| 主权项 |
1. A desk structure with adjustable angles, wherein an angle-adjustment unit coupled to a bottom of a desk comprises a desk board, left and right holding frames, two restricting rods, a grip rod, an inverted y-shaped desk legs, two auxiliary connecting elements, and a front guarding panel, wherein the left and right holding frames are disposed on two sides at a bottom of the desk board, respectively, and the restricting rods can be movably inserted into the left and right holding frames, respectively, wherein the left and right holding frames each comprise a carrying unit below and a topping unit above, wherein frame edges are formed on two sides of predetermined segments of the carrying unit, respectively, and a post extending upward is formed between the segments, to allow the restricting rods to be steadily inserted, wherein left and right stopping sidewalls are formed on the two sides of the carrying unit, respectively, and a restrictive protruding portion extending forward is protrudingly disposed at the middle segments of the left and right stopping sidewalls, such that a buffer frame for holding the front end of each of the restricting rods is mounted on the carrying unit, wherein frame edges extend downward from the two sides of the topping unit, respectively, and holes are formed at predetermined positions on the frame edges, such that pins can be passed through the holes of the frame edges when the inverted y-shaped desk legs are inserted and disposed between the frame edges of the topping unit, wherein a slot of a predetermined length is formed at the middle segment of the restricting rods and adapted to admit the post of the carrying unit, wherein a screwing element enclosed by a washer is rotatably screwed to the post, such that the two restricting rods can perform forward and backward displacement between the left and right holding frames and within a predetermined range, wherein an anterior end of each of the restricting rods extends to form an abutting portion, and the abutting portion is appropriately held by the buffer frame disposed laterally at the carrying unit, wherein each of the restricting rods has another end capable of advancing and retreating movably and adjacent to the abutting portion, and the another end forms an annular portion engageable with a spring, wherein another end of the spring is engageable with one end of the buffer frame, such that the restricting rods are always abutting forward, wherein the posterior end of each of the restricting rods forms a pipe into which a joint ring element and a cover can be inserted, thereby coupling to the grip rod, wherein an upward end of each of the inverted y-shaped desk legs forms a connecting portion, and at least two concave portions are concavely formed at predetermined segments at the periphery of the connecting portion, to timely admit the abutting portions at the ends of the restricting rods, wherein a hole is disposed centrally and penetratingly at the connecting portion, and two curved grooves corresponding in position to the holes are formed within a predetermined range on the connecting portion, such that pins can penetrate the holes and/or the grooves of the connecting portion when the connecting portion is inserted into the topping unit, wherein a C-shaped fastener is disposed at each of the two ends of each said pin to give a positional restriction thereto, wherein upward ends of the auxiliary connecting elements abut against the bottom of the desk board and are each fastened to corresponding positions on the desk board by a screwing element, wherein a second linking portion is disposed pivotally at each of the downward ends of the auxiliary connecting elements to abut against the back of the front guarding panel, and the auxiliary connecting elements are fastened and fixed to respective positions on the front guarding panel by a screwing element, wherein a bar is pivotally disposed at a predetermined front segment of each of the inverted y-shaped desk legs, and one end of the bar is movably coupled to a third linking portion to abut against a lower portion of the back of the front guarding panel, wherein the bars are fastened and fixed to respective positions on the front guarding panel by a screwing element, wherein, after the angle-adjustment unit has been coupled to the desk board and the front guarding panel, the desk board can be folded up by pulling the grip rod outward by hand to drive the two restricting rods to move outward along with the left and right holding frames, and drive the abutting portions at the front ends of the restricting rods to separate from the concave portions of the connecting portions at the ends of the inverted y-shaped desk legs, such that the desk board can move freely to rotate upward by a predetermined inclination angle, wherein, then the grip rod is pushed inward to drive the two restricting rods to move forward and allow the abutting portions to be inserted into the concave portions of the connecting portion, respectively, such that the desk board can be folded up when rotated by a predetermined inclination angle, so as to maintain precise positional restriction and allow the one and/or more desks to be tilted and folded and thus stacked up without taking up much space. |
