Ratchet bar push structure of grease gun

Abstract

A ratchet bar push structure of grease gun includes a gun body and a grease storage section. A ratchet bar is slidably disposed in the gun body and reciprocally movable as a piston to dispense grease supplied by the grease storage section out of the gun body. A pad section is movably disposed between the ratchet bar and a push member for pushing the ratchet bar as a force transmission unit. A user can change the position of the pad section to control whether an action force of the push member is transmitted to the ratchet bar. When the pad section is positioned in a padded position, the external force is applied to the ratchet bar via the pad section to push the ratchet bar. When positioned in a released position, the force transmission path is interrupted, whereby the ratchet bar will not be pushed by the push member.

1 . A ratchet bar push structure of grease gun, comprising:
 a gun body;   a grease storage section for storing grease;   a fitting section disposed in the gun body and having at least one cylindrical piston chamber, the fitting section being formed with an incoming flow passage in communication with one side of the piston chamber, the incoming flow passage being spaced from one end of the piston chamber for communicating the grease storage section with the piston chamber;   a ratchet bar coaxially slidably disposed in the piston chamber, the ratchet bar having a diameter equal to an inner diameter of the piston chamber; and   a push member connected to one end of the ratchet bar, which end extends out of the piston chamber for pushing the ratchet bar to axially move within the piston chamber, the ratchet bar push structure being characterized in that the push member has an end section and a slide section positioned between the end section and the end of the ratchet bar, whereby the ratchet bar is slidable along the slide section relative to the end section, the ratchet bar push structure further comprising a pad section movable between a padded position and a released position, when positioned in the padded position, the pad section being positioned between the end of the ratchet bar and the end section, whereby when an external force is applied to the end section, the end section can push the ratchet bar via the pad section and make the ratchet bar synchronously move with the end section, when positioned in the released position, the pad section releasing the end of the ratchet bar, whereby the ratchet bar can slide along the slide section relative to the end section without being pushed by the end section.   
     
     
         2 . The ratchet bar push structure of the grease gun as claimed in  claim 1 , wherein the slide section has a slide rod, one end of the slide rod being fixedly connected to the end section, the end of the ratchet bar being formed with a slide socket inward axially extending from the end of the ratchet bar by a certain depth, the slide rod being coaxially slidable fitted in the slide socket. 
     
     
         3 . The ratchet bar push structure of the grease gun as claimed in  claim 2 , wherein the ratchet bar has a main bar body, the main bar body having a diameter equal to the inner diameter of the piston chamber, an end piece with a noncircular cross section being fixedly connected to an end of the main bar body, the end piece extending from the end of the main bar body along an axis of the main bar body, the end piece having a minimum outer diameter smaller than the diameter of the main bar body. 
     
     
         4 . The ratchet bar push structure of the grease gun as claimed in  claim 3 , wherein the pad section is a block body, one face of the block body being attached to the end section, the block body being rotatably connected with the slide rod, whereby the block body is rotatable around an axis of the slide rod between the padded position and the released position, the other face of the block body being recessed to form a receiving space with a shape complementary to the cross-sectional shape of the end piece, the receiving space inward extending from the other face of the block body by a certain depth, whereby when the block body is positioned in the released position, an opening of the receiving space correspondingly complementarily faces the end piece, permitting the end piece to slide through the opening of the receiving space into the receiving space, while when the block body is positioned in the padded position, the opening of the receiving space crosses a free end of the end piece so that the end piece cannot be slid into the receiving space through the opening thereof and an end face of the free end of the end piece abuts against the other face of the block body. 
     
     
         5 . The ratchet bar push structure of the grease gun as claimed in  claim 4 , wherein the end piece has a substantially rectangular cross section and the receiving space has the form of a notch corresponding to the end piece. 
     
     
         6 . The ratchet bar push structure of the grease gun as claimed in  claim 4 , wherein the end section of the push member is formed with a notch and the pad section has a first extension section outward extending from the block body across into the notch. 
     
     
         7 . The ratchet bar push structure of the grease gun as claimed in  claim 6 , wherein the pad section further has a second extension section outward extending from the first extension section.