A miniature patch-type control infusion device includes an infusion unit (102). The infusion unit (102) comprises a drug storage unit(s) (100), a metal piece (110), a piston(s) (120), a rigid screw(s) (130), a rotating shaft (160), a driving unit(s) (150), a driving wheel(s) (140) provided with wheel teeth (141), a power unit(s) (180) and a rebound unit(s) (170). The driving unit (150) includes at least two driving portions (151a, 151b). The driving unit (150) can rotate around the rotating shaft (160) in the driving direction and the returning direction. The power unit (180) and the rebound unit (170) cooperate with each other to apply force to the driving unit (150) to rotate the driving unit (150). The infusion device also includes a position detector(s) (190), the metal piece (110) and the position detector(s) (190) interact to generate signals. Using this infusion device, patients will have more infusion rate options, which increase the flexibility of controlling drug infusion.

A unilaterally driven drug infusion device includes: a reservoir, a piston and a screw, the piston connected with the screw and arranged in the reservoir; a driving unit including rotating shaft and driving member, and the driving member including driving end; driving wheel provided with wheel teeth; a linear actuator and a reset unit respectively connected to the driving member; and at least two blocking walls, arranged at one side of the driving unit to limit the advancing position of the driving unit. The infusion device is able to precisely control the rotation amplitude of the driving member and improve the infusion accuracy of the infusion device. The user or the closed-loop system is able to flexibly select different infusion modes to precisely control the body fluid level to meet the needs of the body, improving user experience.

A unidirectional ratchet wrench structure has a wrench member, a pawl and a ratchet. The wrench member has an accepting space for accommodating the ratchet and an accepting space for accommodating the pawl. A toothed section of the pawl has a plurality of equiangular teeth and an irregular tooth. Since the irregular tooth is lower than the height of the equiangular teeth, the irregular teeth irregular tooth is capable of quickly disengaging from the equiangular teeth of the ratchet. The arc section and the toothed section have different arc measures and not push against the outer periphery of the ratchet at the same time, through the abutment of the pivoting point and the change of the center of gravity of the pawl when the wrench is rotated, the pawl is capable of producing a seesaw yaw movement to achieves the effect of quick engagement and disengagement.

In order to provide a ratchet wrench handle A that can be used with a reduced swing width of the handle without reducing the torque at the time of rotating a tool, the operation piece 9 is composed of two partial members, i.e., a claw member 9a and a receiving member 9b; and when an adapter t is rotated in the positive direction, with a positive rotation-aimed operation teeth 9a1 of the claw member 9a engaged with ratchet teeth 6 of a rotation member 3, a wedge effect given by the positive rotation-aimed operation teeth 9a1 of the claw member 9a and a claw member's first positive rotation-aimed sloping face 9a3 of the claw member 9a makes the rotation member 3 stop its rotation, which allows the adapter t to be rotated in the positive direction.

A hydraulic torque wrench is disclosed and includes a nut engaging portion with ratchet teeth on an external surface thereof. There is also a support member which can rotate relative to whilst retaining the nut engaging portion. A ratchet mechanism cooperates with the ratchet teeth to apply a rotational force to the nut engaging portion as a result of the pushing force from a hydraulic ram. Side plate cover a junction between the nut engaging portion and the support member with the side plates having a noncircular aperture through which a nut and bolt can extend when the wrench is in use.

A tool for retracting pistons into cylinder bores is disclosed, with a narrow gap between facing pressure plates allowing use of the tool in tight places, and ratcheting spreading of the facing pressure plates causing outward moving of the pistons, enabling work to be performed, wherein movement of a threaded stud through a coupler moves a first pressure plate.

A control device is provided with a communication unit and a processing unit. The communication unit makes communication with a tool that is used for the work of fastening a fastener (for example, a screw) and with an image pickup unit for capturing an image of the work site where the work is being performed. The processing unit executes a determination process of determining whether or not the work is being performed normally on the basis of the fastening torque applied to the fastener by the tool and the image captured by the image pickup unit.

A shifting device includes a sleeve module and a shifting member movably disposed in the sleeve module. The sleeve module has a through hole. The through hole is divided into a first hole region, a buffering region, and a second hole region. The shifting member includes a third operating section and a fourth operating section. The shifting member is movable between a first position and a second position. The fourth operating section of the shifting member is situated in the buffering region when the shifting member assumes the first position, and the second hole region and the third working hole are adapted to turn a fastening member. The third operating section of the shifting member is situated in the buffering region when the shifting member assumes the second position, and the first hole region and the fourth working hole are adapted to turn the fastening member.

A ratchet wrench includes a fastener drive member and a rigid, one-piece frame having a handle portion extending along a longitudinal frame axis between a head portion and a finger loop. The fastener drive member has a pair of drive openings centered on the drive axis and facing in opposite directions, with each of the drive openings defined by one or more drive surfaces. One of the drive openings is sized to receive a fastener or driver bit of a first size and the other opening is sized to receive a fastener or driver bit of a second size greater than the first size. The finger loop has a finger receiving opening sized to receive and encircle a finger of a user. The fastener drive member is mounted in the head portion to rotate about a drive axis, and a ratchet mechanism is mounted in the head portion in operable connection to the fastener drive member to selectively transfer torque from the frame to the fastener drive member in either a clockwise or counterclockwise direction about the drive axis.

A ratchet wrench includes a box, a button, a switch and an engagement element. The box includes an upper opening, a channel, a switch chamber in communication with the upper opening via the channel, and a button aperture in communication with the switch chamber. The button is inserted in the switch chamber via the button aperture. The button includes an abutment portion to keep the button in the box. The switch includes an arched portion extending in the switch chamber around the button. The switch is operable to rotate the button by the abutment portion without hindering movement of the button into and from the button aperture of the box. The engagement element is inserted in the channel of the box. The abutment portion is operable to move the engagement element in the channel to extend a front edge from the upper opening of the box.