Abstract: A breakthrough buffer for a mechanical press (1) includes at least one buffer body (20) disposed between punch slide (2) and lower press frame (7) to cushion punch plate (3) during breakthrough of punch (4) through a workpiece, a timing regulator (40, 70, 90) connected to each buffer body for regulating timing of buffering during breakthrough, and a control system (60) to provide a command signal to this regulator to minimize noise or vibration occurring during the breakthrough. The control system includes a controller (63) which is responsive to the output of noise sensor (61) or vibration sensor (65) during breakthrough. The buffer body can include fluid driven buffer piston (22) in a buffer cylinder (21), with the buffer piston being associated with a guidepost (5). Alternatively, the buffer body can include piston (82) which contacts the guidepost and which is fluid driven (30, 81) in opposition to spring (83).

Abstract: A press machine having side frames which are effectively reinforced so as to appreciably reduce the noise generated during operation of the machine and improve the working accuracy of the machine without installing any special device on the outside thereof, significantly increasing the weight of the entire press machine, or obstructing a space between the side frames of the press machine. The side frames of the press machine are C-shaped in side view and are reinforced by at least one reinforcing member fixedly secured to each of the side frames at at least one predetermined place. The reinforcing members function to suppress the deformation of the opening of the C-shaped side frames to reduce noise and improve accuracy. The reinforcing members convert the vibrational energy of the side frames into heat energy which is then absorbed into the side frames.

Abstract: A press machine having side frames which are effectively reinforced so as to appreciably reduce the noise generated during operation of the machine and improve the working accuracy of the machine without installing any special device on the outside thereof or significantly increasing the weight of the entire press machine. The side frames of the press machine which are C-shaped in side view, are reinforced by at least one reinforcing member fixedly secured to each of the side frames at at least one predetermined place. The reinforcing members function to suppress the deformation of the opening of the C-shaped side frames to reduce noise and improve accuracy.

Abstract: In a fluid periodic pressure wave motion attenuating hose in which an inner tube thereof serving as a main conduit portion is coaxially mounted in the hose so as to form an annular space portion between an inner peripheral surface of the hose and an outer peripheral surface of the inner tube, which annular space portion serves as a side-branch portion and is partially communicated with the above main conduit portion of the hose at a predetermined position, the opposite end portions of the inner tube are fixed to a pair of couplings connected with opposite fluid ducts so as to positively define the above side-branch portion against the main conduit portion of the hose and so as to surely support the inner tube. In addition, the inner tube may be constructed of a wire-like spring member and a strip-like metallic member both coiled together to axially alternate in parallel to each other in a close-contact manner, while relaxed in its close-contact at the above predetermined position.

Abstract: A centrifugal fan is disposed within a chamber encircled in part by a radiator assembly with the centrifugal fan being effective for creating an air flow outwardly through radiator cores. The radiator assembly comprises a first tank, a second tank and a plurality of tube-like cores interconnecting the first and second tanks.