US 20050146190 A1
A chair back supports a positionable headrest assembly including a post and headrest with the post manually positionable in a channel on the chair back. A retainer arm bears against the post to inhibit post travel against all but deliberately applied force, as for example, by a dental assistant when adjusting a dental chair to accommodate the next patient. A threaded member in the chair back is settable to apply the desired resistance to post travel during headrest adjustment. Access to the threaded member for adjustment purposes may be by an opening in the chair back normally receiving a fastener securing a chair component.
1. In a chair having back and a headrest assembly including a headrest and post, the improvement comprising,
a guideway on the chair back in which the post is carried,
a retainer assembly on the chair back including an arm having a distal end, adjustable means for biasing said distal end toward the post to inhibit post movement along the guideway to enable headrest positioning relative the chair back by selected degrees of manual force.
2. The improvement claimed in
3. The improvement claimed in
4. The improvement claimed in
5. The improvement claimed in
6. In a chair having a back and a headrest assembly including a headrest and a post, the improvement comprising,
a guideway on the chair back receiving the post,
a retainer assembly including a retainer acting on the post, adjustable means for biasing the retainer towards the post to inhibit movement of the post along the guideway, and
a removable fastener normally seated in the chair back and upon fastener removal providing an opening permitting access of a tool to said adjustable means for altering the biasing force of said retainer applied to the post.
7. The improvement claimed in
8. The improvement claimed in
9. The improvement claimed in
10. The improvement claimed in claimed 6 wherein said adjustable means includes an adjustment screw.
11. The improvement claimed in
12. An adjustable retainer for a headrest assembly supported by the back of a chair or vehicle seat and including,
a guideway carried by the chair back,
a post positionable along the guideway to determine the elevation of a headrest carried by the post,
a retainer arm on the guideway proximate the post for applying a force transversely of the post to inhibit post travel along the guideway and
a threaded member in abutment with the retainer arm and axially positionable to vary the force applied to the post and hence the degree to which post travel is inhibited
13. The adjustable retainer for the headrest claimed in
The present invention concerns adjustable headrests as found on dental chairs, vehicle seats, etc.
Typically a headrest is supported by a rib or post extending downwardly into a seat or chair back in a positionable manner. Some headrests are positionable, in an incremental fashion, to best support a user's head, the height of which will of course vary with different occupants. In a chair used by several persons during a day, as for example a dental chair, the headrest must be manually adjusted several times a day. Hence a headrest should be readily adjustable without substantial physical force being required For example, in a dental office the force required for repeated adjustment during a working should not be excessive or excessive to a dental assistant or the dentist. Further, a headrest should not be susceptible to accidental displacement and yet infinitely adjustable to support the user's head in an optimum manner.
The present invention is directed toward the provision of a headrest assembly for use in place on chairs or vehicle seats and readily positionable to accommodate a wide range of user sizes.
A guideway on the seat or chair houses a post for rectilinear positioning. Infinite movement of the post is against the resistance of a retainer assembly to the extent the headrest is not subject to unintentional displacement but yet readily positionable when desired. A retainer member is biased into post engagement in a precise manner to permit such positioning with light or heavy forces as desired.
The retainer assembly is concealed within the chair back but yet readily accessible for retainer adjustment. Access to the retainer assembly is via an opening in the chair back normally occupied by a removable fastener serving to secure a chair fitting. Added structure to a chair to provide such access to the interior of a chair back is thereby avoided as well as detracting from chair appearance. A retainer is biased into contact with a post mounted sleeve of synthetic material to provide post adjustment in a controlled manner.
In the accompanying drawings:
In the accompanying drawings wherein applied reference numerals indicate parts hereinafter identified, the reference numeral 1 indicates generally a fragment of a chair back which may be the back of a dental chair or that of another type of chair for example a vehicle seat.
A channel 4 extends upwardly along the length of seat back 3 with channel flanges 4A-4B secured to back 3 as by welds. Channel 4 and seat back 3 define an elongate open area or guideway 9 for the reception of a post 5 of a headrest assembly which includes a headrest proper at 6. Post 5 corresponds generally in section to the space defined by channel 4 and the seat back to enable rectilinear positioning of post 5 to locate headrest 6 a specific distance from the chair or seat bottom (not shown) to accommodate successive dental patients during a work day. At the upper terminus of channel 4 are tabs 7 each with a nut 8 secured thereto.
A retainer assembly located generally at 12 has a screw 16 with a head for the reception of a tool for adjustment purposes as later described. A channel flange 20 carries a threaded element 21 for reception of screw 16 the lower end of which bears upon an arm 22. An arm end 22A is displaceable relative a side 5A of post 5. A proximal end segment 23 of arm 22 is moveably mounted on a flange 25 with a stud 24 on the arm projecting through an oversized opening 25A in flange 25. The somewhat elongate, oversized opening 25A permits limited arcuate movement of retainer arm 22 in a plane containing post 5. Flange 4B defines an opening 19 to receive distal end 22A of arm 22.
A bearing sleeve at 26 is shown partially formed in
In some applications of the present headrest retainer, the headrest post 5 may be virtually locked against any displacement.
While I have shown but one embodiment of the invention, it will be apparent to those skilled in the art that the invention may be embodied still otherwise without departing from the spirit and scope of the claimed invention.
Having thus described the invention, what is desired to be secured by a Letters Patent is: