CN110754833A

CN110754833A - Portable stool

Info

Publication number: CN110754833A
Application number: CN201810833583.4A
Authority: CN
Inventors: 丁杰
Original assignee: Xi'anyoubihui Electronic Technology Co Ltd
Current assignee: Xi'anyoubihui Electronic Technology Co Ltd
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2020-02-07

Abstract

The invention provides a portable stool which comprises a supporting mechanism and a bearing part fixed at the top of the supporting mechanism, wherein the supporting mechanism comprises a main bearing part which is supported and loaded in a grounding mode and a supporting mechanism which moves up and down along the main bearing mechanism to unfold, fold and support the bearing part. The supporting mechanism comprises at least three supporting pieces which are uniformly arranged around the circumference of the main bearing piece, and a guide limiting piece which is fixed at the top end of the main bearing mechanism and used for realizing the guide opening and closing of the supporting pieces. The portable stool has the same volume as a horizontal stool, can be hung on a waist or a backpack, and is very convenient to carry and secret.

Description

Portable stool

Technical Field

The invention relates to a portable stool.

Background

When going out in a city, most people take a subway or a bus, but no seat is available on the subway or waiting for the bus, and the people are tired for the old or the young, so that people develop a plurality of portable stools, such as the folding stool disclosed in the Chinese patent invention with the application number of 98810406.7, which has the advantages of simple structure, small size and portability, but still has larger volume, and cannot be carried like a water bottle, such as hung on a waist or a backpack, because the people carry an article with too obvious volume on the crowded subway or the bus, so that the people cannot go through the subway or the bus conveniently.

Disclosure of Invention

The invention aims to provide a portable stool capable of being hung on a waist or a backpack.

In order to achieve the purpose, the invention provides a portable stool, which comprises a supporting mechanism and a supporting part fixed at the top of the supporting mechanism, wherein the supporting mechanism comprises a main bearing part which contacts the ground to support and bear and a supporting mechanism which moves up and down along the main bearing mechanism to unfold, fold and support the supporting part.

The supporting mechanism comprises at least three supporting pieces which are uniformly arranged around the circumference of the main bearing piece, and a guide limiting piece which is fixed on the top end of the main bearing mechanism and used for realizing the guide opening and closing of the supporting pieces.

The lower end of the supporting piece is hinged with a movable fixed seat which is sleeved on the outer wall of the main supporting piece and can move up and down;

the guide limiting part comprises a fixed seat fixed on the outer wall of the top end of the main bearing part and at least three connecting pieces uniformly arranged around the circumference of the main bearing part;

the upper end of the connecting piece is hinged with the fixed seat, and the lower end of the connecting piece is hinged with the middle part of the supporting piece in the length direction;

the outer wall of the main bearing part is provided with a movable fixing seat limiting device positioned below the fixing seat, and the movable fixing seat limiting device is used for preventing the movable fixing seat from sliding downwards when the movable fixing seat moves to the upper end of the main bearing part, so that the movable fixing seat is limited between the fixing seat limiting device and the fixing seat.

The guide limiting part comprises a fixed seat fixed on the outer wall of the top end of the main bearing part and at least three connecting pieces uniformly arranged in the circumferential direction of the main bearing part;

the side wall of the main bearing part is provided with a chute, a vertical groove and a T-shaped limit pin, and the upper end of the vertical groove is communicated with the chute; the transverse part of the T-shaped limiting pin is arranged in the vertical groove, and the length of the transverse part is larger than the size of the notch of the inclined groove, so that the T-shaped limiting pin is prevented from being pulled out; the vertical part of the limiting pin extends out of the vertical groove and is hinged with the lower end of the supporting piece;

the width of the notch of the chute is smaller than that of the lower end of the supporting piece, and the inner side surface of the supporting piece is provided with a surface matched with the upper inclined surface of the notch.

The fixing seat limiting device is a spring pin or a wedge-shaped spring guide block which is vertically arranged on the main bearing part;

the wedge-shaped spring guide block consists of a wedge-shaped block and an elastic sheet;

the inner side of the wedge-shaped block is fixedly connected with the inclined outward extending piece of the elastic piece, and the bottom surface of the wedge-shaped block is overlapped with the top surface of the horizontal part of the elastic piece and then fixed on the hole wall of the limiting device mounting hole on the main bearing part together with the horizontal part.

The supporting piece and the guide limiting piece are both wedge-shaped blocks, and the inclined surfaces of the supporting piece and the guide limiting piece are oppositely spliced to form a rectangle;

the extension line of the inclined plane of the support is at an angle of 35-55 degrees with the axis of the main bearing and extends from top to bottom to intersect with the axis;

the supporting piece and the guide limiting piece are embedded together through guide blocks or guide grooves formed on the inclined surfaces opposite to each other and can slide relative to each other;

the opposite side surfaces of the guide block or the guide groove are respectively provided with a guide limiting strip or a guide limiting groove, and the guide limiting strip and the guide limiting groove are mutually embedded to realize transverse limiting between the guide block and the guide groove and prevent the guide block and the guide groove from slipping;

or the guide block is a T-shaped guide block, and the cross section of the guide groove is a trapezoidal guide groove;

the top end of the guide groove is provided with a limiting plug or a limiting pin to prevent the guide block from sliding out;

the top end of the inclined plane of the guide limiting part is provided with a transverse spring pin which is used for abutting against the lower end of the supporting part when the supporting part is positioned at the top end of the guide limiting part so as to stop the downward sliding of the supporting part.

The main bearing part consists of a tubular part at the top and a base arranged at the bottom end of the tubular part;

the base is composed of three tile supporting pieces which are uniformly arranged along the circumferential direction of the tubular piece;

the top ends of the tile supporting pieces are hinged with the bottom end of the tubular piece, and the three tile supporting pieces form a tubular shape after being gathered together;

or the base is composed of a central disk and three supporting pieces hinged with the central disk;

the three supporting pieces are uniformly arranged on the bottom surface of the central disc, and rotatably extend out of or retract to the bottom surface of the central disc through a hinge pin shaft.

Three limiting holes are formed in the central disc; the top surfaces of the three supporting sheets are respectively provided with a limiting lug with an arc-shaped top surface, and the limiting lug is clamped into the limiting hole when the three supporting sheets extend out of the bottom surface of the central disc.

The invention has the advantages that: the volume is small and portable.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic view of a portable bench in an unfolded state.

Fig. 2 is a schematic view of a portable bench in a half-deployed state.

Fig. 3 is a schematic view of a portable bench when collapsed.

Fig. 4 is a schematic view showing a state where the wedge spring guide block is mounted.

Figure 5 is a schematic view of a bearing construction.

Fig. 6 is a schematic view of a base structure.

Figure 7 is a schematic view of an alternative racking mechanism.

Fig. 8 is a schematic view of the guide block and the stop strip.

Fig. 9 is a schematic view of the guide groove and the stopper groove.

Figure 10 is a schematic view of an alternative embodiment of the racking mechanism shown in a collapsed position.

Fig. 11 is a state view when the portable bench is taken out of the storage bottle.

FIG. 12 is a schematic view of a movement limiting mechanism consisting of a chute, a vertical slot and a T-shaped limiting pin.

Fig. 13 is a side force schematic of fig. 12.

Description of reference numerals: 1. a support member; 2. a main bearing; 3. a support member; 4. a guide limit piece; 5. moving the fixed seat; 6. a fixed seat; 7. a connecting member; 8. moving the fixed seat limiting device; 9. a wedge block; 10. a tab extending obliquely outward; 11. a horizontal portion; 12. mounting holes; 13. a guide block; 14. a guide groove; 15. a limiting strip; 16. a limiting groove; 17. a tubular member; 18. a base; 19. a tile support; 20. a central disc; 21. a support sheet; 22. a limiting hole; 23. a limiting bump; 24. a chute; 25. a vertical slot; 26. a T-shaped limit pin; 27. an upper inclined plane.

Detailed Description

Fig. 1, 2 and 3 show a portable stool, which includes a supporting mechanism and a supporting member 1 fixed on the top of the supporting mechanism, and the greatest difference between the portable stool provided in this embodiment and the existing stool is that the supporting mechanism includes a main supporting member 2 which supports and bears when touching the ground and a supporting mechanism which moves up and down along the main supporting mechanism to unfold, fold and support the supporting member 1. The supporting member 1 is a member for directly supporting a human body when the stool is used, and can be made of wood, steel, iron, aluminum, mesh cloth, oxford cloth or other materials, and for the convenience of storage and expansion, the supporting member is made of mesh cloth, oxford cloth, rope woven materials or various common cloth or other flexible materials.

The supporting mechanism comprises at least three supporting pieces 3 uniformly arranged around the circumference of the main bearing piece 2 and a guide limiting piece fixed at the top end of the main bearing mechanism to realize the guide opening and closing of the supporting pieces 3, wherein the supporting pieces 3 are shown in fig. 1.

The lower end of the supporting part 3 is hinged with a movable fixing seat 5 which is sleeved on the outer wall of the main bearing part 2 and can move up and down, wherein the movable fixing seat 5 can be a circular ring part, so that the movable fixing seat is sleeved on the main bearing part 2 which is shaped like an outer circular tube, the axial up-and-down movement along the main bearing part 2 is realized, and the supporting part 3 hinged with the movable fixing seat is driven to move up and down.

The guiding position-limiting element comprises a fixed seat 6 fixed on the outer wall of the top end of the main bearing element 2 and at least three connecting pieces 7 uniformly arranged around the circumference of the main bearing element 2, as can be seen from fig. 1, the fixed seat 6 is also a circular ring piece fixedly sleeved on the top end of the main bearing element 2, and of course, the fixed seat can also be a protruding circular ring integrally formed with the top end of the main bearing element 2; the upper end of the connecting piece 7 is hinged with the fixed seat 6, and the lower end of the connecting piece 7 is hinged with the middle part of the supporting piece 3 in the length direction, so that when the movable fixed seat 5 moves up and down along the axial direction of the main bearing piece 2, the supporting piece 3 is restrained by the connecting piece 7, and moves relative to the main bearing piece 2, the supporting piece 1 (such as oxford fabric) connected with the top end of the supporting piece 3 is stretched and unfolded outwards, and when the movable fixed seat 5 moves to the lower end of the fixed seat 6 and cannot move any more, 3 supporting pieces 3 are in a final and maximum open state, so that the supporting piece 1 (such as oxford fabric) is stretched and tightened to form a supporting surface with a certain supporting force, and the support of a person sitting on the supporting surface can be realized.

In order to maintain the continuous support of the supporting piece 1 to the human body, a movable fixing seat limiting device 8 located below the fixing seat 6 is arranged on the outer wall of the main bearing piece 2 and used for preventing the movable fixing seat 5 from sliding downwards when the movable fixing seat 5 moves to the upper end of the main bearing piece 2, so that the movable fixing seat 5 is limited between the fixing seat limiting device 8 and the fixing seat 6.

The fixing seat limiting device 8 adopted in the embodiment is a spring pin or a wedge-shaped spring guide block which is vertically installed (installed perpendicular to the axis of the main bearing part 2) on the main bearing part 2; the spring catch is a common component, the application is that another component moves relative to a component in order to clamp the assembly, only external force is needed to push back the ejector pin along the circumferential direction, after the movable fixing seat 6 moves between the fixing seat 5 and the spring catch after passing, the external force is cancelled, the ejector pin of the spring catch can be popped out to block the lower end of the movable fixing seat 6, the movable fixing seat 6 can be effectively prevented from sliding downwards by bearing, otherwise, when the movable fixing seat 6 needs to move downwards, only external force is needed to push back the ejector pin, and the movable fixing seat 6 is moved downwards until the inner ring of the movable fixing seat 6 butts against the ejector pin and then continues to slide downwards to move the movable fixing seat 6.

The wedge-shaped spring guide block is composed of a wedge-shaped block 9 and a spring plate shown in fig. 4, of course, this structure is also a common stop limit mechanism, such as a limit mechanism on a rain umbrella, while the inner side of the wedge-shaped block 9 in this embodiment is fixedly connected with an inclined outward extending piece 10 of the spring plate, and the bottom surface of the wedge-shaped block 9 is overlapped with the top surface of a horizontal part 11 of the spring plate and then fixed on the hole wall of a limit device mounting hole 12 on the main bearing part 2 together with the horizontal part 11. Thus, when the movable fixing seat 6 moves up and down, the wedge block 9 is pushed and pressed inwards by external force, or the movable fixing seat 6 is pushed upwards, by means of the inclined plane guide effect of the wedge block 9, the wedge block 9 is pushed and pressed inwards when the movable fixing seat 6 moves upwards until the movable fixing seat 6 moves to the position above the wedge block 9, the wedge block 9 is restored to the original state under the action of the elastic sheet, so that the movable fixing seat 6 is blocked between the fixing seat 5 and the wedge block 9 by means of the top surface of the wedge block 9, the support member 3 is continuously supported, when needing to be folded, the wedge block 9 is pushed and pressed inwards by hand, so that the movable fixing seat 6 moves downwards, the support member 3 hinged with the movable fixing seat 3 is driven to move downwards, and the support member 3 is folded inwards (close to the main support member 2) under the action of the connecting member 7 and the fixing seat 5, until the support member 3 and the connecting member 7 are folded and unfolded on the, it should be noted that the connecting member 7 provided in this embodiment is a rigid channel, so when the supporting member 3 is folded, when the connecting member 7 rotates around the hinge of the fixing seat 6 or the hinge (such as a rotating shaft, a pin shaft, or a ball bearing), the supporting member 3 is pressed outward, until the outer end of the connecting member 7 slides over the farthest horizontal point with the radius of the connecting member 7, the supporting member 3 is retracted inward, until the connecting member 7 is folded into the channel of the supporting member 3 (the supporting member 3 also adopts a channel, and for the purpose of smaller volume after being folded, the channel of the supporting member 3 and the channel of the connecting member 7 are oriented in the same direction, both facing the side of the main supporting member 2), so that the side wall of the supporting member 3, which is basically closely attached to the main supporting member 2, is folded. The connecting piece 7 in the form adopts a channel-like steel structure as the connecting piece, obviously, the opening and closing difficulty is increased, the supporting piece 1 is required to have better ductility in order to reduce the strength requirement during opening and closing or closing, and if oxford is adopted, the connecting piece can be properly enlarged under the pulling action of external force, so that the connecting piece of the rod piece type structure provided by the embodiment is met.

As can be seen from fig. 1 and particularly fig. 2, the supporting member 3 and the connecting member 7 provided in this embodiment both have the same shape as the channel steel, and by adopting this shape, not only can the rigidity be enhanced, thereby providing sufficient supporting force, but also the connecting member 7 can be accommodated in the groove of the supporting member 3 when being folded, and the volume after being folded is further reduced, therefore, a staggered and hinged manner of the connecting member 7 and the supporting member 3 can be adopted, which not only increases the volume, but also provides higher stress requirements for the hinge pin of the connecting member 7 and the supporting member 3, and will have higher requirements for the rigidity of the material, and inevitably increase the cost.

When the supporting member 3 moves downward relative to the main supporting member 2 along with the movable fixing seat 5, the supporting member is in a state of obliquely downward and inward folding, so that the outward pulling force on the supporting member 1 (such as oxford) is cancelled, and meanwhile, the supporting member 1 (such as oxford) is driven to move downward until the supporting member 3 and the connecting member 7 are both in a state of being basically parallel to the axis of the main supporting member 2, at this time, the supporting member 1 (such as oxford) is folded at the top end of the main supporting member 2, and the whole supporting mechanism is in an idle folded state, namely a state shown in fig. 3.

In order to further simplify the structure, the present embodiment provides another structure that does not require the movable fixing base 5, specifically: the guide limiting part 4 comprises a fixed seat 6 fixed on the outer wall of the top end of the main bearing part 3 and at least three connecting pieces 7 uniformly arranged around the circumference of the main bearing part 2; the upper end of the connecting piece 7 is hinged with the fixed seat 6, and the lower end of the connecting piece 7 is hinged with the middle part of the supporting piece 3 in the length direction;

a chute 24 (the notch of which is inclined upwards, so that the rod piece inserted into the notch of the main bearing 2 is in a fork shape, and the notch of the side surface looks like a letter V), a vertical groove 25 and a T-shaped limit pin 26 are arranged on the side wall of the main bearing 2, and as shown in fig. 12 and 13, the upper end of the vertical groove 25 is communicated with the chute 24; the transverse part of the T-shaped limiting pin 26 is arranged in the vertical groove 25, and the length of the transverse part is larger than the size of the notch of the inclined groove 24, so that the pulling-out is avoided; the vertical part of the limit pin 26 extends out of the vertical slot 25 and is hinged with the lower end of the support 3. Through the limiting mechanism with the structure, when the support member 3 moves upwards, the support member 3 moves outwards under the action of the connecting piece 7 and moves upwards under the action of external force, the support member 3 moves upwards along the vertical groove 25 under the limiting action of the vertical part of the T-shaped limiting pin 26 without swinging or circumferential rotation, when the lower end of the support member 3 moves to the notch of the inclined groove 24, the external force enables the lower end of the support member 3 to be inserted into the inclined groove 24 (the width of the notch of the inclined groove 24 is smaller than that of the lower end of the support member 3, and the inner side surface of the support member 3 is provided with a surface which is matched with the upper inclined surface 27 of the notch), namely, the action of opening the support member 3 outwards is completed, so that the support member 3 is in an outwards opening state under the action of the connecting piece 7 and the inclined groove 24, and cannot slide downwards or swing circumferentially under the limiting action of the inclined groove 24, so far, accomplish strutting of bench, can ensure that supporting member 1 forcefully accomplishes bearing to the human body, and when needs are packed up the bench, upwards remove support piece 3 earlier, leave the notch of chute 24 when the lower extreme of support piece 3, outwards rotate the lower extreme of support piece 3, pull support piece 3 downwards simultaneously to accomplish drawing in of support piece 3. The structure is simple, and when the connecting piece is opened or folded, the inward extrusion effect of the supporting piece 3 on the connecting piece 7 is effectively avoided, and the force required in the process of opening or folding the supporting piece 3 is greatly reduced.

The present embodiment provides a main bearing 2 composed of a top tubular member 17 shown in fig. 5 and a base 18 provided at the bottom end of the tubular member 17; wherein the base 18 is formed by three tile supports 19 (i.e. shaped like tiles and having a C-shaped cross section) arranged uniformly along the circumference of the tubular member 17; the top of tile support piece 19 is articulated with the bottom of tubulose 17, and constitute the tubulose after this three tile support piece 19 gathers together, and three tile support piece 19 opens the back as shown in fig. 1 or fig. 5, the bottom outwards extends to support subaerial, the top is articulated with the lower extreme of tubulose 17, thereby constitute triangle tripod power, realize the triangular supports to tubulose 17, and then realize the triangular supports to whole supporting mechanism, ensure the stability in use of this portable bench, of course, can thicken the top of three tile support piece 19 and the lower extreme of tubulose 17, and the thickness inwards extends, thereby increase the area of contact of tile support piece 19 and tubulose 17, further promote the stability of using, avoid the damage that the small area touch-press caused simultaneously, prolonged service life.

Of course, the base shown in fig. 6 may also be adopted, that is, the base 18 is composed of a central disk 20 fixedly connected to the lower end of the tubular member 17, and three supporting pieces 21 hinged to the central disk 20, the three supporting pieces 21 are uniformly arranged on the bottom surface (the top surface is also possible) of the central disk 20, and rotatably extend out from or retract to the bottom surface of the central disk 20 through a hinge pin shaft, and in order to ensure stability, three limiting holes 22 are provided on the central disk 20; the top surfaces of the three support sheets 21 are respectively provided with a limit bump 23 with an arc-shaped top surface, so that the limit bumps 23 are clamped into the limit holes 22 when the three support sheets 21 extend out of the bottom surface of the central disk 20, and the limit bumps 23 are forcibly pushed out of the limit holes 22 when the three support sheets 21 are retracted.

Fig. 7 shows another construction of the supporting mechanism, in which the supporting member 3 and the guiding position-limiting member 4 are wedge-shaped blocks, and they are assembled into a rectangle with their inclined surfaces facing each other; and the extension line of the inclined plane of the support 3 forms an angle of 35-55 degrees with the axis of the main bearing 2 and extends from top to bottom to intersect with the axis of the main bearing 2; the supporting piece 3 and the guide limiting piece 4 are embedded together through a guide block 13 or a guide groove 14 which are arranged on the inclined surfaces opposite to each other, and can slide relative to each other; the opposite side surfaces of the guide block 13 or the guide groove 14 are respectively provided with a guide limiting strip 15 shown in fig. 8 or a guide limiting groove 16 shown in fig. 9, and the transverse limiting between the guide block 13 and the guide groove 14 is realized by the mutual embedding of the guide limiting strip 15 and the guide limiting groove 16, so that the slippage of the guide block 13 and the guide groove 14 is prevented;

or the guide block 13 is designed into a T-shaped guide block, and the cross section of the guide groove 14 is a trapezoidal guide groove; the top end of the guide groove 14 is provided with a limiting plug or a limiting pin to prevent the guide block 14 from sliding out; the top end of the inclined plane of the guide limit part 4 is provided with a transverse spring pin or a wedge-shaped spring guide block, which is used for abutting against the lower end of the support part 3 when the support part 3 is located at the top end of the guide limit part, so as to stop the downward sliding of the support part 3.

In summary, the stool provided by the above embodiments has small volume, is convenient to store and carry, and can be stored in the packing bag or the packing bottle shown in fig. 11 and hung on the waist or the backpack.

Claims

1. A portable bench of sitting, includes supporting mechanism and fixes supporting member (1) at the supporting mechanism top, its characterized in that: the supporting mechanism comprises a main bearing part (2) which is supported and loaded in a touchdown manner and a supporting mechanism which moves up and down along the main bearing mechanism to unfold, fold and support the bearing part (1).

2. The portable bench of claim 1, further comprising: the support mechanism comprises at least three supporting pieces (3) which are uniformly arranged around the circumference of the main bearing piece (2), and a guide limiting piece (4) which is fixed on the top end of the main bearing mechanism and used for realizing the guide opening and closing of the supporting pieces (3).

3. The portable bench of claim 2, wherein: the lower end of the supporting piece (3) is hinged with a movable fixing seat (5) which is sleeved on the outer wall of the main supporting piece (2) and can move up and down;

the guide limiting part (4) comprises a fixed seat (6) fixed on the outer wall of the top end of the main bearing part (2) and at least three connecting pieces (7) uniformly arranged around the circumference of the main bearing part (2);

the upper end of the connecting piece (7) is hinged with the fixed seat (6), and the lower end of the connecting piece (7) is hinged with the middle part of the supporting piece (3) in the length direction;

the outer wall of the main bearing part (2) is provided with a movable fixing seat limiting device (8) located below the fixing seat (6) and used for preventing the movable fixing seat (5) from sliding downwards when the movable fixing seat (5) moves to the upper end of the main bearing part (2), so that the movable fixing seat (5) is limited between the fixing seat limiting device (8) and the fixing seat (6).

4. A portable bench as defined in claim 3, further comprising: the fixed seat limiting device (8) is a spring pin or a wedge-shaped spring guide block which is vertically arranged on the main bearing part (2);

the wedge-shaped spring guide block is composed of a wedge-shaped block (9) and an elastic sheet;

wedge (9) inboard with the slope of shell fragment outwards extends piece (10) fixed connection, the bottom surface of wedge (9) with the top surface of the horizontal part (11) of shell fragment is overlapped the back, is fixed together with this horizontal part (11) on the hole wall of stop device mounting hole (12) on main bearing piece (2).

5. A portable bench as defined in claim 3, further comprising: the guide limiting part (4) comprises a fixed seat (6) fixed on the outer wall of the top end of the main bearing part (2) and at least three connecting pieces (7) uniformly arranged around the circumference of the main bearing part (2);

a chute (24), a vertical groove (25) and a T-shaped limit pin (26) are arranged on the side wall of the main bearing part (2), and the upper end of the vertical groove (25) is communicated with the chute (24); the transverse part of the T-shaped limiting pin (26) is arranged in the vertical groove (25), and the length of the transverse part is larger than the size of the notch of the inclined groove (24), so that the pulling-out is avoided; the vertical part of the limiting pin (26) extends out of the vertical groove (25) and is hinged with the lower end of the support piece (3);

the width of the notch of the chute (24) is smaller than the width of the lower end of the support piece (3), and the inner side surface of the support piece (3) is provided with a surface matched with the upper inclined surface (27) of the notch.

6. The portable bench of claim 2, wherein: the supporting piece (3) and the guide limiting piece (4) are both wedge-shaped blocks, and inclined planes of the wedge-shaped blocks are oppositely spliced to form a rectangle;

the extension line of the inclined plane of the support (3) forms an angle of 35-55 degrees with the axis of the main support (2), and extends from top to bottom to intersect with the axis;

the supporting piece (3) and the guide limiting piece (4) are embedded together through guide blocks (13) or guide grooves (14) which are arranged on the inclined surfaces opposite to each other and can slide relative to each other;

the opposite side surfaces of the guide block (13) or the guide groove (14) are respectively provided with a guide limiting strip (15) or a guide limiting groove (16), and the guide block (13) and the guide groove (14) are transversely limited by the mutual embedding of the guide limiting strip (15) and the guide limiting groove (16), so that the guide block (13) and the guide groove (14) are prevented from slipping;

or the guide block (13) is a T-shaped guide block, and the cross section of the guide groove (14) is a trapezoidal guide groove;

the top end of the guide groove (14) is provided with a limiting plug or a limiting pin to prevent the guide block (13) from sliding out;

the top end of the inclined plane of the guide limiting part (4) is provided with a transverse spring pin which is used for abutting against the lower end of the supporting part (3) when the supporting part (3) is positioned at the top end of the guide limiting part (4) so as to stop the downward sliding of the supporting part (3).

7. A portable bench as claimed in claims 1 to 6, characterized in that: the main bearing (2) is composed of a top tubular part (17) and a base (18) arranged at the bottom end of the tubular part (17);

the base (17) is formed by three tile supports (19) arranged uniformly in the circumferential direction of the tubular element (18);

the top end of the tile supporting piece (19) is hinged with the bottom end of the tubular piece (17), and the three tile supporting pieces (19) form a tubular shape after being gathered;

or the base (18) is composed of a central disk (20) and three supporting pieces (21) hinged with the central disk (20);

the three supporting pieces (21) are uniformly arranged on the bottom surface of the central disc (20), and rotatably extend out of or retract to the bottom surface of the central disc (20) through hinge pin shafts.

8. The portable bench of claim 7, further comprising: three limiting holes (22) are formed in the central disc (20); the top surfaces of the three support sheets (21) are respectively provided with a limit lug (22) with an arc-shaped top surface, and the limit lugs are clamped into the limit holes (23) when the three support sheets (21) extend out of the bottom surface of the central disc (20).