Patent ID: 7475493

Claim:
A calliper-type instrument ( 1 ) for measuring the diameters of trees, comprising a straightedge ( 2 ) on which there is disposed a first leg or jaw ( 3 ) and a second leg or jaw ( 4 ), wherein the instrument includes a recording unit ( 5 ) which is placed on the first leg ( 3 ) and which is adapted to store and record measured tree diameters, wherein the first leg ( 3 ) is fixedly placed along the straightedge ( 2 ) and wherein the second leg ( 4 ) projects out from a slide ( 6 ) that can be displaced along the straightedge ( 2 ), wherein the legs ( 3 , 4 ) and the straightedge are located in mutually the same plane, wherein the legs ( 3 , 4 ) can be folded in said plane, and wherein the second leg ( 4 ) is pivotally mounted to the slide ( 6 ), characterized in that the first leg ( 3 ) is pivotally mounted to an attachment ( 7 ) on the straightedge ( 2 ); in that the first leg ( 3 ) is provided with a first fastener means ( 8 ) which is intended to hook into said attachment ( 7 ); in that the second leg ( 4 ) is provided with a second fastener means ( 9 ) which is intended to hook into the slide ( 6 ); in that the when the legs ( 3 , 4 ) are in their outwardly extended positions said legs will be mutually parallel and perpendicular to the straightedge; in that the first fastener means ( 8 ) and the second fastener means ( 9 ) include a hook-in part ( 10 ) placed on respective legs; in that a first opening ( 1 Ia) and second opening ( 1 Ib) are placed respectively in the attachment ( 7 ) and in the slide ( 6 ) with which the hook-in part ( 10 ) is intended to co-act; and in that the fastener means ( 8 , 9 ) are placed from the straightedge ( 2 ) by a distance equalling at least to 1/5 of the length of respective legs ( 3 , 4 ).