The invention relates to a construction apparatus comprising a mast, a slide guided in a longitudinally displaceable manner on a front side of the mast, at least one drive chain for the slide arranged longitudinally to the mast and at least one drive pinion supported on the slide in a rotatable and drivable manner, which is engaged with the drive chain. Provision is made for the drive chain and the drive pinion to be arranged in front of the front side of the mast.

A chain-type bit-storing apparatus is provided for a CNC machine tool. The chain-type bit-storing apparatus includes a chain engaged with sprockets rotationally provided thereon. The chain includes links each includes a frame, a rotator rotationally connected to the frame, a pin for pivotally connecting the frame thereof to the rotator of another link and a socket connected to the frame and used to receive a bit. There is a pivoting unit for pivoting a selected one of the bits by pivoting a rela...

It is necessary to support components while machining is performed. In such circumstances work supports are now provided, whilst previously there was a dedicated arrangement for each component to be supported. By achieving a modularity in terms of adjustment through creating mountings comprising rings, arcs or bars secured upon posts a rigidity of presentation of support ends is achieved. By providing spacers for location about the posts on the mountings variability with regard to the positionin...

A machine tool is provided with a bit-changing apparatus including a cam, a rocker, a roller, a linkage, a pulling element, a disc and clips. The cam is attached to the machine tool. The roller is attached to the rocker and movable against the cam. The linkage includes two connecting rods each formed with an end pivotally connected to the machine tool and another end pivotally connected to the rocker. The pulling element is provided between the rocker and the machine tool so that the roller is k...

A guard for a power-feed drill having a fluid inducer protects an operator from coming in contact with a rotating drive assembly. The drive assembly is enclosed by a cylindrical housing having a slotted opening through which a fluid inducer connection extends. The guard comprises a rotatable tube concentrically disposed within the housing and sleeved over the drive assembly so as to cover the opening presented by the slot. The fluid inducer connection passes through a helical groove in the tube.

An electric impact tool in which a rotating mass rotates in a forward direction to impact upon and transfer torque to an anvil, and rotates in a reverse direction opposite the forward direction in response to such impact. A direction sensor monitors the direction of rotation of the rotating mass, and a controller turns an electric motor on and off during respective forward and reverse rotation of the rotating mass. An energy storing mechanism may be used to absorb energy from reverse rotation of...

A machine tool is provided with a bit-changing apparatus including a cam, a rocker, a roller, a linkage, a pulling element, a disc and clips. The cam is attached to the machine tool. The roller is attached to the rocker and movable against the cam. The linkage includes at least one track attached to the machine tool, a sliding element attached to another end of the rocker and movable on the track, and a connecting rod formed with an end pivotally connected to the machine tool and another end piv...

A tool pots mounting structure for a tool magazine, wherein the tool pots inside can be engaged into the engaging notches of the first and second mounting discs directly without using without any bolts, pivots or pivotal structures, and without using tools, such as power screwdriver, to assemble the tool pots. Hence, not only is the assembly process simplified, the assembly cost is reduced, but also the follow-up maintenance work is also reduced. A tool change device is disposed at one side of a...

According to a rotary clamp cylinder of this invention, in a rod cover 5, attachment holes 18 are formed so as not to intersect an axis CL of a piston rod 11, and pin members 19 are rotatably fitted in the attachment holes 18, respectively. An amount L of engagement between each pin member 19 and each turning guide groove 14 becomes greater, on the side of the axis CL of the piston rod 11 in the pin member 19 than on the side opposite to the side of the axis CL of the piston rod 11, and the oute...

A Framing Rafter Square Attachment. The attachment cooperates with a conventional rafter or framing square to make the repetitive cutting of lengths of framing lumber (such as for blocking) much easier and faster to accomplish. The attachment allows the position of the framing square as held by the attachment to be adjustable so that it can accommodate a wide variety of circular saw fence configuration. The attachment is extendable and retractable so that the attachment has both a compact size f...