US3886781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force equalized external stripper for metalworking machines and the like
Assignee: Chromalloy Corp
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Filing: 1974-06-19
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Granted: 1975-06-03
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Expires: 1994-06-19
Abstract
Abstract A stripper surrounds an axially moving ram carrying a tubular article to be stripped therefrom by engagement of a leading edge thereof. A multiplicity of circumferentially adjacent stripper fingers are normally urged forwardly to a preset maximum forward position by individual finger reciprocal pistons which move relatively freely rearwardly from each individual finger engagement with the article leading edge as determined by the leading edge contour. Rearward movement of the finger pistons against a preset volume of liquid forces a portion of the liquid through a header into a liquid collector until substantially all of the fingers have been contacted by the article leading edge, after which, the collector bottoms positively opposing any further liquid flow therein creating through said liquid and finger pistons a positive reverse force stopping rearward movement of said fingers in their individual then rearward positions to strip the article. Various components can be incorporated assisting in stripping once stripping commences, detecting commencement of stripping and detecting lack of an article to be stripped.
Inventors
- 👤 Elpidifor Paramonoff
- 👤 Ralph M Main
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:28
CPC Classifications
B; B21; B21D; B21D45/00; B21D45/06; B21D45/065
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
178 words
In a stripping device of the type wherein frames means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: reactor means operably connected to each of said fingers for normally urging each of said fingers generally axially to a pre-set maximum forward position ready to be contacted by said article leading edge and exerting a minimum reactive force against each of said fingers during individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge dependent on said article leading edge contour until substantially all of said fingers have been so contacted, said reactor means after substantially all of said fingers have been so contacted exerting a substantially immovable reactive force against all of said fingers collectively in the then individual rearward movement positions of each of said fingers to cause said fingers collectively to strip said article.
Claim 2
Dependent Claim
178 words
In a stripping device of the type wherein frames means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: reactor means operably connected to each of said fingers for normally urging each of said fingers generally axially to a pre-set maximum forward position ready to be contacted by said article leading edge and exerting a minimum reactive force against each of said fingers during individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge dependent on said article leading edge contour until substantially all of said fingers have been so contacted, said reactor means after substantially all of said fingers have been so contacted exerting a substantially immovable reactive force against all of said fingers collectively in the then individual rearward movement positions of each of said fingers to cause said fingers collectively to strip said article.
Claim 3
Dependent Claim
178 words
In a stripping device of the type wherein frames means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: reactor means operably connected to each of said fingers for normally urging each of said fingers generally axially to a pre-set maximum forward position ready to be contacted by said article leading edge and exerting a minimum reactive force against each of said fingers during individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge dependent on said article leading edge contour until substantially all of said fingers have been so contacted, said reactor means after substantially all of said fingers have been so contacted exerting a substantially immovable reactive force against all of said fingers collectively in the then individual rearward movement positions of each of said fingers to cause said fingers collectively to strip said article.
Claim 4
Dependent Claim
178 words
In a stripping device of the type wherein frames means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: reactor means operably connected to each of said fingers for normally urging each of said fingers generally axially to a pre-set maximum forward position ready to be contacted by said article leading edge and exerting a minimum reactive force against each of said fingers during individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge dependent on said article leading edge contour until substantially all of said fingers have been so contacted, said reactor means after substantially all of said fingers have been so contacted exerting a substantially immovable reactive force against all of said fingers collectively in the then individual rearward movement positions of each of said fingers to cause said fingers collectively to strip said article.
Claim 5
Dependent Claim
90 words
In a stripping device as defined in claim 1 in which said reactor means includes a pre-set volume of liquid forced into relatively free flow by each of said fingers during said individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge, said free flowing of said liquid being blocked after substantially all of said fingers have been so contacted and exerting a substantially immovable reactive force against all of said fingers collectively to cause said fingers collectively to strip said article.
Claim 6
Dependent Claim
107 words
In a stripping device as defined in claim 1 in which said reactor means includes a piston operably connected to and movable with each of said fingers, each of said pistons reacting against a pre-set volume of liquid and exerting said minimum reacting force against each of said fingers rearwardly from contact of that finger by said article leading edge by relatively free flow of said liquid, said free flow of said liquid being blocked after substantially all of said fingers have been so contacted to exert a substantially immovable reactive force against all of said fingers collectively to cause said fingers collectively to strip said article.
Claim 7
Dependent Claim
105 words
In a stripping device as defined in claim 1 in which said reactor means includes a positivE bottoming liquid collector operably connected receiving a portion of a pre-set volume of liquid reacting in free flow as forced by each of said fingers during said individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge, said collector bottoming after substantially all of said fingers have been so contacted blocking said liquid free flow and exerting a substantially immovable reactive force through said liquid against all of said fingers collectively to cause said fingers collectively to strip said article.
Claim 8
Dependent Claim
127 words
In a stripping device as defined in claim 1 in which said reactor means includes a piston operably connected to and movable with each of said fingers, a positive bottoming liquid collector, a pre-set volume of liquid between each of said pistons and said collector, said collector receiving a substantially free flow of a portion of said liquid during said individual movement of each of said fingers rearwardly from contact of that finger by said article leading edge through reaction against said liquid by said pistons, said collector bottoming after substantially all of said fingers have been so contacted and exerting a substantially immovable reactive force against all of said fingers collectively by blocking said liquid free flow to cause said fingers collectively to strip said article.
Claim 9
Dependent Claim
66 words
In a stripping device as defined in claim 1 in which said reactor means includes pressure fluid assist means operably connected for exerting a positive pressure force upon said exerting of said substantially immovable reactive force to exert an additional positive force against each of said fingers urging said fingers toward said pre-set maximum forward positions to thereby assist said fingers in collectively stripping said article.
Claim 10
Dependent Claim
34 words
In a stripping device as defined in claim 1 in which said reactor means includes pressure detector means operable for detecting said reactor means exertion of said substantially immovable reactive force against said fingers.
Claim 11
Dependent Claim
35 words
In a stripping device as defined in claim 1 in which said reactor means includes electrical probe means operable for electrically signalling said reactor means exertion of said substantially immovable reactive force against said fingers.
Claim 12
Dependent Claim
209 words
In a stripping device of the type wherein frame means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: a cylinder on said frame means for each of said fingers and having a generally axially reciprocal piston forwardly operably connected to that finger, each piston being individually rearwardly movable in its cylinder from a normally urged pre-set maximum forward position by engagement of its finger by said article leading edge during movement of said article thereagainst for said stripping; a positive bottoming liquid collector connected in flow communication with each of said cylinders rearwardly of said piston having operating means therein movable between a normally urged minimum liquid accepting non-actuated position and a maximum liquid accepting bottoming position, said operating means in said bottoming position positively resisting entrance of further liquid into said collector; a total pre-set volume of liquid completely filling all of said cylinders rearwardly of said pistons with all of said pistons in said maximum forward positions and said collector in said non-actuated position and said flow communication between said cylinders and collector.
Claim 13
Dependent Claim
209 words
In a stripping device of the type wherein frame means mounts a multiplicity of circumferentially adjacent fingers about an axially reciprocal ram movable therethrough with said fingers engaging a leading edge of a tubular article on said ram and stripping said article from said ram during said ram movement; the improvements comprising: a cylinder on said frame means for each of said fingers and having a generally axially reciprocal piston forwardly operably connected to that finger, each piston being individually rearwardly movable in its cylinder from a normally urged pre-set maximum forward position by engagement of its finger by said article leading edge during movement of said article thereagainst for said stripping; a positive bottoming liquid collector connected in flow communication with each of said cylinders rearwardly of said piston having operating means therein movable between a normally urged minimum liquid accepting non-actuated position and a maximum liquid accepting bottoming position, said operating means in said bottoming position positively resisting entrance of further liquid into said collector; a total pre-set volume of liquid completely filling all of said cylinders rearwardly of said pistons with all of said pistons in said maximum forward positions and said collector in said non-actuated position and said flow communication between said cylinders and collector.
Claim 14
Dependent Claim
40 words
In a stripping device as defined in claim 9 in which said flow communication between said collector and said cylinders includes a common header connected in flow communication with said collector and each of said cylinders rearward of said piston.
Claim 15
Dependent Claim
114 words
In a stripping device as defined in claim 9 in which said collector includes a Cylinder having an operating piston therein movable between said normally urged minimum liquid accepting bottoming position, said piston being moved from said non-actuated position to said bottoming position by the flow of said liquid into said cylinder as a result of said finger pistons being moved rearwardly in their cylinders by engagement of said fingers by said article leading edge, said collector piston upon moving to said bottoming position resisting entrance of further liquid into said collector and creating an immovable reactive force through said liquid to said finger pistons to cause said fingers collectively to strip said article.
Claim 16
Dependent Claim
183 words
In a stripping device as defined in claim 9 in which said collector includes a cylinder having an operating piston therein movable between said normally urged minimum liquid accepting non-actuated position and a maximum liquid accepting bottoming position, said piston being moved from said non-actuated position to said bottoming position by the flow of said liquid into said cylinder as a result of said finger pistons being moved rearwardly in their cylinders by engagement of said fingers by said article leading edge, said collector piston upon moving to said bottoming position resisting entrance of further liquid into said collector and creating an immovable reactive force through said liquid to said finger pistons to cause said fingers collectively to strip said article, compressable means in said collector cylinder tending to urge said operating piston to said non-actuated position and said liquid from said collector cylinder, said compressable means compressing during movement of said collector operating piston to its bottoming position as forced by said liquid entering said collector cylinder forced by said finger pistons moving rearwardly from said article leading edge engaging said fingers.
Claim 17
Dependent Claim
59 words
In a stripping device as defined in claim 9 in which each of said finger cylinders has a compression spring therein rearwardly of said piston normally tending to urge said piston to said pre-set maximum forward position and compressing rearwardly upon said finger of that piston being engaged by said article leading edge during movement of said article thereagainst.
Claim 18
Dependent Claim
71 words
In a stripping device as defined in claim 9 in which said collector includes assist means actionable upon said operating means reaching said bottoming position for exerting a positive force against said operating means tending to move said operating means back toward said non-actuated position, said assist means positive force being transmitted through said liquid and said finger pistons to said fingers tending to assist said fingers in said article stripping.
Claim 19
Dependent Claim
25 words
In a stripping device as defined in claim 9 in which pressure detector means is operably connected for sensing positive pressure exerted by said liquid.
Claim 20
Dependent Claim
36 words
In a stripping device as defined in claim 9 in which electrical sensing means is operably connected to said collector for sensing and producing an electrical signal upon said collector operating means reaching said bottoming position.
Claim 21
Dependent Claim
22 words
In a stripping device as defined in claim 9 in which said pistons in said finger cylinders are generally spherical in configuration.
Claim 22
Dependent Claim
37 words
In a stripping device as defined in claim 9 in which said pistons in said finger cylinders are generally spherical in configuration and have said fingers secured thereto and movable therewith in both reciprocal and pivotal movement.
Claim 23
Dependent Claim
138 words
In a method of stripping a tubular article from an axially moving ram by engaging a leading edge of said article by a multiplicity of circumferentially adjacent fingers; the steps of: normally urging said fingers forwardly each to a pre-set forward position ready for individual finger engagement by said article leading edge; individually engaging said fingers by said article leading edge dependent on the particular contour of said article leading edge; permitting relatively free individual rearward movement of said fingers upon engagEment by said article leading edge; after substantially all of said fingers have been contacted by said article leading edge, positively stopping rearward movement of each of said fingers in its then rearward position determined by movement and contour of said article leading edge stripping said article from said ram during continued axial movement of said ram.
Claim 24
Dependent Claim
138 words
In a method of stripping a tubular article from an axially moving ram by engaging a leading edge of said article by a multiplicity of circumferentially adjacent fingers; the steps of: normally urging said fingers forwardly each to a pre-set forward position ready for individual finger engagement by said article leading edge; individually engaging said fingers by said article leading edge dependent on the particular contour of said article leading edge; permitting relatively free individual rearward movement of said fingers upon engagEment by said article leading edge; after substantially all of said fingers have been contacted by said article leading edge, positively stopping rearward movement of each of said fingers in its then rearward position determined by movement and contour of said article leading edge stripping said article from said ram during continued axial movement of said ram.
Claim 25
Dependent Claim
72 words
In a method of stripping as defined in claim 19 including the further step of after said positively stopping rearward movement of each of said fingers in its then rearward position, positively urging said fingers forwardly toward their pre-set forward positions while maintaining each finger in the same position relative to the other fingers to further aid in stripping said article from said ram during said continued axial movement of said ram.
Claim 26
Dependent Claim
96 words
In a method of stripping as defined in claim 19 in which said step of permitting relatively free individual rearward movement of said fingers includes the backing of said fingers by a liquid with said finger rearward movement causing a relatively free liquid flow; and in which said step of positively stopping rearward movement of each of said fingers includes the blocking of said liquid flow causing a positive reactive force against said fingers and said fingers against said article leading edge to strip said article from said ram during continued axial movement of said ram.
Claim 27
Dependent Claim
127 words
In a method of stripping as defined in claim 19 in which said step of permitting relatively free individual rearward movement of said fingers includes the backing of said fingers by a pre-set volume of liquid and permitting relatively free flow of said liquid into a liquid collector as urged by said individual rearward movement of said fingers caused by said engagement by said article leading edge; and in which said step of positively stopping rearward movement of each of said fingers includes the bottoming of said liquid collector stopping flow of said liquid and creating a reactive force through said liquid to positively stop rearward movement of each of said fingers and thereby strip said article from said ram during continued axial movement of said ram.
Claim 28
Dependent Claim
107 words
In a method of stripping as defined in claim 19 in which said step of permitting relatively free individual rearward movement of said fingers includes the backing of each of said fingers with a separate relatively freely rearwardly movable piston and moving each finger and its piston rearwardly as urged by engagement by said article leading edge; and in which said step of positively stopping rearward movement of each of said fingers includes the positive stopping of rearward movement of each of said pistons with said piston reacting against and stopping its finger thereby stripping said article from said ram during continued axial movement of said ram.
Claim 29
Dependent Claim
164 words
In a method of stripping as defined in claim 19 in which said step of permitting relatively free individual rearward movement of said fingers includes the backing of each of said fingers with a separate relatively freely rearwardly movable piston and backing all of said finger pistons with a preset volume of liquid relatively freely flowable into a movable liquid collector, said liquid flowing into said movable liquid collector upon urging against said liquid by said rearward movement of said finger pistons caused by finger rearward movement upon engagement by said article leading edge; and in which said step of positively stopping rearward movement of each of said fingers includes the bottoming of said movable liquid collector positively terminating the flow of said liquid into said collector to create a reactive force through said liquid and said finger pistons stopping rearward movement of each of said finger pistons and fingers thereby stripping said article from said ram during continued axial movement of said ram.
Claim 30
Dependent Claim
141 words
In a method of stripping as defined in claim 19 in which said step of permitting relatively free individual rearward movement of said fingers includEs the backing of said fingers by a pre-set volume of liquid and permitting relatively free floww of said liquid into a liquid collector as urged by said individual rearward movement of said fingers caused by said engagement by said article leading edge; in which said step of positively stopping rearward movement of each of said fingers includes the bottoming of said liquid collector stopping flow of said liquid and creating a reactive force through said liquid to positively stop rearward movement of each of said fingers and thereby strip said article from said ram during continued axial movement of said ram; and in which said method includes the step of electrically detecting said liquid collector bottoming.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |