TWI618848B - Step chair - Google Patents

Abstract

A step chair comprises: a pair of legs, each pair of legs respectively comprising a front leg and a rear leg, wherein the top legs of the two rear legs are respectively defined as a seat back support bar; Connected between the middle sections of the pair of legs so that the pair of legs are located on the left and right sides of the seat; and a main stepped plate, comprising a plate body, the two sides of the plate are respectively pivoted Pivot mounted between the two chair back support bars of the pair of legs, and at least one side of the near rear end of the plate body, sliding a sliding pin, so that the plate body of the main step plate rotates to the chair according to the pivot After the face is slightly parallel and the stop pin protrudes from the plate body, the stop pin can abut against the rear side of the seat back support bar, and form a stepped state with the seat surface.

Description

Step chair

The invention relates to a step chair, in particular to a function that can switch between a ladder and a chair.

In home life, it is inevitable to take high-altitude items or replace high-altitude light bulbs. For safety, most people will prepare a ladder at home to facilitate the use of high-altitude items or high places. Maintenance, however, if the ladder is large, the usual usage rate is extremely low, and it is not easy to store, which causes inconvenience in storage.

For this reason, some manufacturers have developed a step chair, such as the Republic of China new patent No. 235446 or as shown in FIG. 16, the step chair has a front leg frame (A) and a rear leg frame (B), the front and rear legs (A, B) respectively comprise a panel (A1, B1), which are pivotally connected with each other by a hinge (H). The panels (A1, B1) of the front and rear legs (A, B) are close together and flush with each other. To form a seat for the user to rest on the seat; or as shown in FIG. 17, after the entire rear stand (B) is turned 180 degrees, the panel (B1) is stacked on the panel of the front stand (A) Above (A1), a ladder is formed.

Although the above-mentioned conventional step chair has the functions of a ladder and a chair, it has the following disadvantages in use:

1. Since the front and rear legs (A, B) are connected by a hinge (H), when the chair function is constructed as shown in Fig. 16, the hinge (H) will be exposed and protruded on the two panels (A1, B1) for forming the seat surface. In addition to being unsightly, it also affects the comfort of the user sitting.

2. When performing the function of switching the chair and the ladder, the user must flip the entire range of the tripod (B) by 180 degrees as shown by the imaginary line of Fig. 17, except that the radius of rotation is extremely large, and it is easy to tap the circumference. In addition to the side items, the entire rear leg (B) is extremely cumbersome, and the switching operation of switching from a chair to a ladder is laborious and unfavorable for the elderly or weak.

In view of this, the inventors of the present invention have added research and innovation, and finally revealed the ladder chair shown in the present invention.

The purpose of the present invention is to provide a step chair comprising: a pair of legs, each pair of legs respectively comprising a front leg and a rear leg, wherein the top legs of the two rear legs are respectively defined as a seat back a support rod; a seat surface connected between the middle portions of the pair of legs, such that the pair of legs are located on the left and right sides of the seat; and a main step plate comprising a plate body, two of the plate body The side is pivotally mounted between the two back support bars of the pair of legs, and at least one side of the near rear end of the plate is slidably provided with a stop pin, so that the plate of the main step plate is according to the pivot Rotating to be slightly parallel to the seat surface and allowing the stop pin to protrude from the plate body, the stop pin can abut against the rear side of the seat back support bar, and form a stepped state with the seat surface for use After being lifted up, or after the retaining pin is retracted into the main body of the main step board, the main step board can be rotated according to the pivot center and stopped at a position slightly parallel to the seat back support rod. It is used to support the back of the user while sitting, to form a seat.

The step chair disclosed in the present invention further comprises a stepped plate, wherein the stepped plate comprises a plate body portion, and the two sides of the plate body portion are pivotally mounted between the two seat back support bars of the pair of legs. And located at the top of the main step plate; at least one connecting rod, two ends of each connecting rod are pivotally mounted between the rear end of the plate body portion of the stepped plate and the plate body of the main step plate, so that the step After the plate body of the plate rotates to be slightly parallel to the seat surface, a step of three steps can be formed with the seat surface and the main step plate for the user to climb; because the rear end of the plate body of the step plate Connecting the connecting rod to the plate body of the main step plate, so when the body portion of the second step plate is subjected to a gravity, the pin of the main step plate abuts against the rear side of the seat back support bar, so that The connecting rod generates a force against the direction of the moment generated by the gravity of the plate body, so that the plate body portion can stably carry the gravity of the user.

The step chair disclosed in the present invention, wherein the plate body of the main step plate and the plate body portion of the step plate respectively comprise a braking portion, so that when the invention is in the chair state, the braking portion can abut the The shoulder provided by the seat back support bar forms a stable seat back.

The step chair disclosed in the present invention, wherein the main step plate is pivotally mounted on the pivot center of the two seat back support bars, and is projected between the front and rear legs of the pair of legs, so that the main step plate is After receiving a gravity, the center of gravity will fall between the front and rear legs of the chair, so that the invention will not fall forward or backward to maintain safe use.

The step chair disclosed in the present invention, wherein the step plate is pivotally mounted on the shafts of the two seat back support bars, the center of which is projected between the front and rear legs of the pair of legs, so that the step plate is After receiving a gravity, the center of gravity will fall between the front and rear legs of the chair, so that the invention will not fall forward or backward to maintain safe use.

The step chair disclosed in the present invention, wherein the front end of the main step board is further pivotally connected to a support rod, and when the main body of the main step board is horizontal with the seat surface, the end of the support rod is abutted Relying on the seat surface to assist in supporting the gravity carried by the main step plate or the step plate.

The step chair disclosed in the present invention further includes a footrest plate, the two sides of the footrest plate are respectively provided with a shaft portion, which is slidably placed in the guide rail between the pair of legs, and the two front legs of the pair of legs are A cross bar is disposed between the foot plates to slide over the rails to straddle the cross bar to support the weight of the user's pedaling.

The step chair disclosed in the present invention, wherein the front end of the footrest plate is respectively provided with an elastic protrusion, so that the front end of the footrest plate is reversed according to the axis of the shaft portion, and can be tightly pressed against the pair of chairs. The foot is located inside the side wall of the lower side of the seat surface, and an outlet is arranged at the rear end of the rail, so that the shaft portion of the foot board can be buckled on the inner side of the side wall of the pair of legs at the lower side of the seat surface The center of the elastic protrusion is rotatably separated from the guide rail from the outlet, and is buckled on the inner side of the side wall of the pair of legs at the lower side of the seat surface, so that the foot board can be hidden in the space at the bottom of the seat surface.

The ladder chair disclosed by the invention can be used as a general seat in normal times. When the user needs to climb up, the main step board, the second step board and the step board are pulled out one by one, and a multi-step can be formed. The ladder form, because the main step board, the second step board and the foot board are extremely light in weight, the user can easily flip or pull out, and is suitable for the elderly or thin users, and is suitable for use by the elderly or thin users. The conventional ladder chair needs to be widely flipped and fixed.

In addition, the step chair disclosed in the present invention does not need to cut and fold the chair surface when switching the ladder and the chair. Therefore, the seat surface of the present invention forms a complete surface without metal protrusions such as hinges. It hides its function as a ladder and is similar in appearance to a general chair and can be used as a general seat.

The desirable entities of the present invention can be clarified by the following description and the accompanying drawings.

(10a) (10b) ‧ ‧ ‧ legs

(11) ‧ ‧ front chair feet

(12) ‧ ‧ rear chair feet

(121)‧‧‧Backrest support bar

(121a) ‧‧‧ Back side

(121b)‧‧‧ Shoulder

(13) ‧‧‧rails

(131)‧‧‧Export

(14) ‧‧‧ crossbar

(15)‧‧‧ Sidewall

(151)‧‧‧ 扣孔孔

(152) ‧‧‧ buckle groove

(20)‧‧‧ Chairs

(21) ‧ ‧ positioning holes

(30)‧‧‧Main ladder

(30a) ‧‧‧ pivot center

(31)‧‧‧ Board

(311)‧‧‧Slide

(313)‧‧‧Metal pipe body

(313a) ‧ ‧ rim ring

(32)‧‧‧ pivot

(33) ‧ ‧ ‧ pin

(331)‧‧‧Shoulder

(34) ‧ ‧ spring

(35) ‧‧ ‧Brake

(36)‧‧‧Support rods

(40) ‧ ‧ step ladder

(40a) ‧ ‧ Center

(41) ‧‧‧ Board Department

(411)‧‧‧Slide

(413)‧‧‧Metal pipe body

(413a) ‧ ‧ rim ring

(42) ‧‧‧Axis

(43)‧‧‧ Connecting rod

(43’) ‧‧ ‧ stop

(431)‧‧‧ Shoulder

(44) ‧ ‧ spring

(45) ‧‧ ‧Brake

(50) ‧‧‧foot board

(51)‧‧‧Axis

(52)‧‧‧Flexible protrusions

(520) ‧ ‧ Center

(F) ‧ ‧ force

(G1) ‧‧‧ Center of gravity

(G2) ‧ ‧ center of gravity

(W1)‧‧‧Gravity

(W2)‧‧‧Gravity

(T) ‧ ‧ direction

1 is a perspective exploded view of the present invention; FIG. 2 is a perspective view showing the main step plate and the second step plate connected to each other by a connecting rod; FIG. 3 is a perspective view showing a seated state of the present invention; 3 is a schematic cross-sectional view of the state shown in FIG. 3; FIG. 5 is a schematic perspective view of the main step board of the present invention; FIG. FIG. 8 is a schematic structural view of a second embodiment of the present invention; FIG. 9 is a schematic view showing the structure of the stop pin of the secondary stepped plate shown in FIG. 8; FIG. 10 is a front view showing the front end of the stepped plate from FIG. FIG. 11 is a schematic perspective view showing the second embodiment of the main step board and the second step board of the present invention; FIG. 12 is a schematic view showing the second embodiment of the main step board and the second step board of the present invention; Figure 13 is a perspective view of the embodiment shown in Figure 12 mounted between the two seat back support bars; Figure 14 is a partial cross-sectional view of the 14-14 direction shown in Figure 13; Figure 15 is a synchronous retraction stop pin of Figure 14 Schematic diagram of the operation of the stop pin; Fig. 16: Schematic diagram of the seat state of the conventional step chair; and Fig. 17: Schematic diagram of the switching operation of the conventional step chair.

Referring to Figures 1 and 2, the present invention relates to a step chair, comprising: a pair of legs (10a, 10b), each pair of legs (10a, 10b) respectively comprising a front leg (11) and a The rear leg (12) defines a top section of the two rear legs (12) as a seat back support bar (121); a seat surface (20) coupled to the pair of legs (10a, 10b) Between the middle sections, the pair of legs (10a, 10b) are located on the left and right sides of the seat (20); and a main step board (30) includes a plate (31), the plate ( 31) on both sides, pivoted (32) between the two seat back support bars (121) of the pair of legs (10a, 10b), and at least one side of the near rear end of the plate body (31), Slider is provided with a stop pin (33); as shown in Figures 5, 6, and 7, the plate body (31) of the main step plate (30) is rotated according to the pivot (32) to be slightly opposite the seat surface (20). After being parallel and the protruding pin (33) protrudes from the plate body (31), the blocking pin (33) can abut against the rear side (121a) of the seat back support bar (121), and the seat surface (20) constituting a stepped state for the user to use for climbing; or as shown in Figs. 1, 3 and 4, after the stopper pin (33) is retracted into the plate body (31) of the main step plate (30), Main step board The plate body (31) of (30) is rotatable according to the center of the pivot shaft (32), and is stopped at a position slightly parallel to the seat back support bar (121) for supporting the back of the user in the sitting state. To form a seat.

As shown in Figures 5, 6, and 7, the user flips the plate body (31) of the main step plate (30) horizontally in a clockwise direction, and pushes the pin (33) outwardly out of the plate body ( After 31), the stopper pin (33) can be abutted against the rear side (121a) of the seat back support bar (121), so that the plate body (31) is in a stable horizontal state, that is, the main step plate (30). After being subjected to a gravity (W1), since the stopper pin (33) can abut against the rear side (121a) of the seat back support rod (121), a torque opposite to the gravity (W1) direction is generated, Effectively block the main step board (30) The plate body (31) is rotated in a counterclockwise direction according to the pivot shaft (32), so that the main step plate (30) of the present invention can effectively support the weight of the user to form a stable ladder step.

As shown in FIG. 1 and FIG. 6, the step chair disclosed in the present invention, wherein the stopper pin (33) is slidably disposed in a plate body (31) of the main step plate (30), and is in a sliding hole (311). Between the sliding hole (311) and the blocking pin (33), a spring (34) is elastically supported, so that the spring (34) constantly pushes the locking pin (33) outward, so that the blocking pin (33) After the front end is disengaged from the seat back support bar (12), the plate body (31) is automatically extended outward. In the above sliding hole (311), a metal pipe body (313) is sleeved, and in addition to enhancing the strength of the sliding hole (311), the blocking pin (33) can also be smoothly slid inside. The metal tube body (313) has a flange portion (313a) at its front end to block a shoulder portion (331) of the stopper pin (33) to block the stopper pin (33) from the sliding hole (311). ) slides out.

As shown in Figures 1, 2, 3, 4 and 7, the ladder chair disclosed in the present invention further comprises a stepped plate (40), the stepped plate (40) comprising a plate portion (41) on the plate Two sides of the body (41) are respectively pivotally mounted between the two seat back support bars (121) of the pair of legs (10a, 10b) by a shaft (42), and are located above the main step plate (30); a connecting rod (43), two ends of each connecting rod (43), pivoted to a rear end of the plate body portion (41) of the second step plate (40) and a plate body of the main step plate (30) ( 31), the plate body portion (41) of the step plate (40) is rotated by the shaft (42) to be slightly parallel to the seat surface (20), and the seat surface (20) and the main step can be The plate (30) forms a third-order step for the user to climb; since the rear end of the plate body (41) of the step plate (40) is the plate to which the connecting rod (43) is connected to the main step plate (30) The body (31), therefore, as shown in Fig. 7, after the plate body portion (41) of the secondary step plate (40) is subjected to a force (W2), the pin (33) of the main step plate (30) is abutted. Relying on the rear side (121a) of the seat back support bar (121), the connecting rod (43) produces a direction opposite to the moment generated by the gravity (W2) of the plate body portion (41) The force (F) enables the plate body portion (41) to stably carry the user's gravity (W2).

As shown in FIGS. 8 and 9, the step chair disclosed in the present invention further includes a stepped plate (40), wherein the stepped plate (40) includes a plate body portion (41), and the plate body portion (41) The two sides are respectively pivotally mounted on the two seat back support bars (121) of the pair of legs (10a, 10b) by a shaft (42), and are located on the main step plate (30) At least one stop pin (43') is slidably disposed on at least one side of the proximal end of the plate body portion (41) of the step plate (40), so that the plate body portion of the step plate (40) After the shaft (42) is rotated to be slightly parallel to the seat surface (20) and the stop pin (43') protrudes from the plate body portion (41), the stop pin (43') can be abutted The rear side (121a) of the seat back support bar (12) is in a stable state, and forms a multi-step stepped state with the seat surface (20) and the main step plate (30).

As shown in FIGS. 8 and 9, the stop pin (43') is slidably placed in the plate portion (41) of the step plate (40), and is in the sliding hole (411), and is in the sliding hole (411). Between the stop pin (43'), a spring (44) is elastically supported, so that the spring (44) constantly pushes the stop pin (43') outward, so that the stop pin (43') The front end of the board temporarily protrudes the board body (41). In the above-mentioned sliding hole (411), a metal pipe body (413) is sleeved, and in addition to enhancing the strength of the sliding hole (411), the stopping pin (43') can also be smoothly slid inside. The metal pipe body (413) has a flange portion (413a) at its front end to block a shoulder portion (431) of the stopper pin (43') to block the stopper pin (43'). The sliding hole (411) slides outward.

As shown in FIG. 4, the ladder chair disclosed in the present invention, wherein the plate body (31) of the main step plate (30) and the plate body portion (41) of the second step plate (40) respectively comprise a braking portion ( 35 or 45), when the present invention is in the chair state, the braking portion (35 or 45) can abut against the shoulder (121b) provided by the seat back support bar (121) to form a stable seat. Backrest.

As shown in FIG. 7, the step chair disclosed in the present invention, wherein the main step plate (30) is pivotally mounted on the pivot center (30a) of the two seat back support bars (121), and is projected on the pair of chairs. The front and rear legs (11, 12) of the feet (10a, 10b), after the main step plate (30) is subjected to a gravity (W1), the center of gravity (G1) will fall on the pair of legs (10a, 10b). Between the front and rear legs (11, 12), the present invention does not tilt forward or backward to maintain safe use.

As shown in FIG. 7, the step chair disclosed in the present invention, wherein the step board (40) is pivotally mounted on the shaft (42) of the two seat back support bars (121), the center (40a) of which is projected on Between the front and rear legs (11, 12) of the pair of legs (10a, 10b), the center of gravity (G2) will fall after the step plate (40) is subjected to a gravity (W2). Between the front and rear legs (11, 12) of the legs (10a, 10b), the present invention does not tilt forward or backward to maintain safe use.

As shown in FIG. 1, 5, and 7, the ladder chair disclosed in the present invention, wherein the front end of the plate body (31) of the main step plate (30) is further pivotally connected to a support rod (36), so that the main ladder When the plate body (31) of the plate (30) is horizontal with the seat surface (20), the end of the support rod (36) can abut against or abut against the seat surface (20) (20) Correspondingly, the positioning hole (21) is provided to assist the gravity of the main stepped plate (30) and the second stepped plate (40).

As shown in FIG. 1 and FIG. 5, the step chair disclosed in the present invention further includes a footrest plate (50). The two sides of the footrest plate (50) are respectively provided with a shaft portion (51), and are slidably placed on the pair of chairs. The legs (10a, 10b) are respectively disposed in the guide rails (13), and a cross bar (14) is disposed between the two front legs (11) of the pair of legs (10a, 10b), so that the foot plates (50) When the guide rail (13) slides outward, it is placed on the crossbar (14) to support the weight of the user to step on.

As shown in FIG. 8 , the step chair disclosed in the present invention, wherein the front end of the foot plate (50) is respectively provided with an elastic protrusion (52); as shown in FIG. 10, the foot board (50) is provided. The front end is turned upside down according to the axis of the shaft portion (51), and the pair of legs (10a, 10b) are located inside the side walls (15) of the two sides below the seat surface (20), and An outlet (131) is disposed at a rear end of the guide rail (13). As shown in FIG. 10, the shaft portion (51) of the footrest plate (50) is located at the pair of legs (10a, 10b). The center (520) of the elastic protrusion (52) on the inner side of the side wall (15) on the lower sides of the face (20) is rotatably disengaged from the guide rail (13) from the outlet (131), and is slidably buckled on the pair of legs ( 10a, 10b) located inside the side wall (15) of the two sides below the seat surface (20), as shown in Fig. 11, so that the foot board (50) can be hidden in the space at the bottom of the seat surface (20), the user When it is needed, remove it from under the seat surface (20).

As shown in FIGS. 8 and 10, the elastic protrusions (52) on both sides of the front end of the footrest plate (50) are elastically buckled into the pair of legs (10a, 10b) under the seat surface (20). In the button hole (151) recessed on the inner side of the side wall (15) on both sides; as shown in Fig. 11, the shaft portion (51) on both sides of the rear end of the foot plate (50) can correspond to The ground slider is fastened to the pair of legs (10a, 10b) in a recessed groove (152) recessed on the inner side of the side wall (15) below the seat surface (20).

As shown in Figures 12-15, the ladder chair disclosed in the present invention further includes a stepped plate (40), the stepped plate (40) including a plate body portion (41), and the plate body portion (41) Two sides are respectively pivotally mounted between the two seat back support bars (121) of the pair of legs (10a, 10b) by a shaft (42) and above the main step plate (30); at least one stop pin ( 43'), sliding at least one side of the proximal end of the plate body portion (41) of the step plate (40); at least one connecting rod (43), the two ends of the connecting rod (43) are respectively pivoted The plate body portion (41) of the step plate (40) and the plate body (31) of the main step plate (30) are connected to the stop pin (33) of the main step plate (30) and the step a stop pin (43') of the plate (40), wherein the stop pin (33) is slided into the plate body (31) of the main step plate (30) in a sliding hole (311), and in the sliding hole (311) elastically supporting a spring (34) between the retaining pin (33), and generally elastically pushing the retaining pin (33) outward; the retaining pin (43') is slidingly placed on the step The plate body portion (41) of the plate (40) is in a sliding hole (411), and between the sliding hole (411) and the stopping pin (43'), elastically supports a spring (44), usually External elastic push Stopper pin (43 '). If the user moves the linkage lever (43) in the T direction as shown in FIG. 15, the linkage pin (33) and the stopper pin (43') can be synchronously linked to make the stopper pin (33) and The stop pin (43') is synchronously retracted into the plate body (31) of the main step plate (30) and the plate body portion (41) of the second step plate (40), and is unlocked from the seat back support bar (121). The user can turn the main step board (30) and the second step board (40) downwards in time to make the present invention form a use form of the seat. Or as shown in FIG. 13, when the plate body (31) of the main step plate (30) and the plate body (41) of the second step plate (40) are slightly parallel, the springs (34, 44) can be The stopper pin (33) and the stopper pin (43') are automatically pushed outward and abut against the rear side (121a) of the seat back support bar (121) to form a stable stepped structure.

The step chair disclosed in the present invention, wherein the pair of legs (10a, 10b), the seat surface (20), the main body plate (30) plate body (31), and the second step plate (40) plate body portion (41 And the footboard (50) can be made from logs, glues, compression plates, recycled materials or plastics, and the invention is not self-limiting.

The ladder chair disclosed in the present invention can be used as a general seat in normal times, as shown in FIGS. 3 and 4, when the user needs to climb up, the main step board can be flipped one by one as shown in FIGS. 5 and 7. After the step board (40) and the foot board (50) are pulled out, a multi-step ladder form can be formed, because the main step board (30), the second step board (40) and the foot board (50) The quality is extremely light, and the user can easily flip or pull out. In addition to being suitable for general users, it is more suitable for the elderly or thin users, and the disadvantage of requiring a wide range of turning and fixing is known.

In addition, the step chair disclosed in the present invention does not need to cut and fold the seat surface when switching the ladder and the chair, so the seat surface of the present invention forms a complete surface, and can completely hide the function of the ladder. It is similar in appearance to a general chair and can be used as a general seat.

The ladder chair disclosed in the present invention can be modified and applied without departing from the spirit and scope of the present invention, and the present invention is not limited to the above embodiment.

Claims (10)

A step chair comprises: a pair of legs, each pair of legs respectively comprising a front leg and a rear leg, wherein the top legs of the two rear legs are respectively defined as a seat back support bar; Connected between the middle sections of the pair of legs so that the pair of legs are located on the left and right sides of the seat; and a main stepped plate containing a plate body, pivotally pivoted on both sides of the plate Between the two chair back support bars of the pair of legs, and at least one side of the near rear end of the plate body, a stop pin is slid so that the plate body of the main step plate rotates to the chair surface according to the pivot After being parallel and the protruding pin protrudes from the plate body, the blocking pin can abut against the rear side of the seat back support bar, and form a stepped state with the seat surface. The step chair of claim 1, wherein the stop pin is disposed in a sliding hole of the main step plate, and elastically supports a spring between the sliding hole and the blocking pin. The step chair of claim 1, further comprising a stepped plate, wherein the stepped plate comprises a plate body portion, and the two seat back support bars pivotally mounted on the pair of legs respectively on one side of the plate body portion And at least one connecting rod, the two ends of each connecting rod are pivotally mounted between the rear end of the body portion of the stepped board and the main body of the main step board, so that After the plate body of the secondary step plate is rotated to the axis slightly parallel to the seat surface, a step of three steps can be formed with the seat surface and the main step plate. The step chair of claim 1, further comprising a stepped plate, wherein the stepped plate comprises a plate body portion, and the two seat back support bars pivotally mounted on the pair of legs respectively on one side of the plate body portion And located above the main step plate; at least one stop pin is slidably disposed on the step plate At least one side of the proximal end of the plate body, such that the plate body portion of the stepped plate is rotated by the axis to be slightly parallel to the seat surface and the stop pin protrudes from the plate body portion, the stop pin It can be abutted against the rear side of the seat back support bar, and is in a stable state, and forms a multi-step stepped state with the seat surface and the main step plate. The step chair of claim 4, wherein the stop pin is slidably disposed in a sliding hole of the plate body portion of the stepped plate, and elastically supports a spring between the sliding hole and the stopping pin . The step chair according to claim 1, further comprising a step plate, wherein the step plate comprises a plate body portion, and two sides of the plate body portion are respectively pivotally mounted on the two chair back supports of the pair of legs Between the rods, and located above the main step plate; at least one stop pin is slidably disposed on at least one side of the proximal end of the plate body portion of the step plate; at least one connecting rod, the two ends of the connecting rod are respectively pivoted Between the body portion of the step plate and the plate body of the main step plate, and connecting the stop pin of the main step plate and the stop pin of the step plate, wherein the pin is sliding on the main The plate of the step plate is in a sliding hole, and between the sliding hole and the blocking pin, elastically supports a spring, and the elastic locking pin is normally elastically pushed outward; the stopping pin is slidingly placed on the step plate The body of the plate is in a sliding hole, and between the sliding hole and the stopping pin, a spring is elastically supported, and the stopping pin is normally elastically pushed outward. The step chair of claim 1, wherein the front end of the main step board is further pivotally connected to a support rod, and when the main body of the main step board is horizontal with the seat surface, the end of the support rod is Abutting against the seat surface or against a corresponding positioning hole of the seat surface. The step chair of claim 1, 3 or 4, further comprising a footrest plate, wherein the two sides of the footrest plate are respectively provided with a shaft portion, which is slidably placed in a guide rail provided by the pair of legs, and the Correct A cross bar is arranged between the two front legs of the chair foot, so that when the foot plate slides out according to the guide rail, the cross bar is placed on the cross bar. The step chair of claim 8, wherein the front end of the footrest plate is respectively provided with an elastic protrusion; the front end of the footrest plate is reversed according to the axis of the shaft portion, and The legs are located inside the side walls of the lower side of the seat surface, and an outlet is arranged at the rear end of the rail, so that the shaft portion of the footrest can be buckled on the side walls of the pair of legs at the lower sides of the seat surface The center of the inner elastic protrusion is rotatably disengaged from the guide rail from the outlet, and is slidably engaged with the pair of legs on the inner side of the side walls below the seat surface. The step of claim 9, wherein the elastic protrusions on both sides of the front end of the footrest are elastically buckled into the recessed holes of the pair of legs on the inner side of the side walls below the seat surface; The shaft portions on the two sides of the rear end of the footrest plate are correspondingly buckled in the buckle grooves recessed inside the side walls of the pair of legs at the lower sides of the seat surface.