JPH11333745A - Automatic driver provided with recovering means of removed screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, surely and rapidly achieve the screw removing work and the work to recover the removed screw by arranging a bit attachment of a relatively simple constitution on a tip part of a bit to be rotated in a power driver or the like. SOLUTION: A bit guide hole 16 to guide and insert a bit is provided on a tip part of a bit 14 to be rotated in a power driver, a screw storage part 22 capable of storing a removed screw S is formed in an opening part of the tip of the bit guide hole, and a locking part 24 which is abutted on a part of a head part of the removed screw S to separate a tip blade part of the bit from a bit fitting groove formed on its head part is provided when the removed screw S is stored in a screw storage part 22. A bit attachment 18 in which a screw recovering passage 26 to recover the removed screw S separated from the bit is branched from the bit guide hole, is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic screwdriver which is driven by an electric or pneumatic type or the like suitable for removing screws, and in particular, uses various electronic devices and a large number of screws which are discarded or recycled in a few years. The present invention relates to an automatic screwdriver provided with a removing screw collecting means which can be easily used for removing a screw when disassembling various household appliances to be assembled.

[0002]

2. Description of the Related Art Many electronic devices manufactured and sold today are assembled using a large number of screws. Moreover, in this kind of electronic equipment, particularly, personal computers and the like are mass-produced and discarded or recycled in several years.

In this case, it is indispensable to separate recyclable materials from electronic devices to be discarded or recycled. In particular, screws must be reliably removed and collected.

Conventionally, however, various automatic drivers have been proposed and implemented which have a structure in which a mechanism for automatically supplying a screw to a tip portion of an electric screwdriver is provided in order to quickly and reliably perform a screw tightening operation. Have been.

For example, as an electric screwdriver with a screw supply mechanism, a screw (small screw) supplied to the tip of a rotating bit is attracted by the action of air suction and magnetic force and screwed into a screw hole. It is known (JP-B-59-37196).

In this type of electric screwdriver, the screw supplied to the tip of the rotary bit, that is, the catcher body surrounding the tip of the suction guide, is supplied via an air pipe to an automatic screw supply pipe attached to the suction guide. Are automatically supplied one by one by air pressure. Then, when a screw is supplied to the catcher main body through the automatic screw supply pipe, if the switch of the electric screwdriver is turned on, the rotating bit is rotated, and at the same time, the inner cylinder fixed to the electric screwdriver main body by the action of air pressure and The outer cylinder rises relatively to the suction guide, and the screw is suctioned to the tip of the rotary bit by the action of the air suction force and the magnetic force. Further, the outer cylinder rises relatively to the inner cylinder and the suction guide, so that the screw is attracted to the tip of the rotary bit and is rotating, and the tip of the rotary bit is at the lower end of the lower tubular portion of the suction guide. Protrude longer enough. At this time, the screw is attracted to the tip of the rotating bit by the action of magnetic force. Therefore, the screw can be screwed in this state.

[0007] As described above, various types of conventional electric screwdrivers that can perform a screw tightening operation quickly and easily have been proposed. However, with the removal of the screw, the removed screw can be easily and smoothly. An electric screwdriver or the like configured to automatically collect data has not yet been proposed or implemented.

[0008]

However, the above-mentioned conventional electric screwdriver with a screw supply mechanism is very effective when performing a screw tightening operation, but is very effective when performing a screw removing operation. It is conceivable that the screw removed through the automatic screw supply pipe is recovered by air suction force.However, the mechanism for moving the rotary bit forward and backward is complicated, and the originally removed screw is surely recovered. It does not have a convenient configuration.

That is, when removing the screw, a complicated mechanism for moving the rotary bit forward and backward as described above is not required, and in order to reliably recover the removed screw, the removed screw must be recovered. It is necessary to position the screw in an enclosed space that is easily guided to the passage.

Therefore, the present inventor has conducted extensive studies and, as a result, provided a bit guide hole for guiding and inserting the bit at the tip of the bit to be driven for rotation in an electric screwdriver and the like, A bit formed at a distal end opening portion of the screw storage portion capable of storing a removal screw, and formed at the head of the removal screw when the removal screw is stored in the screw storage portion by contacting a part of the head of the removal screw. A bit attachment provided with a locking portion for separating the tip blade portion of the bit from the fitting groove, and a screw recovery passage for recovering a detachment screw separated from the bit, which is branched from the bit guide hole, is provided. With this arrangement, for example, if a screw recovery case is connected to the screw recovery passage via a vacuum pipe, recovery of the removal screw can be easily, reliably, and quickly achieved. I have found that it is possible to obtain a screw removal dedicated electric driver which can be.

Accordingly, an object of the present invention is to provide a bit attachment having a relatively simple structure to a tip portion of a rotating bit of an electric screwdriver or the like so as to remove a screw and to remove the screw. It is an object of the present invention to provide an automatic screwdriver provided with a removing screw collecting means capable of easily, reliably and quickly performing a collecting operation.

[0012]

According to the present invention, there is provided an automatic screwdriver provided with a removing screw collecting means, wherein a bit guide hole for guiding and inserting a bit is provided at a tip portion of a bit which is driven to rotate in an electric screwdriver or the like. A screw housing portion capable of housing a removal screw is formed at the tip opening portion of the bit guide hole, and when the removal screw is housed in the screw housing portion, it comes into contact with a part of the head of the removal screw and A locking portion is provided for separating the tip blade portion of the bit from the bit fitting groove formed in the head, and a screw recovery passage for recovering the removal screw separated from the bit is branched from the bit guide hole. It is characterized in that the provided bit attachment is provided.

[0013] In this case, the diameter of the screw storage portion formed at the end opening portion of the bit guide hole is set to be larger than the diameter of the bit guide hole, and the boundary between the bit guide hole and the screw storage portion is tapered. And a locking portion for abutting the head of the removing screw, and a screw collecting passage can be branched off along the tapered step at the boundary.

Further, in order to define the maximum retracted position of the tip blade portion of the bit to be guided and inserted into the bit guide hole, the bit holding portion of the automatic driver and the bit attachment are connected by a connecting member of a predetermined length. It can be configured.

As an alternative, the leading edge of the bit to be guided and inserted into the bit guide hole is advanced to the opening end of the screw storage portion of the bit attachment, and waits.
It is also possible to adopt a configuration in which an actuator is connected and arranged between the bit holding portion of the automatic screwdriver and the bit attachment.

Further, a compression coil spring is provided between the bit holding portion of the automatic screwdriver and the bit attachment in order to elastically retreat the tip end portion of the bit guided and inserted into the bit guide hole. Can be.

Further, the screw collecting passage may be connected to the screw collecting case via a vacuum pipe.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an automatic screwdriver provided with a removing screw collecting means according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic structural view showing an embodiment of an automatic screwdriver provided with a removing screw collecting means according to the present invention. That is, in FIG. 1, reference numeral 10 denotes a grip portion of an electric screwdriver having a built-in electric motor, and a required bit 14 is detachably connected and held at a tip end of the grip portion 10 via a bit holding portion 12. Have been.

At the tip of the bit 14, a bit attachment 18 having a bit guide hole 16 for guiding and inserting the bit 14 is connected with a connecting member 20 such as a wire between the bit holding portion 12 of the electric screwdriver. Are arranged via a connection.

However, the bit attachment 18
In the opening at the tip end of the bit guide hole 16, a removing screw S
Is formed to have a capacity capable of accommodating therein.
In addition, the diameter of the screw storage portion 22 is set to be larger than the diameter of the bit guide hole 16, and therefore, at the boundary between the bit guide hole 16 and the screw storage portion 22, a step portion 24 formed by the dimensional difference is provided. Is formed in a tapered shape as shown.

Therefore, when the screw S is removed, the tapered step portion 24 causes the tip blade portion 14a of the bit 14 to enter the screw housing portion 22 through the bit guide hole 16 and to attach a required screw. After the screw S is removed from the object 26, when the tip blade portion 14a of the bit 14 is retracted into the bit guide hole 16, a part of the head of the screw S
4, the tip blade 14a of the bit 14 can be separated from the bit fitting groove formed in the head.

Therefore, at the boundary between the bit guide hole 16 and the screw housing portion 22, a screw collecting passage 28 for collecting the screw S separated from the tip blade portion 14a of the bit 14 is formed in the bit guide hole. The branch 16 is provided.

In the bit attachment 18 having such a configuration, one end of the vacuum pipe 30 is connected to the screw collecting passage 28, and the other end of the vacuum pipe 30 is connected to the screw collecting case 32. A vacuum pump 34 is connected to the screw collecting case 32 as needed. Therefore, when the screw S removed from the screw mounting object 26 by the bit 14 of the electric screwdriver is separated from the tip blade portion 14a of the bit 14 in the screw storage portion 22, the screw collecting passage is formed by the vacuum action. 28, it is possible to simply and reliably recover the screw to the screw recovery case 32 quickly.

In FIG. 1, reference numeral 36 denotes a bit 14 located between the bit holding portion 12 of the electric screwdriver and the bit guide hole 16 of the bit attachment 18.
A compression coil spring provided so as to surround the outer periphery thereof is shown, and the elasticity of the compression coil spring 36 allows the coupling member 20 to restrict the distance from the bit holding portion 12 to the bit attachment 18. ,
The tip blade portion 14a of the bit 14 can be configured to always and promptly and appropriately return to the maximum retracted position of the bit guide hole 16.

Next, the operation from the removal of the screw S by the bit attachment 18 to the recovery of the screw will be described in detail with reference to FIG.

First, the tip opening of the bit attachment 18 of the electric screwdriver according to the present invention is positioned above the screw S mounted on the screw mounting object 26. As a result, the head of the screw S is located in the screw storage 22 formed in the bit attachment 18. Therefore, the tip blade 1 of the bit 14 of the electric screwdriver is
4a is inserted into the screw storage portion 22, is fitted and locked in the bit fitting groove formed in the head of the screw S, and the electric motor is rotationally driven in a direction opposite to that of the screw tightening operation. S
Is started (see FIG. 2A).

By removing the screw S, the screw S
Is completely removed from the screw mounting object 26, the bit 14 is quickly retracted while receiving the elastic force of the compression coil spring 36, and at this time, the bit 14 is fitted and locked to the tip blade portion 14a of the bit 14. The head of the screw S abuts and locks on a tapered step portion 24 provided at the boundary between the screw housing portion 22 and the bit guide hole 16 (see FIG. 2B). Then, in the tip blade portion 14a of the bit 14, the screw S is separated from the bit fitting groove formed in the head thereof and retreats to its maximum retreat position.

As a result, the tip blade 14 of the bit 14
a separated from the vacuum pipe 30 (FIG. 1).
(See FIG. 2 (c)), and is recovered simply and reliably and quickly to a screw recovery case 32 via a vacuum pipe 30. (See FIG. 1).

FIG. 3 shows a modified embodiment of the automatic screwdriver provided with the removing screw collecting means according to the present invention. That is, when removing the screw, as shown in FIG. 2A of the above-described embodiment, the tip blade portion 14a of the bit 14 is advanced to the opening end of the screw storage portion 22 in the bit attachment 18, and the standby is performed. In such a work, when a large number of screws are removed, the labor burden is extremely large.

Therefore, as shown in FIG. 3, an actuator 38 such as an air cylinder is connected between the bit holder 12 and the bit attachment 18 of the electric screwdriver. Thus, when starting the screw removing operation, the actuator 38 is urged so that the tip blade portion 14a of the bit 14 is automatically moved to the opening end of the screw storage portion 22 in the bit attachment 18. , And can be kept on standby. Therefore,
In this state, the tip blade 14a of the bit 14 can be easily and quickly fitted and locked in the bit fitting groove formed in the head of the screw at the screw removal position.

Next, when the screw is removed by driving the electric motor, the urging of the actuator 38 is set to be released in conjunction with the drive switch of the electric motor. In response to this, the bit 14 is retracted while receiving the elastic action of the compression coil spring 36, and then the screw can be collected in the same manner as in the above-described embodiment.

When the operation of the electric motor is stopped and the screw is removed again, the operation described above is repeated by urging the actuator 38 in conjunction with the stopping operation of the electric motor. be able to.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the spirit of the present invention. It is.

[0035]

As is clear from the above-described embodiment, the automatic screwdriver provided with the removing screw collecting means according to the present invention guides and inserts the bit into the tip of the bit which is driven to rotate in an electric screwdriver or the like. In addition to providing a bit guide hole, a screw storage portion capable of storing a removal screw is formed in a tip opening portion of the bit guide hole, and one of the heads of the removal screw when the removal screw is stored in the screw storage portion. A locking portion for separating the tip blade portion of the bit from a bit fitting groove formed in the head thereof in contact with the portion, and further comprising a screw recovery passage for recovering a removal screw separated from the bit. The configuration in which the bit attachment branched from the guide hole is provided makes it easy, reliable and quick to remove the screws and recover the removed screws. It can be achieved.

Further, by using the automatic screwdriver provided with the removing screw collecting means according to the present invention, the chips generated at the time of removing the screw together with the removal of the screw,
Other dust and dust can be collected at the same time, preventing pollution of the surrounding environment, maintaining environmental hygiene when removing screws, and achieving safe and efficient work easily and economically. can do.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a schematic configuration of a main part showing an embodiment of an automatic screwdriver provided with a removing screw collecting means according to the present invention.

FIGS. 2A and 2B show an operation state of a bit attachment of an automatic screwdriver having a removing screw collecting means shown in FIG. 1, wherein FIG. 2A is an enlarged sectional view of a main part showing a removing state of a screw; () Is a main part enlarged sectional view showing a state immediately after the screw is removed, and (c) is a main part enlarged sectional view showing a state where the removed screw is recovered.

FIG. 3 is a schematic diagram illustrating a main part of a modified example of an automatic screwdriver provided with a removing screw collecting means according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gripping part 12 Bit holding part 14 Bit 14a Tip blade part 16 Bit guide hole 18 Bit attachment 20 Connecting member 22 Screw storage part 24 Tapered step part (locking part) 26 Screw mounting object 28 Screw recovery passage 30 Vacuum pipe 32 Screw recovery case 34 Vacuum pump 36 Compression coil spring 38 Actuator S Screw

Claims (6)

[Claims] A bit guide hole for guiding and inserting a bit is provided at a tip end portion of a bit that is rotationally driven in an electric screwdriver or the like, and a screw housing portion capable of housing a removal screw is provided at the tip end opening portion of the bit guide hole. And a member for separating the tip blade portion of the bit from a bit fitting groove formed in the head by contacting a part of the head of the removal screw when the removal screw is stored in the screw storage portion. A bit attachment provided with a stop portion, and further provided with a screw attachment passage branching from the bit guide hole for collecting a removal screw separated from the bit. Automatic screwdriver. 2. The screw guide according to claim 1, wherein the diameter of the screw storage portion formed at the distal end opening of the bit guide hole is set larger than the diameter of the bit guide hole, and the boundary between the bit guide hole and the screw storage portion is tapered. 2. The screw collecting passage according to claim 1, wherein said screw collecting passage is formed along a tapered step at said boundary portion. An automatic screwdriver with a means for collecting removal screws. 3. A bit holding portion of an automatic screwdriver and a bit attachment are connected to each other by a connecting member having a predetermined length in order to define a maximum retreat position of a tip end portion of a bit guided and inserted into a bit guide hole. An automatic screwdriver having a removing screw collecting means according to claim 1. 4. An automatic screwdriver between a bit holding portion and a bit attachment for moving a tip end portion of a bit guided and inserted into a bit guide hole to an open end of a screw storage portion of the bit attachment and waiting. 2. The automatic screwdriver as claimed in claim 1, wherein said screwdriver is provided with a means for collecting a removal screw. 5. A compression coil spring is provided between the bit holding portion of the automatic screwdriver and the bit attachment to resiliently retract the leading edge portion of the bit guided and inserted into the bit guide hole. 4. An automatic screwdriver comprising the removing means according to claim 4. 6. The automatic screwdriver according to claim 1, wherein the screw collecting passage is connected to the screw collecting case via a vacuum pipe.