JPH09290375A - Nose part screw guide fitting mechanism in screw driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nose part screw guide fitting mechanism in a screw driver that can fit easily and positively without directionality with a small number of part items. SOLUTION: This screw driver applies impact to a driven screw, fed to a nose part 1, so as to drive a part of the driving screw into driven material, then rotates the driving screw to screw it in and guides the driving screw by a pair of screw guides 5 provided at both sides of the tip of the nose part 1 when the driving screw is driven out. The screw guides 5 are covered with a contact top 12 for protecting the driven material. A base part of each screw guide 5 is passed through a fitting pin 6, piercing the nose part 1, so as to be rotatably supported. A pair of keep pieces 13 are opposedly formed from the base part of the contact top 12, and both keep pieces 13 are arranged at both end parts of the fitting pin 6 to prevent slip-off of the fitting pin 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw guide mounting mechanism for guiding a driving screw in order to drive the driving screw vertically into a material to be screwed.

[0002]

2. Description of the Related Art Generally, in a screw driving machine, a pair of screw guides are rotatably and openably attached to the tip of a nose portion so that a driving screw can be driven vertically into a material to be screwed. This screw guide is attached to the nose with a mounting pin.
As shown in FIG. 6, reference numeral 5 denotes a bulging portion 26 at one end to prevent the bulging.
And a groove 27 was formed at the other end, and a rubber washer 28 was fitted into the groove 27 to prevent the groove from coming off.

[0003]

However, since the mounting pin 25 described above has the bulging portion 26 at one end and the groove 27 into which the rubber washer 28 is fitted, is formed at the other end.
The direction in which the mounting pin 25 is fitted into the screw guide is determined. As described above, since the mounting pin 25 has directionality and further requires a component such as a stop ring for preventing the disengagement, the number of components is increased and the assembling property is not good. In addition, the contact top had to be specially processed and attached independently.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a mounting mechanism for a screw guide of a nose part in a screw driving machine which has a small number of parts and has no directivity and can be mounted easily and surely. And

[0005]

In order to solve the above-mentioned problems, the screw guide mounting mechanism of the nose portion in the screw driving machine according to the present invention supplies a driving screw to the nose portion provided at the tip of the body. , A pair of screw guides provided on both sides of the tip of the nose part when the driving screw is driven out after being driven by rotating the driving screw after hitting a part of the driving screw against the material to be driven. In a screw driving machine in which the screw guide is covered with a contact top that protects the material to be driven, the base of each screw guide is rotatably supported by passing through the mounting pin that penetrates the nose. At the same time, a pair of pressing pieces are formed opposite to each other from the base of the contact top, and both pressing pieces are arranged at both ends of the mounting pin to attach the mounting pin. Characterized in that the retaining of the.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a screw driving machine, in which a driving screw 2 supplied to a nose portion 1 at the tip of a body is driven by a striking piston 3 arranged above the nose portion 1. A part of the material is hit and driven into the material to be screwed, and then the driving screw is rotated by a screw rotating mechanism (not shown) to be screwed.

A pair of screw guides are attached to the tip of the nose portion so as to be rotatable and openable and closable so that the hammer 2 is clamped from both sides at the time of impact so that it can be vertically driven into the material 4 to be screwed. . Further, a synthetic resin contact top 12 for protecting the material to be screwed is arranged at the tip of the nose portion 1 so that the tip of the screw guide 5 does not come into direct contact with the material to be screwed 4.

The screw guides 5 are rotatably supported by the nose portion 1. Also, the screw guide 5 is the nose portion 1.
The tips of the screw guides 5 are urged so that they abut against each other and are closed by a spring 7 arranged at the position, and when the impact piston 3 is driven, the driving screw 2 is guided from both sides so as to be driven vertically into the material 4 to be screwed Then, the driving screw 2 is driven out while pushing the screw guide 5 against the spring 7.

By the way, a mounting hole 10 for the mounting pin 6 is formed in the base of the screw guide 5. The mounting hole 10 has the same diameter as the shaft hole 11 formed in the nose portion 1 and has a diameter substantially the same as the thickness of the mounting pin 6 so that the mounting pin 6 can be smoothly inserted.

The mounting pin 6 is formed symmetrically at both ends with a small diameter portion 6a having a smaller diameter than the central portion, and when inserted into the shaft hole 11 of the nose portion 1, the left and right small diameter portions 6a are nose portions. 1 is formed so as to project from both side surfaces.

A contact top 12 is arranged at the tip of the nose portion 1 so that the tip of the screw guide 5 does not directly contact the material 4 to be screwed and the material 4 to be screwed is not damaged. . The contact top 12 is made of a flexible material such as rubber or synthetic resin and is formed into a short tubular shape. On both sides thereof, pressing pieces 13 for holding the nose portion 1 from both sides are formed upward. The holding piece 13 is provided with two through holes 14 each penetrating the small diameter portion 6a.

When the screw guide 5 is attached in the above structure, as shown in FIG. 4A, after the upper portion of the screw guide 5 is inserted into the tip of the nose portion 1, the shaft of one side surface of the nose portion 1 is inserted. The tip of the mounting pin 6 is inserted through the hole 11. The mounting pin 6 penetrates the shaft hole 11, the mounting hole 10 of the one screw guide 5, and the other mounting hole 10 of the screw guide 5, and the small diameter portion 6a from the other side surface of the nose portion 1. It is projected (see FIG. 4B). In this state,
The pressing pieces 13 of the contact top 12 are pushed upward while being expanded from both sides of the nose portion 1 from below, the both pressing pieces 13 are arranged at both ends of the mounting pin 6, and the small diameter portion 6a is made to penetrate the through hole 14. As a result, the base of the screw guide 5 is rotatably supported by the mounting pin 6. Both ends of the mounting pin 6 are sandwiched by the two pressing pieces 13 so as not to come out of the nose portion 1, while the contact top 12 also holds the pressing pieces 13 together.
Does not fall off the nose portion 1 by engaging with the small diameter portion 6a.

As described above, the mounting pins 6 having the small diameter portions 6a formed at both ends are formed symmetrically, and the shaft hole 11 of the nose portion 1 and the mounting hole 10 of the screw guide 5 are formed to have the same diameter. In addition, since the mounting pin 6 is formed into a size into which the mounting pin 6 can be inserted, the mounting pin 6 can be freely inserted from either side and the screw guide 5 can be inserted without limiting the insertion direction.
Can be attached to the nose part 1. Then, the mounting pin 6 once attached is held so as not to come out of the nose portion 1 by penetrating into the through hole 14 of the pressing piece 13 of the contact top 12 that protects the material 4 to be screwed, and the contact top 12 also has a nose. It never leaves Part 1. Further, since the mounting pin supports the screw guide and also serves as a mounting means for the contact top, the screw guide and the contact top can be mounted to the nose portion at the same time. Further, it is not necessary to add a retaining component such as a stop ring, so that the work efficiency can be improved and the assembling cost can be reduced.

As shown in FIG. 5, the mounting pin 20 is formed to have the same thickness from one end to the other end, and the contact top 1
You may make it form the fitting recessed part 21 of the magnitude | size which the said mounting pin 20 can fit in the inside of the 2 pressing piece 13. As shown in FIG.

According to this screw guide mounting mechanism, both end portions 20 of the mounting pin 20 projecting from both side surfaces of the nose portion 1 are provided.
By fitting a into the fitting recess 21 formed in the retainer piece 13 of the contact top 12, the screw guide 5 and the contact top 12 can be fitted to the mounting pin 6 without any special processing such as the above-mentioned small diameter portion. And can be easily and surely attached to the nose part 1.

[0016]

According to the present invention, since the mounting pins are formed symmetrically, there is no directional mounting, and the nose portion may be penetrated, so that the screw guide is not conscious of the direction of the mounting pin. Can be easily attached to the nose part. Moreover, since this mounting pin is prevented from coming off by the pressing piece of the contact top, there is no need to specially process the mounting pin, and no fixing parts for fixing this mounting pin are required, so the number of parts is reduced. can do. The contact top can also be fixed by means of mounting pins.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a screw driving machine to which a mounting structure of a screw guide and a contact top according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view of a main part showing a mounting structure of a screw guide and a contact top.

FIG. 3 is an exploded side view illustrating a mounting structure of the screw guide and the contact top.

4 (a), (b) and (c) are front views of main parts showing a mounting mode of a screw guide and a contact top.

FIG. 5 is a front view of essential parts showing another example of a mounting structure of a screw guide and a contact top.

[Fig. 6] Conventional screw guide mounting structure

[Explanation of symbols]

 1 Nose part 2 Driving screw 3 Impact piston 4 Material to be screwed 5 Screw guide 6 Mounting pin 12 Contact top 13 Presser piece 14 Through hole (engaging part)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeo Fujiyama 6-6 Nihonbashi-Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Inventor Koji Tanaka 6-6 Nihonbashi-Hakozaki-cho, Chuo-ku, Tokyo Max Incorporated (72) Inventor Kazuhiko Kuraguchi 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Inventor Shinobu Iino 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd.

Claims (1)

[Claims] 1. A driving screw is supplied to a nose portion provided at a tip of a body, the driving screw is struck and a part of the driving screw is driven to a material to be driven, and then the screw is rotated and screwed. When driven by a pair of screw guides provided on both sides of the tip of the nose, the screw guide is covered with a contact top that protects the material to be driven. The base portion of the contact top is rotatably supported by passing through the mounting pin that penetrates the nose portion, and a pair of pressing pieces are formed to face each other from the base portion of the contact top, and both pressing pieces are arranged at both ends of the mounting pin. A mounting mechanism for the screw guide of the nose part in the screw driving machine, characterized in that the mounting pin is prevented from coming off.