Base component for a fluid transfer device and method of making the component

Claim 1

A hydraulic cylinder, comprising: a base member having a first internal passage formed therein for receiving pressurized fluid, said base member composed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; a cylinder member defining a second internal passage formed therein in communication with said first internal passage for receiving pressurized fluid, said cylinder member composed of a plastic material having sufficient inherent strength to withstand said fluid pressure without deformation thereof; attachment means for attaching said base and cylinder members together, said attachment means includes means integral with said cylinder member encapsulating said base member with said plastic material to form a housing thereabout, said housing thickness being substantially less than the thickness of said base member whereby said housing surrounds said base member without being subjected to said internal fluid pressure; and a piston mounted for reciprocal sliding movement within said first internal passage.

Claim 12

A method of making a base component for a fluid transfer device, said transfer device having an inlet, an outlet, a pump chamber and a piston mounted for reciprocation in said chamber to transfer hydraulic fluid from a source to a hydraulically actuatable device, said method comprising the steps of: forming a first base member having a first internal passage for receiving pressurized fluid which subjects said first base member to internal fluid pressure, said first base member formed of a material having a sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; forming a second base member having a second internal passage for receiving pressurized fluid which subjects said second base member to internal fluid pressure, said second base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; encapsulating said base members with a moldable plastic material to attach said first and second base members together with said first and second internal passages in fluid communications with one another, said encapsulation forming a housing about said first base member having a thickness substantially less than the thickness of said first base member whereby said housing surrounds said first base member without being subjected to said internal pressure; and forming simultaneously from said plastic material during said encapsulation a third member integral with said housing and of sufficient inherent strength to withstand a mechanical load applied externally of said base members at a point spaced from said base members so that the application of said mechanical load is transmitted to said first base member.

Claim 13

A method of making a base component for a fluid transfer device, said transfer device having an inlet, an outlet, a pump chamber and a piston mounted for reciprocation in said chamber to transfer hydraulic fluid from a source to a hydraulically actuatable device, said method comprising the steps of: forming a first base member having a first internal passage for receiving pressurized fluid which subjects said first base member to internal fluid pressure, said first base member formed of a material having a sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; forming a second base member having a second internal passage for receiving pressurized fluid which subjects said second base member to internal fluid pressure, said second base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; encapsulating said base members with a moldable plastic material to attach said first and second base members together with said first and second internal passages in fluid communications with one another, said encapsulation forming a housing about said first base member having a thickness substantially less than the thickness of said first base member whereby said housing surrounds said first base member without being subjected to said internal pressure; and forming simultaneously from said plastic material during said encapsulation a third member integral with said housing and of sufficient inherent strength to withstand a mechanical load applied externally of said base members at a point spaced from said base members so that the application of said mechanical load is transmitted to said first base member.

Claim 16

A method of making a base component for a fluid transfer device, said transfer device having an inlet, an outlet, a pump chamber and a piston mounted for reciprocation in said chamber to transfer hydraulic fluid from a source to a hydraulically actuatable device, said method comprising the steps of: forming a first base member having an internal passage for receiving pressurized fluid which subjects said first base member to internal fluid pressure, said first base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; forming a seat in said first base member; forming a second base member having an internal passage therein for receiving pressurized fluid which subjects said second base member to internal fluid pressure, said second base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; inserting said second base member into said seat; encapsulating said first and second base members with a moldable plastic material to form a housing thereabout and attach said first and second base members together with said first and second internal passages in fluid communication with one another, said housing thickness being substantially less than the thickness of said first base member whereby said housing surrounds said first base member without being subjected to said internal fluid pressure; and forming simultaneously with said housing from said plastic material an integral portion of sufficient inherent strenght to withstand a mechanical load applied externally of said first and second base members so that said mechanical load is transmitted to said first base member.

Claim 17

A method of making a base component for a fluid transfer device, said transfer device having an inlet, an outlet, a pump chamber and a piston mounted for reciprocation in said chamber to transfer hydraulic fluid from a source to a hydraulically actuatable device, said method comprising the steps of: forming a first base member having an internal passage for receiving pressurized fluid which subjects said first base member to internal fluid pressure, said first base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; forming a seat in said first base member; forming a second base member having an internal passage therein for receiving pressurized fluid which subjects said second base member to internal fluid pressure, said second base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; inserting said second base member into said seat; encapsulating said first and second base members with a moldable plastic material to form a housing thereabout and attach said first and second base members together with said first and second internal passages in fluid communication with one another, said housing thickness being substantially less than the thickness of said first base member whereby said housing surrounds said first base member without being subjected to said internal fluid pressure; and forming simultaneously with said housing from said plastic material an integral portion of sufficient inherent strenght to withstand a mechanical load applied externally of said first and second base members so that said mechanical load is transmitted to said first base member.

Claim 19

A method of making a base component for a hydraulic hand pump having an inlet, an outlet and a piston and handle assembly operative upon reciprocation to transfer hydraulic fluid from a source through said base component to a hydraulically actuatable device, comprising the steps of: forming a base member having a plurality of internal passages for receiving pressurized hydraulic fluid which subjects said base member to internal fluid pressure, said base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; encapsulating said base member with a moldable plastic material to form a housing about said base member, said housing thickenss being substantially less than the thickness of said base member whereby said housing surrounds said base member without being subjected to said internal fluid pressure; and forming simultaneously with said housing from said plastic material an integral yoke member supported by said base member to pivotally receive the handle assembly.

Claim 20

A method of making a base component for a hydraulic hand pump having an inlet, an outlet and a piston and handle assembly operative upon reciprocation to transfer hydraulic fluid from a source through said base component to a hydraulically actuatable device, comprising the steps of: forming a base member having a plurality of internal passages for receiving pressurized hydraulic fluid which subjects said base member to internal fluid pressure, said base member formed of a material having sufficient inherent strength to withstand said internal fluid pressure without deformation thereof; encapsulating said base member with a moldable plastic material to form a housing about said base member, said housing thickenss being substantially less than the thickness of said base member whereby said housing surrounds said base member without being subjected to said internal fluid pressure; and forming simultaneously with said housing from said plastic material an integral yoke member supported by said base member to pivotally receive the handle assembly.