Abstract: According to one embodiment, a gripping tool includes a gripper. The gripper is flexible. A plurality of granular materials is provided in an interior of the gripper. The gripping tool grips a workpiece by depressurizing the interior of the gripper in a state in which the gripper is caused to contact the workpiece. A diameter of at least a portion of the granular materials is less than 1774 ?m.

Abstract: A work machine that can detect abnormality such as a malfunction and wear and tear of each of hydraulic pumps including control equipment with high precision and that can reduce equipment cost is provided. A controller 9 according to the present invention includes a volumetric-transfer-efficiency-calculating section 94 that calculates a volumetric transfer efficiency ?C representing a transfer efficiency of hydraulic oil between a hydraulic cylinder 11 and hydraulic pumps 21 to 23 on the basis of a target discharge flow rate calculated by a target-discharge-flow-rate-calculating section 932 and the speed of the hydraulic cylinder 11 that is detected by a speed sensor 28, and an abnormality decision section 95 that decides whether any one of the hydraulic pumps 21 to 23 is abnormal on the basis of the volumetric transfer efficiency ?C calculated by the volumetric-transfer-efficiency-calculating section 94.

Abstract: A battery authentication system includes a battery pack, and a host device connected to the battery pack to charge the battery pack. The battery pack includes a battery, a discharge switch that turns on and off discharging of the battery, a charge switch that turns on and off charging of the battery, and a control integrated circuit (IC) that controls the battery. The control IC includes a charge/discharge control circuit that controls the discharge switch and the charge switch, and an authentication circuit that performs a process for performing an authentication with the host device. The authentication circuit is configured to perform a process associated with a first authentication. The charge/discharge control circuit is configured to control the discharge switch to be turned on when the first authentication is established. The authentication circuit is configured to perform a process associated with a second authentication.

Abstract: According to one embodiment, a gripping tool includes a gripper. The gripper is flexible and includes a first portion contacting a workpiece, a second portion opposing the first portion, and a granular material provided between the first portion and the second portion. The first portion includes a concave portion and a convex portion. The concave portion is recessed in a first direction. The first direction is from the first portion toward the second portion. The convex portion is provided around the concave portion and protrudes in a second direction. The second direction is the reverse of the first direction. The concave portion has a groove having a ring configuration recessed outward from a center of the gripper.

Abstract: According to one embodiment, a gripping tool includes a gripper, a sensor, a pump unit, and a controller. The gripper is flexible and has a granular material provided in an interior of the gripper. The sensor is connected to the interior. The sensor detects a pressure or a flow rate of a gas. The pump unit is connected to the interior. The controller performs at least a first operation of causing the gripper to contact a workpiece and causing the gripper to operate, and a second operation of separating the gripper from the workpiece and causing the gripper to operate. In at least a portion of the second operation, the controller sets a pressure of the interior to be different from a pressure external to the gripper.

Abstract: According to one embodiment, a gripping tool includes a gripper. The gripper is flexible. A granular material is provided in an interior of the gripper. The gripping tool grips a workpiece by depressurizing the interior of the gripper in a state in which the gripper is caused to contact the workpiece. The gripper includes a first portion contacting the workpiece, a second portion opposing the first portion, and a fibrous membrane having a plurality of pores and being provided between the first portion and the second portion. A diameter of at least a portion of the pores is smaller than a diameter of the granular material. The granular material is provided between the fibrous membrane and the second portion.

Abstract: Provided is a construction machine capable of detecting a stuck-open state of a surplus flow control valve in real time during operation without involving a reduction in the operational speed.

Abstract: A work machine includes a closed circuit system in which there is provided a flushing valve.

Abstract: Provided is a work machine that can selectively establish a closed circuit connection between a single rod-type hydraulic cylinder and a plurality of bidirectional-type hydraulic pumps, the work machine being capable of enhancing responsiveness of the single rod-type hydraulic cylinder when a high-speed lever switching operation is conducted in a state in which a rod pressure of the single rod-type hydraulic cylinder is higher than a bottom pressure. When a bucket lever (70a) is operated to a side of extending the bucket cylinder in a state in which a pressure in a rod chamber (5b) of the bucket cylinder (5) is higher than a pressure in a bottom chamber (5a), a controller (50) opens a rod-side proportional valve (45) and discharges a working fluid in the rod chamber to a working fluid tank (25) such that a differential pressure between the pressure in the rod chamber and the pressure in the bottom chamber is reduced below a switching pressure (Psw) of a flushing valve (33).

Abstract: A construction machine is provided which includes a hydraulic closed circuit in which a single rod hydraulic cylinder is driven directly by a bidirectionally tiltable variable displacement pump and can stably speed up the contraction action of the single rod hydraulic cylinder. In the case where a contraction action of a hydraulic cylinder 10 is instructed through an operation lever 30, when a differential pressure obtained by subtracting the pressure of a cap chamber 10a from the pressure of a rod chamber 10b is equal to or lower than a first threshold value a set to a level equal to or higher than a selection setting pressure of a flushing valve 14, a controller 20 closes a rod side selector valve 12b to disable rod assist action for supplying hydraulic fluid from a second hydraulic pump 8 to the rod chamber, and when the differential pressure is higher than the first threshold value, the controller 20 opens the rod side selector valve to enable the rod assist action.

Abstract: A construction machine includes a bidirectionally tiltable type hydraulic pump 2, a hydraulic cylinder 1 having a cap chamber 1e and a rod chamber 1f, a first flow path 11 connecting the hydraulic pump 2 and the cap chamber 1e, a second flow path 12 connecting the hydraulic pump 2 and the rod chamber 1f, a discharge flow path 16 branched from the first flow path 11, a discharge valve 32 that is disposed in the discharge flow path 16 and controls a discharge rate of hydraulic working oil from the cap chamber 1e to the discharge flow path 16, an operation device 54 that instructs an action of the hydraulic cylinder 1, and a controller 56.

Abstract: A construction machine incorporates a hydraulic closed circuit system capable of suppressing, even where a selector valve is stuck in an open state by a failure of the selector valve or a control system therefor, unintended operation of a hydraulic actuator and continuing operation of a machine body. The construction machine includes first sensors that detect open-closed states of a plurality of switching valves, first compulsory valve closing devices that change over the plurality of switching valves to a closed position irrespective of open-close control by a machine body controller, and a valve device controller that controls, when it is detected based on the open-closed states of the plurality of selector values detected by the first sensors that one of the plurality of selector values is stuck in an open state, the first compulsory valve closing device such that other selector valve connected to one of the plurality of closed circuit pumps to which the one selector valve is connected is closed.

Abstract: A drive system for a construction machine capable of appropriately controlling a distribution flow rate to each hydraulic actuator and improving operability by an operator is provided.

Abstract: A display device, configured to display an image photographed by a camera mounted on a remotely controlled mobile object, includes a display part which is mountable on a head of a user and capable of displaying an image, a receiving part configured to receive a photographed image and position information of the mobile object transmitted from the mobile object, a position detection part configured to detect a position of the display part, a direction detection part configured to detect a direction of the display part, and a controller configured to control image displaying on the display part, determine whether the mobile object exists in the direction of the display part and within a particular range with respect to a position of the display part, and switch images to be displayed on the display part depending on whether the mobile object exists within the particular range or not.

Abstract: A head-mounted display includes a mounting fixture mounted on a user's head, an image display device including an image light unit that generates image light, a half mirror, and a casing, a connection fixture that mounts the image display device with respect to the mounting fixture, a first ball joint that connects the mounting fixture and the connection fixture, and a second ball joint that connects the image display device and the connection fixture. The connection fixture holds the image display device in front of a user's eyes. The second ball joint extends in right and left directions, and rotatably supports the image display device with respect to the connection fixture in a state in which a rotational axis, disposed on a rear side of the image display device, is set as a supporting point. The second ball joint changes a direction of image light that is emitted.

Abstract: To provide a work machine capable of efficiently regenerating the energy owned by hydraulic fluid during a swing deceleration.

Abstract: To provide a work machine which, in a configuration provided with a closed-circuit pump and an open-circuit pump, is capable of stabilizing respective pump operations of the closed-circuit pump and the open-circuit pump and of improving the mountability of the closed-circuit pump and the open-circuit pump. The present invention is provided with a closed circuit in which a closed-circuit pump and a boom cylinder are connected annularly, and an open circuit which has an open-circuit pump for making hydraulic fluid flow in from a reservoir and flow out and a connection passage capable of introducing hydraulic fluid into the closed circuit, wherein the closed-circuit pump is installed above the open-circuit pump.

Abstract: This construction machine includes a first hydraulic drive device that is driven by a first prime mover and a second hydraulic drive device that is driven by a second prime mover. The first hydraulic drive device has a first closed circuit that connects a first hydraulic actuator and a first closed-circuit pump and a first assist flow path that connects the first closed circuit and a first open-circuit pump and that supplies pressure oil from the first open-circuit pump to the first closed circuit. The second hydraulic drive device is provided with a second closed circuit that connects a second hydraulic actuator and a second closed-circuit pump. The present invention also includes a first emergency flow path that branches from the first assist flow path and connects to the second closed circuit and that supplies pressure oil from the first open-circuit pump to the second closed circuit.

Abstract: According to one embodiment, a gripping tool includes a gripper. The gripper is flexible. A granular material is provided in an interior of the gripper. The gripping tool grips a workpiece by depressurizing the interior of the gripper in a state in which the gripper is caused to contact the workpiece. At least a portion of the gripper includes a resin member and a fibrous member. The fibrous member is provided inside the resin member.

Abstract: According to one embodiment, a gripping tool includes a gripper and a suction pad. The gripper is flexible. A granular material is provided in an interior of the gripper. The suction pad includes a pad portion and a pipe-shaped member and is surrounded with the gripper. The pad portion suctions a workpiece. The pipe-shaped member is connected to the pad portion. The suction pad is movable with respect to the gripper in a first direction. The first direction is from the pad portion toward the pipe-shaped member.