Abstract: A vegetation cutting device having a housing and a motor mounted in the housing to drive a drive gear. A rotatable eccentric cam mounted on the drive gear. A reciprocating blade assembly having a first blade and a second blade, wherein the first blade is coupled to the rotatable eccentric cam and is arranged to reciprocally move when driven by the rotatable eccentric cam. A cam adjustment mechanism for varying the eccentricity of the rotatable eccentric cam with respect to the drive gear to thereby vary the distance through which the first blade moves.

Abstract: A motor-driven machine tool has a drive motor, the motor shaft of which is driven in rotation, with a tool drive shaft, which is driven in rotation or in oscillation about its longitudinal axis, and with a coupling drive for converting the rotational movement of the motor shaft into a driving movement of the tool drive shaft. Furthermore, a coupling is provided, which compensates an angular offset or change in position between the motor shaft and tool drive shaft which deviates from an axially parallel or right-angled arrangement of the two shafts.

Abstract: A jaw movement mechanism for surgical tools has improved mechanical efficiency and other advantages. The jaw movement mechanism controls the orientation and position of a movable jaw relative to a fixed jaw through a range of movement of the movable jaw. The jaws maintain a parallel orientation throughout a portion of the range of movement of the movable jaw. The jaws maintain an angular relationship throughout a portion of the range of movement of the movable jaw.

Abstract: Disclosed is a hair clipper having a moving lower blade, in which the lower blade moves so that upper and lower blades reciprocate in opposite directions and cross each other. In the hair clipper, an eccentric cam is connected to a rotary shaft of a motor installed in a main body, and an eccentric shaft formed on the eccentric cam is inserted into a fixing groove formed in an upper blade fixing plate and vibrates horizontally, the lower blade is mounted on a blade support, such that the lower blade can move horizontally, and is fixed to one end of a link, the central portion of which is fixed to the blade support, and the other end of which is fixed to the lower surface of an upper blade fixing plate, to which an upper blade is fixed, and thus, when the upper blade fixing plate vibrates horizontally by the rotation of the motor, the lower blade vibrates on the blade support by the link in the direction opposite to the vibration of the upper blade.

Abstract: A mechanism for a cutting or grinding tool for converting rotational movement into reciprocating movement contains a casing, a reciprocating member mounted within the casing for receiving and securing a tool to be inserted into a tool receiving opening of the reciprocating member, a shaft member rotatably mounted within the casing for rotation by a rotational driving force, a bearing member for rotatably carrying the shaft member, and a support member for carrying the reciprocating member for enabling reciprocating movement thereon. The reciprocating member and the shaft member are spaced apart so that a center axis of the reciprocating member and a center axis of the shaft member are offset. A connecting member is provided between the shaft member and the reciprocating member for interconnecting the shaft and reciprocating members for converting rotational movement of the shaft member into reciprocating movement of the reciprocating member.

Abstract: A cutting blade drive assembly for a hair clipper comprises a frame and a driven assembly rotatable on the frame about an axis fixed relative to the frame. The driven assembly includes a tension spring, and a cutting blade is engaged by the tension spring for reciprocal movement in response to oscillation of the drive assembly. The driven assembly also includes a mechanism for adjusting the tension in the tension spring. A drive unit on the frame operatively connects the driven assembly with an electric motor, which can also be supported on the frame, for oscillating the driven assembly about the axis to impart reciprocative movement to the cutting blade engaged by the driven assembly. The cutting blade drive assembly can be removably supported as an integral unit in the housing of a hair clipper so that the entire drive assembly may be readily removed from the housing for repair or replacement.