# US 11,992,983 B2 · Method of manufacturing resin retainer having two annular sections

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- Number: US 11,992,983 B2
- Document ID: US11992983B2
- Status: Granted
- Kind: B2
- Application number: 17/754,195
- Filed: 2020-06-29
- Published: 2022-09-22
- Granted: 2024-05-28
- Earliest claimed: 2019-10-08
- Assignees: Nakanishi Metal Works Co., Ltd.
- Applicants: Nakanishi Metal Works Co., Ltd.
- Inventors: Shinya Takagiwa; Osamu Fukuda
- Web page: https://patentgrep.com/patent/US11992983B2

## CPC

- B29C 45/0416: {co-operating with fixed mould halves}
- B29C 45/1742: {Mounting of moulds; Mould supports (mounting of exchangeable mould inserts B29C45/2675)}
- B29C 45/2628: {with mould parts forming holes in or through the moulded article, e.g. for bearing cages}
- B29C 45/33: having transversely, e.g. radially, movable mould parts
- B29C 45/401: {Ejector pin constructions or mountings}
- F16C 19/163: {with angular contact}
- F16C 19/26: with a single row of rollers
- F16C 33/38: Ball cages
- F16C 33/3856: {made from plastic, e.g. injection moulded window cages}
- F16C 33/46: Cages for rollers or needles
- F16C 33/4635: {made from plastic, e.g. injection moulded window cages}
- B29L 2031/04: Bearings
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

Provided is a method of manufacturing a resin retainer having two annular sections. A fixed-side cavity forming mold has a first axial mold surface that is in contact with an axial end surface of a first annular section of the annular sections of a resin retainer having two annular sections, and a first protruding portion protruding from the first axial mold surface. A movable-side cavity forming mold has a second axial mold surface that is in contact with an axial end surface of a second annular section of the annular sections of the resin retainer, and a second protruding portion protruding from the second axial mold surface. A slide core sliding step is performed in which slide cores are slid toward an outer diameter and pocket-forming protruding portions of the slide cores are extracted from a pocket of the retainer, and then a mold opening step is performed in which the movable-side cavity forming mold is opened relative to the fixed-side cavity forming mold.

## Claims

### Claim 1

A method of manufacturing a resin retainer having two annular sections, by injection molding,
the retainer having a shape in which annular sections in pair, which are separated from each other in an axial direction, are connected by a plurality of columns provided in a circumferential direction of the annular sections at an equal interval,
the injection molding being performed using an injection molding die that includes:
a fixed-side cavity forming mold;
a movable-side cavity forming mold; and
slide cores,
the fixed-side cavity forming mold having: a first axial mold surface that is in contact with an axial end surface of a first annular section of the annular sections of the retainer; and a first protruding portion protruding from the first axial mold surface,
the movable-side cavity forming mold having: a second axial mold surface that is in contact with an axial end surface of a second annular section of the annular sections of the retainer; and a second protruding portion protruding from the second axial mold surface,
one of the fixed-side cavity forming mold and the movable-side cavity forming mold having an inner periphery molding surface that is in contact with an inner peripheral surface of the retainer, and
each of the slide cores, which has: an outer periphery molding surface that is in contact with an outer peripheral surface of the retainer; and a pocket-forming protruding portion for forming a pocket between the columns adjacent to each other,
the method comprising:
a molten resin material charging step of charging a molten resin material in a cavity of the injection molding die for molding the resin retainer, after the fixed-side cavity forming mold, the movable-side cavity forming mold, and the slide core are closed and clamped;
a molten resin material cooling step of cooling and solidifying the molten resin material that has been charged in the cavity in the molten resin material charging step;
a slide core sliding step of sliding the slide cores in a radially outward direction to extract the pocket-forming protruding portions of the slide cores from the pockets of the resin retainer in a state where a parting surface between the fixed-side cavity forming mold and the movable-side cavity forming mold is not opened, after the molten resin material charging step and the molten resin material cooling step are performed;
a mold opening step of opening the parting surface by moving the movable-side cavity forming mold relative to the fixed-side cavity forming mold, after the slide core sliding step is performed; and
a molded article taking-out step of taking the resin retainer molded in the cavity of the injection molding die out from the injection molding die, after the mold opening step is performed.

### Claim 2 (depends on 1)

The method of manufacturing a resin retainer having two annular sections, according to claim 1, wherein
the first protruding portion of the fixed-side cavity forming mold and the second protruding portion of the movable-side cavity forming mold are provided to interpose therebetween each of the columns of the retainer.

### Claim 3 (depends on 1)

The method of manufacturing a resin retainer having two annular sections, according to claim 1, wherein
the second protruding portion of the movable-side cavity forming mold is a distal end portion of an ejector pin for pushing a molded article in the molded article taking-out step, the ejector pin being provided in the movable-side cavity forming mold.

### Claim 4 (depends on 1)

The method of manufacturing a resin retainer having two annular sections, according to claim 1, wherein
the injection molding die includes a fixed-side main body and a movable-side main body, and an angular pin is provided in the fixed-side main body or the movable-side main body, the angular pin being inserted in an angular pin insertion hole provided in the slide core, and
the injection molding die includes a connection mechanism that allows the movable-side cavity forming mold to be opened relative to the fixed-side cavity forming mold, after the pocket-forming protruding portions of the slide cores are extracted from the pockets of the retainer.