JPH0546854Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is first activated by operating the trigger member after pressing the contact member protruding from the tip of the injection part of the continuous-impact nailer against the material to be driven. This invention relates to a starting device that allows continuous hitting to continue in a stable manner.

(Prior art and its problems) For example, in the starting device of a normal continuous-impact nailing machine as disclosed in Utility Model Application No. 101720/1980, a contact member pressed against the surface of the material to be driven and a finger operation are used. A mechanism is adopted in which the trigger valve and the operating trigger member work together, and the trigger valve is activated to start the nail gun only when the contact member is operated in the order of the trigger member. The firing of nails is prevented.

Normally, when driving a nail with a nail gun, a phenomenon occurs in which the body of the nail gun separates from the surface of the material to be driven due to the reaction force of the striking piston that is driven by an impact. However, in a multi-striking nailing machine that makes multiple strikes for driving one nail, the movement of the body due to this reaction causes the contact member to separate from the surface of the material to be driven, which causes the trigger to fail. It occurred that the valve returned and the continuous blowing stopped. For this reason,
It is necessary to strongly press the nail gun against the driving material surface against the reaction force of the striking piston. but,
In particular, when working in an unstable nail driving position, the force with which the nail gun is pressed against the surface of the material to be driven tends to be insufficient, making the above-mentioned phenomenon more likely to occur.

(Purpose of the invention) This invention takes advantage of the safety mechanism based on the cooperation between the contact member and the trigger member, and once the nailer is started, the contact member separates from the material to be driven by the reaction of the nailer. To provide a starting device for a nail gun capable of stably continuing continuous hammering as long as a trigger member is operated even when the nail driver is operated.

(Means for Achieving the Object) In order to achieve the above-mentioned object, a starting device for a continuous percussion type nailer according to the present invention includes a percussion mechanism that impulsively drives a percussion driver, and a percussion mechanism that supplies compressed air to the percussion mechanism. a trigger valve for supplying and activating the striking mechanism;
a substantially cylindrical injection part disposed below the striking mechanism in which the impact driver can slide; a contact member disposed around the injection part; A continuous impact nailing machine having a manually operable trigger member that operates a valve stem of a trigger valve, wherein the trigger member is provided with a contact lever that operates the valve stem of the trigger valve;
a trigger lock lever that rotates between a first position where it engages with an engaging portion formed on the nailer body to prevent operation of the trigger member and a second position where it enables operation of the trigger member; and a lock release lever whose end opposite to the upper end of the contact member engages with the contact member and is rotated when the contact member is actuated. The trigger lock lever is biased to the first position, and the trigger lock lever is rotated to the second position by a spring force by the lock release lever rotated when the contact member is activated.

(Operations and Effects of the Invention) According to the above-described configuration, the trigger lock lever is normally biased to the first position, so even if an attempt is made to pull the trigger member first, it is impossible. Next, when the contact member is pressed against the workpiece and operated, the trigger lock lever is rotated to the second position by rotating the lock release lever. In this way, since the trigger member cannot be operated unless the contact member and the trigger member are operated in that order, it is possible to reliably prevent the nail gun from being fired inadvertently.

In addition, once the trigger lock lever is held in the second position, if the trigger member is pulled and operated, even if the contact member is moved to the workpiece due to the reaction of the striking piston. Even if the contact member separates from the surface, if the contact member comes into contact with the surface of the workpiece again and operates,
The nailer continues its percussion operation.

Furthermore, if the trigger member is operated first and then the contact member is operated, the trigger lock lever will engage with the engaging part of the nailer body and be locked, whereas the lock release lever will not rotate. However, since a spring is interposed between the lock release lever and the trigger lock lever, this spring will absorb the operational displacement between both levers and will not strain the entire mechanism. .

In addition, if you operate the trigger member and then the contact member in that order, the nailer cannot be started because the trigger member is blocked from operating, but if you release the trigger member and then pull it again, the trigger member will not be able to start. Since the nail driver can be driven, there is no need to once remove the nailer from the surface of the material to be driven and then re-target the nailing position, improving work efficiency.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a central vertical cross-sectional view of a continuous-impact type nailer, which has a grip section on one side.
a housing 1 having a cylindrical injection part 3 at the bottom; a movable cylinder 4 accommodated in the housing 1 so as to be able to reciprocate vertically and biased downwardly of the housing 1; A striking piston 6 is housed in the movable cylinder 4 so as to be able to reciprocate vertically, and integrally includes a striking driver 5 that is slidable within the injection section 3.
and an automatic switching valve mechanism 8 that selectively connects the inside of the movable cylinder 4 to the compressed air supply source 7 and the atmosphere as the movable cylinder 4 reciprocates;
a contact member provided with a lower end surface biased so as to protrude downward from the tip of the injection part 3;
It is composed of a trigger valve 11 that operates the automatic switching valve mechanism 8 by operating a trigger member 43 that is provided so as to be manually operable, and a magazine 12 that is provided between the injection section 3 and the grip section 2, and is movable. By repeatedly supplying and discharging compressed air to and from the cylinder 4, the impact piston 6 is repeatedly driven, and the impact driver 5 drives the magazine 12.
The nails 13 supplied to the injection part 3 are repeatedly hammered out.

Next, each component of the above nailing machine will be described in detail.

First, the housing 1 is formed into a cylindrical shape, and dampers 29 and 30 are provided on the inner walls at the upper and lower ends, and a cylindrical sleeve 15 is provided at the inner center.

An annular housing part 16 that opens upward is formed in the upper part of the sleeve 15, and a head valve 17 is housed in the housing part 16 so as to be movable up and down. The head valve 17 has an upper part 17a formed with a smaller diameter than a lower part 17b, and a compressed air supply hole 1 in the lower large diameter part 17b that connects the grip part 2 and the movable cylinder 4.
8 is formed and is urged downward by a spring 19 and air pressure.

Further, a sleeve guide 20 is provided on the outside of the lower part of the sleeve 15, and a movable sleeve 21 is provided on the inside thereof so as to be movable up and down.

The movable cylinder 4 is inside the sleeve 15,
It is housed so that it can reciprocate while its upper and lower end surfaces abut against the upper and lower dampers 29, 30. A spring 22 is provided between the head portion 4a of the movable cylinder 4 and the upper inner wall of the housing 1. The spring 22 always biases the movable cylinder 4 downward so that it is located at the bottom dead center, and when the movable cylinder 4 reciprocates, the deflection state changes from the minimum to the maximum. Further, a compressed air supply/discharge hole 23 is formed in the upper part of the side wall of the movable cylinder 4, and communication holes communicating with a return air chamber 24 formed between the movable cylinder 4 and the sleeve 15 are formed in the middle and lower parts. 25 and 26 are formed. Dampers 31 and 32 are also provided on the inner walls at the upper and lower ends of the movable cylinder 4, and the striking piston 6 is housed so that it can reciprocate while its upper and lower end surfaces abut against the upper and lower dampers 31 and 32 of the movable cylinder 4, respectively. ing. The movable cylinder 4 and the striking piston 6 constitute a striking mechanism.

The grip portion 2 is formed hollow, and has an air chamber 27 formed therein, and an air plug attachment portion 28 for an air hose connected to the compressed air supply source 7 is provided at the tip.

The injection part 3 guides the sliding movement of the impact driver 5 ejected from the housing 1, and has a nail supply port 33 opened on one side for receiving the connecting nail N supplied from the magazine 12.

The magazine 12 is a member that stores the spirally wound connecting nails N. A nail supply path 34 for the connecting nails N is provided between the magazine 12 and the nail supply path 33 of the injection section 3. The supply path 34 is provided with a mechanism for feeding the connecting nail N.

Next, the automatic switching valve mechanism 8 is composed of a head valve 17 and a movable cylinder 4, and is movable by automatically switching the supply and exhaust of compressed air into the movable cylinder 4 as the movable cylinder 4 reciprocates. The cylinder 4 and the striking piston 6 are repeatedly operated back and forth. That is, an upper O-ring 35a and a lower O-ring 35b are provided around the upper and lower outer circumferential surfaces of the supply/discharge hole 23 of the movable cylinder 4, whereas the upper and lower O-rings are provided on the inner surface of the small diameter portion 17a of the head valve 17. A contact surface 36 is formed on which the O-ring contacts.

In the above configuration, when the head valve 17 moves upward relative to the movable cylinder 4, the lower O-ring 35b
7a away from the inner wall of the contact surface 36, and at the same time the upper part O
Since the ring 35a contacts the contact surface 36,
The inside of the movable cylinder 4 is connected to a compressed air supply source 7 via a supply/discharge hole 23, a compressed air supply hole 18, and an air chamber of the grip portion 2. Therefore, since compressed air is rapidly supplied into the movable cylinder 4, the striking piston 6 is driven downward, and at the same time, the movable cylinder 4 is driven upward against the spring force of the spring 22 due to its reaction. Ru.

When the movable cylinder 4 moves upward, the upper O-ring 35a separates from the abutment surface 36 of the small diameter portion of the head valve 17, and at the same time the lower O-ring 35b abuts the abutment surface 36, so that the supply/discharge hole of the movable cylinder 4 23 communicates with the atmosphere, and the compressed air supplied into the movable cylinder 4 is exhausted to the atmosphere. For this reason,
The supply and discharge of compressed air to and from the movable cylinder 4 are automatically switched, and the air pressure acting on the lower surface of the cylinder head 4a of the movable cylinder 4 rapidly decreases, so the force of the spring 22 causes the movable cylinder 4 to move downward. Moving. When the movable cylinder 4 moves downward, the supply and discharge of compressed air is automatically switched again as described above, so that the movable cylinder 4
moves upward. Thereafter, the movable cylinder 4 repeatedly reciprocates in the vertical direction in the same manner.

Further, when compressed air is supplied into the movable cylinder 4 and the movable cylinder 4 is driven upward, the striking piston 6 is simultaneously driven downward, and the air compressed by the lower surface of the striking piston 6 is released from the communication holes 25 and 26. It is stored in the return air chamber 24. When the compressed air is exhausted, the pressure acting on the upper surface of the striking piston 6 is transferred from the return air chamber 24 to the movable cylinder 4 through the communication hole 26.
Since the pressure is smaller than the pressure supplied to the inside and acting on the lower surface of the striking piston 6, the striking piston 6 rises. In this way, as the movable cylinder 4 reciprocates, the automatic switching valve mechanism 8 automatically operates, and at the same time, the striking piston 6 repeatedly reciprocates in the opposite direction to the movable cylinder 4, causing the nail 13 inside the injection part 3 to is repeatedly struck by the impact driver 5 and driven into the material to be driven 50.

As mentioned above, the automatic switching valve mechanism 8
The operation of the head valve 17 is automatically started when the head valve 17 is raised.
is raised by actuating the trigger valve 11.

The trigger valve 11 selectively connects the air passage 37 opened at the lower end surface of the annular housing part 16 of the head valve 17 to the atmosphere or the air chamber 27 of the grip part 2. Usually, a spring 38 connects the air passage 37 to the atmosphere. By pushing the trigger valve stem 39 against the spring force of the spring 38, the O-ring 40 provided at the upper portion is moved, and the air passage 37 is communicated with the air chamber 27 of the grip portion 2. It is connected to the air passage 41.

When the air passage 37 is open to the atmosphere, the head valve 17 is at the lower end position due to the force of the spring 38 and air pressure, and the trigger valve 11 is actuated by pushing the trigger valve stem 39, and the head valve 17 is moved by the force of the spring 19. It moves upward against the force, and the automatic switching valve mechanism 8 is activated.

Next, the above-mentioned nailing machine is provided with a starter device a that operates the trigger valve 11 only when the push-up operation of the contact member 9 and the manual operation of the trigger member 43 work together.

As shown in FIGS. 2a and 2b, the trigger member 4
Two opposing plate-like parts 43a are formed at the tip of the switch 3, and a contact lever 45, a trigger lock lever 46, and a lock release lever 47 are mounted on a support shaft 44 provided between these plate-like parts 43a. Each is rotatably supported.

A substantially central portion of the contact lever 45 is arranged to face the valve stem 39 of the trigger valve 11, and the tip engages with a receiving portion 48 of the nailer main body 1a including the housing 1.

The trigger lock lever 46 has an engaging pawl 51 that engages with an engaging part 49 formed on the nailer main body 1a, and the engaging pawl 51 has a first engaging part 49 that can be engaged with the engaging part 49. It is provided to rotate between the position and the second position where it cannot be engaged, and is normally biased toward the first position by the first spring 52. When the trigger lock lever 46 is in the first position, the engaging pawl 51 of the trigger lock lever 46 is engaged with the nailer main body 1.
Since the trigger member 43 is engaged in the engaging portion 49 of
operation is prevented. On the other hand, when the trigger lock lever 46 is in the second position, the engaging claw 5
1 does not engage with the engaging portion 49, the trigger member 4
3 becomes possible, and the contact lever 45 can be rotated.

The lock release lever 47 is pivoted at its intermediate portion, has an engaging piece 53 formed at one end, and has the other end 54 disposed to face the upper end of the contact member 9. Further, the lock release lever 47 is arranged so that the other end 54 engages with a stop portion 55 formed on the nailer main body 1a when the lock release lever 47 rotates. The other end 54 is provided so that when the contact member 9 is activated, it engages with the contact member 9 and the lock release lever 47 is rotated.

A second spring 56 is further wound around the trigger lock lever 46, and one end of the second spring 56 is engaged with a protrusion 57 of the trigger lock lever 46, and the other end is engaged with an engaging piece 53 of the lock release lever 47. It matches. Note that the spring force of the second spring 56 is equal to that of the first spring 5.
It is set to be stronger than 2.

In the above configuration, by pressing the tip of the injection part 3 against the surface of the material to be driven 50, as shown in FIG. 3a, the contact member 9 moves upward relative to the housing 1, and the tip 9a pushes up the tip of the lock release lever 47. The lock release lever 47 rotates around the support shaft 44,
At this time, since the spring force of the second spring 56 is stronger than the first spring 52, the trigger lock lever 46 is also integrated with the lock release lever 47 due to the spring force of the second spring 56, and the support shaft 44 is Rotate around the center to the second position.

When the trigger member 43 is pulled, the contact lever 45 rotates and pushes the valve stem 39 of the trigger valve 11 into the valve housing 40, as shown in FIG. valve stem 3
9 is pushed in, the compressed air in the mating chamber 27 is connected through the air passage 37 to the annular receptacle 16 of the head valve 17, and the nailer is started.

At this time, the pushing of the valve stem 39 by the contact lever 45 is maintained only by the pulling operation of the trigger member 43. Further, the contact member 9 is for rotating the lock release lever 47, and is not related to the operation of the valve stem.
Therefore, even if the contact member 9 separates from the material to be driven 50 due to the reaction force of the impact piston 6 during the continuous impact operation, the impact does not stop and continues stably.

On the other hand, when the trigger member 43 is pulled first, as shown in FIG. Since the trigger member 43 is engaged, the trigger member 43 cannot be pulled any further. Therefore, the contact lever 45 cannot push in the valve stem 39 of the trigger valve 11, so the nail gun will not start. In this way, since the trigger valve 11 cannot be operated unless the contact member 9 and the trigger member 43 are operated in this order, it is possible to reliably prevent the nail gun from firing accidentally.

Furthermore, when the contact member 9 is pressed against the workpiece 1 after pulling the trigger member 43, the trigger lock lever 46 is pressed against the engaging portion 49 of the nailer main body 1a, as shown in FIG. In contrast to the engagement and locking, the lock release lever 47 is pushed up by the contact member 9 and rotates, but there is a second spring between the lock release lever 47 and the trigger lock lever 46. 56, the second spring 56 absorbs the operational displacement between the levers 47, 46, and the entire mechanism does not become strained.

Even if the trigger member 43 is pulled first, when the trigger member 43 is released, the second spring 5
6, the trigger lock lever 46 is rotated to the second position and returned to the state shown in FIG. 3a, so that the nailing machine can be started by pulling the trigger member 43 again. Therefore, there is no need to once remove the nailer from the 50 surface of the material to be driven and then retarget the nailing position again, improving work efficiency.

Note that the contact lever 45 does not need to be rotatably supported.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view showing a continuous percussion nailer according to the present invention together with an air circuit, Figs. 2a and b are a side view and a bottom view of the starting device in the above nailer, respectively, and Fig. 3a is a - d are explanatory diagrams of the operation mode of the above-mentioned starting device. Code a... Starting device, 1a... Nailer body, 5
...impact driver, 9...contact member, 11
...Trigger valve, 39...Valve stem, 43
...Trigger member, 45...Contact lever, 4
6...Trigger lock lever, 47...Lock release lever, 49...Engaging portion.

Claims (1)

[Scope of claim for utility model registration] A striking mechanism for shockingly driving a striking driver;
a trigger valve for supplying compressed air to the striking mechanism to start the striking mechanism; a substantially cylindrical injection section disposed below the striking mechanism in which the striking driver can slide; In a continuous percussion nailing machine, the continuous percussion nailer has a contact member disposed therein, and a manually operable trigger member that operates a valve stem of the trigger valve in cooperation with the operation of the contact member, the trigger member having the A contact lever is provided for actuating the valve stem of the trigger valve, and the contact lever engages with an engaging portion formed on the nailer body to prevent actuation of the trigger member and enable actuation of the trigger member. a trigger lock lever that rotates between the trigger lock lever and the second position; and a lock release lever whose end opposite the upper end of the contact member engages with the contact member and is rotated when the contact member is actuated. The trigger lock lever is normally biased to the first position, and the trigger lock lever is spring-loaded to the second position by a lock release lever rotated when the contact member is actuated. A starting device for a continuous percussion nailer, which is characterized in that it can be rotated by force.