JP3143187U - Connecting / disconnecting structure to / from electric rotating tool mounting bit - Google Patents

Abstract

Provided is a connecting / disconnecting structure for an electric rotating tool mounting bit that smoothes mounting and unloading operations on a driver bit and causes no problem even if its stopper member is worn.
A connecting structure 10 is detachable from a tip of a driver bit 56 attached to an electric rotary tool. This connection structure 10 has a cylindrical connection portion 11, and a cut portion 11 k is provided obliquely from the outer periphery toward the axial direction. A stopper pin 15 is fitted to the notch 11k, and a coil spring 13 is provided on the distal end side adjacent to the pin 15 via a pressing ring 14, and the pin 15 is always urged in the proximal direction. An outer cylindrical body 12 is disposed on the outer periphery of the cylindrical connecting portion 11. As a result, the distal end portion of the driver bit 56 is forcibly inserted, and the coupling structure 10 is coupled to the bit. On the other hand, the distal end of the driver bit 56 is shifted from the connected state to the distal end side. The connection structure 10 is pulled out from.
[Selection] Figure 3

Description

The present invention relates to a connecting / disconnecting structure that is connected to and disengaged from a tip portion of a hexagonal axis driver bit or the like attached to a rotating shaft of an electric rotary tool such as an electric screwdriver / drill or an impact screwdriver.
This connection / disconnection structure can be applied as a connection / disconnection structure of a connection part such as a drill adapter connected to the tip of the hexagonal screwdriver bit or a connection drill for a pilot hole drill. In addition to the driver bit, the shaft has a prismatic shape and can be connected to and connected to a shaft portion in which an annular recess is formed at the tip portion.

As a conventional connecting / disconnecting structure to / from the electric rotary tool mounting bit, there is a device described in Patent Document 1 below.
The device disclosed in Patent Document 1 relates to a drill chuck mechanism for an electric screwdriver. In claim 4, an engagement / disengagement mechanism that is a structure for connecting and disconnecting an electric screwdriver to a driver bit is disclosed.

This fitting / removal mechanism has a fitting insertion hole into which a hexagonal screwdriver bit can be fitted on the base end side, and forms an inclined notch from the outer periphery to the fitting insertion hole. Protrusions that lock the tip end of the spring project at appropriate positions to lock the tip of the spring, and the other end (base end) of the spring is inserted into the inclined notch. The outer cylinder portion is inserted into the outer peripheral portion.
By shifting the outer cylindrical portion toward the distal end, a portion located in the inclined notch portion on the proximal end side of the spring can be pressed toward the distal end side, whereby the spring contracts and the spring in the notch portion moves upward. The drill bit is pulled out.

On the other hand, when attaching to the drill bit, the outer peripheral portion of the drill bit is notched by gripping the outer cylinder and operating the tip of the drill bit to be inserted into the insertion hole on the base end side. The spring in the section is pressed, the spring contracts, the base end of the spring in the notch moves upward, the drill bit tip is inserted into the insertion hole, and then formed on the drill bit tip The spring base end portion in the cutout portion fits (moves downward) in the annular concave portion, and this fitting / removing mechanism is mounted and fixed to the tip portion of the trill bit.
The fitting / removal mechanism described in this patent document is further provided with a collar portion, a spring pressing adjustment portion, and the like, and has a fairly complicated structure.
Utility Model Registration No. 3134807

In the above-described conventional connection structure, the configuration of the inclined cut portion (inclined cutout portion) and the stopper portion on the proximal end side of the coil spring introduced into the cut portion is one feature. It has become.
And it has the structure where the stopper site | part introduce | transduced in a notch part was integrally formed with the coil spring.
The stopper portion formed on the base end side of the coil spring is fitted to the annular recess formed at the tip of the hexagonal screwdriver bit attached to the rotary drive shaft of the electric rotary tool, or both are connected. Is configured so that its fit can be released and removed.

The most important thing in this type of connecting structure is that this connecting structure is securely connected and fixed to a drill bit or the like.
Then, after this connection structure is connected to a drill bit or the like, it is required that the connection structure never falls out.
Furthermore, the attachment / detachment operation needs to be performed more smoothly in the attachment / detachment operation, although it does not fall out. If the attachment / detachment operation is heavy, requires a force, and the stopper portion is caught in the annular recess of the driver bit, the product will be unsatisfactory.

From these viewpoints, if the conventional fitting / removing mechanism (connecting structure) is verified, it is necessary to naturally reduce the resilience (biasing force) of the coil spring in order to perform the attaching / detaching operation smoothly. In order to weaken the urging force of the coil spring, a metal wire having a small outer diameter that forms the coil spring must be used.
However, when the outer diameter of the coil spring wire is reduced, the outer diameter of the portion serving as the stopper portion on the base end side is naturally reduced and the strength becomes weak. This is because both are formed integrally using the same coil spring.

On the other hand, in order to increase the strength of the stopper portion (spring base end side), the outer diameter of the coil spring wire must be increased. Then, this time, the urging force of the coil spring increases, and the fitting of the fitting / removing mechanism to the driver bit becomes hard, and smooth attachment / detachment is impaired.
As an actual product, a coil spring made of a wire material having a small outer diameter of 0.8 mm is used in order to give priority to the smoothness of the attaching / detaching operation.
In this conventional product, there are many obstacles and problems in the engagement and locking of the coil spring proximal end with the annular recess at the tip of the driver bit.

That is, the stopper part on the spring base end side is caught in the annular recess of the bit or damaged by wear. This is because the contact between the stopper part and the annular recess is a one-point contact, and this one-point contact part repeatedly slides over and over again, so that the outer diameter of the stopper part is small or the strength is low. If it is weak, various problems and failures will occur.
In particular, if this engagement / disengagement mechanism falls out of the driver bit during use, the product will not be established.

On the other hand, even in the manufacturing process of this fitting / removal mechanism, the base end side stopper part of the integrated coil spring is introduced into the inclined notch, but this stopper part is distorted during this introduction. Will be introduced.
Due to this manufacturing process, the stopper portion on the base end side of the spring is distorted, and there is a problem that the spring cannot be properly disposed inside the cutout portion, that is, cannot be arranged substantially at right angles to the shaft core portion of the fitting / removing mechanism.
Therefore, when the attaching / detaching operation is actually performed on the finished product, although it can be performed satisfactorily, there is also a problem that defective products in which the attaching / detaching operation is not smooth come out.
However, even if the attaching / detaching operation is smooth, various problems resulting from the small outer diameter of the coil spring wire cannot be avoided.

In view of the above problems, the present invention has the following points to solve the above problems.
First of all, in the present invention, the connection structure is improved so that the mounting and unloading operations on the driver bit and the like can be performed very smoothly and smoothly.
In addition to the smooth attachment and detachment operation, the stopper member is engaged and locked well with the annular recess such as a bit, so that the stopper member can be easily engaged without being caught in the engagement and engagement operations. It is an object of the present invention to provide a device that does not break down and does not cause any problems even if it is worn.

  In order to solve the above-mentioned problem, the first one of the present invention is provided with an insertion hole portion into which a tip end portion of a bit such as a driver bit attached to a rotating shaft of an electric rotary tool can be inserted on the base end side. A cylindrical connecting portion, and a notch is formed obliquely from the outer periphery of the cylindrical connecting portion in the axial direction, and the inclination of the notched portion is such that the angle on the tip side with respect to the axial core is an acute angle. This notch is fitted with a rod-like stopper pin in the direction intersecting the axis, and an elastic member such as a coil spring is provided on the tip side adjacent to this pin. The elastic member always urges the pin in the proximal direction, and further, an outer cylindrical body is arranged on the outer periphery of the cylindrical connecting portion to cover the elastic member and the pin, and to connect the cylindrical member. Reciprocates in the longitudinal direction on the outer periphery of the outer part, and on the inner peripheral surface on the base end side of the outer cylindrical body. A pressing portion that can press the pin and the elastic member is provided. By the above configuration, a bit distal end portion such as a driver bit is forcibly inserted into the insertion hole portion on the proximal end side of the cylindrical connection portion. The pin is pressed in the tip direction and the elastic member is contracted to the tip side.As a result, the pin moves upward inside the notch, and the bit tip is inserted into the insertion hole, and then When the pin fits into the annular recess formed at the tip of the bit, the pin moves to the lowermost part inside the notch, and this state is maintained by the action of the urging force of the elastic member. The cylindrical connecting portion is connected and fixed to the distal end portion of the bit. On the other hand, by shifting the outer cylindrical body from the connected and fixed state to the distal end side, the proximal end portion of the outer cylindrical body is obtained. The pressing part provided on the side inner peripheral surface When the pin is pressed to the tip side and the elastic member is contracted, the pin moves upward in the notch, and the fit between the pin and the annular recess at the bit tip is released, and the cylindrical connecting portion A connecting / removing structure for an electric rotating tool mounting bit, wherein a tip end portion of a bit such as a driver bit is removed from an insertion hole portion.

  Here, the base end side means the side where the insertion hole portion into which the tip end portion of the driver bit attached to the rotating shaft of the electric rotary tool is inserted, and the tip end side is the above-mentioned This means the side opposite to the base end side, for example, the side on which a drill bit or the like for forming a prepared hole is provided. Hereinafter, it has the same meaning.

  According to a second aspect of the present invention, in the first aspect, a washer-shaped pressing ring is provided between the elastic member and the pin, and the urging force of the elastic member uniformly spreads over the entire pressing ring. This is a structure for connecting to and disconnecting from the electric rotary tool mounting bit.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, both ends of the pin are bent toward the axial center side at the outer peripheral surface of the cylindrical connecting portion, and bent portions are formed at both ends. In this structure, the contact portion between the elastic member or the pressing ring and the pin, and the contact portion between the pressing portion of the outer cylindrical body and the pin is made larger, and the connecting and detaching structure to the electric rotary tool mounting bit is provided. is there.

  According to a fourth aspect of the present invention, in the first to third aspects, a coil spring is used as the elastic member, and the outer diameter of the stopper pin is larger than the outer diameter of the wire forming the coil spring. This is a structure for connecting to and disconnecting from the electric rotary tool mounting bit, characterized in that a tool is used.

In the first device of the present invention, since the elastic member and the stopper pin are formed separately, the strength of the elastic member and the strength of the pin can be individually set.
Therefore, it is possible to select and use a resilient member having an appropriate biasing force, and a stopper pin having a suitably strong strength or a thicker outer diameter. .
As a result, the screwdriver bit can be connected very smoothly to the tip of the driver bit, and its connection / fixation can be made stronger and durable.

Furthermore, the strength of the stopper pin can be improved (with a higher hardness), or a larger diameter can be used, so that damage to the pin is suppressed and problems occur even if wear occurs. In addition, if the outer diameter of the pin is increased, the fitting or engagement with the annular recess at the tip of the driver bit becomes smoother, and even when the connecting structure according to the present invention is pulled out from the driver bit, it will be caught. Thus, smooth engagement / disengagement is possible.
This is because the area of the contact surface between both the pin and the annular recess is increased by making the pin have a large diameter.

The second device of the present invention also has the same effect as that of the first device. However, by providing a washer-shaped pressing ring between the elastic member and the pin, Since the urging force uniformly spreads over the entire pressing ring, the urging force of the elastic member can be more favorably applied to both ends of the pin.
On the other hand, also in the pressing operation to the pin by the pressing portion on the inner peripheral surface of the outer cylindrical body, the pressing operation to the elastic member of the pressing portion becomes smoother due to the intervention of the pressing ring.
As a result, the pin is more smoothly pressed in either direction toward the proximal side or the distal side.

  In the third aspect of the present invention, since the bent portions are provided at both ends of the stopper pin, the urging force of the elastic member against the both ends of the pin or the pressing force of the pressing portion of the outer cylindrical body Will be better transferred to the pin.

  In the fourth device of the present invention, as described above, by making the outer diameter of the pin larger than the outer diameter of the wire material of the coil spring as the elastic member, or using a hard material, By making the connecting structure attachment / detachment smoother and improving the strength of the pin, the engagement or fitting of the pin and the annular recess of the driver bit becomes smoother, and the pin is worn out without being caught. It is difficult to do so, and its adverse effects are extremely low, and damage is extremely low.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an embodiment in which a connecting / disconnecting structure (hereinafter referred to as “bit connecting structure”) to an electric rotating tool mounting bit according to an embodiment of the present invention is applied to the base side of an adapter, and a drill is provided on the tip side of the adapter. Is an explanatory diagram showing a state in which the base of the drill adapter is attached to a driver bit of an electric screwdriver as an electric rotary tool.
In FIG. 1, the drill adapter to which this bit connection structure is applied is drawn relatively larger than the size of the electric screwdriver.

The bit connection structure 10 according to the present invention is applied to the base end side B of the adapter D, for example. The structure will be described in detail with reference to the subsequent drawings.
A drill 20 for drilling a pilot hole is connected to the tip side T of the adapter D. This drill 20 is formed with a drill blade at its tip, and its root has a substantially hexagonal cross section.
An insertion hole portion 16 into which a distal end portion of a hexagonal screwdriver bit 56 attached to the rotational drive shaft of the electric screwdriver 50 is inserted is formed on the base end side end surface of the adapter D.

This adapter D is described in detail later by grasping the outer cylindrical body 12 of the connecting structure 10 with a finger, for example, with a thumb and forefinger, and inserting a driver bit 56 into the insertion hole 16. Connected and fixed.
On the other hand, when the adapter D is removed from the driver bit 56, the outer cylindrical body 12 is similarly grasped with, for example, the thumb and the index finger and pulled in the distal end direction T. The details will be described later. It has a structure that can be pulled out automatically.

FIG. 2 is an exploded explanatory view of the adapter D, and FIG. 3 is a side perspective explanatory view thereof. The connection structure according to the present invention will be described with reference to these drawings.
The connecting structure 10 according to the present invention includes a cylindrical connecting portion 11, an outer cylindrical body 12 disposed on the outer periphery thereof, a coil spring 13 disposed on the outer peripheral surface of the cylindrical connecting portion 11, and the coil spring 13. The pressing ring 14 is arranged on the base end side of the pressing ring, and the stopper pin 15 is arranged on the base end side of the pressing ring.
And this pin 15 is adapted and arranged inside the notch part 11k provided inclining obliquely in the axial direction from the outer periphery of the cylindrical connecting part 11.
Further, both ends of the pin 15 are bent at substantially right angles in the axial direction from the outer peripheral surface of the cylindrical connecting portion 11, and bent portions 15 f are respectively provided.

A step portion 11 s is formed on the distal end side of the cylindrical connection portion 11.
The tip end side (left side in FIG. 3) of the coil spring 13 comes into contact with the step portion 11s.
And the base end side (right side in FIG. 3) of this coil spring 13 can urge the just washer-shaped pressing ring 14, and this pressing ring 14 is the pin 15 for stoppers arrange | positioned inside the notch part 11k. Can be maintained in a pressed state.
As can be seen from FIG. 3, the coil spring 13 presses the pressing ring 14 and presses the pin 15 against the lowermost end of the cut portion 11k.

On the other hand, the outer cylindrical body 12 is inserted into the outer periphery of the cylindrical connecting portion 11.
A through hole is provided inside the outer cylindrical body 12, and the inner diameter of the opening 12 t on the tip side is slightly larger than the outer diameter of the pressing ring 14.
The inner diameter of the opening 12b on the base end side of the outer cylindrical body 12 is smaller than the outer diameter of the pressing ring 14, and a step is formed slightly inside the opening 12b on the base end side. . This step portion forms the pressing portion 18.
The pressing portion 18 functions when the connecting structure 10 according to the present invention is removed from the driver bit 56.

  That is, by pressing the outer cylindrical body 12 with a finger and moving it to the distal end side, the pressing portion 18 formed on the inner peripheral surface of the base end side of the through hole of the outer cylindrical body 12 is moved to the stopper pin and The pressing ring 14 is pressed, and as a result, the coil spring 13 also contracts in the distal direction, and the pin 15 moves upward along the inclination of the notch 11k. As a result, engagement or locking of the stopper pin 15 with the annular recess 55 of the driver bit 56 is released, and the drill adapter D can be removed from the driver bit 56.

In the connection structure 10 according to the present invention, the most important point is the attaching / detaching operation as described above.
That is, when the connection structure 10 is attached to the driver bit 56, the connection structure 10 is gripped and a force is applied in the proximal direction B. This direction is the same as the mounting direction as it is.
On the other hand, when the connection structure 10 is removed from the driver bit 56, the connection structure 10 is grasped and a force is applied in the distal direction T this time to remove the connection structure 10 from the driver bit 56. It can be removed. That is, the direction in which the force is applied and the removal direction are the same direction.

This point is completely different from the connection structure using a stopper ball (steel ball) that is currently commercially available.
In the case of using this commercially available stopper ball, when pulling out the connection structure, when the connection structure is pulled out, once the force is applied to the base end side in the reverse direction, the state is maintained, It can be removed from the driver bit. That is, the pulling direction and the direction in which the force is applied to the connecting structure are reversed.
This is due to the basic structure of the connecting structure using the stopper ball.
In this regard, it is only described that this is a very large difference between a pin used as a stopper and a steel ball used as a stopper, but details thereof are omitted.

  Finally, after the outer cylindrical body 12 is assembled to the cylindrical connecting portion 11, the outer cylindrical body 12 is connected to the cylindrical connection portion 11 by fitting the fixing ring 19 to the proximal end of the cylindrical connecting portion 11. It is assembled to the part 11 and assembled without separation.

Although the embodiment has been described above, various design changes can be made in the present invention as follows.
The connecting / disconnecting structure according to the present invention can be connected to a driver bit or other bit mounted on a rotary drive shaft of an electric rotary tool, and its shaft portion has a prismatic shape, and its tip portion. It can be easily attached to the one having an annular recess formed therein.
Further, the structure on the tip side of the connecting structure according to the present invention is completely free, and can be applied as a drill adapter to which the above drill is connected, or can be applied as a socket wrench by connecting a socket to the tip side. You can also. In this way, the structure on the tip side can be freely selected and set.

The inclination angle of the oblique cut portion provided in the cylindrical connection portion where the stopper pin is disposed may be an acute angle on the tip side formed with the shaft core. In FIG. 3, it is sufficient if the inclination angle is lower right. In the embodiment, the angle is about 45 degrees.
This is because, when the driver bit is inserted, the pin is pressed by the outer peripheral surface of the driver bit and can move obliquely upward inside the cut portion.
The coil spring as the elastic member may be longer than the distance between the tip side step portion of the cylindrical connecting portion and the bottom of the cut portion, that is, it may be in a state where the pressing ring and the pin can always be pressed and urged. .

The outer shape of the outer cylindrical body can be set freely. In short, if the pressing part is formed on the inner peripheral surface of the base end side of the through hole, and the pin and the pressing ring can be appropriately pressed, Good.
The pressure ring is most suitable for the washer shape. That is, the most suitable one is a donut-shaped annular ring body having flat end faces. This is because the flat surfaces of the both end faces can press the coil spring uniformly and well, and the pins and the bent portions at both ends of the pin can also be pushed well and uniformly.
In addition, this press ring can also be implemented without providing this.

The stopper pin can be implemented without providing bent portions at both ends as in the above embodiment, but it is desirable to provide this.
Because, if the bent portion is not formed at both ends of the pin, the both ends of the pin are in a point contact state, so-called a pressing ring, but by providing the bent portions at both ends, it becomes line contact, The ripple effect of the force on the pin and the pressing ring is improved better.
As described above, according to the present invention, the stopper pin is configured separately from the elastic member to improve the degree of freedom in designing the pin, and the pin is pressed very well by the elastic member, and the outer cylindrical body is provided. Thus, it is possible to provide a connecting / disconnecting structure that greatly simplifies the entire structure and that can be easily attached / detached to / from a driver bit such as an electric rotary tool.

It is explanatory drawing which shows the state which applies the connection removal structure to the electric rotary tool mounting bit which concerns on one Embodiment of this invention to a drill adapter, and mounts this adapter on an electric screwdriver. FIG. 2 is an exploded explanatory view of the drill adapter according to the embodiment of FIG. 1. It is side surface transparent explanatory drawing of the drill adapter which concerns on embodiment of FIG. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connection structure 11 Cylindrical connection part 11k Notch part 11s Step part 12 Outer cylindrical body 13 Coil spring 14 Press ring 15 Stopper pin 15f Bending part 16 Insertion hole part 18 Press part 55 Annular recessed part 56 Driver bit

Claims (4)

It has a cylindrical connection part (11) provided with an insertion hole part (16) into which a bit distal end part such as a driver bit mounted on the rotary shaft of the electric rotary tool can be inserted on the base end side,
A notch (11k) is formed obliquely from the outer periphery of the cylindrical connection part (11) in the axial direction, and the inclination of the notch (11k) is such that the angle on the tip side with respect to the axis is an acute angle. Formed to be
The notch (11k) is fitted with a rod-shaped stopper pin (15) in the direction intersecting the axis,
A resilient member such as a coil spring (13) is provided on the distal end side adjacent to the pin (15), and this resilient member is always biased in the proximal direction toward the pin (15),
Further, an outer cylindrical body (12) is disposed on the outer periphery of the cylindrical connection portion (11), covers the elastic member and the pin (15), and has a longitudinal length on the outer periphery of the cylindrical connection portion (11). Reciprocate in the direction,
A pressing portion (18) capable of pressing the pin (15) and the elastic member is provided on the inner peripheral surface on the proximal end side of the outer cylindrical body (12),
With the above configuration, the pin (15) can be inserted in the distal direction by forcibly inserting a bit distal end portion such as a driver bit into the insertion hole (16) on the proximal end side of the cylindrical connection portion (11). As a result, the elastic member is contracted to the tip side, and as a result, the pin (15) moves upward inside the notch (11k), and the bit tip is inserted into the insertion hole (16). And
Thereafter, the pin (15) fits into the annular recess formed at the tip of the bit, so that the pin (15) moves to the lowermost part inside the notch (11k), and the elastic member This state is maintained by the action of the urging force, and this cylindrical connecting portion (11) is connected and fixed to the tip of the bit,
On the other hand, the pressing portion (18) provided on the inner peripheral surface of the base end portion side of the outer cylindrical body (12) by shifting the outer cylindrical body (12) from the connected and fixed state to the distal end side. When the pin (15) is pressed toward the tip side and the elastic member is contracted, the pin (15) moves upward in the cut portion (11k), and the pin (15) and the bit tip portion are moved. The fitting with the annular recess is released, and the tip of the bit such as a driver bit is removed from the insertion hole (16) of the cylindrical connecting part (11). Connection release structure.   A washer-shaped pressing ring (14) is provided between the elastic member and the pin (15), and the urging force of the elastic member is uniformly spread over the entire pressing ring (14). The connecting / disconnecting structure to the electric rotary tool mounting bit according to claim 1.   The both ends of the pin (15) are bent to the axial center side at the outer peripheral surface of the cylindrical connecting portion (11), and bent portions (15f, 15f) are formed at both ends, thereby making the elastic member Alternatively, the contact portion between the pressing ring (14) and the pin (15) and the contact portion between the pressing portion (18) of the outer cylindrical body (12) and the pin (15) are made larger. A connection / disengagement structure to the electric rotary tool mounting bit according to 1 or 2.   A coil spring (13) is used as the elastic member, and the outer diameter of the stopper pin (15) is larger than the outer diameter of the wire forming the coil spring (13). The connection / disengagement structure to the electric rotating tool mounting bit according to any one of Items 1 to 3.

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