Abstract: This invention is a kind of tubular lock with an adjustable device for two-size setting. Changing the lock into two sizes is accomplished by the two different combinations of the U-shaped hole of an inside cylinder with a projected ball of an outside cylinder and the two different combinations of the U-shaped hole of a location tube inside a dead bolt with the teeth of a moving plate.

Abstract: This auxiliary lock has a main cylinder, an extending cylinder, a linking plate, a dead bolt, an assembling plate and a fixing plate that, through the screwed notch and a fixing pin can connect selectively together in a short or long position and is therefore able to change the distance between the fixing plate and the assembling plate.

Abstract: A trumpet lock has an extending shell and a rotating shell which are disposed about a cylinder. The rotating shell and extending shell can be manipulated by a projection-and-slot arrangement into two positions, namely a short position and a long position. The trumpet lock has a dead bolt and an anti-burglar bolt which are linked by a guarding plate, linking-plate, pulling plate, and extending plate. When a door is closed, the anti-burglar bolt is pushed into the shell and remains there so as to prevent entry of the dead bolt into the shell by the obstruction of the guarding plate against the rear portion of the dead bolt.

Abstract: An opening device for simultaneously opening two locks of a double-locked door fixed only at the inside of the door for simplifying the action of opening from the inside comprises a cam-operated sliding plate displaceable by a cam actuator on the shaft of the main lock-rotating handle which when displaced simultaneously rotates the shaft of the auxiliary lock by camming action to the unlocked position, but when opening the door from the outside the device does not unlock both locks simultaneously and the opening process requires two separate operations for preserving the anti-burglary features of a normal double-lock system.

Abstract: This invention concerns about a tubular door lock which makes use of humps attached on a cylinder for guiding and restricting the movement of a rotating shell and an extending shell enabling assembling plates hooked with the bottom of the extending shell to alter the position of the center of a fan-shaped gear on it so that the teeth of the fan-shaped gear can engage with those of the dead bolt to make up an action of pulling the dead bolt back.

Abstract: This invention relates to an auxiliary lock which has a base, a rotating shell, and an extending shell that, through the hooks, grooves, and notches disposed thereon, can connect selectively together in a short or long position and is therefore able to change the distance between a rotating member and the faceplate of the lock via adjustment of the rotating shell.