| 摘要 |
355,058. Moulding caps for electric lamps and valves. BRITISH THOMSONHOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Severance, S. W. ; 653, North Street, and Kessler, J. W. ; 17, Hazelwood Terrace, both in Pittsfield, Massachusetts, U.S.A.) Sept. 11, 1930, No. 27158. Convention date, Sept. 11, 1929. [Class 87 (ii).] A moulded cap for a valve or lamp is produced in a multi-section mould by providing each contact pin with a head of over-size dimension, compressing the head between two sections of mould so as to reduce it to proper dimensions, and moulding the cap about the pins. As shown in Fig. 2, the head 5 of each contact pin 2 is formed with a conical top and with two flanges 7, the upper one of which is knurled. The pins are inserted in recesses 10 in a lower mould section 9 which is forced against an upper mould section 12 so that the conical heads are flattened and the lower flanges are forced into recesses in the section 9. The section 9 and an outer cylindrical section 15, which surrounds it loosely and rests on a platform 14, are lowered, moulding material such as phenolic condensation product is inserted and the sections raised so as to mould the material about the contacts, the mould being heated during this operation by the passage of steam through conduits 18 ; excess material is forced out at the top as shown in Fig. 5. The section 9 is again lowered, the outer section 15 being held by an obstruction, not shown, and the cap is removed by inserting knock-out pins in the recesses 10. The operations of flattening the heads and moulding may be carried out simultaneously. A number of caps may be made in a multiple mould. |
