Abstract: A motorized blower assembly (1) is provided for use in respiratory therapy applications. The active motor sub-assemblies (6, 7, 9) are encapsulated within an over-molded thermoplastic material (5) with selected vibration-dissipative and thermally-conductive properties. The resulting blower assembly operates at reduced sound levels of 1.0-3.0 dB, and with an increased efficiency of 3-9% over currently-marketed blowers of similar size and air flow capability.

Abstract: A resurfaceable rotary die counter is prepared by employing a cylindrical counter core having a central, circumferentially extending relieved area filled with readily replaceable synthetic resin material containing pre-tensioned, spirally wound glass fiber roving which renders the resin craze and crack resistance even under extended continuous use. Economical counter production is possible because of preparation of the counter on the press during makeready using the die as a counter forming element. The resin is run in against the die prior to hardening of the same to form a reverse design surface in the counter which exactly mates with the die surfaces. A viscous resin having a minimum viscosity of about 6000 cps. is employed which has the characteristics of remaining on the counter core without substantial flow until ultraviolet cure can be effected.