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A stepping type expansion bolt extracting gun, making use of a shifting mechanism to shift a gun barrel by means of a stepping operation, and an arresting and releasing mechanism to prevent the gun barrel from returning. A check plate is provided to control the gun barrel to shift back to the origin

A stepping type expansion bolt extracting gun, making use of a shifting mechanism to shift a gun barrel by means of a stepping operation, and an arresting and releasing mechanism to prevent the gun barrel from returning. A check plate is provided to control the gun barrel to shift back to the original position. By means of said arrangement, the present invention is applicable to extract the live spindle of an expansion bolt in a labor-saving and most efficient way to replace the linking rod type actuation of the prior art.

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A stepping type expansion bolt extracting gun, comprising: a gun holder, comprised of a sliding seat, first slot, second slot, and thrid slot respectively arranged from the front, and a fixed handle extended downward from the rear end of the gun holder, said sliding seat having a notch at the front,

A stepping type expansion bolt extracting gun, comprising: a gun holder, comprised of a sliding seat, first slot, second slot, and thrid slot respectively arranged from the front, and a fixed handle extended downward from the rear end of the gun holder, said sliding seat having a notch at the front, a partition being arranged between the first slot and the second slot, another partition being arranged between the second slot and the third slot, said two partitions and the back slide surrounding wall of the gun holder being arranged to provide a respective circular hole to aim at one another; a cylindrical gun barrel slidable through the circular holes of said partitions and the back side surrounding wall; a shifting mechanism, comprised of a movable handle, a shifting plate, a spring, and a locating pin, said movable handle having a forked top end fixed in the third slot by pivotal joint with the lower end flexibly arranged to move toward said fixed handle, said shifting plate being arranged to provide a flat plate-shaped configuration and positioned in the third slot with the lower portion being in contact with said movable handle, having a circular hole at the center for penetration of said gun barrel therethrough, as the movable handle is forced to move toward the fixed handle the lower portion of the shifting plate is forced to incline so as to permit the rhombic angle of the front upper edge and the rear lower edge of the circular hole of the shifting plate to engage the gun barrel to move backward, said spring being mounted on the gun barrel by a slip joint, and arranged in the third slot between the shifting plate and the back side surrounding wall to provide the shifting plate with a forward push and to permit the movable handle to return to an original position, said locating pin being positioned in the third slot of the gun holder to prohibit the upper portion of the shifting plate from moving forward and to permit the shifting plate to be arranged at vertical position against the gun barrel when it is released from the control of the movable handle, so as to permit the gun barrel to freely slide through the circular hole of the shifting plate; an arresting and releasing mechanism comprised of a check plate, a spring, and a locating pin, said check plate being allocated in the second slot and arranged to have a prolonged configuration comprising a circular hole for penetration of the gun barrel therethrough, with the lower portion of the check plate extending downwardly to protrude beyond the gun holder to a position at the front side of the movable handle, said spring being mounted on the gun barrel and positioned in the second slot at the back side of the check plate to provide the check plate with a forward force, said locating pin being transversely allocated in the second slot and arranged at the front of the check plate to permit the check plate to be forced to incline outward, by means of the engagement of the rhombic angle of the front lower edge and the rear upper edge of the circular hole with the gun barrel, the gun barrel being restrained from moving ahead, at the time to release the gun barrel and to let the gun barrel be moved forward, the lower end of the check plate being pulled backward to the released position to permit the check plate to be in a vertical position against the gun barrel, the gun barrel being released to slide through the circular hole of the check plate; a trip plate being arranged to slide in the sliding seat comprising a notch at the front for the head of the live spindle of the expansion bolt to hang thereup and to be retained thereabout, the rear end of the trip plate being fixedly attached to the front end of the gun barrel to follow the gun barrel to slide in the sliding seat; a return spring is mounted on the gun barrel and positioned in the first slot between the trip plate and the partition to provide the trip plate and the connected gun barrel with a forwarding force at the time the check plate is moved to the releasing position; and a stop block being fixedly arranged at the front of the sliding seat, comprising a notch at the front to stop the rear end protruding portion of the expansion bolt; the component parts form the expansion bolt extracting gun, including the shifting mechanism for extracting the live spindle of the expansion bolt through a stepping operation, and by means of the arresting and releasing mechanism to permit the gun barrel and the trip plate to automatically return to the original position.