US PATENT SUBCLASS 474 / 101
MEANS FOR ADJUSTING BELT TENSION OR FOR SHIFTING BELT, PULLEY OR GUIDE ROLL

Current as of: June, 1999
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474 /   HD   ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS

101MEANS FOR ADJUSTING BELT TENSION OR FOR SHIFTING BELT, PULLEY OR GUIDE ROLL {11}
102  DF  .~> With sensor for controlling operation of shifter to correct belt training deviation {3}
109  DF  .~> Load responsive tension adjuster or shifter
110  DF  .~> Tension adjuster or shifter driven by electrical or fluid motor
111  DF  .~> Tension adjuster has surface in sliding contact with belt
112  DF  .~> Pulley or guide roll has eccentric mount for shifting or tensioning movement
113  DF  .~> Pulley shifter {4}
119  DF  .~> Belt shifter for shifting belt laterally or for selective engagement and supported disengagement of belt with pulley {4}
131  DF  .~> Guide roll forms belt-thickness gap with pulley
132  DF  .~> Gravity actuated guide roll for tensioning belt
133  DF  .~> Guide roll mounted for movement of its axis along arcuate path to tension belt {2}
136  DF  .~> Guide roll mounted for movement of its axis along rectilineal path to tension belt {2}

DEFINITION

Classification: 474/101

MEANS FOR ADJUSTING BELT TENSION OR FOR SHIFTING BELT, PULLEY, OR GUIDE ROLL:

(under the class definition) Subject matter wherein the significance is attributed to: (a) a member other than a pulley* engageable with a belt*, and which is adjustable or relatively movable with respect to the belt in a direction which causes an increase or decrease in tensile stress in the belt or a take-up or any undesirable belt slack to maintain a desirable drive traction between the belt and pulley drive

face; or (b) a device or structure for providing relative movement between a belt and pulley, to remove the belt from the pulley, to affect the extent of the drive traction between the belt and pulley, or to correct any deviation of the belt from a centered path of travel on the pulley.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5, and 75, for devices for altering belt tension associated with forward and reverse drives or variable speed drives.

SEE OR SEARCH CLASS

19, Textiles: Fiber Preparation,

250+, for tensioning a fiber drafting apron.

30, Cutlery, 385, for means to adjust a guide pulley in a chain saw.

57, Textiles: Spinning, Twisting, and Twining,

105, for a tensioner for a driving band.

83, Cutting,

814+, for means to tension an endless band or chain cutting device.

105, Railway Rolling Stock,

105+, for a belt tightener in a wheel or axle drive.

162, Paper Making and Fiber Liberation,

273, for means to maintain tension in an endless forming surface.

180, Motor Vehicles,

231, for tensioning a drive belt for a motor-driven two-wheeled vehicle and subclasses 351, 357, 366, and 373 for belt drives in vehicles that may include tensioning.

187, Elevator, Industrial Lift Truck, or Stationary Lift for Vehicle, 264+, for means for raising or lowering an elevator car which includes a car supporting cable and separate means engaging and maintaining the tension of the cable.

198, Conveyors: Power-Driven,

813+, for a tension adjuster for a conveyor belt; and see a listing of other areas of search following the definition of Class 198, subclass 813.

211, Supports: Racks,

119.02, for an endless cable clothesline including supporting and tightening structure.

226, Advancing Material of Indeterminate Length, appropriate subclasses for a material tensioner associated with such material handling.

242, Winding, Tensioning, or Guiding,

410+, and 147+ for a tensioning device associated with winding, unwinding, or in general use for a running length of indefinite-length material.

248, Supports,

646+, for a support for a movable machine wherein adjustability may provide a belt-tensioning feature.

318, Electricity: Motive Power Systems, 6+, for control of tension in material being driven.

322, Electricity: Single Generator Systems,

43, for control of belt slippage in a power generating mechanism.

433, Dentistry,

111, for belt tensioner in an endless belt driving system for a dental apparatus.

451, Abrading,

311, for a tightener for an abrading band. [figure]