US 4,903,408 AGranted

Steel plate cutter

AssigneeSangojuuki Co., Ltd.

InventorsItsuo Tagawa, Samon Kanno

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Abstract

A steel plate cutter has a pair of stationary arms arranged with a predetermined gap therebetween, and a movable arm arranged between the stationary arms. An intermediate portion of the movable arm is pivotally supported by the stationary arms. Stationary and movable ends of a hydraulic cylinder are pivotally coupled to the proximal ends of the stationary arms and the movable arm. A pair of base blades that oppose a shearing push blade fixed to the distal end of the movable arm are fixed on the distal ends of the stationary arms. When the movable arm is driven by the hydraulic cylinder to approach and separate from the stationary arms, the shearing push blade of the movable arm enters or escapes from the gap between the base blades of the stationary arms. When the shearing push blade slides between the base blades, it cuts a steel plate in a belt-like strip by coaction with the base blades by a shearing force. The cut strip of the steel plate is bent in a direction away from the steel plate. Therefore, a belt-like space, in which and from which the movable arm can enter and escape, is formed in the steel plate by every cutting operation. When a single cutting operation is completed, the steel plate cutter can smoothly move on the steel plate along the belt-like space while the movable arm faces the belt-like space. As a result, the cutting operation can be easily repeated, and the steel plate can be safely and efficiently cut.

A steel plate cutter, comprising:

a stationary arm having a pair of arm members arranged with a predetermined gap therebetween;
a movable arm arranged between said arm members and pivotally supported at an intermediate portion thereof by said arm members;
a hydraulic cylinder, having a piston rod capable of moving forward and backward, for driving said movable arm to approach and separate from said stationary arm, said cylinder having a stationary end pivotally coupled to proximal ends of said arm members, said piston rod having a distal end pivotally coupled to a proximal end of said movable arm;
a shearing push blade fixed to distal ends of said arm;
a pair of base blades fitted to distal ends of said arm members to oppose said shearing push blade, wherein said shearing push blade is capable of entering and escaping from a space between said base blades and, upon sliding between said base blades, cuts a steel plate in a belt-like manner by a shearing force together with said base blades;
and
a bracket member for mounting said steel plate cutter on a construction machine, an arm mounting member on which said stationary arm is fixed, and a flexible joint for mounting said arm mounting member on said bracket member to be capable of pivoting wherein said flexible joint comprises a shaft member having one end fixed to either said arm mounting member or said bracket member and the other end having a first coupling portion and spring means provided between said arm mounting member and said bracket member and arranged around said shaft member,
said first coupling portion of said shaft member being coupled to a second coupling portion formed on the remaining one of said arm mounting member and said bracket member to be capable of pivoting and
one of said first and second coupling portions comprising a spherical coupling member, a spherical hole fitted with said spherical coupling member being formed in the remaining one of said coupling portions.

6 more elements

Abstract

Claims14