Fastener driving tool

Abstract

The utility model discloses a fastener driving tool, which belongs to the technical field of electric tools, and comprises an air chamber, a piston, a striking piece, a lifting device, a support cylinder and a movable cylinder body, the movable cylinder body is arranged on the inner circumference of the support cylinder in an up-and-down movable manner, the movable cylinder body and the support cylinder are kept in circumferential sealing fit, the piston is arranged in the movable cylinder body, and the striking piece is arranged in the piston. The air chamber comprises a first air chamber and a second air chamber which are not communicated with each other; the first air chamber is located outside the movable cylinder body, extruded air in the first air chamber drives the movable cylinder body to move downwards relative to the supporting barrel, the piston moving upwards can drive the movable cylinder body to move upwards relative to the supporting barrel, and the movable cylinder body moving upwards extrudes air in the first air chamber; the extruded gas in the second gas chamber can drive the piston to move downwards relative to the movable cylinder body, and the piston moving upwards can extrude the gas in the second gas chamber. Through structural improvement, the nailing effect is guaranteed, and meanwhile the vibration sense of a user is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field especially relates to fastener driving tool. BACKGROUND

[0002] The nail gun is a kind of hand-held driving tool, which drives nails into wood and other workpieces by the rapid movement of the striker. The traditional pneumatic nail gun generally adopts a double-cylinder double-piston structure. After the large piston in the large cylinder moves and compresses the air in the large cylinder to a certain degree, the piston in the small cylinder is released. The compressed air in the large cylinder flows into the small cylinder through the airflow channel and drives the small piston in the small cylinder to move. The moving small piston drives the striker to move synchronously, so that the striker drives nails into wood and other workpieces, thereby achieving the purpose of driving nails. The traditional pneumatic nail gun generally uses a crank connecting rod structure to drive the large piston to move back and forth. Since there is a large force deflection angle in the process of reciprocating motion of the crank connecting rod structure, the crank connecting rod structure is prone to unstable thrust and large unbalanced load when driving the large piston to compress the gas, which leads to the large piston being prone to jamming during the process of compressing the gas.

[0003] The traditional pneumatic nail gun generally uses a crank connecting rod structure to drive the large piston to move back and forth. Since there is a large force deflection angle in the process of reciprocating motion of the crank connecting rod structure, the crank connecting rod structure is prone to unstable thrust and large unbalanced load when driving the large piston to compress the gas, which leads to the large piston being prone to jamming during the process of compressing the gas.

[0004] Based on the above situation, some pneumatic nail guns (such as US11034007B2 and its prior art) use a single-piston single-chamber structure. The gas storage chamber is filled with high-pressure gas. The upward moving piston extrudes the gas in the gas storage chamber. The high-pressure gas in the gas storage chamber can drive the piston to drive the striker to move rapidly, thereby driving nails into the workpiece. Since there is only one gas storage chamber, the gas storage chamber only has one acceleration effect on the piston, which is not conducive to improving the driving nail effect. INVENTION CONTENTS

[0005] In order to solve the above-mentioned shortcomings and deficiencies in the prior art, the utility model provides a kind of fastener driving tool, guarantee driving nail effect while reducing the user's shock.

[0006] In order to realize the above technical purpose, the fastener driving tool provided by the utility model comprises:

[0007] The gas chamber is filled with pressurized gas;

[0008] The piston can move up and down, and the gas extruded in the gas chamber can drive the piston to move downward;

[0009] The upper end of the striker is connected to the piston, and the striker moves downward with the piston to drive the fastener to be hit into the workpiece;

[0010] The fastener driving tool further comprises a support cylinder and a movable cylinder body, wherein,

[0011] The support cylinder is fixedly arranged and extends in the up-down direction,

[0012] The movable cylinder is movably arranged on the inner periphery of the support cylinder, and the movable cylinder is in circumferential sealing cooperation with the support cylinder.

[0013] The gas chamber comprises a first gas chamber and a second gas chamber which are not connected to each other.

[0014] The first gas chamber is located outside the movable cylinder, and the gas in the first gas chamber which is pressed can drive the movable cylinder to move downward relative to the support cylinder.

[0015] The second gas chamber is formed by the movable cylinder and the piston, and the gas in the second gas chamber which is pressed can drive the piston to move downward relative to the movable cylinder.

[0016] Preferably, the movable cylinder has a side wall and a top wall located at the top end of the side wall, and at least part of the first gas chamber is located above the top wall.

[0017] Preferably, the piston, the striking member and the movable cylinder have a preparation position, and the movable cylinder in the preparation position is completely located in the support cylinder.

[0018] Preferably, the piston, the striking member and the movable cylinder have a preparation position, and at least part of the movable cylinder in the preparation position is located above the support cylinder.

[0019] Preferably, a limiting portion adapted to the movable cylinder is arranged above the support cylinder, and the movable cylinder moving to the preparation position can extend out of the support cylinder and enter the limiting portion.

[0020] Preferably, the piston, the striking member and the movable cylinder have an end position, and the upper end of the movable cylinder in the end position is higher than or flush with the upper end of the support cylinder.

[0021] Preferably, the piston, the striking member and the movable cylinder have an end position, and the fastener driving tool further comprises a shock-absorbing block fixed to the lower end of the support cylinder, and the lower end of the movable cylinder in the end position abuts against the shock-absorbing block.

[0022] Preferably, the movable cylinder has a side wall and a top wall located at the top end of the side wall, and the first gas chamber is entirely located at the top of the movable cylinder.

[0023] Preferably, the upper end of the support cylinder is provided with a cylinder cover, and the first gas chamber is formed by the support cylinder, the cylinder cover and the top wall of the movable cylinder.

[0024] Preferably, the outer diameter of the support cylinder is uniform; or, the support cylinder is thick at the top and thin at the bottom and is provided with a stepped portion, and the movable cylinder body is always not higher than the stepped portion.

[0025] Preferably, the lower end of the movable cylinder body is provided with a limiting cap, and the side of the limiting cap facing the movable cylinder body is provided with an elastic block below the piston.

[0026] The utility model also provides a fastener driving tool, which comprises:

[0027] A gas chamber is filled with pressurized gas.

[0028] A piston can move up and down, and the pressurized gas in the gas chamber can drive the piston to move downward.

[0029] A striking member is connected to the piston at the upper end, and the striking member moves downward with the piston to drive the fastener into the workpiece.

[0030] A lifting device is used to drive the piston and the striking member to move upward.

[0031] The fastener driving tool further comprises an inner cylinder, and the upper end of the inner cylinder is provided with a through hole.

[0032] The piston is arranged in the inner cylinder, and the piston and the striking member have an upper preparation position and a lower end position.

[0033] The gas chamber comprises a first gas chamber and a second gas chamber, the first gas chamber is located outside the inner cylinder, and the second gas chamber is formed by cooperation of the inner cylinder and the piston.

[0034] The piston moving from the preparation position to the end position can open the through hole to communicate the first gas chamber and the second gas chamber.

[0035] The piston moving from the end position to the preparation position can close the through hole to separate the first gas chamber and the second gas chamber.

[0036] Preferably, the through hole is provided with a plurality of holes along the circumference of the inner cylinder.

[0037] Preferably, the piston and the inner cylinder have a sealing ring for keeping the circumferential sealing cooperation, and the sealing ring is provided with at least two sealing rings spaced apart from each other, and the through hole is located between the adjacent two sealing rings when the piston is in the preparation position.

[0038] After the above technical scheme is adopted, the utility model has the following advantages:

[0039] 1、In the first scheme, the utility model provides fastener driving tool sets up support cylinder and movable cylinder body, utilizes movable cylinder body to divide gas chamber into first gas chamber and second gas chamber which do not communicate with each other. When driving, high pressure gas in first gas chamber drives movable cylinder body to move downwards relative to support cylinder, high pressure gas in second gas chamber drives striker to move downwards relative to movable cylinder body, utilizes high pressure gas in two gas chambers to make piston accelerate twice when driving, which helps to improve the movement speed of striker, thus helps to improve driving effect. When piston and striker are driven upwards by lifting device, the piston moving upwards can extrude gas in second gas chamber, and can also drive movable cylinder body to move upwards, the movable cylinder body moving upwards can extrude gas in first gas chamber, and the piston moving upwards simultaneously extrudes gas in first gas chamber and second gas chamber. The filled pressurized gas is always located in two gas chambers respectively, which can guarantee the driving strength. In addition, since double gas chamber structure is adopted, the striking vibration caused by the contact between striker and fastener can be buffered twice by gas in two gas chambers, which can greatly reduce the vibration caused by driving while meeting the driving requirement, thus helps to improve the user experience.

[0040] 2、In the second scheme, the utility model provides fastener driving tool sets up through hole in the upper end of inner cylinder body, and the piston can open and close the through hole to make two gas chambers communicate or be cut off. In the process of piston moving from preparation position to end position, high pressure gas in second gas chamber first acts on piston, and after the piston moves downwards to open the through hole, high pressure gas in first gas chamber can flow into second gas chamber through the through hole and simultaneously act on piston, which utilizes two communicable gas chambers to make piston accelerate twice when driving, thus helps to improve the movement speed of striker, thus helps to improve driving effect. In addition, since there are two gas chambers, the striking vibration caused by the contact between striker and fastener can be buffered twice by gas in two gas chambers, which can greatly reduce the vibration caused by driving while meeting the driving requirement, thus helps to improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is the whole machine drawing of fastener driving tool in example one;

[0042] Figure 2 It is the schematic view when fastener is not driven into workpiece in example one;

[0043] Figure 3 It is the schematic view when fastener is driven into workpiece in example one;

[0044] Figure 4 It is the partial structure drawing of fastener driving tool in example one;

[0045] Figure 5 It is the explosion view of partial structure in example one;

[0046] Figure 6 Front and back direction sectional view of the support seat, the guide seat and the hitting member in Example 1;

[0047] Figure 7 Schematic view of the cooperation between the lifting gear and the hitting member in Example 1;

[0048] Figure 8 Axial sectional view of the partial structure in Example 1 when the piston, the hitting member and the movable cylinder are in the preparation position;

[0049] Figure 9 Axial sectional view of the partial structure in Example 1 when the piston, the hitting member and the movable cylinder are in the end position;

[0050] Figure 10 Exploded view of the lifting device in Example 1;

[0051] Figure 11 Schematic view of the cooperation between the partial structure of the lifting device and the lock catch in Example 1;

[0052] Figure 12 Axial sectional view of the partial structure of the lifting device in Example 1;

[0053] Figure 13 Schematic view of the cooperation between the driving wheel and the driven wheel in Example 1;

[0054] Figure 14 Schematic view of the driving wheel in Example 1;

[0055] Figure 15 Schematic view of the cooperation between the cam and the lock catch in Example 1;

[0056] Figure 16 Schematic view of the cooperation between the lock catch and the in-position switch in Example 1;

[0057] Figure 17 Exploded view of the safety assembly and the guide seat in Example 1;

[0058] Figure 18 Axial sectional view of the partial structure in Example 1 when the outer cylinder adopts a special-shaped structure;

[0059] Figure 19 Axial sectional view of the partial structure of the fastener driving tool in Example 2 when the piston, the hitting member and the movable cylinder are in the preparation position;

[0060] Figure 20 Axial sectional view of the partial structure of the fastener driving tool in Example 2 when the piston, the hitting member and the movable cylinder are in the end position;

[0061] Figure 21 Fig. 6 is a schematic view of the support cylinder and the limiting part integrated in the embodiment 2;

[0062] Figure 22 Fig. 7 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 3 when the piston, the striker and the movable cylinder are in the preparation position;

[0063] Figure 23 Fig. 8 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 3 when the piston, the striker and the movable cylinder are in the end position;

[0064] Figure 24 Fig. 9 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 3 when the support cylinder adopts another scheme and the piston, the striker and the movable cylinder are in the preparation position;

[0065] Figure 25 Fig. 10 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 3 when the movable cylinder adopts another scheme and the piston, the striker and the movable cylinder are in the preparation position;

[0066] Figure 26 Fig. 11 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 4 when the piston and the striker are in the preparation position;

[0067] Figure 27 Fig. 12 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 4 when the piston and the striker are in the end position;

[0068] Figure 28 Fig. 13 is an axial sectional view of the partial structure of the fastener driving tool in the embodiment 4 when the inner cylinder adopts another scheme and the piston and the striker are in the preparation position.

[0069] In the drawings, 100-fastener driving tool,

[0070] 10, 10'-air chamber, 10A, 10A'-first air chamber, 10B, 10B'-second air chamber,

[0071] 21-piston, 211-sealing ring, 22-striker, 221-protruding tooth, 222-recess, 23-support cylinder, 231-step part, 24-movable cylinder, 241-side wall, 242-top wall, 243-limiting cover, 244-elastic block, 245-avoidance hole, 25-base, 261-outer cylinder, 262-inner cylinder, 262a-side cylinder wall, 262b-top cylinder wall, 263-through hole, 264-sealing gasket, 27-cylinder cover, 28-damping block, 281-center hole, 291-limiting part, 292-flowing groove,

[0072] 31-fastener, 32-workpiece,

[0073] 40-lifting device, 41-lifting gear, 42-transmission shaft, 43-motor, 44-reduction box, 441-output shaft, 451-driving wheel, 4511-cavity, 452-driven wheel, 461-transmission ratchet groove, 462-transmission ratchet, 463-first spring,

[0074] 50-housing, 51-main body, 52-receiving portion, 53-handle portion, 54-connection portion, 55-reinforcing portion,

[0075] 61-supporting seat, 62-rod shaft, 63-guiding seat, 64-limiting channel, 65-guiding channel, 66-trigger,

[0076] 71-locking block, 72-second spring, 73-cam, 74-in-place switch, 75-pin rod,

[0077] 80-nail feeding device, 81-guiding cover,

[0078] 90-safety assembly, 91-ejector rod, 92-safety switch, 93-third spring, 94-contact piece, 95-positioning frame, 96-elastic member. DETAILED DESCRIPTION

[0079] The utility model will be further described below in combination with the drawings and specific embodiments. It should be understood that the following "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and other words indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device / element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model.

[0080] Example one

[0081] In combination Figures 1 to 17 The fastener driving tool 100 provided by the utility model example one comprises:

[0082] The air chamber 10 is filled with pressurized gas;

[0083] The piston 21 can move up and down, and the pressurized gas in the air chamber 10 can drive the piston 21 to move downward;

[0084] The striker 22 is connected to the piston 21 at the upper end, and the striker 22 following the piston 21 downward movement will drive the fastener 31 to be hit into the workpiece 32;

[0085] The lifting device 40 is used to drive the piston 21 and the striker 22 to move upward;

[0086] The fastener driving tool 100 further comprises a support cylinder 23 and a movable cylinder 24, wherein,

[0087] The support cylinder 23 is fixedly arranged and extends in the up-down direction,

[0088] The movable cylinder 24 is movably arranged in the inner periphery of the support cylinder 23, the movable cylinder 24 is in circumferential sealing cooperation with the support cylinder 23, and the piston 21 is movably arranged in the movable cylinder 24;

[0089] The gas chamber 10 comprises a first gas chamber 10A and a second gas chamber 10B which are not communicated with each other,

[0090] The first gas chamber 10A is located outside the movable cylinder 24, the gas in the first gas chamber 10A which is extruded can drive the movable cylinder 24 to move downward relative to the support cylinder 23, the upward movement of the piston 21 can drive the movable cylinder 24 to move upward relative to the support cylinder 23, and the upward movement of the movable cylinder 24 extrudes the gas in the first gas chamber 10A;

[0091] The second gas chamber 10B is formed by the movable cylinder 24 and the piston 21, and the gas in the second gas chamber 10B which is extruded can drive the piston 21 to move downward relative to the movable cylinder 24, and the upward movement of the piston 21 can extrude the gas in the second gas chamber 10B.

[0092] During driving, the high-pressure gas in the first gas chamber 10A drives the movable cylinder 24 to move downward relative to the support cylinder 23, and the high-pressure gas in the second gas chamber 10B drives the striker 22 to move downward relative to the movable cylinder 24, so that the piston 21 can be accelerated twice by the high-pressure gas in the two gas chambers, which helps to improve the movement speed of the striker 22 and improve the driving effect. Since the double-gas-chamber structure is adopted, the impact shock generated when the striker 22 contacts the fastener 31 can be buffered twice by the gas in the two gas chambers, which can greatly reduce the impact shock caused by driving while meeting the driving requirements, and helps to improve the user experience.

[0093] In the embodiment, the fastener driving tool 100 further comprises a casing 50, which is preferably in a left-right split shell structure, and the casing 50 is formed with a main body portion 51, a receiving portion 52 and a handle portion 53, the main body portion 51 extends in the up-down direction, the receiving portion 52 extends rearward from the lower portion of the main body portion 51 and is used to accommodate part of the components of the lifting device 40, and the handle portion 53 extends rearward from the upper portion of the main body portion 51 and is used for the user to hold, and the handle portion 53 and the receiving portion 52 have a certain gap in the up-down direction. The fastener driving tool 100 of the embodiment is preferably powered by a battery pack, and the battery pack is preferably detachably mounted, and the rear end of the handle portion 53 is formed with a connecting portion 54 for receiving the battery pack.

[0094] The fastener driving tool 100 further comprises a base 25 fixed in the main body 51, a support cylinder 23 having upper and lower end openings, the lower end of the support cylinder 23 being fixed to the base 25 and being in sealing engagement with the base 25, an outer cylinder 261 sleeved on the outer periphery of the support cylinder 23, the lower end of the outer cylinder 261 being fixed to the base 25 and being in sealing engagement with the base 25, and a cylinder cover 27 fixed to the upper end of the outer cylinder 261 and being in sealing engagement with the outer cylinder 261. The movable cylinder 24 comprises a side wall 241 and a top wall 242 at the top end of the side wall 241, the outer periphery of the side wall 241 being sleeved with an axially positioned sealing ring, and the side wall 241 is in circumferential sealing engagement with the support cylinder 23 through the sealing ring. The bottom surface of the cylinder cover 27 is spaced apart from the top surface of the support cylinder 23 by a certain height gap, and the space enclosed by the outer cylinder 261, the support cylinder 23, the base 25, the cylinder cover 27 and the top wall 242 of the movable cylinder 24 is the first gas chamber 10A, and part of the first gas chamber 10A is located above the top wall 242 of the movable cylinder 24, so that the high-pressure gas in the first gas chamber 10A can act on the movable cylinder 24 smoothly. The upper end of the movable cylinder 24 is closed and the lower end is open, and the outer periphery of the piston 21 is also sleeved with an axially positioned sealing ring, and the piston 21 is in circumferential sealing engagement with the movable cylinder 24 through the sealing ring, and the space enclosed by the movable cylinder 24 and the piston 21 is the second gas chamber 10B. The first gas chamber 10A and the second gas chamber 10B are both pre-charged with high-pressure gas, and the gas pressures in the two chambers can be substantially the same or can be different. In order to adjust the gas pressure, two gas charging valves can be provided for charging the two chambers respectively, or two gas exhaust valves can be provided for exhausting the two chambers respectively; of course, a one-way valve for balancing the gas pressures in the two chambers can also be provided on the top wall 242 of the movable cylinder 24 to avoid the gas pressures in the two chambers being too different.

[0095] The lower end of the support cylinder 23 is provided with a damping block 28 located on the inner periphery of the base 25, the damping block 28 being made of elastic material such as rubber, and the damping block 28 can limit the limit position of the downward movement of the movable cylinder 24 and the piston 21, avoiding the movable cylinder 24 from being separated from the support cylinder 23 and the piston 21 from being separated from the movable cylinder 24, and the center of the damping block 28 is provided with a center hole 281 for the striker 22 to pass through.

[0096] In the embodiment, the upper end of the striking member 22 is connected with the piston 21 by screwing or pin hole fitting, etc. The piston 21, the striking member 22 and the movable cylinder 24 have an upper ready position and a lower end position. In normal state, the piston 21, the striking member 22 and the movable cylinder 24 are in the ready position, at this time, the movable cylinder 24 is completely located in the supporting barrel 23, i.e. the top wall 242 of the movable cylinder 24 is lower than or flush with the upper end of the supporting barrel 23, the gas in the first gas chamber 10A and the second gas chamber 10B is in a high pressure state. When driving nails, the piston 21, the striking member 22 and the movable cylinder 24 move from the ready position to the end position, the high pressure gas in the first gas chamber 10A drives the movable cylinder 24 to move downward with the piston 21, the high pressure gas in the second gas chamber 10B drives the piston 21 to move downward relative to the movable cylinder 24. When the movable cylinder 24 and the piston 21 are in contact with the damping block 28, the piston 21, the striking member 22 and the movable cylinder 24 move downward to the end position, at this time, the gas in the first gas chamber 10A and the second gas chamber 10B is in a low pressure state. The upward moving piston 21 extrudes the gas in the second gas chamber 10B, at the same time, the upward moving piston 21 can drive the movable cylinder 24 to move upward, the upward moving movable cylinder 24 extrudes the gas in the first gas chamber 10A. It can be understood that the piston 21 in the end position can also be higher than the damping block 28 without contacting the damping block 28.

[0097] In the embodiment, the striking member 22 is provided with a plurality of protrusions 221 distributed along the up-down direction, the lifting device 40 includes a motor 43, a speed reducer 44 and a lifting gear 41, the lifting gear 41 can engage with the protrusions 221 on the striking member 22 to drive the striking member 22 to move upward to the ready position, the upward moving striking member 22 drives the piston 21 and the movable cylinder 24 to move upward to the ready position at the same time. Specifically, the motor 43 and the speed reducer 44 are arranged in the accommodating portion 52 of the casing 50, the support seat 61 is fixed below the base 25, the lifting gear 41 is sleeved on the transmission shaft 42, the transmission shaft 42 is rotatably arranged on the support seat 61 through a bearing, the axial direction of the lifting device 40 is substantially perpendicular to the length direction of the striking member 22. The output shaft 441 of the speed reducer 44 is sleeved with a driving wheel 451, the rear end of the transmission shaft 42 is sleeved with a driven wheel 452, and a transmission structure capable of being engaged and disengaged is arranged between the driving wheel 451 and the driven wheel 452. When the transmission structure is in the engaged state, the motor 43 drives the driving wheel 451 to rotate through the speed reducer 44, the rotating driving wheel 451 drives the transmission shaft 42 to rotate around its own central axis through the transmission structure, the rotating transmission shaft 42 drives the lifting gear 41 to rotate synchronously in the +ω direction, the lifting gear 41 rotating in the +ω direction drives the striking member 22 to move upward to the ready position through the meshing with the protrusions 221, the upward moving striking member 22 drives the piston 21 and the movable cylinder 24 to move to the ready position.

[0098] Specifically, the driving wheel 451 is provided with a concave cavity 4511 on the side facing the driven wheel 452, and the driven wheel 452 is arranged in the concave cavity 4511. The transmission structure includes a transmission ratchet groove 461 arranged on the cavity wall of the concave cavity 4511, a transmission ratchet 462 swingably arranged on the driven wheel 452, a first spring 463 biasing the transmission ratchet 462 towards the cavity wall of the concave cavity 4511, and a rod shaft 62 arranged on the support seat 61 and used for pushing the transmission ratchet 462 away from the transmission ratchet groove 461. When the transmission ratchet 462 is embedded in the transmission ratchet groove 461 under the biasing action of the first spring 463, the transmission structure is in the engaged state, and the driving wheel 451 driven to rotate by the motor 43 drives the transmission shaft 42 and the lifting gear 41 to rotate in the +ω direction through the cooperation of the transmission ratchet groove 461 and the transmission ratchet 462, so that the lifting gear 41 can drive the striking member 22, the piston 21 and the movable cylinder 24 to move upwards to the preparation position. When the transmission ratchet 462 is pushed away from the transmission ratchet groove 461 by the rod shaft 62 against the biasing of the first spring 463, the transmission structure is in the disengaged state, and the striking member 22 moving downwards during nailing drives the lifting gear 41 to rotate in the direction of -ω, and the lifting gear 41 rotating in the direction of -ω drives the transmission shaft 42 and the driven wheel 452 to rotate freely relative to the driving wheel 451, avoiding reverse rotation transmitted to the speed reducer 44. When it is needed to drive the striking member 22 to return to the preparation position, the rotating driving wheel 451 can make the transmission ratchet 462 re-embedded in the transmission ratchet groove 461.

[0099] In order to lock the striker 22, the piston 21 and the movable cylinder 24 in the normal state, the support base 61 is provided with a slideable lock block 71, the sliding direction of the lock block 71 is substantially perpendicular to the movement direction of the striker 22. Specifically, the lock block 71 is slideable left and right on the support base 61, the lower end of the striker 22 is provided with a groove 222 matched with the lock block 71, and the support base 61 is further provided with a second spring 72 biasing the lock block 71 towards the groove 222. The transmission shaft 42 is sleeved with a cam 73 for unlocking the lock block 71, the cam 73 can be integrally formed with the lifting gear 41, or the cam 73 can be independently formed with respect to the lifting gear 41. In the normal state, the lock block 71 is partially embedded in the groove 222 to keep the striker 22, the piston 21 and the movable cylinder 24 in the standby position. When driving the nails, the motor 43 first drives the lifting gear 41, the transmission shaft 42 and the cam 73 to rotate in the +ω direction, the cam 73 rotating in the +ω direction drives the lock block 71 to slide away from the groove 222 against the bias of the second spring 72, so as to release the striker 22, almost at the same time, the transmission structure is switched from the engaged state to the separated state, the released striker 22 is driven by the piston 21 to move downward quickly, the striker 22 moving downward drives the lifting gear 41, the transmission shaft 42 and the driven wheel 452 to rotate reversely with respect to the driving wheel 451. When the lifting gear 41 drives the striker 22 to move upward to the standby position, the lock block 71 corresponds to the groove 222, the lock block 71 slides towards the groove 222 under the bias of the second spring 72 and is embedded in the groove 222, so as to lock the striker 22 in the standby position.

[0100] In order to make the motor 43 stop in time, the support base 61 is provided with a fixed in-place switch 74, and the lock block 71 is provided with a pin 75 for triggering the in-place switch 74. The main control board is arranged in the casing 50, the in-place switch 74 is signal connected to the main control board, and the motor 43 is controlled by the main control board. The pin 75 releases the in-place switch 74 when the lock block 71 is separated from the groove 222, and the pin 75 triggers the in-place switch 74 when the lock block 71 is re-embedded in the groove 222, and the main control board can command the motor 43 to stop according to the triggering signal of the in-place switch 74.

[0101] The front side of the support base 61 is fixed with a guide base 63, and a limiting channel 64 for the up-down movement of the striking member 22 is formed between the support base 61 and the guide base 63. The fastener driving tool 100 further comprises a nail feeding device 80 detachably attached to the guide base 63, and the front end of the nail feeding device 80 is provided with a guide cover 81. When the nail feeding device 80 is attached to the guide base 63, the guide base 63 cooperates with the guide cover 81 to form a guide channel 65 which is open at both upper and lower ends. The nail feeding device 80 outputs the fastener 31 to be struck into the guide channel 65, and the striking member 22 moving downward enters the guide channel 65 and strikes the fastener 31 to be struck downward into the workpiece 32. The striking member 22 moving upward to the preparation position is separated upward from the guide channel 65, so that the nail feeding device 80 can smoothly output the next fastener 31 to be struck into the guide channel 65. In the embodiment, the fastener 31 struck into the workpiece 32 can be a straight nail, a U-shaped nail or the like.

[0102] The inside of the front end of the handle part 53 is provided with a main switch which is signal connected to the main control board, and the bottom side of the front end of the handle part 53 is provided with a trigger 66 for triggering the main switch. The casing 50 is further provided with a reinforcing part 55 between the accommodating part 52 and the battery connecting part 54, and the main control board can be arranged in the reinforcing part 55.

[0103] The fastener driving tool 100 is further provided with a safety assembly 90, specifically, the safety assembly 90 comprises a top rod 91, a safety switch 92, a third spring 93, a positioning frame 95 and an elastic member 96. The top rod 91 is movably arranged at the front side of the guide base 63 and the movement stroke of the top rod 91 is limited, the upper end of the top rod 91 extends into the main body part 51 and is provided with a contact piece 94 for triggering the safety switch 92, the safety switch 92 can be fixed on the support base 61 or the guide base 63, and is signal connected to the main control board. The third spring 93 biases the top rod 91 downward to release the safety switch 92 in normal state, the positioning frame 95 is fixed on the lower end of the top rod 91, and the elastic member 96 is sleeved on the outside of the positioning frame 95 or arranged on the bottom of the positioning frame 95. When driving nails, the positioning frame 95 is abutted against the workpiece 32, and the positioning frame 95 drives the top rod 91 to move upward against the bias of the third spring 93 to trigger the safety switch 92 by the contact piece 94. Only when both the safety switch 92 and the main switch are triggered, the tool can start the nail driving program, and the triggering sequence of the safety switch 92 and the main switch is not limited. In order to facilitate the adjustment of the nail driving depth, the positioning frame 95 is preferably connected to the lower end of the top rod 91 through screw cooperation.

[0104] When the driving program is started, the rotating cam 73 drives the locking catch 71 to be separated from the groove 222, so that the locking catch 71 releases the striker 22. The high-pressure gas in the first gas chamber 10A acts on the movable cylinder 24 to drive the movable cylinder 24 to move downward relative to the supporting cylinder 23, and the movable cylinder 24 moving downward drives the piston 21 and the striker 22 to move downward. At the same time, the high-pressure gas in the second gas chamber 10B acts on the piston 21 to drive the piston 21 to move downward relative to the movable cylinder 24, and the piston 21 moving downward drives the striker 22 to move downward. The striker 22 moving downward extends into the guide channel 65 to drive the fastener 31 to be driven into the workpiece 32, and the lifting gear 41 rotates in the direction of -ω during the downward movement of the striker 22.

[0105] When the movable cylinder 24, the piston 21 and the striker 22 move to the end position, the lifting gear 41 rotates in the direction of +ω under the drive of the motor 43, and the rotating lifting gear 41 drives the striker 22 and the piston 21 to move upward, the piston 21 moving upward compresses the gas in the second gas chamber 10B and drives the movable cylinder 24 to move upward, and the movable cylinder 24 moving upward compresses the gas in the first gas chamber 10A. When the striker 22 moves to the preparation position, the motor 43 stops.

[0106] As an alternative to the embodiment, in order to control the movement stroke of the striker 22, a magnetic induction switch can also be used instead of the in-place switch 74. Specifically, a magnet is arranged on the striker 22, and two magnetic induction elements are arranged on the supporting seat 61 and / or the guide seat 63 in an up-down distribution, and the magnetic induction elements are signal-connected to the main control board, and the main control board judges the position of the striker 22 according to the triggering condition of the magnetic induction elements. The magnetic induction elements can use Hall elements or reed tubes, etc. When the striker 22 moves to trigger one of the magnetic induction elements, it indicates that the striker 22 moves to the preparation position. When the striker 22 moves to trigger the other magnetic induction element, it indicates that the striker 22 moves to the end position. Of course, the magnet can also be arranged on the lifting gear 41.

[0107] As an alternative to the embodiment, the transmission structure of the lifting device 40 can also use an axial clutch structure, at this time, the driven wheel 452 or the driving wheel 451 can slide in the axial direction. When driving, the driving wheel 451 and the driven wheel 452 are in a separated state, so that the driven wheel 452 can rotate freely relative to the driving wheel 451; after driving, the driving wheel 451 and the driven wheel 452 are restored to the engaged state under the biasing action of the spring.

[0108] As an alternative to the present embodiment, a connecting rod can also be provided between the striking member 22 and the piston 21, the upper end of the striking member 22 being connected to the connecting rod, the upper end of the connecting rod being connected to the piston 21, and the protruding teeth 221 meshing with the lifting gear 41 being provided on the connecting rod. The lifting gear 41 rotating in the +ω direction drives the striking member 22 and the piston 21 upward to the preparation position through the connecting rod.

[0109] In combination Figure 18 As an alternative to the present embodiment, the outer cylinder 261 can be provided in a special-shaped structure other than a columnar shape, at this time, the outer cylinder 261 is located outside the partial support cylinder 23, and the outer cylinder 261 has no fixed relationship with the base 25. The outer cylinder 261 and the support cylinder 23 can be integrally formed or fixed together after being separately formed. Of course, the outer cylinder 261 can also be provided in other reasonable structures.

[0110] As an alternative to the present embodiment, the lifting gear 41 can be provided with a missing tooth portion, that is, the teeth on the lifting gear 41 are not provided in a circumferential continuous manner. When driving nails, the missing tooth portion of the lifting gear 41 faces the striking member 22, and the missing tooth portion is used to avoid the protruding teeth 221 on the striking member 22, so that the striking member 22 can move downward smoothly, and the driving action of the striking member 22 is avoided by the interference of the lifting gear 41. After driving nails, the lifting gear 41 rotating in the +ω direction re-meshes with the protruding teeth 221 to drive the striking member 22 upward to the preparation position. In this scheme, the lifting gear 41 with the missing tooth portion can be directly sleeved on the output shaft 441 of the reduction box 44, and the transmission shaft 42 is cancelled; of course, the lifting gear 41 can still be sleeved on the transmission shaft 42, at this time, a shaft coupling is provided between the transmission shaft 42 and the output shaft 441.

[0111] As an alternative to the present embodiment, the lifting device 40 can also use the driving assembly 400 described in the utility model patent with publication number CN221539660U, at this time, the protruding teeth 221 on the striking member 22 of the present embodiment are not provided, and the rack as the moving member 420 in CN221539660U is provided to be movable up and down relative to the striking member 22 in the present embodiment.

[0112] As an alternative to the present embodiment, the lock catch 71 can also be provided to be pivotable.

[0113] As an alternative to the present embodiment, the setting of the cam 73 can also be cancelled, at this time, the actions of releasing the striking member 22 and locking the striking member 22 are driven by the electromagnetic solenoid, and the electromagnetic solenoid is controlled by the main control board.

[0114] As an alternative of the embodiment, the piston 21, the striking member 22 and the movable cylinder 24 can also be in the end position in the normal state. When the driving cycle is started, the lifting gear 41 first drives the striking member 22, the piston 21 and the movable cylinder 24 to move upward to the preparation position. Then the transmission structure is switched to the separation state, and the high-pressure gas in the two gas chambers drives the piston 21 and the striking member 22 to move downward to the end position. At this time, the lock catch 71, the second spring 72, the cam 73, the in-place switch 74 and the pin rod 75 can be cancelled.

[0115] As a further solution of the embodiment, the tool is provided with a single driving mode and a continuous driving mode, and the tool housing 50 is provided with a mode selection member which can be operated by the user to switch the driving mode of the tool. The mode selection member can be a push block which can slide in two directions, a button which can be pivoted, a knob which can be rotated, a key, a touch screen or other reasonable forms.

[0116] As a further solution of the embodiment, in order to improve the stability of the nail feeding device 80, a quick-release connection structure can be arranged between the rear end of the nail feeding device 80 and the accommodating portion 52 of the tool housing 50.

[0117] Embodiment Two

[0118] In combination Figure 19 , Figure 20 In the embodiment, the axial height of the support cylinder 23 is shortened, and when the movable cylinder 24 is in the preparation position, most of the movable cylinder 24 extends upward out of the support cylinder 23, and the lower end of the movable cylinder 24 is still located in the support cylinder 23. When the movable cylinder 24 is in the end position, the top wall 242 of the movable cylinder 24 is basically flush with the upper end surface of the support cylinder 23, or the top wall 242 of the movable cylinder 24 is slightly higher than the upper end surface of the support cylinder 23.

[0119] In order to ensure the driving effect, the one-way movement stroke of the movable cylinder 24 is equal to or slightly greater than the length of the fastener to be driven.

[0120] In order to avoid the movable cylinder 24 moving upward out of the support cylinder 23, a ring of limiting ribs can be arranged at the upper end of the support cylinder 23 and the lower end of the movable cylinder 24 respectively, and the movable cylinder 24 is axially limited by the upper and lower rings of limiting ribs.

[0121] In combination Figure 21In order to make the movable cylinder 24 move up and down smoothly relative to the support cylinder 23, a limiting part 291 can be arranged above the support cylinder 23, and the position of the movable cylinder 24 extending out of the support cylinder 23 is limited in the radial direction by the limiting part 291. The movable cylinder 24 moving upward to the preparation position enters the limiting part 291 after extending out of the support cylinder 23, and the limiting part 291 also has a certain guiding effect on the movable cylinder 24. The limiting part 291 is arranged at intervals along the outer periphery of the movable cylinder 24, and at least two limiting parts 291 are arranged. Adjacent two limiting parts 291 have a flow-through groove 292 for the gas in the first gas chamber 10A to flow. The cross-sectional shape of the limiting part 291 perpendicular to the axial direction is preferably arc-shaped, and the inner diameter of the limiting part 291 is slightly larger than the outer diameter of the movable cylinder 24. The limiting part 291 can be integrally formed with the support cylinder 23, integrally formed with the cylinder cover 27, or independently formed and then fixed to the top of the support cylinder 23 or the bottom of the cylinder cover 27 or the inside of the outer cylinder body 261.

[0122] The other structures of the second embodiment are the same as those of the first embodiment, which will not be repeated here.

[0123] Embodiment Three

[0124] In combination with Figure 22 , Figure 23 In this embodiment, the first gas chamber 10A is completely located at the top of the movable cylinder 24. Specifically, the outer cylinder body in the first embodiment is cancelled, the support cylinder 23 can be directly fixed on the support seat, the cylinder cover 27 is adapted to the support cylinder 23 and is directly fixed on the top of the support cylinder 23, and the damping block 28 is fixed on the inner periphery of the lower end of the support cylinder 23. The movable cylinder 24 still has a side wall 241 and a top wall 24 located at the top end of the side wall 241, and the movable cylinder 24 is arranged in the support cylinder 23 and the two are in circumferential sealing cooperation. The outer diameter of the support cylinder 23 is consistent from top to bottom, that is, the support cylinder 23 is in the shape of a hollow straight cylinder. The space enclosed by the support cylinder 23, the cylinder cover 27 and the top wall 242 of the movable cylinder 24 forms the first gas chamber 10A, and the space enclosed by the movable cylinder 24 and the piston 21 forms the second gas chamber 10B. The two gas chambers are still not connected to each other, and the two gas chambers can be pre-charged with pressurized gas. In order to adjust the gas pressure in the two gas chambers, a gas charging valve can be arranged on the cylinder cover 27 and the top wall 242 of the movable cylinder 24, and of course an exhaust valve for depressurizing the first gas chamber 10A and the second gas chamber 10B can also be arranged. As a feasible scheme of this embodiment, the support cylinder 23 and the cylinder cover 27 can be integrally formed or separately formed and then fixed together.

[0125] In combination with Figure 22 , the piston 21, the striking member 22 and the movable cylinder 24 are in the preparation position, and the first gas chamber 10A and the second gas chamber 10B are in a high-pressure state.

[0126] When the nail is driven, the high pressure gas in the first gas chamber 10A drives the movable cylinder 24 to move downward relative to the support cylinder 23, and the downward moving movable cylinder 24 simultaneously drives the piston 21 and the striking member 22 to move downward. At the same time, the high pressure gas in the second gas chamber 10B drives the piston 21 to move downward relative to the movable cylinder 24, and the downward moving piston 21 drives the striking member 22 to move downward synchronously, and the downward moving striking member 22 drives the fastener to be driven into the workpiece.

[0127] In combination Figure 23 When the movable cylinder 24, the piston 21 and the striking member 22 move downward to the end position, the movable cylinder 24 and the piston 21 abut against the damping block 28. Of course, when the movable cylinder 24, the piston 21 and the striking member 22 move downward to the end position, the piston 21 can also be higher than the damping block 28 without abutting against the damping block 28.

[0128] When the lifting device drives the striking member 22 to move upward to the preparation position, the striking member 22 drives the piston 21 to move upward synchronously, and the upward moving piston 21 relative to the movable cylinder 24 extrudes the gas in the second gas chamber 10B, and at the same time, the piston 21 drives the movable cylinder 24 to move upward relative to the support cylinder 23, and the upward moving movable cylinder 24 extrudes the gas in the first gas chamber 10A.

[0129] In combination Figure 24 In another scheme of the embodiment, the support cylinder 23 is provided with a stepped portion 231 in which the upper portion is larger in diameter than the lower portion. Since the upper portion of the support cylinder 23 is larger in diameter, the volume of the first gas chamber 10A can be effectively increased, so that the moving speed of the striking member 22 can be increased when the nail is driven, which is beneficial to improve the driving effect. Further, when the movable cylinder 24, the piston 21 and the striking member 22 are in the preparation position, the movable cylinder 24 is not higher than the stepped portion 231, i.e. the top wall 242 of the movable cylinder 24 is slightly lower than or flush with the stepped portion 231, so that the entire first gas chamber 10A is always located at the top of the movable cylinder 24. The upper portion and the lower portion of the support cylinder 23 can be integrally formed or fixed together after being formed in two parts. In order to limit the upward moving stroke of the movable cylinder 24, a convex rib for limiting the movable cylinder 24 can be arranged on the inner wall of the lower portion of the support cylinder 23 or at the stepped portion 231, and the movable cylinder 24 reaches the preparation position when it abuts against the convex rib.

[0130] In combination Figure 25In another scheme of the embodiment, in order to avoid the piston 21 moving downward relative to the movable cylinder 24 from being separated from the movable cylinder 24, the lower end of the movable cylinder 24 is provided with a limiting cover 243, the limiting cover 243 is provided with an elastic block 244 on the top side of the movable cylinder 24, the elastic block 244 is below the piston 21, and the elastic block 244 and the limiting cover 243 are provided with an avoiding hole 245 for the striker 22 to pass through. When the piston 21 moves downward relative to the movable cylinder 24 to abut against the elastic block 24, the piston 21 moves downward relative to the movable cylinder 24 to the limit position. In this scheme, the movable cylinder 24 moving downward to the end position can abut against the limiting cover 243 or slightly higher than the limiting cover 243 without abutting against the limiting cover 243; the piston 21 moving downward to the end position can abut against the elastic block 244 or slightly higher than the elastic block 244 without abutting against the elastic block 244. The limiting cover 243 can be connected to the lower end of the movable cylinder 24 by screwing, screwing and the like, the elastic block 244 can be made of elastic materials such as rubber, and the avoiding hole 245 is gap fitted with the striker 22.

[0131] The other structures of the third embodiment are the same as those of the first embodiment, which will not be described herein.

[0132] Embodiment Four

[0133] In combination Figure 26 , Figure 27 , the fastener driving tool comprises:

[0134] a gas chamber 10' filled with pressurized gas;

[0135] a piston 21 movable upward and downward, the pressurized gas in the gas chamber 10' can drive the piston 21 to move downward;

[0136] a striker 22 connected to the piston 21 at the upper end, the striker 22 moving downward with the piston 21 can drive the fastener to be driven into the workpiece;

[0137] a lifting device for driving the piston 21 and the striker 22 to move upward;

[0138] The fastener driving tool further comprises an inner cylinder 262, and the upper end of the inner cylinder 262 is provided with a through hole 263;

[0139] The piston 21 is arranged in the inner cylinder 262, and the piston 21 and the striker 22 have an upper preparation position and a lower end position;

[0140] The gas chamber 10' comprises a first gas chamber 10A' and a second gas chamber 10B', the first gas chamber 10A' is located outside the inner cylinder 262, and the second gas chamber 10B' is formed at least by the inner cylinder 262 and the piston 21;

[0141] The piston 21 moving from the preparation position to the end position can open the through hole 263 to make the first gas chamber 10A' and the second gas chamber 10B' communicate;

[0142] The piston 21 moving from the end position to the preparation position can close the through hole 263 to make the first gas chamber 10A' and the second gas chamber 10B' isolated.

[0143] When driving the nail, the high-pressure gas in the second gas chamber 10B' first drives the piston 21 and the striker 22 to move downward, when the piston 21 moves to below the through hole 263, the through hole 263 is opened by the piston 21, the first gas chamber 10A' and the second gas chamber 10B' communicate with each other, and the high-pressure gas in the first gas chamber 10A' can flow into the second gas chamber 10B' through the through hole 263 and act on the piston 21 together to make the piston 21 and the striker 22 move downward. By using two communicable gas chambers, the piston 21 can accelerate twice when driving the nail, which helps to increase the movement speed of the striker 22, thereby helping to improve the driving effect. In addition, since there are two gas chambers, the impact shock generated when the striker 22 contacts the fastener can be buffered twice by the gas in the two gas chambers, which can greatly reduce the shock caused by driving the nail while meeting the driving requirements, thereby helping to improve the user experience.

[0144] In one specific scheme of the embodiment, the inner cylinder body 262 includes a side cylinder wall 262a extending in the up-down direction and a top cylinder wall 262b arranged at the top end of the side cylinder wall 262a. Whether the piston 21 is in the preparation position or the end position, there is a certain height difference between the piston 21 and the top cylinder wall 262b, and there is also a certain height difference between the through hole 263 and the top cylinder wall 262b. The space enclosed by the inner cylinder body 262 and the piston 21 forms the second gas chamber 10B', and the space enclosed by the inner cylinder body 262, the outer cylinder body 261, the cylinder cover 27 and the base 25 constitutes the first gas chamber 10A', the volume of the first gas chamber 10A' is always greater than that of the second gas chamber 10B'.

[0145] The outer periphery of the piston 21 is sleeved with a plurality of sealing rings 211 which are distributed at intervals in the up-down direction and are axially positioned, and the sealing rings 211 make the piston 21 and the inner cylinder body 262 keep circumferential sealing cooperation. When the piston 21 is in the preparation position, the through hole 263 is located between two adjacent sealing rings 211 in the axial direction, at this time, the through hole 263 is closed by the piston 21, and the first gas chamber 10A' and the second gas chamber 10B' are isolated from each other.

[0146] During the process that the lifting device drives the striker 22 and the piston 21 to move upward from the ending position to the preparation position, the piston 21 compresses the gas, and when the piston 21 moves to the closed through hole 263, the gas in the two gas chambers is pressed and the gas pressure in the two gas chambers is temporarily consistent because the two gas chambers are communicated through the through hole 263. When the piston 21 moves to the closed through hole 263, the two gas chambers are separated, the piston 21 continues to move a small distance upward and continues to compress the gas in the second gas chamber 10B'. When the piston 21 and the striker 22 move to the preparation position, the piston 21 closes the through hole 263, the second gas chamber 10B' is temporarily not communicated with the first gas chamber 10A', and the gas pressure in the second gas chamber 10B' is higher than that in the first gas chamber 10A'.

[0147] When the through hole 263 is opened by the piston 21, in order to improve the gas flow between the first gas chamber 10A' and the second gas chamber 10B', the through hole 263 is provided with a plurality of holes along the circumference of the inner cylinder body 262.

[0148] In combination Figure 28 In another specific scheme of the embodiment, the upper and lower ends of the inner cylinder body 262 are both open, the upper end of the inner cylinder body 262 extends to be close to the cylinder cover 27, and a sealing gasket 264 is arranged between the upper end surface of the inner cylinder body 262 and the lower surface of the cylinder cover 27 to keep the inner cylinder body 262 and the cylinder cover 27 in sealing cooperation. At this time, the second gas chamber 10B' is formed by the inner cylinder body 262, the cylinder cover 27 and the piston 21, and the first gas chamber 10A' is still formed by the inner cylinder body 262, the outer cylinder body 261, the cylinder cover 27 and the base 25.

[0149] The other structures of the fourth embodiment are the same as those of the first embodiment, which will not be repeated here.

[0150] In addition to the preferred embodiments, the utility model also has other implementation manners, and those skilled in the art can make various changes and deformation according to the utility model, as long as the changes and deformation do not deviate from the spirit of the utility model, and all should belong to the range defined in the utility model claim.

Claims

1. A fastener driving tool, comprising: a gas chamber, the gas chamber being filled with pressurized gas; a piston, the piston being movable up and down, the pressurized gas in the gas chamber being capable of driving the piston to move downward; a striker, the striker being connected to the piston at an upper end of the striker, the striker following the piston to move downward to drive a fastener to be driven into a workpiece; a lifting device, the lifting device being capable of driving the piston and the striker to move upward; characterized in that the fastener driving tool further comprises a support cylinder and a movable cylinder body, wherein: the support cylinder is fixedly arranged and extends in an up-down direction; the movable cylinder body is movably arranged in an inner periphery of the support cylinder, the movable cylinder body being in circumferential sealing engagement with the support cylinder, and the piston is movably arranged in the movable cylinder body; the gas chamber comprises a first gas chamber and a second gas chamber, the first gas chamber and the second gas chamber being not in communication with each other, wherein: the first gas chamber is located outside the movable cylinder body, the pressurized gas in the first gas chamber being capable of driving the movable cylinder body to move downward relative to the support cylinder, the piston moving upward being capable of driving the movable cylinder body to move upward relative to the support cylinder, and the movable cylinder body moving upward being capable of pressing the gas in the first gas chamber; the second gas chamber is formed by the movable cylinder body and the piston, the pressurized gas in the second gas chamber being capable of driving the piston to move downward relative to the movable cylinder body, and the piston moving upward being capable of pressing the gas in the second gas chamber.

2. The fastener driving tool according to claim 1, wherein The movable cylinder body has a side wall and a top wall located at a top end of the side wall, and at least a portion of the first gas chamber is located above the top wall.

3. The fastener driving tool of claim 1, wherein The piston, the striker and the movable cylinder body have a preparation position, and the movable cylinder body in the preparation position is completely located in the support cylinder.

4. The fastener driving tool of claim 1 wherein, The piston, the striker and the movable cylinder body have a preparation position, and at least a portion of the movable cylinder body in the preparation position is located above the support cylinder.

5. The fastener driving tool of claim 4, wherein The support cylinder is provided with a limiting portion matched with the movable cylinder body above the support cylinder, and the movable cylinder body moving to the preparation position is capable of extending out of the support cylinder and into the limiting portion.

6. The fastener-driving tool of claim 4, wherein The piston, the striker and the movable cylinder body have an end position, and an upper end of the movable cylinder body in the end position is higher than or flush with an upper end of the support cylinder.

7. The fastener driving tool according to claim 3 or 4, wherein The piston, the striker and the movable cylinder body have an end position, and the fastener driving tool further comprises a damping block fixed to a lower end of the support cylinder, and a lower end of the movable cylinder body in the end position abuts against the damping block.

8. The fastener-driving tool of claim 1, wherein The movable cylinder body has a side wall and a top wall located at a top end of the side wall, and the first gas chamber is entirely located at a top of the movable cylinder body.

9. The fastener-driving tool of claim 8, wherein An upper end of the support cylinder is provided with a cylinder cover, and the first gas chamber is formed by the support cylinder, the cylinder cover and the top wall of the movable cylinder body.

10. The fastener-driving tool of claim 9, wherein An outer diameter of the support cylinder is consistent in an up-down direction, or the support cylinder is thick at an upper end and thin at a lower end and is provided with a stepped portion, and the movable cylinder body is always not higher than the stepped portion.

11. The fastener-driving tool of claim 8, wherein A lower end of the movable cylinder body is provided with a limiting cover, the limiting cover is provided with an elastic block below the piston at a side facing the movable cylinder body, and the elastic block and the limiting cover are both provided with avoiding holes for the striker to pass through.

12. A fastener driving tool, comprising: a gas chamber, the gas chamber being filled with pressurized gas; a piston, the piston being movable up and down, the pressurized gas in the gas chamber being capable of driving the piston to move downward; a striker, the striker being connected to the piston at an upper end of the striker, the striker following the piston to move downward to drive a fastener to be driven into a workpiece; a lifting device, the lifting device being capable of driving the piston and the striker to move upward; characterized in that the fastener driving tool further comprises an inner cylinder body, and an upper end of the inner cylinder body is provided with a through hole. The piston is arranged in the inner cylinder body, and the piston and the striking member have an upper preparation position and a lower end position; The air chamber comprises a first air chamber and a second air chamber, the first air chamber is located outside the inner cylinder body, and the second air chamber is formed by cooperation of the inner cylinder body and the piston; The piston moving from the preparation position to the end position can open the through hole to communicate the first air chamber and the second air chamber; The piston moving from the end position to the preparation position can close the through hole to separate the first air chamber and the second air chamber.

13. The fastener-driving tool of claim 12, wherein A plurality of through holes are arranged along the circumference of the inner cylinder body.

14. The fastener-driving tool of claim 12, wherein The piston and the inner cylinder body are provided with a sealing ring for keeping a circumferential sealing cooperation, and at least two sealing rings are arranged in the upper and lower positions of the sealing ring, and the through hole is located between the adjacent two sealing rings when the piston is in the preparation position.

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