US3842476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-operational punch
Assignee: Individual
•
Filing: 1973-06-12
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Granted: 1974-10-22
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Expires: 1993-06-12
Abstract
Abstract A certain type of mine bolt expansion shell has shell halves secured to either end of a metal strap and a wedging nut, the strap being bent on either side of the nut to hold the assembly together. Assembly requires bending over tongues projecting from the shell halves, trueing the shell halves, and bending the strap. A punch and die for performing these operations at a single station has die recesses in which all the parts can be assembled and arranged and a punch which can be advanced and withdrawn by means of a press for bending the tongues and trueing the halves in a first operation, the punch including ram means for performing the bending operation after the first operation is complete. Withdrawal of the die after the first operation automatically initiates operation of the ram means.
Inventors
- 👤 J Prince
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:58
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/36; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49922; Y10T29/53; Y10T29/53039; Y10T29/53061; Y10T29/53065; Y10T29/53313; Y10T29/53383; Y10T29/53387; Y10T29/534; Y10T29/53417; Y10T29/53422; Y10T29/53709; Y10T29/53996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
266 words
A punch and die combination for performing a plurality of operations assembling a mine bolt expansion shell, the shell having a half secured at either end of a connecting strap and a wedge nut, the strap being bent substantially U-shaped on either side of the nut for holding the shell together, the shell halves having tongues bent over by a staking operation to secure them to the straps and requiring trueing by a coining operation, the bending into U-shape of the strap constituting the assembly operation; the die having a platform with an elongated recess for receiving a partially bent strap and recesses for receiving the shell halves at either end of the strap, the platform being supported on springs, each shell half recess having a base supported portion for staking the tongues, the elongated recess having a spaced pair of members at its center; the punch having press portions for forcing the shell halves against the die and a ram portion for forcing a wedging nut at the center poRtion of the strap down between the spaced members for bending the strap U-shaped, the punch being adapted to be carried by a press for forcing the shell halves against the die and then for withdrawing the press portions, independent motor means for advancing the ram portion against the wedge nut for forcing it down and then withdrawing the ram portion, the independent motor means being secured to the press portion of the punch, and means for automatically initiating operation and withdrawal of the second motor means upon withdrawal of the press portion of the punch.
Claim 2
Dependent Claim
266 words
A punch and die combination for performing a plurality of operations assembling a mine bolt expansion shell, the shell having a half secured at either end of a connecting strap and a wedge nut, the strap being bent substantially U-shaped on either side of the nut for holding the shell together, the shell halves having tongues bent over by a staking operation to secure them to the straps and requiring trueing by a coining operation, the bending into U-shape of the strap constituting the assembly operation; the die having a platform with an elongated recess for receiving a partially bent strap and recesses for receiving the shell halves at either end of the strap, the platform being supported on springs, each shell half recess having a base supported portion for staking the tongues, the elongated recess having a spaced pair of members at its center; the punch having press portions for forcing the shell halves against the die and a ram portion for forcing a wedging nut at the center poRtion of the strap down between the spaced members for bending the strap U-shaped, the punch being adapted to be carried by a press for forcing the shell halves against the die and then for withdrawing the press portions, independent motor means for advancing the ram portion against the wedge nut for forcing it down and then withdrawing the ram portion, the independent motor means being secured to the press portion of the punch, and means for automatically initiating operation and withdrawal of the second motor means upon withdrawal of the press portion of the punch.
References Cited (Backward Citations)
US1431175A
Cited
US1879078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |