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Height adjustable chair armrestHeight adjustable chair armrest description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080036265, Height adjustable chair armrest. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001]The present invention relates to a height adjustment structure for a chair armrest and more particularly a height adjustable armrest structure positioned on both sides of a chair, which is easy to be manufactured and fast to be assembled with stability and accuracy. BACKGROUND OF THE INVENTION [0002]There are many models developed and designed by industry for adjusting height of chair armrests. In general, there are provided upper and lower tubes combined together. One of the tubes has a control groove for allowing an elastic lifter assembly to move up-and-down. The other tube is provided with said elastic lifter assembly for adjusting direction and height of the chair armrest. Therefore, a user can adjust the armrest at a desired position and height in accordance with the most comfort. SUMMARY OF THE INVENTION [0003]In order to overcome the shortages of the conventional height adjustable chair armrest structure which is currently developed by the industry, the present invention is to provide another improved height adjustable armrest structure for a chair. More particularly, the chair armrest structure of the present invention can be individually manufactured and is easy to be assembled. Further, the chair armrest can keep a stable position while the height adjustment is performed. [0004]In one object of the present invention is to provide a chair armrest structure including an upper and lower tubes and a push member. The push member is mounted on one side of the upper tube. Pressing of an upper section of the push member will make a first protrusion at a lower section of the push member to depart from one of a plurality of holes of the lower tube so as to adjust the height of the armrest by simple operation, and releasing of the upper section of the push member will make the upper section of the push member to return to the original position by expansion of an elastic element and cause the first protrusion at the lower section of the push member to enter into one of the holes of the lower tube at the related position. [0005]In another object of the present invention is that each of upper and lower ends of the lower tube is formed with a circular groove having two spaced holes for allowing a circular supporting unit having an opening to be mounted thereon; and each end of the circular supporting unit defining the opening have an inward protrusion respectively for being inserted into the hole of the circular grooves of the lower tube so that the lower tube has an exact contact with the upper tube and a smooth movement of the upper tube is achieved when the height adjustment of the armrest is performed. [0006]In yet another object of the present invention is to provide a bar groove extending vertically on one side of the lower tube between upper and lower circular grooves for receiving a protrusion protruding from one inner side of the upper tube to provide a smooth guide of movement and a highest and lowest limit of height adjustment when the height adjustment of the armrest is performed. [0007]In yet another object of the present invention is to provide a convex member with a containing space formed on a middle section on one side of the upper tube for receiving a flexible gripper. The gripper is bent to form a gripping space having a narrower opening for allowing a fastener provided on one side of the push member with a wider outer section and a narrower inner section to be fitted therein so that the push member has a flexible and stable contact with the upper tube. [0008]In yet another object of the present invention is to provide a restriction part having an annular groove on one side of the upper tube corresponding to the push member for holding the elastic element by cooperating with a second protrusion on a recess of said push member so as to provide a stable and elastic operation of the push member. [0009]In yet another object of the present invention is to provide a through hole on one end of the upper tube for allowing the first protrusion of the push member to movably pass therethrough and for being coordinated with the plurality of the holes of the lower tube. [0010]In yet another object of the present invention is to provide a frame around the convex member, the restriction part and the through hole for allowing the push member to be mounted thereon and to be flexibly pushable. [0011]The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0012]FIG. 1 is a perspective exploded view showing a height adjustable chair armrest according to the present invention; [0013]FIG. 2 is a side cross-sectional view showing the assembled armrest of FIG. 1; [0014]FIG. 3 is a cross-sectional view taken along line 30-30 of FIG. 2; [0015]FIG. 4 illustrates a height adjustment of the chair armrest according to the present invention; [0016]FIG. 5 is another perspective exploded view showing the chair armrest according to the present invention; and [0017]FIG. 6 is a view of a partial assembled chair armrest according to the present invention. DETAILED DESCRIPTION OF SOME EMBODIMENTS [0018]The foregoing aspects, as well as many of the attendant advantages and features of this invention will become more apparent by reference to the following detailed description, when taken in conjunction with the accompanying drawings. [0019]The present invention relates to a height adjustable chair armrest. Referring to FIG. 1, the chair armrest structure comprises a lower tube 1, two circular supporting units 2, an upper tube 3, a flexible gripper 4, a push member 5, an elastic element 6, and a pad 7. Continue reading about Height adjustable chair armrest... Full patent description for Height adjustable chair armrest Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Height adjustable chair armrest patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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