Safety device for a pull-up machine

Abstract

This utility model discloses a safety device for a resistance band, consisting of seven plungers. The fourth plunger is the longest and has the largest diameter, with the diameters decreasing sequentially on both sides. The smaller diameter plunger can retract into the adjacent larger diameter plunger. The plungers are tightly fitted together by sealing rings and support rings. The first plunger is directly rigidly connected to the handle on one side of the resistance band. A spring seat is installed inside each of the seven plungers, and a spindle is mounted on the spring seat. A spring, a rubber stopper, and a pull ring are sequentially installed on the spindle. The other end of the pull ring is connected to the handle on the other end of the resistance band. This utility model overcomes the problem of ordinary spring resistance bands, where, when stretched, the resistance band swings violently due to the spring action, potentially causing injury if the hand accidentally slips off the handle. This utility model device is simple to operate and improves the safety of the resistance band operation.

Description

Technical Field

[0001] This utility model relates to the field of tensioner technology, and in particular to a safety device on a tensioner. Background Technology

[0002] When people use traditional resistance bands for resistance exercises, their hands may slip off the handles. When this happens, the resistance band swings violently under the action of the tension spring, which can easily cause injury. Utility Model Content

[0003] The purpose of this invention is to overcome the problem that when a resistance band is stretched, the hand may accidentally slip off the handle, causing the resistance band to swing forcefully and injure people. This invention provides a safety device for resistance bands, making the use of resistance bands safe and reliable.

[0004] To achieve the above objectives, the technical solution provided by this utility model

[0005] A safety device for a resistance band, the safety device for the resistance band consists of seven plunger sections, the plungers are tightly fitted together, the first plunger section is fixedly connected to a handle on one side of the resistance band, the seventh plunger section has a spring seat inside, the spring seat has a spindle, and the spindle has a spring, a rubber stopper and a pull ring installed in sequence, and is connected to the handle at the other end through the pull ring.

[0006] As a further technical solution, the plunger is a hollow tube, cylindrical in shape. The fourth section is the longest and has the largest diameter, with the diameters of the plungers on both sides decreasing sequentially. The smaller diameter plunger can retract into the adjacent larger diameter plunger, and the total length of the seven retracted plungers is equal to the length of the tension spring on the tensioner.

[0007] As a further technical solution, the connection between the plungers is stepped, one end of the plunger inner hole has a support ring groove for installing a support ring; the outer circle of the other end of the plunger has a sealing groove for installing a sealing ring, and the inner diameter of the support ring at the connection between two adjacent plungers is smaller than the outer diameter of the sealing groove.

[0008] As a further technical solution, in the two adjacent plunger sections, the outer circle of each plunger section is sealed by a sealing ring to the inner wall of the adjacent plunger section.

[0009] For a tight fit, the smaller diameter of the plunger's outer diameter and the larger diameter of the plunger's inner diameter are in a clearance fit.

[0010] As a further technical solution, a spring retainer groove is machined at one end of the inner bore of the fourth plunger to hold a spring retainer ring, and a support sleeve groove is machined to hold a support sleeve. The support sleeve is made of metal, and a support ring groove is machined on the support sleeve to hold a support ring made of Teflon. A support ring groove of the same size is also machined at the other end of the inner bore of the fourth plunger to hold a support ring of the same material and size. The inner diameter of the support ring is matched with that of the third and fifth plungers to provide support.

[0011] As a further technical solution, the third and fifth plunger sections have identical external dimensions. A sealing groove is machined at one end of their outer circumference to install a sealing ring. The outer diameter of the sealing ring tightly fits the inner diameters at both ends of the fourth plunger section, providing a sealing effect. Support ring grooves are machined at the inner diameters of the other ends of the third and fifth plunger sections, and support rings, made of Teflon, are installed thereon. The inner diameters of these support rings fit the outer diameters of the second and sixth plunger sections, providing support. Similarly, the second and sixth plunger sections have identical external dimensions. A sealing groove is machined at one end of their outer circumference to install a sealing ring. The outer diameter of the sealing ring tightly fits the inner diameters of the third and fifth plunger sections, providing a sealing effect. Support ring grooves are machined at the inner diameters of the other ends of the second and sixth plunger sections, and support rings, made of Teflon, are installed thereon. The inner diameters of these support rings fit the outer diameters of the first and seventh plunger sections, providing support.

[0012] As a further technical solution, the end of the seventh plunger in the plunger is tapered and fits tightly with the leather plug. The leather plug is fixedly connected and sleeved on the mandrel. The inner diameter of the tapered seal is smaller than the diameter of the spring and fits with the mandrel with a clearance.

[0013] The beneficial effects of this invention are as follows: This utility model improves upon traditional resistance bands by replacing the single-section spring in a safety device with a seven-section plunger. When the resistance band is used for stretching, the handle is pulled simultaneously, causing the rubber stopper on the spindle to disengage from the plunger. The plunger is pulled apart section by section, with the total stretched length of the plunger matching the stretched length of the tension spring. Air enters the entire plunger. If the hand slips off the handle at this time, the spindle is pulled back by the spring, and the rubber stopper is simultaneously pulled back and tightly adheres to the conical surface of the plunger, forming a sealed space inside the plunger. This maintains the stretched state, allowing the plunger to fall freely under the influence of gravity without swinging erratically and causing injury. If the hand does not slip off the handle, the plunger will contract section by section with the contraction of the tension spring, with the total length of the retracted plunger matching the length of the retracted spring. The resistance band can continue its normal stretching motion without being affected. The entire operation is simple and easy, following the normal stretching motion of the resistance band, thus improving the safety of the resistance band's operation.

[0014] The disassembly sequence is as follows: First, remove the first plunger from the tensioner handle. Then, remove the pull ring on the seventh plunger from the other end of the tensioner handle. Remove the spring retainer, support sleeve, and support ring on the fourth plunger. Then, remove the third, second, and first plungers in sequence, and the seventh, sixth, and fifth plungers in sequence.

[0015] This utility model provides a novel safety tensioner with the following advantages:

[0016] The plunger's components are simple to manufacture.

[0017] It is easy to install and disassemble, avoiding the problem of injury during the exercise of the resistance band. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the present utility model.

[0020] Figure 2 This is a cross-sectional view of the seventh plunger of this utility model.

[0021] Figure 3 This is a cross-sectional view of the fourth plunger of this utility model.

[0022] Figure 4 This is the support sleeve of the present utility model.

[0023] Figure 5 This is a cross-sectional view of the support sleeve of this utility model.

[0024] Figure 6 This utility model relates to a spring retainer.

[0025] Figure 7 This is the support ring of this utility model.

[0026] Figure 8 This is a cross-sectional view of the connection between the plungers of this utility model.

[0027] In the diagram, 1-Plunger 1, 2-Plunger 2, 3-Plunger 3, 4-Plunger 4, 5-Plunger 5, 6-Plunger 6, 7-Plunger 7, 8-Pulley, 9-Spring, 10-Handle 1, 11-Handle 2, 12-Spring Seat, 13-Spring, 14-Conical Seal, 15-Plug, 16-Spindle, 17-Spring Snap Ring Groove, 18-Spring Snap Ring, 19-Support Ring Groove, 20-Support Ring, 21-Support Sleeve, 22-Support Sleeve Groove, 23-Sealing Ring, 24-Sealing Groove Detailed Implementation

[0028] The present invention will be further described in detail below with reference to embodiments:

[0029] A safety device for a tensioner consists of seven plungers. A spring 9, a rubber stopper 15, and a pull ring 8 are sequentially installed on a spring seat 12 with a spindle 16. A plunger 7 is mounted on the spindle 16, with the spring 9 located within the inner cavity of the plunger 7. A conical seal 14 is then tightly fixed to the spindle 16, allowing it to move only with the spindle 16. A sealing ring 23 is installed in the sealing groove 24 of the plunger 7, and a support ring 20 is placed in the support ring groove 19 of the plunger 6. The plunger 7 is then installed as a whole into the plunger 6, ensuring a tight fit between the sealing ring 23 of the plunger 7 and the inner wall of the plunger 6, and a clearance fit between the support ring 20 on the plunger 6 and the outer diameter of the plunger 7. The plunger 5 is installed similarly. A support ring 20 is installed in the support ring groove 22 of plunger 4. Then, plungers 5, 6, and 7, which have already been installed, are installed onto plunger 4. Similarly, the sealing ring 23 of plunger 5 fits tightly against the inner wall of plunger 4, and the support ring 20 on plunger 4 has a clearance fit with the outer circle of plunger 5. Using the same installation method, plungers 1, 2, and 3 are installed and then mounted onto plunger 4. A support sleeve 20 is then installed in the support sleeve groove 22 of plunger 4, and a support ring 20 is installed in the support ring groove 22 on the support sleeve 21. A spring retainer 18 is installed in the spring retainer groove 17 to prevent plunger 3 from falling off. Finally, the pull ring 8 is connected to handle 2 11, and plunger 1 is connected to handle 1 10. The support sleeve is made of metal, and the support ring is made of Teflon.

[0030] When the resistance band is used for stretching, the handle 8 is pulled simultaneously. The leather plug 15 on the spindle 16 disengages from the plunger 7, and the plunger is pulled apart section by section. The total extension length of the plunger is consistent with the extension length of the tension spring, allowing air to enter the entire plunger. If the hand slips off the handle at this time, the spindle 16 will be pulled back by the spring, and the leather plug 15 will be pulled back at the same time and fit tightly against the conical surface of the plunger 7. The entire interior of the plunger forms a sealed space, maintaining the stretched state. Under the influence of gravity, it falls freely without swinging around and injuring people.

[0031] The embodiments and descriptions above are merely illustrative of the principles and preferred embodiments of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A safety device for use on a tensioner, characterized in that: The safety device on the tensioner consists of seven plungers that fit tightly together. The first plunger is fixedly connected to the handle on one side of the tensioner. The seventh plunger has a spring seat inside, and a spindle is mounted on the spring seat. A spring, a rubber stopper, and a pull ring are installed on the spindle in sequence, and the pull ring connects to the handle on the other end.

2. A safety device for a tensioner as described in claim 1, characterized in that... The plunger is a hollow tube and is cylindrical.

3. A safety device for a tensioner as described in claim 1, characterized in that... The seven plunger sections are arranged such that the fourth section is the longest and has the largest diameter, with the diameters of the plungers on both sides decreasing sequentially. The smaller diameter plunger can retract into the adjacent larger diameter plunger, and the total length of the seven plungers after retraction is equal to the length of the tension spring on the tensioner.

4. A safety device for a tensioner as described in claim 1, characterized in that... The connection between each two plungers is stepped. One end of the plunger's inner bore has a support ring groove for installing a support ring. The other end of the plunger has a sealing groove for installing a sealing ring. The inner diameter of the support ring at the connection between two adjacent plungers must be smaller than the outer diameter of the sealing groove.

5. A safety device for a tensioner as described in claim 1, characterized in that... The sealing ring of each plunger section is in tight fit with the inner wall of the plunger that it mates with, while the outer diameter of the smaller plunger is in clearance fit with the inner diameter of the larger plunger.

6. A safety device for a tensioner as described in claim 1, characterized in that... The end of the seventh plunger is tapered and fits tightly with the leather plug. The leather plug is fixedly connected to the mandrel. The inner diameter of the tapered seal is smaller than the spring diameter and has a clearance fit with the mandrel.

7. A safety device for a tensioner as described in claim 1, characterized in that: The fourth plunger has a spring retainer groove at one end of its inner bore to hold the spring retainer ring and a support sleeve groove to hold the support sleeve. The support sleeve has a support ring groove to hold the support ring. The other end of the fourth plunger's inner bore has a support ring groove to hold the support ring. The inner diameter of the support ring is the same as the outer diameter of the third and fifth plungers.

8. A safety device for a tensioner as described in claim 1, characterized in that... The third and fifth plunger sections have the same external dimensions, the second and sixth plunger sections have the same external dimensions, and the first and seventh plunger sections have the same external dimensions.

9. A safety device for a tensioner as described in claim 7, characterized in that... The support sleeve is made of metal, and the support ring is made of Teflon.

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