US3392617A | 1968-07-16 | |||
| DE4125543A1 | 1993-02-04 |
Attorney, Agent or Firm:
Lobo, Alfred D. (L.P.A. Suite 933 The Leader Building 526
Superior Avenue Cleveland, OH, US)
Download PDF:
Claims:
CLAIMS I claim:
| 1. | In a tool construction, the combination comprising: a retainer block having a vertically extending toolandwedge receiving cavity; a tool having an upper portion and a lower portion, said upper portion being adapted to be closely received in said toolandwedge receiving cavity; a wedge means positioned in said cavity said wedge means having at least one wedging surface inclined at an acute angle to the vertical and a tool contacting surface; and fastening means cooperating with said wedge means for releasably locking said upper portion in said toolandwedge receiving cavity. |
| 2. | The tool construction of claim 1 wherein said wedge means has at least one wedging surface inclined at a downwardly acute angle. |
| 3. | The tool construction of claim 1 wherein said wedge means has at least one wedging surface inclined at an upwardly acute angle. |
| 4. | The tool construction of claim 1 wherein said wedge means has a first wedging surface inclined at a downwardly acute angle, and a second wedging surface inclined at an upwardly acute angle. |
| 5. | The tool construction of claim 1 wherein said upper portion is non circular and is nonrotatably locked in said cavity. |
| 6. | The tool construction of claim 1 wherein said tool said upper portion or shank is of noncircular crosssection; and said lower portion or point is of noncircular crosssection which may be the same as, or different from that of said shank. |
| 7. | The tool construction of claim 1 wherein said tool is selected from a punch secured in a punch retainer block, and a die bushing secured in a die retainer block adapted to support a web of material or stock on said retainer block's upper surface. |
| 8. | The tool construction of claim 7 wherein said die bushing has a first upper surface defining a pointreceiving throughpassage therein, and said wedge has a second upper surface; and said first and second upper surface each fails to extend substantially above said retainer block's upper surface. |
| 9. | The tool construction of claim 1 including a backing plate adapted to be secured to said retainer block, said backing plate being adapted to be secured to a die shoe of a punch press. |
| 10. | The tool construction of claim 9 wherein said wedge means has at least one wedging surface inclined at a downwardly acute angle. |
| 11. | The tool construction of claim 9 wherein said wedge means has at least one wedging surface inclined at an upwardly acute angle. |
| 12. | The tool construction of claim 9 wherein said wedge means has a first wedging surface inclined at a downwardly acute angle, and a second wedging surface inclined at an upwardly acute angle. |
| 13. | The tool construction of claim 9 wherein said upper portion is non circular and is nonrotatably locked in said cavity. |
| 14. | The tool construction of claim 9 wherein said tool said upper portion or shank is of noncircular crosssection; and said lower portion or point is of noncircular crosssection which may be the same as or different from that of said shank. |
| 15. | The tool construction of claim 9 wherein said fastening means is a screw threadedly secured in said backing plate. |
| 16. | A method for securing a tool such as a punch, forming tool or die bushing in a retainer block, comprising, forming a vertically extending toolandwedge cavity in said retainer block; forming a wedge adapted to be inserted in said toolandwedge cavity, said wedge having at least one inclined surface and a toolmating surface; shaping said wedge to provide a toolmating surface and a wedgeinclined surface corresponding to an inclined retainerblockcontacting surface; assembling said wedge and retainer block so as to form a tool cavity; inserting said tool within said tool cavity so as to be closely received therein and slidable relative to said toolmating surface; and, securing said wedge in said retainer block so as to provide relative movement between said toolmating surface and said tool sufficient to releasably lock said tool in said cavity. |
| 17. | The method of claim 16 comprising machining said wedgeinclined surface relative to other surfaces of said cavity to a desired tolerance, and said wedgeinclined surface is oppositely disposed relative to said tool mating surface. |
| 18. | The method of claim 16 comprising threadedly securing said wedge in said retainer block. |
| 19. | The method of claim 18 comprising threadedly securing said wedge with a screw threadedly engaged in a backing plate for said retainer block. |
| 20. | The method of claim 18 comprising threadedly securing said wedge with a screw threadedly engaged in said retainer block. |
| 21. | A method for forming a wedge having an inclined surface, inclined to the vertical, and a retainer block having a correspondingly inclined mating surface from a workpiece suitable for forming a tool such as a punch, forming punch or die bushing, said method comprising, locating said workpiece in a traveling wired electric discharge machine, programming said machine to cut a desired outline corresponding to that of a plan view of said wedge having one inclined surface, and cutting said workpiece with a wire electrode so as to form said wedge. |
Description:
ANHANG ANNEX ANNEXE Zum internationalen Recherche", Je-To the International Search Axa rapport de recherche inter- richt uber die internationale Patent-Report to the international Patent national relativ à la demande de anmeldung Nr. Application No. brevet international n° PCT/US 00/18502 SAE 294374 In diesem Anhang sind die Mitglieder der This annex lists the patent family members La pressente annexe indique les membres de Patentfamilien der im obengenannten relating to the patent documents cited in the la famille de brevets relatifs aux documents internationalen Recherchenbericht above-mentioned search report. de brevets cites dans le rapport de angefuhrten Patentdokumente angegeben. The European Patent Office is in no way recherche international visee ci-dessus. Les Diese Angaben dienen nur zur liable for these particulars which are merely renseignements fournis sont donnes à titre Unterrichtung und erfolgen ohne Gewahr. given for the purpose of information. indicatif et n'engagent pas la responsibilite deI'Office. Im Recherchenbericht Datum der Mitglied (er) der Datum der angefuhrte Patentdokumente Veröffentlichung Patentfamilie Veröffentlichung Patent document cited Publication Patent family Publication in search report date member (s) date Document de brevet cite Date de Membre (s) de la Date de dans le rapport de recherche publication famille de brevets publication EP A1 446536 18-09-1991 none US A 3392617 16-07-1968 BE A 692866 03-07-1967 DE A 1602459 30-10-1969 GB A 1157053 02-07-1969 NL A 6702835 04-09-1967 DE A1 4125543 04-02-1993 none