US3749005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control system for a power press
Assignee: Wabash Alloys Inc
•
Filing: 1971-09-30
•
Granted: 1973-07-31
•
Expires: 1991-09-30
Abstract
Abstract An electrical control system for a power press having three different modes of operation known as ''''inch,'''' ''''single stroke, '''' and ''''continuous.'''' The control system incorporates numerous safety features, one of which is that two ''''run'''' buttons must be held depressed at all times during the ''''inch'''' mode, and during the major portion of the downstroke in the ''''single stroke'''' mode so as to avoid the possibility of attempted single-handed operation by the operator, which would leave one hand free to enter the path of the ram. In the ''''single stroke'''' mode, a malfunction of the relay which stops the press ram at the end of each cycle renders the reset circuit inoperative so that the malfunction must be corrected before press operation can be resumed. In the absence of a malfunction, the resetting is performed automatically. In the ''''continuous'''' mode, the ''''run'''' buttons must be held down during a major portion of the downstroke of the ram, and an additional button must be depressed during the first stroke of the ram in order to put the press into the ''''continuous'''' mode of operation. If the mode selector switch is turned from one mode position to another, the system must be reset so that any malfunctions will be detected, thereby preventing the operator from switching from one mode to another to circumvent the effect of a malfunction. Various other fail safe features, redundancies, and double redundancies are also included.
Inventors
- 👤 M Einecker
- 👤 K Mahorney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:15
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/18; F16P3/20; B; B30; B30B; B30B15/00; B30B15/14; B30B15/148
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
211 words
An automatic control system for a power press having a vertically reciprocating ram, said control system comprising the combination of a selector switch having an inoperative position and a first operative position for enabling movement of the press ram through one cycle of reciprocating movement, a second operative position for enabling movement of the press ram through successive increments of its reciprocating cycle according to manually initiated command signals, and a third operative position for enabling movement of the press ram continuously through repetitive cycles of reciprocating movement, reset means operatively connected to said selector switch and including a manually operated actuator for enabling movement of the press ram when said selector switch is in any one of its three operative positions, a pair of spaced apart, manually operated press actuators operatively connected to said selector switch and to said reset means and having operative positions for initiating movement of the press ram when said selector switch is in any one of its three operative positions and when said reset means is actuated, and means responsive to the switching of said selector switch from one of its operative positions to another for stopping movement of the press ram and rendering said press actuators inoperative until said reset means is acutated again.
Claim 2
Dependent Claim
211 words
An automatic control system for a power press having a vertically reciprocating ram, said control system comprising the combination of a selector switch having an inoperative position and a first operative position for enabling movement of the press ram through one cycle of reciprocating movement, a second operative position for enabling movement of the press ram through successive increments of its reciprocating cycle according to manually initiated command signals, and a third operative position for enabling movement of the press ram continuously through repetitive cycles of reciprocating movement, reset means operatively connected to said selector switch and including a manually operated actuator for enabling movement of the press ram when said selector switch is in any one of its three operative positions, a pair of spaced apart, manually operated press actuators operatively connected to said selector switch and to said reset means and having operative positions for initiating movement of the press ram when said selector switch is in any one of its three operative positions and when said reset means is actuated, and means responsive to the switching of said selector switch from one of its operative positions to another for stopping movement of the press ram and rendering said press actuators inoperative until said reset means is acutated again.
Claim 3
Dependent Claim
70 words
An automatic control system as set forth in claim 1 which includes single stroke mode control means responsive to movement of the press ram and operatively connected to said selector switch for automatically stopping the press ram at the end of one cycle of reciprocating movement when said selector switch is in said first operative position regardless of whether said press actuators are operated at the end of said cycle.
Claim 4
Dependent Claim
61 words
An automatic control system as set forth in claim 2 which includes automatic resetting means responsive to movement of the press ram for automatically acutating said reset means at the end of each ram cycle so that successive single strokes of the ram can be effected by operating said press actuators without manually actuating said reset means between successive ram strokes.
Claim 5
Dependent Claim
124 words
An automatic control systEm as set forth in claim 3 which includes second single stroke mode control means responsive to movement of the press ram and operatively connected to said selector switch for automatically stopping the press ram at the end of one cycle of ram movement when said selector switch is in said first operative position regardless of whether said press actuators are in their operative positions at the end of said cycle, said second single stroke mode control means also being responsive to a malfunction of said first single stroke mode control means for rendering said reset means ineffective so that further movement of the press ram is prevented until the malfunction of said first single stroke mode control means is corrected.
Claim 6
Dependent Claim
61 words
An automatic control system as set forth in claim 4 which includes a third single stroke mode control means for rendering said press actuators inoperative in response to a malfunction of said second single stroke mode control means so that further movement of the press ram is prevented until the malfunction of the second single stroke mode control means is corrected.
Claim 7
Dependent Claim
60 words
An automatic control system as set forth in claim 2, which includes control means responsive to movement of either of said press actuators away from its operative position for stopping ram movement and rendering both press actuators inoperative until both of said press actuators are concurrently moved away from their operative positions and then concurrently returned to their operative positions.
Claim 8
Dependent Claim
60 words
An automatic control system as set forth in claim 1 which includes control means responsive to movement of either of said press actuators away from its operative position for stopping ram movement and rendering both press actuators inoperative until both of said press actuators are concurrently moved away from their operative positions and then concurrently returned to their operative positions.
Claim 9
Dependent Claim
77 words
An automatic control system as set forth in claim 7 which includes a continuous mode control means responsive to movement of the press ram and including a manual actuator for automatically repeating successive cycles of ram movement only when said manual actuator is moved to an operative position, when the press ram has traversed a selected initial portion of the first half cycle of ram movement, and when said selector switch is in said third operative position.
Claim 10
Dependent Claim
68 words
An automatic control system as set forth in claim 1 in which said press acutators initiate movement of the press ram, via press operating control means, and which includes means for rendering said press actuators inoperative in response to a malfunction of said press operating control means so that further movement of the press ram is prevented until the malfunction of the press operating control means is corrected.
Claim 11
Dependent Claim
110 words
An automatic control system as set forth in claim 1 which includes means responsive to movement of the press ram and operatively connected to said press actuators for automatically stopping ram movement in response to movement of either of said press actuators away from their operative positions during a selected initial portion of the first half cycle of ram movement, and means operatively connected to said selector switch and responsive to movement of the press ram for automatically continuing movement of the press ram through the remaining portion of the ram cycle regardless of the position of said press acutators, when said selector switch is in said first operative position.
Claim 12
Dependent Claim
35 words
An automatic control system as set forth in claim 1 which includes means for de-energizing the entire control system in response to a grounding of one of said press actuators or the wiring associated thereto.
Claim 13
Dependent Claim
77 words
An automatic control system as set forth in claim 1 which includes a continuous mode control means responsive to movement of the press ram and including a manual actuator for automatically repeating successive cycles of ram movement only when said manual actuator is moved to an operative position, when the press ram has Traversed a selected initial portion of the first half cycle of ram movement, and when said selector switch is in said third operative position.
Claim 14
Dependent Claim
50 words
An automatic control system as set forth in claim 12 which includes a top stop control means having a manual acutator for automatically stopping the press ram at the end of a cycle in response to movement of said actuator to an operative position at any time during said cycle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |