A height-adjustable mechanism for a seat armrest

Abstract

This invention relates to a device comprising a connecting rod, a positioning plate, a sleeve, a positioning rod, a connecting seat, a button, an elastic element, and a pad. The connecting rod has an upright portion. The positioning plate is located on the top surface of the upright portion and has a positioning hole. The positioning rod has a positioning section at its center, with an actuating end connected to its top end. The positioning section has a plurality of positioning bodies at different heights, with annular grooves between adjacent positioning bodies. A shaft is located above the center of the actuating end, and an actuating post is located on one side of the shaft. The connecting seat is located on the sleeve, with a central shaft hole for inserting the shaft and an arc-shaped actuating groove for inserting the actuating post. The button is located at the joint seat and has a pressing part. One side of the pressing part has an actuating part with an elongated through hole. The actuating part is engaged with the actuating column. The elastic element provides elasticity for the button's operation. The pad is located above the sleeve. Thus, the handrail lifting and positioning action of the present invention can have better support and operational stability.

Claims

1. A seat armrest lifting structure, comprising: A connecting rod with an upright section; a positioning plate located at the top of the upright section, having a positioning hole, which is elongated and has a support portion on each of its two long sides; a sleeve fitted onto the upright section and capable of raising and lowering it accordingly; a positioning rod, a straight rod with a positioning section in the center, the top of which is connected to an actuating end, and multiple positioning bodies at different heights on the positioning section, with annular grooves slightly larger than the thickness of the positioning plate between adjacent positioning bodies, the positioning bodies passing through the positioning hole, their length being less than the length of the positioning hole but greater than the distance between the two long sides of the positioning hole, and their two long sides having abutment portions that can abut against the support portions; the actuating end having a diameter larger than the positioning section, with a shaft column located at the top center, and an actuating column eccentrically located on one side of the shaft column that can drive the positioning rod to rotate; A coupling seat is provided on the sleeve, with a central hole for inserting the shaft post, and an arc-shaped actuating groove for inserting the actuating post corresponding to the position of the actuating post. The actuating groove has a locking abutment end and a non-locking abutment end on each side. A button is provided at the coupling seat position and can move relative to the coupling seat. It has a pressing part, with an actuating part on one side. The actuating part has an elongated through hole for inserting the shaft post corresponding to the position of the shaft post, and the actuating part engages with the actuating post. An elastic element provides elasticity for button operation. A pad is provided above the sleeve. When the button is not pressed, the actuating post can abut against the locking abutment end and the abutment part abuts against the support part; when the button is pressed, the actuating post abuts against the non-locking abutment end, and the positioning body is aligned with the positioning hole.

2. The seat armrest lifting structure as described in claim 1, wherein the bottom end of the positioning section of the positioning rod is connected to a stop body, the stop body can pass through the positioning hole, its length is less than the length of the positioning hole and greater than the distance between the two long sides of the positioning hole, and the stop body and the positioning body are arranged in a perpendicular direction.

3. The seat armrest lifting structure as described in claim 1, wherein the connecting seat has an upper seat and a lower seat docking assembly, the upper seat and the lower seat each have an upper plate and a lower plate, the lower plate has flanges on both sides facing upwards, and after the upper seat and the lower seat docking assembly, the upper plate and the lower plate have a slot between them that can accommodate the linear displacement of the actuating part of the button.

4. The seat armrest lifting structure as described in claim 3, wherein an accommodating groove is provided on the inner side of the upper plate and the lower plate, and the actuating part of the button is provided with a protrusion on the side opposite to the pressing part; and the elastic element is a telescopic spring, which is provided in the accommodating groove, with one end engaging with the protrusion of the button and the other end abutting against the sleeve.

5. The seat armrest lifting structure as described in claim 1, wherein the connecting rod has a connecting section below it, the connecting section is connected upward to the upright part, and the upright part has a slot above it corresponding to the positioning hole position, through which the positioning rod can be inserted in the up and down direction.

6. The seat armrest lifting structure as described in claim 5, wherein the slot is circular.

7. The seat armrest lifting structure as described in claim 1, wherein the sleeve has an outer ring portion, the outer ring portion has an inner ring portion at its center, and the inner ring portion has a sleeve hole at its center that can fit the upright portion in the up and down directions.

8. The seat armrest lifting structure as described in claim 7, wherein the outer ring portion is provided with a through hole through which the pressing portion of the button can be inserted.

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