Control system for apparatus for friction-fusing overlapping portions of a thermoplastic strapping ligature
Abstract
Abstract The system disclosed herein is adapted to control the overall duration of the operating cycle of a tool for friction-fusing overlapping portions of a thermoplastic strapping ligature. The operating cycle that is controlled includes the withdrawing of the supply end of the strapping material to tension a loop about a package and the oscillation of a strap gripping member to produce the frictional heat for interface melting and subsequent joinder. The control system includes first and second switches connected in a series circuit with an electric motor, with a first switch being normally closed and a second switch being normally open. A single operating means in a form of a manually engageable push button simultaneously actuates the first and second switches, with the first switch immediately returning to the closed position when the push button is released, and with the second switch having a timer connected thereto so that it returns to the first or open position only after a fixed time interval has elapsed during which the motor is energized.
Inventors
- 👤 Robert J Frey
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |