Abstract:
A pneumatic metal forming press which employs at least one pneumatic drive unit which has an expansion chamber defined by a flexible diaphragm acting on a support mechanism and a shock absorber underlying the support mechanism to absorb the impact thereof following the release of a working tool such as a punch after penetration of a work piece during a working stroke. The drive unit may incorporate a plurality of diaphragm chambers arranged one above the other and connected in parallel to a source of high pressure air. The drive unit may also incorporate a pressure multiplier having a fluid chamber pressurized in response to movement of the diaphragm of a drive mechanism and an output drive shaft driven in response to pressure thereto by the fluid in the multiplier chamber. The drive mechanism may also incorporate a secondary drive mechanism operable to locate the working tool closely adjacent a work piece prior to commencement of the working stroke so that although the press may have a short working stroke, it has the ability to open and close over a substantial operating stroke.
Abstract:
An improved hydraulic press, comprising a base frame with an horizontal bed, to which two stationary heads, termed "fore head" and "rear head", respectively, are firmly secured, said heads being connected with one another by at least two cylindrical, parallel columns, whereon a movable positioning and pre-compression crosshead, operated by hydraulic jacks, is slidingly fitted, whereby to act on a movable punch, located opposite to a stationary die, acting both punch and die, on the recess of a bottom mold; being the pressure on the movable punch, working on the recess of the bottom mold, being exerted through a pad made of an elastically flexible material, interposed between said crosshead and said fore head, it being possible to have said pad filled with a pressurized liquid.
Abstract:
A pressure actuator is provided having a stationary plate and a floating plate for holding an element under compression and a base plate separated from said floating plate by a flexible conduit which defines an inner chamber intermediate said floating and base plates. The conduit is comprised of at least one solid member or track, usually two, which defines an enclosure or ring. Depending on the number of tracks one or two elastomeric bands are employed. The edges of the elastomeric band(s) fit into grooves in the tracks to form a continuous conduit, which has a port for pressurizing. With the continuous conduit intermediate the floating and base plates, a significant portion of the surface of the elastomeric sheet or sheets is in contact with the plates. When a work product is introduced between the stationary and floating plates, the conduit is pressurized with a fluid, defining an hermetically sealed chamber which is also pressurized, at a pressure lower than the pressure in the conduit, to provide a uniform work force against the work product. The pressure actuator finds particular use in pressure applications which require high, uniform force to be applied to the work. When the element is to be released, the pressure in the chamber and conduit is released, lowering the element out of engagement with the upper restraining plate.
Abstract:
A press device, as for instance for the binding of the bevelled ends of a conveyor belt by means of an adhesive, comprises two platens, cross-members of U-shaped cross-section on the outer side of each platen, with the U of each cross-member opening towards the corresponding platen, means to connect the protruding ends of the cross-members of one platen with the protruding ends of the cross-members of the other platen, and inflatable hoses disposed in the U''s of the cross-members to urge the platens towards each other. The hoses are preferably of the type comprising reinforcing plies of fabric.
Abstract:
The disclosure herein is of a means of molding, primarily directed to the art of urethane or similar plastic molding wherein pressures are relatively low and the time and pressure cycle is relatively short, involving the provision of a conveyor upon which press members are supported in which the molds are in turn positioned, the presses being connected to a central source of air pressure which is maintained during the molding cycle, making possible the continuation of the connection during such cycle whereby pressure may be maintained therein, the presses moving from a loading to an unloading position and returning within a minimum area, the presses in turn being of simple, compact construction whereby to reduce the total cost of the mechanism, with added efficiency and control being provided.