Drum brake device with single shoe extension device
AssigneeNisshinbo Industries, Inc.
InventorsTakashi Ikeda, Seiji Asai
Life of this patent
Estimating the term…
Abstract
A drum brake device is provided in which a single shoe extension device activated by the service brake can yield a braking force equivalent to that of a two leading (2L) type of drum brake device, and which facilitates the incorporation of a parking brake device and an automatic shoe clearance adjustment device. A link (10) is pivoted on an anchor pin (2), the central segment of the link (10) is engaged with the one brake shoe (4), a shoe clearance adjuster (14) is mounted between the link (10) and the other brake shoe (5) between the other pair of adjacent ends of the two brake shoes, wherein braking force can be mutually transferred between the two brake shoes (4, 5) by means of the link (10) and the shoe clearance adjuster (14).
Claims20
A drum brake device comprising:
- a back plate;
- two facing brake shoes on top of said back plate, each shoe having a shoe web;
- an anchor pin mounted on said back plate and engaged by one pair of adjacent ends of said two facing brake shoes;
- a primary shoe extension device mounted on said back plate in the vicinity of said anchor pin and positioned between the one pair of adjacent ends of said brake shoes which spreads open said adjacent ends of both brake shoes when activated by a service brake;
- a link provided adjacent the shoe web of the one brake shoe having one end pivotable on said anchor pin, and a central segment of said link functionally engaged with said one shoe web;
- and
- means provided between the other pair of adjacent ends of the two facing brake shoes connecting said link and the other brake shoe for mutually transferring a braking force between the two facing brake shoes.
A drum brake device comprising:
- back plate;
- two facing brake shoes on top of said back plate, each shoe having a shoe web;
- an anchor pin mounted on said back plate and set between one pair of adjacent ends of said two facing brake shoes, one end of one brake shoe being pivotally mounted to turn on said anchor pin, a semicircular arc segment on the one end of the other brake shoe being pivotally engaged on the anchor pin;
- a primary shoe extension device mounted on said back plate in the vicinity of said anchor pin and positioned between the one pair of adjacent ends of said brake shoes which spreads open one end of the other brake shoe and one end of said link when activated by a service brake;
- a link provided adjacent the shoe web of the one brake shoe having a central segment of said link functionally engaged with said one shoe web;
- and
- means provided between the other pair of adjacent ends of the two facing brake shoes connecting said link and the other brake shoe for mutually transferring a braking force between the two facing brake shoes.
Dependencies are inferred from the claim text.