Dumbbell stool capable of randomly adjusting angle of backrest

Abstract

The dumbbell stool comprises a cushion, a cushion frame, a backrest, a backrest frame, a supporting frame, a main frame and a backrest adjusting device, the cushion and the cushion frame are fixed and arranged on the main frame, the backrest and the backrest frame are fixed and hinged to the cushion frame, the supporting frame is hinged between the backrest frame and the main frame, and the backrest adjusting device is arranged on the main frame. The backrest adjusting device comprises a lead screw, a nut seat and a manual driving mechanism, the nut seat is fixed on the seat cushion frame, the manual driving mechanism comprises a transmission box body, a bevel gear, a bevel gear shaft, a hand-cranking seat and a hand-cranking handle, when the hand-cranking handle drives the hand-cranking seat, the hand-cranking seat is meshed with the bevel gear through the bevel gear shaft to drive the lead screw to rotate, the lead screw drives the seat cushion frame to move front and back, and the seat cushion frame moves back and forth. And the backrest frame realizes angle adjustment between the cushion and the backrest under the combined action of the cushion frame and the support frame. After the structure is adopted, the chair has the advantages of reasonable structural design, randomly adjustable backrest angle, simplicity and convenience in adjustment, good stability and reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fitness equipment, in particular to a multifunctional dumbbell bench with an adjustable backrest angle. Background Art

[0002] The dumbbell bench is a multifunctional indoor fitness equipment used to assist in various fitness exercises. It can be used to assist dumbbells in completing some necessary fitness exercises, such as incline dumbbell bench press, decline dumbbell bench press, sit-ups, leg raises, leg raises, upper arm exercises, prone exercises, upper arm stretches, and other fitness exercises. It has a very wide range of applications. For example, Chinese patent authorization announcement number CN219460707U discloses a fitness bench, which includes a main body, a back pad, a seat pad, a slider, and a first support member. The slider is slidably arranged on the main body, one end of the back pad is rotatably connected to the slider, the seat pad is connected to the slider, one end of the first support member is rotatably connected to the back pad, and the other end of the first support member is rotatably connected to the main body. The slider and the first support member can be linked together. When the user slides the slider, the back pad can be automatically raised and lowered under the drive of the first support member. The user only needs to adjust the slider to the appropriate position on the main body without having to operate the first support member, which greatly facilitates user operation and makes the fitness bench more convenient to use. However, the following problems exist during use: First, the slider locks into the positioning holes during adjustment via a positioning assembly. The limited number of positioning holes prevents the angle between the seat cushion and backrest from being adjusted precisely. Second, because the slider is located below the seat cushion and backrest, adjusting the angle between the two is not only awkward and cumbersome, but also difficult to accurately insert the positioning assembly into the positioning holes. Numerous manufacturers and individuals have conducted research and development to address these issues, but a satisfactory solution has yet to be found. Summary of the Invention

[0003] In order to overcome the above problems existing in the prior art, the purpose of the present invention is to provide a dumbbell bench with an adjustable backrest angle, which has a reasonable structural design, an adjustable backrest angle, simple and easy adjustment, and good stability and reliability.

[0004] The utility model solves the above-mentioned technical problems by adopting the technical solution, which includes a seat cushion, a seat cushion frame, a backrest, a backrest frame, a support frame, a main frame, and a backrest adjustment device. The seat cushion and the seat cushion frame are fixedly and slidably arranged on the main frame, the backrest and the backrest frame are fixedly and hingedly connected to the seat cushion frame, and the two ends of the support frame are correspondingly hinged between the backrest frame and the main frame. The backrest adjustment device includes a screw rod rotatably arranged on the main frame, a nut seat that cooperates with the screw rod thread, and a manual drive mechanism. The nut seat is fixed to the bottom of the seat cushion frame. The manual drive mechanism includes a transmission composed of an upper box body and a lower box body. The box body, the helical gear and helical gear shaft installed in the transmission box body, the hand crank seat, and the hand crank handle. The transmission box body is fixed on the fixed seat of the main frame. The core shaft of the hand crank seat is rotatably installed on the transmission box body and is connected to the helical gear shaft. The helical gear is fixed on the screw rod and meshes with the helical gear shaft. The hand crank handle is connected to the hand crank seat. When the hand crank handle drives the hand crank seat, the hand crank seat drives the screw rod to rotate through the meshing of the helical gear shaft and the helical gear. The screw rod drives the cushion frame to move forward and backward through the nut seat. The backrest frame moves forward and backward and rotates under the joint action of the cushion frame and the support frame to realize the angle adjustment between the seat cushion and the backrest.

[0005] The cam is secured to the handrail and is unlocked when the gear train is unlocked, and the cam is secured to the handrail by a spring that pushes the gear train forward and engages with the clutch gear to release the gear train.

[0006] According to a further solution of the present invention, guide rails are symmetrically provided on both sides of the main frame, and sliding sleeves are symmetrically provided on the cushion frame, and the sliding sleeves are slidably arranged on the guide rails.

[0007] According to a further solution of the present invention, an auxiliary support frame is hingedly connected to the support frame, and an auxiliary support seat cooperating with the auxiliary support frame is provided on the backrest frame.

[0008] According to a further solution of the present invention, a decorative cover is installed on the transmission box.

[0009] According to a further solution of the present invention, the main frame is fixed with front and rear connecting seats, the front and rear supporting legs are hinged on the front and rear connecting seats, and the front and rear connecting seats are provided with a plurality of front and rear positioning holes. The front and rear supporting legs are locked on the corresponding front and rear connecting seats through front and rear positioning pins and the corresponding front and rear positioning holes.

[0010] The above structure has the following advantages and effects compared to the prior art: First, because the seat cushion frame is slidably mounted on the main frame and hingedly connected to the backrest frame, when the manual drive mechanism drives the screw to rotate, the screw drives the seat cushion frame forward and backward through the nut seat. The backrest frame moves forward and backward and rotates under the joint action of the seat cushion frame and the support frame, and the angle between the seat cushion and the backrest can be adjusted at will. Second, because the helical gear shaft is fixed to the core shaft of the hand crank seat, and the helical gear is fixed to the screw shaft and meshes with the helical gear shaft, when the hand crank handle drives the hand crank seat to rotate, the hand crank seat drives the screw shaft to rotate through the meshing of the helical gear shaft and the helical gear. The angle between the seat cushion and the backrest can be adjusted by rotating the hand crank handle, making backrest angle adjustment simple, labor-saving, and easy. Third, to prevent the angle between the seat cushion and backrest from changing during exercise, the manual drive mechanism is also equipped with a rotation locking mechanism. During exercise, the hand crank handle is locked to the hand crank handle folding groove through the locking protrusion and the positioning recess. After the hand crank handle overcomes the elastic force of the clutch spring, it pushes up the push rod, the clutch gear engages and locks with the clutch sprocket, and the screw is locked and cannot rotate, thereby ensuring that the angle between the seat cushion and backrest remains unchanged, ensuring the stability and reliability of exercise and fitness. When adjusting the angle between the seat cushion and backrest, the hand crank handle separates from the hand crank handle folding groove, and the clutch gear separates from the clutch sprocket on the clutch seat under the elastic force of the clutch spring to resolve the locking. When the hand crank handle drives the hand crank seat to rotate, the hand crank seat engages with the helical gear shaft and drives the screw to rotate, thereby achieving the angle adjustment between the seat cushion and backrest. Fourth, an auxiliary support frame is hinged to the support frame, and the backrest frame is equipped with an auxiliary support seat that cooperates with the auxiliary support frame. This can solve the problem that the support frame cannot withstand large loads when the backrest support angle is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the exploded structure of the utility model when the backrest is laid flat.

[0012] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model when the backrest is laid flat.

[0013] Figure 3 It is a schematic diagram of the matching structure of the utility model when the backrest is laid flat.

[0014] Figure 4 This is a schematic diagram of the matching structure of the utility model when the backrest support angle is relatively small.

[0015] Figure 5 This is a schematic diagram of the matching structure of the utility model when the backrest support angle is large.

[0016] Figure 6 This is a front view of the utility model's backrest adjustment device in an adjustable state.

[0017] Figure 7 For this utility model Figure 6 AA cross-sectional structure diagram.

[0018] Figure 8 This is a front view of the backrest adjustment device of the utility model in the locked state.

[0019] Figure 9 For this utility model Figure 8 Schematic diagram of the BB cross-section structure.

[0020] Among them, 1 is a seat cushion, 2 a seat cushion frame, 3 a backrest, 4 a backrest frame, 5 a support frame, 6 a screw rod, 7 a nut seat, 8 a decorative cover, 9 an upper box, 10 a bevel gear, 11 a bevel gear shaft, 12 a lower box, 13 a clutch seat, 14 a clutch spring, 15 a clutch gear, 16 a hand crank seat, 17 a hand crank handle, 18 a locking protrusion, 19 a main frame, 20 a guide rail, 21 a front positioning pin, 22 a front connecting seat, 23 a front positioning hole, 24 a front support leg, 25 a rear positioning hole, 26 a rear connecting seat, 27 a rear support leg, 28 a rear positioning pin, 29 a fixed seat, 30 a backrest adjustment device, 31 a push rod, 32 a guide groove, 33 a positioning recess, 34 a hand crank handle folding groove, 51 an auxiliary support frame, and 52 an auxiliary support seat. DETAILED DESCRIPTION

[0021] Figures 1 to 9As shown, this is a specific implementation scheme of a dumbbell bench with an arbitrarily adjustable backrest angle of the utility model, which includes a seat cushion 1, a seat cushion frame 2, a backrest 3, a backrest frame 4, a support frame 5, a main frame 19, and a backrest adjustment device 30. The seat cushion 1 and the seat cushion frame 2 are fixedly and slidably arranged on the main frame 19, the backrest 3 and the backrest frame 4 are fixedly and hingedly connected to the seat cushion frame 2, and the two ends of the support frame 5 are correspondingly hinged between the backrest frame 4 and the main frame 19. The backrest adjustment device 30 includes a screw rod 6 rotatably arranged on the main frame 19, a nut seat 7 threadedly matched with the screw rod 6, and a manual drive mechanism. The nut seat 7 is fixed to the bottom of the cushion frame 2. The manual drive mechanism includes a transmission box body composed of an upper box body 9 and a lower box body 12, a helical gear 10 and a helical gear shaft 11 installed in the transmission box body, a hand crank seat 16, and a hand crank handle 17. The transmission box body is fixed on the fixed seat 29 of the main frame 19. The core shaft of the hand crank seat 16 is rotatably installed on the transmission box body and passes through the helical gear shaft 11. The helical gear shaft 11 is linked with the core shaft, the helical gear 10 is fixed on the screw rod 6 and meshes with the helical gear shaft 11, and the hand crank handle 17 is connected to the hand crank seat 16; when the hand crank handle 17 drives the hand crank seat 16, the hand crank seat 16 meshes with the helical gear 10 through the helical gear shaft 11 to drive the screw rod 6 to rotate, and the screw rod 6 drives the cushion frame 2 to move forward and backward through the nut seat 7. The backrest frame 4 moves back and forth and rotates under the joint action of the cushion frame 2 and the support frame 5 to realize the angle adjustment between the seat cushion 1 and the backrest 3.

[0022] In order to realize the locking and unlocking of the screw rod, the manual drive mechanism is also provided with a rotation locking mechanism, which includes a clutch seat 13, a clutch spring 14, and a clutch gear 15 which are sleeved on the core shaft of the hand crank seat 16. The clutch seat 13 is provided with a clutch toothed disk and is fixed to the transmission box. The clutch gear 15 is provided with a push rod 31, which is slidably arranged on the guide groove 32 of the hand crank seat 16. The hand crank seat 16 is provided with a hand crank folding groove 34 which cooperates with the hand crank handle 17. The guide groove 32 is connected to the hand crank folding groove 34. A positioning recess 33 is provided on the side wall of the hand crank folding groove 34. The hand crank handle 17 is provided with a positioning recess 33 which is tightly matched with the positioning recess 33. Locking protrusion 18; when the hand crank 17 is locked in the hand crank folding groove 34 through the locking protrusion 18 and the positioning recess 33, the hand crank 17 overcomes the elastic force of the clutch spring 14 and lifts up the push rod 31, the clutch gear 15 engages and locks with the clutch sprocket, and the screw rod 6 is locked and cannot rotate, ensuring stable and reliable fitness exercise; when the hand crank 17 is separated from the hand crank folding groove 34, the clutch gear 15 is separated from the clutch sprocket on the clutch seat 13 under the elastic force of the clutch spring 14 to solve the locking problem, and the screw rod 6 can rotate under the action of external force. In this state, the angle between the seat cushion 1 and the backrest 3 can be arbitrarily adjusted by rotating the hand crank 7 to adapt to the requirements of different exercises.

[0023] In order to ensure that the seat cushion frame 2 moves smoothly and the backrest angle is easily adjusted, guide rails 20 are symmetrically provided on both sides of the main frame 19, and sliding sleeves are symmetrically provided on the seat cushion frame 2, and the sliding sleeves are slidably arranged on the guide rails 20.

[0024] In order to solve the problem that the support frame 5 cannot withstand a large bearing force when the support angle of the backrest 3 is small, an auxiliary support frame 51 is hinged on the support frame 5, and the backrest frame 4 is provided with an auxiliary support seat 52 that cooperates with the auxiliary support frame 51. In order to adapt to the adjustment of different angles, multiple adjustment slots are provided on the auxiliary support seat 52, or multiple adjustment slots are provided on the auxiliary support frame 51; when the auxiliary support frame 51 is not needed, the auxiliary support frame 51 is buckled onto the support frame 5.

[0025] In order to increase the aesthetics and ensure that sportswear will not get stuck on the equipment, a decorative cover plate 8 is installed on the transmission housing.

[0026] In order to facilitate the use and folding of the front and rear supporting legs 24 and 27, the main frame 19 is correspondingly fixed with front and rear connecting seats 22 and 26, and the front and rear supporting legs 24 and 27 are correspondingly hinged on the front and rear connecting seats 22 and 26. The front and rear connecting seats 22 and 26 are correspondingly provided with a number of front and rear positioning holes 23 and 25. The front and rear supporting legs 24 and 27 are locked on the corresponding front and rear connecting seats 22 and 26 through the front and rear positioning pins 21 and 28 and the corresponding front and rear positioning holes 23 and 25.

[0027] The above description is only a specific embodiment of the present invention and does not limit the present invention in any form. Simple modifications, equivalent changes or modifications made without departing from the technical solution of the present invention fall within the scope of protection of the present invention.

Claims

1. A dumbbell bench with an adjustable backrest angle, comprising a seat cushion (1), a seat cushion frame (2), a backrest (3), a backrest frame (4), a support frame (5), a main frame (19), and a backrest adjustment device (30), wherein: The seat cushion (1) and the seat cushion frame (2) are fixed and slidably arranged on the main frame (19), the backrest (3) and the backrest frame (4) are fixed and hinged on the seat cushion frame (2), and the two ends of the support frame (5) are correspondingly hinged between the backrest frame (4) and the main frame (19). The backrest adjustment device (30) includes a screw rod (6) rotatably arranged on the main frame (19), a nut seat (7) threadedly matched with the screw rod (6), and a manual drive mechanism. The nut seat (7) is fixed to the bottom of the seat cushion frame (2). The manual drive mechanism includes a transmission box body composed of an upper box body (9) and a lower box body (12), a helical gear (10) and a helical gear shaft (11) installed in the transmission box body, a hand crank seat (16), and a hand crank handle (17). The transmission box body is fixed on the fixed seat (29) of the main frame (19), the core shaft of the hand crank seat (16) is rotatably mounted on the transmission box body and connected to the bevel gear shaft (11), the bevel gear (10) is fixed on the screw rod (6) and meshed with the bevel gear shaft (11), and the hand crank handle (17) is connected to the hand crank seat (16); when the hand crank handle (17) drives the hand crank seat (16), the hand crank seat (16) meshes with the bevel gear shaft (11) and drives the screw rod (6) to rotate, and the screw rod (6) drives the seat cushion frame (2) to move forward and backward through the nut seat (7), and the backrest frame (4) moves forward and backward and rotates under the joint action of the seat cushion frame (2) and the support frame (5) to achieve angle adjustment between the seat cushion (1) and the backrest (3).

2. The dumbbell bench with adjustable backrest angle according to claim 1 is characterized in that: The manual drive mechanism is further provided with a rotation locking mechanism, which comprises a clutch seat (13) sleeved on the core shaft of the hand crank seat (16), a clutch spring (14), and a clutch gear (15). The clutch seat (13) is provided with a clutch toothed disc and fixed to the transmission housing. The clutch gear (15) is provided with a push rod (31). The push rod (31) is slidably provided on the guide groove (32) of the hand crank seat (16). The hand crank seat (16) is provided with a hand crank folding groove (34) that cooperates with the hand crank (17). The guide groove (32) is connected to the hand crank folding groove (34). A positioning recess (33) is provided on the side wall of the hand crank folding groove (34). The crank handle (17) is provided with a locking protrusion (18) that is tightly matched with the positioning recess (33); when the hand crank handle (17) is locked in the hand crank handle folding groove (34) through the locking protrusion (18) and the positioning recess (33), the hand crank handle (17) overcomes the elastic force of the clutch spring (14) and pushes up the push rod (31), the clutch gear (15) is engaged and locked with the clutch toothed disk, and the screw rod (6) is locked and cannot rotate; when the hand crank handle (17) is separated from the hand crank handle folding groove (34), the clutch gear (15) is separated from the clutch toothed disk on the clutch seat (13) under the elastic force of the clutch spring (14) to solve the locking problem, and the screw rod (6) can rotate under the action of external force.

3. The dumbbell bench with adjustable backrest angle according to claim 1 is characterized in that: Guide rails (20) are symmetrically provided on both sides of the main frame (19), and sliding sleeves are symmetrically provided on the cushion frame (2), and the sliding sleeves are slidably arranged on the guide rails (20).

4. The dumbbell bench with adjustable backrest angle according to claim 1 is characterized in that: An auxiliary support frame (51) is hinged on the support frame (5), and an auxiliary support seat (52) matched with the auxiliary support frame (51) is provided on the backrest frame (4).

5. The dumbbell bench with adjustable backrest angle according to claim 1 is characterized in that: A decorative cover plate (8) is installed on the transmission box body.

6. The dumbbell bench with an adjustable backrest angle according to any one of claims 1 to 5, characterized in that: Front and rear connecting seats (22, 26) are fixed to the main frame (19) respectively, and front and rear supporting legs (24, 27) are hinged to the front and rear connecting seats (22, 26) respectively. A plurality of front and rear positioning holes (23, 25) are provided on the front and rear connecting seats (22, 26) respectively, and the front and rear supporting legs (24, 27) are locked to the corresponding front and rear connecting seats (22, 26) by matching the corresponding front and rear positioning holes (23, 25) with the front and rear positioning pins (21, 28).

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