초록 ▼

A quickly released and fastened adjustment mechanism including a gasket, a first ratchet, a second ratchet, a T-shaped sleeve and a fastener is installed between a sliding member and a fixing member. The first and second ratchets are arranged with annular teeth respectively while the two annular tee

A quickly released and fastened adjustment mechanism including a gasket, a first ratchet, a second ratchet, a T-shaped sleeve and a fastener is installed between a sliding member and a fixing member. The first and second ratchets are arranged with annular teeth respectively while the two annular teeth are engaged. The T-shaped sleeve is mounted in the first and second ratchets and against the gasket. The fastener is passed through the T-shaped sleeve, the gasket and the sliding member to be secured on the fixing member. Thus the two corresponding annular teeth are engaged firmly. The height difference between low-level and high-level engagement of the two annular teeth is Hf. The sleeved height of the T-shaped sleeve is D1. The total height of the first and second ratchets in the low-level engagement is D2. D1D2. D1−D2=G0 and HfG0.

대표청구항 ▼

1. A quickly released and fastened adjustment mechanism installed between a sliding member and a fixing member for adjustment of the released sliding member with respect to the fixing member and fastening of the sliding member after adjustment comprising: a gasket having a central hole, a first surf

1. A quickly released and fastened adjustment mechanism installed between a sliding member and a fixing member for adjustment of the released sliding member with respect to the fixing member and fastening of the sliding member after adjustment comprising: a gasket having a central hole, a first surface in contact with a bottom surface of a long stepped hole of the sliding member, and a second surface opposite to the first surface;a first ratchet that includes a central hole, a first surface attached to the second surface of the gasket, a second surface opposite to the first surface and disposed with annular teeth; the annular teeth having at least one ratchet surface that is arranged annularly and including a low surface, a high surface, and a slope extended from the low surface to the high surface;a second ratchet including a central hole, a first surface disposed with annular teeth corresponding to and engaged with the annular teeth on the second surface of the first ratchet, and a second surface opposite to the first surface; the annular teeth having at least one ratchet surface that is arranged annularly and including a low surface, a high surface, and a slope extended from the low surface; the ratchet surface of the second ratchet is engaged with the ratchet surface of the first ratchet in a one-on-one manner; the low surface of the ratchet surface of the second ratchet being engaged with the high surface of the ratchet surface of the first ratchet to form a low-level engagement; the high surface of the ratchet surface of the second ratchet being rotated and engaged with the high surface of the ratchet surface of the first ratchet to form a high-level engagement;a T-shaped sleeve that includes a central hole, a first end against the second surface of the gasket, a T-shaped flange, and a second end opposite to the second end, located on an inner surface of the T-shaped flange and against the second surface of the second ratchet; anda fastener that is passed through the central hole of the T-shaped sleeve, the central hole of the gasket and a long slot on the bottom surface of the long stepped hole of the sliding member in turn to be secured on the fixing member; thus the fastener is fixed relative to the fixing member while the T-shaped sleeve, the first ratchet, the first ratchet and the gasket are integrated; wherein the second ratchet and the first ratchet are clipped between the second end of the T-shaped sleeve and the second surface of the gasket, and the annular teeth of the first ratchet and the annular teeth of the second ratchet are engaged firmly; wherein the second ratchet is operated to rotate an angle relative to the first ratchet in a clockwise or counterclockwise direction so that the annular teeth of the first ratchet and the annular teeth of the second ratchet engaged correspondingly are changed from the low-level engagement to the high-level engagement or from the high-level engagement to the low-level engagement; wherein a distance between the second surface of the second ratchet and the first surface of the first ratchet is increased when the annular teeth of the first ratchet and the annular teeth of the second ratchet engaged correspondingly are changed from the low-level engagement to the high-level engagement; the maximum distance increased therebetween is height difference between the low-level engagement and the high-level engagement of the annular teeth of the first ratchet and the annular teeth of the second ratchet, and is represented by Hf; wherein a height difference between the first end and the second end of the T-shaped sleeve, a sleeved height of the T-shaped sleeve, is represented by D1 when the annular teeth of the first ratchet and the annular teeth of the second ratchet are in the low-level engagement while a distance between the second surface of the second ratchet and the first surface of the first ratchet is represented by D2; wherein D1>D2, D1−D2=G>0; Hf and G satisfies the following condition: Hf>G>0; wherein the first surface of the gasket is not tightly pressed against the bottom surface of the long stepped hole of the sliding member when the second ratchet is rotated relative to first ratchet and changed from the high-level engagement to the low-level engagement; thus the sliding member and the gasket are released state and able to slide relative to each other; therefore the sliding member is moved and adjusted relative to the fixing member; wherein the first surface of the gasket is tightly pressed against the bottom surface of the long stepped hole of the sliding member when the second ratchet is rotated relative to first ratchet and changed from the low-level engagement to the high-level engagement; thus the sliding member and the gasket are fastened and positioned; therefore the sliding member is unable to be moved and adjusted relative to the fixing member, wherein a stop mechanism is set between the first ratchet and the second ratchet; the stop mechanism is used for limiting two stop points and movement therebetween of clockwise or counterclockwise rotation of the second ratchet relative to the first ratchet, andwherein the stop mechanism includes at least one stop pin disposed on the second surface of the first ratchet and at least one stop groove arranged at the first surface of the second ratchet; wherein the stop groove is extended to have an angle of rotation and two opposite stop ends; the stop pin is mounted into the stop groove correspondingly and moveable between the two stop ends. 2. The device as claimed in claim 1, wherein a handle is set on and extended from the second ratchet for being operated to rotate the second ratchet relative to the first ratchet. 3. The device as claimed in claim 1, wherein the sliding member is a horizontal support on a bottom of an armrest of a chair while the fixing member is a seat of the chair; the horizontal support on the bottom of the armrest is set on a bottom surface of the seat of the chair so that the armrest is able to be moved and adjusted horizontally relative to the seat after the adjustment mechanism being released and then the adjustment mechanism is fastened for positioning the armrest. 4. The device as claimed in claim 3, wherein Hf is about 1.3 mm and G is about 0.5 mm. 5. The device as claimed in claim 1, wherein a shape of the gasket is matched to a shape of the long stepped hole of the sliding member so that the gasket is only moved in the long stepped hole, not rotated in long stepped hole while the second ratchet is operated to rotate.