| 摘要 |
1396901 Dry cell casing UNION CARBIDE CORP 8 Aug 1972 [9 Aug 1971] 37030/72 Heading H1B A resealable venting means for a dry cell comprises a resilient cover 20 having an annular flange 26 bearing on the rounded over upper portion 28 of cell container 10. As shown cover 20 has a further flange 22 forming a close fit with carbon cathode collector rod 14 and an intermediate annular projecting portion 24 has a circumferential notch 30 engaged by the rim of container 10 but permitting gas accumulating in 18 to pass and be vented by the flapper valve constituted by flange 26 and the rounded container surface. Cover 20 is held in place by metal cap 36 secured to the cell jacket 34, the arrangement permitting escape of the vented gases. In an alternative embodiment (Fig. 3, not shown) the engaging surfaces of the container and notch 30 may be sealed with grease, passages being provided through cover 20 to the venting means, or non-sealed regions being left. A liquid-absorbing washer may be provided in space 18 to trap electrolyte (Fig. 5, not shown). Container 20, e.g. of zinc, may have a shrunkon film tubing applied thereto. |
