Patent US3766455A successfully refreshed from Google Patents.
US3766455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically operated stapler
Assignee: ERWIN MULLER DT
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Filing: 1972-08-09
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Granted: 1973-10-16
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Expires: 1992-08-09
Abstract
Abstract The operating winding of an electromagnetically operated stapler is in the period of time during the working stroke connected with a capacitor the discharge current of which energizes said winding with a strong current surge whereby a high impact power for driving staples into a work piece is achieved. During the charging period the capacitor is separated from said winding and joined to an alternating current source.
Inventors
- 👤 C Zakrewsky
- 👤 W Taubken
- 👤 E Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:44
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
In an electromagnetically operated tool adapted to be energized by an alternating current potential source and controlled to provide a single power stroke comprising a housing, winding means disposed in the housing, magnetically actuating means movably arranged adjacent the winding means, a manually actuated switch means carried by the housing and adapted to be joined to said winding means for initiation a working stroke of the tool, a capacitor means with one pole connected to said switch means and with the other pole connected to said alternating current potential source, and means controlled by actuation of said switch means for energizing said winding means by the discharge current of said capacitor means and separating said capacitor means from said alternating current potential source.
Claim 2
Dependent Claim
123 words
In an electromagnetically operated tool adapted to be energized by an alternating current potential source and controlled to provide a single power stroke comprising a housing, winding means disposed in the housing, magnetically actuating means movably arranged adjacent the winding means, a manually actuated switch means carried by the housing and adapted to be joined to said winding means for initiation a working stroke of the tool, a capacitor means with one pole connected to said switch means and with the other pole connected to said alternating current potential source, and means controlled by actuation of said switch means for energizing said winding means by the discharge current of said capacitor means and separating said capacitor means from said alternating current potential source.
Claim 3
Dependent Claim
20 words
The tool as claimed in claim 1 wherein said capacitor means is arranged exterior to the housing of the tool.
Claim 4
Dependent Claim
25 words
The tool as claimed in claim 2 wherein said capacitor means together with a quenching and an Ohmic resistance are mounted on a main plug.
Claim 5
Dependent Claim
23 words
The tool as claimed in claim 3 wherein said capacitor means and resistance means are disposed within the housing of said main plug.
Claim 6
Dependent Claim
16 words
The tool as set forth in claim 1 wherein the capacitor means comprise an electrolytic condenser.
Claim 7
Dependent Claim
47 words
The tool as set forth in claim 1 wherein the magnetical actuating means and said winding means are mounted within a frame enclosed by a portion of the tool housing which frame is adapted to relieve the housing from the mechanical forces of the magnetical actuating means.
Claim 8
Dependent Claim
14 words
The tool according to claim 6 wherein the winding means is composed of aluminium.
Claim 9
Dependent Claim
17 words
The tool according to claim 7 wherein said winding means is wound of an oxidized aluminium foil.
Claim 10
Dependent Claim
43 words
The tool according to claim 6 wherein the winding means is mounted between two crosspieces inserted in said frame, which crosspieces form a guide for the armature and an extension pin of said armature, which extension pin is adjacent the magnetically actuating means.
Claim 11
Dependent Claim
23 words
The tool according to claim 9 wherein on the upper crosspiece a cover plate is secured absorbing the recoil action of the armature.
Claim 12
Dependent Claim
29 words
The tool according to claim 9 wherein said pin constituting an extension of the armature and abutting a lever of the magnetic actuating means is made of antimagnetic material.
Claim 13
Dependent Claim
15 words
The tool according to claim 11 wherein the pin is made of a niCkel-manganese-steel alloy.
Claim 14
Dependent Claim
23 words
The tool according to claim 11 wherein the lower end portion of the pin abutting the lever is provided with a hardened insert.
Claim 15
Dependent Claim
17 words
The tool according to claim 1 wherein the frame is made of ferromagnetic material, particularly sheet iron.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |