Locking random orbital dual-action head assembly with centering

Abstract

A removable head assembly for a combination rotary, including: a body; a rotatable element connected to the body and including an indentation or protrusion for fixing a pad assembly to the rotatable element; and a locking assembly including first and second elements. The body is connectable to a combination rotary tool and is rotatable about a first axis; the rotatable element is rotatable about a second axis; the indentation or protrusion is aligned with a third axis substantially parallel to the second axis; and the first element is displaceable to displace the second element to rotationally fix the rotatable element with respect to the body so that the first and third axes are co-linear, and the second axis is out of alignment with the first and third axes.

1 . A removable head assembly for a rotary tool, comprising:
 a body arranged for connection to a drive means for a rotary tool and including first and second openings;   a rotatable element connected to the body and including an indentation or protrusion for fixing a pad assembly to the rotatable element; and,   a locking assembly with first and second elements, wherein:
 the body is rotatable about a first axis with respect to the drive means; 
 the rotatable element is rotatable about a second axis substantially parallel to the first axis; 
 the indentation or protrusion is aligned with a third axis substantially parallel to the first axis; 
 the second element includes first and second longitudinal ends extendable beyond an outer surface for the body; 
 the second element is displaceable through the first and second openings in the body; 
 the second element is displaceable to displace the first element; and, 
 the displacement of the first element is along a straight line to rotationally lock the rotatable element with respect to the body so that the first and third axes are co-linear. 
   
   
   
       2 . The removable head assembly as recited in  claim 1 , wherein:
 The locking assembly further comprises an elastically deformable element arranged to urge said first element in a first direction; and,   said second element is engageable with said first element to urge said first element in a second direction, opposite said first direction, to lock said rotatable element with said body.   
   
   
       3 . The removable head assembly as recited in  claim 1 , wherein said rotatable element further comprises at least one receiving feature engageable with said first element. 
   
   
       4 . The removable head assembly as recited in  claim 1 , further comprising a coupling for detachably securing said head assembly to a rotary tool. 
   
   
       5 . The removable head assembly as recited in  claim 1 , further comprising a counterbalance secured to said body. 
   
   
       6 . A combination rotary tool and removable head assembly, comprising:
 a rotary tool having a handle and a drive shaft; and,   a head assembly detachably secured to said rotary tool, comprising:
 a body connected to said drive means and including a bore through the body, said drive shaft rotatable about a first axis; 
 a rotatable element connected to the body and including an indentation or protrusion for fixing a pad assembly to the rotatable element, said rotatable element rotatable about a second axis disposed substantially parallel to said first axis; and, 
 a locking assembly including first and second elements, wherein:
 the second element is disposed in the bore: 
 the second element includes first and second longitudinal ends extendable beyond an outer surface of the body; 
 the second element is displaceable in the bore to displace the first element; 
 the indentation or protrusion is aligned with a third axis substantially parallel to the first axis; and, 
 the displacement of the first element is along a straight line to rotationally lock the rotatable element with respect to the body so that the first and third axes are co-linear. 
 
   
   
   
       7 . A removable head assembly for a combination rotary, comprising:
 a body;   a rotatable element connected to the body and including an indentation or protrusion for fixing a pad assembly to the rotatable element; and,   a locking assembly including first and second elements, wherein:
 the body is connectable to a combination rotary tool and is rotatable about a first axis; 
 the rotatable element is rotatable about a second axis; 
 the indentation or protrusion is aligned with a third axis substantially parallel to the second axis; and, 
 the first element is displaceable to displace the second element to rotationally fix the rotatable element with respect to the body so that the first and third axes are co-linear, and the second axis is out of alignment with the first and third axes. 
   
   
   
       8 . The head assembly of  claim 7  further comprising:
 at least one bushing counterweight attached to the body for counteracting vibration forces parallel to the first axis; and,   a respective counterweight attached to each of the at least one bushing counterweights for counteracting vibration forces orthogonal to the first axis.   
   
   
       9 . A removable head assembly for a combination rotary tool, comprising:
 a body including a through-bore and a channel connected to the through-bore, the channel substantially orthogonal to the through-bore;   a rotatable element connected to the body and including an indentation or protrusion for fixing a pad assembly to the rotatable element; and,   a locking assembly including a first element at least partly disposed in the through-bore and a second element at least partly disposed in the channel, wherein:
 the body is connectable to a combination rotary tool and is rotatable about a first axis; 
 the rotatable element is rotatable about a second axis; 
 the indentation or protrusion is aligned with a third axis substantially parallel to the first axis; and, 
 the first element is displaceable in the through-bore to displace the second element in the channel to rotationally fix the rotatable element with respect to the body so that the first and third axes are co-linear, and the second axis is out of alignment with the first and third axes. 
   
   
   
       10 . The head assembly of  claim 9  wherein:
 the rotatable element includes at least one opening;   the at least one opening is for engaging the second element to rotationally fix the body and the rotating element with respect to each other.