Patent US3848496A successfully refreshed from Google Patents.
US3848496A
Expired / Lapsed
US
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Die and spring assemblies having particular application to stripper plates
Assignee: Dayton Progress Corp
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Filing: 1973-01-15
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Granted: 1974-11-19
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Expires: 1993-01-15
Abstract
Abstract A die for use in a punch press or like equipment embodying improvements in the mount and suspension of a spring biased stripper plate. It features stripper springs endowed with a definite pre-load by virtue of a special cage assembly. The caged spring assemblies are so constructed and applied that there is absolutely no pressure on the stripper plate when the die is in an open position. In preferred embodiments of the caged spring assemblies, the open spaces between the coils of a contained spring are reduced to a dimension less than that of the thickness of the coils themselves. This prevents the coils from winding or screwing and from materially affecting the prescribed pre-load in event of spring breakage. The invention further features means to maintain the stripper spring preload constant and to preserve a constant relation of component parts of the die when adjustment of the die tools is required.
Inventors
- 👤 H Stevens
- 👤 A Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:32
CPC Classifications
B; B21; B21D; B21D45/00; B21D45/003; B21D45/006; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/2144; Y10T83/215; Y10T83/2155; Y10T83/2159
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
221 words
In a die for use in a punch press or like equipment including a first die means providing a first die shoe to which is secured a tool retainer, a second die means providing a second die shoe to which is fixed a die plate, stripper plate means interposed between said die means and normally displaced from and mounted for movement to and from said tool retainer, work being accomplished by the die in movement of one of said die means relative the other between an open position of the die in which said tool retainer and stripper plate are displaced from each other and from said die plate and a closed position in which work is performed by tools mounted by said tool retainer, and biasing means positioned between said first die means and said stripper plate, said biasing means including compressible spring means and a cage-like housing therefor, said housing basing on said stripper plate and having a relatively reciprocable relation to said first die means and there being means responsive to relative motion of said die means in a closing movement of the die to compress said spring means independently of said housing, expansion of said spring means responsive to relative motion of said die means in an opening movement of the die being limited by said housing.
Claim 2
Dependent Claim
221 words
In a die for use in a punch press or like equipment including a first die means providing a first die shoe to which is secured a tool retainer, a second die means providing a second die shoe to which is fixed a die plate, stripper plate means interposed between said die means and normally displaced from and mounted for movement to and from said tool retainer, work being accomplished by the die in movement of one of said die means relative the other between an open position of the die in which said tool retainer and stripper plate are displaced from each other and from said die plate and a closed position in which work is performed by tools mounted by said tool retainer, and biasing means positioned between said first die means and said stripper plate, said biasing means including compressible spring means and a cage-like housing therefor, said housing basing on said stripper plate and having a relatively reciprocable relation to said first die means and there being means responsive to relative motion of said die means in a closing movement of the die to compress said spring means independently of said housing, expansion of said spring means responsive to relative motion of said die means in an opening movement of the die being limited by said housing.
Claim 3
Dependent Claim
39 words
Apparatus as in claim 1 characterized by said means to compress said spring means including means positioning, at least in part, internally of the spring means and projecting from said housing to be contacted by said first die means.
Claim 4
Dependent Claim
49 words
Apparatus as in claim 2 wherein said means positioning, at least in part, internally of said spring means has a pin-like form and provides a base for maintaining the line of said spring means and said cage-like housing is arranged also to maintain the line of said spring means.
Claim 5
Dependent Claim
62 words
Apparatus as in claim 1 characterized by stripper plate mounting means including screwlike connectors suspending said stripper plate means from said first die means around the body of each of which connectors is a sleeve the length of which is governed in dimension by the desired distance between said stripper plate and said tool retainer in the open position of the die.
Claim 6
Dependent Claim
82 words
Apparatus as in claim 4 characterized by said sleeve having means at one end thereof positioning normally, in the open position of the die, on the surface of said tool retainer which is remote from the stripper plate while the body of the sleeve is adapted to project from said tool retainer to abut the surface of the stripper plate mOst adjacent the tool retainer, said sleeve being axially displaceable in reference to said tool retainer on the closing of said die.
Claim 7
Dependent Claim
44 words
Apparatus as in claim 5 wherein said sleeve provides means readily adjusted as to its length to accommodate an adjustment in the spacing between said stripper plate and said tool retainer while maintaining the described position thereof in the open position of the die.
Claim 8
Dependent Claim
24 words
Apparatus as in claim 1 characterized by said cage-like housing limiting the axial length of said spring means and establishing thereby a required pre-load.
Claim 9
Dependent Claim
39 words
Apparatus as in claim 7 characterized by said cage-like housing having turned over ends containing said spring means and means within one of its turned over ends to prevent full axial expansion of said spring means within said cage.
Claim 10
Dependent Claim
39 words
Apparatus as in claim 8 characterized by a pin like plunger inserted within said spring means, which is coiled thereabout within said cage-like housing, having said means preventing said full axial expansion of said spring means in connection therewith.
Claim 11
Dependent Claim
52 words
Apparatus as in claim 9 characterized by said plunger having an extension normally projected in a recess in said first die means aligned with the related spring means and having the projected extremity of said extension normally spaced from the bottom of said recess when the die is in its open position.
Claim 12
Dependent Claim
72 words
Apparatus as in claim 10 characterized by said plunger extension providing means for adjustment of the assembly thereof with said spring means and the said cage therefore to readily accommodate the sharpening or adjustment or replacement of tools mounted to said tool retainer so as to maintain the pre-load condition established for said spring means to inhibit an application of stress to said stripper plate in the open position of the die.
Claim 13
Dependent Claim
71 words
Die apparatus according to claim 1, characterized by stripper plate mounting means including hanger means guiding said stripper plate in relative approaching and separating motions with respect to said tool retainer of said first die means in opening and closing of the die and limiting relative separating motion, said hanger means including screw means to effect service adjustments in the projected position of said stripper plate relative to said tool retainer.
Claim 14
Dependent Claim
90 words
Apparatus according to claim 1, wherein said cage-like housing presents an outer end portion to said first die means and confines said spring means between said outer end portion and an inner end portion based on said stripper plate means, said means to compress said spring means including a free floating plunger having a portion interposing between said spring means and said outer end portion of said housing, another portion of said plunger projecting from said outer end portion of said housing to be contacted by said first die means.
Claim 15
Dependent Claim
196 words
In a die for use in a punch press or like equipment providing opposing first and second die means movable in relative approaching and separating motions to die closed and die open positions and providing an interposing stripper plate means, hanger means placing said stripper plate means in a connected relation to said first die means and limiting relative projection of the plate toward said second die means, means comprised in said hanger means to select a projected position of said stripper plate and to retract said plate relatively to said first die means to establish and maintain an operating position of said stripper plate irrespective of service adjustments, spring means for biasing said stripper plate to a projected position, cage means containing said spring means to establish a predetermined compression thereof which relieves said stripper plate of pressure thereon in an open position of the die while establishing and maintaining a pre-load condition of said spring means, and means, forming a reducible axial extension of said spring means and projecting beyond one end of said cage means, for obviating increases in the pre-load of said spring means in differenT retracted positions of said stripper plate.
Claim 16
Dependent Claim
196 words
In a die for use in a punch press or like equipment providing opposing first and second die means movable in relative approaching and separating motions to die closed and die open positions and providing an interposing stripper plate means, hanger means placing said stripper plate means in a connected relation to said first die means and limiting relative projection of the plate toward said second die means, means comprised in said hanger means to select a projected position of said stripper plate and to retract said plate relatively to said first die means to establish and maintain an operating position of said stripper plate irrespective of service adjustments, spring means for biasing said stripper plate to a projected position, cage means containing said spring means to establish a predetermined compression thereof which relieves said stripper plate of pressure thereon in an open position of the die while establishing and maintaining a pre-load condition of said spring means, and means, forming a reducible axial extension of said spring means and projecting beyond one end of said cage means, for obviating increases in the pre-load of said spring means in differenT retracted positions of said stripper plate.
References Cited (Backward Citations)
US2579641A
Cited
US3418839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |