MODEL ENGINE STARTER

• US 20050211216A1
• Filed: 06/08/2004
• Published: 09/29/2005
• Est. Priority Date: 03/26/2004
• Status: Active Grant

• Current Assignee: Kyosha Company Limited
• Original Assignee: Kyosha Company Limited
• Inventors: Otsuki, Naohiko
• Granted Patent: US 6,968,821 B2
• Time in Patent Office: Days
• US Class Current: 123/185.300
• CPC Class Codes: F02B 75/34 Ultra-small engines, e.g. for driving models
• CPC Class Codes: F02D 2400/06 Small engines with electronic control, e.g. for hand held tools
• CPC Class Codes: F02N 15/022 the starter comprising an intermediate clutch
• CPC Class Codes: F02N 3/02 having pull-cords
• CPC Class Codes: Y10T 74/134 Clutch connection

Abstract

A model engine starter assembly is provided which is capable of quickly relieving the engagement between the actuator and the coupling pin upon the start of the model engine and includes a starter shaft which carries a starter pin and defines a shaft axis, and a hub provided with a guide groove which is slanted at a predetermined angle with respect to the shaft axis. The hub has a bore in which a rearward end portion of the starter shaft is inserted for rotational movement relative to the hub. The starter pin is received within the slanted groove so as to move the starter shaft in the direction of the shaft axis in response to rotation of the shaft axis relative to the hub to thereby move an actuator attached to a forward end of the starter shaft into and out of engagement with a connecting pin of the model engine'"'"'s crank shaft. The slanted groove is defined by a front guide face which terminates at an open end of the guide groove, a rear guide face opposed to the front guide face, and a transition face which extends between the rear guide face and the open end of the guide groove.

Claims

1. A starter assembly for a model engine which is adapted to engage a coupling pin on a crankshaft of the model engine, the starter assembly comprising

a starter shaft carrying a starter pin and having forward and rearward end portions defining therebetween a shaft axis;

a hub having a bore in which said forward end portion of the starter shaft is received to allow for rotation of the starter shaft relative to the hub, and a guide groove which is slanted at a predetermined angle with respect to the shaft axis, and

an actuator attached to said rearward end portion of the starter shaft which is adapted to being brought into and out of engagement with the coupling pin of the model engine crankshaft, wherein

said guide groove includes an open proximal end and a closed distal end and is defined by opposed front and rear guide faces each of which is slanted at said predetermined angle relative to the shaft axis, wherein

said guide groove further includes a transition face which is parallel to the starter axis and is joined to said rear guide face and extends toward said proximal open end of the guide groove, wherein said front guide face terminates at said open end of the guide groove, and the rear guide face terminates at the transition face, and wherein

said starter pin carried by said starter shaft is received within said guide groove so as to be moveable therewithin along a said front and rear guide faces in response to rotation of the starter shaft relative to the hub so as to responsively move the starter shaft in a direction of the shaft axis and thereby move the actuator into and out of engagement with the coupling pin of the model engine crankshaft.

3. A starter assembly for a model engine as set forth in claim 1, wherein said starter shaft is formed with a D-shaped cutout, and wherein said starter assembly further comprises:

a rotary drive mechanism operatively connected to the starter shaft so as to impart rotational force to the starter shaft;

a ball slidably in contact with the a circumferential face inclusive of said D-shaped cutout of said starter shaft, and

a bias member for urging said ball to the circumferential face inclusive of said D-shaped cutout of said starter shaft to prevent said hub and said starter shaft from rotating together in the absence of resistance being imparted to said drive section.

4. A starter assembly for a model engine as set forth in claim 1, wherein said actuator includes an arm adapted to engage with the coupling pin of the model engine crankshaft.

5. A starter assembly for a model engine as set forth in claim 1, further comprising a rotary drive mechanism operatively connected to the starter shaft so as to impart rotational force to the starter shaft, wherein said rotary drive mechanism comprises a rotary member, is composed of a starter rope to rotate said rotary body, and a return spring having an urging force stored up to rewind said starter rope about the circumference of said rotary member when said starter rope is drawn out.

6. A starter assembly for a model engine starter as set forth in claim 1, further comprising a rotary drive mechanism operatively connected to the starter shaft so as to impart rotational force to the starter shaft, wherein said rotary drive mechanism comprises a rotary member, a motors and a transmission mechanism to transmit a turning force of said motor to said rotary member.

2. (canceled)