Abstract: A hollow housing is provided including a top wall defining at least one upwardly opening new blade magazine receiving recess therein and a vertical slot therethrough. The housing top wall further includes a pivoted cam lever closely adjacent the slot and by which a surgical blade releasably mounted from a surgical blade support shank may be stationarily clamped relative to the top wall to enable one handed manipulation of the support shank in a manner to disengage the latter from the surgical blade.

Abstract: A rolling tourniquet is provided including releasably connected ends. The tourniquet is longitudinally elastic, flexible and circular in cross section. Further, the tourniquet is highly resistant to radial deformation and the releasably connected ends include releasably joined end connecting members which may be quickly releasably jointed together against separation and quickly disconnected, when desired.

Abstract: A pop-up sprinkler is provided with a control valve for sealing a sprinkler housing against water inflow to prevent leakage or drainage therethrough unless the pressure in a water supply line reaches or exceeds a predetermined level sufficient to move a spring-biased pop-up stem rapidly to an elevated spraying position. The control valve comprises a relatively small valve plug at the bottom of the pop-up stem and encircled by a seal ring for sealing engagement with a valve seat when water pressure is low to close a water inlet at the bottom of the sprinkler housing. In a preferred form wherein the housing is formed by a molding or casting process, the valve seat is defined by the inner diameter surface of an annular flange upstanding from a bottom wall of the housing and having a substantially uniform thickness for solidification with little or no valve seat heat deformation or distortion.