Pivot assembly

Abstract

A pivot assembly has a pivot support member with a keyway. The keyway has two oppositely directed longer keyway wings extending from a middle section and the middle section has two oppositely directed shorter keyway wings extending in a direction transverse to that of the longer keyway wings. The shorter keyway wings have convexly radiused ends. The pivot assembly also has a pivot with an attachment portion and a key projecting rearwardly from the attachment portion. The key has a rearward section with oppositely directed longer key wings which are longer than the shorter keyway wings but sufficiently short to allow the longer key wings to pass through the keyway. The key also has a middle section between the rearward section and the attachment portion. The middle section has oppositely directed shorter key wings with convexly radiused ends. The shorter key wings extend in a direction aligned with that of the longer key wings. The shorter key wings have a length substantially matching that of a length of the shorter keyway wings. The radiused end of each shorter key wing has a radius substantially matching a radius of a radiused end of each of the shorter keyway wings such that the shorter key wings fit with a close tolerance between ends of the keyway shorter wings.

1 . A pivot assembly comprising:
 a pivot support member having a keyway, said keyway having two oppositely directed longer keyway wings extending from a middle section, said middle section having two oppositely directed shorter keyway wings extending in a direction transverse to that of said longer keyway wings, said shorter keyway wings having convexly radiused ends; and   a pivot having an attachment portion and a key projecting rearwardly from said attachment portion, said key having a rearward section with oppositely directed longer key wings which are longer than said shorter keyway wings but sufficiently short to allow said longer key wings to pass through said keyway and a middle section between said rearward section and said attachment portion, said middle section having oppositely directed shorter key wings having convexly radiused ends, said shorter key wings extending in a direction aligned with that of said longer key wings, said shorter key wings having a length substantially matching that of a length of said shorter keyway wings and each shorter key wing radiused end having a radius substantially matching a radius of a radiused end of each of said shorter keyway wings such that said shorter key wings fit with a close tolerance between ends of said keyway shorter wings.   
   
   
       2 . The pivot assembly of  claim 1  wherein said pivot support has a thickness substantially matching a thickness of said middle section of said pivot. 
   
   
       3 . The pivot assembly of  claim 2  wherein said pivot is of one piece construction. 
   
   
       4 . The pivot assembly of  claim 3  wherein said pivot is fabricated of plastic. 
   
   
       5 . The pivot assembly of  claim 1  wherein said attachment portion of said pivot comprises a resilient C-shaped clip. 
   
   
       6 . The pivot assembly of  claim 5  wherein a central axis of said C-shaped clip is aligned with a direction of said longer key wings. 
   
   
       7 . The pivot assembly of  claim 1  wherein said longer key wings are shorter than said longer keyway wings. 
   
   
       8 . A pivot comprising:
 an attachment portion comprising a resilient C-shaped clip;   a key projecting rearwardly from said attachment portion, said key having a rearward section with oppositely directed longer key wings and a middle section between said attachment portion and said rearward section, said middle section having oppositely directed shorter key wings having convexly radiused ends, said shorter key wings extending in a direction aligned with that of said longer key wings,   a central axis of said C-shaped clip being aligned with a direction of said longer key wings.   
   
   
       9 . A chair control, comprising:
 a slide plate having a keyway, said keyway having two oppositely directed longer keyway wings extending from a middle section, said middle section having two oppositely directed shorter keyway wings extending in a direction transverse to that of said longer keyway wings, said shorter keyway wings having convexly radiused ends; and   a pivot having an attachment portion and a key projecting rearwardly from said attachment portion, said key having a rearward section with oppositely directed longer key wings which are longer than said shorter keyway wings but sufficiently short to allow said longer key wings to pass through said keyway and a middle section between said rearward section and said attachment portion, said middle section having oppositely directed shorter key wings having convexly radiused ends, said shorter key wings extending in a direction aligned with that of said longer key wings, said shorter key wings having a length substantially matching that of a length of said shorter keyway wings and each shorter key wing radiused end having a radius substantially matching a radius of a radiused end of each of said shorter keyway wings, said shorter key wings fit between ends of said keyway shorter wings.   
   
   
       10 . The chair control of  claim 9  wherein said slide plate has a thickness substantially matching a thickness of said middle section. 
   
   
       11 . The chair control of  claim 10 , wherein said pivot is of one piece construction. 
   
   
       12 . The chair control of  claim 11  wherein said pivot is fabricated of plastic. 
   
   
       13 . The chair control of  claim 10  further comprising an arm attached to said attachment portion of said pivot, said arm terminating in a free end received in a slot of said slide plate such that rotation of said arm at said pivot is limited. 
   
   
       14 . The chair control of  claim 13  wherein said attachment portion of said pivot comprises a resilient C-shaped clip. 
   
   
       15 . The chair control of  claim 14  wherein a central axis of said C-shaped clip is aligned with a direction of said longer key wings. 
   
   
       16 . The chair control of  claim 9  wherein said longer key wings are shorter than said longer keyway wings.