Patent ID: 8047112
Filing Date: 2011-11-01
Classification: B26D,B26F,Y10T

Abstract:
1. A hole-piercing punch for piercing paper sheets entered from an entry portion, provided with a base platform, a support platform mounted uprightly from one surface of the base platform, and a handle member that is pivotably supported by the support platform, the entry portion being formed between the base platform and the support platform, comprising: a shaft member in which the axial center position in the support platform is fixed by being inserted into a shaft hole formed in said support platform, a slot hole that is formed at one end of said handle member and has allowance of movement, into which said shaft member is inserted so as to be displaced with respect to the shaft member, a support shaft-guiding hole that is formed at the position of a tip of said handle member from said shaft hole of said support platform and has a longitudinal direction in a direction that is orthogonal to said one surface of said base platform, a support shaft that has a position fixed in said handle member by being inserted into a support hole formed in the handle member near said shaft member and at the same time near a line connecting the tip and the shaft member of said handle member, and is guided into said support shaft-guiding hole to be pressed down via the support hole as a result of pressing down the handle, and a punch member that has a blade part at one end of said one surface of said base platform and moves along with the support shaft while being held by the support shaft so as to be orthogonal to said support shaft for piercing the paper sheets entered from the entry portion, wherein the axial center of said shaft member is positioned near a perpendicular bisector of a segment connecting both ends of said support shaft-guiding hole, when the support shaft is placed on an upper edge of the support shaft-guiding hole, the blade part is above the entry portion of the paper sheets; movement of the support shaft to a bottom edge of the support-guiding hole for piercing the paper sheets causes the blade part to reach the support platform; and said slot hole moves away from said support shaft due to rotation of said handle member when said support shaft is pressed down with the guide of said support shaft-guiding hole.