JP2007105835A - Electric screwdriver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and easily exchange a bit during working and further improve working efficiency and workability. <P>SOLUTION: In an electric screwdriver 1 equipped with at least an attachment/detachment mechanism part 2 attaching/detaching the bit B, and an electric drive part 3 rotating the attachment/detachment part 2 by an electric operation, the attachment/detachment mechanism part 2 is equipped with a chuck mechanism part 5 holding the bit B when the bit B is inserted, a hold release mechanism part 6 releasing the holding of the bit B with the chuck mechanism 5 by being displaced, and a push-out mechanism part 7 pushing out the bit B to the forward Ff when releasing the holding of the bit B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an attachment / detachment mechanism portion to / from which a bit is attached / detached and an electric driver including an electric drive portion that electrically rotates the attachment / detachment mechanism portion.

  2. Description of the Related Art Conventionally, there are a wide variety of electric drivers in which an arbitrary bit selected from a plurality of different bits (driver bits) formed separately is mounted on the main body and the bit is rotated by the power of a motor or the like built in the main body Are known.

For example, in Japanese Patent Laid-Open No. 2001-62745, power is transmitted from the electric motor to the bit holder when the tightening torque reaches a predetermined value, which is interposed between the output portion of the electric motor and the bit holder that holds the bit. A clutch mechanism that operates to shut off, and a brake detection unit that stops the rotation of the electric motor by detecting the moving position of the movable member that is pressed and moved when the tightening torque in the clutch mechanism reaches a predetermined value. The brake detection means is disposed adjacent to a brake detected body provided on the movable side member and at a position facing the brake detected body when the movable side member is moved by the operation of the clutch mechanism. This is a non-contact detection of the braked object to be detected, shuts off the power supply to the electric motor, and applies power generation braking to the electric motor. Constituted electric power driver is disclosed by the brake position detection device that outputs an over key signal.
JP 2001-62745 A

  By the way, in the case of the conventional electric driver described above, when the bit is mounted on the main body, it can be mounted with one touch only by inserting the bit into the mounting hole of the main body. However, when removing the bit from the main body, it is usually necessary to displace the operating cylinder and pull out the bit from the main body while releasing the holding of the bit. there were. In other words, in the case of a conventional electric driver, since it is necessary to perform both the operation of displacing the operation tube portion and the operation of pulling out the bit together, the electric driver (main body portion) needs to be placed on a stand or the like In particular, the bits cannot be exchanged quickly and easily during work, and the work efficiency and workability are reduced.

  An object of the present invention is to provide an electric driver that solves the problems in the background art.

  In order to solve the above-described problems, the present invention provides at least an attaching / detaching mechanism when the electric driver 1 including the attaching / detaching mechanism portion 2 to which the bit B is attached / detached and the electric drive portion 3 that electrically rotates the attaching / detaching mechanism portion 2 is provided. A chuck mechanism 5 that holds the bit B when the bit B is inserted, a holding release mechanism 6 that releases the holding of the bit B by the chuck mechanism 5 by being displaced, and a holding of the bit B It is characterized by comprising an extruding mechanism portion 7 that pushes the bit B forward Ff when the is released.

  In this case, according to a preferred aspect of the invention, the chuck mechanism portion 5 is supported so as to be displaceable in the holding cylinder portion 10 having the insertion hole 10s into which the bit B is inserted, and the radial direction Fd of the holding barrel portion 10, And a predetermined interval in the circumferential direction Fs so as to be displaced to a locking position Xs for locking in the recesses Bsa and Bsb provided in the bit B inserted into the insertion hole 10s or a locking releasing position Xr for releasing the locking. Can be configured to include a stopper mechanism portion 14a having a plurality of ball members 11a, 12a,. The stopper mechanism portions 14a and 14b can be disposed at two different positions in the axial direction Fa in the holding cylinder portion 10. On the other hand, the holding release mechanism section 6 is slidably loaded on the outer peripheral surface of the holding cylinder body section 10 and is moved to a holding position Xh for holding the bit B or a holding release position Xi for releasing the holding, The operation member 15 is urged toward the holding position Xh, and the ball member 11a, 12a, 13a, etc. are locked at the holding position Xh by providing the spring member 16 on the inner peripheral surface of the operation tube 15. Convex portions 15a and 15b that are restricted to Xs can be provided. Further, the push-out mechanism portion 7 can be configured to include a contact member 17 that contacts the rear end portion Br of the bit B and a spring member 18 that pushes the contact member 17 forward Ff.

  The electric driver 1 according to the present invention having such a configuration has the following remarkable effects.

  (1) When removing the bit B from the main body, the bit B is pushed forward Ff by the push-out mechanism 7 by releasing the holding of the bit B by the holding-release mechanism 6, so that the bit B can be held with one hand. The operation of removing can be performed, and the bit B can be exchanged quickly and easily during work, and can contribute to further improvement in work efficiency and workability.

  (2) According to a preferred embodiment, the chuck mechanism portion 5 is supported by the holding cylinder body portion 10 having the insertion hole 10s into which the bit B is inserted and the radial direction Fd of the holding cylinder portion 10 so as to be displaceable and inserted. At a predetermined interval in the circumferential direction Fs so as to be displaced to a locking position Xs for locking in the recesses Bsa and Bsb provided in the bit B inserted into the hole 10s or a locking releasing position Xr for releasing the locking. If provided with a stopper mechanism portion 14a having a plurality of ball members 11a disposed, it can be implemented easily and at low cost by modifying an existing mechanism.

  (3) If the stopper mechanism portions 14a and 14b are arranged at two different positions in the axial direction Fa in the holding cylindrical body portion 10 according to a preferred aspect, it is possible to deal with various bits B ... and more versatility. Can be increased.

  (4) According to a preferred embodiment, the holding release mechanism 6 is slidably loaded on the outer peripheral surface of the holding cylinder body 10 and is displaced to the holding position Xh for holding the bit B or the holding release position Xi for releasing the holding. The operating cylinder 15 to be moved, the spring member 16 for urging the operating cylinder 15 toward the holding position Xh, and the ball member 11a at the holding position Xh by being provided on the inner peripheral surface of the operating cylinder 15. If the projections 15a and 15b that are restricted to Xs are provided, the existing mechanism can be modified easily and at low cost.

  (5) According to a preferred aspect, if the push-out mechanism section 7 includes a contact member 17 that contacts the rear end portion Br of the bit B and a spring member 18 that pushes the contact member 17 forward Ff, It can be implemented easily and at low cost by modifying an existing mechanism.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of the electric driver 1 according to the present embodiment will be described with reference to FIGS.

  FIG. 2 shows an external side view of the electric driver 1. Reference numeral 21 denotes a main body portion of the electric driver 1, and a bit (driver bit) B formed separately from the main body portion 21 can be attached and detached. The main body portion 21 has a housing portion 22 that covers the whole, a main body main portion 23 that incorporates an electric drive unit 3 (FIG. 1) including a motor, and a grip portion 24 that extends downward from the main body main portion 23. The battery mounting portion 25 provided at the lower end of the grip portion 24 and the power switch 26 disposed at the upper front end of the grip portion 24 are provided. The attachment / detachment mechanism 2 protrudes from the front end of the main body 23, and the bit B is attached / detached to / from the attachment / detachment mechanism 2, and the attachment / detachment mechanism 2 is rotated by the power of the electric drive unit 3.

  On the other hand, the bit B is integrally formed as a hexagonal bar as shown in FIGS. 1 and 3, and has different types of bit portions Bp and Bq at both ends. In addition, ring groove-shaped recesses Bsa and Bsb are formed in the circumferential direction Fs at two positions in the vicinity of the bit part Bq. Similar concave portions Bsa and Bsb are formed at two positions in the vicinity of the other bit portion Bp.

  The attachment / detachment mechanism 2 in the main body 22 constitutes a main part of the present invention. As shown in FIG. 1, the chuck mechanism 5 that holds the bit B when the bit B is inserted and the chuck mechanism by being displaced. A holding release mechanism unit 6 that releases the holding of the bit B by the unit 5 and an extrusion mechanism unit 7 that pushes the bit B forward Ff when the holding of the bit B is released are provided.

  The chuck mechanism portion 5 includes a holding cylinder portion 10 having an insertion hole 10s into which the bit B is inserted. The cross section of the insertion hole 10s is formed in a hexagon that substantially matches the cross sectional shape of the bit B. Further, the chuck mechanism portion 5 is supported so as to be displaceable in the radial direction Fd of the holding cylinder body portion 10, and is locked to the recesses Bsa and Bsb provided in the bit B inserted into the insertion hole 10s. Alternatively, a stopper mechanism portion 14a... Having a plurality of ball members 11a,..., 13a... Arranged at predetermined intervals in the circumferential direction Fs so as to be displaced to the unlocking position Xr where the locking is released. In this case, stopper mechanism parts 14a and 14b are provided at two positions in the holding cylinder part 10 in different axial directions Fa, respectively. Thus, if the stopper mechanism parts 14a and 14b are provided at two different positions in the axial direction Fa in the holding cylinder part 10, it is possible to deal with various bits B, and there is an advantage that versatility can be further improved. is there.

  As shown in FIG. 3, one stopper mechanism portion 14 a has three guide holes 31 a, 32 a, 33 a that penetrate in the radial direction Fd of the holding cylinder body portion 10 with respect to the circumferential direction Fs of the holding cylinder portion 10. The ball members 11a, 12a, and 13a are accommodated in the guide holes 31a, 32a, and 33a, respectively. The other stopper mechanism portion 14b is configured in the same manner as the one stopper mechanism portion 14a. In this case, the configurations of the stopper mechanism portions 14a and 14b may be the same or different. When different, the quantity of the ball members 11a, 11b, the position in the circumferential direction Fs, and the like can be made different. In addition, at least on the inner peripheral surface side of the guide holes 31a, 32a, 33a in the stopper mechanism portion 14a, a restriction piece 31s for restricting the ball members 11a, 12a, 13a from entering more than necessary with respect to the insertion hole 10s. , 32s... (See FIG. 5).

  The holding release mechanism 6 includes an operation cylinder 15 that is slidably loaded on the outer peripheral surface of the holding cylinder 10 and is displaced to a holding position Xh for holding the bit B or a holding release position Xi for releasing the holding. The operation cylinder portion 15 is formed in a cylindrical shape, and is provided with a non-slip uneven portion 35 shown in FIG. 2 on the outer peripheral surface, and a stopper portion capable of contacting the end surface of the holding cylinder portion 10 at the front end. 36 is integrally formed. In addition, ring-shaped convex portions 15a and 15b facing the openings of the guide holes 31a..., 32a..., 33a at the holding position Xh are provided along the circumferential direction Fs. Therefore, when the operation cylinder portion 15 is displaced to the holding position Xh, the convex portions 15a and 15b face the openings on the outer peripheral surface side of the respective guide holes 31a, so that the ball members 11a are engaged with the locking positions Xs. When the operation cylinder portion 15 is displaced to the holding release position Xi, the bit B is separated from the opening on the outer peripheral surface side of each guide hole 31a. Displacement to the unlocking position Xr is allowed. Further, a spring member 16 is interposed between the outer peripheral surface of the holding cylinder body 10 and the inner peripheral surface of the operation cylinder portion 15 to urge the operation cylinder portion 15 toward the holding position Xh.

  The push-out mechanism portion 7 includes a contact member 17 that contacts the rear end portion Br of the bit B and a spring member 18 that pushes the contact member 17 forward Ff. As shown in FIG. 4, the abutting member 17 includes a cylindrical abutting member main body portion 17m, a large-diameter stopper portion 17s integrally formed on the outer peripheral surface of the rear end, and the abutting member main body portion 17m. The front end surface is formed by a concave tapered surface, and has a contact surface 17t with which the rear end portion Br of the bit B abuts, and a spring member accommodating recess 17i formed in the axial direction from the rear end surface of the contact member main body portion 17m. Therefore, a contact member accommodating portion 38 that accommodates the abutting member 17 is formed at the rear end of the holding cylindrical body portion 10, and the abutting member 17 and the abutting member 17 are formed in the abutting member accommodating portion 38. The spring member 18 that urges the front Ff toward the front is accommodated. The rear end opening of the contact member accommodating portion 38 is closed by the lid member 39. As a result, the spring member 18 is interposed between the spring member accommodating recess 17i and the lid member 39 in the contact member 17 in a compressed state, and the contact member 17 in the natural state is shown in FIG. The stopper portion 17s is locked to the holding cylinder portion 10 side at a position where the opening on the inner peripheral surface side of the guide holes 31a is closed, and the position is regulated. In addition, 41 is a joint part integrally formed at the rear end of the holding cylinder part 10, and the rotation output part of the electric drive part 3 is connected to the joint part 41.

  Next, functions and operations of the electric driver 1 according to the present embodiment will be described with reference to FIGS.

  First, the bit B is attached to the main body 21. FIG. 5 shows a state in which the bit B is not attached in the attaching / detaching mechanism portion 2, and the contact member 17 is urged forward Ff by the spring member 18 and is locked to the holding cylinder portion 10 at the most advanced position. is there. In this case, since the opening on the inner peripheral surface side of each guide hole 31a in the rear stopper mechanism portion 14b is closed by the contact member 17, each ball member 11b is positioned at the locking release position Xr. The ball members 11a of the front stopper mechanism portion 14a are in a state of being freely displaceable to the unlocking position Xr while being regulated by the regulating pieces 31s. Therefore, since the rearward displacement of the convex portion 15b of the operation tube portion 15 is restricted by the ball members 11b of the rear stopper mechanism portion 14b, the operation tube portion 15 is held at the holding release position Xi. .

  In this state, the bit B can be directly inserted into the insertion hole 10s. FIG. 6 shows the bit B being inserted. The bit B enters the insertion hole 10s rearward, and the rear end portion Br comes into contact with the contact surface 17t of the contact member 17, so that the contact member 17 moves backward against the urging force of the spring member 18. Let

  As shown in FIG. 1, when the recesses Bsa of the bit B face the openings of the guide holes 31a, the ball members 11a are displaced to the locking position Xs, that is, enter the recesses Bsa. The position of the bit B in the axial direction is held (fixed). In this case, since the operation cylinder portion 15 is urged rearward by the spring member 16, if the rear concave portion Bsb faces the opening of the guide hole 31b, the ball member 11b is formed by the rear convex portion 15b. ... is pushed and displaced to the locking position Xs, and the operation cylinder portion 15 is displaced to the holding position Xh shown in FIG. At this time, the bit B stops in a click manner. Further, since the front convex portion 15a also faces the opening of the guide hole 31a, the position of the ball members 11a is restricted to the locking position Xs. Therefore, the bit B is held by the attaching / detaching mechanism unit 2, and the bit B can be attached with one touch. FIG. 1 shows this state.

  Accordingly, when the power switch 26 is pushed by hand, the power is turned on, and the electric drive unit 3 is operated, whereby the attachment / detachment mechanism unit 2 is rotated. And the bit B hold | maintained at this attachment / detachment mechanism part 2 rotates, and the electric driver 1 can be used. In addition, the rotation direction (forward rotation direction or reverse rotation direction) of the electric drive unit 3 (bit B) can be switched by a changeover switch (not shown).

  On the other hand, bit B is exchanged as follows. First, as shown in FIG. 7, the main body part 21 (grip part 24) is held with one hand (not shown), and the operation cylinder part 15 is pulled to the front Ff with the other hand Hr. As a result, the operation cylinder portion 15 is displaced to the holding release position Xi, the convex portions 15a are separated from the guide holes 31a, and the ball members 11a are allowed to be displaced to the locking release position Xr. It becomes. As a result, the bit B can also be displaced forward Ff. At this time, the rear end portion Br of the bit B is in contact with the contact member 17 in the push-out mechanism portion 7, and the contact member 17 is urged by the spring member 18, so that the push-out mechanism portion 7 Bit B is pushed forward Ff. FIG. 7 shows this state. In the state where the bit B is pushed out, the contact member 17 is located at the most advanced position, so that the operation cylinder portion 15 is held at the holding release position Xi like the unattached attachment / detachment mechanism portion 2 shown in FIG. Held (fixed).

  Therefore, the bit B can be extracted as it is in this state. That is, the bit B can be removed from the attachment / detachment mechanism 2 only with the other hand Hr. Further, the new bit B to be exchanged can be attached to the attachment / detachment mechanism portion 2 with one touch according to the procedure for attaching the bit B described above.

  As described above, according to the electric driver 1 according to the present embodiment, when the bit B is removed from the main body portion 21, the holding release mechanism portion 6 releases the holding of the bit B, whereby the pushing mechanism portion 7 releases the bit B. Since B is pushed forward Ff, it is possible to remove the bit B with one hand, so that the bit B can be replaced quickly and easily during work, and the work efficiency and workability can be further improved. Can contribute.

  In particular, the chuck mechanism portion 5 is supported by a holding cylinder portion 10 having an insertion hole 10s into which the bit B is inserted, and can be displaced in the radial direction Fd of the holding cylinder portion 10, and is inserted into the insertion hole 10s. A plurality of ball members arranged at predetermined intervals in the circumferential direction Fs so as to be displaced to a locking position Xs for locking in the recesses Bsa and Bsb provided in the bit B or a locking release position Xr for releasing the locking. The holding mechanism release mechanism 6 is slidably loaded on the outer peripheral surface of the holding cylinder 10 and holds the bit B, or releases the holding. The operation tube portion 15 that is displaced to the holding release position Xi, the spring member 16 that biases the operation tube portion 15 toward the holding position Xh, and the ball at the holding position Xh are provided on the inner peripheral surface of the operation tube portion 15. Member 11a Is formed by convex portions 15a, 15b that restrict the engagement position Xs, and the push-out mechanism 7 pushes the abutting member 17 in contact with the rear end Br of the bit B and the abutting member 17 to the front Ff. Since the spring member 18 is used, there is an advantage that it can be implemented easily and at low cost by modifying an existing mechanism.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in the detailed configuration, shape, material, quantity, and the like. It can be changed, added, or deleted arbitrarily.

  For example, in the configuration of the electric driver 1, the battery type is illustrated as the power source of the electric driving unit 3, but it may be a type that is directly driven by an AC power source. On the other hand, the stopper mechanism portions 14a and 14b are shown as being disposed in a pair on the front and rear sides. Moreover, although the ball member 11a ... in each stopper mechanism part 14a ... showed the case where the three ball members 11a ... corresponding to the hexagon of the bit B was used, two ball members 11a ... or four or more balls are shown. The case where the members 11a are used is not excluded. Therefore, the bit B can be similarly applied to other shapes such as a square as well as a hexagon. In addition, the chuck mechanism unit 5, the holding release mechanism unit 6, the extrusion mechanism unit 7 and the like are not limited to the illustrated configuration, and can be replaced by other configurations having the same function. The bit is a concept including not only a driver bit but also various bits such as a drill and a drill.

Sectional side view which shows the principal part of the electric driver which concerns on the best embodiment of this invention, External side view of the electric driver, A cross-sectional front view of the stopper mechanism portion of the attachment / detachment mechanism portion in the electric driver, A partial cross-sectional side view of the contact member in the electric driver, A cross-sectional side view showing the detachable mechanism portion of the electric screwdriver in a state where the bit is not attached, Sectional side view showing the detachable mechanism part in the middle of inserting the bit in the electric driver, A cross-sectional side view of the main part showing a state when the bit in the electric driver is removed from the attaching / detaching mechanism part,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric driver 2 Attachment / detachment mechanism part 3 Electric drive part 5 Chuck mechanism part 6 Holding release mechanism part 7 Extrusion mechanism part 10 Holding cylinder part 10s Insertion hole 11a ... Ball member 12a ... Ball member 13a ... Ball member 14a ... Stopper mechanism part 15 Operation cylinder 16 Spring member 17 Contact member 18 Spring member Ff Front Fd Radial direction Fs Circumferential Fa Axial direction Bsa Recessed Bsb Recessed Xs Locking position Xr Locking release position Xh Holding position Xi Holding release position

Claims (5)

  At least an attachment / detachment mechanism portion for attaching / detaching the bit and an electric driver including an electric drive portion for electrically rotating the attachment / detachment mechanism portion, wherein the attachment / detachment mechanism portion includes a chuck mechanism portion for holding the bit when the bit is inserted, An electric driver comprising: a holding release mechanism that releases the holding of the bit by the chuck mechanism by being displaced; and an extrusion mechanism that pushes the bit forward when the holding of the bit is released.   The chuck mechanism includes a holding cylinder portion having an insertion hole for inserting a bit, and a recess provided in the bit inserted into the insertion hole, which is supported so as to be displaceable in a radial direction of the holding cylinder portion. And a stopper mechanism having a plurality of ball members arranged at predetermined intervals in the circumferential direction so as to be displaced to a locking position for locking to a locking position or a locking releasing position for releasing the locking. Item 1. The electric driver according to Item 1.   The electric driver according to claim 2, wherein the stopper mechanism portion is disposed at two different positions in the axial direction of the holding cylinder portion.   The holding release mechanism section is slidably loaded on the outer peripheral surface of the holding cylinder body section, and an operation cylinder section that is displaced to a holding position for holding the bit or a holding release position for releasing the holding, and the operation cylinder section. 3. A spring member for urging the holding position side, and a convex portion for restricting the ball member to a locking position at the holding position by being provided on an inner peripheral surface of the operation tube portion. The described electric screwdriver.   2. The electric driver according to claim 1, wherein the push-out mechanism includes a contact member that contacts the rear end portion of the bit and a spring member that pushes the contact member forward.

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