Abstract: A locking bar for blocking relative movement of movable parts of a device, particularly providing anti-theft nature to devices such as wheelchairs which would probably be manipulated to a collapsed condition as an incident to a theft of the device; and anti-theft nature is especially provided by the locking bar made to appear to be merely a non-removable axle, yet made shortenable for removal, and thus chair-collapsability by authorized personnel, by an internal sliding operativity which is concealed but which achieves length-changing be engagement of screw-threaded parts to permit manual torque-application to movable parts to achieve the length-changing, the sliding member being a socket whose sliding into or from its length-changed position is effected merely by tilting to achieve positioning by gravity.

Abstract: Apparatus for desoldering, characterized by its suction and pressure effects being achieved by the stroking of a piston in an air cylinder. In the preferred embodiment, the suction effect for drawing in melted solder is forced by a spring, with venting of the pressure previously existing; and the pressure effect for ejecting the melted solder is by the reverse direction stroke of the piston, which not only causes the piston-stroke to pressurize the control tube but to impart energy to the spring for its subsequent suction-stroke operativity.