Abstract: A security lock comprising a tube having inner and outer ends and a passage extending between such ends, and a shaft including first and second shaft sections interconnected for pivotal movement relative to each other. The shaft has inner and outer end portions. The shaft has a first position in which it is received in the passage of the tube with the inner end portion of the shaft projecting beyond the inner end portion of the tube. A latch which includes the inner end portion of the shaft releasably locks the shaft in the first position so that upon release of the latch, the shaft can move toward the outer end of the tube.