摘要:
A precision positioning device 1 having degrees of freedom along multi-axial directions includes a single unitary structure 2 and a plurality of expansion/contraction actuators 4a, 4b, and 4c. Movements of an object-to-be-positioned in the axial directions are effected through such elastic deformations of the unitary structure 2 as to move the object-to-be-positioned only in the axial directions. Forces to generate the elastic deformations are based on expansion/contraction of the expansion/contraction actuators 4a, 4b, and 4c incorporated in the unitary structure 2. The expansion/contraction actuators 4a, 4b, and 4c can be formed of piezoelectric elements.
摘要:
A thermoscopic unit such as for use in a thermostat of a fluid mixing valve comprising a hollow body in which a cylindrical convoluted bellows unit is located and sealed to the body to define an expansion chamber in which a thermally responsive material, such as wax, is contained. Temperature changes resulting in a change of volume of the material in the expansion chamber apply an external pressure to change the axial length of the bellows unit, and this may be operably connected to an actuator for a valve assembly. Preferably, there is a reservoir of the material constituted by a tubular coil encircling the hollow body, or a hollow cone extending therefrom. Such reservoir is filled with the material and is in communication with the expansion chamber and provides additional heat transfer surfaces to give fast response to temperature changes.
摘要:
A bellows assembly and method of making the assembly are disclosed. The assembly comprises a bellows head including thin walled flexible members which are joined to define an expansible chamber. An anchor fitting attaches and communicates the bellows head to a capillary tube and an expansible fluid occupies the tube and chamber. A base supports the bellows head and capillary tube with the anchor fitting interconnecting the bellows head, tube and base. The anchor fitting is bonded to the diaphragm member and capillary tube and deformably engages the base plate to clamp the base plate to the bellows head.
摘要:
A thermo-actuator has a steel rod, a guide member slidably mounted on the rod, a spool seal secured to the guide member, a heat conductive cylinder secured to the guide member, and wax pellets provided in the cylinder. The spool seal has a thin layer, so that the spool seal engages with the rod by a vacuum generated in the spool seal. The thickness of the spool seal is between 5% to 25% of the diameter of the steel rod.
摘要:
An actuator comprises an impervious deformable bladder containing a fluid whose boiling temperature is equal to a set cut-in temperature. On reaching that temperature, the fluid within the bladder will be vaporized, cause the bladder to expand, and produce accordingly a displacement movement which can be utilized for a variety of purposes.
摘要:
An aircraft instrument with an acceleration compensation device comprises at least a capsule, a rocking axle, a link mechanism to transmit displacements of a free end of the capsule to the rocking axle, a first gear integrally provided with the rocking axle, a second gear meshed with the first gear and being rotatable, and weights. The weights are provided on the first gear and the second gear each correspondingly, and rotative force of the weights caused by an acceleration force works on the rocking axle so as to cancel the rotative force of the rocking axle by the displacements, due to the acceleration, of the free end of the capsule.
摘要:
A low pressure indicator switch assembly for a pressure vessel of a vehicle air cushion restraint system which includes a body member with a threaded passage communicating with the interior of the pressure vessel. A Bourdon tube has an orificed end portion. A mounting bolt with a threaded shank extends through the orificed end portion and into the threaded passage of the body member to mount the end portion of the Bourdon tube to the body member. The threaded shank of the mounting bolt and the threaded passage of the pressure vessel define therebetween a passage for communicating pressure between the pressure vessel and the Bourdon tube. The assembly further includes contact means which is adapted to be connected with a warning device which is operatively controlled by the Bourdon tube for actuating the warning device when the pressure of the pressure vessel is below a predetermined pressure.
摘要:
A thermal element of a simple structure which can have a reduced cost because a minimum required number of structural components are used, excels in response and endurance and enables forward and backward movement of a piston with the prescribed stroke under the effect of volume changes following the expansion and contraction of a thermally expandable body. A thermal element 10 containing a thermally expandable body (wax 12) inside a case 11 comprises a piston 13 arranged inside the case along the axial line thereof. The inward end of the piston borders on the inside of the thermally expandable body and the outward end thereof protrudes outwardly from one end of the case, thereby enabling the piston to move forward and backward following the expansion and contraction of the thermally expandable body. The piston is slidably held with a guide member 14 disposed in a portion at one end inside the case. Furthermore, a sealing member 15 is disposed in a portion at the inward end of the guide member inside the case and seals the thermally expandable body at the other end inside the case.
摘要:
A three-side covering seam-type bellows includes a plurality of essentially C-shaped sheets of mutually identical configuration, the sheets being piled to each other for forming the bellows. The bellows has a pair of obliquely extending lower edges provided for each of the sheets. An outer sewing line extends along the outer peripheral edge of each of the sheets, the outer sewing line extending to the inner end of the obliquely extending lower edges, and an inner sewing line extends along the inner peripheral edge of each of the sheets, the inner sewing line being terminated at terminating points on the inner peripheral edges extending from the inner end of the obliquely extending edge and spaced apart from the inner end. A pair of unsewn portions are formed between the inner ends and the termination points.