Positive seal for batteries employing plastic casings
Methods and apparatus for positive displacement bonding and, more particularly, for automatically forming, on a continuous, reproducible basis, fusion bonds devoid of structural, electrical, and cosmetic defects between two or more workpieces are described. By moving a heated electrode into the area to be bonded so as to heat and melt uniformly the portions of the workpieces to be bonded while, at the same time, displacing substantially all of the molten material from the area to be bonded into a storage area or reservoir surrounding the heated electrode where such molten material is maintained in its uniformly heated molten state, and then retracting the electrode so as to permit the molten material to return to the cavity formed by the electrode in the workpieces where such molten material is allowed to cool and solidify, a flawless bond between the workpieces is formed. Improved sealing means are also used. Thermal or fusion bonds are made in accordance with the methods of the invention and with the apparatus of the invention by a combination of elevated temperature levels sufficient to melt the material to be bonded and displacement of the molten material, as contrasted with more conventional techniques and/or apparatus, which combine elevated temperature levels and pressure. 17 figures (auth)
- Assignee:
- Gould Inc.
- Patent Number(s):
- US 3909300
- OSTI ID:
- 5001652
- Resource Relation:
- Patent File Date: Filed date 21 Jan 1974
- Country of Publication:
- United States
- Language:
- English
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