US3819022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety guard device for power presses and the like
Assignee: Safer Marketing AB
•
Filing: 1972-12-29
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Granted: 1974-06-25
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Expires: 1992-12-29
Abstract
Abstract A safety guard device for a power press having a space constituting a path for inserting and taking out workpieces. A movable gate is arranged in the path and a photocell device outside the gate is arranged with the control zone thereof transverse to the longitudinal direction of the path. The gate is provided with driving and control members and the photocell device is provided with control circuits which together mechanically constitute a unit pivotally arranged at the press in such a way that the unit can be moved to a position so that the tool space of the press is easily accessible. An electrical connection is provided between the operation system of the press and the operation control circuit of the unit, which connection is such that it becomes disconnected when moving the unit.
Inventors
- 👤 L Svensson
- 👤 G Julin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:41
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/12; F16P3/14; F16P3/144; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2193
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A safety guard device for power presses and the like having a space constituting a path for inserting and taking out work pieces, comprising a movable gate arranged in the path for inserting and taking out work pieces and a photocell device outside the gate having the control zone thereof transversally to the longitudinal direction of said work piece path, wherein the gate is provided with driving and control members and the photocell device is provided with control circuits which together mechanically constitute a unit pivotally arranged at the press in such a way that the unit can be moved to a position so that the tool space of the press is easily accessible and an electrical connection being provided between the operation system of the press and the operation control circuit of said unit which connection is such that it becomes disconnected when moving the said unit.
Claim 2
Dependent Claim
148 words
A safety guard device for power presses and the like having a space constituting a path for inserting and taking out work pieces, comprising a movable gate arranged in the path for inserting and taking out work pieces and a photocell device outside the gate having the control zone thereof transversally to the longitudinal direction of said work piece path, wherein the gate is provided with driving and control members and the photocell device is provided with control circuits which together mechanically constitute a unit pivotally arranged at the press in such a way that the unit can be moved to a position so that the tool space of the press is easily accessible and an electrical connection being provided between the operation system of the press and the operation control circuit of said unit which connection is such that it becomes disconnected when moving the said unit.
Claim 3
Dependent Claim
62 words
A safety guard device in accordance with claim 1, characterized in that said unit is constituted by a frame structure including guide bars for guiding the gate during the displacement thereof which guide bars are provided with nibs for cooperation with switches connected to the control circuit of the press which switches are arranged remote from the gate inaccessible to the operator.
Claim 4
Dependent Claim
51 words
A safety guard device in accordance with claim 2, characterized in that the driving mechanism of the gate is constituted by a linear induction motor for high speed operation of the gate, wherein there are buffer means provided for braking the movement of the gate and defining the end positions thereof.
Claim 5
Dependent Claim
98 words
A safety guard device in accordance with claim 1, characterized in that said unit is constituted by a frame structure which is movably connected with the press by means of a lever means at the upper portion of the press stand, wherein at least one guide member is arranged at said upper portion of the press stand which guide member is partly curved shaped constituting a guiding surface for cooperation with said frame structure when moved up to an idle position and wherein said guide member constitutes a support to said frame structure in the said idle position.
Claim 6
Dependent Claim
42 words
A safety guard device in accordance with claim 1, characterized in that the electrical connection between the said unit and the operation system of the press is such that when disconnecting the same the press is unable to make any working stroke.
Claim 7
Dependent Claim
41 words
A safety guard device in accordance with claim 1, characterized in that the said unit is provided with side screens for screening off the press tool area and thus making it inaccessible to the operator during the operation of the press.
References Cited (Backward Citations)
US3300009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |