Dumbbell stool capable of randomly adjusting angle of backrest

Abstract

The dumbbell stool comprises a seat cushion, a seat cushion frame, a backrest, a backrest frame, a supporting frame, a main frame and a backrest adjusting device, the seat cushion and the seat cushion frame are fixed and arranged on the main frame in a sliding mode, the backrest and the backrest frame are fixed and hinged to the seat cushion frame, the supporting frame is correspondingly 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 which are arranged on the main frame, the nut seat is fixed to the bottom of the cushion frame, and when the manual driving mechanism drives the lead screw to rotate, the lead screw drives the cushion frame to move front and back through the nut seat; the backrest frame moves back and forth and rotates under the combined action of the cushion frame and the supporting frame, so that the angle between the cushion and the backrest is adjusted. 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 invention relates to the technical field of fitness equipment, in particular to a multifunctional dumbbell bench with a backrest angle that can be adjusted arbitrarily. Background Art

[0002] The dumbbell bench is a multifunctional indoor fitness equipment, which is used to assist in various fitness training processes. It can be used to assist dumbbells to complete some necessary fitness movements, such as incline dumbbell bench press, decline dumbbell bench press, sit-ups, leg pull-up, leg pull-back, upper arm exercise, prone exercise, upper arm stretching and other fitness exercises, and is widely used. For example, Chinese patent authorization announcement number CN219460707U discloses a fitness bench, including a main body, a back pad, a seat cushion, a slider and a first support member, the slider can be slidably arranged on the main body, one end of the back pad is rotatably connected to the slider, the seat cushion 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 realize linkage. 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 a suitable position on the main body without operating the first support member, which greatly facilitates the user's operation and makes the fitness bench more convenient to use. However, there are the following problems during use: First, the slider is locked with the positioning hole through the positioning component during adjustment, and the number of positioning holes is limited, so it is impossible to adjust the angle between the seat cushion and the backrest at will. Second, because the slider is located below the seat cushion and the backrest, when adjusting the angle between the seat cushion and the backrest, the slider movement adjustment is not only heavy, but also extremely inconvenient, and it is difficult to accurately insert the positioning component into the positioning hole. In response to the above problems, many manufacturers and knowledgeable people have developed and researched, but there is no ideal solution so far. Summary of the invention

[0003] In order to overcome the above problems existing in the prior art, the purpose of the 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 present invention creates a technical solution adopted to solve the above-mentioned technical problems, 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 is fixed on the seat cushion frame, guide rails are symmetrically provided on both sides of the main frame, and sliding sleeves are symmetrically provided on the seat cushion frame. The sliding sleeves are slidably set on the guide rails. The backrest is fixed to the backrest frame and hinged on 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 matched with the screw rod thread, and a manual driving mechanism. The nut seat is fixed at the bottom of the seat cushion frame. When the manual driving mechanism drives the screw rod to rotate, the screw rod drives the seat 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 seat cushion frame and the support frame to achieve angle adjustment between the seat cushion and the backrest.

[0005] A further solution created by the present invention is that the manual drive mechanism includes a transmission case consisting of an upper case and a lower case, a helical gear and a helical gear shaft installed in the transmission case, a hand crank seat, and a hand crank handle. The transmission case is fixed on a fixed seat of the main frame, the core shaft of the hand crank seat is rotatably installed on the transmission case and connected to the helical gear shaft, the helical gear is fixed on the screw rod and meshes with the helical gear shaft, and 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.

[0006] The present invention provides a further solution, wherein the manual drive mechanism is further provided with a rotation locking mechanism, wherein the rotation locking mechanism comprises a clutch seat, a clutch spring and a clutch gear sleeved on the core shaft of the hand crank seat, the clutch seat is provided with a clutch toothed disk and fixed to the transmission case, the clutch gear is provided with a push rod, the push rod is slidably arranged on the guide groove of the hand crank seat, the hand crank seat is provided with a hand crank folding groove matching the hand crank handle, the guide groove is connected with the hand crank folding groove, a positioning recess is provided on the side wall of the hand crank folding groove, and the hand crank handle is provided with a locking protrusion tightly matched with the positioning recess; when the hand crank handle is locked in the hand crank folding groove through the locking protrusion and the positioning recess, the hand crank handle overcomes the elastic force of the clutch spring and lifts up the push rod, the clutch gear engages and locks with the clutch toothed disk, and the screw rod is locked and cannot rotate; when the hand crank handle is separated from the hand crank handle folding groove, the clutch gear is separated from the clutch toothed disk on the clutch seat under the elastic force of the clutch spring to solve the locking, and the screw rod can rotate under the action of external force.

[0007] According to a further solution of the present invention, an auxiliary support frame is hinged on 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 plate is installed on the transmission housing.

[0009] A further solution created by the present invention is that the main frame is correspondingly fixed with front and rear connecting seats, the front and rear supporting feet are correspondingly hinged on the front and rear connecting seats, and the front and rear connecting seats are correspondingly provided with a plurality of front and rear positioning holes, and the front and rear supporting feet are locked on the corresponding front and rear connecting seats by front and rear positioning pins cooperating with the corresponding front and rear positioning holes.

[0010] After adopting the above structure, compared with the prior art, there are the following advantages and effects: First, because the seat cushion frame is slidably arranged on the main frame and is hinged with the backrest frame, when the manual drive mechanism drives the screw rod to rotate, the screw rod drives the seat cushion frame to move forward and backward through the nut seat, and 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 arbitrarily. Second, because the bevel gear shaft is fixed on the core shaft of the hand crank seat, the bevel gear is fixed on the screw rod and meshes with the bevel gear shaft. When the hand crank drives the hand crank seat to rotate, the hand crank seat drives the screw rod to rotate through the meshing of the bevel gear shaft and the bevel gear. The angle between the seat cushion and the backrest can be adjusted by rotating the hand crank, and the backrest angle adjustment is simple, labor-saving and light. Third, in order to prevent the angle between the seat cushion and the backrest from changing during exercise, the manual drive mechanism is also provided with a rotation locking mechanism. During exercise, the hand crank is locked on the hand crank folding groove through the locking protrusion and the positioning concave hole. After the hand crank overcomes the elastic force of the clutch spring, it pushes up the push rod, the clutch gear engages with the clutch toothed disc and locks, and the screw rod is locked and cannot rotate, thereby ensuring that the angle between the seat cushion and the backrest remains unchanged, ensuring the stability and reliability of exercise and fitness; when adjusting the angle between the seat cushion and the backrest, the hand crank is separated from the hand crank folding groove, and the clutch gear is separated from the clutch toothed disc on the clutch seat under the elastic force of the clutch spring to solve the locking. When the hand crank drives the hand crank seat to rotate, the hand crank seat engages with the bevel gear shaft and the bevel gear to drive the screw rod to rotate, so as to achieve the angle adjustment between the seat cushion and the backrest. Fourth, an auxiliary support frame is hinged on the support frame, and an auxiliary support seat that cooperates with the auxiliary support frame is provided on the backrest frame, which can solve the problem that the support frame cannot withstand a large bearing force when the backrest support angle is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The present invention provides a schematic diagram of the exploded structure when the backrest is laid flat.

[0012] Figure 2 The present invention provides a three-dimensional structural schematic diagram when the backrest is laid flat.

[0013] Figure 3 The figure is a schematic diagram of the matching structure when the backrest of the present invention is laid flat.

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

[0015] Figure 5 The present invention provides a schematic diagram of the matching structure when the backrest support angle is large.

[0016] Figure 6 The invention provides a front view of the backrest adjustment device when it is in an adjustable state.

[0017] Figure 7 Created for this invention Figure 6 Schematic diagram of the AA cross-section structure.

[0018] Figure 8 The present invention provides a front view of the backrest adjustment device when it is in a locked state.

[0019] Fig. 9 Created for this invention 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 plate, 9 an upper box body, 10 a bevel gear, 11 a bevel gear shaft, 12 a lower box body, 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 9 As shown, the present invention creates a specific implementation scheme of a dumbbell bench with an adjustable backrest angle, which includes a cushion 1, a 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 cushion 1 is fixed on the cushion frame 2, and guide rails 20 are symmetrically arranged on both sides of the main frame 19. The cushion frame 2 is symmetrically provided with sliding sleeves, which are slidably arranged on the guide rails 20. The backrest 3 and the backrest frame 4 are fixed and hinged on the 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 driving mechanism. The nut seat 7 is fixed to the bottom of the cushion frame 2. When the manual driving mechanism drives the screw rod 6 to rotate, the screw rod 6 drives the cushion frame 2 to move forward and backward through the nut seat 7. The backrest frame 4 moves forward and backward and rotates under the joint action of the cushion frame 2 and the support frame 5 to achieve angle adjustment between the seat cushion 1 and the backrest 3.

[0022] In order to realize manual drive, 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 a fixed seat 29 of a main frame 19. The core shaft of the hand crank seat 16 is rotatably mounted 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. 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 and drives the screw rod 6 to rotate.

[0023] 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 housing. The clutch gear 15 is provided with a push rod 31, and the push rod 31 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 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 meet the requirements of different exercises.

[0024] In order to solve the problem that the support frame 5 cannot withstand a large bearing force when the supporting 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 on the support frame 5.

[0025] In order to increase the aesthetics and ensure that the 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 feet 24, 27, the front and rear connecting seats 22, 26 are correspondingly fixed on the main frame 19, and the front and rear supporting feet 24, 27 are correspondingly hinged on the front and rear connecting seats 22, 26. The front and rear connecting seats 22, 26 are correspondingly provided with a plurality of front and rear positioning holes 23, 25, and the front and rear supporting feet 24, 27 are locked on the corresponding front and rear connecting seats 22, 26 through the front and rear positioning pins 21, 28 and the corresponding front and rear positioning holes 23, 25.

[0027] The above 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 are all within the protection scope of the present invention.

Claims

1. A dumbbell bench with an adjustable backrest angle, comprising a cushion (1), a 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) is fixed on the seat cushion frame (2), guide rails (20) are symmetrically arranged on both sides of the main frame (19), and sliding sleeves are symmetrically arranged on the seat cushion frame (2), and the sliding sleeves are slidably arranged on the guide rails (20), 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), and the backrest adjustment device (30) includes a rotatable arrangement on the main frame (19 ), a screw rod (6) on the screw rod (6), a nut seat (7) threadedly matched with the screw rod (6), and a manual driving mechanism, wherein the nut seat (7) is fixed at the bottom of the seat cushion frame (2), and when the manual driving mechanism drives the screw rod (6) to rotate, 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 comprises a transmission housing composed of an upper housing (9) and a lower housing (12), a helical gear (10) and a helical gear shaft (11) installed in the transmission housing, a hand crank seat (16), and a hand crank handle (17). The transmission housing is fixed on a fixed seat (29) of a main frame (19). The mandrel of the hand crank seat (16) is rotatably mounted on the transmission housing and connected to the helical gear shaft (11). The helical gear (10) is fixed on the screw rod (6) and meshes with the helical gear shaft (11). 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.

3. The dumbbell bench with adjustable backrest angle according to claim 2 is characterized in that: The manual drive mechanism is also 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 arranged on a guide groove (32) of the hand crank seat (16); the hand crank seat (16) is provided with a hand crank folding groove (34) matched 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 crank handle (17) is provided with a locking protrusion (18) which is tightly matched with the positioning recess (33); when the crank handle (17) is locked in the crank handle folding groove (34) through the locking protrusion (18) and the positioning recess (33), the crank handle (17) overcomes the elastic force of the clutch spring (14) and pushes up the push rod (31), the clutch gear (15) is meshed and locked with the clutch toothed disc, and the screw rod (6) is locked and cannot rotate; when the crank handle (17) is separated from the crank handle folding groove (34), the clutch gear (15) is separated from the clutch toothed disc on the clutch seat (13) under the elastic force of the clutch spring (14) to solve the locking, and the screw rod (6) can rotate under the action of external force.

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

5. The dumbbell bench with an 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: The main frame (19) is correspondingly fixed with front and rear connecting seats (22, 26), and the front and rear connecting seats (22, 26) are correspondingly hinged with front and rear supporting feet (24, 27), and the front and rear connecting seats (22, 26) are correspondingly provided with a plurality of front and rear positioning holes (23, 25), and the front and rear supporting feet (24, 27) are locked on the corresponding front and rear connecting seats (22, 26) through the front and rear positioning pins (21, 28) and the corresponding front and rear positioning holes (23, 25).

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