Lockset and door lock

A lockset, comprising:

• a drive shaft, wherein two ends of the drive shaft are respectively connected to a first handle assembly and a second handle assembly;
• each of the first handle assembly and the second handle assembly comprises a handle and a lock seat;
• a linkage mechanism is provided between the handle of the first handle assembly and the drive shaft, and the linkage mechanism is configured to lock the handle and the drive shaft such that the handle and the drive shaft are circumferentially fixed;
• the second handle assembly is provided with a switch mechanism for driving the linkage mechanism to lock or unlock;
• and when the switch mechanism drives the linkage mechanism to unlock, the handle is rotatable independently relative to the drive shaft;
• wherein the linkage mechanism comprises a rotating sleeve and a limit element, wherein the rotating sleeve and the limit element are movable to approach each other to be clamped for fixation;
• the handle is provided with a connection part and a grip part;
• an end of the connection part is provided with a mounting chamber;
• the rotating sleeve is axially fixed in the mounting chamber and rotatable circumferentially relative to the mounting chamber;
• the limit element is circumferentially fixed in the mounting chamber and driven by the switch mechanism to move to approach the rotating sleeve along a centerline of the mounting chamber;
• and the drive shaft and the rotating sleeve are fixed circumferentially;
• wherein the switch mechanism comprises a single connection rod and a button assembly;
• the button assembly is fixed to the second handle assembly;
• the drive shaft is tubular;
• the connection rod passes through an inner side of the drive shaft;
• a first end of the connection rod is connected to the button assembly, and a second end of the connection rod passes through the rotating sleeve and is abutted against the limit element;
• the button assembly is configured to drive the connection rod to rotate or move to push the limit element away from the rotating sleeve;
• and a reset spring is provided at a side of the limit element away from the connection rod for resetting the limit element;
• the second end of the connection rod forms an abutment part that protrudes circumferentially;
• the limit element is provided with a recessed part;
• the recessed part is provided with a curved surface;
• the abutment part is abutted against the curved surface;
• and when the connection rod rotates, the abutment part moves along the curved surface to allow the limit element to move along the centerline of the mounting chamber;
• and
• a highest point of the recessed part is connected to a platform, and a shallow slot is provided on the platform;
• the abutment part is configured to be inserted into the shallow slot after moving along the curved surface to the platform.