Portable marking tool

Abstract

Abstract The portable marking tool has a head member with an axial bore therethrough. An anvil extends through the bore and has an outer end portion with marking devices thereon. An actuator member connected to a source of fluid under pressure is positioned in spaced relation to the head member and has a fluid actuated piston rod assembly movable longitudinally therein. A tubular connecting member is secured at one end to the head member and at the other end to the actuator member. Positioned within the tubular connector member is a striking tool that includes a longitudinally movable body portion coaxially positioned on a tubular support member. The support member has one end portion secured to the head member with an end portion of the anvil extending into the axial bore of the support member. The support member has a plurality of apertures arranged circumferentially therein and forming a ball cage for the locking balls. An annular ring member is positioned between the support member and striking tool body portion and has a plurality of recessed portions for receiving portions of the balls positioned in the ball cage of the support member. The annular ring member is arranged to move toward the head member by an inwardly extending shoulder on the body portion and away from the head member by a return spring positioned around the support member. A hammer member is positioned within the striking tool body portion and has an enlarged head portion urged against an inwardly extending shoulder of the body portion by a spring member. The hammer member has an end portion extending into the tubular support member. The hammer member end portion has an annular recessed portion in which portions of the balls in the support member ball cage extend to lock the hammer member in a retracted position. The actuator member supplied with fluid under pressure is arranged to move the actuator piston into abutting relation with the upper surface of the striking tool body portion and move the body portion toward the head member. As the body portion moves toward the head member the hammer remains locked in a rearward position by the balls in the support member ball cage and in the annular recessed portion of the hammer. As the striking tool body portion moves toward the head member a striking spring within the body portion is compressed and exerts a force against the hammer member. When an inwardly extending shoulder of the body portion abuts the annular end portion of the annular ring, the annular ring moves with the body portion to position the annular spring recessed portions in underlying relation with the apertures of the ball cage of the support member so that the balls move radially outwardly in the ball cage and release the hammer member. As the annular ring member recessed portions move into underlying relation with the apertures in the ball cage, the lower edge of the striking tool body portion moves into abutting relation with the end wall of the head member. The hammer member released by the locking device moves longitudinally in the support member and strikes the anvil member. The striking force of the hammer member is transferred to the anvil member and the marking device connected thereto. The striking force imparted to the marking device impresses a mark in the surface of the object without exerting a substantial external force on the marking tool.

Inventors

• 👤 E Speicher

Bibliographic Details