BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to office chairs, particularly to adjustable armrests of office chairs.
2. Related Art
Ergonomic chairs have been very popular in the market. Such a kind of chairs has various adjustment functions to provide comfort support to users.
An armrest of a conventional ergonomic chair can be adjusted, but only two positions can be adjusted to because of its simple structure. Although there are some armrest structures using a rail and fixing mechanism to improve adjustment, their durability is not good enough.
In sum, simple adjustment structures do not possess good durability, but adjustment structures with good durability are too expensive. There is not a moderate product which can satisfy two requirements of durability and cost.
SUMMARY OF THE INVENTION
An object of the invention is to provide a chair armrest assembly, which is simple and durable to adjust an armrest.
To accomplish the above object, the armrest assembly of the invention includes a connecting seat, an adjusting rod, a link and an armrest seat. The connecting seat has a connecting rod and a hollow connecting tube with a fixing hole. The adjusting rod has a ring and a bar. The bar is received in the connecting tube and formed with adjusting holes in a row. A fixing block is formed under the adjusting holes and inserted into the fixing hole. The link passes through the connecting tube. Two ends of the link are separately formed with a fixing insert for being inserted into one of the adjusting holes and a pushing button. The armrest seat has a support and an armrest. The support is received in the connecting tube and receives the link. The pushing button projects from a through hole of the support.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the invention installed in a chair;
FIG. 2 is an assembled view of the invention;
FIG. 3 is an exploded view of the invention;
FIGS. 4-6 are cross-sectional views of the invention in different statuses;
FIG. 7 is an exploded view of the armrest of the invention;
FIG. 8 is an assembled view of the armrest of the invention;
FIGS. 9-10 are longitudinally sectional views of the armrest of the invention; and
FIGS. 11-13 are schematic view shows how the armrest is adjusted.
DETAILED DESCRIPTION OF THE INVENTION
Please refer to FIGS. 1-3. As shown in FIG. 1, the armrest assembly of the invention is installed to two sides of a chair 100. As shown in FIGS. 2 and 3, the armrest assembly is primarily composed of a connecting seat 1 and an armrest seat 2. The connecting seat 1 is fastened to the bottom of the cushion 101 of the chair 100. The connecting seat 1 is of an L shape and is composed of a connecting rod 11 and a connecting tube 12. In this embodiment, the connecting rod 11 and the connecting tube 12 are integratedly formed. The connecting seat 11 is formed with a connecting trough 111 for connecting the cushion 101. The connecting tube 12 has a fixing hole 121 near the bottom end thereof.
Please refer to FIG. 3. An adjusting rod 3 is received in the connecting tube 12. The adjusting rod 3 is provided with a ring 31 and a bar 32 thereunder. The bar 32 is received in the connecting tube 12 and the ring 31 abuts against an opening of the connecting tube 32. The bar 32 is formed with adjusting holes 33 in a row and a fixing block 34 near the bottom end of the bar 32. The adjusting block 34 is received in the fixing hole 121 for securing the adjusting rod 3 and the connecting tube 12. A link 4 is further received in the connecting tube 12 and parallel to the adjusting rod 3. A middle portion of the link 4 is formed with a protrusion 41. A bottom end of the link 4 is formed with a fixing insert 42 toward the adjusting rod 3. The fixing insert 42 is embedded into one of the adjusting holes 33. A flexible arm 43 is arranged near the fixing insert 42 and is opposite to the fixing insert 42. A top end of the link 4 is provided with a pushing button 44 toward an opposite direction of the fixing insert 42.
The armrest seat 2 has a support 21 and an armrest 22 atop the support 21. The armrest seat 2 is of a T shape. The support 21 is hollow and partially received in the connecting tube 12 with engaging the support 21 with the ring 31 so that the armrest seat 2 and the connecting seat 1 can be secured. The link 4 is also received in the connecting tube 12 and the support 21. The protrusion 41 presses against the support 21. The pushing button 44 projects from a through hole 211 of the support 21. The support 21 is formed with a receiving hole 212 for receiving the fixing insert 42. The connecting tube 12 is further provided with a sheath 5 for securing the connecting seat 1 and the armrest seat 2.
Please refer to FIGS. 4-6. As shown in FIG. 4, in an initial status, the fixing insert 42 is embedded into the receiving hole 212 and the bottom one of the adjusting holes 33. To adjust height of the armrest 22, as shown by the arrow in FIG. 5, the link 4 likes a seesaw with a fulcrum formed by the protrusion 41, pressing the pushing button 44 will make the fixing insert 42 escape the receiving hole 212 and the adjusting hole 33 so that the support 21 can be moved in the connecting tube 12. As shown in FIG. 6, when the support 21 is pulled up to a desired position, the receiving hole 212 just corresponds to another adjusting hole 33, the link 4 is pushed by the flexible arm 43 to embed the fixing insert 42 into the receiving hole 212 and adjusting hole 33 and the pushing button 44 returns.
Please refer to FIG. 7. The armrest 22 is composed of a base 221 and a cover 222. The base 221 is formed with a connecting cavity 2211 and a connecting member 223 therein. The connecting member 223 has a column 2231 with threaded holes 2232. Additionally, the base 221 has a fixing plate 224 over the connecting member 223. The fixing plate 224 has a sliding trough 2241 around the column 2231. A side of the fixing plate 224 is provided with round holes 2242 and flexible washers 225 separately received in the round holes 2242. A fixing member 226 is placed in the fixing plate 224. The fixing member 226 corresponds to the column 2231. The fixing member 226 has screw holes 2261 corresponding to the threaded holes 2232 for being passed by bolts 227. One of the bolts 227a is screwed into the screw hole 2261 and the threaded hole 2232 to secure the connecting member 223 and the fixing member 226. Another bolt 227b is screwed into the screw hole 2261 only. As shown in FIG. 8, the fixing member 226 is provided with a flexible washer 225 corresponding to a waved surface 2243 of the fixing plate 224.
Please refer to FIGS. 9 and 10. The armrest 22 is connected to the support 21 through the connecting member 223. When the connecting member 223 is located in connecting cavity 2211, a gap 2212 is formed between the connecting cavity 2211 and the connecting member 223 so that the bottom of the base 221 can be embedded into the gap 2212. As a result, the base 221 may be longitudinally adjusted as shown in FIG. 10.
Please refer to FIGS. 11 and 12. The base 221 may be horizontally adjusted by attaching the flexible washer 225 in the fixing member 226 onto the waved surface 2243.
Please refer to FIG. 13. The fixing member 226 may rotate about the bolt 227a screwed in the screw hole 2261 and the threaded hole 2232 within a range of 30 degrees. As a result, the armrest 22 is rotatable.
Patent Grant
9084487
