Patent ID: 7047655

Claim:
A carpenter's square comprising: a blade and a handle, rotatable relative to each other around a pivot axis; and a snap locking angle adjustable device including: a first contacting element having a first alignment structure that rotates rigidly with the blade around the pivot axis; a second contacting element having complementary first alignment structure that rotates rigidly with the handle around the pivot axis; and a spring that, in conjunction with a spring expansion-restricting device, presses the first alignment structure axially against the complementary first alignment structure; wherein: the first alignment structure and the complementary first alignment structure align at certain angles between the blade and the handle, at which the spring force is reduced compared to at angles where they do not align; the spring expansion-restricting device comprises position-limiting members, in between which the spring and the contacting elements are placed, rigidly held together by connecting structure, and each one of the contacting elements with its alignment structure is a single unit formed by a moulding technique.