Background
In the field of education and teaching facilities, the desk and chair are used as important tools for daily study of students, and the rationality and the functionality of the design of the desk and chair have remarkable influence on the study experience and the physical health of the students. Along with the development of education ideas and the improvement of physical and mental health attention of students, the functional requirements of the desk and the chair are not limited to meet basic learning requirements any more, and the desk and the chair also need to be suitable for comfort and health requirements of the students in noon break and other scenes.
The back of the seat of the traditional desk is mostly at a fixed angle, and cannot be adjusted according to the actual demands of students, so that the students can only choose the posture of lying on the desk during noon break. The long-term use of the posture for noon break can bring a plurality of adverse effects to the body of students, such as pressing arms to obstruct blood circulation, causing numbness and ache of the arms, and causing abnormal bending pressure to cervical vertebrae and vertebrates, and long-term accumulation can cause physical problems and influence the normal development of the body of students.
In order to solve the defects of the traditional desk and chair in noon break function, various improved designs are developed on the market, wherein the improved designs comprise the noon break desk and chair disclosed in China patent application number 202221369145.5 cited in the patent. The noon break desk and chair improves noon break conditions of students to a certain extent, and the students can approximately lie down for break in noon break through the arrangement of the telescopic rod connecting supporting plate below the desk and chair and the rotation of the backrest.
However, to ensure stability in a lying state, the horizontal stabilizing rail (i.e., the laterally extending legs that rest against the ground) in the support structure of the existing noon break desk and chair is generally longer than the existing conventional chair.
The reason for the length of the horizontal stabilizing cross rod is as follows, as shown in fig. 1, the fig. 1 is a side view of the relationship between a conventional desk and chair support rod 01 and the horizontal stabilizing cross rod 02, as shown in fig. 2, the noon break type desk and chair is improved to be adjustable compared with the conventional desk and chair, and students can conveniently lie for noon break by changing the angle of the backrest 03 compared with a cushion 04, but in the state, the gravity center of the whole desk and chair is located at the rear, the gravity center position point 05 is used for ensuring the stability of the noon break type desk and chair, the length of the horizontal stabilizing cross rod 02 is generally prolonged backwards, the length of the horizontal stabilizing cross rod 06 is prolonged, and after the horizontal stabilizing cross rod is prolonged, the prolonged part 06 is stretched out of the vertical projection of the cushion 04 as shown in fig. 3 when the horizontal stabilizing cross rod is used at ordinary times.
The length of the horizontal stable transverse rod is increased, so that the desk and the chair occupy more space when stacked and stored, the high-efficiency utilization of classroom space is not facilitated, and the horizontal stable transverse rod is longer than the normal length range of a common desk and chair, so that students can easily kick or trip the horizontal stable transverse rod at the part exceeding the normal length when frequently walking in classrooms, and further fall and injury are caused.
Disclosure of utility model
Aiming at the technical problems, the gravity-optimized anti-stumbling noon break seat provided by the utility model can reduce the risk of stumbling of students by the noon break seat.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a gravity-optimized anti-stumbling noon break chair, which comprises a bracket, a base and a backrest, wherein the bracket comprises a first cross rod, a second cross rod, a first supporting rod, a second supporting rod and a supporting frame body, the first cross rod and the second cross rod extend horizontally, the first cross rod and the second cross rod extend in parallel, the upper end of the second supporting rod is inclined relative to the horizontal plane in the horizontal direction perpendicular to the first cross rod, the upper end of the first supporting rod and the two ends of the second cross rod are aligned, the first supporting rod is inclined relative to the horizontal plane, the upper end of the first supporting rod is inclined forward at an angle of 75 degrees, the lower end of the first supporting rod is fixed on the first cross rod, the lower end of the first supporting rod is fixed at 1/4 of the back of the first cross rod, the upper end of the first supporting rod is fixed on the lower side of the supporting frame body, the upper end of the second supporting rod is inclined relative to the horizontal plane, the lower end of the second supporting rod is inclined at an angle of 75 degrees, the lower end of the second supporting rod is fixed on the lower end of the second cross rod is fixed on the second cross rod, the back support body is fixed on the back support frame body, the back support frame body can rotate towards the back support frame body, and can rotate the back support frame body, and can rotate the back support frame.
The gravity-optimized anti-stumbling noon break chair provided by the utility model preferably further comprises a telescopic rod and a supporting plate component for supporting legs, wherein the telescopic rod is provided with a fixing part and a telescopic part, the fixing part is fixed on the supporting frame body, the telescopic part is telescopically fixed on the fixing part, the telescopic direction of the telescopic part is parallel to the extending direction of the first cross rod, and the supporting plate component is fixed on the telescopic part.
The gravity-optimized anti-stumbling noon break chair provided by the utility model is characterized in that the first support rod comprises a first fixed pipe and a first movable rod, the first fixed pipe is fixed on the first cross rod, the first movable rod can be slidably fixed in the first fixed pipe, the extending direction of the first movable rod is consistent with the pipe axis direction of the first fixed pipe, the first movable rod is fixed on the support frame body, the second support rod comprises a second fixed pipe and a second movable rod, the second fixed pipe is fixed on the second cross rod, the second movable rod can be slidably fixed in the second fixed pipe, the extending direction of the second movable rod is consistent with the pipe axis direction of the second fixed pipe, and the upper part of the second movable rod is fixed on the support frame body.
The gravity-optimized anti-stumbling noon break chair provided by the utility model is characterized in that the support preferably further comprises a synchronizing rod, the synchronizing rod extends horizontally, two ends of the synchronizing rod are respectively connected with the first movable rod and the second movable rod, and the extending direction of the synchronizing rod is perpendicular to the extending direction of the first cross rod.
The gravity-optimized anti-stumbling noon break chair provided by the utility model is characterized in that the support preferably further comprises a limit stabilizer bar, the limit stabilizer bar extends horizontally, two ends of the limit stabilizer bar are respectively connected with the first cross bar and the second cross bar, and the extending direction of the limit stabilizer bar is perpendicular to the extending direction of the first cross bar.
The utility model provides a gravity-optimized anti-stumbling noon break chair, which relates to the field of desks and chairs and comprises a bracket, a base and a backrest; the bracket comprises a first cross rod, a second cross rod, a first supporting rod, a second supporting rod and a supporting frame body; the first cross rod and the second cross rod extend in the horizontal direction; the extending directions of the first cross rod and the second cross rod are parallel to each other, the two ends of the first cross rod and the second cross rod are aligned in the horizontal direction perpendicular to the first cross rod, the first support rod is inclined relative to the horizontal plane, the upper end of the first support rod is inclined forward at an angle of 75 degrees, the lower end of the first support rod is fixed on the first cross rod, the lower end of the first support rod is fixed at 1/4 of the back of the first cross rod, the upper end of the first support rod is fixed on the lower side of the support frame, the second support rod is inclined relative to the horizontal plane, the upper end of the second support rod is inclined forward at an angle of 75 degrees, the lower end of the second support rod is fixed at 1/4 of the back of the second cross rod, the upper end of the second support rod is fixed on the lower side of the support frame, the base is fixed on the upper side of the support frame, the base is provided with a back for supporting the back of the human body, the back can be rotated relative to the back of the seat, and the back of the seat can be rotated relative to the back of the seat. The gravity-optimized anti-stumbling noon break seat solves the problem that students are easy to stumbling and injuring by overlong horizontal support cross bars in the prior art, and can reduce the stumbling risk of the students by the noon break seat.
Detailed Description
The following description of the technical solutions according to the embodiments of the present utility model refers to the accompanying drawings, which are included to illustrate only some embodiments of the utility model, and not all embodiments. Accordingly, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present utility model.
Embodiment 1 the gravity center optimized anti-stumbling noon break chair provided by the embodiment 1 of the utility model comprises a bracket 1, a base 2 and a backrest 3 as shown in fig. 4 to 7; the bracket 1 comprises a first cross bar 11, a second cross bar 12, a first supporting bar 13, a second supporting bar 14 and a supporting frame 15; the first cross bar 11 and the second cross bar 12 extend in the horizontal direction; the extending directions of the first cross bar 11 and the second cross bar 12 are parallel to each other, the front end and the rear end of the first cross bar 11 and the second cross bar 12 are respectively aligned in the horizontal direction perpendicular to the first cross bar 11, the first support bar 13 is inclined at an angle of 75 degrees relative to the horizontal plane, the upper end of the first support bar 13 is inclined forward, the lower end of the first support bar 13 is fixed on the first cross bar 11, the lower end of the first support bar 13 is fixed at 1/4 of the rear side of the first cross bar 11, the upper end of the first support bar 13 is fixed at the lower side of the support frame 15, the second support bar 14 is inclined at an angle of 75 degrees relative to the horizontal plane, the upper end of the second support bar 14 is fixed on the second cross bar 12, the lower end of the second support bar 14 is fixed at 1/4 of the rear side of the second cross bar 12, the upper end of the second support bar 14 is fixed at the lower side of the support frame 15, the base 2 is fixed at the upper side of the support frame 15, the base 2 has a seat surface 21 for carrying a human body, the backrest 3 is rotatably fixed at the support frame 15, the backrest 3 has a back surface for supporting the backrest 3, the backrest 31 can be rotated relative to the support surface 31 in a normal direction relative to the back surface of the backrest 3.
The gravity center optimized anti-stumbling noon break seat of the embodiment 1 of the utility model is suitable for two scenes of daily learning and noon break. In daily learning scenes, the backrest surface 31 of the backrest 3 is kept in a vertical state, and in noon break time period scenes, the backrest 3 rotates and is fixed relative to the support 1, the backrest surface 31 is inclined backwards, an obtuse angle which accords with human engineering is formed between the backrest surface 31 and the support 1, comfortable support is provided for the back of a student, and noon break in a lying position is facilitated.
Compared with the prior art, the supporting rod in the prior art extends vertically and is positioned at the center of the horizontal cross rod below, and when the noon rest chair is switched to a lying position and used by students, the gravity center formed by the students and the noon rest chair is positioned behind the supporting rod, so that the chair is easy to topple backwards; the improvement of the embodiment is that, on one hand, a first supporting rod 13 is fixed at a position 1/4 of the back of a first cross rod 11 and a second supporting rod 14 is fixed at a position 1/4 of the back of a second cross rod 12, so that when a student lies on a noon break chair, the gravity centers of the student and a main seat part (excluding the first cross rod and the second cross rod) are positioned near the connection point of the first cross rod 11 and the first supporting rod 13 and the upper part of the connection point of the second cross rod 12 and the second supporting rod 14, and on the other hand, the first supporting rod 13 and the second supporting rod 14 are obliquely arranged, and in the daily learning scene, the whole body formed by a supporting frame 15, a base 2, a backrest 3 and the student is positioned near the midpoint of the first cross rod 11 and the midpoint of the second cross rod 12, and then the position of the connection point between the first supporting rod 13 and the second supporting frame 14 is moved, and the position of the first supporting rod 14 is adjusted before the first supporting frame 13 and the second supporting frame 15 is adjusted by reducing the horizontal distance between the gravity centers and the supporting points of the first cross rod 11 and the second cross rod 14 when the student is used, ensure that the noon break seat can keep stable and balanced under two use occasions.
Firstly, because the first support bar 13 and the second support bar 14 are fixed at the 1/4 position of the back of the first cross bar 11 and the second cross bar 12, when the student lies down, the gravity center of the student and the main body part of the seat (without the first cross bar and the second cross bar) is located near the upper part of the connection part of the first cross bar 11 and the first support bar 13 and the connection part of the second cross bar 12 and the second support bar 14, at the moment, the horizontal distance between the gravity center and the support point (i.e. the contact area of the first cross bar and the second cross bar with the ground) is smaller, and according to the lever principle, the moment generated by the smaller moment arm under the same gravity effect to enable the seat to fall is smaller, so that in this case, the seat can maintain balance by only relying on the length of the first cross bar 11 and the second cross bar 12, and the stabilizing moment arm is not required to be prolonged to ensure stability, namely, in this embodiment, by reducing the moment arm applying pressure, so that small stabilizing moment arm (stabilizing in this embodiment, the connection point between the first support bar 13 and the first cross bar 11 and the length of the first cross bar 11) can be used, and the stabilizing moment arm is ensured by the stabilizing moment arm by the prior art). In addition, in the embodiment, the first support rod 13 and the second support rod 14 are inclined forward by 75 degrees, the inclination design changes the force transmission mode that the gravity of a human body is transmitted to the inclined support rod through the seat in a lying state, the gravity can be decomposed into component forces along the direction of the support rod and the direction vertical to the support rod, the component forces along the direction of the support rod enable the support rod to bear pressure, the component forces vertical to the direction of the support rod enable the support rod to incline sideways, but the support rod inclines, the ground can generate a reverse support force on the support rod, the support force can also be decomposed into a horizontal (forward) component force and a vertical (upward) component force, the component forces in the horizontal direction can balance the force for enabling the support rod to incline backwards due to the decomposition of the gravity of the back, the stability of the seat in the front and back horizontal directions is enhanced, and the structure has good anti-inclination capability, and the instability factors caused by the change of the posture of the human body can be effectively resisted even if the first cross rod 11 and the second cross rod 12 are not prolonged. Thus, the first and second rails 11, 12 of the present embodiment are shorter in length than the horizontal support rails of a conventional noon break chair, reducing the risk of a student stumbling over.
The gravity-optimized anti-stumbling noon break seat provided by the embodiment 1 of the utility model solves the problem that students are easy to stumbling and injure by overlong horizontal support cross bars in the prior art, and can reduce the stumbling risk of the students by the noon break seat.
In a preferred embodiment, the support plate assembly 5 for supporting the leg is further provided with a telescopic rod 4, the telescopic rod 4 is provided with a fixing part 41 and a telescopic part 42, the fixing part 41 is fixed on the supporting frame 15, the telescopic part 42 is telescopically fixed on the fixing part 41, the telescopic direction of the telescopic part 42 is parallel to the extending direction of the first transverse rod 11, and the support plate assembly 5 is fixed on the telescopic part 42. The manner in which the pallet assembly 5 is secured to the telescoping portion 42 is known in the art and will not be described in detail herein. The telescopic rod 4 and the supporting plate component 5 for supporting legs are used for providing a platform for supporting feet for students, in a daily study scene, the telescopic part 42 is retracted compared with the fixed part 41, the telescopic part 42 is positioned vertically below the supporting frame 15, the supporting plate component 5 moves below the supporting frame 15 along with the telescopic part 42, namely below the base 2, so that the influence on the sitting posture of the students is avoided, in a noon break scene, the telescopic part 42 extends compared with the fixed part 41, the telescopic part 42 moves to the front of the supporting frame 15, the supporting plate component 5 moves to the front of the supporting frame 15 along with the telescopic part 42, and the students can place the feet on the supporting plate component 5 to form a lying posture.
In order to meet the demands of students with different heights, in the embodiment, the first supporting rod 13 comprises a first fixed pipe 131 and a first movable rod 132, the first fixed pipe 131 is fixed on the first transverse rod 11, the first movable rod 132 can be slidably fixed in the first fixed pipe 131, the extending direction of the first movable rod 132 is consistent with the pipe axis direction of the first fixed pipe 131, the first movable rod 132 is fixed on the supporting frame body 15, the second supporting rod 14 comprises a second fixed pipe 141 and a second movable rod 142, the second fixed pipe 141 is fixed on the second transverse rod 12, the second movable rod 142 can be slidably fixed in the second fixed pipe 141, the extending direction of the second movable rod 142 is consistent with the pipe axis direction of the second fixed pipe 141, and the upper part of the second movable rod 142 is fixed on the supporting frame body 15. The sliding of the first movable rod 132 relative to the first fixed tube 131 can change the length between the upper end of the first movable rod 132 and the lower end of the first fixed rod 131, so as to adjust the length of the first support rod 13 (the specific connection mode and the position adjustment mode of the first movable rod 132 and the first fixed rod 131 are not repeated in the prior art), the changing of the length of the first support rod 13 changes the distance between the upper end and the lower end of the first support rod 13, so as to adjust the distance between the support frame 15 and the first cross rod 11, thereby realizing the height adjustment of the support frame 15, and thus realizing the height adjustment of the base 2, and when the first movable rod 132 slides relative to the first fixed tube 131, the sliding of the second movable rod 142 relative to the second fixed tube 141 needs to be synchronously controlled, so as to ensure the posture balance of the base 2 where the support frame 15 is already fixed on the support frame 15.
As a preferred solution, in this embodiment, the bracket 1 further includes a synchronizing rod 16, where the synchronizing rod 16 extends in a horizontal direction, two ends of the synchronizing rod 16 are respectively connected to the first movable rod 132 and the second movable rod 142, and an extending direction of the synchronizing rod 16 is perpendicular to an extending direction of the first cross rod 11. The synchronizing bar 16 can facilitate the length adjustment balance of the first support bar 13 and the second support bar 14.
In this embodiment, the bracket 1 further includes a limit stabilizer bar 17, the limit stabilizer bar 17 extends in a horizontal direction, two ends of the limit stabilizer bar 17 are respectively connected to the first cross bar 11 and the second cross bar 12, and an extending direction of the limit stabilizer bar 17 is perpendicular to an extending direction of the first cross bar 11. The limit stabilizer bar 17 can ensure the stable position between the first cross bar 11 and the second cross bar 12.
In summary, the utility model provides a gravity-optimized anti-stumbling noon break chair, which relates to the field of desks and chairs and comprises a bracket, a base and a backrest; the bracket comprises a first cross rod, a second cross rod, a first supporting rod, a second supporting rod and a supporting frame body; the first cross rod and the second cross rod extend in the horizontal direction; the extending directions of the first cross rod and the second cross rod are parallel to each other, the two ends of the first cross rod and the second cross rod are aligned in the horizontal direction perpendicular to the first cross rod, the first support rod is inclined relative to the horizontal plane, the upper end of the first support rod is inclined forward at an angle of 75 degrees, the lower end of the first support rod is fixed on the first cross rod, the lower end of the first support rod is fixed at 1/4 of the back of the first cross rod, the upper end of the first support rod is fixed on the lower side of the support frame, the second support rod is inclined relative to the horizontal plane, the upper end of the second support rod is inclined forward at an angle of 75 degrees, the lower end of the second support rod is fixed at 1/4 of the back of the second cross rod, the upper end of the second support rod is fixed on the lower side of the support frame, the base is fixed on the upper side of the support frame, the base is provided with a back for supporting the back of the human body, the back can be rotated relative to the back of the seat, and the back of the seat can be rotated relative to the back of the seat. The gravity-optimized anti-stumbling noon break seat solves the problem that students are easy to stumbling and injuring by overlong horizontal support cross bars in the prior art, and can reduce the stumbling risk of the students by the noon break seat.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.