Sit-up chest expander for health promotion

Abstract

The utility model relates to the technical field and discloses a health promotion sit-up chest expander which comprises a U-shaped seat, a mounting block is mounted at an opening in the front end of the U-shaped seat, a sliding groove is formed in the surface of the top of the mounting block, pedals penetrate through the sliding groove and are mounted on the two sides of the top of the mounting block, and a rotating disc is arranged at the front end of the mounting block. A locking knob penetrates through the surface of the rotary disc, and the rotary disc extends into the mounting block and is provided with an adjusting mechanism. According to the utility model, the adjusting mechanism is arranged to drive the worm to rotate when the turntable is rotated, the worm drives the bidirectional screw rod to rotate through transmission with the worm gear, and the bidirectional screw rod drives the ball sliding block to move on the surface of the ball sliding block in an opposite state through screw transmission, so that the direction of the pedal at the top of the mounting block is adjusted to adapt to the use habits of different users; and by arranging the extension assembly, the device is suitable for users with different length requirements, the exercise effect is met, and the position of the mounting block on the U-shaped seat can be adjusted according to the site requirement.

Description

Technical Field

[0001] This utility model relates to the field of exercise equipment technology, and in particular to a sit-up resistance band for health promotion. Background Technology

[0002] Sit-ups are a form of exercise designed to strengthen abdominal muscles. The correct posture for sit-ups is to stand with your legs together and arms raised. Using your abdominal muscles, swing your arms forward to quickly sit up, then continue bending forward until your hands touch your feet and your head is down. Then return to the sitting position and repeat continuously. Resistance bands can be used as home sit-up aids. They typically use elastic ropes or belts with handles. By pulling the resistance band and stepping on the pedals, users can more quickly exercise their abdominal muscles.

[0003] A search of Chinese literature with publication number CN219398861U reveals a sit-up resistance device for health promotion, comprising a movable base, a movable handle fixedly attached to the top surface of the movable base, a plurality of hand grip grooves evenly distributed on the movable handle, a first mounting groove on the bottom surface of the movable base, a replaceable resistance rope end engaged in the first mounting groove, and the other end of the replaceable resistance rope engaged in a second mounting groove on the top surface of the mounting base. The inner walls of the first and second mounting grooves are respectively threaded and respectively engaged with the two ends of the replaceable resistance rope. Symmetrical connecting grooves are provided on both sides of the mounting base, and second rotating bearings are fixedly attached to the connecting grooves. Rotating blocks are fixedly attached to the second rotating bearings, and one end of each rotating block is fixedly attached to one side of a footplate. This invention allows for the removal of replaceable resistance ropes from the device to replace elastic resistance ropes that have lost their elasticity, facilitating continued use of the device. However, the foot pedals lack adjustment functionality, failing to meet the needs of different users and affecting comfort. Furthermore, the device lacks length adjustment for the resistance band, failing to meet the needs of users of different heights and thus hindering the desired exercise effect. To address these issues, this invention provides a sit-up resistance band for health promotion. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a sit-up resistance band for health promotion, which aims to improve the existing technology by addressing the lack of foot pedal orientation adjustment and the lack of length adjustment in the resistance band.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sit-up resistance band for health promotion, comprising a U-shaped base, an installation block installed at the front opening of the U-shaped base, a groove formed on the top surface of the installation block, foot pedals installed through the groove on both sides of the top of the installation block, a turntable provided at the front end of the installation block, a locking knob provided through the surface of the turntable, and an adjustment mechanism provided inside the installation block extending from the turntable.

[0006] The adjustment mechanism includes a worm and a worm wheel, which are connected by a transmission. A bidirectional lead screw is fixedly sleeved inside the worm wheel. Two ball bearing sliders are sleeved on both sides of the surface of the bidirectional lead screw. A positioning plate is fixedly connected to the bottom end of the ball bearing sliders, and the top of the ball bearing sliders is fixedly connected to a foot pedal.

[0007] As a further description of the above technical solution:

[0008] The top two sides of the U-shaped seat are equipped with upright plates, and rods are installed between the upright plates. A movable block is movably sleeved on the middle section of the outer surface of the rod.

[0009] As a further description of the above technical solution:

[0010] The top two sides of the movable block are provided with extension components. The extension components include a sleeve, and a telescopic rod is sleeved inside the sleeve. Several positioning holes are opened on the outer surface of the sleeve. A spring button is provided through the surface of one of the positioning holes, and the spring button is threaded through the positioning hole and connected to the telescopic rod.

[0011] As a further description of the above technical solution:

[0012] A tensioner is fixedly installed at the top of the telescopic rod, and the tensioner is composed of an elastic rod and a handle.

[0013] As a further description of the above technical solution:

[0014] The U-shaped frame has grooves on both sides, and an insert block is provided through the surface of the groove. The insert block passes through the groove and is fixedly connected to the mounting block.

[0015] As a further description of the above technical solution:

[0016] The top of the insert block is provided with a positioning piece, and the surface of the positioning piece is provided with threaded fasteners. The inner sides of the U-shaped block are provided with guide rails, and the guide rails are slidably connected to the mounting block.

[0017] This utility model has the following beneficial effects:

[0018] In this invention, an adjustment mechanism is set up so that when the turntable is rotated, it drives the worm gear to rotate. The worm gear drives the bidirectional lead screw to rotate through the transmission with the worm wheel. The bidirectional lead screw drives the ball slider to move in opposite directions on its surface through the helical transmission, thereby adjusting the position of the foot pedal on the top of the mounting block to adapt to the usage habits of different users and improve comfort. An extension component is set up to adapt to users with different length requirements and meet the exercise effect. The position of the mounting block on the U-shaped seat can be adjusted according to the site requirements to improve space utilization. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a sit-up resistance band for health promotion proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the adjustment mechanism of a sit-up resistance band for health promotion proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the extension component of a sit-up resistance band for health promotion proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the guide rail for a sit-up resistance band for health promotion proposed in this utility model;

[0023] Legend:

[0024] 1. U-shaped seat; 2. Mounting block; 3. Foot pedal; 4. Turntable; 5. Adjustment mechanism; 501. Worm gear; 502. Worm wheel; 503. Two-way lead screw; 504. Ball bearing slider; 505. Positioning plate; 6. Slide groove; 7. Vertical plate; 8. Rod body; 9. Movable block; 10. Extension assembly; 1001. Sleeve; 1002. Telescopic rod; 1003. Positioning hole; 1004. Spring latch; 11. Tensioner; 12. Groove; 13. Insert block; 14. Positioning piece; 15. Guide rail. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figure 1-4 An embodiment of this utility model is provided: a sit-up resistance band for health promotion, including a U-shaped seat 1, an installation block 2 installed at the front opening of the U-shaped seat 1, a groove 6 opened on the top surface of the installation block 2, foot pedals 3 installed through the groove 6 on both sides of the top of the installation block 2, a turntable 4 provided at the front end of the installation block 2, a locking knob provided through the surface of the turntable 4, and an adjustment mechanism 5 provided extending from the turntable 4 into the interior of the installation block 2;

[0027] The adjustment mechanism 5 includes a worm 501 and a worm wheel 502. The worm 501 and the worm wheel 502 are connected by a transmission. A bidirectional lead screw 503 is fixedly sleeved inside the worm wheel 502. Two ball sliders 504 are sleeved on both sides of the surface of the bidirectional lead screw 503. A positioning plate 505 is fixedly connected to the bottom end of the ball sliders 504. The top of the ball sliders 504 is fixedly connected to the foot pedal 3.

[0028] The top two sides of the U-shaped seat 1 are equipped with upright plates 7, and rods 8 are installed between the upright plates 7. A movable block 9 is movably sleeved on the middle section of the outer surface of the rod 8.

[0029] Extension components 10 are provided on both sides of the top of the movable block 9. The extension components 10 include a sleeve 1001. A telescopic rod 1002 is sleeved inside the sleeve 1001. Several positioning holes 1003 are opened on the outer surface of the sleeve 1001. A spring button 1004 is provided through the surface of one of the positioning holes 1003, and the spring button 1004 is threaded through the positioning hole 1003 and connected to the telescopic rod 1002.

[0030] A tensioner 11 is fixedly installed on the top of the telescopic pole 1002. The tensioner 11 is composed of an elastic rod and a handle.

[0031] The U-shaped frame 1 has grooves 12 on both sides, and inserts 13 are provided through the surface of the grooves 12. The inserts 13 pass through the grooves 12 and are fixedly connected to the mounting block 2.

[0032] The top of the insert block 13 is provided with a positioning piece 14, and a threaded fastener is provided through the surface of the positioning piece 14. The inner sides of the U-shaped block 1 are provided with guide rails 15, and the guide rails 15 are slidably connected to the mounting block 2.

[0033] Specifically, during use, the foot is placed inside the foot pedal 3 and fixed in place. The U-shaped seat 1 is then fixed to the ground via the positioning holes and positioning bolts around its perimeter. Following user preference, the handle on the turntable 4 is manually gripped to rotate it. The turntable 4 rotates the worm gear 501, which in turn rotates the worm wheel 502 via the intersecting shaft motion. The worm wheel 502 then rotates the double-acting screw 503. The double-acting screw 503 employs a centrally symmetrical double-thread design, causing the ball bearing slider 504 to move in opposite directions via its surface thread transmission. The top of the ball bearing slider 504 is connected to the foot pedal 3, allowing for adjustment of the foot pedal's spacing. After adjustment, the locking knob on the surface of the turntable 4 is rotated to fix the turntable 4 to the front end of the mounting block 2, completing the process. The lead screw is limited by manually pressing the spring latch 1004 at the positioning hole 1003 according to the usage requirements. This will cause the telescopic rod 1002 to be pulled out of the sleeve 1001, which will extend the structure of the tensioner 11 to accommodate users of different heights. After releasing the spring latch 1004, the spring will pop out of the positioning hole 1003 to fix the length. The tensioner 11 can be moved at the rod body 8 through the movable block 9, which is convenient for users to swing and use. The position of the mounting block 2 can be easily adjusted according to different usage site conditions. The insertion block 13 can be moved manually in the groove 12. The insertion block 13 drives the mounting block 2 to move inside the U-shaped seat 1 through the guide rail 15, thereby adjusting the space required for exercise.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sit-up resistance band for health promotion, comprising a U-shaped base (1), characterized in that: An installation block (2) is installed at the front opening of the U-shaped seat (1). A groove (6) is provided on the top surface of the installation block (2). Foot pedals (3) are installed through the groove (6) on both sides of the top of the installation block (2). A turntable (4) is provided at the front end of the installation block (2). A locking knob is provided through the surface of the turntable (4). An adjustment mechanism (5) is provided inside the installation block (2) extending from the turntable (4). The adjustment mechanism (5) includes a worm (501) and a worm wheel (502). The worm (501) and the worm wheel (502) are connected in a transmission. A double-acting screw (503) is fixedly sleeved inside the worm wheel (502). Two ball bearing sliders (504) are sleeved on both sides of the surface of the double-acting screw (503). A positioning plate (505) is fixedly connected to the bottom end of the ball bearing slider (504). The top of the ball bearing slider (504) is fixedly connected to the foot pedal (3).

2. The sit-up resistance band for health promotion according to claim 1, characterized in that: The top two sides of the U-shaped seat (1) are equipped with upright plates (7), and rods (8) are installed between the upright plates (7). A movable block (9) is movably sleeved on the middle section of the outer surface of the rod (8).

3. The sit-up resistance band for health promotion according to claim 2, characterized in that: The top two sides of the movable block (9) are provided with extension components (10). The extension components (10) include a sleeve (1001). A telescopic rod (1002) is sleeved inside the sleeve (1001). A plurality of positioning holes (1003) are opened on the outer surface of the sleeve (1001). A spring button (1004) is provided through the surface of one of the positioning holes (1003), and the spring button (1004) is threaded through the positioning hole (1003) and connected to the telescopic rod (1002).

4. A sit-up resistance band for health promotion according to claim 3, characterized in that: A tensioner (11) is fixedly installed on the top of the telescopic rod (1002), and the tensioner (11) is composed of an elastic rod and a handle.

5. A sit-up resistance band for health promotion according to claim 1, characterized in that: The U-shaped base (1) has grooves (12) on both sides, and a plug (13) is provided through the surface of the groove (12). The plug (13) passes through the groove (12) and is fixedly connected to the mounting block (2).

6. A sit-up resistance band for health promotion according to claim 5, characterized in that: The top of the insert (13) is provided with a positioning piece (14), and the surface of the positioning piece (14) is provided with threaded fasteners. The inner sides of the U-shaped seat (1) are provided with guide rails (15), and the guide rails (15) are slidably connected to the mounting block (2).

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