HEADING 91.14 - OTHER CLOCK OR WATCH PARTS.
178 COMMODITIES
9114.10 - Springs including hair-springs
9114.20 - Jewels
9114.30 - Dials
9114.40 - Plates and bridges
9114.90 - Other
This heading covers all clock or watch parts other than :
(a)Parts excluded by Chapter Note 1 :
(1) Weights clock or watch glasses watch chains ball bearings and bearing balls (e.g. for self-winding watches).
(2) Parts of general use as defined in Note 2 to Section XV e.g. screws (bridge crown dial ratchet click end-stone cap or index disc yoke setting lever etc.) taper pins clock chains figures for dials of base metal (Section XV) or similar goods of plastics (CHAPTER39) or of precious metal or of metal clad with precious metal (generally heading 71.15).
These parts are classified in their own appropriate headings. However clock and watch springs (mainsprings hairsprings etc.) remain in this heading.
(b)Parts specifically included in other headings of this Chapter (e.g. the complete and assembled movements of heading 91.08 or 91.09 the movement sets incomplete watch or clock movements assembled or rough watch or clock movements of heading 91.10 the cases of heading 91.11 or 91.12 and the watch straps watch bands and watch bracelets of heading 91.13).
Except as provided in paragraph (a) or (b) above parts suitable for use both in clocks or watches and in other articles for example in toys meters or measuring or precision instruments (springs trains jewels hands etc.) fall in this heading (see Chapter Note 4). However the heading does not cover parts which are not clearly clock or watch parts (e.g. printing or totalling devices for time-registers and certain other parts used in articles of heading 91.06 or 91.07).
The heading includes identifiable blanks of clock or watch parts but it excludes metal pieces not yet recognisable as clock or watch parts (e.g. plates bridges etc. direct from the lathe or roughly cut to shape without drilling hollowing etc.). These are classified according to their constituent material.
The clock or watch parts of this heading may be unpolished polished nickel-plated rhodium-plated silvered gilded varnished etc. or jewelled.
Subject to the above provisions the principal clock or watch parts classified here are :
(A) PARTS OF WATCH MOVEMENTS
(regardless of complexity of system) These include :
(1) Frame : plate (and any additional plates) bridges (of the barrel centre wheel third wheel fourth wheel balance-wheel (cock) escapement setting wheel etc.).
(2) Driving mechanism : mainspring barrel barrel cover barrel arbor and ratchet click click spring.
(3) Train : centre wheel and pinion third wheel and pinion fourth wheel and pinion.
(4) Motion work : cannon pinion minute wheel pinion and minute wheel hour wheel.
(5) Escapement (anchor or lever pin pallet cylinder detent etc.) : escape wheel and pinions lever pallet staff rollers pallet stones impulse pin cylinder.
(6) Regulating device : balance balance staff hairspring (flat Br‚guet cylindrical) tuning-fork stud collet regulator index stud end-stone cap or index disc regulator spring lower cap jewel end-piece including special parts for shock- proof devices.
(7) Winding and setting mechanism : crown winding stem and pinion clutch wheel setting wheels crown ratchet wheel crown wheel core yoke (rockingbar) setting lever setting lever spring and yoke springs.
(8) Parts of electronic movements : circuits for watches comprising for example an insulating base carrying printed connections and other discrete components formed otherwise than by printing (for example coils capacitors resistors diodes and transistors) possibly together with an integrated circuit.
(9) Platform escapements consist of the plate bridges escapement balance- wheel and hairspring and the regulator of a clock or watch movement with or without train. They remain classified here whether assembled with the escapement regulated or unassembled. Assembled platform escapements may be intended for incorporation in a whole range of appliances using clock or watch movements (time-registers time switches etc.) and sometimes also in small clocks or alarm clocks.
(B) PARTS OF CLOCK OR ALARM CLOCK MOVEMENTS
Many of the parts of these movements are similar in principle to parts of watch movements but are larger. Parts peculiar to clock movements include weight drums pendulums including compensated pendulums (mercury invar stem etc.) crutches verges verge wheels recoil escapements dead-beat (or Graham) escapements etc. independent winding keys. Parts of alarm clock movements include fixed winding keys and knobs for setting.
(C) STRIKING WORK PARTS
(1) Striking work of alarm clocks : stop or detent notched collar release wheel escape wheel index staff pallet striking hammer etc.
(2) Clock striking work (locking plate type rack type etc.) : drum or barrel and barrel wheel locking plate great wheel pin wheel third wheel warning wheel fly detents levers or fly springs repeater rack snail hammer lifting piece arbor fly wheel gathering pallet rack ball gong chimes.
(D) JEWELS
This category includes only worked stones (jewels) i.e. those which have been turned cut polished drilled hollowed etc. or mounted (in a setting or a screw). Unworked or roughly sawn jewels are excluded (CHAPTER71). Watchmakers' jewels are usually extremely small their diameter and thickness rarely exceeding 2 mm and 0.5 mm respectively.
The principal stones used in clock- or watch-making are natural or synthetic rubies sapphires and garnets and occasionally diamonds. In cheap articles glass is sometimes used or the jewels are replaced by metal caps. Clock or watch jewels bear the names of parts which they support e.g. centre wheel jewels third wheel jewels fourth wheel jewels escape wheel jewels pallet staff jewels
and balance-wheel jewels. The bearing of a cylindrical pivot consists of a drilled jewel or of a drilled jewel and a solid jewel (end-stone). There are also bearings consisting of conical cavity jewels.
In addition to round jewels used as bearings clocks and watches with a lever escapement usually also contain three special jewels : two pallet stones (bevelled jewels attached to each end of the pallet) and an impulse pin (a jewel usually of semi- round or triangular section intended for the roller). The jewelling process may be carried out by hand setting by using a mounted jewel or more usually by pressing.
(E) DIALS
Dials generally bear divisions or figures indicating the hours minutes and seconds. They may be flat or curved. They are usually of silvered gilded painted oxidised or otherwise coated brass of enamelled copper of gold or silver or sometimes of paper glass plastics or pottery. The figures and inscriptions are produced by various methods (transfer painting stamping etc.). Dials may have luminous figures or symbols.
Dials are fixed to the plate (or to an additional plate called " dial plate ") by screws pins or an outer ring of metal.
(F) HANDS
These indicate hours minutes and seconds. The heading also covers special hands for chronograph watches and hands for alarm clocks etc. Watch or clock hands may be flat or curved and may be made of steel brass or copper generally polished oxidised nickel-plated chromium-plated silvered gilded or lacquered; they are sometimes of gold and even of bone. Luminous hands have " windows " filled with a compound based on radioactive salts (radio-thorium meso-thorium etc.). There are innumerable types of hands designed to suit the type of dial.
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