| 摘要 |
<p>998,424. Hydrostatic firing devices. PNEUMODYNAMICS CORPORATION. Nov. 20, 1963 [Jan. 10, 1963], No. 45828/63. Heading F3A. [Also in Division B7] The explosive charge 70 in an embedment anchor 10 (see Division B7) is ignited by a resistance element 72 which is controlled by two switches, a hydrostatic pressure switch 110 and a contact pressure switch 94. When the anchor is first lowered, both switches are open. When a predetermined depth has been reached contact 110b closes on terminals 110d and 110e, whereby a circuit is established through element 72, contact 110a, terminal 110d, contact 110b, terminal 110e, contact 110f and wire 110g, the latter leading to one terminal of switch 94. Until the anchor strikes the sea bed, switch 94 remains open relative to batteries 86 such that line 110g is earthed through contacts 94a, 94b and 94c. When the anchor strikes bottom contact 94b closes on terminals 94d, 94e whereby current flows from the batteries through contacts 94f, 94e, 94b, 94d and 94a to wire 110g, whereby current is conducted to resistance element 72 which ignites the explosive and drives the anchor nose cone 48 into the sea bed.</p> |
