Browse Prior Art Database

Friction Pen

IP.com Disclosure Number: IPCOM000042158D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Leibenguth, J: AUTHOR [+2]

Abstract

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.

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Friction Pen

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. The indicator is provided with a sector gear spring biased to the relative motion of the joint and leg. The measurement is performed as follows: First, one of the samples (sample 1) is fixed underneath the friction leg. Then, the operator pushes the friction pen vertically against the sample attached to a table. The main spring is thus compressed, and the joint 6 is engaged in the shaft. While still pushing vertically, the operator pulls the pen progressively which, due to the friction between the samples, provides relative movement between joint 6 and leg 5. The needle of the indicator will move upwards until slipping occurs, providing an indication corresponding to fs, i.e., the static friction coefficient. As the...