Patent US4861257A successfully refreshed from Google Patents.
US4861257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core structure of molding apparatus
Assignee: Toto Ltd
•
Filing: 1988-06-01
•
Granted: 1989-08-29
•
Expires: 2008-06-01
Abstract
Abstract The core structure of a molding apparatus for making a molded article is disclosed. The cylindrical core which forms a plurality of main core members separated by a plurality of wide slits and a plurality of complementary core members which are inserted and fastened in the slits can be independently manufactured and thereafter assembled. Accordingly, the main core members, without the complementary core plate members being attached, provide sufficiently wide machining or grinding clearance to allow speedy machining or grinding on the side faces of the main core members. The complementary core members, as well, may be machined and ground quite readily and accurately. The cylindrical core members and the complementry core members can be produced in high precision so that the assembling of the members to form a cylindrical core structure also can be carried out precisely or accurately and such core structure can be installed in the molding apparatus precisely. Accordingly, the manufacture of highly precise molded articles becomes possible.
Inventors
- 👤 Masao Siotani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:11
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/44; B29C45/4421; B29C33/00; B29C33/44; B29C33/48; B29C33/485; B29L; B29L2031/00; B29L2031/56; B29L2031/565; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A core structure for a molding apparatus comprising: (a) a generally cylindical core having a core body and a radially movable resilient part, the resilient part being longitudinally divided into plural arcuate segments spaced apart to define slots therebetween, (b) a plurality of elongated, arcuate complementary core members corresponding in external shape to said slots and fittable into said slots to form a cylinder with said segments, an end of each of said members being fixed to said generally cylindrical core, and (c) a core-expanding rod, which is insertable into the generally cylindrical core to radially expand the segments and the complementary core members to form a cylindrical smooth surface for molding an article thereupon.
Claim 2
Dependent Claim
115 words
A core structure for a molding apparatus comprising: (a) a generally cylindical core having a core body and a radially movable resilient part, the resilient part being longitudinally divided into plural arcuate segments spaced apart to define slots therebetween, (b) a plurality of elongated, arcuate complementary core members corresponding in external shape to said slots and fittable into said slots to form a cylinder with said segments, an end of each of said members being fixed to said generally cylindrical core, and (c) a core-expanding rod, which is insertable into the generally cylindrical core to radially expand the segments and the complementary core members to form a cylindrical smooth surface for molding an article thereupon.
Claim 3
Dependent Claim
69 words
A core structure of a molding apparatus according to claim 1, wherein the complementary core members are provided with a plurality of insert protrusions which are removably inserted into a plurality of inserting openings formed on the peripheral wall of the cylindrical core body of the cylindrical core and a cylindrical stopper is concentrically inserted in the cylindrical core body to hold the inserting protrusions in the inserting openings.
Claim 4
Dependent Claim
37 words
A core structure of a molding apparatus according to claim 1, wherein the complementary core members have the proximal ends thereof fixedly connected to the cylindrical core body of the cylindrical core by means of fastening bolts.
Claim 5
Dependent Claim
31 words
A core structure of a molding apparatus according to claim 1, wherein the complementary core members have the proximal ends thereof welded to the cylindrical core body of the cylindrical core.
Claim 6
Dependent Claim
51 words
A core structure of a molding apparatus according to claim 1, wherein the complementary core members have the proximal ends thereof continuously and integrally connected to a cylindrical base member and the cylindrical base member is concentrically disposed in and fixedly secured to the cylindrical core body of the cylindrical core.
Claim 7
Dependent Claim
37 words
A core structure of a molding apparatus according to claim 5, wherein the cylindrical base member is concentrically disposed in and fixedly secured to the cylindrical core body of the cylindrical core by means of fastening bolts.
References Cited (Backward Citations)
US292167A
Cited
US2403147A
Cited
US2394503A
Cited
US2890490A
Cited
US3018518A
Cited
US3228678A
Cited
US3420537A
Cited
US3482815A
Cited
US3549158A
Cited
US4130264A
Cited
US4392899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |