US3568555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guidepost construction for die sets
Assignee: Porter Precision Products Co
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Filing: 1968-09-11
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Granted: 1971-03-09
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Expires: 1988-09-11
Abstract
Abstract A die set including upper and lower die shoes respectively mounting a punch and die and a plurality of guideposts interconnecting the upper and lower shoes. The lower die shoe is adapted to be mounted upon a press platen. The upper die shoe carries a backup plate which is adapted to be engaged by the press ram, but is not connected thereto. The upper and lower die shoes are interconnected by a plurality of guidepost assemblies. The guidepost assemblies perform three functions, i.e. they maintain the upper and lower die shoes in alignment, they provide a spring force for opening the die, and they provide a stripping force for stripping the work from the punch member. Each guidepost assembly includes a hollow tube mounted on the upper shoe and a bushing mounted on the lower guide shoe which telescopically receives the tube. A stationary pin extends into the tube and abuts the lower end of a spring, such as a urethane spring member. The urethane spring member is of a configuration smaller than the space in which it is confined when the die is open. Upon closure of the die, the urethane spring member is deformed. When the ram is raised, the urethane member returns to its original shape, forcing the die open and stripping the work from the punch.
Inventors
- 👤 Werner H Stroh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:03
CPC Classifications
B; B21; B21D; B21D37/00; B21D37/10; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/217; Y10T83/2172; Y10T83/869; Y10T83/8776; Y10T83/8785; Y10T83/8788; Y10T83/8821; Y10T83/8855
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
205 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, said lower shoe member being adapted to be mounted upon a bolster plate of a press, said guidepost assemblies holding said punch and die in alignment, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being disposed within said tubular post member, said lower abutment member extending below said lower shoe member and being adapted for engagement with the bolster plate, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge said upper die plate away from said lower die plate, whereby said punch is spaced from said die.
Claim 2
Dependent Claim
205 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, said lower shoe member being adapted to be mounted upon a bolster plate of a press, said guidepost assemblies holding said punch and die in alignment, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being disposed within said tubular post member, said lower abutment member extending below said lower shoe member and being adapted for engagement with the bolster plate, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge said upper die plate away from said lower die plate, whereby said punch is spaced from said die.
Claim 3
Dependent Claim
188 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being disposed within said tubular post member, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge said upper die plate away from said lower die plate, whereby said punch is spaced from said die, a stripper plate carried by said lower die shoe, said spring member being effective to provide a stripping force causing a workpiece to be stripped from said punch.
Claim 4
Dependent Claim
188 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being disposed within said tubular post member, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge said upper die plate away from said lower die plate, whereby said punch is spaced from said die, a stripper plate carried by said lower die shoe, said spring member being effective to provide a stripping force causing a workpiece to be stripped from said punch.
Claim 5
Dependent Claim
187 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being diSposed within said tubular post member, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge upper die plate away from said lower die plate, whereby said punch is spaced from said die, said spring member being formed of urethane and occupying a space smaller than the space within said tube between said upper abutment means and said lower abutment means.
Claim 6
Dependent Claim
187 words
A die set comprising spaced parallel upper and lower shoe members, a punch carried by said upper shoe member, a cooperating die carried by said lower shoe member, a plurality of guidepost assemblies interconnecting said upper shoe member and said lower shoe member, each of said guidepost assemblies comprising a tubular post member carried by said upper shoe member, and a guide bushing carried by said lower shoe member, said guide bushing telescopically engaging the outer periphery of said tubular post member, upper abutment means extending across the upper portion of said tubular post, a lower abutment member immovable with respect to said lower shoe member and being diSposed within said tubular post member, and spring means disposed within said tubular post member in engagement with said lower abutment member and said upper abutment means, said spring means being effective to urge upper die plate away from said lower die plate, whereby said punch is spaced from said die, said spring member being formed of urethane and occupying a space smaller than the space within said tube between said upper abutment means and said lower abutment means.
Claim 7
Dependent Claim
36 words
The die set of claim 2 in which said spring member is formed of urethane and occupies a space smaller than the space within said tube between said upper abutment means and said lower abutment member.
Claim 8
Dependent Claim
20 words
The die set of claim 3 in which said spring comprises a generally cylindrical center section and tapered endwise portions.
Claim 9
Dependent Claim
24 words
The die set of claim 2 in which said spring comprises a urethane member having a generally cylindrical center section and tapered endwise portions
Claim 10
Dependent Claim
26 words
The die set of claim 6 in which said upper abutment means comprises a backup plate secured to the upper surface of said upper shoe member.
Claim 11
Dependent Claim
201 words
A guide bushing for use in dies of the type having spaced upper and lower shoe members, and having a punch secured to said upper shoe member and a die secured to said lower shoe member, said lower shoe member being adapted to be mounted upon a bolster plate of a press, said guidepost assembly comprising a hollow tubular post member secured to said upper shoe member, a guide bushing carried by said lower shoe member and telescopically engaging the periphery of said tubular guide post, and upper abutment member extending across the upper end of said tubular post, a lower abutment member stationary with respect to said lower shoe member, said lower abutment member extending below said lower shoe member and being adapted for engagement with the bolster plate, and a spring disposed interiorly of said hollow guidepost in engagement with said upper abutment means and said lower abutment member, said spring being effective to urge said upper die shoe member away from said lower die shoe member to a position in which said punch is separated from said die, said tubular post and said guide bushing being effective to hold said punch and die in alignment at all times.
Claim 12
Dependent Claim
201 words
A guide bushing for use in dies of the type having spaced upper and lower shoe members, and having a punch secured to said upper shoe member and a die secured to said lower shoe member, said lower shoe member being adapted to be mounted upon a bolster plate of a press, said guidepost assembly comprising a hollow tubular post member secured to said upper shoe member, a guide bushing carried by said lower shoe member and telescopically engaging the periphery of said tubular guide post, and upper abutment member extending across the upper end of said tubular post, a lower abutment member stationary with respect to said lower shoe member, said lower abutment member extending below said lower shoe member and being adapted for engagement with the bolster plate, and a spring disposed interiorly of said hollow guidepost in engagement with said upper abutment means and said lower abutment member, said spring being effective to urge said upper die shoe member away from said lower die shoe member to a position in which said punch is separated from said die, said tubular post and said guide bushing being effective to hold said punch and die in alignment at all times.
Claim 13
Dependent Claim
34 words
The guidepost assembly of claim 8 in which said spring member comprises a urethane member, a guide bushing carried by said lower shoe member and telescopically engaging the periphery of said tubular guide post.
Claim 14
Dependent Claim
68 words
The guidepost assembly of claim 8 in which said spring member comprises a polyurethane member of generally cylindrical cross section at its center portion and having two frustoconical ends, said polyurethane member being deformed when said die is closed and returning to its original configuration when said die is open, a guide bushing carried by said lower shoe member and telescopically engaging the periphery of said tubular guidepost.
Claim 15
Dependent Claim
25 words
The guidepost assembly of claim 10 in which said upper abutment means compresses a backup plate secured to the top of said upper shoe member.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |