Mechanical stress grading of timber

Details Mechanical stress grading of timber Mechanical stress grading of timber

1980-05-06

1982-03-30

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01N 332

Patent

active

043218342

ABSTRACT:
A mechanical timber grading machine comprises inlet and outlet clamping stations for a length of timber. Each clamping station comprises a number of support and clamping rolls. Midway between the clamping stations is an oscillating station also comprising clamping and support rolls carried in a sub-frame. A push rod applies a vertical oscillating force to the sub-frame (which is carried on a swinging frame). A pair of strain guages are provided on the pushrod to detect the reaction of the timber plank. This plank is moved through the machine by causing the support rolls at the clamping stations to rotate. The oscillating forces is preferably applied at between 20 and 100 Hz. and are applied both positively and negatively.

REFERENCES:
patent: 3196672 (1965-07-01), Keller
patent: 3473371 (1969-10-01), Loeb
U.S.D.A. Forest Service General Technical Report FPL7, Machine Stress . . . Producers, 1977, pp. 51-56 and 69-79.

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