Patent Application
20240074585
The present invention relates to an adjusting mechanism and, more particularly, to a headrest adjusting structure for an office chair.
A conventional office chair comprises a seat, a stand, multiple castors, a back, and two armrests. However, the conventional office chair does not have a headrest so that the user's head is not supported. Thus, the user easily has a sore neck during a long-term utilization. The conventional office chair may be provided with a neck cushion or a backrest. However, the neck cushion or backrest does not have an adjusting function so that the user easily feels uncomfortable. Alternatively, the conventional office chair may be provided with a head cushion. However, it costs much to mount the head cushion on the conventional office chair without a headrest.
The primary objective of the present invention is to provide a headrest adjusting structure for an office chair which does not have a headrest or a head cushion.
In accordance with the present invention, there is provided a headrest adjusting structure for an office chair, comprising a headrest member, a first adjusting lever, a holding unit, a second adjusting lever, a first locking member, a second locking member, and a third locking member. The headrest member is provided with a first pivot portion. The first adjusting lever has a first end provided with a second pivot portion and a second end provided with a third pivot portion. The holding unit includes an upper jaw, a lower jaw, and an adjusting bolt. The upper jaw is provided with a slideway and a passage. The lower jaw is provided with a slide. The slide is inserted into and slidably mounted in the slideway so that the upper jaw and the lower jaw are moved relative to each other. The adjusting bolt extends through the upper jaw and the lower jaw to lock the upper jaw and the lower jaw. The second adjusting lever has a first end provided with a fourth pivot portion and a second end passing through the passage of the upper jaw. The first locking member extends through the first pivot portion and the second pivot portion, so that the headrest member and the first adjusting lever are connected pivotally and are pivoted about the first locking member. The first locking member positions the headrest member in place. The second locking member extends through the third pivot portion and the fourth pivot portion, so that the first adjusting lever and the second adjusting lever are connected pivotally and are pivoted about the second locking member. The second locking member positions the first adjusting lever in place. The third locking member extends through the passage of the upper jaw and rests on the second adjusting lever, so that the second adjusting lever is positioned by the third locking member.
According to the primary advantage of the present invention, the headrest adjusting structure is mounted on the office chair without providing a headrest so that the user's head is supported exactly.
According to another advantage of the present invention, the user can adjust the height, the forward or backward position, and the inclined angle of the headrest member according to the practical requirement, thereby providing a comfortable sensation to the user.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Referring to the drawings and initially to
The headrest member 10 is provided with a first pivot portion 11.
The first adjusting lever 20 has a first end (the upper end) provided with a second pivot portion 21 and a second end (the lower end) provided with a third pivot portion 22.
The holding unit 30 includes an upper jaw (or holder) 31, a lower jaw (or holder) 32, and an adjusting bolt 33.
The upper jaw 31 is provided with a slideway 311 and a passage 312.
The lower jaw 32 is provided with a slide 321. The slide 321 is inserted into and slidably mounted in the slideway 311 so that the upper jaw 31 and the lower jaw 32 are moved relative to each other.
The adjusting bolt 33 extends through the upper jaw 31 and the lower jaw 32 to lock the upper jaw 31 and the lower jaw 32.
The second adjusting lever 40 has a first end (the upper end) provided with a fourth pivot portion 41 and a second end (the lower end) passing through the passage 312 of the upper jaw 31.
The first locking member 50 extends through the first pivot portion 11 and the second pivot portion 21, so that the headrest member 10 and the first adjusting lever 20 are connected pivotally and are pivoted about the first locking member 50. The first locking member 50 positions the headrest member 10 in place.
The second locking member 60 extends through the third pivot portion 22 and the fourth pivot portion 41, so that the first adjusting lever 20 and the second adjusting lever 40 are connected pivotally and are pivoted about the second locking member 60. The second locking member 60 positions the first adjusting lever 20 in place.
The third locking member 70 extends through the passage 312 of the upper jaw 31 and rests on (or pressing) the second adjusting lever 40, so that the second adjusting lever 40 is positioned by the third locking member 70.
In the preferred embodiment of the present invention, the upper jaw 31 and the lower jaw 32 are moved relative to each other in parallel with a first direction F1 (such as a vertical direction). The adjusting bolt 33 extends through the upper jaw 31 and the lower jaw 32 in parallel with the first direction F1.
In the preferred embodiment of the present invention, the second adjusting lever 40 has a lengthwise direction in parallel with the first direction F1.
In the preferred embodiment of the present invention, the first locking member 50 extends through the first pivot portion 11 and the second pivot portion 21 in a direction perpendicular to the first direction F1.
In the preferred embodiment of the present invention, the second locking member 60 extends through the third pivot portion 22 and the fourth pivot portion 41 in a direction perpendicular to the first direction F1. The direction of the second locking member 60 is in parallel with that of the first locking member 50.
In the preferred embodiment of the present invention, the third locking member 70 extends through the passage 312 of the upper jaw 31 in a direction perpendicular to the first direction F1. The direction of the third locking member 70 is perpendicular to that of the second locking member 60.
In the preferred embodiment of the present invention, the upper jaw 31 and the lower jaw 32 are made of plastic material with a hardness.
In the preferred embodiment of the present invention, the first pivot portion 11 is located at a back of the headrest member 10.
In the preferred embodiment of the present invention, the first end of the second adjusting lever 40 is in parallel with the first direction F1, and the second end of the second adjusting lever 40 is in parallel with the first direction F1.
In operation, referring to
Accordingly, the headrest adjusting structure 100 is mounted on the office chair 90 without providing a headrest so that the user's head is supported exactly. In addition, the user can adjust the height, the forward or backward position, and the inclined angle of the headrest member 10 according to the practical requirement, thereby providing a comfortable sensation to the user.
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the scope of the invention.
