Electrical rectilinear-motion devices

Claim 2

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member extending beyond at least one of the field end faces, means associated with the armature shaft and with the tubular member to bound therein two liquid-filled hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, a limited delivery duct interconnecting said enclosures for limiting the armature shaft speed, and means for progressively closing said duct when the armature shaft approaches its limit of travel so as to brake the armature shaft.

Claim 3

A device according to claim 1, wherein the tubular member is closed at its ends by end plates and extends beyond both the field device end faces, and wherein the armature shaft comprise a central drive part having a central passage acting as said limited delivery duct and interconnecting the two enclosures bounded laterally by the end plates and the field end faces, and two lateral parts which extend beyond the enclosures through gaskets in said end plates, the diameters of said lateral parts being the same but different from the diameter of the central drive parT.

Claim 4

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member secured to the field and extending beyond both field end faces, and means associated with the armature shaft and with the tubular member to bound therein two liquid-filled hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, said means including pistons secured to the two ends of the armature shaft and sliding hermetically within the tubular member, the armature shaft being pierced with a central passage interconnecting the enclosures bounded laterally by the pistons and the end faces of the field, said central passage in the armature shaft limiting the speed of movement thereof.

Claim 5

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member secured to the field and extending beyond both field end faces, and means associated with the armature shaft and with the tubular member to bound therein two liquid-filled hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, said means including pistons secured to the two ends of the armature shaft and sliding hermetically within the tubular member, the armature shaft being pierced with a central passage interconnecting the enclosures bounded laterally by the pistons and the end faces of the field, said central passage in the armature shaft limiting the speed of movement thereof.

Claim 6

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member secured to the field and extending beyond only one of the field end faces, and means associated with the armature shaft and with the tubular member to bound therein two liquid-filled hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, the armature shaft being centered and guided hermetically at the ends of the tubular member, said means including a piston secured thereto at a predetermined distance from said one end face of the field and movable in said tubular member so as to define said two enclosures and further comprising a limited delivery duct interconnecting said enclosures for limiting the armature shaft speed.

Claim 7

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member secured to the field and extending beyond only one of the field end faces, and means associated with the armature shaft and with the tubular member to bound therein two liquid-filled hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, the armature shaft being centered and guided hermetically at the ends of the tubular member, said means including a piston secured thereto at a predetermined distance from said one end face of the field and movable in said tubular member so as to define said two enclosures and further comprising a limited delivery duct interconnecting said enclosures for limiting the armature shaft speed.

Claim 8

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member extending beyond both end faces of the field so as to bound therein two liquid-field hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, and wherein gaskets are provided to inhibit fluid flow along the air gap between the field and the armature shaft, the armature shaft having means for immobilizing it hydraulically in the absence of any electrodynamic force including: a central tube experiencing the magnetic field produced by the field; two cylindrical side shafts secured to the central tube ends, the side shafts having a different diameter from the central tube and moving hermetically through end plates disposed at the ends of the tubular member; a hollow valve moving in the central tube; and springs immobilizing the hollow valve at the center of the central tube in the absence of field; the central tube and the hollow valve having at their ends radial passages so disposed relatively to one another so as to interrupt any liquid flow between the two enclosures when the field is not energized and as to allow liquid flow, and therefore shaft movement, at a limited speed when the hollow valve is moved by the electromagnetic field in the central tube until abutting the inside end face of one of the side shafts.

Claim 9

A rectilinear-motion drive device of the longitudinally moving magnetic field type including a field and an armature shaft movable therein, comprising a coaxial tubular member extending beyond both end faces of the field so as to bound therein two liquid-field hermetic enclosures through which the armature shaft extends so that the volumes of said enclosures vary in inverse proportion and by the same amount for a movement of the armature shaft in either direction, and wherein gaskets are provided to inhibit fluid flow along the air gap between the field and the armature shaft, the armature shaft having means for immobilizing it hydraulically in the absence of any electrodynamic force including: a central tube experiencing the magnetic field produced by the field; two cylindrical side shafts secured to the central tube ends, the side shafts having a different diameter from the central tube and moving hermetically through end plates disposed at the ends of the tubular member; a hollow valve moving in the central tube; and springs immobilizing the hollow valve at the center of the central tube in the absence of field; the central tube and the hollow valve having at their ends radial passages so disposed relatively to one another so as to interrupt any liquid flow between the two enclosures when the field is not energized and as to allow liquid flow, and therefore shaft movement, at a limited speed when the hollow valve is moved by the electromagnetic field in the central tube until abutting the inside end face of one of the side shafts.