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the notches forming a throat while the oppo- site notch has an approximately tangential arrangement,..the longitudinal edges of the second mentioned notch each terminating in] 5 an abutment and being parallel and of V form, the base of the notch being oppositely inclined and a depression being formed in one, of the before mentioned longitudinal edges, and a detachable saw tooth comprising a 10 shank received within the notch and shoul- ders engaging the before mentioned abut- ments, the edges of the shank having an inter- locking connection with the V shape edges of the notch and the inner end of the shank 15 being bifurcated to form spring arms, the
extremity of the shank being oppositely in- clined whereby the spring arms are positively forced apart when the end of the shank im- pinges against the oppositely inclined base of the notch, one of the spring arms carrying a 20 projection designed to enter the before men- tioned depression in one of the longitudinal edges of the notch when the tooth is inserted in position within the notch. In testimony whereof I affix my signature 25 'in-presence of two witnesses. WILLIAM II. ASKINS. [L. S.] Witnesses: W. G. GARRISON, JNO. CODELL.