Abstract: A pneumatic jack for electric welding comprises a cylinder which houses a piston the connecting rod of which is connectable with an electrode. The piston rod is movable between a retracted and an extended position and at the closed end of the cylinder an electric switch is located in a recess and is embedded in electrically insulating material. The switch is provided with an operating rod which extends into a passage effecting communication between the bottom of the recess and the interior of the cylinder and which operates the switch when the piston in the cylinder is in the retracted position thereof.

Abstract: Device for storing and paying out automatically a predetermined length of webbing, for example of a safety belt, and also for causing the voluntary or automatic instantaneous locking thereof, said webbing being essentially passed around wedge and pulley means within a case containing a return sandow. In the release position pulling the webbing will pay out the stored webbing as desired, thus tensioning the band which will tend to produce the reverse movement, i.e. the storage of the webbing. The voluntary or automatic locking of the webbing in all positions is obtained by causing the movement of a movable member adapted to wedge said webbing in relation to said case.