Hammer sideplate tightening mechanism
A method for tightening or loosening components of a hammer assembly is comprises inserting a tool into an aperture defined by at least one component of the hammer assembly in order to engage the drive structure of a tensioning member, moving the drive structure of the tensioning member, and moving at least one draw member operatively associated with the tensioning member.
1. A hammer assembly comprising:
a first sideplate defining a first side aperture;
a second sideplate defining a second side aperture;
a powercell assembly disposed between the first sideplate and the second sideplate defining a bore extending through the assembly that is in communication with the first and second side apertures, the assembly also defining an access aperture that is in communication with the bore; and
a tightening mechanism operationally associated with the first and second sideplates, said mechanism being configured to tighten or loosen the sideplates around the powercell, the mechanism being disposed in the bore of the powercell assembly;
wherein the tightening mechanism includes a first draw member, a second draw member and a tensioning member interfacing with the first draw member and the second draw member;
the first draw member includes a flange and a shaft defining a first aperture and including left handed internal threads disposed in the first aperture,
the second draw member includes a flange and a shaft defining a second aperture and including right handed internal threads disposed in the second aperture, and
the tensioning member includes a first end portion including right handed external threads mating with the right handed internal threads of the second aperture of the shaft of the second draw member, a second end portion including left handed external threads mating with the left handed internal threads of the first aperture of the first draw member, and a center drive portion disposed between the first and second end portions being positioned in the access aperture; and
the flange of the first draw member and the flange of the second draw member are flat plate portions and at least one of the first side aperture and second side aperture define a first anti-rotation feature and at least one of the flange of the first draw member, the flange of the second draw member, the shaft of the first draw member and the shaft of the second draw member includes a second anti-rotation feature mating with the first anti-rotation feature, the first anti-rotation feature being a keyway and the second anti-rotation feature being a key extending from the flange of the first draw member or the flange of the second draw member.
2. The hammer assembly of claim 1 wherein the center drive portion includes a hexagonal drive structure.
3. The hammer assembly of claim 1 wherein the first end portion, the center drive portion and the second end portion are integrally formed as part of a single component, and the first sideplate and the second sideplate define a slot therebetween, and the center drive portion is disposed in the slot, and the flange of the first draw member defines an enclosed end for the first draw member and the flange of the second draw member defines an enclosed end for the second draw member.
4. The hammer assembly of claim 3 wherein the first draw member and second draw member are identically externally configured.