초록 ▼

The invention relates to a piston and cylinder unit whose piston rod is provided with a rack extending along it. The rack is in mesh with a ring of teeth (such as the teeth of a toothed belt or the teeth of a gear wheel) adapted to revolve about one axis (in the case of a gear wheel) or about at lea

The invention relates to a piston and cylinder unit whose piston rod is provided with a rack extending along it. The rack is in mesh with a ring of teeth (such as the teeth of a toothed belt or the teeth of a gear wheel) adapted to revolve about one axis (in the case of a gear wheel) or about at least two axes (in the case of a toothed belt). Such meshing engagement takes place in every position of the piston rod. When the piston rod is moved in the direction of its length the ring of teeth revolves about at least one axis and rotates a means for influencing the motion of the piston rod. Such means may for example be a liquid brake or a synchro transmitter connected with a NC unit controlling the supply of driving fluid to the piston and cylinder unit.

대표청구항 ▼

In a piston and cylinder unit having a cylinder body comprising a tube with end caps; a piston mounted for controlled axial displacement in the tube; a piston rod extending along part of the tube with a portion of the piston rod mounted to extend through one end cap externally of the body in sealing

In a piston and cylinder unit having a cylinder body comprising a tube with end caps; a piston mounted for controlled axial displacement in the tube; a piston rod extending along part of the tube with a portion of the piston rod mounted to extend through one end cap externally of the body in sealing engagement with the one end cap for axial movement relative thereto with an external end of the portion free for coupling to a power take-off; a rack having a toothed portion extending along the portion of the piston rod from a location external of the body through the one end cap into said tube part; and, a pinion gear in operative engagement with the toothed portion of the rack throughout the working stroke of the piston rod, piston rod movement control means connected with the pinion gear means to connect a supply of pressure fluid to said part of the tube, the pinion gear being mounted inside the cylinder body with the pinion gear in operative engagement with a toothed portion of the rack inside the cylinder body.