Abstract: The combination of an index table journaled upon a support upon a vertical axis and a computer controlled hydraulic drive including a hydraulic motor connected to the index table. A manifold is mounted upon the support and has a pressurized hydraulic chamber with a hydraulic accumulator mounted upon the manifold in communication with its chamber. A hydraulic power supply is connected to the manifold for pressurizing the accumulator at a pre-set level. An electro-hydraulic proportional valve having a power connector and a hydraulic directional control valve has an intake connected to the accumulator and a pair of outlet feed conduits connected to the hydraulic motor for selectively receiving pressurized hydraulic fluid from the proportional valve for feeding the motor at a predetermined flow, rate and duration for controlled rotational speed, acceleration and duration of incremental rotation of the motor and index table.

Abstract: In a crank press having a pedestal and a rotatable crank shaft journaled thereon and connected to a reciprocal top platen guidably mounted on the pedestal to form work pieces, the improvement which comprises a hydraulic motor mounted on the pedestal having a reversible drive shaft connected to the crank shaft, and a hydraulic transmission connected to the hydraulic motor. The transmission includes a pump assembly connected to a reservoir for delivering the pressure fluid selectively under the control of a servo directional valve in a closed hydraulic loop to the hydraulic motor for selective forward and reverse drive together with a safety control to automatically neutralize the pump assembly and control automatic braking of the hydraulic motor drive shaft.

Abstract: The vacuum indicator has a body with an attachment shank having a fluid passage. A cylinder bore is located in the body and communicates with the passage. An end plug having a bore and a counterbore is threaded into the body. The bore of the end plug terminates at the inner end in a first annular flat abutment surface which faces one end of the body. The counterbore terminates in a second annular flat abutment surface which is located between the inner and outer ends of the plug and forms one end of the plug bore. A piston is nested in the cylinder bore and has a piston rod secured thereto, with the piston rod projecting axially through and outwardly of the end plug. An annular bearing element is located in the plug bore and surrounds the piston rod. The piston has an annular end surface facing the first abutment surface. A compression spring is interposed at its ends between one end of the cylinder bore and the piston and yieldably biases the piston towards the first abutment surface.

Abstract: The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located at one end of the body and communicates with the passage. An end plug having a bore and a counterbore is threaded into the body. The bore terminates at the plug inner end in a first annular flat abutment surface. The counterbore terminates in a second annular flat abutment surface which is located between the inner and outer ends of the plug and forms one end of the plug bore. A piston is nested in the cylinder bore having a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards one end of the cylinder bore. The piston is variably movable longitudinally against the spring on application of pressure to the pressure fluid passage.

Abstract: The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located in the body and communicates with the passage. An end plug having a bore and a counterbore is threaded into the body. A piston is nested in the cylinder bore and has a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards the fluid passage against the pressurized fluid. The improvement resides in the provision of a backup bushing nested within the plug bore which axially and guidably receives the piston rod. A cylindrical slide seal of a permanently lubricated material is nested within the plug bore and projects into and depends from the bushing in sealing engagement with the piston rod.

Abstract: The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located at one end of the body communicating with the passage and has a threaded open end. An end plug having a bore and a counterbore is snugly threaded into the open end. A piston is nested in the cylinder bore and has a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards said one end of the cylinder bore. The piston is variably movable longitudinally against the spring on application of pressure to the shank passage. A bearing or bushing is nested within the plug bore and axially and guidably receives the piston rod.

Abstract: The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located at one end of the body communicating with the passage and has a threaded open end. An end plug having a bore and a counterbore is snugly threaded into the open end. A piston is nested in the cylinder bore and has a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards said one end of the cylinder bore. The piston is variably movable longitudinally against the spring on application of pressure to the shank passage. The improvement resides in the provision of a bushing nested within the plug bore which axially and guidably receives the piston rod. A cylindrical slide seal of plastic material is nested within the plug bore and projects into and depends from the bushing in sealing engagement with the piston rod.