JPH0572372U - Electric screwdriver - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize an electric screwdriver that can attach screws even in a narrow space. [Structure] In an electric driver 1, a rotary shaft β ₁ orthogonal to a longitudinal connection α of the driver shaft body driving device 10 is provided on both left and right side surfaces of the other end side 10b of the driver shaft body driving device 10. And a socket portion (shaft body driving portion) 17 (17a, 17b) is provided. A driver shaft body 20 having a driver shaft 27 can be mounted in the socket portion 17, and a rotation axis β ₂ of the driver shaft body 20 is also orthogonal to the connection line α.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric screwdriver, and more particularly to a driver shaft mounting structure.

[0002]

[Prior Art]

 A screw mechanism is often used in the assembly structure of machinery, and among them, small screws are used everywhere including daily life peripheral devices. As a driver used as a tool to attach or remove the machine screws, it is common to have a driver shaft fixed to a grip part made of wood or resin so that it extends from the tip side of the grip part. Is. Here, in addition to the driver whose driver shaft is manually rotated through the grip, the driver may be an electric driver.

[0003]

[Problems to be solved by the device]

 However, in the conventional driver, the driver shaft is fixed so as to extend from the front end face side of the grip portion, so the total length of the driver is the length of the grip portion plus the length of the driver shaft. Because of the size, it is not possible to attach screws in a narrow space, which is a problem in terms of usability. That is, in the conventional screwdriver, it is necessary to engage the tip of the driver with the head of the screw with the driver standing upright in the screw mounting direction. The driver cannot be placed upright if the space on the screw line of the screw is narrow, such as when other members are fixed facing each other. Therefore, under such circumstances, it is necessary to remove the fixed member and leave the vicinity of the screw attachment position open, which is inconvenient and inefficient. Even if the driver can be erected upright in such a small space, the operator must put his hand in this gap to perform the work, and the driver cannot rotate smoothly. Work efficiency is low when installing.

In view of the above problems, an object of the present invention is to realize an electric screwdriver in which a screw can be easily attached and detached even in a narrow space.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, means taken in the present invention include a driver shaft body having a screw head insertion portion at the tip, a grip portion at one end side, and a driver shaft body at the other end side. In an electric driver having a rod-shaped driver shaft body drive device having a shaft body drive part, which can be mounted to prevent rotation of the base part and gives a rotational force to the driver shaft body, the rotary shaft of the shaft body drive part is That is, the electric driver is configured to be substantially orthogonal to the line connecting the driving unit and the gripping unit.

Here, the shaft body drive unit includes a first shaft body drive unit and a second shaft body drive unit that are provided on two surfaces of the driver shaft body drive device that face each other. It is preferable that all the second shaft drive units rotate in the same direction.

[0007] Furthermore, according to the type of screw to be attached and detached, the driver shaft side has a driver shaft fixing part where the driver shaft side is detachable so that the driver shaft can be replaced and used. , The driver shaft fixing part has a mounting hole into which the base end side of the driver shaft can be inserted and removed, and penetrates from the inner peripheral surface of this mounting hole to the outer peripheral surface of the driver shaft fixing part, and the driver shaft is inserted inside the mounting hole. It is preferable that a screw hole into which a screw for fixing the base end side thereof is to be screwed is formed.

[0008]

[Action]

 In the electric screwdriver according to the present invention having the above means, since the rotation shaft of the shaft drive unit is substantially perpendicular to the line connecting the shaft drive unit and the grip unit, When the driver shaft body is attached to the body drive portion, the rotation axis of the driver shaft body is in a state of being substantially orthogonal to the grip portion. Therefore, when the screw head is engaged with the tip of the driver shaft, it is the driver shaft (driver shaft body) that is upright on the screw attachment direction line, and the gripping portion, that is, the driver shaft. The body drive is in a direction substantially perpendicular to this driver axis. Therefore, in the electric driver, the size of the driver shaft in the rotation axis direction can be made small, and the usability is good even if the screw is installed in a narrow space.

Further, the shaft body drive section has a first shaft body drive section and a second shaft body drive section on two surfaces of the driver shaft body drive apparatus that face each other. When both the second shaft drive parts rotate in the same direction, by selecting the rotation direction of the driver shaft between the first and second shaft drive parts, the counterclockwise and clockwise rotations can be performed. Therefore, both screw installation and screw removal operations can be performed with a single electric drive, and there is no need to provide a complicated mechanism for switching the rotation direction.

[0010]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an electric driver 1 according to an embodiment of the present invention. In this figure, an electric screwdriver 1 is composed of a driver shaft body driving device 10 and a driver shaft body 20 which can be inserted into and removed from the driver shaft body driving device 10. Of these, the driver shaft body driving device 10 is It has a resin grip portion (grasping portion) 11 that is one end portion side 10a thereof, and a stainless steel backbone portion 15. The trunk portion 15 and the grip portion 11 can be attached and detached by rotating the other side in a predetermined direction with one side fixed. The grip portion 11 has a switch button 11a on the side surface on the side where it is attached to the backbone portion 15 and a battery storage hole 13 that is open inside the switch button 11a on the side where the backbone portion 15 is attached. The battery 12 is housed in the battery via a set holder (not shown). On the other hand, the backbone portion 15 has a drive portion 16 inside the attachment side of the grip portion 11 and a socket portion (shaft body drive portion) 17 on the other end portion side 10b. The drive unit 16 is composed of a motor, a gear mechanism, a belt and the like, and rotates the socket unit 17 using the battery 12 as a power source. Further, the socket portion 17 is provided such that its rotation axis β ₁ is substantially orthogonal to a line connecting the socket portion 17 and the grip portion 11, that is, a connection α in the longitudinal direction of the driver shaft body driving device 10. ing. Then, the socket portions 17 are formed on two surfaces (left and right side surfaces) facing each other at the other end portion side 10b of the driver shaft body driving device 10, respectively, and the right socket portion (opened on the right side surface A) ( The first socket driving part 17a and the left socket part (second shaft driving part) 17b opening on the left side surface B 1 are formed, and the right socket part 17a and the left socket part 17b are integrally formed. It is designed to rotate in the same direction. That is, both the right socket portion 17a and the left socket portion 17b are connected to the drive portion 16 so as to rotate rightward with respect to the right side surface A. Therefore, the right socket portion 17a and the left socket portion 17b rotate counterclockwise with respect to the left side surface B. Here, both the right socket portion 17a and the left socket portion 17b are engaged with each other with the base portion of the driver shaft body 20 having a hexagonal outer peripheral surface shape described later inserted therein. It has 12 pairs of irregularities formed at equal intervals. Therefore, even if the base portion of the driver shaft body 20 is inserted into either the right socket portion 17a or the left socket portion 17b, the outer peripheral surface of the base portion of the driver shaft body 20 and the inside of the right socket portion 17a and the left socket portion 17b are The peripheral surfaces are engaged with each other, and the driver shaft body 20 is prevented from rotating by the right socket portion 17a and the left socket portion 17b. Further, a ball plunger (not shown) is provided inside the right socket portion 17a and the left socket portion 17b. Here, the external dimensions of the driver shaft driving device 10 are about 320 mm in length, about 70 mm in width, and about 35 mm in height (thickness). The weight of the driver shaft drive device 10 alone is about 0.85 kg. Further, when the driver shaft body 20 is set, the electric driver 1 has a height (thickness) of about 60 mm and a weight of about 1.0 kg.

On the other hand, the driver shaft body 20 is composed of a socket adapter (driver shaft fixing portion) 21 which is a base portion thereof and a driver shaft 27 which is detachably attached to the socket adapter 21, and the driver shaft 27 is interposed by the socket adapter 21. The right socket 17a or the left socket 17b. The socket adapter 21 has its both end surfaces formed as flat surfaces, and between these two end surfaces, a disk-shaped flange 25, in order from one end surface 21a to the other end surface 21b. It has a hexagonal cylinder-shaped body portion 21c, a circumferential groove-shaped fitting groove 24, and an insertion guide surface 26 which is a conical surface. Further, the socket adapter 21 is formed with a through hole (mounting hole) 23 penetrating from the central portion of the one end surface 21a to the central portion of the other end surface 21b, the inner diameter of which is smaller than the outer diameter of the driver shaft 27. And is getting bigger. Inside the through hole 23, a screw hole 22 formed from the outer peripheral surface of the body portion 21c penetrates. Further, the driver shaft 27 has a hexagonal columnar outer peripheral shape on the base end side 28 thereof, and the screw insertion portion 27a on the tip end side thereof is a plus driver. Here, with the base end side 28 of the driver shaft 27 inserted into the through hole 23 of the socket adapter 21, the fixing screw 29 (headless screw) is inserted into the screw hole 22 from the outer peripheral surface of the body portion 21c. As it is screwed in, the tip of the fixing screw 29 comes into contact with the side surface of the driver shaft 27 on the base end side 28, and the driver shaft 27 is fixed to the socket adapter 21.

In the electric screwdriver 1 having such a configuration, first, the driver shaft 27 is fixed to the socket adapter 21, and then the socket adapter 21 is inserted into the inner portion of the socket portion 17. The end surface of the socket contacts the end surface of the right socket portion 17a (left socket portion 17b) to define the insertion position, and the outer peripheral surface of the body portion 21c of the socket adapter 21 is the inner peripheral surface of the right socket portion 17a (left socket portion 17b). And the driver shaft 27 is fixed to the right socket portion 17a (left socket portion 17b) via the socket adapter 21. In this state, the rotation axis β ₂ of the driver shaft body 20 is equal to the rotation axis β ₁ of the socket portion 17, and thus is substantially orthogonal to the longitudinal connection α of the driver shaft body drive device 10. .. A ball plunger provided inside the right socket portion 17a (left socket portion 17b) engages with the fitting groove 24 of the socket adapter 21, so that the driver shaft body 20 moves to the right socket portion 17a ( It has a structure that does not fall off from the left socket 17b).

Next, a usage mode of the electric driver 1 will be described with reference to FIG. In this example, the machine screw is a right-hand screw with a cross hole.

In this figure, the case where the cover 31 is attached to the device body 32 using the machine screw 30 is shown as an example, and the screw of the machine screw 30 which is to be screwed into the device body 32 through the cover 31 is shown. Since the obstacle 40 faces the wearing portion through a narrow space, the conventional screwdriver cannot be used for screwing work.

In such a situation, when the small screw 30 is screwed by using the electric screwdriver 1 of this example, the driver shaft body 20 is in a state of being attached to the right socket portion 17a. In this state, first, the screw insertion portion 27a of the driver shaft 27 of the electric screwdriver 1 is engaged with the cross groove of the head of the machine screw 30. In this state, the driver shaft 27 is in an upright state between the device body 32 and the obstacle 40 on the line in which the machine screw 30 is screwed in. And is located in the vertical direction, and is located between the device body 32 and the obstacle 40. Next, when the switch button 11a of the driver shaft body drive unit 10 is pushed, the drive unit 16 incorporated in the driver shaft body drive unit 10 causes the right socket portion 17a to move about 400 r. p. m. As a result of the high speed rotation of the right socket portion 17a and the high speed rotation of the driver shaft body 20 at the same time, the small screw 30 is screwed in and the cover 31 is attached to the device body 32. The drive unit 16 of the electric driver 1 is provided with a torque limiter mechanism, and the machine screw 30 is tightened with a predetermined torque.

On the other hand, when loosening the small screw 30, the electric screwdriver 1 is used with the driver shaft body 20 inserted in the left socket portion 17b. Here, when the machine screw 30 is a left-hand thread, the driver shaft 20 is fixed to the socket portion 17 (right socket 17a, left socket portion 17b) in a state opposite to the above-described usage mode.

As described above, the electric screwdriver 1 according to the present embodiment has a dimension from the driver shaft body driving device 10 to the tip of the driver shaft 27 when the driver shaft body 20 is attached to the driver shaft body driving device 10. Since the (thickness) is about 60 mm, if there is a space of 60 mm or more between the threaded portion of the small screw 30 and the obstacle 40, the machine screw 30 can be screwed without removing the obstacle 40. Moreover, since the electric screwdriver 1 is electric, the operator can operate the switch button 11a while holding the screw insertion portion 27a and the groove of the screw head of the machine screw 30 in the engaged state. , Easy to use. The rotation direction of the driver shaft 27 can be switched depending on whether the driver shaft body 20 is fixed to the socket part 17 (17a, 17b) of the driver shaft body drive device 10 on the right or left side. There is no need to provide a complicated rotation direction switching mechanism. Further, since the driver shaft body 20 is composed of the socket adapter 21 and the driver shaft 27, various driver shafts can be attached depending on the type of screw, which is convenient. Therefore, in designing various devices, there are less restrictions on screwing positions and the like, which also has the effect of increasing the degree of freedom in design.

In this example, the usage mode in a narrow space is described, but the present invention is not limited to this, and the electric driver according to this example can be used even in a situation where a sufficient space is secured. Of course. In addition, it is possible to use a slotted screwdriver shaft to handle small machine screws, and it is also possible to use one in which the tip of the screwdriver shaft is in the shape of a drill or a drill.

[0020]

[Effect of the device]

 As described above, the electric screwdriver according to the present invention is characterized in that the rotation shaft of the shaft drive unit (socket unit) is substantially orthogonal to the longitudinal connection of the driver shaft drive unit. is doing. Therefore, even in the driver shaft body mounted on the shaft body drive portion, the rotation axis thereof is substantially orthogonal to the longitudinal connection of the driver shaft body drive device, so that the driver shaft of the electric driver is The size of the can be reduced in the direction of the rotation axis, and the screws can be easily installed even in a narrow space.

In addition, in the case where the shaft body drive portion (socket portion) is formed as the first and second shaft body drive portions on the two surfaces of the driver shaft body drive device that face each other, any of Since the rotation direction of the driver shaft can be changed depending on whether the driver shaft body is attached to the shaft body drive unit, a complicated rotation direction switching mechanism is unnecessary.

Further, when the driver shaft body is composed of the driver shaft fixing portion (socket adapter) and the driver shaft, the type of screw can be dealt with by replacing only the driver shaft. It is convenient.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric screwdriver according to an embodiment of the present invention.

FIG. 2 is a side view showing how the electric driver is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric driver 10 ... Driver shaft drive device 11 ... Grip part (grasping part) 12 ... Battery 15 ... Core part 16 ... Drive part 17 ... Socket part ( Shaft body driving part) 20 ... Driver shaft body 21 ... Socket adapter (driver shaft fixing part) 27 ... Driver shaft 29 ... Fixing screw α ... Connection β ₁ ... Rotating shaft (shaft) body drive unit) beta ₂ · · · rotary shaft (driver shaft member)

Claims (3)

[Scope of utility model registration request] 1. A driver shaft body having a screw head insertion portion at its tip, a grip portion at one end side, and a base portion of the driver shaft body at the other end side which can be attached to the driver shaft body while being prevented from rotating. A rod-shaped driver shaft body driving device having a shaft body driving portion for imparting a rotational force, wherein the rotation shaft of the shaft body driving portion includes the shaft body driving portion and the grip portion. An electric driver characterized by being substantially orthogonal to the connecting line. 2. The shaft driving unit according to claim 1,
The driver shaft body drive device includes a first shaft body drive portion and a second shaft body drive portion provided on two surfaces facing each other, and the first and second shaft body drive portions are the same. Electric screwdriver that rotates in any direction. 3. The driver shaft fixing portion according to claim 1 or 2, wherein a driver shaft having a screw head insertion portion is formed on the base side of the driver shaft body as a detachable driver shaft fixing portion. Is a mounting hole into which the base end side of the driver shaft can be inserted / removed, and penetrates from the inner peripheral surface of the mounting hole to the outer peripheral surface of the driver shaft fixing portion, and the base end side of the driver shaft is inside the mounting hole. An electric screwdriver, wherein a screw hole into which a screw for fixing is screwed is formed.