US3640170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retainer for punch and die sets
Assignee: Individual
•
Filing: 1969-12-05
•
Granted: 1972-02-08
•
Expires: 1989-12-05
Abstract
Abstract A retainer mechanism for a headless piercing punch (or the die button) comprising a cylindrical roll pin rotatably journaled in the punch-retainer block and extending at right angles to the longitudinal axis of the punch. The roll pin includes a locking portion intermediate its length which establishes a wedging engagement with an angular cross recess machined in the cylindrical shank of the punch to prevent displacement as the punch is stripped or withdrawn from the workpiece. An actuating screw is threaded into the retainer block parallel to the axis of the punch and has a necked portion in driving engagement with the locking portion of the roll pin so as to impart rotary motion to the roll pin in locking and unlocking directions upon rotation of the actuating screw with a suitable tool. When in the unlocked position the headless shank of the punch is free to be withdrawn outwardly from its bore in the retainer block. As applied to a coacting punch and die set, the angulation of the cross recess of the punch and die button is reversed so that both elements are capable of resisting the withdrawal forces as the piercing end of the punch is withdrawn from the aperture of the die button and workpiece.
Inventors
- 👤 Arthur D Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:02
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/34; Y; Y10; Y10T; Y10T83/00; Y10T83/929; Y10T83/9457; Y10T83/9473; Y10T83/9476
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
329 words
A retainer mechanism for locking and unlocking the working element of a punch and die set with respect to a relatively movable support member of a punch press, said retainer mechanism comprising: a retainer block having one face arranged to be secured to the member of the punch press and having an opposite exposed face; said retainer block having a longitudinal bore extending inwardly from the exposed face thereof for slidably receiving the working element; said retainer block having a cross bore formed therein and disposed generally at right angles to the said longitudinal bore, said cross bore partially intersecting the longitudinal bore and thereby providing a recess interconnecting said bores; a retainer mechanism for locking and unlocking the working element of a punch and die set; locking means rotatably journaled in said cross bore and extending across the recess formed at the intersection of said longitudinal bore and cross bore for engaging and holding the working element against withdrawal from the retainer block; said locking means comprising a cylindrical roll pin rotatably mounted in the cross bore of the retainer block; said roll pin having a cross groove formed therein and residing adjacent the recess formed at the intersecting portion of the longitudinal bore and cross bore; said working element having a longitudinally inclined flat formed in the periphery thereof, the cylindrical profile of the roll pin adjacent the said cross groove adapted to engage the said inclined flat of the working element upon rotation in one direction, thereby to lock the working element in said longitudinal bore by a wedging force developed between the said inclined flat and cylindrical profile of roll pin; said cylindrical profile adapted to disengage the said flat and to release the working element upon being rotated in the opposite direction; and means for imparting rotary motion in forward or reverse directions to said rotatable cylindrical roll pin, thereby to lock and unlock the working element with respect to the said longitudinal bore.
Claim 2
Dependent Claim
329 words
A retainer mechanism for locking and unlocking the working element of a punch and die set with respect to a relatively movable support member of a punch press, said retainer mechanism comprising: a retainer block having one face arranged to be secured to the member of the punch press and having an opposite exposed face; said retainer block having a longitudinal bore extending inwardly from the exposed face thereof for slidably receiving the working element; said retainer block having a cross bore formed therein and disposed generally at right angles to the said longitudinal bore, said cross bore partially intersecting the longitudinal bore and thereby providing a recess interconnecting said bores; a retainer mechanism for locking and unlocking the working element of a punch and die set; locking means rotatably journaled in said cross bore and extending across the recess formed at the intersection of said longitudinal bore and cross bore for engaging and holding the working element against withdrawal from the retainer block; said locking means comprising a cylindrical roll pin rotatably mounted in the cross bore of the retainer block; said roll pin having a cross groove formed therein and residing adjacent the recess formed at the intersecting portion of the longitudinal bore and cross bore; said working element having a longitudinally inclined flat formed in the periphery thereof, the cylindrical profile of the roll pin adjacent the said cross groove adapted to engage the said inclined flat of the working element upon rotation in one direction, thereby to lock the working element in said longitudinal bore by a wedging force developed between the said inclined flat and cylindrical profile of roll pin; said cylindrical profile adapted to disengage the said flat and to release the working element upon being rotated in the opposite direction; and means for imparting rotary motion in forward or reverse directions to said rotatable cylindrical roll pin, thereby to lock and unlock the working element with respect to the said longitudinal bore.
Claim 3
Dependent Claim
190 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which the rotatable locking means comprises a cylindrical roll pin rotatably mounted in the cross bore of the retainer block, said roll pin having a cross groove formed therein and residing adjacent the recess formed at the intersecting portion of the longitudinal bore and cross bore, and in which there is provided a working element having a flat formed in the periphery thereof, the cylindrical profile of the roll pin adjacEnt the said cross groove adapted to engage the said flat upon rotation in one direction, thereby to lock the working element in said longitudinal bore, said cylindrical profile adapted to disengage the said flat and to release the working element upon being rotated in the opposite direction, the means for imparting rotary motion in forward and reverse directions comprising a screw in threaded engagement in the retainer block and in driving connection with the roll pin, whereby longitudinal movement of the screw as a consequence of its rotary motion imparts rotary motion to the roll pin.
Claim 4
Dependent Claim
198 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which the rotatable locking means comprises a cylindrical roll pin rotatably mounted in the cross bore of the retainer block, said roll pin having a locking portion formed intermediate the length thereof, said locking portion being generally rectangular in cross section having three sides provided by cross grooves, formed in the cylindrical roll pin, the fourth side of said locking portion comprising the cylindrical profile of the roll pin which extends across two of said opposed cross grooves, said cylindrical profile constituting a wedging section, said cylindrical wedging section residing adjacent the recess formed at the intersecting portion of the longitudinal bore and cross bore, and in which there is provided a working element having a flat formed in the periphery thereof and disposed in said recess, said cylindrical wedging section of the roll pin adapted to engage the said flat upon rotation in one direction, thereby to lock the working element in said bore and adapted to disengage the said flat and to release the working element upon being rotated in the opposite direction.
Claim 5
Dependent Claim
184 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which there is provided a working element and in which the rotatable locking means comprises a cylindrical roll pin having end portions rotatably journaled in the cross bore of the retainer block, said roll pin having a locking portion formed therein and presented to the recess delineated by the intersection of the said cross bore and longitudinal bore, said locking portion having a plurality of sides and a cylindrical wedging profile, said locking portion delineating a corner, the means for imparting rotary motion comprising an actuating screw in threaded engagement within a bore formed in the retainer block, said locking screw having a necked portion engaging the said corner of the locking portion of the roll pin, whereby rotation of said locking screw in locking direction rotates the roll pin, forcing the said cylindrical profile into wedging engagement with the said working element and rotation of the screw in the opposite direction disengages the wedging profile relative to the working element.
Claim 6
Dependent Claim
107 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which the rotatable locking means comprises a roll pin rotatably mounted in the cross bore of the retainer block, said roll pin having a wedging area adapted to provide a wedging engagement with a working element in the longitudinal bore, said roll pin having a pinion formed therein, the means for imparting rotary motion comprising a rack having teeth engaged with the pinion of the roll pin, and means for shifting said rack longitudinally for rotating the roll pin in locking and unlocking direction.
Claim 7
Dependent Claim
161 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which the rotatable locking means comprises a roll pin rotatably mounted in the cross bore of the retainer block, said roll pin having at least one cross groove formed therein and disposed within the recess at the intersection of the cross bore and longitudinal bore, the roll pin having a wedging area adjacent said cross groove adapted to pRovide a wedging engagement with a working element in the longitudinal bore, said roll pin having a pinion formed therein, the means for imparting rotary motion comprising an actuating screw threaded in said retainer block, said screw having a cylindrical rack formed therein the teeth of which are parallel with one another and engaged with the pinion of the roll pin, whereby rotation of the screw and consequent longitudinal movement thereof rotates the roll pin in locking and unlocking directions.
Claim 8
Dependent Claim
196 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which there is provided a working element and in which the locking means comprises a roll pin rotatably mounted in the cross bore of the retainer block, said roll pin having at least one cross groove formed therein the radius of which is at least equal to the radius of the working element, the roll pin adjacent said cross groove comprising a wedging area adapted to provide a locking engagement with said working element upon rotation of the roll pin in the locking direction, said roll pin having a pinion formed therein, the means for imparting rotary motion to the locking means comprising an actuating screw threaded in said retainer block, a portion of said locking screw having a cylindrical rack formed therein the teeth of which are parallel with one another and engaged with the pinion of the roll pin, whereby rotation of the screw and consequent longitudinal movement thereof rotates the roll pin in locking and unlocking directions for retaining or releasing the working element with respect to the longitudinal bore.
Claim 9
Dependent Claim
146 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which there is provided a working element and in which the face of the retainer block, which is arranged to be secured to the support member of the punch press, includes an inset in the area of the working element, a backup plate seated within said inset and having an upper surface flush with the face of the retainer block, an aperture formed in the backup plate and in the support member of the punch press on an axis common to the central axis of the said working element, and a locating element passing through said aperture and into the support member of the punch press for locating the backup plate and working element relative to the support member of the punch press.
Claim 10
Dependent Claim
183 words
A retainer mechanism for locking and unlocking a working element of a punch and die set as set forth in claim 1 in which there is provided a working element and in which the face of the retainer block, which is arranged to be secured to the support member of the punch press, includes an inset in the area of the working element, a backup plate seated within said inset and having an upper surface flush with the face of the retainer block, the opposite face of the backup plate having a cylindrical recess formed therein, the diameter of which is substantially equal to the diameter of the working element with the end portion of the working element seated within said recess, a bore extending through said recess on an axis common to the central axis of the working element and recess and into the support member of punch press, and a locating element passing through said bore and into the element of the punch press for locating the backup plate and die element relative to the support member of the punch press.
References Cited (Backward Citations)
US1569136A
Cited
US1910296A
Cited
US2420146A
Cited
US3137193A
Cited
US3289519A
Cited
US3535967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |