Max Co., Ltd.

Katsuhisa Yata

Makoto Abe

Hirokazu Arai

Nobuo Kishi

Hiroaki Ohmae

Projected portions 17, 18, 19 are formed at three positions in the middle and on left and right ends of the front surface of a driver 13 of a staple hammer. The width of the projected portion 18 in the middle is smaller than the distance between both leg portions S.sub.3, S.sub.4 of a staple S, and the projected portion 18 is not in contact with the upper surfaces of bends S.sub.1, S.sub.2 of the staple S. Further, the distance between the projected portions 17, 19 on both left and right ends is slightly smaller than the total width of the staple S. The projected portions 17, 19 are located above the bends with radii, and are not in contact with the bends. At the time of hammering, the projected portion 18 in the middle impinges the middle portion of the top surface of the staple S, allowing both leg portions S.sub.3, S.sub.4 of the staple S to ground upon the object to be hammered so as to be expanded. At the time of penetration of the leg portions, the leg portions completely penetrate into the object to be hammered with the projected portions 17, 19 on both left and right ends contacting the bends.

Growing community of inventors

Tokyo, Japan

Katsuhisa Yata