User-Friendly High Capacity Jaw for Evaluating Materials
Publication Date: 2005-Sep-06
The IP.com Prior Art Database
Development of some consumer products requires proper evaluation of the material properties of many fabrics and webs using test devices for tensile strength and other properties. To improve some aspects of testing, we discuss a new high-capacity tensile clamp that allows the user to easily load specimens into the jaw faces allowing an accurate assessment of the material being tested.
User-Friendly High Capacity Jaw for Evaluating Materials F. Fritz Kromenaker Kimberly-Clark Corporation
Neenah, WI 54956
For Kimberly-Clark Corporation, proper evaluation of cloth, cloth-like, elastic, gathered type materials, and fastening systems is important. This is especially true given the emergence of technology providing stronger, softer and more elastic materials and improved fastening systems.
Discussed in this document is a high capacity tensile clamp that allows the user to easily load specimens into the jaw faces allowing an accurate assessment of the material being tested.
Implications and uses
The typical industrial high capacity grip clamp is in a shape of a "C" as viewed from the side and is shown below. These clamps are good for testing semi-rigid or rigid materials that allow them to be fed into the upper clamp and placed into the lower clamp. With soft pliable type materials or elastic gathered type materials it is extremely difficult to consistently and accurately place the material into the upper and lower clamp. Fastening systems that incorporate soft pliable materials are also difficult to properly mount into the clamps.
Instrument design and function
In designing an improved clamp, it is desirable for the user to easily place the specimen within the jaw faces and to do so accurately. Specimens to be mounted parallel to the clamps and neither twisted nor skewed. The improved clamp allows the user to insert the specimen from the side; the user holds the specimen above and below the jaw face as the specimen is placed into the clamp. This allows the user to easily align the specimen to a mark, a line, or visually align the specimens with the top jaw face. This is then repeated for the bottom jaw face. Or the operator can hold the specimen on the top and the bottom and move the specimen into the clamps. In either case, the improved clamp simplifies placing the specimen in the jaw face. Another feature of this specimen clamp is that the specimen entry can be changed from left to right due to the symmetry of the clamp.
By design, the jaw faces can be easily exchanged without removing the jaw clamp from the tensile frame. This facilitates tests for various materials and jaw face configurations such as line contact faces, interlocking faces, rubber to rubber, various patterned faces, or combinations thereof.
As shown in Figure 2, the upper clamp has a top mount bracket that attaches to the load cell. This configuration can vary among load frames. This design allows the clamps to be easily changed to other configurations, by loosening the screw and putting on another suitable adapter. The U-shaped hoop is the essential feature of the improved clamp. The U-shape allows the user's hand to hold the material as it enters...