JPH0544058Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a nail holding device for a nailer, more specifically, it is capable of driving out the nail housed in the nose section of the tip of the nailer along the axial direction of the nose section. The present invention relates to a nail holding device that holds the nail in such a manner that the nail is held in the same manner.

(Prior art and its problems) Generally, in a nailing machine that drives nails with a circular enlarged diameter head, the inner diameter of the nose part from which the nail is driven is set slightly larger than the head diameter of the nail. Because the tip of the nail can move freely inside the nose, the nail is driven in at an angle. In particular, plasterboard nails, which have a larger head diameter than regular nails, have a greater tendency to do this. It is required to drive in the state.

For this reason, a mechanism has been proposed that guides the tip of the nail driven out from the nose of the nail gun to the center of the nose to maintain and guide the nail in a vertical position. For example, this is shown in Special Publication No. 56-20153. However, since this technology has a structure in which the nail holding and guiding mechanism is placed inside the nose member of the nail gun, the external shape of the nose part becomes large, which makes it difficult to confirm where the nail driving part is. There are some drawbacks, and the operability of the nail gun may be impaired.

Also, as a disclosure of the same technology,
-79783 is known. However, in this case,
Since the nail holding and guiding mechanism is provided protruding from the tip of the nail driving nose, this holding and guiding element comes into direct contact with the surface of the material to be driven, so the position of the nose can be moved to the side. In addition to the possibility that the nail may open when shifted and the nail may tilt, each holding guide element also opens with an impact when the nail is suddenly driven out, and in this case there is no means to prevent the above elements from opening. However, there has been a problem in that the elastic members that bias each element in the closing direction are stretched and displaced more than necessary, resulting in a loss of durability.

(Technical Problems of the Invention) The present invention solves the above-mentioned drawbacks, and in particular does not make the external shape of the nose portion unnecessarily large, does not impair operability, and is highly durable. The technical challenge is to provide the following.

(Means for Solving the Problems) In order to solve the above problems, a nail holding device for a nail gun according to the present invention has a tip end of a nose portion that has a driving passage in which a driver member for driving a nail is slidably accommodated. a cylinder which is disposed in the nose part and is normally located in a position further protruding from the tip of the nose part, is movable along the axial direction of the nose part while engaging with the surface of the material to be driven, and surrounds the nose part; In a nailing machine equipped with a safety device having a shaped engagement part, a plurality of nail guide elements are provided on the outer periphery of the tip of the nose part,
Each of the guide elements is pivoted so as to be openable and closable at a position where the distal end thereof protrudes beyond the distal end of the nose portion and enters in the extending direction of the driving path of the nose portion and a position where it retreats from the extending direction of the driving path;
These guide elements are biased in the closing direction by elastic means so that the nail in the driving path can be held inside them, while the engaging portion of the safety device engages with the surface of the material to be driven. When the nose portion moves along the axial direction, the guide element is housed inside the nose portion, and the guide element opened and operated during driving of the nail is received.

(Operations and Effects of the Invention) As described above, according to the present invention, the tip of the guide element is normally closed, so when driving a nail, the tip of the nail in the driving path of the nose part is in a closed state. It is received at the tip of the guide element and its shank is held in the center of the driving path. Therefore, the nail is accurately driven along the axial direction of the nose portion.

Also, when a nail is driven from the nose part, the engaging part engages with the material to be driven and moves along the axial direction of the nose part, the safety device is released, and the driver member is driven to drive the nail. to strike. The nail that received the impact pushes the guide element open and is driven out from between them, causing the guide element to open rapidly, but at this time, the nail is received by the inner surface of the engaging portion, so it does not open any further. Operation is regulated. Therefore, an unreasonable load that exceeds the elastic limit is not applied to the elastic means that biases the guide element, and durability is improved.

Furthermore, since the nail guide elements are provided on the outer periphery of the tip of the nose part, and each tip of the nail guide element is housed inside the engaging part of the safety device, the external shape of the tip of the nose part Since there is no need to make the shape large, there is no problem with the operation of the nailing machine. As the external shape of the tip of the nose section becomes larger, it becomes difficult to visually confirm from which point on the tip of the nose section the nail is being driven, and it also becomes difficult to visually confirm where the nail is being driven into the material to be driven. , the operability of the nailing machine is significantly impaired.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 3, the symbol A indicates a nail gun. This nailer A has a grip part 1 connected to the compressed air supply limit.
A body part 2 is provided in the front part of the body part 2, and a drive mechanism 4 for driving the nail striking driver member 3 by compressed air and a starting valve 5 for controlling the operation of the drive mechanism 4 are provided in the body part 2. 2 is provided with a nose portion 6 at the lower end thereof, and the driver member 3 is slidably accommodated in the nose portion 6, and a nail supply portion 7 is also provided in the nose portion 6.
After supplying nails from the nail supply section 7 into the driving passage 8, the drive mechanism 4 is actuated together with the starting valve 5 by operating the trigger lever 9. The nail is driven out with an impact using the driver member 3.

By the way, the nailing machine A has the drive mechanism 4.
A safety device 10 is provided to prevent the trigger lever 9 from being activated solely by operating the trigger lever 9. This safety device 10 has a contact arm 11 slidably provided along the axial direction of the nose portion 6, with its base end facing the trigger lever 9, similar to that used in a normal nailing machine. On the other hand, the tip engaging part 12 is arranged at the tip of the nose part 6, and the contact arm 11 is slid by engaging and pressing the tip engaging part 12 against the surface of the material to be driven. The configuration is such that the operation of the trigger lever 9 becomes effective only when the trigger lever 9 is pushed in.

Contact arm 11 constituting safety device 10
The tip engaging portion 12 is formed in a cylindrical shape and is arranged to surround the nose portion 6. This engaging portion 12 is normally located at a position further protruding from the tip of the nose portion 6, and is provided so as to be movable along the axial direction of the nose portion 6 while engaging with the surface of the material to be driven.

Next, as shown in FIGS. 1 and 2, two guide elements 13 are provided on the outer periphery of the tip of the nose portion 6.
is provided. Tip 1 of each guide element 13
3 a protrudes beyond the tip of the nose portion 6 , and the base portion 13 b is pivotally attached to a pivot shaft 14 provided on the nose portion 6 . Further, the tip portions 13a of these guide elements 13 enter the driving path 8 of the nose portion 6 in the extending direction and close the position (solid line position in FIG. 1), and retreat from the driving path 8 in the extending direction and open the position ( It is provided so that it can be opened and closed at the dotted line position in the figure. A torsion coil spring 15 is attached to each of the pivot shafts 14, and the torsion coil spring 1
5 urges each guide element 13 in the closing direction. Also, when in the closed state, each guide element 1
The inside of the tip portion of No. 3 is formed into a tapered shape.

Note that two or more guide elements 13 may be arranged, and the means for biasing the guide elements 13 to the closed state may be other elastic means instead of the torsion coil spring 15.

Furthermore, the guide element 13 is arranged inside the engaging part 12 of the safety device 10, and when the engaging part 12 engages with the surface of the material to be driven and moves along the axial direction of the nose part 6, It is formed to accommodate the guide element 13 therein.

Note that as the nail 3 loaded into the driving passage 8 of the nose portion 6, a connecting nail formed by connecting a plurality of nails via a connecting member is usually used.

In the above configuration, when driving the nail 16, the nail 16 is first loaded into the driving passage 8 of the nose portion 6. Next, the engaging part 12 of the safety device 10 is engaged and pressed against the surface of the material to be driven, and the engaging part 12 is pressed against the surface of the material to be driven.
2 along the axis of the nose portion 6. This releases the safety device 10. Safety device 1
The driver member 3 is driven by the release operation and the start operation (pulling the trigger lever 9), and strikes the nail 16. The tip of the nail 16 that has been hit is received by the tip of the guide element 13 when it is driven out from the tip of the driving path 8, and its shaft is held at the center of the driving path 8. Therefore, the nail 16 is accurately driven along the axial direction of the nose portion 6.

By the way, when the nail 16 is driven out by the impact of the driver member 3, it pushes the guide element 13 open with an impact, so the guide element 13 suddenly opens. Since it is received by the inner surface, further opening operation is restricted. Therefore, an unreasonable load exceeding the elastic limit is not applied to the torsion coil spring 15 that urges the guide element 13, and durability is improved.

Furthermore, since the engaging part 12 of the safety device 10 conventionally provided in nailing machines can be used as it is, there is no need to increase the external shape of the nose part 6, and operability is improved. not be damaged.

The nail holding device described above is particularly effective when driving nails with large head diameters.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional side view of a nail holding device of a nailing machine according to the present invention, FIG. 2 is a front view of the nail holding device, and FIG. 3 is an overall side view of the nailing machine. . Code, A... Nailer, 6... Nose part, 8...
Driving path, 3... Driver member, 12... Engaging portion, 13... Guide element, 15... Torsion coil spring, 16... Nail.

Claims (1)

[Claim for Utility Model Registration] The driver member for driving a nail is placed at the tip of a nose portion that has a driving passage that slidably accommodates it, and is normally located at a position that protrudes further than the tip of the nose portion. , a nailing machine equipped with a safety device having a cylindrical engagement portion that is movable along the axial direction of the nose portion while engaging with the surface of the material to be driven, and that surrounds the nose portion; A plurality of nail guide elements are provided on the outer periphery of the tip, and the tip of each of these guide elements is made to protrude beyond the tip of the nose section and enter a position in the extending direction of the driving path of the nose section, and a position where it retreats from the extending direction of the driving path. These guide elements are urged in the closing direction by elastic means so that the nail in the driving passage can be held inside them, while the engagement of the safety device is When the joint part engages with the surface of the material to be driven and moves along the axial direction of the nose part, the guide element is accommodated therein to receive the guide element that is opened and operated during driving of the nail. Features a nail holding device for a nail gun.