Measuring device

Claim 2

A measuring device incorporating a measuring nozzle through which a pressure medium is conveyed against the surface of an object to be measured, and another non-pneumatic measuring feeler displaceable together with said nozzle, said nozzle and measuring feeler being kept at a predetermined distance from the surface of the object to be measured by means of a control piston which is urged on the measurement nozzle side by the pressure medium feeding said nozzle and, on the opposite side by a reference pressure, wherein the control piston is located in a cylinder the length of which is such as to enable the control piston to transfer the measuring nozzle to a resting position and conversely, valve means being provided for control of the pressure condition within said cylinder and for thereby transferring the measuring device by the control piston.

Claim 3

A measuring device incorporating a measuring nozzle through which a pressure medium is conveyed against the surface of an object to be measured, and which is kept at a predetermined distance from the surface of the object to be measured by means of a control piston which is urged on the measurement nozzle side by the pressure medium feeding said nozzle and, on the opposite side by a reference pressure, wherein the control piston is located in a cylinder the length of which is such as to enable the control piston to transfer the measuring nozzle to a resting position and conversely, valve means for controlling pressure conditions within said cylinder and for thereby transferring the measuring device by the control piston, an auxiliary piston located in the cylinder on the side of the control piston remote from the measuring nozzle, said auxiliary piston being advanced towaRds the control piston when the control piston and measuring nozzle are in the measuring position.

Claim 4

A measuring device incorporating a measuring nozzle through which a pressure medium is conveyed against the surface of an object to be measured, and which is kept at a predetermined distance from the surface of the object to be measured by means of a control piston which is urged on the measurement nozzle side by the pressure medium feeding said nozzle and, on the opposite side by a reference pressure, wherein the control piston is located in a cylinder the length of which is such as to enable the control piston to transfer the measuring nozzle to a resting position and conversely, valve means for controlling pressure conditions within said cylinder and for thereby transferring the measuring device by the control piston, an auxiliary piston located in the cylinder on the side of the control piston remote from the measuring nozzle, said auxiliary piston being advanced towaRds the control piston when the control piston and measuring nozzle are in the measuring position.

Claim 5

A device according to claim 2, wherein a controllable pressure medium inlet is located between the auxiliary piston and the end of the cylinder adjacent thereto.

Claim 6

A device according to claim 2 wherein the control piston and auxiliary piston are connected by a lost motion coupling, the transfer of the control piston being at least partially effected by the auxiliary piston.

Claim 7

A device according to claim 2, wherein the auxiliary piston is drilled through out and a system of rods connecting the measurement nozzle, the control piston and a distance recorder extends slidably through the auxiliary piston and the two end walls of the cylinder.

Claim 8

A device according to claim 5, wherein the auxiliary piston has a hollow piston rod which extends slidably through the end wall of the cylinder and in contact with the auxiliary piston, and has a stop acting on the rods.

Claim 9

A device according to claim 6 wherein the piston rod carries a part of the distance recorder.

Claim 10

A device according to claim 6 wherein the piston rod is biased by a spring tending to transfer the piston to the resting position.