Abstract:
The force measuring device comprises two plates arranged essentially parallel to each other and having therein between an elastomeric material into which a pressure sensor is embedded.
Abstract:
The present invention is a pressure sensing and measurement device that eliminates errors due to compliance and lack of sensitivity. The cell uses a pressure receiving means (such as a flexible diaphragm) to detect an impinging object, a means to counteract the pressure caused by the impinging object (such as internal hydraulic pressure), and a detector to measure the amount of internal pressure used to counteract the impinging force. Since the cell is internally pressurized to a point equal to a value equal to the external pressure, the diaphragm is undeflected and may avoid the problems inherent in simple diaphragm systems (such as bridging and insensitivity).
Abstract:
An elongated elastically deformable housing is responsive to external force applied thereto and is connectable to a pressure evaluation device. A rigid tube longitudinally traverses the housing and defines therewith a closed annular space around the tube, which has a plurality of radial bores formed therein in an array extending the length of the housing and connecting the interior of the tube with the annular space, a hydraulic fluid being contained in the annular space and the tube. Means are provided at one end of the tube for the connection thereof to the pressure evaluation device.
Abstract:
The load measurement apparatus includes a pressure arm 60 rigidly coupled to a structural member whose load is to be measured, and a miniature instrumented hydrostatic cell rigidly mounted in proximity to the pressure arm so that a membrane of the cell engages the pressure arm and displaces as the pressure arm displaces. In one embodiment, the cell includes a housing consisting of a first cylindrical portion 20 and a second cylindrical portion 22 integral with and centrally projecting from the first cylindrical portion. A cylindrical cavity 24 is formed within the housing portions and coaxial therewith. At one end, the cavity is closed by a thin membrane 26, and at its other end, the cavity communicates with a threaded bore that receives and is closed by female portion 34 and male portion 36 of a seal. A temperature compensation insert 30 is disposed within the cavity, and the portions of the cavity not occupied by the insert are completely filled with an incompressible fluid that is introduced through the seal. The pressure within the cavity is measured by a pressure transducer 50. The cell is disposed within a cavity of a receptacle member 64 and the membrane thereof is urged into engagement with a sphere 66 embedded in the pressure arm by a pair of Belleville disc springs 72, 74 disposed within the receptacle member cavity and by an adjustment plug 78 threadably received in that cavity.
Abstract:
A robotics manipulator utilizes a fluid pressure control system to provide a response to the gripping force of the robotics manipulator on an object. The force is converted to a change in fluid pressure that is sensed in a fluid flow channel. This change in pressure or flow is in turn used to provide the control system for the robotics manipulator with information on how hard an object is being gripped.
Abstract:
A testing tool for studs and similarly mounted fasteners comprises a cylinder having a base adapted to rest against the surface from which the stud protrudes and a piston axially movable in the cylinder with a hollow piston rod through which an enlarged threaded rod slidably extends, the end of the threaded rod adjacent the base having means to grip a stud when the base of the cylinder is seated against the stud-mounting surface. In one embodiment of the invention, a collar with handles is threadably mounted on the end of the externally threaded rod remote from the base abutting the adjacent end of the piston rod and a hydraulic pressure gauge is attached to the end portion of the cylinder nearest the base so that when the collar is rotated by its handles to apply tension to the stud, it forces the piston downwardly in the cylinder so that the pressure shown on the gauge is proportional to the tension applied to the stud. In another embodiment of the invention, a handgrip-actuated eccentric cam is mounted on the upper end of the stud-gripping rod in place of the collar threadably mounted on the stud-gripping rod for applying tension to the stud and downward pressure on the piston rod.
Abstract:
To permit adjustment of the engagement pressure of mutually engaged roller elements, such as bearer rings (1, 3) or rubber blanket cylinders (31-34) against an impression cylinder or plate cylinders (35-38), a blind bore (4) is formed in the respective roller elements in a zone where engagement pressure will result in deformation in a wall of the blind bore, the bore being filled with a fluid such as hydraulic fluid, silicone, or the like, the pressure of which is determined by a pressure transducer such as a piezoelectric element coupled, through an amplifier, to a peak detector which indicates pressure upon axial alignment of the blind bore (4) and the axes of rotation of the respective engaging rollers. A base pressure in the chamber can be adjusted by an outside adjustment screw which, like the transducer, is preferably carried on an external adapter element attached to the respective roller.
Abstract:
This disclosure describes a hydraulic type load indicator for the measurement of large tensile forces. It comprises a load cell which is made up of two flat metal parts held together by screws. At the interface between the two parts is a flat neoprene circular diaphragm with molded circumferential ''''O'''' ring, a circular piston fits into a corresponding opening in the top plate and pressed on the diaphragm. There is a circular cavity under the diaphragm which is filled with liquid. Pressure on the piston causes downward movement of the diaphragm and compression of the liquid. The compression in the liquid is measured by a conventional Bourdon indicator element. A hook is attached to a yoke which slips over the two plates and pressed on the piston by means of a ball seated in a cavity in the center of the top of the piston. The principle novelty of this invention lies in the design of the diaphragm so as to provide linear readings of the pressure gauge with force supplied to the piston, and in the design of the system so that a very minimum volume of liquid can be used and thereby minimize the effect of temperature on the gauge reading due to the temperature expansion coefficient of the liquid. Another important feature includes the simplicity of the design, construction, and the assembly of the instrument.
Abstract:
A wave force transducer, including a shell mounted around a support column by a set of flexures which permit substantially only lateral movement of said shell and a set of hydraulic load cells spaced around said shell between said shell and support column which measure the total wave force acting upon said shell.
Abstract:
A hydraulic device is interposed between the vehicle spring and a wheel support member of a motor vehicle suspension system. The device contains an expansible chamber that changes its volume in proportion to the vehicle loading. The chamber volume is sensed by an indicator that gives a reading to the vehicle operator of the load being carried by the vehicle.