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US 4,787,206 AGranted
Hydraulic pressure transducer
AssigneeHerbert Haenchen KG
InventorHans D. Fabrowsky
Life of this patent
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AssigneeHerbert Haenchen KG
InventorHans D. Fabrowsky
Estimating the term…
Hydraulic pressure transducer having an operating cylinder (10) with an operating piston (12) and operating piston rod (14) adapted for rapid traverse, and a transducer piston (22) and piston rod (24) guided within an axially connected power cylinder (20). The transducer piston rod (24) is of a smaller diameter than the operating piston rod (14) and is capable of plunging into the operating cylinder volume (16), the transducer piston rod (24) extending through a seal (58) separating said operating cylinder volume (16) from the power cylinder. In order to avoid repeated overtravel of the high pressure seal separating the traverse fluid inlet from the high pressure volume, a control sleeve (36) is guided on the piston rod (24) of the power cylinder, the control sleeve having a collar (38) near its front end, which is biased towards a stationary plane sealing surface (62) facing the operating cylinder (10) such that during the traverse stroke the control sleeve (36) is removed from the stationary plane sealing surface (42) and thus providing unobstructed admission for traverse stroke pressure fluid to the operating cylinder volume.
A hydraulic pressure transducer having an operating cylinder with an operating piston means adapted for rapid traverse, and a pressure transducer piston means guided within an axially connected power cylinder, the piston rod of which having a cross-section smaller than that of the operating piston and adapted to intrude into the operating cylinder volume and extending through a seal separating the operating cylinder volume from the driven-sided power cylinder volume, and further having a rapid traverse flow fluid inlet adapted for communication with the driving-sided operating cylinder volume, and a power stroke fluid inlet adapted for communication with the driving-sided power cylinder volume, the improvement being characterized in that a control sleeve (36) is sealingly guided on the piston rod (24) of the power cylinder (20), has a collar (38) near its front end adjacent the operating cylinder (10), and with its surface (40) averted from said operating cylinder is biased towards a stationary plane sealing surface (42) and in that the rapid traverse flow inlet (44) opens into an annular space (46) encircling said control sleeve (36), and during the rapid traverse operating mode, when the control sleeve is removed from the stationary sealing surface, is extended as unobstructed admission opening for traverse stroke pressure fluid past said plane sealing surface (42) to the driving-sided operating cylinder volume (16).
A hydraulic transducer having an operating cylinder with an operating piston means adapted for rapid traverse, and a pressure transducer piston means guided within an axially connected power cylinder, the piston rod of which having a cross-section smaller than that of the operating piston and plunging into the operating cylinder volume and extending through a seal separating the operating cylinder volume from the driven-sided power cylinder volume, and further having a traverse stroke fluid inlet communicating with the driving-sided operating cylinder volume, and a power stroke inflow in communication with the driving-sided power cylinder volume, the improvement being characterized in that a control sleeve is sealingly guided on the piston rod of the power cylinder and has a collar near its end adjacent the operating cylinder, at least the end of the collar averted from the operating cylinder or its outer circumference cooperating with a stationary, preferably metallic sealing surface, and in that the traverse stroke inlet opens into an annular space encircling said control sleeve, while said annular space during the traverse stroke operating mode, when the control sleeve is removed from the stationary sealing surface, is extended as unobstructed admission opening for traverse stroke pressure fluid past said sealing surface to the driving-sided operating cylinder volume.
A hydraulic pressure transducer having an operating cylinder;
Dependencies are inferred from the claim text.