Abstract: An electromagnetic valve for use in controlling fluid flow between first and second passageways in a hydraulic valve block includes a valve body. The valve body defines a central axis, has a central opening therethrough, and has a lower end adapted to be inserted into a bore of the valve block. A hollow valve dome is attached to an upper end of the valve body. An armature is axially moveable within the valve dome. A spring biases the armature in one axial direction. A closing element is coupled to a lower end of the armature. An electromagnetic coil coaxially surrounds the armature and is operable to effect axial movement of the armature in an axial direction opposite the one axial direction. A valve seat member is carried by a lower end of the valve body and has an orifice providing fluid flow between the first and second valve block passageways. The valve seat member defines a valve seat that surrounds the orifice and cooperates with the closing element for selectively closing the orifice.

Abstract: An electromagnetic valve (32) for use in controlling fluid flow between first and second passageways (P1, P2) in a hydraulic valve block (4), includes a valve body (51). The valve body (51) defines a central axis (A), has a central opening (51A) therethrough, has a lower end (54) adapted to be inserted into a bore (19) of the valve block (4), and is provided with a lower cylindrical opening (70). An armature (56) is axially movable within the valve body (51) and is biased by a spring in one axial direction (57A). A closing element (88) is carried by a lower end (54) of the armature (56). An electromagnetic coil (64) coaxially surrounds the armature (56) and is operable to effect axial movement of the armature (56) in an axial direction opposite the one direction (57B). A valve seat member (62) is carried by the lower end (54) of the valve body (51) and has an orifice (98) providing fluid flow between the first and second valve block passageways (P1, P2).

Abstract: An electromagnetic valve for use in controlling fluid flow between first and second passageways in a hydraulic valve block includes a valve body. The valve body defines a central axis, has a central opening therethrough, and has a lower end adapted to be inserted into a bore of the valve block. A hollow valve dome is attached to an upper end of the valve body. An armature is axially moveable within the valve dome. A spring biases the armature in one axial direction. A closing element is coupled to a lower end of the armature. An electromagnetic coil coaxially surrounds the armature and is operable to effect axial movement of the armature in an axial direction opposite the one axial direction. A valve seat member is carried by a lower end of the valve body and has an orifice providing fluid flow between the first and second valve block passageways. The valve seat member defines a valve seat that surrounds the orifice and cooperates with the closing element for selectively closing the orifice.

Abstract: An electromagnetic valve (32) for use in controlling fluid flow between first and second passageways (P1, P2) in a hydraulic valve block (4), includes a valve body (51). The valve body (51) defines a central axis (A), has a central opening (51A) therethrough, has a lower end (54) adapted to be inserted into a bore (19) of the valve block (4), and is provided with a lower cylindrical opening (70). An armature (56) is axially movable within the valve body (51) and is biased by a spring in one axial direction (57A). A closing element (88) is carried by a lower end (54) of the armature (56). An electromagnetic coil (64) coaxially surrounds the armature (56) and is operable to effect axial movement of the armature (56) in an axial direction opposite the one direction (57B). A valve seat member (62) is carried by the lower end (54) of the valve body (51) and has an orifice (98) providing fluid flow between the first and second valve block passageways (P1, P2).

Abstract: In a magnetoresistive reproduce head which is self-biased by a saturated soft adjacent layer magnetically coupled to the magnetoresistive element, the induced anisotropy fields of the magnetoresistive element and the soft adjacent layer are made to lie in the direction of the bias field at the magnetoresistive element rather than perpendicular to the bias field. These induced anistropy fields partially counteract demagnetizing fields which oppose the bias field, and thereby lower the current in the magnetoresistive element required to saturate the soft adjacent layer in biasing the magnetoresistive element. The lowered current reduces the Joule heating of the magnetoresistive element and attendantly results in improved head performance.

Abstract: A ferrimagnetic medium is locally heated above its compensation temperature and a magnetic record head provides a magnetic field for data recording on the heated portion of the medium. Upon re-cooling to the compensation temperature, the recorded signal is magnetically "locked" in the medium. The user of a magnetic head to provide the recording magnetic field allows fast head current switching rates with attendant high density data recording or high speed erasure of the medium. The recorded medium is read by means of conventional magneto-optic apparatus.

Abstract: A gasket of improved compressibility and recovery characteristics, and high temperature resistance. The gasket has a central annular core having upper and lower generally flat face portions, and first and second annular sheet members having an upwardly projecting and downwardly facing annular embossment respectively, each defining a concave recess facing the associated flat face portion. The sheet members are secured to the core. A high temperature resistant filler material of high recovery characteristics is provided and trapped in each of the recesses in confronting relation to the respective flat face portions.

Abstract: A magnetic bubble replication and transfer arrangement is disclosed which provides for replicating magnetic bubbles in thin planar layers of magnetic material without the need for electrical current carrying conductor elements. The arrangement includes a replicating half-disc permalloy element disposed in a particular way between first and second tracks formed from half-disc elements which are deposited on a surface of the magnetic layer. When a rotating magnetic field in the plane of the material is rotated in a predetermined direction with respect to the above arrangement, replication of a bubble in the first track occurs at a replication region where a portion of the replicating element is adjacent the first track. The original bubble continues movement within the first track while the newly formed bubble moves along the replicating element into the second track in response to rotation of the in-plane magnetic field.

Abstract: The present invention is a method and apparatus for passive generation of magnetic bubbles in thin layers of magnetic materials, such as garnets, and uses specially designed permalloy elements which with the rotation of an in-plane magnetic field act to generate magnetic bubbles over a wide range of bias magnetic field values. The design of a special permalloy element includes an angular portion and a contiguous remaining portion having a large surface area relative to the angular portion. Pulsing of the in-plane rotating field to higher field values as it passes through a predetermined orientation with respect to the angular portion generates magnetic bubbles in a controllable manner for fixed values of the bias field.

Abstract: A method of sealing a cavity or recess with a one-component sealing material which cures in the presence of moisture, comprising the steps of filling the recess or cavity with a moisture curable material and inserting a water-carrying member into said recess or cavity to provide moisture and cause the moisture curable material to cure in said recess or cavity. A sealing assembly is also provided comprising a cured body of moisture curable material having a water-carrying member embedded therein.