The original type of lock used in England and Ireland it is of a basic design originally of a very stiff lever and a bolt with wards being the block. As wards were outdated in the centre of the key it became normal for them to be placed on the sides of the bit. Although today they are still produced they are mostly for internal doors and are not used for high security. Older ones could be as large as 40cm by 25cm.
WIPO ASSIGNS PATENT TO MASUNAGA OPTICAL MFG. FOR "RIM LOCK STRUCTURE OF EYEGLASS FRAME AND METHOD FOR MANUFACTURING THE SAME" (JAPANESE INVENTOR)
Jan 21, 2011; GENEVA, Jan. 21 -- Publication No. WO/2011/007421 was published on Jan. 20. Title of the invention: "RIM LOCK STRUCTURE OF...