JP2006305664A - Bit holder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new bit holder device, that can be safely, easily, and instantaneously inserted/removed to a bit used in a power tool. <P>SOLUTION: This bit holder device 5 is provided with a bit holder main body 10, a rolling element 30, and a sleeve 20. In the sleeve 20 facing a slit 12, a first recess 22, a second recess 23, and a projection 24 are formed. On the bit holder main body 10, a strip-shaped elastic member 15 is provided to be wound arpond a position opposing to the second recess 23. The strip-shaped elastic member 15 closes a range of the slit 12 opposing to the second recess 23 when the rolling element 30 is on the bit insertion port side of the slit 12. When the rolling element 30 is moved toward the bit insertion depth side of the slit 12, it is pressed by the rolling element 30 to be housed in the second recess 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of a bit holder device that can be installed on a bit used in a power tool.

  In general, when a plurality of operations are performed using one electric tool, it is convenient to use a bit holder device. For example, if a driver bit is attached to the electric tool, a screw tightening operation can be performed, and if a bit holder device having a drill attached to the driver bit is attached, a drilling operation can be performed. In a work environment where the screw tightening operation and the hole drilling operation are frequently switched, the bit holder device is frequently attached and detached.

  As conventional bit holder devices, for example, those described in Patent Documents 1 and 2 below are known. First, as shown in FIG. 6, the bit holder device described in Patent Document 1 is provided with a slide lock 102 and a ring spring 103 on both sides of a hollow shaft 101 corresponding to the driver bit 100, and a drill 104, a driver bit 100, Can be connected. When the bit holder device is attached to the driver bit 100, if the driver bit 100 is inserted into the engagement hole while the slide lock 102 is held, the tip of the driver bit 100 interferes with the steel ball 105, and the reaction force thereof. Since the slide lock 102 moves to the driver bit 100 side, the steel ball 105 can move in the outer peripheral direction, and the driver bit 100 is inserted and fixed to a predetermined position.

  Patent Document 2 below discloses a bit holder device for directly attaching a bit to an electric tool. Also in this bit holder device, the bit can be attached only by inserting the bit into the bit holder device installed in the electric power tool body.

  As other prior art documents related to the technical field to which the present invention belongs, for example, there are Patent Documents 3 and 4 below.

JP-A-9-277135 JP 2000-218412 A Japanese Patent No. 2698026 Japanese Utility Model Publication No. 7-15734

  However, in the bit holder device described in Patent Document 1, when the driver bit 100 is removed, the hollow shaft 101 must be pulled out in the opposite direction to the driver bit 100 with the slide lock 102 moved to the driver bit 100 side. Therefore, the operability is very poor.

  In addition, in the bit holder device described in Patent Document 2, when removing the bit, the bit cannot be removed unless the sleeve is moved in a direction opposite to the direction in which the bit is removed. As with the bit holder device described in No. 1, the user is forced to perform a very inconvenient operation.

  Further, prior art documents related to the bit holder device such as Patent Documents 3 and 4 above were investigated, but a bit holder device with good operability could not be found.

  The present invention has been made in view of the above-described problems, and provides a new bit holder device that can be inserted into and removed from a bit used in a power tool safely, easily, and instantaneously. It is intended to do.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis, However, This invention is not limited to the form of illustration.

  The bit holder device (5) according to the present invention includes a bit insertion hole (11) and a long hole (12) extending in the insertion / extraction direction of the bit (40) in a part of the bit insertion hole (11). A bit holder main body (10), a rolling element (30) movably installed along the long hole (12), and an outer periphery of the bit holder main body (10) via an elastic member (21). The elastic member (21) is slidable in a state of covering the elongated hole (12) and the rolling element (30) by an elastic force exerted in a direction substantially parallel to the insertion / extraction direction of the bit (40). A bit holder device (5) having a sleeve (20), wherein the sleeve (20) is positioned at a position facing the elongated hole (12) on the bit insertion port side of the elongated hole (12). The outer periphery of the rolling element (30) A first recess (22) that allows movement in the direction, and a second recess (23 that allows movement of the rolling element (30) in the elongated hole (12) in the bit insertion back side in the outer circumferential direction. ) And a convex portion (24) that is located between the first concave portion (22) and the second concave portion (23) and restricts movement of the rolling element (30) in the outer circumferential direction. In addition, the bit holder body (10) is provided with a band-shaped elastic member (15) wound around a position facing the second recess (23), and the band-shaped elastic member (15) When the rolling element (30) is on the bit insertion opening side in the elongated hole (12), the region facing the second recess (23) in the elongated hole (12) is closed, and the rolling element ( When 30) moves to the bit insertion back side in the long hole (12) , Said rolling element (30) being received in the second recess (23) in by being pressed in, characterized by.

  In the bit holder device (5) according to the present invention, it is preferable that the rolling element (30) is configured as a metal steel ball (30).

  Furthermore, in the bit holder device (5) according to the present invention, the hole width in the direction perpendicular to the insertion / extraction direction of the bit (40) in the long hole (12) is smaller than the diameter of the steel ball (30). Can be configured.

  Furthermore, in the bit holder device (5) according to the present invention, at least the surface of the sleeve (20) may be formed of a heat insulating member.

  The summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the new bit holder apparatus which can be inserted / extracted safely and easily and with respect to the bit used for an electric tool.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  FIG. 1A is a longitudinal sectional side view for explaining the structure of the bit holder device according to the present embodiment, and FIG. 1B is a lateral sectional side view of the bit holder device according to the present embodiment. Moreover, FIG. 1C is a figure which shows the AA cross section in FIG. 1B, and FIG. 1D is a figure which shows the BB cross section in FIG. 1C. The term “bit” in this specification includes all tools such as a driver bit used for an electric power tool, and the cutting edge shape is also + (plus) type, − (minus) type, hexa type All types are included.

  The bit holder device 5 according to the present embodiment includes, as basic components, a bit holder main body 10 including a bit insertion hole 11, a sleeve 20 installed on the outer periphery of the bit holder main body 10 via an elastic member 21, A steel ball 30 is provided between the bit holder body 10 and the sleeve 20 so as to be able to roll and move.

  The bit holder body 10 is a member formed in a substantially cylindrical shape, and includes a bit insertion hole 11 on one end side thereof. Since the bit holder device 5 according to the present embodiment assumes the insertion and removal of a driver bit having a hexagonal cross section, the cross sectional shape of the bit insertion hole 11 is also formed in a hexagonal shape. However, this cross-sectional shape can be arbitrarily changed in accordance with the shape of the bit to be inserted / extracted.

  A long hole 12 extending in the bit insertion / extraction direction is formed in a part of the bit insertion hole 11. A steel ball 30 that plays a role of fixing a bit is installed in the long hole 12 so as to be able to roll and move, and can move along the long hole 12. In particular, the long hole 12 is set so that the hole width in the direction orthogonal to the bit insertion / extraction direction (the vertical direction in FIG. 1A) is smaller than the diameter of the steel ball 30. Therefore, the steel ball 30 is installed in a state where a part of the steel ball 30 protrudes from the long hole 12 into the bit insertion hole 11. The amount of protrusion is set to an amount that fits into the bit fixing recess provided in the bit when the bit is inserted into the bit insertion hole 11.

  In addition, the attachment means 13 for drill drill installation is formed in the end side different from the side in which the bit insertion hole 11 of the bit holder main body 10 is formed.

  The steel ball 30 is a rolling element configured as a metal steel ball so as to receive a load from a bit that performs a screwing operation or the like. In general, it is desirable to use a steel material with high hardness such as bearing steel, tough steel, stainless steel, tool steel, etc., but any metal material can be applied depending on the application.

  The sleeve 20 is installed on the outer periphery of the bit holder body 10 via an elastic member 21, and covers the elongated hole 12 and the steel ball 30 by the elastic force that the elastic member 21 exerts in a direction substantially parallel to the insertion / extraction direction of the bit. It is a member that is slidable. With respect to the stroke of the slide movement in the sleeve 20, the stroke end on the back side of the bit insertion passes through the bit holder body 10, the retainer ring 31 and the washer 32 that engage with the groove formed on the outer periphery of the bit holder body 10. The stroke end on the bit insertion port side is defined by a locking structure portion 14 formed on the bit holder body 10. Therefore, the sleeve 20 is always pressed against the locking structure portion 14 by the elastic force of the elastic member 21, and can slide in the range of elastic deformation of the elastic member 21.

  Further, at a position facing the long hole 12 on the inner peripheral surface side of the sleeve 20, a first recess 22 that allows the steel ball 30 to move in the outer peripheral direction on the bit insertion port side in the long hole 12, and a long It is located between the second recess 23 that allows the steel ball 30 to move in the outer circumferential direction on the bit insertion back side in the hole 12, and between the first recess 22 and the second recess 23, And a convex portion 24 for restricting movement in the outer circumferential direction. The functions exhibited by the first concave portion 22, the second concave portion 23, and the convex portion 24 will be described later.

  The sleeve 20 is preferably formed of a steel material as a main body portion, and at least a surface portion thereof is formed of a heat insulating member such as resin or rubber. This is because the bit holder device 5 itself has heat when the bit holder device 5 is attached to the bit, and the user can use the heat insulating member made of resin, rubber, etc. 5 can be safely performed.

  Further, as a characteristic configuration of the bit holder device 5 according to the present embodiment, the bit holder main body 10 includes a belt-like elastic member 15 wound at a position facing the second recess 23. This belt-like elastic member 15 is obtained by winding a belt-like steel plate as shown in FIG. 2A into a coil shape as shown in FIG. 2B, and is applied to the force applied from the inner peripheral side to the outer peripheral side of the coil. This is a member that can exert an elastic force in the central direction.

  When the steel ball 30 is on the bit insertion opening side of the long hole 12, the belt-like elastic member 15 closes the region facing the second recess 23 in the long hole 12 (see FIGS. 1A to 1D). When the steel ball 30 moves to the bit insertion back side in the long hole 12, the steel ball 30 is configured to be stored in the second recess 23 by being pressed by the steel ball 30.

  The constituent members of the bit holder device 5 according to the present embodiment have been described above. Next, a specific operation of the bit holder device 5 according to the present embodiment will be described. Here, FIGS. 3A to 3G are views for explaining the operation of the bit holder device according to the present embodiment.

[Mounting operation]
First, the mounting operation will be described. When the bit holder device 5 is moved in the direction of the arrow indicated by the symbol α while the sleeve 20 is held and the driver bit 40 is fixed, the tip of the driver bit 40 inserted into the bit insertion hole 11 is moved to the steel ball 30. (Refer to the state of FIG. 3A).

  As the driver bit 40 is inserted, the tip inclined portion of the driver bit 40 pushes the steel ball 30, and the steel ball 30 moves to the bit insertion back side in the long hole 12. When the steel ball 30 moves in the insertion direction and the outer circumferential direction of the driver bit 40, the belt-like elastic member 15 is pushed out into the second recess 23, and a part of the steel ball 30 also enters into the second recess 23. Is stored, the driver bit 40 can be further advanced (see the state of FIG. 3B).

  When the driver bit 40 is further inserted into the bit insertion hole 11, the steel ball 30 falls into the recess 41 of the driver bit 40. At this time, since the belt-like elastic member 15 returns to the original position, the steel ball 30 is pressed and an elastic force is exerted in the holding direction. With the above operation, the mounting of the bit holder device 5 to the driver bit 40 is completed (see the state of FIG. 3C).

[Retention status]
Next, the holding state will be described. It is necessary for the bit holder device 5 to hold the driver bit 40 surely no matter what force is applied from the outside. This holding mechanism will be described with reference to FIG. 3D. In FIG. 3D, the case where work is performed using the drill drill 50 installed in the attachment means 13 is illustrated. In such a situation, if the drill drill 50 is to be pulled out during the drilling operation, the drill drill 50 may not easily come out of the workpiece due to resistance to the workpiece. At this time, the driver bit 40 is applied with a force for getting out of the bit holder device 5.

  When force is applied to the driver bit 40 in the direction of the arrow indicated by β, the steel ball 30 moves to the bit insertion opening side of the long hole 12 by the action of the recess 41 of the driver bit 40. At this time, a force that pushes the steel ball 30 in the outer circumferential direction is applied to the steel ball 30 by the action of the inclined surface of the recess 41, but the steel ball 30 is restricted from moving in the outer circumferential direction by the action of the convex portion 24 formed on the sleeve 20. Will be. The steel ball 30 whose movement in the outer circumferential direction is restricted remains in the recess 41. Therefore, the driver bit 40 does not come out of the bit holder device 5, and the holding state is maintained (see the state of FIG. 3D), and the drill bit 50 that has become difficult to come off from the workpiece is pulled out together with the driver bit 40. be able to.

[Desorption operation]
Finally, the desorption operation will be described. When removing the bit holder device 5 from the driver bit 40 attached to the electric tool, the sleeve 20 is moved in the same direction as the removal direction of the bit holder device 5 (the direction of the arrow indicated by γ) as shown in FIG. 3E. The elastic member 21 is further compressed from the state where the movement of the steel ball 30 in the outer peripheral direction is restricted, and the first concave portion 22 is positioned on the outer peripheral side of the steel ball 30. When the sleeve 20 is further moved in the direction of the arrow indicated by the symbol γ from this state, the steel ball 30 is lifted to the outer peripheral side by the action of the recess 41 and is stored in the first recess 22 (FIG. 3F). See state). When the state shown in FIG. 3F is reached, there is no restriction on the operation of the driver bit 40. Therefore, when the driver bit 40 is further pulled out, the driver bit 40 as shown in FIG. 3G is completely detached from the bit holder device 5. Become. At this time, the movement of the steel ball 30 in the direction of the bit insertion hole 11 is restricted by the locking portion 12a formed on the bit insertion hole 11 side of the long hole 12 as shown in FIG. It does n’t fall inside.

  The constituent members and operations of the bit holder device 5 according to this embodiment have been described above. In the bit holder device 5 according to the present embodiment, when the driver bit 40 is inserted into the bit insertion hole 11 during the mounting, the secure mounting is performed. Even if an external force is applied, a reliable mounting state is maintained. Further, when the sleeve 20 is detached, the sleeve 20 can be moved in the same direction as the removing direction of the bit holder device 5 to be easily detached. Therefore, according to the bit holder device 5 according to the present embodiment, the user can easily and instantaneously perform the insertion / extraction operation of the driver bit 40. Further, since at least the surface portion of the sleeve 20 with which the user contacts is formed by a heat insulating member such as resin or rubber, even if the bit holder device 5 becomes hot, the user can safely use the bit holder device 5. Desorption work can be performed. Therefore, according to the bit holder device 5 according to the present embodiment, the user can safely, easily and instantaneously perform the insertion / extraction operation of the driver bit 40 used in the electric tool.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, the bit holder device 5 according to the present embodiment has been described by exemplifying the case where the bit holder device 5 is attached to the driver bit 40 having a hexagonal cross section used in the electric tool illustrated in FIG. However, the application of the present invention is not limited to the form as shown in FIG. 4, and any tool type bit can be used. Further, any tool including the drill drill 50 can be used as the tool installed at the tip of the bit holder device 5.

  Furthermore, in the above-described embodiment, the case where the locking structure portion 14 formed in the bit holder body 10 is employed as the structure that defines the stroke end on the bit insertion port side of the sleeve 20 has been described as an example. However, for the structure that defines the stroke end of the sleeve 20 on the bit insertion opening side, for example, a locking member 60 as shown in FIG. 5 can be used. For the locking member 60, it is preferable to use a C-ring, an E-ring, or the like. By adopting such a configuration, the assembly work of the bit holder device 5 is facilitated, and the effect that the maintainability is improved can be exhibited.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

It is a longitudinal cross-sectional side view for demonstrating the structure of the bit holder apparatus which concerns on this embodiment. It is a cross-sectional side view of the bit holder apparatus which concerns on this embodiment. It is a figure which shows the AA cross section in FIG. 1B. It is a figure which shows the BB cross section in FIG. 1C. It is a figure for demonstrating the strip | belt-shaped elastic member which concerns on this embodiment. It is a figure for demonstrating the strip | belt-shaped elastic member which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure for demonstrating operation | movement of the bit holder apparatus which concerns on this embodiment. It is a figure which illustrates the application aspect of the bit holder apparatus which concerns on this embodiment. It is a figure which shows the modification of the various forms of the bit holder apparatus which concerns on this embodiment. It is a figure which illustrates the conventional bit holder apparatus.

Explanation of symbols

  5 Bit holder device, 10 Bit holder body, 11 Bit insertion hole, 12 Long hole, 12a Locking portion, 13 Mounting means, 14 Locking structure portion, 15 Strip elastic member, 20 Sleeve, 21 Elastic member, 22 First Concave, 23 Second Concave, 24 Convex, 30 Steel Ball, 31 Retainer Ring, 32 Washer, 40 Driver Bit, 41 Dimple, 50 Drill Kill, 60 Locking Member, 100 Driver Bit, 101 Hollow Shaft, 102 Slide Lock, 103 ring spring, 104 drill, 105 steel balls.

Claims (4)

A bit holder body provided with a bit insertion hole, and a long hole extending in a bit insertion / extraction direction in a part of the bit insertion hole,
A rolling element installed movably along the elongated hole;
It is installed on the outer periphery of the bit holder body via an elastic member, and is slidable in a state where the elastic member covers the elongated hole and the rolling element by an elastic force exerted in a direction substantially parallel to the insertion / extraction direction of the bit. And a sleeve
A bit holder device comprising:
At a position facing the elongated hole of the sleeve,
A first recess allowing movement of the rolling element in the outer peripheral direction on the bit insertion port side in the elongated hole;
A second recess allowing movement of the rolling element in the outer peripheral direction on the bit insertion back side in the elongated hole;
A convex portion that is located between the first concave portion and the second concave portion and restricts movement of the rolling element in the outer circumferential direction;
Is formed, and
In the bit holder main body, a belt-like elastic member wound around a position facing the second recess is installed,
The band-shaped elastic member is
When the rolling element is on the bit insertion port side in the elongated hole, the region facing the second recess in the elongated hole is closed,
When the rolling element moves to the bit insertion back side in the elongated hole, the rolling element is stored in the second recess by being pressed by the rolling element,
A bit holder device characterized by the above. The bit holder device according to claim 1,
The bit holder device, wherein the rolling element is configured as a metal steel ball. In the bit holder device according to claim 2,
The bit holder device according to claim 1, wherein a hole width in a direction perpendicular to the insertion / extraction direction of the bit in the long hole is smaller than a diameter of the steel ball. In the bit holder device according to any one of claims 1 to 3,
At least a surface of the sleeve is formed of a heat insulating member.

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