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公开(公告)号：BE749849A
公开(公告)日：1970-10-01
申请号：BE749849D
申请日：1970-04-30
Applicant: IBM
Inventor： CORNACK W L BUEHNER D L GREERR , O'BRIAN P L , SIMPSON H W
Abstract: 1282693 Typewriters INTERNATIONAL BUSINESS MACHINES CORP 8 May 1970 [2 June 1969] 22257/70 Heading B6F A sound-deadening device for typewriters comprises a cavity member 50 which together with an enclosure 19 and a backing member 29 defines ingress and egress slots 33, 35 for paper passing around a platen 13, the cavity member 50 being sound absorbing. As shown, the cavity 50 comprises a housing enclosing members 117, 118, 119, 120 of polyurethane foam, the outer members 117, 120 comprising acoustic slot filters. Alternatively, the cavity 50 may be open and lined with sound absorbent material.
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公开(公告)号：CA918814A
公开(公告)日：1973-01-09
申请号：CA71478
申请日：1970-01-06
Applicant: IBM
Inventor： O'BRIAN P L , SHATTUCK D C , CARDWELL W R , LOWRY DENIS E , JOHNSON L E
IPC: H05K7/14
Abstract: 1,224,970. Circuit board assemblies. INTERNATIONAL BUSINESS MACHINES CORP. 12 Jan., 1970 [16 Jan., 1969], No. 1357/70. Heading HlR. The invention, a ventilated circuit board assembly for mounting in a machine frame, comprises circuit boards (glass epoxy laminated structure) 17, 19, and frame members 11, 13, 15 (thermosetting filled phenolic resin) secured in a stack so that the circuit boards are trapped by the resilient members 43 on the end frames 11, 15 and abutments 45 on the inside frame 15 thus providing location (pins 63, 64 and holes 65, 66) and vibration damped support for the circuit boards. Rubber cushioning members 41 which may be replaced by dome-shaped rubber bumpers on projections 43 are provided. The circuit boards carry connecting shrouds 53, 75 on the connector projections 73 to effect interconnection and external connection (Figs. 2 and 3, not shown). Additional circuit boards and frame members may be included and ventilation is by convection in the channels formed by the abutment and resilient members.
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