Patent Description:
Nailing machines are widely used in which a driver (striking rod) connected to a piston that is driven by compressed air is used to drive out a nail in an injection port. A plurality of nails to be driven out are stored in a connected state in a magazine provided at a lower portion of the nailing machine, and the nails are sent one by one into a nose and driven out sequentially.

Incidentally, in such nailing machines, since the inner diameter of the nose is larger than the outer diameter of a head portion of the nail to be driven out, the nail is often in a state of being tilted with respect to the axis of the nose, and if this nail is driven out by the driver, in many cases, the nail is driven into a mounting material in a tilted state, and inconveniences such as the nail being mounted in a bent state after mounting often occur.

In order to solve such a problem, various methods as shown in the following patent literature, for example, have been proposed.

<CIT> discloses a nozzle assembly for a nail gun including three wing portions pivotally mounted on a nozzle holder to define a nozzle tapering towards a nozzle outlet. When the wing portions are in their inner closed position they can support an upholsterer's nail with the nail head resting on the inner walls of the nozzle, and the nail stem located in the nozzle outlet. When the nail is being driven into upholstery, the nail head forces apart the wing portions against the action of a resilient support ring. The wing portions may be surrounded by an outer casing which may be rotatable. This outer casing may have a cut-away portion or flat formed on it.

In the inventions relating to the nailing machine described in PTL <NUM>, at the tip portion of the nailing machine related to the nail tip guide tool of the present invention, there is provided a structure for driving the nail into a mounting material straight without diagonally driving the nail.

Further, the guide mechanism described in PTL <NUM> has a feature that a ratchet member formed of an inclined surface that guides the tip of the nail into an injection port and a guide surface that guides the tip of the nail shaft to the center of the injection port is provided to be biased such that the guide surface protrudes into the injection port, a guide protrusion that can be inserted into a lower nail hole of a metal fitting for construction such as reinforcing hardware, as a mounting material, is formed to face downward, and the tip portion of the nail can be driven along the guide protrusion.

However, the nailing machine described in PTL <NUM> has a problem that it is structurally large and a correction cannot be made depending on a tilting direction of the nail. Further, the guide mechanism described in PTL <NUM> has a problem that the structure of the injection port is complicated and it tends to be large in terms of a device. In addition to the above, many proposals have been made. However, they have advantages and disadvantages, and there are still practical problems.

The present invention has an object to provide a guide device which is structurally simple and can reliably correct an inclination of a nail.

In order to solve the above problems, the present invention adopts a configuration as in <FIG>. In the configuration, a nail tip guide tool <NUM> by a hollow container <NUM> having a funnel-shaped lower portion and having, at both upper and lower end portions, opening portions equal to or larger than an inner diameter of a nose portion is mounted to an end portion of the nose portion <NUM>, a plurality of guide pieces <NUM>, which correct a tip of a nail that has passed through the nose and been driven in an oblique posture to a straight posture, are provided on an inner bottom surface <NUM> of the funnel-shaped container <NUM> in a circular shape and in a state where central portions are gathered together, and a mortar-shaped recess portion <NUM> is formed on an upper surface portion of the aggregate of the plurality of guide pieces <NUM>, so that the tip of the oblique nail is guided to a center of a mortar-shaped lower portion and the nail is interposed in the central portion of the aggregate of the gathered guide pieces to push and expand the plurality of guide pieces in the right-left direction.

The bottom surface <NUM> of the funnel-shaped container member and the bottom surface of the guide piece that is in contact with the bottom surface <NUM> are formed as inclined surfaces whose center side is lowered, a torus-shaped press board <NUM> (<FIG>) is placed on the upper surface of the guide piece, and a coil spring <NUM> is provided on the upper surface of the press board <NUM> so as to press the press board downward, so that the plurality of guide pieces are biased in a direction of contracting the guide pieces toward the central portion.

If the lower end portion of the guide piece is caused to protrude in a conical shape <NUM> below the lower end portion of the funnel-shaped container member, when driving the nail into a member which has a prepared hole <NUM> formed in advance and is used for reinforcing hardware or the like of a building, the portion protruding into the prepared hole acts as a nail tip dummy, so that the member can be easily mounted by inserting the dummy portion <NUM> into the prepared hole <NUM> and then driving the nail, and on the contrary, if the lower end portion of the guide piece is located at the same level as or above the lower end portion of the funnel-shaped container member, nailing to a generally used flat mounting material can become easy (refer to <FIG> and <FIG>). Advantageous Effects of Invention.

As described above, since the funnel-shaped container member <NUM> having a hollow container shape is provided at the lower end portion of the nose portion by screwing and the plurality of guide pieces are provided inside thereof in a state where each guide piece can be expanded and contracted in a radial direction and is biased to a contraction side by the torus-shaped press board member (<FIG>) using the coil spring, the nail in the nose portion <NUM> is guided to the center side of a passage by the guide pieces and the posture of the nail is corrected such that the nail passes through the central portion of each guide piece. The number of guide pieces forming the nail tip guide portion in this case is preferably <NUM> or <NUM>.

As described above, the nail tip guide tool <NUM> of the present invention can be easily mounted to various nailing machines by screwing (<FIG>), as is clear from the sectional view of <FIG>, and also when mounting the metal reinforcing hardware <NUM> as a mounting material for reinforcing a structure that is often used in construction, it is possible to easily and efficiently perform work by using the guide piece type (<FIG>) described above. Further, by using the nail tip guide tool (<NUM>) having the cross-sectional shape in <FIG>, there is obtained a convenient effect that various types of nails can be straight and correctly nailed, without bending, into a base material to which a mounting material of a generally used material capable of being nailed is nailed.

Hereinafter, embodiments of the present invention will be described based on the drawings. In each of the following drawings, description is made as the piston side set to be up and the nose side, where a nail is driven out, set to be down, and the same applies to the sideways and diagonal directions.

<FIG> is an overall diagram showing an outline of a nailing machine, and a nailing machine <NUM> has a body portion <NUM> provided at a front portion of a grip portion <NUM> that is connected to an air supply source, and a piston that is operated by compressed air and a driver member (striking rod) <NUM> for striking are provided in the interior of the body portion <NUM>.

A nose portion <NUM> forming a passage for a nail that is driven is provided at a lower portion of the body portion <NUM>, and a supply port for supplying the nail, which is a driven material, is provided in a side portion of the nose portion <NUM>. Nails <NUM> are stored in a magazine <NUM> as an aggregate of the nails connected one by one, and when the nail is moved into the nose, in a state where the connected nails are disconnected and separated one by one, the nail is driven into a mounting material through an injection port below the nose portion.

<FIG> show "Example <NUM>", and in a case where the mounting material made of a wood-based material, which is generally frequently used, is to be nailed to a base structural material or the like, a "nail tip guide tool <NUM>" is mounted to an end portion of the nose portion <NUM> through a lid member <NUM> of a funnel-shaped container member forming the nail tip guide tool <NUM>. In <FIG>, a funnel-shaped container member <NUM> is joined to the lid member <NUM> of the funnel-shaped container member by a screw thread <NUM> provided at an upper end portion thereof and is mounted as the nail tip guide tool <NUM> by screwing it to a screw thread portion <NUM> provided at an outer peripheral portion of a lower end of the nose portion <NUM>, as shown in <FIG> and the like. If the funnel-shaped container member <NUM> is made detachable in this manner, since it can be removed from this portion as needed, it is convenient for replacement or repair of a main body of the "nail tip guide tool", a guide piece, or the like.

An inclined bottom surface portion <NUM> inclined downward is provided at a bottom portion of the funnel-shaped container member <NUM>. The angle of the inclined bottom surface is approximately <NUM>°, and the angle of the outer inclined surface is also set to <NUM>°. An opening portion <NUM> that serves as a nail passage is provided at the central portion of the bottom portion of the funnel-shaped container member <NUM>. The opening portion <NUM> is formed to be slightly larger than the diameter of a nail head.

A nail tip guide piece <NUM> is placed on the funnel-shaped container member <NUM>. The four guide pieces <NUM> each having a fan shape when viewed in plan view (<FIG>) are provided, the upper surface thereof is pressed by a torus-shaped press board <NUM> connected to the lid member <NUM> of the funnel-shaped container member through a coil spring <NUM>, each guide piece <NUM> is movably supported in a state where the inclined bottom surface of the funnel-shaped container member <NUM> and the inclined lower end surface of the guide piece <NUM> are in close contact with each other, a recessed rail L (<FIG>) provided on the lower surface of the press board <NUM> and a protrusion portion F (<FIG>) on the upper surface of the guide piece <NUM> are slidably fitted to each other, and the four guide pieces are in a gathered state on the circumference.

A mortar-shaped guide recess portion <NUM> is formed at the central portion of the upper surface of the aggregate of the four guide pieces that are in a gathered state on the circumference, and in the case of Example <NUM>, at the central portion of the recess portion, a narrow round hole <NUM> having a diameter smaller than the shaft diameter of the nail <NUM> to be driven is provided to penetrate to the lower surface of the aggregate of the guide pieces <NUM>. The through-hole <NUM> has the effect of making it easier for the tip of the nail <NUM> to be interposed in a case where the tip of the nail <NUM> driven in a tilted posture from the nose <NUM> slides to the center of the mortar shape along the inclined surface of the mortar shape and also has the good effect that in a case where the nail shaft or a nail head <NUM> tries to push and expand the four guide pieces <NUM> to the right and left after that, the dimension to be expanded is reduced by the dimension of the hole diameter.

In this example, as shown in <FIG>, the lower end portion of the guide piece <NUM> protrudes downward through the opening portion <NUM> of the bottom surface portion of the funnel-shaped container member. Then, a conical protrusion portion <NUM> of the guide piece <NUM> is fitted into a round hole <NUM> of an L-shaped reinforcing metal fitting <NUM> for reinforcing the mounting of a structural material <NUM> and positioned, and the nail <NUM> is driven and fixed by the nailing machine (refer to <FIG>).

In the nail tip guide tool <NUM> of the present invention, as shown in d of <FIG>, in a state where the nail <NUM> does not exist, all the guide pieces <NUM> are gathered at the center to form a circle, and the guide pieces are in a state of being gathered together. In this state, the mortar-shaped guide recess portion <NUM> is formed on the upper surface, and the nail <NUM> that has entered in a tilted posture from the nose portion <NUM> on the upper side is guided to the central portion along the inclined surface of the guide recess portion <NUM> (refer to <FIG>).

Since the upper end of the nail <NUM> is pressed downward by the driver member <NUM>, the tip portion of the nail <NUM> enters the central portion of the aggregate of the plurality of guide pieces <NUM> (b in <FIG>). In this way, naturally, the nail shaft becomes straight, and at this time, all of the plurality of guide pieces are pushed and expanded to the right and left, so that each guide piece <NUM> rises along the inclined bottom portion <NUM> of the funnel-shaped container member <NUM>.

Since the tip of the nail <NUM> is sharp, there is an advantage that the nail <NUM> can easily enter the central portion of the aggregate of the plurality of guide pieces. However, if the tip of the nail <NUM> is not so sharp, it does not matter. If the nail <NUM> continues to be pushed in by the driver member <NUM> in this state, the nail <NUM> enters the mounting material through the opening portion <NUM> and is driven until the flanged nail head <NUM> is eventually flush with the surface of the reinforcing metal fitting <NUM> (c of <FIG>).

The upper surface of the guide piece <NUM> is pressed by the press board <NUM> connected to the inward flanged lid member <NUM> of the funnel-shaped container member <NUM> through the coil spring <NUM>, and the guide piece <NUM> is movably supported in a state where the inclined bottom surface <NUM> of the funnel-shaped container member <NUM> and the inclined lower end surface of the guide piece <NUM> are in close contact with each other. The recessed rail L provided on the lower surface of the press board <NUM> and the protrusion portion F provided on the upper surface of the guide piece are slidably fitted to each other, and the plurality of guide pieces <NUM> can be expanded and contracted in an orderly manner.

Claim 1:
A nail tip guide tool of a nailing machine, which is used by being mounted to a tip portion of a nose portion (<NUM>) forming a passage for driving out various nails (<NUM>) from an air nailing machine (<NUM>), the nail tip guide tool (<NUM>) comprising:
a guide piece molded such that when a plurality of guide pieces (<NUM>) are gathered together at a central portion of an inclined bottom surface (<NUM>) of a funnel-shaped container member (<NUM>), a mortar-shaped recess portion (<NUM>) is formed at a central portion of an upper surface of an aggregate of the plurality of guide pieces (<NUM>),
a lid member (<NUM>) of the funnel-shaped container member (<NUM>) and the funnel-shaped container member (<NUM>) are joined together by screw threads (<NUM>) provided at the lid member (<NUM>) and the funnel-shaped container member (<NUM>),
the nailing machine (<NUM>) and the nail tip guide tool (<NUM>) are joined together by a screw thread (<NUM>) provided at the lid member (<NUM>) of the funnel-shaped container member (<NUM>) to correspond to a screw thread provided at an outer peripheral portion of a tip of the nose portion (<NUM>) of the nailing machine (<NUM>),
a tip of a nail (<NUM>) driven in a tilted posture from the nose portion (<NUM>) is guidable to a central portion of the mortar-shaped recess portion (<NUM>), and
the nail (<NUM>) is capable of continuing to be pushed in at a position of the central portion of the mortar-shaped recess portion (<NUM>), so that the plurality of guide pieces (<NUM>) are pushed and expanded to right and left and grip and surround a nail shaft portion of the driven nail (<NUM>) to straighten the posture of the nail (<NUM>),
wherein the nail tip guide tool is characterized by:
a protrusion portion (F) provided on an outer peripheral portion of an upper surface of the guide piece (<NUM>) and fitted into a recessed rail (L) radially provided on a lower surface of a torus-shaped press board (<NUM>),
a coil spring (<NUM>) having extension elasticity is fitted into both a circular groove (Y) for receiving the coil spring (<NUM>), which is provided on an upper surface of the torus-shaped press board (<NUM>), and a circular groove (P) for receiving the coil spring (<NUM>), which is provided on a lower surface of the lid member (<NUM>) of the funnel-shaped container member (<NUM>).