US4026204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press blocking and air logic control system
Assignee: PTI ACQUISITION LLC
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Filing: 1976-03-22
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Granted: 1977-05-31
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Expires: 1996-03-22
Abstract
Abstract The press blocking and air logic control system of this invention embodies a press ram blocking apparatus and air logic circuitry and control means in combination for moving a ram blocking member into ram stopping position thereunder upon the occurrence of one or more events justifying blocking of the press ram, to prevent injury or damage to personnel or equipment which would expectedly result from inadvertence, error or accident. The air logic control circuitry for the blocking device is connected to and in association with conventional press circuitry for the press ram actuating mechanism. For normal press operation, the ram blocking member is retained in retracted position by its air logic control circuitry.
Inventors
- 👤 Maurice James Good
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:01
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
222 words
In a press ram blocking and control system for a press having a frame supporting a movable ram-affixed upper tool holding bolster plate and a lower die plate fixedly supported on said frame, means for reciprocatingly moving said ram-affixed upper bolster plate relative to said lower die plate, and press control circuitry to actuate and control said means to reciprocatingly move a frame supported ram, the improvement comprising in combination a fluid valve, a fluid cylinder communicating with said valve and having a reciprocatingly movable piston and piston rod actuated by operation of said valve, means securing said cylinder and valve to said press frame, a reciprocatingly movable blocking member for said upper bolster plate affixed to the distal end portion of said piston rod projecting from said fluid cylinder, fluid valve control means communicating with said valve and mounted on said press frame in association with and for actuation by said means for moving said upper bolster plate, and fluidic circuitry including said fluid valve, said fluid cylinder and said fluid valve control means responsive to a malfunction in normal press operation, whereby said blocking member is insertable between said movable upper bolster plate and said lower die plate in response to valve actuation of said fluid cylinder piston and piston rod upon the occurrence of malfunction in normal press operation.
Claim 2
Dependent Claim
222 words
In a press ram blocking and control system for a press having a frame supporting a movable ram-affixed upper tool holding bolster plate and a lower die plate fixedly supported on said frame, means for reciprocatingly moving said ram-affixed upper bolster plate relative to said lower die plate, and press control circuitry to actuate and control said means to reciprocatingly move a frame supported ram, the improvement comprising in combination a fluid valve, a fluid cylinder communicating with said valve and having a reciprocatingly movable piston and piston rod actuated by operation of said valve, means securing said cylinder and valve to said press frame, a reciprocatingly movable blocking member for said upper bolster plate affixed to the distal end portion of said piston rod projecting from said fluid cylinder, fluid valve control means communicating with said valve and mounted on said press frame in association with and for actuation by said means for moving said upper bolster plate, and fluidic circuitry including said fluid valve, said fluid cylinder and said fluid valve control means responsive to a malfunction in normal press operation, whereby said blocking member is insertable between said movable upper bolster plate and said lower die plate in response to valve actuation of said fluid cylinder piston and piston rod upon the occurrence of malfunction in normal press operation.
Claim 3
Dependent Claim
28 words
The system defined in claim 1, wherein said fluid valve control means includes means and circuitry for testing said control means to detect a means or circuitry failure.
Claim 4
Dependent Claim
69 words
The system defined in claim 1, wherein said means for reciprocatingly moving said bolster plate comprises a motor driven crankshaft having a cam thereon, and said ram reciprocatingly movable in said frame, said upper bolster plate being affixed to the distal end of said ram, fluid switching components of said fluid valve control means being mounted on said frame for actuation by and upon predetermined rotation of said cam.
Claim 5
Dependent Claim
38 words
The system defined in claim 3, wherein said fluid valve control means comprises fluid actuated limit switches forming a part of said fluidic circuitry and mounted on said press frame in the rotating level path of said cam.
Claim 6
Dependent Claim
36 words
The system defined in claim 1, wherein said means for reciprocatingly moving said bolster plate comprises hydraulic power means, said ram being connected to and reciprocatingly movable in said press frame by said hydraulic power means.
Claim 7
Dependent Claim
69 words
The system defined in claim 5, wherein said fluid valve control means comprises fluid actuated limit switches forming a portion of said fluidic circuitry, means secured to said frame for mounting said limit switches in and adjacent the travel path of said ram-affixed bolster plate, and triggering means on said ram and bolster plate structure to actuate said limit switches in the reciprocating movement of said ram-affixed bolster plate.
Claim 8
Dependent Claim
39 words
The system defined in claim 6, wherein said means for mounting said fluid actuated limit switches to said press frame comprising an adjustable post upon which said limit switches are secured in operative posture relative to said triggering means.
Claim 9
Dependent Claim
38 words
The system defined in claim 1, wherein said means for reciprocatingly moving said bolster plate comprises air cylinder power means, said ram being connected to and reciprocatingly movable in said press frame by said air cylinder power means.
Claim 10
Dependent Claim
69 words
The system defined in claim 8, wherein said fluid valve control means comprises fluid actuated limit switches forming a portion of said fluidic circuitry, means secured to said frame for mounting said limit switches in and adjacent the travel path of said ram-affixed bolster plate, and triggering means on said ram and bolster plate structure to actuate said limit switches in the reciprocating movement of said ram-affixed bolster plate.
Claim 11
Dependent Claim
39 words
The system defined in claim 9, wherein said means for mounting said fluid actuated limit switches to said press frame comprises an adjustable post upon which said limit switches are secured in operative posture relative to said triggering means.
Claim 12
Dependent Claim
37 words
The system defined in claim 1, wherein said blocking member is aligned with respect to said lower die plate so as to move in a plane immediately above said lower die plate and come to rest thereon.
Claim 13
Dependent Claim
34 words
The system defined in claim 1, wherein said blocking member comprises a body portion and means adjustably mounted on said body and extendible upwardly therefrom, so that said blocking member is adjustable in height.
Claim 14
Dependent Claim
32 words
The system defined in claim 1, wherein said blocking member is adjustable as to its height by screw means threadedly mounted in said blocking member and extending upwardly from a surface thereof.
Claim 15
Dependent Claim
24 words
The system defined in claim 1, wherein said blocking member is provided with means preventing rotation of said blocking member in its reciprocating movement.
Claim 16
Dependent Claim
28 words
The system defined in claim 14, wherein said rotation-preventing means comprises a guide rod affixed to said blocking member and slidable in a bearing on said fluid cylinder.
Claim 17
Dependent Claim
27 words
The system defined in claim 14, wherein said rotation-preventing means comprises a guide rod affixed to said blocking member and slidable in a bearing on said frame.
Claim 18
Dependent Claim
23 words
The system defined in claim 1, wherein said fluidic circuitry is connected to, communicates with and is served by a fluid power source.
Claim 19
Dependent Claim
25 words
The system defined in claim 17, wherein a solenoid controlled fluid switch in said fluidic circuitry is connected to and in said press control circuitry.
Claim 20
Dependent Claim
23 words
The system defined in claim 1, wherein said fluidic circuitry comprises the circuitry disclosed herein and illustrated in FIG. 9 of the drawings.
Claim 21
Dependent Claim
18 words
The system defined in claim 19, wherein said fluidic circuitry operates on compressed air as the actuating fluid.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |