As shearing blades of a first jaw portion, a shearing machines includes: a tip blade; a pair of first parallel shearing blades bent at an obtuse angle to the biting direction of the tip blade and disposed both sides of the blade width; and a pair of second parallel shearing blades bent at an obtuse angle to an attaching portion of the first parallel shearing blades and disposed on both sides of the blade width. As a tip blade, the shearing machine includes: a point blade a pair of tip tapered blades disposed on both sides of an end portion and whose blade width is increased toward the rear end; and a pair of tapered blades bent at an obtuse angle to an attaching portion of the rear end portion of the tip tapered blades and disposed toward the first parallel shearing blades.

A cutting head for a power tool. The cutting head comprises a pivot pin, and a first jaw and a second jaw each disposed for rotation about an axis defined by the pivot pin. The first jaw comprises a first blade mounting surface and a first ear having a first ear surface. The second jaw comprises a second blade mounting surface and a second ear having a second ear surface for rotational engagement with the first ear surface. The cutting head further comprises a first blade mounted on the first blade mounting surface and a second blade mounted on the second blade mounting surface. The first blade mounting surface, the second blade mounting surface, the first ear surface, and the second ear surface are substantially co-planar, and during a cutting action, the jaws rotate about the axis.

The invention discloses an automatic cooling and steel cutting device, which includes a casing, wherein the right end of the casing is provided with a conveying cavity, a connecting cavity and a driving cavity, the conveying cavity is provided with a conveying mechanism for pushing steel for cutting and the opening is upward, the connecting cavity is provided with a lifting mechanism for lifting the cutting part, the lower side of the connecting cavity is provided with a cutting mechanism for cutting steel. The device can cut off the steel evenly by itself when it is in use. During the cutting process, it will automatically spray water to cool down the steel and the cutter, so as to reduce the damage. After each section is cut, the cutter will automatically lift up to prepare the next section of steel cutting of wood.

The application relates to a double acting demolition device according to one embodiment for demolishing structures. The device includes a first crushing jaw for crushing operation, a first cutting jaw for cutting operation, and a combination jaw. The first jaws are separate jaws. The combination jaw is attachable to the first cutting jaw for constructing a second crushing jaw and to the first crushing jaw for constructing a second cutting jaw. The second crushing jaw is used jointly with the first crushing jaw in crushing operation and the second cutting jaw is used jointly with the first cutting jaw in cutting operation. In crushing operation, the first crushing jaw rotates around a fulcrum other than that of the second cutting jaw in cutting operation.

A separator unit suitable for being used in a cutting line of laminar materials into strips, of the type comprising an expandable shaft, a storage magazine for storing separator tools, which is operatively associated with an end of the expandable shaft, separator tools provided with ring nuts configured to allow the translation of the separator tools from the storage magazine to the expandable shaft, and vice versa, the separator tools being susceptible to being locked on the expandable shaft, and translation apparatus means configured to translate the separator tools along the expandable shaft. The separator unit provides for the expandable shaft to be provided with a first slit adapted to house a locking element with a knurling on its outwards facing surface and susceptible to translating in radial direction and provides for the ring nuts to have a counter-knurling on a length of their surfaces facing the expandable shaft. The knurling and the counter-knurling are configured to fixedly couple when the surface of the locking element is placed in contact with the surfaces of the ring nuts.

A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.

The invention relates inter alia to a method for cutting a workpiece, in particular a blank or a component, comprising the following steps: inserting the workpiece into a cutting device, wherein the cutting device comprises a first tool half having at least one workpiece holder and at least one first cutting means, which comprises a first cutting edge and a contact surface, and a second tool half having at least one second cutting means having a second cutting edge and a contact surface, clamping the workpiece by means of the workpiece holder and the contact surface of the second cutting means, cutting the workpiece by means of the cutting means, the workpiece undergoes, prior to cutting, both a first prebending, which is produced substantially in the opposite direction counter to the cutting direction, and thereafter a second prebending in the cutting direction.

A cutting head for a hydraulic power tool includes a first jaw that includes a first ear configured with a slot for receiving a corresponding ear. The second jaw includes a second ear with a third ear bore that aligns in between a first ear bore and to a second ear bore of the first ear when the second ear is coupled in the slot of the first ear. The cutting head further includes a spring-biased flange coupled to a blade mounted to the first jaw and a retained coupled at a fixed position to a blade mounted to the second jaw. The retainer is configured to receive the flange during a cutting action such that the flange prevents the blades from shifting out of alignment during the cutting action.

To provide a plate material cutting device of which thickness can be reduced and made compact. A plate material cutting device includes: a first cutting blade fixed to a housing; a second cutting blade that cuts plate material collaboratively with the first cutting blade; and a drive unit that causes the second cutting blade to reciprocally move with respect to the first cutting blade, wherein the drive unit includes: a shaft that is rotatable on a rotational axis; a first motor connected to one end portion of the shaft; a first mechanism that is capable of causing the second cutting blade to reciprocally move with respect to the first cutting blade in conjunction with rotation of the shaft on the rotational axis; and a second mechanism that is capable of supporting a load onto the shaft at a time of cutting plate material.

A hydraulic power tool includes a housing defining a cylinder, a piston at least partially positioned within the cylinder and movable between a retracted position and an extended position, a clevis supporting a head of the power tool, a nut coupled to an outer peripheral surface of the clevis, and a collar coupled to the housing and surrounding the nut to axially constrain the nut between the collar and the housing while permitting relative rotation between the collar and the nut.