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US 4,382,172 AGranted
Method for fabricating a watch case
AssigneeCitizen Watch Co., Ltd.
InventorsTsuneji Takasugi, Seiji Umezawa
Life of this patent
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Abstract
A method for fabricating a watch case comprising the steps of placing contact points of a bezel and a watch body to face to each other, applying pressure to said contact points through electrodes, and applying pulse current to said electrodes until said contact points get molten. The pulse current will allow the bezel and the body except the contact points to cool down during its intervals. Therefore, this method does not require a water-cooling system as required by conventional methods.
Claims7
A method for fabricating a watch case comprising the steps of:
- placing contact points of a bezel and a watch body to face each other;
- applying pressure to said bezel and watch body by means of electrodes;
- and
- applying pulse current including heating periods for heating said contact points and cooling periods for cooling said bezel and watch body of the heat transmitted from said contact points to said electrodes until said contact points get molten to form a joint.
1 more element
Dependencies are inferred from the claim text.