Patent ID: 7654372

Claim:
A shoe-hold apparatus for a drum brake device, comprising: (1) a shoe-hold spring including a first arm or a web side arm arranged on a drum side surface of a web of a brake shoe, which is mounted on a back plate at an opposite side of the back plate, a second arm or a drum side arm arranged to face the first arm, and a curved connecting portion jointing the first and second arms, the first arm has a one end opened first slot and said second arm has a one end opened second slot at their ends respectively; and (2) a shoe-hold pin including a first head that is non-passable through a pin-insertion hole formed in the back plate, a shaft continuing from the first head and passable through the pin-insertion hole, and a second head continuing from the shaft and passable through the pin-insertion hole, said shoe-hold spring is resiliently retained between the second head and the web by penetrating the second head and shaft through the pin-insertion hole of the back plate to engage the first head with the back plate and sliding the shoe-hold spring on the drum side surface of the web from a crossing direction with an axis of the shoe-hold pin while the second head and a part of the shaft are projecting from the drum side surface of the web so that the shoe-hold pin can be passed through the pair of said first and second slots, wherein said shoe-hold spring has a pin-insertion portion continuing from said first slot in said first arm and said shaft of the shoe-hold pin has (1) a penetrating portion that is passable through said first and second slots and (2) a disengagement preventive portion that is non-passable through said first slot of the first arm and is configured so that a predetermined portion thereof is allowed to be positioned in said pin insertion portion, said disengagement preventive portion has a length that is projected from said drum side surface of the web mounted on the back plate while said shoe-hold pin is engaging with said back plate; and said length that is projected from said drum side surface of the web is determined so as to restrict a lateral movement of the shoe-hold spring along said web and a rotational movement of the shoe-hold spring with said second head as the fulcrum when said disengagement preventive portion of the shoe-hold pin is positioned within the pin-insertion portion of the first arm.