Height adjusting mechanism and stool for dental practitioner

A height adjusting mechanism for a dentistry stool, comprising:

• a support member coupleable to the stool adjacent an aft side of a seat of the stool, the support member having at least one pair of guide features that are parallel and laterally spaced from each other, wherein at least one of the pair of guide features comprises a series of longitudinally spaced height positions corresponding to different heights;
• a movable height adjusting assembly that is selectively movable longitudinally relative to the support member, the height adjusting mechanism having an inner surface with guide members configured to engage the pair of guide features, respectively, in the support member from a first side;
• an engagement member having a fixed end attached to one of the guide features and a distal end engageable with a selected one of the height positions from an aft side of the support member;
• a pushbutton actuator positionable on a front side of the movable height adjusting assembly adjacent a seated user, the pushbutton actuator being manually depressible past a forward side of the support member to contact the distal end of the engagement member and urge the engagement member out of engagement with the selected one of the height positions, the movable height adjusting assembly thereby being released to be movable longitudinally with the guide members sliding relative to the guide features from the selected height position to a new height position.