# US 2013/0152896 A1 · Recoil starter mechanism

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- Number: US 2013/0152896 A1
- Document ID: US20130152896A1
- Status: Published application
- Kind: A1
- Application number: 13/716,976
- Filed: 2012-12-17
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Starting Industrial Co., Ltd.
- Inventors: Satoshi Matsui; Taro Kihara
- Web page: https://patentgrep.com/patent/US20130152896A1

## CPC

- F02N 3/02: having pull-cords
- F02N 5/02: of spring type
- F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR

## Abstract

One embodiment provides a recoil starter mechanism, including: a starter case having a rotation shaft; a rope reel rotatably mounted on the rotation shaft; a coil spring wound on the rotation shaft, one end thereof being formed into a tip projecting portion; a hold plate holding the coil spring to the rotation shaft; and a ratchet which is formed into a ring-like shape and interposed between the rope reel and the hold plate. The ratchet includes: a fulcrum around which the ratchet is swingable with respect to the rope reel; a guide groove in which the tip projecting portion is engaged; and an engagement pawl which is to be engaged with an engagement portion of a pulley to thereby start an engine. The guide groove and the engagement pawl are disposed at opposite sides so as to interpose the rotation shaft therebetween.

## Claims

### Claim 1

A recoil starter mechanism, comprising:
a starter case (4);
a rotation shaft (5) which projects from the starter case (4);
a rope reel (6) which is rotatably mounted on the rotation shaft (5);
a coil spring (7) which is wound on the rotation shaft (5), one end of the coil spring (7) being formed into a tip projecting portion (16);
a hold plate (13) which is provided at a tip end portion of the rotation shaft (5) to thereby hold the coil spring (7) toward a base-side portion of the rotation shaft (5); and
a ratchet (17) which is formed into a ring-like shape and interposed between the rope reel (6) and the hold plate (13), the ratchet (17) including:
a fulcrum (18) around which the ratchet (17) is swingable with respect to the rope reel (6);
a guide groove (20) including a first guide portion (20a) extending in a circumferential direction with respect to the rotation shaft (5) and a second guide portion (20b) extending in a radial-outward direction with respect to the rotation shaft (50), the tip projecting portion (16) being engaged with the guide groove (20) with a sliding resistance therebetween; and
an engagement pawl (21) which is to be engaged with an engagement portion (3) of a pulley (1) to thereby start an engine, the guide groove (20) and the engagement pawl (21) being disposed at opposite sides so as to interpose the rotation shaft (5) therebetween.

### Claim 2 (depends on 1)

The mechanism of claim 1,
wherein the length of the first guide portion (20a) is set such that a rotation angle (α) of the rope reel (6) from an initial position to a swinging-start position in which the ratchet (17) starts swinging from the rope reel (6) is equal to substantially 50° or more.

### Claim 3 (depends on 1)

The mechanism of claim 1,
wherein a length of the second guide portion of the guide groove is set such that a rotation angle (β) of the rope reel (6) from a swinging-start position in which the ratchet (17) starts swinging from the rope reel (6) to an engagement position in which the ratchet (17) engages with the pulley is equal to substantially 50° or more.

### Claim 4 (depends on 1)

The mechanism of claim 1,
wherein the engagement portion (3) of the pulley (1) is formed as a recessed groove (3),
wherein a tip end (21a) of the engagement pawl (21) of the ratchet (17) is formed into a rounded portion (21a) having a radius equal to substantially 1/2 of a depth (d) of the recessed groove (3) or more, and
wherein an opening edge (3a) of the recessed groove (3) to be engaged with the engagement pawl (21) of the ratchet (17) is formed into a rounded portion (3a) having a radius equal to substantially ½ of the depth (d) of the recessed groove (3) or more.