Patent ID: 7721447
Filing Date: 2010-05-25
Classification: B26B

Abstract:
1. A hand-held cutter with automatic blade changer generally comprising a casing, a short blade with an aperture, a pushbutton and a plug, which is characterized in that the casing is composed of an outer casing, a fixed blade holder and a retractable blade holder, wherein a head of the fixed blade holder is disposed with a plane surface, a projection is disposed on the plane surface, and by inserting the projection into the aperture of the blade, the blade can be fixed securely on the head of the fixed blade holder; the retractable blade holder has a head and is disposed with a plane surface which faces the plane surface of the fixed blade holder, a bottom of the retractable blade holder is connected by a reset spring with a bottom or a part near a bottom of the fixed blade holder, and the plane surface of the retractable blade holder can slide on the plane surface of the fixed blade holder, the retractable blade holder can retract and restore to its original position as against the fixed blade holder by means of the reset spring; on one side of the bottom or the part near the bottom of the fixed blade holder an opening is disposed, and the pushbutton is disposed with an inserting member for connection which has a fastening block on a surface near the pushbutton, in a center of the inserting member for connection a spring is disposed, one end of the spring is exposed from the inserting member for connection, and the inserting member for connection, together with the spring, is inserted into and connected with the opening; a bottom of the outer casing is disposed with a sliding groove which has at least two positioning slots, the fixed blade holder and the retractable blade holder are entirely and completely inserted from the bottom of the outer casing into the outer casing, the inserting member for connection is partly inserted into the sliding groove, the pushbutton is exposed from the outer casing outside the sliding groove, the plug covers and closes the bottom of the outer casing, and sliding of the inserting member for connection in the sliding groove actuates the fixed blade holder and the retractable blade holder to slide in the outer casing, by means of movement of the spring the fastening block of the inserting member for connection can removably engage with the positioning slots, the fixed blade holder and the retractable blade holder can slide in the outer casing till the heads of the fixed blade holder and the retractable blade holder are exposed from a head of the outer casing; the hand-held cutter with automatic blade changer further comprising a blade changer which is divided into a blade unloading chamber and a blade loading chamber, each chamber is disposed with an inserting cavity near a top, a lower half of each inserting cavity is disposed with a stopping block, the fixed blade holder must be positioned on top and the retractable blade holder must be positioned on bottom so that the fixed blade holder and the retractable blade holder together can be inserted into the inserting cavity, and the stopping block can just block a front end of the retractable blade holder, thereby causing retraction of the retractable blade holder; the blade loading chamber is disposed with a limiting member which only allows horizontal overlapping placement of a plurality of new short blades, an end of which having the aperture is positioned near the stopping block, and the blade changer has a bottom cover which is disposed with a compression spring in position that corresponds to the new short blades, the compression spring exerts force upward against the new short blades so that a topmost new short blade is just higher than the stopping block.