# US 5,348,515 A · Sprocket wear indicator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,348,515 A - Document ID: US5348515A - Status: Granted - Kind: A - Application number: 08/003,742 - Filed: 1993-01-13 - Granted: 1994-09-20 - Earliest claimed: 1993-01-13 - Assignees: Case Corporation - Inventors: Larry E. Miller - Web page: https://patentgrep.com/patent/US5348515A ## CPC - F16H 55/30: Chain-wheels - B62D 55/12: Arrangement, location, or adaptation of driving sprockets - Y10S 474/901: Pulley or guide roll for track of endless track vehicle - F16H: GEARING - 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) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A wear indicator for a sprocket adapted to have an endless track arranged in driving association therewith. The sprocket has opposite side surfaces and a series of sprocket teeth disposed peripherally about the sprocket. Each sprocket tooth has a tip with track engaging surfaces extending away therefrom to define a tooth profile. The sprocket wear indicator includes a visual marker on a side surface of the sprocket for allowing a person to visually gauge wear of the tooth profile on the sprocket. ## Claims ### Claim 1 A sprocket comprised of a body with opposite side surfaces and a series of equally spaced teeth about an outer surface thereof between the side surfaces, each tooth comprising a tip with opposite flanks extending radially from said tip toward a root to define a tooth profile, and an indicator provided on at least one of said side surfaces at a predetermined distance from a relatively wornless tooth profile of least one of said sprocket teeth to provide a visual indication of wear of the sprocket teeth. ### Claim 2 (depends on 1) The sprocket according to claim 1 where said indicator is formed as a recess on the side surface of said body and generally parallels the relatively wornless tooth profile on the sprocket. ### Claim 3 A sprocket for an implement with an endless track adapted for driving association with said sprocket, said sprocket having an axis of rotation, opposite side surfaces, and a series of teeth disposed peripherally about said sprocket in equally spaced relation about said axis of rotation, each sprocket tooth having a tip and track contacting surfaces extending between tips of adjacent sprocket teeth, said sprocket further including a visual marker on a side surface of said sprocket for allowing a person to visually gauge wear of the track contacting surfaces of the toothed sprocket. ### Claim 4 (depends on 3) The sprocket according to claim 3 wherein said visual marker includes a formation on the side surface of the sprocket, said marker formation being initially spaced inwardly a predetermined distance from a wornless track contacting surface of at least one sprocket tooth. ### Claim 5 (depends on 3) The sprocket according to claim 3 wherein said visual marker includes an annular formation on the side surface of the sprocket, said annular formation being initially spaced inwardly a predetermined distance from and generally parallels wornless track contacting surfaces extending about the sprocket. ### Claim 6 (depends on 3) The sprocket according to claim 3 wherein said visual marker includes a formation on the side surface of the sprocket, said marker formation being initially spaced inwardly a predetermined distance from a wornless track contacting surface of at least one sprocket tooth. ### Claim 7 A sprocket for an implement with an endless track entrained in driving engagement with said sprocket, said endless track including a plurality of like sections articulately interconnected to each other by trackpins and bushings, said sprocket having opposite side faces and circumferentially adjacent teeth arranged to engage said bushings of said track whereby driving the track, each sprocket tooth having a tip with track engaging surfaces extending away therefrom to define a tooth profile, and wherein said sprocket further includes a wear indicator on a side surface thereof for visually indicating sprocket tooth wear, said wear indicator including a visual marker disposed a predetermined distance inwardly from the tooth profile of at least one sprocket tooth to indicate that replacement of the sprocket is required when the tooth profile is worn proximate to the marker. ### Claim 8 (depends on 7) The sprocket according to claim 7 wherein said visual marker comprises a continuous groove extending about the side face of the sprocket and that generally parallels a wornless tooth profile on the sprocket. ### Claim 9 (depends on 7) The sprocket according to claim 7 wherein said visual marker includes a formation extending at least partially about the side surface of the sprocket.