Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
The purpose of this device (friction pen) is to provide a quick measurement of the friction coefficients existing between two given surfaces, e.g., the surfaces of paper sheet samples. The proposed device can be described as a pipe 1 (200 mm long, 18 mm thick) comprising an indicator 2 and a friction head 3. The pipe comprises a main shaft (not shown) slidingly mounted into a main tube or handle 4. The motion of shaft with relation to the handle is spring biased (main spring not shown). The friction head comprises two main parts, i.e., a leg 5 and a joint 6. The leg and joint are slidingly mounted with relation to each other and spring biased for enabling relative movement in a direction perpendicular to the main shaft longitudinal axis.