Chair back adjuster

The ornamental design for a chair back adjuster, as shown and described.

FIG. 1 is a perspective view of a chair back adjuster showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Features shown in broken lines depict portions of the chair back adjuster that form no part of the claimed design.

Patent	Priority	Assignee	Title
D904099,	Jun 22 2018	P.S. Pibbs, Inc.; P S PIBBS, INC	Reclining mechanism for a threading chair

Patent	Priority	Assignee	Title
5791734,	Jul 11 1996	Malenotti S.r.l.	Chair with a backrest which is continuously adjustable height
5882078,	Jan 08 1996	Sifa Sitzfabrik GmbH	Clamp adjustable-height seat-backs
6276757,	Nov 23 1998	Klasse Pty Ltd.	Back support improvement
6631953,	Sep 25 2001		Backrest elevator device
7275790,	Apr 18 2005		Backrest elevation adjustment assembly
7341233,	Sep 19 2003	L & P Property Management Company	Horizontal adjustment mechanism for use on a chair seat
7360837,	May 29 2007		Backrest adjusting device for chair
9113716,	Dec 24 2013		Height-adjustable backrest assembly
20100090512,
20110085851,
D736551,	Sep 23 2013		Elevating part of a chair back

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