CN116723816A - Trapezius acupressure massage device - Google Patents

Abstract

The invention discloses a trapezius muscle acupressure type massage device. The trapezius muscle acupressure type massage device of the present invention can keep the user's head in a naturally fixed position by forming a backbrain placement portion and a cervical vertebra placement portion closely along the curves of the back of the user's head and nape of the neck. Therefore, the piston of the trapezius acupressure module can perform accurate and stable acupressure on the trapezius muscle, thereby relaxing and strengthening the muscles around the trapezius muscle, thereby guiding smooth blood circulation and activating blood circulation, and thus Improve the therapeutic effect through acupressure, traction and stretching that promote metabolism.

Description

Trapezius acupressure massage device

Technical field

The present invention relates to a trapezius muscle acupressure type massage device. More specifically, it relates to an acupressure function that utilizes air pressure to repeatedly pressurize and retreat the trapezius muscles located on both shoulder sides of the human body with the cervical vertebra as the center. This is a trapezius muscle acupressure type massage device that relieves muscle tension around the trapezius muscle and smoothes blood circulation.

Background technique

One of the diseases that frequently occurs due to lack of exercise and the increase in people working in the same posture for long periods of time is lumbar disc herniation. In particular, these days, laptops, tablets, and smartphones are included in all devices regardless of gender, age, or gender. As the use of various mobile devices increases, the number of people suffering from diseases of the cervical spine, which is the part between the skull and the thoracic vertebrae that is the backbone, among the parts constituting the spine, is rapidly increasing.

On the one hand, the spine is composed of a vertebral body as a central body, an arcuate vertebral arch protruding backward and upward from the vertebral body, and a plurality of protrusions. A large vertebral foramen is formed in the center surrounded by the vertebral body and the vertebral arch. This kind of spine suffers from spinal diseases due to long-term incorrect posture, muscle aging, and strong impact from the outside. Most spinal diseases can be caused by abnormal force exerted on the spine, that is, from normal sitting or standing postures or sleeping. Find out the cause from the lifestyle habits such as posture. For children and teenagers who are in the growth and development period, if the spine is abnormal, the growth line will be compressed, which will hinder the secretion of growth hormone and cause problems that hinder growth and development. .

In particular, the recent increase in the use of smartphones regardless of gender or age has led to a sharp increase in the number of people suffering from diseases of the cervical spine, which is the part between the skull and the thoracic vertebrae that is the backbone, which constitutes the spine. That is, the cervical vertebrae are generally called cervical vertebrae in the spine of our body and are composed of seven vertebrae segments. A hole for the cervical vertebrae artery to pass is formed in the transverse protrusion of each cervical vertebrae, and there are veins around it. The brachial plexus is connected to the body below and the head above, so it can be considered an important part of the body. This cervical vertebra is the same as the thoracic vertebra and lumbar vertebrae, and is greatly affected by human posture, and has various consequences caused by it. Musculoskeletal diseases. As an example, cervical disc herniation can occur in the same way as other spinal disc herniations. The ligaments that support the cervical spine from the back are deformed, and the cervical spine muscles become stiff for various reasons and compress the nerves. Eventually, headaches may occur. , cervical pain, shoulder and arm pain and other skeletal and muscle diseases.

Generally, in order to treat low back pain or shoulder and arm pain, physical therapy to strengthen muscles or stimulate acupuncture points to smooth blood circulation is widely used to treat or even alleviate the disease state. In addition, spine The disease preferably relaxes the compressed spinal discs by widening the distance between the vertebrae, thereby accurately correcting the body shape through relaxation. That is, acupressure or massage is a hand therapy that mainly uses hands to directly give mechanical stimulation to the skin through a certain method, thereby causing biological reactions, thereby correcting changes in the body to treat diseases and improve health. Acupressure/massage promotes Blood circulation or lymph circulation accelerates metabolism, improves tissue nutrition, excretes aging substances, and enhances resistance. This kind of tactile acupressure stimulates nerves and causes analgesic effects. Therefore, it has the effect of promoting the recovery of paralyzed nerves and promptly correcting changes in visceral function.

However, most of this acupressure/massage cannot be performed by the person receiving the treatment alone, so it is troublesome to receive help from other people. In addition, since it is performed by human strength, there is a problem that the effect is not fixed. In order to solve this problem, various forms of acupressure/massage instruments that can receive acupressure/massage by themselves have been developed and used in the past. Such instruments are mainly divided into vibration massage instruments that use a driving source to vibrate acupressure elements and An air pressure massage device that uses air pressure. However, in the case of a vibration massage device, a part of the body is repeatedly hit (thumped). Therefore, not only is the acupressure effect low, but it also has the disadvantage of causing secondary pain due to the blow. , In addition, in order to accurately transmit the vibration of the acupressure piece to the body, it is necessary to use the acupressure piece to press the body part with a certain force, so it is not only inconvenient to use, but also labor-intensive, and has the problem of being difficult to use continuously.

In addition, an air pressure massage device is a device that repeatedly applies pressure to a part of the body by injecting and discharging air into a cuff that surrounds the body parts such as arms, legs, or waist. This device simply kneads a part of the body. , so it is not only difficult to expect the acupressure effect of stimulating acupuncture points, etc., but also needs to be worn on the body's arms, legs, waist, etc., so it has the disadvantage of being troublesome to use. In addition, this air pressure massage instrument has the ability to move up and down by applying air pressure. A therapeutic instrument with a shaped cuff that expands to exert traction. This therapeutic instrument also needs to be worn on the neck or waist, etc., so it is inconvenient to use. Moreover, when the air pressure is ineffective, not only is it difficult to respond quickly, Furthermore, sufficient traction effect cannot be obtained, so the therapeutic effect is low.

In particular, as a prior art technology that relaxes the cervical vertebrae and simultaneously compresses the suboccipital muscle or its peripheral parts to improve the flow of cerebrospinal fluid, a functional cervical pillow has been proposed in Patent Publication No. 10-1665115 (2016.10.12.) , specifically, it is recorded that when lying on the back, the cervical spine is maintained in a "C" shape, and acupressure on the first cervical vertebra is used to relieve the tension and pain of the neck muscles. When lying on the side, without pressing the shoulders, Technology related to a functional cervical pillow that enables sleeping in a comfortable and correct posture. It is configured to maintain the curvature of the cervical vertebrae and at the same time perform acupressure on the first cervical vertebra to acupressure the suboccipital muscles. Therefore, it has some similarities with the present invention. However, it only maintains the curvature of the cervical spine and does not include the function of relaxing the cervical spine and moving the cervical muscles. It also does not include the structure used together with the suboccipital muscles to compress the ventricles, so it does not have the function of smoothing the flow of cerebrospinal fluid. Shortcomings.

As yet another prior art, Granted Patent Publication No. 10-1077885 (2011.10.31.) relates to a fascial relaxation instrument for physical therapy, and more specifically, describes technology related to a fascial relaxation instrument for physical therapy. , the fascial relaxation instrument for physical therapy includes: a main body, placed horizontally on the floor; an occipital acupressure part, protruding from one side of the main body to support acupressure on the occipital bone; a suboccipital support part, on the main body The front side of the occipital acupressure part is protrudingly formed to be higher than the occipital acupressure part to support the lower part of the occipital acupressure; and the upper thoracic vertebrae acupressure part supports the back of the neck while preventing the main body from being Push it open and form a protrusion at the front side of the suboccipital support part of the main body to perform acupressure on the upper thoracic vertebrae. However, this fascial relaxation instrument for physical therapy only uses multiple protrusions to simply compress the suboccipital muscle and its surroundings. structure, there is a problem that no therapeutic effect can be expected.

Contents of the invention

technical problem

The present invention is proposed to solve the problems of the prior art as described above. The purpose of the present invention is to provide a trapezius muscle acupressure type massage device, which is configured to move from the human body to the trapezius muscle acupressure type massage device. The back of the skull begins to attach to the 1st and 2nd cervical vertebrae, thereby providing a massage effect and relaxation through acupressure and stretching by air pressure along the shape of the suboccipital muscles, which are muscles that stabilize the head. The effect of muscles can thereby improve the treatment effect of cervical spine diseases such as turtle neck or straight neck caused by excessive use of smartphones or poor posture.

Technical solutions

In order to achieve the above object, a massage device for cervical spine according to a preferred embodiment of the present invention is characterized in that the trapezius muscle acupressure type massage device is composed of a body and a trapezius muscle acupressure module, and the body is formed with a back head. The placement part and the cervical vertebra placement part, the backbrain placement part has a curved curvature to support the back of the human body, the cervical vertebra placement part has a curved upward curvature from the backbrain placement part and has a downward curvature again to support the back of the human body. One side of the backbrain placement part is placed on the back part of the human body's neck, and a pair of the trapezius muscle acupressure modules are spaced left and right on the side of the cervical vertebra placement part of the body, thereby selectively supplying The air pressure protrudes the acupressure head, thus pressurizing and supporting the trapezius muscle.

As a preferred feature of the present invention, the trapezius acupressure module is composed of: a cylinder fixedly provided on the inner side of the body; and is disposed on the inner side of the cylinder so as to selectively supply air pressure from the outside. An air bag that expands or contracts by discharging gas; a piston that is provided on one side of the air bag so as to move linearly in conjunction with expansion and contraction of air pressure; a piston that is provided on one side of the piston that moves linearly in conjunction with the expansion and contraction of air pressure; The acupressure head is pressurized and supported by contact with the trapezius muscle; and a return spring has one end supported by the piston and the other end supported by the cylinder, thereby exerting an elastic support force to cause the piston to retreat.

As another preferred feature of the present invention, the air bag is connected to an air pump equipped with a solenoid valve for generating high-pressure air or forced exhaust, and the acupressure head is internally supplied with power to generate vibrations. It is a vibration motor that receives a signal to operate when the air pump supplies air to the air bag, and receives a signal to stop operating when the air pump exhausts the air bag.

As another preferred feature of the present invention, the piston is formed with an insertion groove on one side, an adapter is detachably assembled in the insertion groove, and an acupressure head is combined with an insertion structure on one side of the adapter, The acupressure head is a linear type arranged in a straight line on the piston or one end is inserted into the adapter and the other end of the acupressure head has an axis eccentric with respect to the adapter to be able to follow the body's curves. Trapezius spacing can be adjusted with either of the flex acupressure heads.

As yet another preferred feature of the present invention, the cylinder is formed with an accommodating portion for accommodating an air bag inside and a tubular member extending elongatedly from one side of the accommodating portion into which a piston is slidably inserted. Guide part; one end of the piston is slidably inserted into the receiving part so that it can move forward and backward. The end of the piston located in the receiving part is formed with an enlarged diameter to prevent the piston from being guided from the guide part. The other end of the protruding flange from the guide part is formed with an insertion slot for the acupressure head to be inserted and combined; the recovery spring is a coil with one end supported by the flange and the other end supported by the accommodation part of the cylinder. spring.

Invention effect

According to the trapezius muscle acupressure type massage device of the present invention, the user's head can be kept natural by forming a backbrain resting portion and a cervical vertebra resting portion closely along the curves of the back of the user's head and nape of the neck. Fixed state, therefore, the piston of the trapezius acupressure module can perform accurate and stable acupressure on the trapezius muscle, thereby relaxing and strengthening the muscles surrounding the trapezius muscle, thereby guiding smooth blood circulation and activating blood circulation, and then improve the therapeutic effect through acupressure, traction and stretching that promote metabolism.

That is, the trapezius muscle acupressure type massage device of the present invention allows the user's back of the head and neck to lie down comfortably through the shapes of the back of the head resting part and the cervical vertebra resting part, with the head fixed. By completing the operation at the same time, you can use the acupressure head to expect accurate acupressure effects, and because air pressure is used, not only is the risk of safety accidents caused by equipment failure low, but it can also prevent existing motors or solenoid valves from being damaged. The risk of injury or pain caused by excessive physical force, such as pressure, traction, or stretching, can be safely used, and useful effects can be expected to increase consumer satisfaction with the product.

In addition, the trapezius muscle acupressure type massage device of the present invention has a simple structure and is therefore easy to move and store, thereby minimizing the user's psychological burden and having the advantage of being able to be used in a stable and comfortable posture.

Description of the drawings

1 is a perspective view showing a trapezius acupressure type massage device according to the present invention,

Figure 2 is a perspective view of Figure 1 viewed from behind,

3 is a perspective view showing a trapezius muscle acupressure type massage device according to the present invention,

Fig. 4 is a perspective view showing the operating state of Fig. 3;

Figure 5 is a view of Figure 3 viewed from above.

6 is an exploded perspective view for explaining the structure of the present invention;

Figure 7 is a perspective view showing a bending acupressure head according to the present invention.

Reference signs:

1: Massage device for cervical spine, 10: Main body, 10a: Backbrain placement part, 10b: Cervical vertebra placement part, 11: Main body, 15: Tray, 17: Acupressure tablet, 20: Trapezius acupressure module, 21: Air cylinder, 21a: Accommodation part, 21b: Guide part, 22: Air bag, 22a: Port, 23: Piston, 23a: Insertion groove, 23b: Flange, 24: Adapter, 25: Finger pressure head, 26: Bending finger pressure head , 27: Recovery spring.

Detailed ways

The structure and function of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the specific disclosed form, and includes all modifications, equivalents, and substitutions included in the concept and technical scope of the present invention.

FIG. 1 is a perspective view of a trapezius muscle acupressure type massage device according to the present invention viewed from the front. In the figure, it is shown that a main body 11 is formed with a backbrain placement portion 10a and a cervical vertebra placement portion 10b having corresponding curved shapes in order to respectively place the backbrain and cervical vertebra portions of the human body; and is provided on the cervical vertebra placement portion. 10b, the main body 10 is composed of a plurality of acupressure pieces 17 that are raised and lowered by a driving source to perform acupressure on the cervical vertebra part of the human body; and a tray 15 that supports the main body 11 rotatably left and right. The trapezius muscle acupressure type massage device 1 is provided with a trapezius muscle acupressure module 20 on one side of the body 10 to provide a massage effect to the trapezius muscle of the human body through a pressurizing effect.

FIG. 2 is a perspective view of FIG. 1 viewed from behind. In the figure, a trapezius muscle acupressure type massage device 1 is illustrated. The trapezius muscle acupressure type massage device 1 is provided with a main body 10 and a trapezius muscle acupressure module 20. The main body 10 is provided with a space for placing a human body. The trapezius muscle acupressure module 20 is provided on one side of the main body 10, that is, on one side of the backbrain placement portion 10a, so as to control the human body. Apply compression to the trapezius muscles extending from the two shoulders to the neck.

3 is a perspective view showing the trapezius muscle acupressure type massage device according to the present invention. In the figure, a trapezius muscle acupressure module 20 is illustrated. The trapezius muscle acupressure module 20 is composed of: a cylinder 21 that forms the entire shape; and is provided on the inner side of the cylinder 21 to selectively expand. The air bag 22 with contraction function is provided on one side of the air bag 22 so as to move linearly in conjunction with the piston 23 during expansion and contraction; the piston 23 is provided at one end of one side of the piston 23 so as to protect the human body. It consists of an acupressure head 25 for pressurizing the trapezius muscle part and a return spring 27 for exerting elastic support force on the piston 23 .

FIG. 4 is a perspective view showing the operating state of FIG. 3 . The figure shows a state in which the air bag 22 provided on the inner side of the cylinder 21 is inflated. When the air bag 22 is inflated, the flange 23b portion of the piston 23 moves in conjunction with the expansion force. As a reference, the trapezius acupressure module 20 moves linearly to the left.

FIG. 5 is a view of FIG. 3 viewed from above. In the figure, the trapezius muscle acupressure module 20 is illustrated. The trapezius muscle acupressure module 20 is composed of a cubic-shaped accommodating part 21a and a tubular guide part 21b protruding to one side of the accommodating part. Cylinder 21; one end is slidably inserted into the guide portion 21b of the cylinder 21, and a tubular piston 23 is formed on the receiving portion 21a side with a flange 23b whose diameter is enlarged to prevent separation from the guide portion 21b; provided on the piston 23 between the flange 23b and the accommodating part 21a, so that the air bag 22 is selectively supplied with air pressure from the outside for expansion; each is supported between the flange 23b opposite to the air bag 22 and the accommodating part 21a, so that The restoring spring 27 exerts an elastic supporting force to move in the direction in which the piston 23 retreats; and is connected to the end of the piston 23 exposed to the outside of the guide part 21b of the cylinder 21, so as to exert pressure on the trapezius muscle of the human body. The acupressure head 25 is made of cushioning silicone or rubber which makes pressure contact.

6 is an exploded perspective view for explaining the structure of the present invention. In the figure, a trapezius muscle acupressure module 20 fixed inside the body 10 through a plurality of screw components is illustrated. The trapezius muscle acupressure module 20 is composed of: having a cubic shape, and is used to apply to a The cylinder 21 is composed of an open accommodating part 21a of the side assembly component and a guide part 21b protruding from one side of the accommodating part 21a and having a hollow interior; The air bag 22 is supplied with air pressure or is forced to exhaust to complete the expansion and contraction functions; one end is inserted into the guide portion 21b of the cylinder 21, so that an enlarged diameter is formed at one end located in the accommodating portion 21a The flange 23b, the other end of the piston 23 is exposed to the outside of the guide part 21b; it is sleeved on the outside of the piston 23, one end is supported by one side of the flange 23b, and the other end is supported by one side of the accommodation part 21a , thereby exerting an elastic support force on the piston 23 in the backward direction; an adapter 24 sleeved on the other end of the piston 23 exposed from the guide portion 21b; and a finger sleeved on the adapter 24 The pressure head 25 is formed.

Although not shown in the figure, the air bag 22 is connected to an air pump equipped with a solenoid valve in order to generate high-pressure gas or force exhaust gas.

Figure 7 is a perspective view showing a bending acupressure head according to the present invention. In the figure, there is shown a bending acupressure head 26 with one end inserted into the adapter 24 and the other end bent multiple times at right angles, thereby having an axis eccentric relative to the end inserted into the adapter 24 .

Hereinafter, the structure of the cervical spine massage device according to the present invention will be described.

The present invention is generally composed of a body 10 and a trapezius acupressure module 20. The body 10 is formed with a backbrain placement part 10a and a cervical spine placement part 10b. The backbrain placement part 10a has a curved curvature to support the backbrain of the human body. The cervical vertebra placement portion 10b forms a curved upward curvature relative to the backbrain placement portion 10a and simultaneously forms a downward curvature to place the rear portion of the neck to one side of the backbrain placement portion 10a, and the trapezius muscle A pair of acupressure modules 20 are arranged on the side of the cervical vertebra placement part 10b of the main body 10 at intervals to the left and right, so as to selectively supply air pressure to protrude the acupressure head 25, thereby pressurizing and supporting the trapezius muscles of the human body. .

The main body 10 is roughly composed of a main body 11 that forms an outer shape, and a tray 15 that supports the main body 11 so as to be rotatable left and right.

The main body 11 is provided with an ergonomically curved cervical vertebra placement portion 10b and a backbrain placement portion 10a on the upper portion to naturally place the human body's cervical vertebrae and backbrain when the user places their head on the upper portion of the body 10 , the back of the head and the cervical vertebra are in close contact with the back of the head resting part 10a and the cervical vertebra resting part 10b respectively, thereby suppressing movement.

The trapezius muscle acupressure module 20 consists of: a cylinder 21 installed on the inner side of the body 10 through a plurality of screw components; and is provided on the inner side of the cylinder 21 to selectively supply air pressure from the outside. An air bag 22 that expands or contracts by discharging gas; a piston 23 provided on one side of the air bag 22 so as to move linearly in conjunction with expansion and contraction of air pressure; provided on one side of the piston 23, The acupressure head 25 performs acupressure by pressing around the trapezius muscle of the human body; and one end is supported by the piston 23 and the other end is supported by the cylinder 21, thereby acting elastically in the direction in which the piston 23 retreats. It is composed of a restoring spring 27 of force.

The cylinder 21 has a structure formed with an accommodating part 21a that provides a rectangular space for accommodating the air bag 22 inside, and a guide part 21b that serves as a link from the accommodating part 21a. The piston 23 is slidably inserted into a hollow tubular member extending long on its side.

The piston 23 is a pipe-shaped member having a predetermined length, and is an operating member that is slidably inserted into the guide portion 21 b of the cylinder 21 to linearly move forward and backward. The piston 23 has an insertion groove 23a formed on one side, and the adapter 24 is detachably assembled in the insertion groove 23a.

The piston 23 has a protruding flange 23 b with an enlarged diameter at one end of the accommodation portion 21 a. The flange 23 b prevents the piston 23 from being detached from the guide portion 21 b of the cylinder 21 . Then, the piston has a structure in which an insertion groove 23 a into which the acupressure head 25 is inserted and coupled is formed at the other end of the piston 23 opposite to the flange 23 b.

The air bag 22 is connected to an air pump equipped with a solenoid valve for generating high-pressure gas or forcibly exhausting air. Although not shown, the air pump is configured to receive a control signal from a controller and operate.

The adapter 24 serves as a connecting member with one end inserted into the insertion groove 23 a of the piston 23 and the other end inserted with the acupressure head 25 described below, and can be omitted when not needed.

The acupressure head 25 pressurizes and contacts the muscles around the trapezius muscle of the human body to perform acupressure. It can be provided by cushioning silicone or rubber or mineral materials with excellent far-infrared radiation, and can be provided in the piston 23 A linear configuration or as shown in Figure 7, provided with one end inserted into the adapter while the other end for acupressure of the trapezius muscle has an axis eccentric with respect to the adapter to be able to follow the trapezius of the human body 26-shaped bending acupressure head that adjusts the intermuscular space.

In addition, the acupressure head 25 is internally supplied with power to generate vibration. When the air pump supplies air to the air bag 22, it receives a signal and operates, and when the air pump performs the exhaust operation of the air bag 22 When the signal is received, the vibration motor stops running.

The return spring 27 is a coil spring with one end supported by the flange 23 b and the other end supported by the accommodating portion 21 a of the cylinder 21 , and acts elastically in a direction to retreat with respect to the piston 23 that moves forward due to expansion of the air bag 22 . The supporting force is an element that enables the air bag 22 to quickly return to its original position when the air in the air bag 22 is discharged.

Claims (5)

1. A trapezius muscle acupressure type massage device, characterized in that the trapezius muscle acupressure type massage device is composed of a body and a trapezius muscle acupressure module, and the body is formed with a backbrain placement part and a cervical spine placement part. , the backbrain placement part has a curved curvature to support the backbrain of the human body, and the cervical vertebra placement part has a curved upward curvature from the backbrain placement part and at the same time has a downward curvature again to a direction of the backbrain placement part. The back part of the neck of the human body is placed sideways, and a pair of the trapezius muscle acupressure modules are spaced left and right on the side of the cervical vertebra placement part of the body, thereby selectively supplying air pressure and protruding the acupressure head. , thereby compressing and supporting the trapezius muscle. 2. The trapezius muscle acupressure type massage device according to claim 1, wherein the trapezius muscle acupressure module consists of: a cylinder fixedly provided on one side of the interior of the body; An air bag that is provided on one side of the air bag so that it can move linearly in conjunction with the expansion and contraction of the air pressure. a piston; an acupressure head provided on one side of the piston to pressurize and support it by contacting the trapezius muscle; and one end is supported by the piston and the other end is supported by the cylinder, thereby exerting an elastic support force to make the It is composed of a return spring for the piston to retreat. 3. The trapezius muscle acupressure type massage device according to claim 1, wherein the air bag is connected to an air pump equipped with a solenoid valve for generating high-pressure air or forced exhaust, and the acupressure head Power is supplied internally to generate vibrations. The acupressure head receives a signal and operates when the air pump supplies air to the air bag. When the air pump exhausts the air bag, it receives a signal and stops. A running vibration motor. 4. The trapezius muscle acupressure type massage device according to claim 1, wherein the piston has an insertion slot formed on one side, and an adapter is detachably assembled in the insertion slot, and the adapter is One side of the acupressure head is combined with an acupressure head in an insertion structure. The acupressure head is a linear type arranged in a straight line on the piston or one end is inserted into the adapter and the other end of the acupressure head has a shape relative to the trapezius muscle. The adapter's eccentric axis bends either acupressure head in a manner that can be adjusted along the body's trapezius muscle spacing. 5. The trapezius muscle acupressure type massage device according to claim 2, characterized in that the cylinder is formed with an accommodating portion for accommodating an air bag inside and a long portion extending from one side of the accommodating portion. A tubular member with a guide portion of a piston slidably inserted inside; one end of the piston is slidably inserted into the accommodating portion so that it can move forward and backward, and one end of the piston is located in the accommodating portion. A flange is formed whose diameter is enlarged to prevent the piston from detaching from the guide part, and the other end protruding from the guide part is formed with an insertion groove for the acupressure head to be inserted and combined; the recovery spring is one end that is connected by the flange A coil spring that is supported at its other end by the housing of the cylinder.