Reamer for pipe
AssigneesYugen-gaisha Koito-Seisakusho, Yugen-gaisha Koito-Seimitsu, Yugen-gaisha Koito-Denki
InventorsToshio Koito, Tetsuo Koito, Miyoko Koito
Life of this patent
Estimating the term…
Abstract
A reamer includes two reamer plates overlapping with each other. On the base and tip section of these plates, there is provided an adjustable part and both plates are coupled so as to be opened and closed while centering the adjustable part on the tip section. The adjustable part on the base section has an adjusting screw, an adjusting hole, and a screw rod that passes through the adjusting hole which is situated eccentrically to the adjusting screw. The direction in which the adjusting screw is fastened is coincident with the direction in which the reamer plate is closed.
Claims9
A pipe reamer comprising a pair of reamer plates, each of said plates having a pair of end sections, pivotal means at one end section of each of said blades for pivotably mounting said pair of plates for pivotal movement in an increasing angular direction and in a decreasing angular direction, the other end section of one of said plates having a circular mounting opening, an adjusting member having a circular part rotatably disposed in said mounting opening, said adjusting member having a first part eccentrically disposed relative to said circular part, the other end section of said other plate having an adjusting hole, a clamp member justaposed to said other plate and having a second part passing into said adjusting hole, thread means on said first and second parts threadably engaging said first and second parts, said adjusting member being rotatable in said mounting opening to eccentrically displace said first part so that the threadedly engaged second part is concurrently displaced, whereby the displaced second part engages said adjusting hole to pivot said other plate relative to said first plate, said thread means being constructed such that application of an external force tending to pivot said two plates in said decreasing angular direction tightens said thread means such that said adjusting member and said clamp member increasingly wedge said two plates therebetween to thereby resist pivoting of said two plates in said decreasing angular direction.
A pipe reamer comprising a pair of reamer plates, each of said plates having a tip section and a base section, pivotal means pivotably mounting said pair of blades at said tip sections for pivotal movement in an increasing angular direction and in a decreasing angular direction, the base section of one of said plates having a circular mounting opening, an adjusting member having a circular part rotatably disposed in said mounting opening, said adjusting member having a first part eccentrically disposed relative to said circular part, said other plate having an adjusting hole, a clamp member juxtaposed to said other plate and having a second part passing into said adjusting hole, thread means on said first and second parts threadably engaging said first and second parts, said adjusting member being rotatable in said mounting opening to eccentrically displace said first part so that the threadedly engaged second part is concurrently displaced, whereby the displaced second part engages said adjusting hole to pivot said other plate relative to said first plate, said thread means being constructed such that application of an external force tending to pivot said two plates in said decreasing angular direction tightens said thread means such that said adjusting member and said clamp member increasingly wedge said two plates therebetween to thereby resist pivoting of said two plates in said decreasing angular direction.
Dependencies are inferred from the claim text.