Endless synchronous belts, of an outside circumference

40.10 - Conveyor or transmission belts or belting, of vulcanised rubber. - Conveyor belts or belting : 40 10.1 1 - - Reinforced only with metal 4010.12 -- 4010.19 4010.3 1 - - Other - Transmission belts or belting : - - Endless transmission belts of trapezoidal cross-section (V-belts), V-ribbed, 4010.32 - - Endless transmission belts of trapezoidal cross-section (V-belts), other than 4010.33 - - Endless transmission belts of trapezoidal cross-section (V-belts), V-ribbed, Reinforced only with textile materials of an outside circumference exceeding 60 cm but not exceeding 180 cm V-ribbed, of an outside circumference exceeding 60 cm but not exceeding 180 cm of an outside circumference exceeding 180 cm but not exceeding 240 cm 4010.34 - - Endless transmission belts of trapezoidal cross-section (V-belts), other than V-ribbed, of an outside circumference exceeding 180 cm but not exceeding 240 cm 4010.35 - - Endless synchronous belts, of an outside circumference exceeding 60 cm 40 10.36 - - Endless synchronous belts, of an outside circumference exceeding 150 cm but not exceeding 150 cm but not exceeding 198 cm 4010.39 - - Other This headin covers conveyor or transmission belts and belting, who11 of vulcanised rubber, or of textile fa ric impregnated, coated, covered or laminated with rub73er or made from textile yarn or cord impregnated, coated, covered or sheathed with rubber (see Note 8 to this Chapter). It also covers belts or belting of vulcanised rubber reinforced with glass fibre fabric or glass fibres or with cloth of metal wire. f Belts and belting (other than belts or belting wholly of vulcanised rubber) enerally consist of a carcass made up of several layers of fabr~c,whether or not rubberised $e. stnpand which is fabric, knitted or crocheted fabric, layers of parallelised yarns) or of steel cab e orwarp wholly covered with vulcanised rubber. rm, The heading includes belting in the length (for subse uent cutting to length) as well as belts already cut to length (whether or not joined end to en or fitted with fasteners); it also covers endless belts. All these goods may be of rectangular, trapezoidal (V-belts and V-belting), circular or other cross-section. Belts or belting of trayezoidal cross-section are those products having one or more " V " shapes in cross-section. The ' V " surfaces are designed to provide good wed ing action and minimum slippage along the sides of the sheave. The category includes, e.g., elts or belting having a cross-section with : % (A) A single trapezoidal shape (B) Trapezoidal shapes on opposite sides. (C) Two or more trapezoidal shapes on the same side (V-ribbed). %A A V-ribbed belt is an endless belt with a longitudinally ribbed traction surface which engages and grips, by fiction, pulley grooves of similar shape. V-ribbed belts are a type of V-belt. Grooves (whether moulded or cut) in V-belts or belting reduce bending stress and help dissipate the heat from rapid flexing; this is especial1 im ortant on drives where the belts run over small !ongitudinal grooves, have no impact on the sheaves at high s eeds. Grooves, other classification of V- elts or belting. than K Synchronous belts (see illustration) are designed to transmit ower while maintaining a constant rotational relationship between sheaves. The completed pro$uct is often simply referred to as a timing belt. Notches, usually on the inner surface of the belt, are provided to operate smoothly with notched sheaves. Synchronous belts or belting do not have a trapezoidal cross-section. Belts of this heading may be resented in the form of a sleeve (tube) from which finished item can be cut; this presentation oes not affect classification. f Synchronous belt * Conveyor or transmission belts or belting presented with the machines or apparatus for which they are designed, whether or not actually mounted, are to be classified with that machine or apparatus (e.g., Secbon XVI).