# US 8,465,109 B2 · Core bar for rubber crawler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,109 B2 - Document ID: US8465109B2 - Status: Granted - Kind: B2 - Application number: 11/887,475 - Filed: 2005-03-30 - Published: 2010-01-21 - Granted: 2013-06-18 - Earliest claimed: 2005-03-30 - Assignees: Fukuyama Gomu Kogyo Kabushiki Gaisha - Applicants: Hideki Kimura; Satoshi Morishita - Inventors: Hideki Kimura; Satoshi Morishita - Web page: https://patentgrep.com/patent/US8465109B2 ## CPC - B62D 55/244: {Moulded in one piece, with either smooth surfaces or surfaces having projections, e.g. incorporating reinforcing elements} - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract A core bar for a rubber crawler capable of enhancing the durability of the rubber crawler by preventing an end-cutting phenomenon in which cracking is generated at the end of the core bar in a crawler lateral direction of the core bar embedded in the rubber crawler when the rubber crawler rides over a curbstone at the road shoulder of a paved road, stones and obstacles on irregular ground, and is pressed in a lateral direction. In the core bar (1) constituting the rubber crawler (3) and embedded in a rubber crawler body (3a), an enlarged width part (2) is formed by elongating the longitudinal end part of the core bar (1) beyond the width dimension of the core bar. ## Claims ### Claim 1 A core bar for a rubber crawler, wherein the core bar is embedded in a rubber crawler main body of a rubber elastic body, the core bar having a length, a width and a height, and comprising: wing parts each having an external end edge; and enlargement width parts in the wing parts, the core bar having a longitudinal center and a width dimension that lies between the wing parts and the longitudinal center of the core bar, each of the enlargement width parts having a length, a width dimension extended beyond said width dimension of the core bar along the entire length of the enlargement width part, a face partially or wholly sloping toward a tread side of the crawler, and a height equal to the minimum height of the wing part. ### Claim 2 (depends on 1) The core bar according to claim 1, wherein each wing part has an external end edge, and each enlargement width part has a thickness, said thickness being diminished increasingly in a direction from a center of the enlargement width part to the external end edge of the wing part having the enlargement width part. ### Claim 3 A core bar for embedding in a main body of a rubber crawler having a tread side, wherein the main body is made of a rubber elastic body, wherein the core bar has a length, a width, a height, an engagement part for engaging with a driving unit of a traveling device, wing parts extending longitudinally from the engagement part and having enlarged width parts, wherein the core bar has a width dimension that lies between the wing parts and the longitudinal center of the core bar, wherein the enlarged width parts are formed by extending the wing parts of the core bar in the width direction of the core bar to beyond the width dimension of the core bar along the entire length of the enlargement width part, whereby cracks are prevented in the rubber crawler adjacent to the longitudinal end parts, wherein each enlargement width part has a height equal to the minimum height of the wing part, and wherein the enlargement width parts are adapted to be embedded entirely in the main body of a rubber crawler. ### Claim 4 (depends on 3) The core bar according to claim 3, wherein each of the wing parts has an external end edge, and the thickness of each of the enlarged width parts is diminished increasingly in a direction from a center of the enlargement width part to the external end edge to form an inclination facing toward the tread side of the crawler. ### Claim 5 A core bar for embedding in a main body of a rubber crawler having a tread side, wherein the main body is made of a rubber elastic body, wherein the core bar has a length, a width, a height, wing parts, and enlarged width parts, wherein the core bar has a width dimension that lies between the wing parts and the longitudinal center of the core bar, wherein each of the enlarged width parts has an inclination facing a tread side of the crawler and a height equal to the minimum height of the wing part, and wherein the enlarged width parts are formed by extending the wing parts of the core bar in the width direction of the core bar to beyond the width dimension of the core bar along the entire length of the enlargement width part. ### Claim 6 In combination, a rubber crawler and a core bar for embedding in the rubber crawler, wherein the rubber crawler has a rubber elastic main body and a tread side, and wherein the core bar has a length, a width, a height, an engagement part for engaging with a driving unit of a traveling device, wing parts extending longitudinally from the engagement part and having enlarged width parts, wherein the core bar has a width dimension that lies between the wing parts and the longitudinal center of the core bar, wherein the enlarged width parts are formed by extending the wing parts of the core bar in the width direction of the core bar to beyond the width dimension of the core bar along the entire length of the enlargement width part, whereby cracks are prevented in the rubber crawler adjacent to the wing parts, wherein each enlargement width part has a height equal to the minimum height of the wing part, and wherein the enlargement width parts are embedded entirely in the main body of a rubber crawler. ### Claim 7 (depends on 1) The core bar according to claim 1, further comprising an engagement part adjacent to the longitudinal center of the core bar and adapted to engage with a driving unit of a traveling device having a crawler, wherein the enlargement width parts are spaced longitudinally from the engagement part. ### Claim 8 (depends on 3) The core bar according to claim 3, wherein the engagement part is positioned adjacent to the longitudinal center of the core bar, and the enlargement width parts are spaced longitudinally from the engagement part. ### Claim 9 (depends on 5) The core bar according to claim 5, further comprising an engagement part adjacent to the longitudinal center of the core bar and adapted to engage with a driving unit of a traveling device having a crawler, wherein the enlargement width parts are spaced longitudinally from the engagement part. ### Claim 10 (depends on 6) The combination according to claim 6, wherein the engagement part is positioned adjacent to the longitudinal center of the core bar, and the enlargement width parts are spaced longitudinally from the engagement part.