# US 4,377,121 A · Bobbin case

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- Number: US 4,377,121 A
- Document ID: US4377121A
- Status: Granted
- Kind: A
- Application number: 06/245,043
- Filed: 1981-03-18
- Granted: 1983-03-22
- Earliest claimed: 1980-03-28
- Assignees: Aisin Seiki Kabushiki Kaisha
- Inventors: Shunichi Teranishi
- Web page: https://patentgrep.com/patent/US4377121A

## CPC

- D05B 57/265: {for looptakers with vertical axis}
- D05B: SEWING (appliances for the tailoring trade A41H; sewing tables A47B29/00; sewing in bookbinding B42B2/00; sewing machines modified for knitting D04B39/08)

## Abstract

A bobbin case for a shuttle having a rotary hook in which a plurality of pins for connecting an upper portion made of metal and a lower portion made of plastic are flexibly connected to the lower portion such that the pins may be slightly inclined upon contact between the upper portion and the pins due to vibrations transmitted from the rotary hook to the upper portion, thereby preventing generation of noise.

## Claims

### Claim 1

A bobbin case for a shuttle around which a rotary hook is rotated, said bobbin case comprising:
an upper portion made of metal having a plurality of holes formed therein, each of said holes forming a stepped portion therein,
a plurality of pins respectively mounted in said holes,
each of said pins further comprising at an upper end portion and a lower end portion thereof, respectively, a head and a key,
opposite ends of said key projecting from said lower end portion,
a plurality of springs respectively being positioned adjacent said pins,
each of said springs being compressed between said head and said stepped portion of each of said holes and
a plastic lower portion having a plurality of holes formed therein corresponding to said holes of said upper portion, respectively,
each of said holes of said lower portion including a first portion allowing vertical movement of said pin with said key against said spring, a second portion allowing rotation of said pin with said key therein, and a stepped portion formed between said first portion and said second portion, said stepped portion of said lower portion engaging said key after rotation of said pin.

### Claim 2 (depends on 1)

A bobbin case according to claim 1, said head of said pin having a radial groove formed therein.

### Claim 3 (depends on 1)

A bobbin case according to claim 1, said stepped portion of said lower portion further comprising a pair of opposed seats forming grooves for receiving, respectively, opposite ends of said key.