The invention relates to a ram comprising a piston rod in two parts mounted for relative rotation. A first part extends out of the cylinder, beyond each of the heads, while the second part extends out of the cylinder only beyond one head, namely the upper one, and comprises two axial shoulders directed in opposite directions, located at the two ends of this second part and each cooperating with a ...

A pleated paper filter element has the configuration of the frustrum of a cone with the pleats extending lengthwise of the sloping wall of the cone and has pleat separation dimples embossed into the paper from which the element is made, the height of said dimples being graduated lengthwise of the element so as to provide controlled pleat separation over at least most of the length of the element.

A sound-wave receiving applicance comprises a resonance panel and a crystal type piezoelectric microphone responsive to oscillations generated by the soundwaves, said microphone being adapted for connection to an amplifier. The crystal of the microphone is subjected, between two pole members, to a mechanical initial pressure to increase the pressure sensitivity of the microphone relative to the re...

PURPOSE:To enable early finding of the abnormality of cutting tool by obtaining the cutting vibration at first time band and other time band after start of cutting. CONSTITUTION:First area power in specified frequency band of cutting vibration in first time band after start of cutting is obtained while second area power in specific frequency band of cutting vibration in second time band different ...

A digital conference circuit for a digital telephone switching network is provided, connected between a receive TDM (time division multiplex) bus carrying PCM (pulse code modulation) words from the conferees to the conference circuit and a transmit TDM bus carrying PCM words from the conference circuit to the conferees. For a conference involving N conferees, N-1 shift registers serially interconn...

A membrane in the form of a flat film, tubular film or hollow filament of synthetic polymers which has from 10 to 90%, by volume, of intercommunicating pores and a smooth surface comprising open pores, the proportion of openings in the surface amounting to from 10 to 90%, is produced by a process which comprises extruding a homogeneous mixture of at least two components, one component being a fusi...

A mixture comprising at least two components of which one is a fusible polymer and the other is a liquid which is inert towards the polymer, the two components being such as to form a binary system having in the liquid state, a region in which they are totally miscible and a region in which there is a discontinuity in mixing, is extruded at above the critical temperature of the binary system into ...