A head unit system for controlling an object includes a head unit device that include shear thickening fluid (STF) and a chamber configured to contain the STF. The chamber further includes a set of gates between a front channel and a back channel. The set of gates includes a bypass opening set. The head unit device further includes a cupped piston housed at least partially radially within the chamber. The set of gates is configured to control flow of the STF between the front channel and the back channel to control rotational movement of the object.

A method for determining the position of a first part moving in relation to a second part in a system, comprising forming a code on a surface of the first part or the second part, yielding an encoded surface; detecting the code on the encoded surface; decoding the code; and determining the position of the moving part from the decoding of the code; the code comprises microstructures at precisely selected positions on the surface of the encoded part; detecting the code comprises scanning the encoded surface with a sensor in conditions selected in relation to the code formed and to the encoded surface to precisely read the code on the encoded surface.

A pressure vessel arrangement includes a pressure vessel and an optical sensor arrangement. The pressure vessel includes: a cylinder construction having a cylinder wall extending from a cylinder wall first end to a cylinder wall second end, and having an internal surface forming an interior region; a first end cap closing the cylinder wall first end and having an optical window located therein to permit passage of light therethough and into the interior region; a second end cap closing the cylinder wall second end; and a piston constructed to slide within the cylinder construction interior region along a direction between the cylinder all first end and the cylinder wall second end and along the cylinder construction internal surface to separate the interior region into a first end interior region and a second end interior region. The pressure vessel is constructed to withstand a fatigue test of one million cycles at 5,000 psi without failure. The optical sensor arrangement is located outside of the optical window and includes an emitter for emitting light through the optical window and into the interior region and receiving for receiving light reflected from the piston. Also included is a method for providing a piston position feedback in a pressure vessel.

A carrier comprising a hydraulic cylinder having a piston, a controller and a piston position sensor, wherein the carrier is arranged to carry an accessory through the use of the hydraulic cylinder and wherein the controller is configured to: receive piston position information; determine a direction of movement of the piston; and if the piston position equals a stop distance from an end wall of the hydraulic cylinder in the direction of movement, abort the movement.

A carrier comprising a hydraulic cylinder having a piston, a controller and a piston position sensor, wherein the carrier is arranged to carry an accessory through the use of the hydraulic cylinder and wherein the controller is configured to: receive piston position information; determine a direction of movement of the piston; and if the piston position equals a stop distance from an end wall of the hydraulic cylinder in the direction of movement, abort the movement.

A system (1) for spiking, i.e. exploring voltage, in electric cables (5) comprises a first clamping jaw (3) and a second clamping jaw (4) to lock a portion of an electric cable (5) in a clamping position (7), an elongated metal blade (8) which can be displaced between a retracted position and an extended position in the clamping position (7), a hydraulic actuator (9) to displace the blade (8), with respect to the first and second clamping jaws (3, 4), from the retracted position into the extended position, a pump (10) adapted to increase the pressure of a hydraulic liquid acting on the hydraulic actuator (9), a hand-held remote control (12) for remotely actuating and controlling the pump (10), wireless actuation communication means (13) adapted to provide pump actuation signals from the remote control (12) to the pump (10).

A system (1) for spiking, i.e. exploring voltage, in electric cables (5) comprises a first clamping jaw (3) and a second clamping jaw (4) to lock a portion of an electric cable (5) in a clamping position (7), an elongated metal blade (8) which can be displaced between a retracted position and an extended position in the clamping position (7), a hydraulic actuator (9) to displace the blade (8), with respect to the first and second clamping jaws (3, 4), from the retracted position into the extended position, a pump (10) adapted to increase the pressure of a hydraulic liquid acting on the hydraulic actuator (9), a hand-held remote control (12) for remotely actuating and controlling the pump (10), wireless actuation communication means (13) adapted to provide pump actuation signals from the remote control (12) to the pump (10).

A position sensor (1.1, 1.2) for a working cylinder (2.1, 2.2) with a cable drum (4.1, 4.2), a cable (5) with a piston anchor (7.1, 7.2) and an interface (13.1, 13.2) for determining a position and a movement of a piston (3.1, 3.2) of the working cylinder (2.1, 2.2), the position sensor (1.1, 1.2) is to be operatively connected to the working cylinder (2.1, 2.2) from outside in the area of a cylinder head (15.1, 15.2).

A wheeled work vehicle includes: a transmission transmitting the rotational power of a traveling hydraulic motor to wheels; a traveling control valve having an interruption position that interrupts supply of hydraulic fluid from a hydraulic pump to the traveling hydraulic motor; a shift changeover valve that shifts the speed stage of the transmission by the position of the shift changeover valve being selectively switched; and a controller that controls the traveling control valve and the shift changeover valve. The controller switches the traveling control valve to the interruption position, then switches the position of the shift changeover valve such that the speed stage of the transmission is shifted to the low speed stage, and switches the traveling control valve from the interruption position to an original position side before the switching in a case where the controller shifts the transmission from the high speed stage to the low speed stage.

A piston and cylinder unit (1) of a working machine, for example a wheel loader, excavator, tipper, crane or stacker or a lifting platform serves to steer, support, extend, pivot, lift or other movements of the working machine or of a tool or a different part of the working machine. The piston and cylinder unit (1) includes a cylinder (2), a piston (7) being arranged in the cylinder (2) to be axially movable and a piston position detection unit (28) detecting the axial position of the piston (7) in the cylinder (2) by high frequency technology. The piston position detection unit (28) includes a housing (3) and an electronic unit being arranged in the housing is arranged in a mounting bore (27) extending radially in the cylinder (2). The piston position detection unit (28) is arranged in the mounting bore (27) such that the interior (3) of the cylinder (2) is sealed from the surroundings of the piston and cylinder unit (1) by the housing (29).