JPS6331904Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a nail holding device for a nail gun that drives nails using a striking member that is struck by a piston.

(Conventional Device) As this type of device, for example, a device in which a magnet is provided at the tip of the main body and a nail is held by this magnet has been known.

However, this device using a magnet has a drawback that when the piston impacts the striking member, the nail easily falls off due to the impact.

In addition, various other devices have been known in the past, but in all of these devices, if the nail holding mechanism is simplified, the held nail will come off easily, and if the mechanism is made to make it difficult for the nail to come off, the nail will easily come off. This method has both advantages and disadvantages, such as making it difficult for the nail to come off when hammered, and is not necessarily satisfactory.

(Objective of the Present Invention) The object of the present invention is to provide a holding device that can easily hold a nail and prevent the nail from coming off easily.

(Example of the present invention) Figure 1 shows the tip mechanism of a nail gun.
This tip mechanism consists of a striking device a and a nail holding device of this invention, and the nail holding device of this invention is a main body b.
and a striking member c built into the main body b.

Below, first, the striking device a will be explained, and then,
An example of this invention will be described.

The impact device a is constructed by integrating a cylinder 2 into a case 1, and a free piston 3 is slidably provided in the cylinder 2.
The impact device a operates a start valve (not shown) to alternately apply air pressure to both end faces of the free piston, causing the free piston 3 to reciprocate.

The nail holding device of this invention is connected to the striking device a, and its main body b includes a base cylinder 4 directly connected to the cylinder 2, a guide cylinder 5 located at the tip of the main body b, and these base cylinders 4. The main element is an intermediate tube 6 which is located between the guide tube 5 and the guide tube 5 and connects them.

The base cylinder 4 has a flange part 4a in airtight surface contact with the end surfaces of the case 1 and the cylinder 2 at approximately the center thereof, and a cylinder on the rear side with this flange part 4a as a boundary. 2, and a cylindrical portion 4c on the front side.
, the protrusion 4b is screwed into the cylinder 2,
It is connected to the striking device a.

Further, by screwing the cylindrical part 4c into the rear part of the intermediate cylinder 6, and by connecting the intermediate cylinder 6 and the cylindrical part 4c in this way, the striking member c is attached to the axial center of both of them. Slide holes 7 and 8 for reciprocating the
A regulating hole 10 is formed to guide the central large diameter portion 9 of the member c.

Therefore, the central large-diameter portion 9 of the striking member c can reciprocate only within the range of the regulating hole 10, so the maximum stroke of the striking member c is limited to the shallow threaded engagement between the base cylinder 4 and the intermediate cylinder 6. It will depend on the depth.

Then, the central large diameter portion 9 of the striking member c is the regulating hole 1.
0, in the illustrated state in which it is in contact with the base cylinder 4 side, the rear end of the striking member c is in contact with the protrusion 4b.
It is adapted to protrude outward from the cylinder 2, that is, into the cylinder 2.

Further, the guide tube 5 of the main body b has an insertion opening 5a for inserting the head of the nail, and a sliding member that can slide in the same direction as the striking member c is provided in the insertion opening 5a. 11 is exposed, and a large diameter portion 11a formed at the tip of the outer circumference of the sliding member 11 is brought into sliding contact with the inner circumferential surface of the guide cylinder 5. A compression spring 12 is interposed between the large diameter part 11a and an annular protrusion 5b formed on the inner circumference of the guide cylinder 5, on the outer periphery of the small diameter part 11b located behind the large diameter part 11a.

Therefore, the sliding member 11 is pushed into the insertion opening 5a of the guide tube 5 by the action of the spring 12.
A force is given in the direction of protruding from. however,
Since a stopper 13 is provided on the small diameter portion 11b of this sliding member 11, when the sliding member 11 is at its most advanced position, this stopper 13 is located on the annular protrusion 5b.
is held in the position shown in FIG.

The sliding member 11 has a slide hole 14 that is the same as the slide hole 8 formed in the axial center of the intermediate cylinder 6.
The front part of the striking member c is slidably fitted into this slide hole 14. and,
When the sliding member 11 is in the illustrated position and the striking member c is in the illustrated position, the tip of the striking member c is positioned slightly inside the slide hole 14.

Furthermore, three elongated holes 5c are formed at equal intervals in the circumferential direction of the guide tube 5 at the tip thereof. The length of these long holes 5c is about 1/4 of the circumference of the guide tube 5, and wall surfaces 5c' concentrated at the center point of the guide tube 5 are formed at both ends of the long holes 5c. ing.

As shown in FIG. 2, a stopper 15 is inserted into each of the elongated holes 5c formed as described above. This stopper 15 is a rod-shaped body with a circular cross section, and has an inner diameter with the same radius of curvature as the inner diameter of the guide tube 5 and an outer diameter with a radius of curvature slightly larger than the outer diameter 5' of the guide tube 5. 5c into an arc shape, and both end faces of the long hole 5
It is cut parallel to both wall surfaces 5c' of c. Of these two end faces, the width L ₁ between the edges on the outer circumference side is made slightly larger than the width l between the edges on the inner circumference side of the elongated hole 5c, and the width between the edges on the inner circumference side
L ₂ is made smaller than the width l of the elongated hole 5c.

Therefore, this stopper 15 has a long hole 5c.
The stopper 15 can protrude inwardly from the guide tube 5, but when it is most inwardly protruded, the outer circumferential circle of the stopper 15 stops at a position slightly protruding outward from the outer circumferential surface of the guide tube 5'. There is no possibility that it will come out through the hole 5c.

In this way, the stopper 15 is able to move the sliding member 11 when the sliding member 11 is in the position shown in FIG.
The stopper 15 faces the large diameter portion 11a of the stopper 15, and maintains the state of being pushed out from the elongated hole 5c in the centrifugal direction by the large diameter portion 11a.

The sleeve 16 is slidably inserted in the axial direction of the guide tube 5 onto the outer periphery of the guide tube 5 which holds the stopper 15 in the elongated hole 5c as described above. The inner periphery of the sleeve 16 has an annular convex portion 16a that slides along the outer periphery of the guide tube 5 and pushes the stopper 15 in the centripetal direction of the guide tube 5. , the stopper 15 is configured to engage with the inner peripheral surface of the annular convex portion 16a of the sleeve 16.

Further, a stepped portion 5d is formed on the outer periphery of the guide tube 5, and the stepped portion 5d and the annular convex portion 16a together form a chamber, in which a compression spring 17 is housed.

Therefore, the sleeve 16 is subjected to a force in the same direction as the sliding member 11 due to the action of the compression spring 17, and the stopper 15 closes in the elongated hole at the large diameter portion 11a of the sliding member 11 as described above. In the illustrated state in which it is pushed outward from 5c, the front inclined portion 16b of the annular convex portion 16a comes into contact with the stopper 15.

Next, the action will be explained.

When the head 18 of the nail shown by the dashed line in FIG. retreat against the force. When the head 18 of the nail is pushed in while pushing the sliding member 11 in this way, when the head 18 passes the stopper 15, the sliding member that had caused the stopper 15 to protrude outward from the elongated hole 5c 11 large diameter portion 11a
The binding force of will be lifted.

When the force on the stopper 15 is released in this way, the sleeve 16 is released from the compression spring 17.
The inclined portion 1 of the annular convex portion 16a moves forward due to the action of
The stopper 15 is pushed inward into the guide cylinder 5 by the cam action of the cam 6b. When the stopper 15 is pushed in, its inner circumference protrudes from the inner circumference of the guide cylinder 5, so that the head 18 of the nail is pushed into the stopper 1.
5 and the large diameter portion 11a of the sliding member 11. At this time, since the outer circumferential side of the stopper 15 slightly protrudes outward from the outer circumferential surface of the guide cylinder 5, the sleeve 1
Since the annular convex portion 16a of No. 6 is blocked by the outer periphery of the stopper 15, the sleeve 16 remains at the most extended position and the stopper 15 remains pushed in as described above.

After the nail gun holding the nail head 18 in this manner is moved while maintaining this state and the tip of the nail is positioned at a desired location, the start valve is operated to remove the free piston 3. Give a blow to the striking member c. When the striking member c is struck in this manner, the impact force is transmitted to the head 18 of the nail held between the stopper 15 and the sliding member 11 through the striking member c, so that the nail is struck as desired. Driven into place.

The piston 3 reciprocates within the cylinder 2, and during this time the hammering member c repeats the reciprocating motion, driving more and more nails, until the tip of the sleeve 16 coincides with the driving surface. When the tip of the sleeve 16 matches the driving surface in this way, the sleeve 16 retreats against the compression spring 17 due to the force of the nail gun, and eventually the tip of the sleeve 16 and the guide tube 5 Insertion port 5
a and the tip will now match. When the sleeve 16 retreats as described above, the cam action of the inclined portion 16b of the annular convex portion 16a of the sleeve 16, which was pressing the outer circumferential surface of the stopper 15 from the outside, is removed, so that the pressing force against the stopper 15 is released.

In this way, the force on the stopper 15 is released and the stopper 15 returns to its free state.

Therefore, the head 18 of the nail, which has been held between the stopper 15 and the sliding member 11, is released, and the head 18 of the nail is automatically removed from the holding device of this invention, and thereafter, the nail head 18 is not hammered. Member c is the regulation hole 10
The nail continues to be driven in by the hammering action of the hammering member 3.

Note that the stopper 15 performs its function by holding the head 18 of the nail between it and the sliding member 11, so a ball may be used instead of the rod-shaped stopper. In this case, the long hole 5
c is formed into an inverted truncated conical hole with a smaller diameter on the inner circumferential side of the guide cylinder 5 than on the outer circumferential side, and balls are individually fitted into the hole, or both wall surfaces of the elongated hole 5c are formed into the inverted truncated conical shape. It is also possible to have a long hole with a length that is an integral multiple of the diameter of the ball, and to fit a number of balls corresponding to the multiple into the long hole.

However, if the stopper 15 is made of a ball, the head 18 will be held down by the ball, so if the head 18 of the nail is square as shown in FIG. It may not be possible to hit either of them.

(Structure of the present invention) The structure of this invention is that a striking member is installed inside the main body,
In a nail holding device of a nail gun that hammers the nail held at the tip of the hammering member,
An insertion opening for inserting the head of the nail is formed at the tip of the main body, and a stopper mounting hole is formed around the insertion opening, and a stopper with a diameter larger than the wall thickness of the main body is inserted into this hole. The body is inserted so as to be freely protrusive and retractable in the centrifugal direction, and a sliding member that guides the tip of the striking member is installed inside the body so as to be slidable in the axial direction. A compression spring that applies forward force is interposed between them, and a sleeve that moves in the same direction as the sliding member is provided on the outer periphery of the main body, and a compression spring that applies forward force is also interposed in this sleeve, It is characterized in that the tip of the sleeve protrudes from the tip of the main body, and the sleeve has an inclined surface projecting from the center thereof to press the stopper toward the center of the main body.

Therefore, if the head of the nail is pushed in and the sliding member is retracted by the head, the head of the nail can be automatically clamped between the sliding member and the stopper.

(Effects of the present invention) As the head of the nail is automatically clamped as described above, it becomes easy to hold it.

Furthermore, in the state in which the nail is held as described above, the sleeve presses the stopper, so that the nail will not come off even if it is acted upon by the hammering member.

That is, according to this device, it is easy to hold the nail, and once the nail is held, it will not come off during work, and all of the above-mentioned conventional drawbacks can be solved.

In particular, this device has the feature that when the nailing work has progressed far enough and the tip of the sleeve comes into contact with the nailing surface, the sleeve automatically releases the stopper. This has the effect of allowing you to finish nailing in a short time by being completely separated from the machine.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention.
The figure is a cross-sectional view of the tip of a nail gun equipped with this invented device, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. b...main body, c...beating member, 5a...insertion port, 5c...long hole, 11...sliding member, 12...
Compression spring, 15... Stopper, 16...
Sleeve, 17... Compression spring, 18... Nail head.

Claims (1)

[Scope of utility model registration request] In a nail holding device for a nail driver in which a striking member is installed inside a main body and a striking member is applied to drive a nail held at a tip of the nail driver, an insertion opening for inserting the head of a nail is formed at the tip of the main body, and a stopper mounting hole is formed around the vicinity of the insertion opening, and a stopper having a diameter larger than the thickness of the main body is inserted into the hole so as to be freely inserted in and out of the main body in a centrifugal direction, and further
A sliding member for guiding the tip of the striking member is mounted inside the main body so as to be slidable in the axial direction, and a compression spring is interposed between the sliding member and the main body to apply a forward force.
A nail holding device for a nail driver in which a sleeve that moves in the same direction as the sliding member is provided on the outer periphery of the main body, and a compression spring that also applies a forward force to the sleeve is interposed between the sleeve and the tip of the sleeve, so that the tip of the sleeve protrudes beyond the tip of the main body, and a sloped surface portion is provided in the central portion of the sleeve to press the stopper toward the center of the main body.