A chair includes a positioning unit that is provided in a receiving portion of an armrest and that includes shorter and taller stop portions. A positioning member is retained movably on a rear side of a backrest, and has one end extending into the receiving portion to abut against a selected one of
A chair includes a positioning unit that is provided in a receiving portion of an armrest and that includes shorter and taller stop portions. A positioning member is retained movably on a rear side of a backrest, and has one end extending into the receiving portion to abut against a selected one of the stop portions. An operating unit is connected to and is operable to move the positioning member for selectively disengaging and engaging the stop portions. A safety mechanism is provided on the backrest and the operating unit, and is operable in either a limiting state, where the positioning member is unable to move past the taller stop portion, or a non-limiting state, where the positioning member is able to move past the taller stop portion.
대표청구항▼
What is claimed is: 1. A chair comprising: a seat; a backrest connected pivotally to said seat; an armrest disposed at a lateral side of said seat, and having a receiving portion; a positioning unit provided in said receiving portion of said armrest, and including a first positioning block formed w
What is claimed is: 1. A chair comprising: a seat; a backrest connected pivotally to said seat; an armrest disposed at a lateral side of said seat, and having a receiving portion; a positioning unit provided in said receiving portion of said armrest, and including a first positioning block formed with a first stop portion, and a second positioning block formed with a second stop portion and spaced apart from said first positioning block in a first direction, each of said first and second stop portions having a height in a second direction substantially transverse to the first direction, the height of said second stop portion being greater than that of said first stop portion; a positioning member retained movably on a rear side of said backrest, and having one end that is extended into said receiving portion of said armrest and that is disposed to abut against a selected one of said first and second stop portions; an operating unit connected to said positioning member and operable to drive movement of said positioning member relative to said backrest and said positioning unit in said receiving portion of said armrest for disengaging said one end of said positioning member from said first and second stop portions and for subsequently engaging said one end of said positioning member with the selected one of said first and second stop portions; and a safety mechanism including a first limit component provided on said backrest, and a second limit component provided on said operating unit, said safety mechanism being operable in one of a limiting state, where said first limit component cooperates with said second limit component so that said one end of said positioning member is displaceable in the second direction in response to operation of said operating unit by a shorter distance sufficient to move past the height of said first stop portion but insufficient to move past the height of said second stop portion, and a non-limiting state, where said first and second limit components permit displacement of said one end of said positioning member in the second direction in response to operation of said operating unit by a longer distance that is longer than the shorter distance and that is sufficient for said one end of said positioning member to move past the height of said second stop portion. 2. The chair as claimed in claim 1, further comprising a spring for biasing said operating unit toward said armrest, said spring having a first end acting on said backrest and a second end acting on said operating unit. 3. The chair as claimed in claim 2, wherein said operating unit is formed with a chamber for accommodating said spring, and said backrest is formed with a tab that extends into said chamber to abut against said first end of said spring. 4. The chair as claimed in claim 1, wherein said second limit component is an elongate slot, and said first limit component is a resilient finger that extends into said slot when said safety mechanism is in the limiting state, said resilient finger being depressible to extend out of said slot to switch said safety mechanism from the limiting state to the non-limiting state. 5. The chair as claimed in claim 1, wherein said first positioning block further has a curved portion opposite to said first stop portion and facing toward said second positioning block. 6. The chair as claimed in claim 1, wherein said positioning member includes an extending segment formed with said one end, and a connecting segment connected to said extending segment and further connected to said operating unit. 7. The chair as claimed in claim 6, wherein said operating unit is formed with an aligned pair of retaining grooves for retaining said connecting segment of said positioning member. 8. The chair as claimed in claim 7, wherein said operating unit includes: a cap body having a peripheral edge formed with said retaining grooves; and a tongue that extends downwardly and outwardly from said cap body. 9. The chair as claimed in claim 8, wherein said second limit component is an elongate slot formed in said tongue, and said first limit component is a resilient finger that extends into said slot when said safety mechanism is in the limiting state, and that extends out of said slot when said safety mechanism is operated in the non-limiting state. 10. The chair as claimed in claim 8, wherein said backrest is formed with an elongate guide slot, said cap body of said operating unit being provided with a guide pin that is slidably retained at said guide slot to guide movement of said operating unit relative to said backrest. 11. A chair comprising: a seat; a backrest connected pivotally to said seat; a receiving portion disposed at a lateral side of said seat; a positioning unit provided in said receiving portion, and having shorter and taller stop portions respectively defining vertical and horizontal backrest positions; a positioning member retained movably on a rear side of said backrest, and having one end that is extended into said receiving portion to engage a selected one of said shorter and taller stop portions; an operating unit connected to said positioning member and operable to drive movement of said positioning member relative to said backrest and said positioning unit in said receiving portion; and a safety mechanism including a first limit component provided on said backrest, and a second limit component provided on said operating unit, said safety mechanism being operable in one of a limiting state, where said first limit component cooperates with said second limit component to limit extent of displacement of said one end of said positioning member such that said one end of said positioning member is unable to move past said taller stop portion, and a non-limiting state, where said first and second limit components permit displacement of said one end of said positioning member in response to operation of said operating unit by a distance that is sufficient for said one end of said positioning member to move past said taller stop portion. 12. The chair as claimed in claim 11, wherein said second limit component is an elongate slot, and said first limit component is a resilient finger that extends into said slot when said safety mechanism is in the limiting state, said resilient finger being depressible to extend out of said slot to switch said safety mechanism from the limiting state to the non-limiting state. 13. The chair as claimed in claim 11, wherein said operating unit includes a cap body that has a peripheral edge formed with an aligned pair of retaining grooves, and a tongue that extends downwardly and outwardly from said cap body, said positioning member being retained by said retaining grooves of said cap body such that said operating unit is able to drive movement of said positioning member. 14. The chair as claimed in claim 13, wherein said backrest is formed with an elongate guide slot, said cap body of said operating unit being provided with a guide pin that is slidably retained at said guide slot to guide movement of said operating unit relative to said backrest.
Sclare, Jacob; Thomson, John M.; Costello, Cary; Nolan, Patrick B.; Dotsey, Michael A.; Dingler, Noah E., Booster seat with stowable tray and/or stowable securing strap.
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