Driving tool

Abstract

To provide a driving tool which has smaller reaction at the time of driving.SOLUTION: A driving tool 10 includes a driver 1e which strikes a driving implement. A piston 1d is connected to the driver 1e. Gas pressure of a cylinder 1c is generated by the piston 1d. The cylinder 1c is made of iron. The cylinder 1c is positioned along a moving axis J1 of the piston 1d or in the vicinity of the moving axis J1 of the piston 1d. Since the cylinder 1c is made of iron, weight along the moving axis J1 of the piston 1d is larger than that in a case that the cylinder 1c is made of aluminum or resin. Reaction against movement of the piston 1d or striking of the driver 1e is suppressed because of the weight in the vicinity of the moving axis J1 of the piston 1d.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a driving tool for driving driving tools such as nails and staples into wood or the like.

Background Art

[0002] The driving tool of Patent Document 1 has a piston that moves up and down in a cylinder and a driver that is integrally coupled to the piston. The piston and the driver move in the driving direction by the gas pressure in the accumulator chamber. The moved driver strikes the driving tool to eject the driving tool. In this driving operation, a reaction force is generated in the tool body both when the piston moves in the driving direction and when the driver strikes the driving tool.

[0003] The reaction force acts in the reverse driving direction. Due to this reaction force, a force is generated to rotate the tool body around the grip held by the user. The recoil that occurs each time the driving tool is driven becomes a burden on the user. In some cases, the recoil causes the posture of the driving tool to wobble. As a result, there is a concern that the driving tool may come off from the striking surface of the driver or the ejection port may float from the material to be driven, making it impossible to properly drive the driving tool.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, there has been a need for a driving tool with less recoil during driving.

Means for Solving the Problems

[0006] According to one aspect of the present disclosure, a driving tool has a driver that strikes a driving implement. A piston is connected to the driver. A cylinder generates gas pressure by the piston. The cylinder is made of iron. Therefore, the cylinder is located on or near the movement axis of the piston. And since the cylinder is made of iron, the weight on the movement axis of the piston is greater than when the cylinder is made of aluminum or resin. Therefore, the movement of the piston and the reaction to the strike of the driver can be suppressed by the weight near the movement axis of the piston. As a result, the reaction during driving is reduced.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0008] According to another aspect of the present disclosure, the cylinder has an inner peripheral surface that slidably holds the piston. The inner peripheral surface is not surface-treated. Since the cylinder is made of iron, the strength of the inner peripheral surface can be ensured without surface treatment. Thereby, the labor of surface treatment can be saved.

[0009] According to another aspect of the present disclosure, the cylinder is heat-treated. Thereby, the strength of the cylinder can be further increased.

[0010] According to another aspect of the present disclosure, the driving tool has a driver that strikes the driving implement. A piston is connected to the driver. A cylinder generates gas pressure by the piston. A housing accommodates the cylinder. The housing is cylindrical and extends along the vertical direction. A weight is provided inside the housing. Therefore, the housing is located near the movement axis of the piston. The weight increases the weight of the housing. Thus, the movement of the piston and the reaction to the strike of the driver can be suppressed by the weight near the movement axis of the piston. Thereby, the reaction during driving becomes smaller.

[0011] According to another aspect of the present disclosure, the weight is arranged around the cylinder. The weight is arranged at vertical positions corresponding to the range of the length of the cylinder. Therefore, the weight can be surely arranged near the movement axis of the piston. Thus, the weight can more effectively suppress the reaction during driving.

[0012] According to another aspect of the present disclosure, the weight is fixed to the inner wall of the housing. Therefore, the weight is integrally attached to the housing. Thereby, the weight does not rattle inside the housing.

[0013] According to another aspect of the present disclosure, a grip extends rearward from the housing. The weight is arranged such that the center of gravity of the weight is located on the front side of the front-rear center of the housing. Therefore, the weight is provided such that the weight on the side opposite to the grip is greater when viewed from the housing. Thereby, it becomes easier to maintain the balance of the weight in the front-rear direction. As a result, the front-rear wobbling due to the reaction during driving can be reduced.

[0014] According to another aspect of the present disclosure, the grip extends rearward of the housing. The lifter moves the driver upward. The lifter is located on a first side, either left or right, from the left - right center of the grip. The weight is arranged such that the center of gravity of the weight is located on a second side opposite to the first side across the left - right center of the grip. The weight is provided so that the weight on the side opposite to the side where the lifter is located is greater. As a result, it becomes easier to maintain the balance of the weight in the left - right direction around the grip. Consequently, the lateral wobbling due to the recoil during driving can be reduced.

[0015] Next, one embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the driving tool 10 is, for example, a gas - spring type that drives a driving tool using gas pressure. In the following description, the driving direction of the driving tool is defined as the downward direction, and the counter - driving direction is defined as the upward direction. The user holds the driving tool 10 by hand and is located on the left side in FIG. 1. The front side of the user's hand is defined as the rear direction (user side), and the back side is defined as the front direction. The left - right direction is defined with reference to the user.

[0016] As shown in FIG. 1, the driving tool 10 has a tool body 11. The tool body 11 has a generally cylindrical housing 1. At the rear of the upper part 1a of the housing, a grip 12 for the user to hold is provided. The grip 12 is substantially cylindrical. The grip 12 extends rearward. At the rear of the grip 12, a battery attachment portion 15 is provided. A battery pack 16 can be detachably attached to the rear surface of the battery attachment portion 15. The battery pack 16 is attached by a sliding operation obliquely downward to the rear along the rear surface of the battery attachment portion 15. The battery pack 16 can be repeatedly charged with a charger separately prepared after being removed from the battery attachment portion 15 and used. The battery pack 16 can be diverted as a power source for other power tools. The battery pack 16 operates as a power source for supplying power to a drive unit 4 described later.

[0017] As shown in Fig. 2, the battery attachment portion 15 is a box-shaped member extending vertically. Inside the battery attachment portion 15, a controller 14 is provided. On the lower front surface of the battery attachment portion 15, a substantially cylindrical drive unit case 17 is integrally connected. The drive unit case 17 extends in the front-rear direction. The front portion of the drive unit case 17 is integrally connected to the rear portion of the lower housing 1b. Inside the drive unit case 17, a drive unit 4 is accommodated. The drive unit 4 has a motor 4a as a drive source and a reduction gear train 4b connected to the motor 4a. The motor 4a is accommodated so that its axis (motor axis J3) is directed in the front-rear direction.

[0018] As shown in Fig. 2, on the lower front surface of the front portion of the grip 12, a trigger 13 is provided which the user pulls with their fingertips to operate. Inside the grip 12 located above the trigger 13, a switch 19 is provided. By pulling the trigger 13, the switch 19 is pushed upward to be in the on state. The on-state switch 19 sends a signal to the controller 14. The controller 14 operates the motor 4a based on the sent signal. The rotational output of the motor 4a is reduced by the reduction gear train 4b and output to the front lifter 3.

[0019] As shown in Fig. 2, the upper housing 1a houses an iron cylinder 1c. As shown in Fig. 3, the cylinder 1c slidably holds a piston 1d inside it. The piston 1d can move up and down inside the cylinder 1c. The cylinder 1c is heat-treated. As a result, the cylinder 1c is less likely to wear due to the movement of the piston 1d and can also ensure strength. Therefore, it is not necessary to perform the surface treatment required in the case of an aluminum inner peripheral surface 1j of the cylinder 1c.

[0020] As shown in FIG. 3, the upper part of the cylinder 1c above the piston 1d communicates with the accumulator chamber 1f. Compressed gas such as air is enclosed in the accumulator chamber 1f. The gas pressure in the accumulator chamber 1f acts as a thrust force to move the piston 1d downward (forward in the driving direction). A vertically long driver 1e is coupled to the lower surface of the piston 1d. The driver 1e has a plurality of engaged portions L. Each engaged portion L is provided in a state of protruding rightward from the right side portion of the driver 1e. Each engaged portion L is formed in a rack tooth shape. Specifically, seven engaged portions L are arranged at regular intervals in the longitudinal direction (vertical direction) of the driver 1e.

[0021] As shown in FIG. 2, the lower part of the housing 1b houses the lower case 1h. As shown in FIG. 3, the lower case 1h is connected to the lower part of the cylinder 1c. The lower case 1h covers a part of the lower surface of the cylinder 1c from below. A damper 1g is provided on the connection surface of the lower case 1h with the cylinder 1c. The damper 1g is disposed inside the cylinder 1c below. The damper 1g is made of an elastic body.

[0022] As shown in FIG. 3, the lower case 1h houses the lifter 3. The lifter 3 is located at the lower right of the cylinder 1c. The lifter 3 has a rotating shaft 3b connected to the driving part 4 (see FIG. 2) and a wheel 3a supported by the rotating shaft 3b. The rotating shaft 3b is rotatably supported with respect to the lower case 1h by a bearing (not shown). The axis line of the rotating shaft 3b coincides with the motor axis line J3 (see FIG. 2). When the driving part 4 operates, the rotating shaft 3b and the wheel 3a rotate integrally in the direction of arrow R (counterclockwise direction in FIG. 3). The rotation of the wheel 3a in the direction opposite to arrow R is restricted. The lifter 3 has a plurality of engaging portions P provided along the outer peripheral edge of the wheel 3a. A cylindrical shaft member (pin) is used for each engaging portion P. Each engaging portion P extends in the front-rear direction. Seven engaging portions P are provided in a region of about 3 / 4 of the circumference in the circumferential direction on the wheel 3a. The remaining 1 / 4 of the circumferential region is a release region where the engaging portions P are not arranged.

[0023] Figure 3 shows the state where the driver 1e is set at the standby position before performing the driving operation. As shown in Figure 3, one engaged portion L engages with one engaging portion P. Specifically, the lower end rack L1 located at the lowest position among the engaged portions L engages with the rear end pin P1 located at the rear end in the rotation direction of the wheel 3a among the engaging portions P. The rear end pin P1 engages with the lower end rack L1 from below. Due to the engagement of the rear end pin P1 and the restriction of the clockwise rotation of the wheel 3a, the lifter 3 supports the driver 1e from below. Thereby, the driver 1e and the piston 1d are held at the standby position against the gas pressure in the accumulator chamber 1f.

[0024] As shown in Figure 3, the lower part of the driver 1e at the standby position enters the nose portion 2. The nose portion 2 is a metal member extending in the vertical direction. The nose portion 2 is formed of iron. The upper part of the nose portion 2 is housed in the lower housing 1b. The upper part of the nose portion 2 is assembled with the lower case 1h. The lower part of the nose portion 2 protrudes downward from the lower housing 1b. The nose portion 2 has a driving passage 2a extending in the vertical direction inside thereof. The driving passage 2a passes on the moving axis J1 of the piston 1d. The lower part of the driver 1e enters the driving passage 2a. A driving tool (not shown) is loaded into the driving passage 2a below the driver 1e.

[0025] As shown in Figure 2, the rear part of the nose portion 2 is coupled to a magazine 18 loaded with a number of driving tools. The driving tools are supplied one by one in a posture extending vertically from the magazine 18 into the driving passage 2a. The magazine 18 extends in a direction toward the left and upward toward the rear of the tool body 11. A contact arm 2c that can slide vertically is provided at the lower part of the nose portion 2. The contact arm 2c is biased to move downward relative to the nose portion 2 (off position). When the contact arm 2c moves upward relative to the nose portion 2, the pulling operation of the trigger 13 becomes effective (on position).

[0026] When using the driving tool 10, first, the user grips the grip 12 in the orientation shown in FIG. 2. Then, the user presses the contact arm 2c against the material to be driven from above. As a result, the contact arm 2c moves upward relative to the nose portion 2. In this state, when the user pulls the trigger 13, the controller 14 rotates the motor 4a of the drive unit 4. Thus, the rotation of the motor 4a is transmitted to the lifter 3 via the reduction gear train 4b. And as shown in FIG. 3, the rotating shaft 3b rotates in the direction of arrow R. Thereby, the wheel 3a rotates in the direction of arrow R. Due to the rotation of the wheel 3a, the rear end pin P1 gets over the lower end rack L1. Thereby, the engagement between the rear end pin P1 and the lower end rack L1 is released. As a result, the piston 1d moves downward by the gas pressure in the accumulator chamber 1f. Along with the downward movement of the piston 1d, the driver 1e also moves downward. The driver 1e is guided in the driving passage 2a. The driver 1e moves downward along the movement axis J1 of the piston 1d.

[0027] The lower end of the downward-moved driver 1e strikes one driving tool loaded in the driving passage 2a. The struck driving tool is ejected from the ejection port 2b provided at the lower end of the nose portion 2. The ejected driving tool is driven into the material to be driven. The downward-moved piston 1d collides with the damper 1g. Thereby, the downward movement of the piston 1d and the driver 1e stops. The damper 1g absorbs the impact at the time of the collision of the piston 1d. By the damper 1g, the breakage of the piston 1d is prevented.

[0028] Even after the downward movement of the piston 1d stops, the wheel 3a continues to rotate in the direction of arrow R. Thereby, the engaging portion P located at the front end in the rotation direction of the wheel 3a engages with the engaged portion L located at the uppermost position from below. And as the wheel 3a continues to rotate, the engaging portion P pushes up the engaged portion L upward. Along with the rotation of the wheel 3a, each engaging portion P pushes up each engaged portion L in order. In this way, the lifter 3 pushes back the driver 1e and the piston 1d to the standby position.

[0029] In the above-described driving operation, when the piston 1d moves downward and when the driver 1e strikes the driving tool, a reaction force is generated on the tool body 11. The reaction force acts in the upward direction (the counter-driving direction) along the moving axis J1 of the piston 1d (see FIG. 2). Therefore, a reaction occurs that attempts to rotate the driving tool 10 in the rearward and upward direction with the grip 12 held by the user as the center of rotation.

[0030] However, in this embodiment, the cylinder 1c is formed of iron. Therefore, the weight of the cylinder 1c is greater than that of a configuration in which the cylinder 1c is made of aluminum or resin. Therefore, the cylinder 1c can cancel out the reaction force acting in the upward direction. As a result, the recoil during driving can be reduced. Further, the cylinder 1c can be balanced in weight with the battery pack 16 located behind the grip 12. Thereby, it becomes easier to maintain the balance of the weight in the front-rear direction. As a result, it becomes easier to suppress the front-rear wobbling due to the recoil during driving.

[0031] In addition, since the cylinder 1c becomes heavier, the total weight of the components housed in the upper housing 1a can be made closer to the total weight of the components housed in the lower housing 1b. Thereby, the center of gravity of the tool body 11 can be brought closer to the grip 12. As a result, the operability when the user moves the driving tool 10 is improved. Also, for example, when using the driving tool 10 with the moving axis J1 oriented in the horizontal direction, it becomes easier to balance the weight of the driving tool 10 in the driving direction.

[0032] As described above, as shown in FIG. 3, the driving tool 10 has a driver 1e that strikes the driving tool. A piston 1d is connected to the driver 1e. A cylinder 1c generates gas pressure by the piston 1d. The cylinder 1c is made of iron. Therefore, the cylinder 1c is located on or near the movement axis J1 of the piston 1d. And since the cylinder 1c is made of iron, the weight of the movement axis J1 of the piston 1d becomes larger compared to the case where the cylinder 1c is made of aluminum or resin. Therefore, the movement of the piston 1d and the reaction to the strike of the driver 1e can be suppressed by the weight on or near the movement axis J1 of the piston 1d. As a result, the reaction during driving becomes smaller.

[0033] As shown in FIG. 3, the cylinder 1c has an inner peripheral surface 1j that slidably holds the piston 1d. The inner peripheral surface 1j is not surface-treated. Since the cylinder 1c is made of iron, the strength of the inner peripheral surface 1j can be ensured without surface treatment. Thereby, the labor of surface treatment can be saved.

[0034] As shown in FIG. 3, the cylinder 1c is heat-treated. Thereby, the strength of the cylinder 1c can be further enhanced.

[0035] Next, a second embodiment of the present disclosure will be described with reference to FIGS. 4 to 7. The driving tool 20 of the second embodiment has a housing 21 instead of the housing 1 according to the first embodiment. The housing 21 has a housing upper part 21a and a cylinder 21c. The driving tool 20 also has a weight 5. In the following description, only the parts different from the first embodiment will be described in detail.

[0036] As shown in FIGS. 4 and 5, the cylinder 21c is housed in the housing upper part 21a. The cylinder 21c is made of aluminum. The inner peripheral surface of the cylinder 21c is surface-treated such as hard anodizing treatment. Thereby, the strength and wear resistance of the cylinder 21c are improved.

[0037] As shown in FIGS. 4 and 5, the driving tool 20 has a weight 5 provided inside the upper housing 21a. The weight 5 is made of iron. The weight 5 increases the weight in the vicinity of the movement axis J1 of the piston 1d. The weight 5 is disposed on the front side and the left side of the cylinder 21c. The weight 5 is disposed so as to be within the vertical length range of the cylinder 21c.

[0038] As shown in FIG. 6, the weight 5 is a metal member formed by bending a single sheet of sheet metal into a substantially L-shaped cross section. The weight 5 has a front portion 5a, a left portion 5b, and a curved portion 5c. The front portion 5a, the left portion 5b, and the curved portion 5c are formed continuously. The curved portion 5c connects the central portion in the vertical direction on the left side of the front portion 5a and the central portion in the vertical direction on the front side of the left portion 5b. The weight 5 also has an upper extension portion 5d and a lower extension portion 5g that extend leftward from the front portion 5a. The upper extension portion 5d is located above the curved portion 5c. An upper groove portion 5e is provided between the upper extension portion 5d and the curved portion 5c. The lower extension portion 5g is located below the curved portion 5c. A lower groove portion 5h is provided between the lower extension portion 5g and the curved portion 5c. The weight 5 also has a front protrusion portion 5f that protrudes forward from the right side portion of the front portion 5a.

[0039] As shown in FIG. 7, the housing 21 has a first rib 21k that protrudes rightward from the inner wall on the left side thereof. The first rib 21k has a recess 21m that is recessed leftward. The lower extension portion 5g of the weight 5 is fitted into the recess 21m. The upper extension portion 5d of the weight 5 is also fitted into the recess 21m. Thereby, the weight 5 is positioned with respect to the housing 21. The housing 21 also has a second rib 21n that protrudes from the inner wall on the front side thereof. The second rib 21n supports the front protrusion portion 5f of the weight 5 from the right side. Thereby, the weight 5 is prevented from coming off so as not to come out of the recess 21m. As described above, the weight 5 is fixed inside the housing 21.

[0040] As shown in Fig. 7, the weight 5 has a greater weight on the front side than on the rear side when viewed from the center in the front-rear direction (front-rear center J4) of the housing 21. That is, the center of gravity 5p of the weight 5 is located on the front side of the front-rear center J4 of the housing 21. As a result, the weight 5 can balance with components located behind the housing 21 such as the grip 12. Therefore, it is easier to balance the weight in the front-rear direction with respect to the housing 21. As a result, the operability of the driving tool 20 can be improved. Also, it is easier to suppress the front-rear wobbling due to the recoil during driving.

[0041] Also, the weight 5 has a greater weight on the left side than on the right side when viewed from the center in the left-right direction (left-right center J2) of the grip 12. That is, the center of gravity 5p of the weight 5 is located on the left side of the left-right center J2 of the grip 12. As a result, the weight 5 can balance with components located on the right side of the grip 12 such as the lifter 3 and the drive unit 4. Therefore, it is easier to balance the weight in the left-right direction with respect to the grip 12. As a result, the operability of the driving tool 20 can be improved. Also, it is easier to suppress the left-right wobbling due to the recoil during driving.

[0042] As described above, as shown in Fig. 4, the driving tool 20 has a driver 1e that strikes the driving tool. The piston 1d is connected to the driver 1e. The cylinder 21c generates gas pressure by the piston 1d. The housing 21 houses the cylinder 21c. The housing 21 is in a cylindrical shape extending along the vertical direction. The weight 5 is provided inside the housing 21. Therefore, the housing 21 is located near the movement axis J1 of the piston 1d. The weight of the housing 21 is increased by the weight 5. Therefore, the movement of the piston 1d and the recoil against the strike of the driver 1e can be suppressed by the weight near the movement axis J1 of the piston 1d. Thereby, the recoil during driving is reduced.

[0043] As shown in FIGS. 4 and 5, the weight 5 is disposed around the cylinder 21c. The weight 5 is disposed at upper and lower positions corresponding to the range of the length of the cylinder 21c. Therefore, the weight 5 can be surely disposed near the movement axis J1 of the piston 1d. Thus, the recoil at the time of driving can be more suppressed by the weight 5.

[0044] As shown in FIGS. 7 and 8, the weight 5 is fixed to the inner wall of the housing 21. Therefore, the weight 5 is integrally attached to the housing 21. Thereby, the weight 5 does not rattle inside the housing 21.

[0045] As shown in FIG. 7, the grip 12 extends rearward from the housing 21. The weight 5 is disposed such that the center of gravity 5p of the weight 5 is positioned on the front side of the front-rear center J4 of the housing 21. Therefore, the weight 5 is provided such that the weight on the side opposite to the grip 12 is larger when viewed from the housing 21. Thereby, it becomes easier to maintain the balance of the weight in the front-rear direction. As a result, the blur in the front-rear direction due to the recoil at the time of driving can be reduced.

[0046] As shown in FIG. 7, the grip 12 extends rearward from the housing 21. The lifter 3 moves the driver 1e upward. The lifter 3 is positioned on either the left or right first side from the left-right center J2 of the grip 12. The weight 5 is disposed such that the center of gravity 5p of the weight 5 is positioned on the second side opposite to the first side with the left-right center J2 of the grip 12 interposed therebetween. The weight 5 is provided such that the weight on the side opposite to the first side where the lifter 3 is positioned is larger. Thereby, it becomes easier to maintain the balance of the weight in the left-right direction around the grip 12. As a result, the blur in the left-right direction due to the recoil at the time of driving can be reduced.

[0047] Various modifications can be made to the embodiments described above. For example, a configuration in which heat treatment is applied to an iron cylinder is illustrated. In addition to this, the inner peripheral surface of the iron cylinder may be polished. Thereby, wear of the inner peripheral surface can be further suppressed.

[0048] As a configuration for increasing the weight near the moving axis of the piston, in the first embodiment, a configuration in which an iron cylinder is provided was exemplified. In the second embodiment, a configuration in which weights are provided around an aluminum cylinder was exemplified. Instead of these, weights may be provided around the iron cylinder.

[0049] The number, shape, size, etc. of the weights are not limited to the exemplified weight 5 and may be changed as appropriate. In the second embodiment, a configuration in which weights are provided on the front side and the left side of the cylinder was exemplified. Instead of this, the weights may be provided around the entire circumference of the cylinder. Alternatively, the weights may be arbitrarily provided around the cylinder. If the weights are configured to be provided within the housing, they may be provided around or inside the lower case, or around the nose portion. The weights may be made of metals such as brass, copper, aluminum, etc. in addition to iron.

[0050] A configuration in which the weight is inserted into a groove provided on the inner wall of the cylinder was exemplified. Instead of this, the weight may be configured to be hooked and fixed to a claw provided on the inner wall. Also, the weight may be configured to be adhered to the inner wall of the housing.

[0051] The lifter may be located to the left of the center of the left and right of the grip. In that case, a configuration in which the center of gravity of the weight is located to the right of the center of the left and right is desirable.

[0052] The driving tool 10 of the embodiment is an example of a driving tool in one aspect of the present disclosure. The driver 1e of the embodiment is an example of a driver in one aspect of the present disclosure. The piston 1d of the embodiment is an example of a piston in one aspect of the present disclosure. The cylinder 1c of the embodiment is an example of a cylinder in one aspect of the present disclosure.

[0053] The inner peripheral surface 1j of the embodiment is an example of an inner peripheral surface in one aspect of the present disclosure.

[0054] The housing 21 of the embodiment is an example of a housing in one aspect of the present disclosure. The weight 5 of the embodiment is an example of a weight in one aspect of the present disclosure.

[0055] The concave portion 21m in the embodiment is an example of the inner wall in one aspect of the present disclosure.

[0056] The lifter 3 in the embodiment is an example of the lifter in one aspect of the present disclosure.

Explanation of Reference Numerals

[0057] 10 Driving tool 11 Tool body 12 Grip 13 Trigger 14 Controller 15 Battery attachment part 16 Battery pack 17 Drive unit case 18 Magazine 19 Switch 1 Housing 1a Upper part of housing 1b Lower part of housing 1c Cylinder 1d Piston 1e Driver 1f Accumulation chamber 1g Damper 1h Lower case 1j Inner peripheral surface L Engaged part L1 Lower end rack 2 Nose part 2a Driving passage 2b Injection port 2c Contact arm 3 Lifter 3a Wheel 3b Rotation shaft P Engaging part P1 Rear end pin 4 Drive unit 4a Motor 4b Reduction gear train 5 Weight 5a Front part 5b Left part 5c Curved part 5d Upper extension part 5e Upper groove part 5f front protrusion 5g downward extension 5h lower groove 5p center of gravity J1 axis of movement J2 left - right center J3 motor axis J4 front - rear center 20 driving tool 21 housing 21a upper part of housing 21c cylinder 21k first rib 21m recess 21n second rib

Claims

1. A driving tool, comprising: a driver for striking a driving tool; a piston to which the driver is connected; a driving tool having a cylinder for generating gas pressure by the piston, wherein the cylinder is made of iron.

2. The driving tool according to Claim 1, wherein the cylinder has an inner peripheral surface for slidably holding the piston, and the inner peripheral surface is not surface-treated.

3. The driving tool according to Claim 1 or 2, wherein the cylinder is heat-treated.

4. A driving tool, comprising: a driver for striking a driving tool; a piston to which the driver is connected; a cylinder for generating gas pressure by the piston; a cylindrical housing for accommodating the cylinder and extending along the vertical direction; a driving tool having a weight provided inside the housing.

5. The driving tool according to Claim 4, wherein the weight is disposed at an upper and lower position corresponding to a range within the length of the cylinder and around the cylinder.

6. The driving tool according to Claim 4 or 5, wherein the weight is fixed to the inner wall of the housing.

7. The driving tool according to any one of Claims 4 to 6, wherein the driving tool has a grip extending rearward from the housing, and the weight is disposed such that the center of gravity of the weight is located on a front side of the front and rear center of the housing.

8. The driving tool according to any one of Claims 4 to 7, wherein the driving tool has a grip extending rearward from the housing, and a lifter for moving the driver upward, the lifter being located on a first side, either left or right, of the left and right center of the grip, and the weight is disposed such that the center of gravity of the weight is located on a second side opposite to the first side across the left and right center of the grip.

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