Chairs and seats – Armrest – Adjustable to multiple use positions relative to bottom or back
Patent
1999-04-12
2000-06-27
Nelson, Jr., Milton
Chairs and seats
Armrest
Adjustable to multiple use positions relative to bottom or back
29741135, A47C 754
Patent
active
060797878
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to armrest mechanism for dental chairs of the type which causes the armrests to track the movement of the chair back.
2. Description of the Prior Art
On most dental chairs, the armrests do not move with the chair back, with the result that the armrests are not in the most ergonomic position for various inclined positions of the chair back.
Some chairs have been manufactured with sliding armrests, but many chairs with sliding armrests incorporated slings for arm support, which may not provide the support and comfort required by patients.
It is preferable to be able to lower the chair back for shipping, however, it is necessary to do so in a manner that does not complicate shipping, or subsequent installation of the chair in the field.
The armrest mechanism of the invention causes allow the back to be lowered for shipping, but permits easy installation in the field.
SUMMARY OF THE INVENTION
This invention relates to armrest mechanism for dental chairs, which causes the armrests to track the movement of the chair back, to maintain the same relative inclination, which armrests can be slid back for patient entry or exit, and which allows the back to be lowered for shipping, but provides for easy installation in the field.
The principal object of the invention is to provide an armrest mechanism for dental chairs wherein the armrests track the movement of the chair back.
A further object of the invention is to provide armrest mechanism for dental chairs wherein the mechanism includes a quick release trigger to permit the armrests to be slid back for patient entry to and exit from the dental chair.
A further object of the invention is to provide armrest mechanism wherein the armrests work with the chair back cushion to provide upper arm support.
A further object of the invention is to provide armrest mechanism which can be disconnected for lowering the back for shipping, and easily reconnected for chair installation.
A further object of the invention is to provide armrest mechanism which is simple to operate but sturdy and reliable in use.
A further object of the invention is to provide easy entry and exit, by providing arms that slide back to a position that provide a "grab point" that facilitates entry and exit, which is especially helpful to geriatic patients.
Other objects and advantageous features of the invention will be apparent from the description and claims.
DESCRIPTION OF THE DRAWINGS
The nature and characteristic features of the invention will be more readily apparent from the attached description taken in connection with the accompanying drawings in which:
FIG. 1 is a left side elevation view of a dental chair incorporating the armrest mechanism of the invention;
FIG. 2 is a right side elevational view of the chair of FIG. 1 with the chair back fully down for shipping;
FIG. 3 is a left side elevational view, enlarged, of a portion of the chair of FIG. 1 with the cover out of position to illustrate the armrest mechanism in condition for shipping;
FIG. 4 is a top perspective view of the armrest mechanism of the invention with the cover out of position, illustrating its condition when the back is in an upright position;
FIG. 5 is a view similar to FIG. 4, with the cover removed to show the link portion of the mechanism of the invention;
FIG. 6 is a view similar to FIG. 4, illustrating the mechanism in shipping position;
FIG. 7 is a view similar to FIG. 4, illustrating the mechanism in assembled condition;
FIG. 8 is a view in perspective of a trigger add spring which are part of the armrest mechanism;
FIG. 9 is a bottom perspective view of the mechanism of FIG. 4;
FIG. 10 is a perspective view, in phantom, illustrating a portion of a dental chair, and the release feature of the armrest mechanism;
FIG. 11 is a perspective view, in phantom, illustrating the tracking portion of the armrest mechanism; and
FIG. 12 is a vertical sectional view taken approximately on the line 12--12 of FIG. 11.
It should, of course, be understood
REFERENCES:
patent: 3661421 (1972-05-01), Johnson
patent: 3767260 (1973-10-01), Limpach
patent: 4887866 (1989-12-01), Rusin
patent: 5364166 (1994-11-01), Zegeer
Nichols Kurt O.
Pate Edwin L.
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