Patent Description:
As a nailing tool, a nail gun produces an impact force on a nail, thereby impacting the nail into a workpiece. Existing nail guns in the market may be classified as mechanical nail guns and cylinder-type nail guns according to a principle manner. The cylinder-type nail guns may be classified as nail guns with single-cylinder structures or nail guns with double-cylinder structures according to the number of cylinders. The manufacturing process of an existing double-cylinder structure is complicated, and the cost of the double-cylinder structure is relatively high.

In order that the deficiencies of the existing art are solved, an object of the present application is to provide a nail gun with a simple manufacturing process and a relatively low cost.

To achieve the preceding object, the present invention provides a nail gun according to claim <NUM>.

The nail gun includes: a housing formed with an accommodating space; a cylinder assembly at least partially disposed in the housing; a magazine assembly for storing nails; and a firing assembly used for striking a nail and at least partially disposed in the cylinder assembly. The cylinder assembly includes a first cylinder and a second cylinder, where the first cylinder includes a first cylinder cavity extending along the direction of a first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The nail gun further includes a first piston, where at least part of the first piston is disposed in the first cylinder cavity, and the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity. The first piston is provided with an air intake passage, where an external gas outside the cylinder assembly is capable of entering the first cylinder cavity through the air intake passage. The air intake passage includes an air intake hole, where the external gas is capable of entering the air intake passage through the air intake hole, and the air intake hole is disposed on a sidewall surface of the first piston.

In some examples, the air intake passage further includes an air outlet hole, where a gas in the air intake passage can leave the air intake passage through the air outlet hole and enter the first cylinder cavity.

In some examples, the air outlet hole and the air intake hole are disposed on different wall surfaces of the first piston.

In some examples, the first piston is configured such that when the first piston reciprocates along the direction of the first axis, at least part of the air intake passage can leave the first cylinder cavity, and when the air intake hole leaves the first cylinder cavity, the air intake hole can allow the external gas to enter the air intake passage through the air intake hole.

In some examples, the air intake hole can be closed by the inner wall of the first cylinder when entering the first cylinder cavity so that the external gas is prevented from entering the air intake passage through the air intake hole.

In some examples, the air intake passage is configured to have an L-shaped structure.

In some examples, the first piston is provided with at least two air intake passages.

In some examples, all of the air intake passages are symmetrically disposed around the second cylinder.

In some examples, the second cylinder includes a second cylinder cavity extending along the direction of a second axis, where the first axis is parallel to the second axis; and the firing assembly includes a second piston disposed in the second cylinder cavity, and the second piston is capable of reciprocating along the direction of the second axis in the second cylinder cavity.

In some examples, the cylinder assembly further includes a communication member for communicating with the first cylinder cavity and the second cylinder cavity, where a gas in the first cylinder cavity can enter the second cylinder cavity through the communication member.

In some examples, the first cylinder includes a first end and a second end, where the communication member is disposed at the first end, the second end is disposed opposite to the first end, and the second end is configured to be an opening.

In some examples, an air outlet port faces the communication member.

In some examples, an air intake port faces away from the first axis.

In some examples, the first piston is disposed in the first cylinder cavity.

In some examples, the cylinder assembly further includes a stopper member disposed at the second end, where the stopper member is used for preventing at least part of the first piston from leaving the first cylinder cavity.

In some examples, the firing assembly further includes an insertion member which can prevent the external gas from entering the first cylinder cavity from the air outlet hole, where a first insertion end of the insertion member is connected to the communication member, and a second insertion end of the insertion member can be inserted into the air intake passage from the air outlet hole.

In some examples, the air intake passage further includes a fixed slot disposed between the air intake hole and the air outlet hole. The first piston includes an insertion rod sealing member at least partially accommodated in the fixed slot. The insertion member further includes an intermediate portion disposed between the first insertion end and the second insertion end, where the intermediate portion is configured to be capable of fitting closely around the insertion rod sealing member to prevent the external gas from entering the first cylinder cavity through the air intake passage.

In some examples, the diameter of the second insertion end is less than the diameter of the intermediate portion, and the second insertion end cannot fit closely around the insertion rod sealing member so that the external gas is allowed to enter the first cylinder cavity through the air intake passage.

In some examples, the first cylinder includes an air valve assembly at least partially disposed in the air intake passage, where the air valve assembly can allow the external gas to enter the first cylinder cavity through the air intake passage and prevent the external gas from entering the first cylinder cavity through the air intake passage.

In some examples, the air valve assembly is configured such that when the first piston moves toward the first end along the first axis, the air valve assembly can prevent the external gas from entering the first cylinder cavity through the air intake passage.

The present application provides a nail gun. The nail gun includes: a housing formed with an accommodating space; a cylinder assembly at least partially disposed in the housing; a magazine assembly for storing nails; and a firing assembly used for striking a nail and at least partially disposed in the cylinder assembly. The cylinder assembly includes a first cylinder and a second cylinder, where the first cylinder includes a first cylinder cavity extending along the direction of a first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The nail gun further includes a first piston, where at least part of the first piston is disposed in the first cylinder cavity, the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity, the first piston is configured to be capable of forming an air intake passage with part of the outer wall of the second cylinder, and a gas is capable of passing through the air intake passage and entering the first cylinder cavity.

In some examples, the nail gun further includes a first sealing member, where the outer side of the first sealing member fits snugly around the first piston, and the inner side of the first sealing member fits snugly around part of the outer wall of the second cylinder. The first piston is capable of driving the first sealing member to move on the surface of the outer wall of the second cylinder. A slot is disposed on part of the surface of the outer wall of the second cylinder. The first cylinder is configured such that when the first sealing member is located in the slot, the air intake passage is formed between the first piston and the surface of the outer wall of the second cylinder and the gas is capable of passing through the air intake passage.

In some examples, the first piston is provided with a first accommodating groove for accommodating part of the first sealing member.

In some examples, the firing assembly further includes a second sealing member, where the inner side of the second sealing member fits snugly around the first piston, and the outer side of the second sealing member is capable of fitting snugly around the inner wall of the first cylinder. The first piston is capable of driving the second sealing member to slide on the surface of the inner wall of the first cylinder. The first cylinder is configured such that when the first sealing member moves to the position of the slot, the first sealing member forms part of the air intake passage with the surface of the outer wall of the second cylinder.

In some examples, the first piston is provided with a second accommodating groove for accommodating part of the second sealing member.

In some examples, the first sealing member and/or the second sealing member are O-shaped sealing rings.

In some examples, the first sealing member and/or the second sealing member are X-shaped sealing rings.

In some examples, the depth of the slot is <NUM> to <NUM>.

In some examples, at least two slots are disposed on part of the surface of the outer wall of the second cylinder.

In some examples, all of the slots are symmetrically disposed around the second axis.

In some examples, when the first sealing member is located in the slot, a spacing between the first sealing member and the surface of the outer wall of the second cylinder is greater than a minimum gap between the first piston and the surface of the outer wall of the second cylinder.

The present application provides a nail gun. The nail gun includes: a housing formed with an accommodating space; a cylinder assembly at least partially disposed in the housing; a magazine assembly for storing nails; and a firing assembly used for striking a nail and at least partially disposed in the cylinder assembly. The cylinder assembly includes a first cylinder and a second cylinder, where the first cylinder includes a first cylinder cavity extending along the direction of a first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The nail gun further includes: a first piston, where at least part of the first piston is disposed in the first cylinder cavity, and the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity; and a first sealing member, where the outer side of the first sealing member fits snugly around the first piston, and the inner side of the first sealing member fits snugly around part of the outer wall of the second cylinder. The first piston is capable of driving the first sealing member to move on the surface of the outer wall of the second cylinder, and distances between the first sealing member and the surface of the outer wall of the second cylinder are different from each other.

In some examples, in a radial direction, the distance between the first sealing member and part of the surface of the outer wall of the second cylinder is <NUM>, and the distance between the first sealing member and part of the surface of the outer wall of the second cylinder is greater than <NUM>.

In some examples, in a radial direction, a slot is disposed on part of the surface of the outer wall of the second cylinder, where the distance between the first sealing member and the slot of the second cylinder is greater than <NUM>.

The present application provides a nail gun. The nail gun includes: a housing formed with an accommodating space; a cylinder assembly at least partially disposed in the housing; a magazine assembly for storing nails; and a firing assembly used for striking a nail and at least partially disposed in the cylinder assembly. The cylinder assembly includes a first cylinder and a second cylinder, where the first cylinder includes a first cylinder cavity extending along the direction of a first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The first cylinder includes a first rear cylinder body and a first front cylinder body, where the inner diameter of the first front cylinder body is greater than the inner diameter of the first rear cylinder body. The first cylinder cavity extends along the direction of the first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The first cylinder cavity includes the cavity of the first rear cylinder body and the cavity of the first front cylinder body. The nail gun further includes a first piston, where at least part of the first piston is disposed in the first cylinder cavity, and the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity. The firing assembly includes a second sealing member, where the inner side of the second sealing member fits snugly around the first piston, the outer side of the second sealing member is capable of fitting snugly around the inner wall of the first rear cylinder body, and the first cylinder is configured such that the first piston forms an air intake passage with the surface of the inner wall of the first rear cylinder body and the gas is capable of passing through the air intake passage when the second sealing member is located in the cavity of the first front cylinder body, and the second sealing member abuts against the surface of the inner wall of the first rear cylinder body when the second sealing member is located in the cavity of the first rear cylinder body.

In some examples, when the second sealing member is located in the cavity of the first front cylinder body, the gap distance between the second sealing member and the surface of the inner wall of the first front cylinder body is greater than the gap between the first piston and the surface of the inner wall of the first rear cylinder body.

In some examples, the housing is formed with a mounting base for mounting the cylinder assembly, where the mounting base includes an air intake opening, an external gas outside the cylinder assembly can enter the housing through the air intake opening, and the external gas can pass through the air intake passage and enter the first rear cylinder body.

In some examples, the first cylinder further includes a first sealing member, where the outer side of the first sealing member fits snugly around the first piston, and the inner side of the first sealing member fits snugly around part of the outer wall of the second cylinder. The first piston is capable of driving the first sealing member to slide on the surface of the outer wall of the first front cylinder body.

In some examples, the difference between the inner diameter of the first front cylinder body and the inner diameter of the first rear cylinder body ranges from <NUM> to <NUM>.

In some examples, the length of the first front cylinder body ranges from <NUM> to <NUM>.

In some examples, the length of the first rear cylinder body ranges from <NUM> to <NUM>.

The present application provides a nail gun. The nail gun includes: a housing formed with an accommodating space; a cylinder assembly at least partially disposed in the housing; a magazine assembly for storing nails; and a firing assembly used for striking a nail and at least partially disposed in the cylinder assembly. The cylinder assembly includes a first cylinder and a second cylinder, where the first cylinder includes a first cylinder cavity extending along the direction of a first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The first cylinder includes a first rear cylinder body and a first front cylinder body, where the inner diameter of the first front cylinder body is greater than the inner diameter of the first rear cylinder body. The first cylinder cavity extends along the direction of the first axis, and at least part of the second cylinder is disposed in the first cylinder cavity. The first cylinder cavity includes the cavity of the first rear cylinder body and the cavity of the first front cylinder body. The nail gun further includes a first piston, where at least part of the first piston is disposed in the first cylinder cavity, and the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity. The firing assembly includes a second sealing member, where the inner side of the second sealing member fits snugly around the first piston, the outer side of the second sealing member is capable of fitting snugly around the inner wall of the first rear cylinder body, and the first cylinder is configured such that the gap distance between the second sealing member and the surface of the inner wall of the first front cylinder body is greater than the gap between the first piston and the surface of the inner wall of the first rear cylinder body when the second sealing member is located in the cavity of the first front cylinder body.

The present application has the following benefits: no hole needs to be punched on an external cylinder of the cylinder assembly of the nail gun provided in the present application so that the structural strength of the external cylinder is enhanced, the cost for punching holes is saved, and the possibility is avoided that the holes are blocked.

In this application, the terms "up", "down", "left", "right", "front", and "rear" " and other directional words are described based on the orientation or positional relationship shown in the drawings, and should not be understood as limitations to the examples of this application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected "above" or "under" another element, it can not only be directly connected "above" or "under" the other element, but can also be indirectly connected "above" or "under" the other element through an intermediate element. It should also be understood that orientation words such as upper side, lower side, left side, right side, front side, and rear side do not only represent perfect orientations, but can also be understood as lateral orientations. For example, lower side may include directly below, bottom left, bottom right, front bottom, and rear bottom.

In this application, the terms "controller", "processor", "central processor", "CPU" and "MCU" are interchangeable. Where a unit "controller", "processor", "central processing", "CPU", or "MCU" is used to perform a specific function, the specific function may be implemented by a single aforementioned unit or a plurality of the aforementioned unit.

In this application, the term "device", "module" or "unit" may be implemented in the form of hardware or software to achieve specific functions.

In this application, the terms "computing", "judging", "controlling", "determining", "recognizing" and the like refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

<FIG> illustrates a nail gun <NUM> as an example in the present application. In this specification, front, rear, left, right, up, and down are described as directions shown in <FIG>. Specifically, when the nail gun <NUM> is operated by a user, the direction in which a nail is shot off is defined as the front direction, and the extension direction of a magazine assembly is defined as an up and down direction.

Referring to <FIG>, the nail gun <NUM> includes a housing <NUM>, a power output assembly <NUM>, a cylinder assembly <NUM>, a magazine assembly <NUM>, and a firing assembly <NUM>.

The housing <NUM> is formed with a first accommodating space <NUM> and a second accommodating space <NUM>, where the cylinder assembly <NUM> is disposed in the first accommodating space <NUM>, and the power output assembly <NUM> is disposed in the second accommodating space <NUM>. The housing <NUM> is further formed with a handle <NUM> which can be held by the user. A power interface is connected to an end of the handle <NUM> and is configured to access a direct or alternating current power supply, for example, a direct current battery pack (not shown in the figure). A main switch <NUM> is disposed on the handle <NUM>, and the user controls, by using the main switch <NUM>, the nail gun <NUM> to start or stop. In this example, the housing <NUM> is further formed with a mounting base <NUM> for mounting the cylinder assembly <NUM>. The mounting base <NUM> is disposed at the other end of the handle <NUM> connected to the power interface.

The power output assembly <NUM> includes a prime mover <NUM> and a transmission apparatus <NUM>. The prime mover <NUM> is specifically an electric motor in this implementation. The transmission apparatus <NUM> is disposed between the prime mover <NUM> and the cylinder assembly <NUM>. The transmission apparatus <NUM> may specifically include a deceleration assembly and a connecting rod assembly. The deceleration assembly may specifically include a multi-stage planet gear system, and the connecting rod assembly includes a drive rod <NUM> for outputting power.

As shown in <FIG>, the cylinder assembly <NUM> is disposed in the first accommodating space <NUM> and includes a first cylinder <NUM> and a second cylinder <NUM>. The second cylinder <NUM> is partially or completely disposed in the first cylinder <NUM>. The first cylinder <NUM> includes a first cylinder cavity <NUM> extending along the direction of a first axis <NUM>, and the second cylinder <NUM> is partially or completely disposed in the first cylinder cavity <NUM>. The second cylinder <NUM> includes a second cylinder cavity <NUM> extending along the direction of a second axis <NUM>, where the first axis <NUM> is parallel to the second axis <NUM>. In some examples, the cylinder assembly <NUM> further includes a communication member <NUM> for communicating with the first cylinder cavity <NUM> and the second cylinder cavity <NUM>, where a gas in the first cylinder cavity <NUM> can enter the second cylinder cavity <NUM> through the communication member <NUM>. The first cylinder <NUM> includes a first end <NUM> and a second end <NUM> which are disposed opposite to each other, where the communication member <NUM> is disposed at the first end <NUM>, and a first cylinder opening <NUM> is disposed at the second end <NUM>.

The magazine assembly <NUM> is disposed in the direction of a third axis <NUM> perpendicular to the first axis <NUM>. The magazine assembly <NUM> is used for accommodating nails and is connected to the firing assembly <NUM>.

The firing assembly <NUM> is disposed in the cylinder assembly <NUM> and includes a first piston <NUM>, a second piston <NUM>, and a firing pin <NUM>. The first piston <NUM> is partially or completely disposed in the first cylinder cavity <NUM>. The second piston <NUM> is disposed in the second cylinder cavity <NUM>. One end of the drive rod <NUM> is connected to the first piston <NUM> and can push, under the rotation of the prime mover <NUM>, the first piston <NUM> to reciprocate along the direction of the first axis <NUM> in the first cylinder cavity <NUM> The second piston <NUM> can reciprocate along the direction of the second axis <NUM> in the second cylinder cavity <NUM>. The firing pin <NUM> is fixedly connected to the second piston <NUM>, and the second piston <NUM> is connected to the firing pin <NUM> and reciprocates along the direction of the second axis <NUM> in the second cylinder cavity <NUM>. The user fills the nails into the magazine assembly <NUM>, and the second piston <NUM> pushes the firing pin <NUM> to move and drive a nail out. The firing assembly <NUM> further includes an iron sheet <NUM> and a magnet <NUM>. The iron sheet <NUM> is disposed on the side of the second piston <NUM> facing the communication member <NUM>. The magnet <NUM> is disposed on the side of the communication member <NUM> facing the second piston <NUM>. The iron sheet <NUM> and the magnet <NUM> are attracted to each other to fix the second piston <NUM>. In another example, the magnet <NUM> may be disposed on the side of the second piston <NUM> facing the communication member <NUM>, and the iron sheet <NUM> may be disposed on the side of the communication member <NUM> facing the second piston <NUM>.

As shown in <FIG>, the present application provides an example of a cylinder assembly. When the drive rod <NUM> pushes the first piston <NUM> to move from front to rear along the direction of the first axis <NUM> in the first cylinder cavity <NUM>, the gas in the first cylinder cavity <NUM> enters the second cylinder cavity <NUM> through the communication member <NUM>. As the first piston <NUM> gradually approaches the communication member <NUM>, the air pressure borne by the second piston <NUM> also gradually increases. When the air pressure borne by the second piston <NUM> reaches a predetermined threshold, the second piston <NUM> overcomes the attraction of the magnet and moves from rear to front under the action of the air pressure, thereby pushing the firing pin <NUM> to move forward and strike the nail.

The surface of the second cylinder <NUM> may be provided with second cylinder holes <NUM>. When the second piston <NUM> moves forward and crosses the second cylinder holes <NUM> under the push of the air pressure, the gas may leave the second cylinder cavity <NUM> through the second cylinder holes <NUM>. After the second piston <NUM> crosses the second cylinder holes <NUM>, the first piston <NUM> may move from rear to front under the push of the drive rod <NUM>, and at the same time, the second piston <NUM> is driven by the air pressure to move from front to rear. The surface of the first cylinder <NUM> may be provided with first cylinder holes <NUM>. When the first piston <NUM> crosses the first cylinder holes <NUM>, an external gas may enter the first cylinder cavity <NUM> through the first cylinder holes <NUM>. After the external gas enters the first cylinder cavity <NUM>, the first piston <NUM> may move from front to rear in the first cylinder cavity <NUM> under the push of the drive rod <NUM>, and at the same time, the second piston <NUM> is pushed by the air pressure to overcome the attraction of the magnet <NUM> and move from rear to front, thereby pushing the firing pin <NUM> to move forward and strike the nail. With the preceding cycle, the nail gun <NUM> can continuously shoot off the nails.

The cylinder assembly <NUM> in the preceding example implements the flow of the gas in the manner of drilling holes on the surface of the first cylinder <NUM>. In this solution, the holes need to be punched on the formed cylinders. Therefore, the structural strength of the cylinders is reduced, a cost is increased, and the holes may be blocked during the use of the user.

The present application provides multiple technical solutions with which the technical problems of the first cylinder <NUM> in the first example described above can be solved. According to these technical solutions, no hole needs to be punched on the first cylinder <NUM> so that the structural strength of the cylinder is enhanced, the cost for punching the holes is saved, and the possibility is avoided that the holes are blocked.

As shown in <FIG>, as a second example of the cylinder assembly, the combination of a cylinder assembly <NUM> and a firing assembly <NUM> is provided by the present application. For ease of description, in this example, the difference between this example and the preceding example is mainly described, and the same reference numeral is used for a component which is the same as or similar to that in the preceding example. The content of the preceding example which is compatible with this example is applicable to this example.

The cylinder assembly <NUM> is mounted on a mounting base <NUM>, and a firing pin <NUM> is disposed in the cylinder assembly <NUM>. The cylinder assembly <NUM> includes a first cylinder <NUM> and a second cylinder <NUM>. Part of the second cylinder <NUM> is disposed in the first cylinder <NUM>, and the second cylinder <NUM> further includes a protruding portion <NUM> which protrudes from the first cylinder cavity <NUM>. A first accommodating space includes a third accommodating space <NUM> which accommodates the protruding portion <NUM>. The third accommodating space <NUM> is part of the first accommodating space, communicates with the first cylinder cavity <NUM> through a first cylinder opening <NUM>, and can communicate with external air. At least part of a first piston <NUM> may reciprocate in the first cylinder cavity <NUM> and the third accommodating space <NUM>.

An air intake passage <NUM> is disposed in the first piston <NUM>, where an external gas outside the cylinder assembly <NUM> can enter the first cylinder cavity <NUM> through the air intake passage <NUM>. In some examples, the first piston <NUM> may be provided with two or more air intake passages <NUM>, and all of the air intake passages <NUM> may be symmetrically disposed around the second cylinder <NUM>, that is, all of the air intake passages <NUM> may be symmetrically disposed around the second axis.

The air intake passage <NUM> includes an air intake hole <NUM> and an air outlet hole <NUM>. Air intake holes <NUM> are close to the second end <NUM> of the first cylinder <NUM>, and air outlet holes <NUM> are close to the second end <NUM>. As shown in <FIG>, the air intake holes <NUM> are disposed on sidewall surfaces of the first piston <NUM>, where the sidewall surfaces refer to two sidewall surfaces of the first piston <NUM> along a direction perpendicular to the first axis <NUM>. The external gas can enter the air intake passage <NUM> through the air intake hole <NUM>. The gas in the air intake passage <NUM> can leave the air intake passage <NUM> through the air outlet hole <NUM> and enter the first cylinder cavity <NUM>. When the first piston <NUM> reciprocates along the direction of the first axis <NUM> in the first cylinder cavity <NUM>, the air intake hole <NUM> can enter the third accommodating space <NUM>. In this case, the gas in the third accommodating space <NUM> enters the air intake passage <NUM> through the air intake hole <NUM> and enters the first cylinder cavity <NUM> through the air outlet hole <NUM>. When the first piston <NUM> leaves the third accommodating space <NUM> and enters the first cylinder cavity <NUM>, the air intake hole <NUM> can be covered and closed by the inner wall of the first cylinder <NUM>, thereby preventing the gas from entering the air intake passage <NUM> through the air intake hole <NUM>. In some examples, the air intake passage <NUM> is specifically configured to have an L-shaped structure, and the air intake hole <NUM> faces the inner wall of the first cylinder <NUM>, that is, the air intake hole <NUM> faces away from the first axis <NUM> and the air outlet hole <NUM> faces the communication member <NUM>.

In some examples, the inner diameter of the first cylinder <NUM> is <NUM> to <NUM>.

Preferably, the inner diameter of the first cylinder <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In some examples, the length of the first cylinder <NUM> is <NUM> to <NUM>. Preferably, the length of the first cylinder <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In some examples, the inner diameter of the second cylinder <NUM> is <NUM> to <NUM>. Preferably, the inner diameter of the second cylinder <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In some examples, the length of the second cylinder <NUM> is <NUM> to <NUM>. Preferably, the length of the second cylinder <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

As shown in <FIG> and <FIG>, as an optional third example of the cylinder assembly, the combination of a cylinder assembly <NUM> and a firing assembly <NUM> is provided by the present application. For ease of description, in this example, the difference between this example and the preceding example is mainly described, and the same reference numeral is used for a component which is the same as or similar to that in the preceding example. The content of the preceding example which is compatible with this example is applicable to this example.

The cylinder assembly <NUM> includes a first cylinder <NUM>, a second cylinder <NUM>, a communication member <NUM>, and a stopper member <NUM>. The stopper member <NUM> is disposed at a second end <NUM> of the first cylinder <NUM> and can cover part of the first cylinder opening <NUM>, thereby preventing part or all of the first piston <NUM> from leaving the first cylinder cavity <NUM>. The stopper member <NUM> is provided with ventilation holes <NUM> so that a gas in the third accommodating space <NUM> is allowed to be capable of entering the first cylinder cavity <NUM> through the ventilation holes <NUM>.

The first piston <NUM> includes insertion rod sealing members <NUM>. The air intake passage <NUM> further includes fixed slots <NUM>, where a fixed slot <NUM> can accommodate at least part of an insertion rod sealing member <NUM>, and the fixed slots <NUM> are disposed between the air intake hole <NUM> and the air outlet hole <NUM>.

The firing assembly <NUM> further includes insertion members <NUM>, where an insertion member <NUM> can prevent the gas from entering the first cylinder cavity <NUM> from the air outlet hole <NUM>. A first insertion end <NUM> of the insertion member <NUM> is connected to the communication member <NUM>. Specifically, the first insertion end <NUM> may be configured to be inserted into the communication member <NUM>. A second insertion end <NUM> of the insertion member <NUM> can be inserted into the air intake passage <NUM> through the air outlet hole <NUM>, thereby blocking the air intake passage <NUM> to prevent the gas from entering the first cylinder cavity <NUM> from the air outlet hole <NUM>. The insertion member <NUM> further includes an intermediate portion <NUM> disposed between the first insertion end <NUM> and the second insertion end <NUM>. The intermediate portion <NUM> is configured to be capable of fitting closely around the insertion rod sealing member <NUM> to prevent the gas from entering the first cylinder cavity <NUM> through the air intake passage <NUM>.

In some examples, the diameter of the second insertion end <NUM> is less than the diameter of the intermediate portion <NUM>, and the second insertion end <NUM> cannot fit closely around the insertion rod sealing member <NUM> so that the gas is allowed to enter the first cylinder cavity <NUM> through the air intake passage <NUM>. The diameter of the air outlet hole <NUM> may be greater than or equal to the diameter of the intermediate portion <NUM>. When the first piston <NUM> reciprocates along the direction of the first axis <NUM> in the first cylinder cavity <NUM>, the insertion member <NUM> which is fixedly connected to the communication member <NUM> also moves relative to the insertion rod sealing member <NUM>. When the second insertion end <NUM> is inserted into the insertion rod sealing member <NUM>, a gap which allows the gas to pass through can be formed between the second insertion end <NUM> and the insertion rod sealing member <NUM>. When the intermediate portion <NUM> is inserted into the insertion rod sealing member <NUM>, the intermediate portion <NUM> fits closely around the insertion rod sealing member <NUM> so that it is difficult for the gas to pass through.

As shown in <FIG> and <FIG>, as an optional fourth example of the cylinder assembly, the combination of a cylinder assembly <NUM> and a firing assembly <NUM> is provided by the present application. For ease of description, in this example, the difference between this example and the preceding example is mainly described, and the same reference numeral is used for a component which is the same as or similar to that in the preceding example. The content of the preceding example which is compatible with this example is applicable to this example.

The firing assembly <NUM> includes an air valve assembly <NUM> disposed in an air intake passage <NUM>. The air valve assembly <NUM> can allow a gas to enter a first cylinder cavity <NUM> through the air intake passage <NUM> and prevent the gas from entering the first cylinder cavity <NUM> through the air intake passage <NUM>. Specifically, when a first piston <NUM> moves from rear to front to a first preset position (not marked in the figure) along the direction of a first axis <NUM> in the first cylinder cavity <NUM>, the air valve assembly <NUM> is open and allows the gas to enter the first cylinder cavity <NUM> through the air intake passage <NUM>. When the first piston <NUM> moves from a second preset position (not marked in the figure) from front to rear along the direction of the first axis <NUM> in the first cylinder cavity <NUM>, the air valve assembly <NUM> is closed and prevents the gas to enter the first cylinder cavity <NUM> through the air intake passage <NUM>.

In some examples, the air valve assembly <NUM> includes a valve body <NUM>, an elastic member <NUM>, and a switch member <NUM>. The elastic member <NUM> is disposed in the valve body <NUM> and abuts against a first switch end 4573a of the switch member <NUM>. Specifically, the elastic member <NUM> may be a spring. The first switch end 4573a of the switch member <NUM> is disposed in the valve body <NUM>, and a second switch end 4573b of the switch member <NUM> is fixedly connected to the stopper member <NUM>. The valve body <NUM> includes a first opening 4571a and a second opening 4571b, where the first opening 4571a is close to an air intake port <NUM>, and the second opening 4571b is close to an air outlet port <NUM>. The first switch end 4573a can close the first opening 4571a under the pressure of the elastic member <NUM> to prevent the gas from entering the valve body <NUM> through the first opening 4571a.

As shown in <FIG>, as an optional fifth example of the cylinder assembly, the combination of a cylinder assembly <NUM> and a firing assembly <NUM> is provided by the present application. For ease of description, in this example, the difference between this example and the preceding example is mainly described, and the same reference numeral is used for a component which is the same as or similar to that in the preceding example. The content of the preceding example which is compatible with this example is applicable to this example.

The firing assembly <NUM> includes a first sealing member <NUM> and a second sealing member <NUM>. The first sealing member <NUM> surrounds the outer wall of a second cylinder <NUM>, where the outer side of the first sealing member <NUM> fits snugly around a first piston <NUM>, and the inner side of the first sealing member <NUM> fits snugly around part of the outer wall of the second cylinder <NUM>. The first piston <NUM> can drive the first sealing member <NUM> to move on the surface of the outer wall of the second cylinder <NUM>. It is to be understood that the surface of the outer wall for the first piston <NUM> and the first sealing member <NUM> to slide on refers to the cylindrical outer wall of the second cylinder <NUM> along the length direction of the second cylinder <NUM>. The second sealing member <NUM> surrounds the outer wall of the first piston <NUM>, where the inner side of the second sealing member <NUM> fits snugly around the first piston <NUM>, and the outer side of the second sealing member <NUM> is capable of fitting snugly around the inner wall of the first cylinder <NUM>. The first piston <NUM> can drive the second sealing member <NUM> to slide on the surface of the inner wall of the first cylinder <NUM>.

The first piston <NUM> is provided with a first accommodating groove <NUM> and a second accommodating groove <NUM>. The first accommodating groove <NUM> is used for accommodating at least part of the first sealing member <NUM>, and the opening of the first accommodating groove <NUM> faces the inner wall of the first cylinder <NUM>. The second accommodating groove <NUM> is used for accommodating at least part of the second sealing member <NUM>, and the opening of the second accommodating groove <NUM> faces the outer wall of the second cylinder <NUM>.

Slots <NUM> are disposed on part of the surface of the outer wall of the second cylinder <NUM>. When the first piston <NUM> drives the first sealing member <NUM> to move to the position of a slot <NUM>, the first sealing member <NUM> cannot continue fitting closely around the surface of the outer wall of the second cylinder <NUM> due to the existence of the slot <NUM>. Therefore, an air intake passage is formed at the position of the slot <NUM> between the first piston <NUM> and the surface of the outer wall of the second cylinder <NUM>, and a gas can pass through the air intake passage. Distances between the first sealing member <NUM> and the surface of the outer wall of the second cylinder <NUM> are different from each other. When the first sealing member <NUM> moves to the part of the surface of the outer wall, that is, the position of the slot <NUM> in this example, the distance between the first sealing member <NUM> and the surface of the outer wall is greater than <NUM>. When the first sealing member <NUM> moves to part of the surface of the outer wall, that is, the surface of the normal cylindrical outer wall in this example, the distance between the first sealing member <NUM> and the surface of the outer wall is <NUM>. Thus, when the first sealing member <NUM> moves to the part of the surface of the outer wall, the gas can pass through the air intake passage because the distance between the first sealing member <NUM> and the surface of the outer wall is greater than <NUM>. When the first sealing member <NUM> moves to the part of the surface of the outer wall, the air intake passage is closed and the first sealing member <NUM> prevents the gas from passing between the first piston <NUM> and the surface of the outer wall since the distance between the first sealing member <NUM> and the surface of the outer wall is <NUM>.

As shown in <FIG>, when the first sealing member <NUM> is located in the slot <NUM>, a minimum gap between the first piston <NUM> and the surface of the outer wall of the second cylinder <NUM> is S1, and a spacing between the first sealing member <NUM> and the surface of the outer wall of the second cylinder <NUM> is S2. In some examples, S2 is set to be greater than S1 so that it can be ensured that the air intake volume of the cylinder assembly <NUM> meets the requirement of the nail gun for continuously shooting nails.

In some examples, the depth H of the slot <NUM> may be <NUM> to <NUM>. In some examples, at least two slots <NUM> are disposed on part of the surface of the outer wall of the second cylinder <NUM>. All of the slots <NUM> may be symmetrically disposed around the second axis <NUM>.

As shown in <FIG>, as an optional sixth example of the cylinder assembly, the combination of a cylinder assembly <NUM> and a firing assembly <NUM> is provided by the present application. For ease of description, in this example, the difference between this example and the preceding example is mainly described, and the same reference numeral is used for a component which is the same as or similar to that in the preceding example. The content of the preceding example which is compatible with this example is applicable to this example.

In this example, a first cylinder <NUM> includes a first rear cylinder body <NUM> and a first front cylinder body <NUM>, where the inner diameter R2 of the first front cylinder body <NUM> is greater than the inner diameter R1 of the first rear cylinder body <NUM>. The first rear cylinder body <NUM> is located behind the first front cylinder body <NUM>. In another example, the first rear cylinder body <NUM> may be located in front of the first front cylinder body <NUM>.

The first cylinder cavity <NUM> includes the cavity of the first rear cylinder body <NUM> and the cavity of the first front cylinder body <NUM>. Specifically, the outer diameter of the first front cylinder body <NUM> is also greater than the outer diameter of the first rear cylinder body <NUM>, or the maximum inner diameter of the first front cylinder body <NUM> is greater than the minimum inner diameter of the first rear cylinder body <NUM>. In some examples, the first cylinder <NUM> further includes a transition section (not marked in the figure) disposed in the first rear cylinder body <NUM> and the first front cylinder body <NUM>.

When a first piston <NUM> drives a second sealing member <NUM> to move to the cavity of the first rear cylinder body <NUM>, the second sealing member <NUM> fits closely around the surface of the inner wall of the first rear cylinder body <NUM>. When the first piston <NUM> drives the second sealing member <NUM> to move into the cavity of the first front cylinder body <NUM>, the second sealing member <NUM> cannot continue fitting closely around the surface of the inner wall of the first rear cylinder body <NUM>. Therefore, an air intake passage is formed between the first piston <NUM> and the surface of the inner wall of the first rear cylinder body <NUM> or the surface of the inner wall of the first front cylinder body <NUM> in the cavity of the first front cylinder body <NUM>, and a gas can pass through the air intake passage.

As shown in <FIG>, when the second sealing member <NUM> is located in the cavity of the first front cylinder body <NUM>, a gap between the first piston <NUM> and the surface of the inner wall of the first rear cylinder body <NUM> is S3, and a gap distance between the second sealing member <NUM> and the surface of the inner wall of the first front cylinder body <NUM> is S4. In some examples, S4 is set to be greater than S3 so that it can be ensured that the air intake volume of the cylinder assembly <NUM> meets the requirement of the nail gun for continuously shooting nails.

In some examples, the difference between the inner diameter of the first rear cylinder body <NUM> and the inner diameter of the first front cylinder body <NUM> is <NUM> to <NUM>. Preferably, the difference between the inner diameter of the first rear cylinder body <NUM> and the inner diameter of the first front cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>. In some examples, the inner diameter R1 of the first rear cylinder body <NUM> may range from <NUM> to <NUM>. Preferably, the inner diameter R1 of the first rear cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>. In some examples, the inner diameter R2 of the first front cylinder body <NUM> may range from <NUM> to <NUM>. Preferably, the inner diameter R2 of the first front cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>.

In some examples, the difference between the length of the first rear cylinder body <NUM> and the length of the first front cylinder body <NUM> is <NUM> to <NUM>. Preferably, the difference between the length of the first rear cylinder body <NUM> and the length of the first front cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>. In some examples, the length L1 of the first rear cylinder body <NUM> may range from <NUM> to <NUM>. Preferably, the length L1 of the first rear cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>. In some examples, the length L2 of the first front cylinder body <NUM> may range from <NUM> to <NUM>. Preferably, the length L2 of the first front cylinder body <NUM> may be <NUM>, <NUM>, or <NUM>. Optionally, the length L2 of the first front cylinder body <NUM> may be equal to or similar to the length of the first piston <NUM>.

In some examples, the mounting base <NUM> includes an air intake opening <NUM>, and an external gas outside the cylinder assembly <NUM> can enter a first accommodating space <NUM> through the air intake opening <NUM> so that a sufficient air intake volume is provided for the cylinder assembly <NUM>.

In all the preceding examples, all of the sealing members, such as the insertion rod sealing member <NUM>, the first sealing member, and the second sealing member, may be sealing rings. Specifically, all of the sealing members may be O-shaped sealing rings, where the process of an O-shaped sealing ring is mature and the price of the O-shaped sealing ring is low. Alternatively, all of the sealing members, such as the insertion rod sealing member <NUM>, the first sealing member, and the second sealing member, may be X-shaped sealing rings, where an X-shaped sealing ring has excellent sealing performance.

Claim 1:
A nail gun (<NUM>), comprising:
a housing (<NUM>) formed with an accommodating space (<NUM>);
a cylinder assembly (<NUM>) at least partially disposed in the housing;
a magazine assembly (<NUM>) storing nails; and
a firing assembly (<NUM>) for striking a nail and at least partially disposed in the cylinder assembly;
wherein the cylinder assembly comprises a first cylinder (<NUM>) and a second cylinder (<NUM>);
wherein the first cylinder comprises a first cylinder cavity (<NUM>) extending along a direction of a first axis (<NUM>), and at least part of the second cylinder is disposed in the first cylinder cavity; and
the nail gun further comprises a first piston (<NUM>), wherein at least part of the first piston is disposed in the first cylinder cavity, and the first piston is capable of reciprocating along the direction of the first axis in the first cylinder cavity;
characterized in that
the first piston is configured to be capable of forming an air intake passage (<NUM>) with part of an outer wall of the second cylinder, and a gas is capable of passing through the air intake passage and entering the first cylinder cavity.