JP2008055546A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool excellent in carrying and handling. <P>SOLUTION: This power tool 10 is provided with a tool body 11 having a body part 20 with a power motor 21 stored in it and a gripping part 30 extended downward from the body part 20 and a battery 12 mounted to the tool body 11. The power tool 10 is constituted so that one end of a supporting belt 41 supporting the power tool 10 is mounted at a position A toward the front surface of the tool body 11 and the other end of the supporting belt 41 is mounted at a position B toward the back surface of the tool body 11 with a center-of-gravity position G in the state of an output shaft 21a of the power motor 21 directed to a front surface direction in the state of the gripping part 30 positioned below the body part 20 as a standard position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric tool including a tool body having a body part in which an electric motor is accommodated and a grip part extending downward from the body part, and a battery part attached to the tool body.

  Building work using a power tool such as a hammer drill or an impact wrench is usually performed at a high place where a scaffold or the like is provided. For this reason, as shown to Fig.9 (a), the strap 2 is attached to the general electric tool 1 at the tool lower end part. Usually, in order to prevent the electric tool from dropping, the operator holds the electric tool 1 while the strap 2 is passed through the wrist.

  However, when climbing up and down ladders, scaffolds, etc., it is necessary to work with the strap 2 on the wrist, and also when working in unstable places such as high places. There is a problem that work efficiency is not always preferable because work needs to be performed.

  For this reason, a method of using the electric tool 1 so that the length of the strap 2 is lengthened and hung from the shoulder is also conceivable. However, as shown in FIG. Since it is attached to the lower end, when the work is performed with the strap 2 extended and hung from the shoulder, the electric tool 1 is swung in a pendulum shape as shown in FIG. There was a possibility that the tip of the tool 1 would contact the operator.

  If the strap 2 is too long, the strap 2 may be caught by building materials or installation members when carrying the main body of the power tool 1, and the strap 2 may be caught during work using the power tool 1. There was a risk that the work efficiency would be reduced due to the obstruction of the work.

For this reason, for example, there has been proposed a power tool that includes a strap winding mechanism inside the tool body and can change the length of the strap as necessary (see, for example, Patent Document 1). An electric tool that is detachable from a main body has been proposed (see, for example, Patent Document 2).
JP-A-2005-199396 (page 8-10, FIG. 1, FIG. 2, FIG. 9, FIG. 10) JP 2003-245877 (Page 2-3, FIGS. 1 and 2)

  However, in a power tool provided with a strap winding mechanism inside the tool body, the winding mechanism is provided inside the power tool, so that the size of the tool body becomes unnecessarily large and the weight of the tool increases. Therefore, there is a problem that workability is inferior.

  On the other hand, in the power tool with the strap detachable from the main body, the strap is supported by the hook holding shaft part. There was a problem that it was not easy to attach and detach.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the electric tool excellent in conveyance and handling.

  In order to solve the above-described problems, an electric tool according to the present invention is provided with a tool body having a body part in which an electric motor is accommodated and a grip part extending downward from the body part, and attached to the tool body. In the state where the gripping part is located below the body part, the tool has a center of gravity position of the electric tool in which the output shaft of the electric motor is directed in the front direction as a reference position. One end of a support band for supporting the electric tool is attached to a position near the front of the main body, and the other end of the support band is attached to a position near the back of the tool main body.

  Further, with respect to the electric tool in which the output shaft of the electric motor is directed in the front direction in a state where the grip portion is positioned below the body portion, both end portions of the support band are formed on the outer surface of the housing of the tool body. The output shaft may be mounted on a dividing plane that can divide the output shaft in the vertical direction.

  Furthermore, the end of the support band may be detachably attached to the tool body.

  The support band may have an adjustment mechanism for adjusting the length of the band.

  Further, the adjustment mechanism portion has a locking projection that is locked to a locked portion provided in the tool body, and the locking projection can be hooked on an operator's waist belt. Also good.

  The support band may be a rope provided in a safety band.

  In this case, at least two attachment members are provided on the rope, one attachment member is attached to the tool body at a position near the front of the electric tool, and the other attachment member is a rear surface of the electric tool. It may be attached to the tool body at a position close to it.

  In the electric tool according to the present invention, the position of the center of gravity of the electric tool with the output shaft of the electric motor directed in the front direction in the state where the gripping part is located below the body part is set to a position closer to the front of the tool body. One end of the support band that supports the electric tool is attached, and the other end of the support band is attached to the position near the back of the tool body, so that the operator can easily carry it by hanging the support band on the shoulder etc. It becomes.

  In particular, since the position of the center of gravity is located between the attachment positions of the support bands, it is possible to prevent the electric tool from being swung in a pendulum shape at the end of the strap as in the prior art. It can prevent that the front-end | tip part contacts an operator etc.

  In addition, since the center of gravity position is located between the attachment positions at both ends of the support band, the power tool is in a stable state during the transportation operation, and it is possible to reduce the transportation burden and realize a smooth transportation process. It becomes possible.

  Furthermore, in the electric tool according to the present invention, both ends of the support band are provided in the housing of the tool main body with respect to the electric tool in which the output shaft of the electric motor is directed in the front direction in a state where the grip portion is located below the body portion. It is mounted on a division plane that is an external surface and can divide the output shaft in the vertical direction.

  A general electric tool is designed so that the right and left weight balance around the output shaft (rotating shaft) of the electric motor is equal in consideration of stability during tool holding or tool use. . For this reason, even when a heavy power tool is supported by using the support band by attaching both ends of the support band to the outer surface of the casing on the dividing plane that can divide the output shaft in the vertical direction, The tool can be transported in a stable state without tilting left and right.

  Furthermore, when the end of the support band is detachably attached to the tool body, when the support band is not required, the power band can be used by removing the support band from the tool body. It is possible to prevent the support band from being caught by building materials or installation members, or the support band from interfering with the work.

  In particular, when the support band is provided with an adjustment mechanism for adjusting the length of the band, the length of the support band can be freely changed by the winding mechanism, so that the operator can The carrying work can be performed by adjusting the support band to an optimum length according to the height and the like. In addition, by shortening the belt length, it is possible to prevent the support belt from being caught by building materials or installation members, etc., and the support belt can interfere with the work during the work using the power tool. Thus, it is possible to prevent the work efficiency from being lowered.

  Further, when the adjustment mechanism portion is provided with a locking projection that is locked to the locked portion provided in the tool body, the locking projection is locked to the locked portion of the tool body. The adjustment mechanism can be attached to the tool body. Furthermore, the adjustment mechanism can be easily detached from the tool body by removing the locking projection from the locked part. Therefore, when the support band is not used, the adjustment mechanism can be removed and the size and weight of the power tool can be removed. The height can be reduced, and the handling during work can be further improved.

  Also, by adjusting the length of the support band with the removed adjustment mechanism part and winding it around the operator's waist, the support band can be fixed to the operator's waist like a belt, and the adjustment mechanism part, etc. Can be prevented from easily falling off the waist.

  Further, when the locking protrusion can be hooked on the operator's waist belt, it is possible to prevent the support band and the adjustment mechanism portion from being lost, and the adjustment mechanism portion and the like can be You can keep out of the way.

  In addition, when the support band is a rope provided in the safety band, when the rope is not attached to the power tool, the rope is used as the support band by using the rope according to the normal method of using the safety band. There is no need to consider the storage location.

  In particular, at least two attachment members are provided on the rope, one attachment member is attached to the tool body at a position near the front of the electric tool, and the other attachment member is attached to the tool body at a position near the back of the electric tool. When attached, even when a safety belt rope is used as the support belt, the power tool can be supported by the two-point support, so that the power tool can be transported in a stable state.

  Hereinafter, the case where a hammer drill is used as an electric tool according to the present invention will be described.

  FIG. 1 is a side view showing a schematic configuration of a hammer drill. The hammer drill 10 has a tool body 11 and a battery part 12.

  The tool body 11 part of the hammer drill 10 has a body part 20 in which a motor or the like is accommodated, and a grip part 30 extending downward from the rear part.

  The body portion 20 accommodates a motor (electric motor) 21, a rotation transmission portion 22 that transmits the rotational force of the motor 21, and a striking mechanism portion 23 that converts the rotational force of the motor 21 into a striking force. Further, the grip portion 30 is provided with an operation switch 31, and a winding mechanism portion (adjustment mechanism portion) 40 described later can be detachably attached.

  The battery unit 12 has a role of supplying stable electric power to the motor 21 and is detachably attached to the tool body 11 so as to be positioned closer to the front (front) of the grip 30. ing.

  The rotation transmission unit 22 includes a mechanism for rotating the tip tool 24 attached to the tip portion of the tool body 11.

  Specifically, an intermediate shaft 22c is rotatably connected via a pinion 22a and a first gear 22b press-fitted into a rotation shaft (output shaft) 21a of the motor 21, and the rotation of the intermediate shaft 22c is The tip tool 24 is rotated by being transmitted to the tip tool 24 through the second pinion 22d and the cylinder 22e.

  On the other hand, the striking mechanism unit 23 includes a mechanism for converting the rotational force of the motor 21 into the reciprocating motion of the piston 23 a and transmitting the striking force of the piston 23 a to the tip tool 24.

  Specifically, a clutch 23b that is spline-fitted to the intermediate shaft 22c and is movable in the axial direction, and a reciprocating bearing 23c that is rotatably engaged on the intermediate shaft 22c are urged by a clutch spring 23d. It is structured to mesh. When the rotating shaft 21a of the motor 21 starts to rotate, this rotational force is converted into the reciprocating motion of the piston 23a by the action of the clutch 23b and the reciprocating bearing 23c, and the air chamber 23e that is compressed and fluctuated in accordance with this reciprocating motion. The striking force is transmitted to the tip tool 24 via the air spring.

  The gripping portion is provided with an operation switch 31 for switching ON / OFF of the motor 21. When the operator turns the operation switch 31 ON / OFF, the driving of the motor 21 is started / stopped.

  The tool body 11 has a housing formed of a resin casing member 35. The casing member 35 is constituted by a pair of halved casings having a symmetrical shape, and the motor 21, the rotation transmission unit 22, the striking mechanism unit 23, the base of the operation switch 31, and the like are sandwiched between the halved casings. Thus, the casing member 35 is fixedly housed.

  A fixing hole 25 for fixing the end portion of the belt portion (support band) 41 drawn out from the winding mechanism portion 40 is provided on the upper surface of the case portion near the tip tool 24 of the body portion 20. The detailed installation position of the fixing hole 25 will be described later.

  FIG. 2A is a perspective view showing the grip portion 30 of the electric tool 1 and a winding mechanism portion 40 that is detachably provided on the grip portion 30.

  The winding mechanism section 40 has a substantially rectangular parallelepiped shape with one side formed in a rectangular shape so as to correspond to the rectangular recess 36 provided at the lower end of the gripping section 30, and is formed at the lower rear end of the winding mechanism section 40. An entrance / exit hole 42 through which the belt portion 41 is stored and pulled out is formed.

  As shown in FIG. 2B, the winding mechanism 40 is provided with a rotating shaft 43 that is urged to rotate in one rotation direction by a general urging means, and one end of the belt 41 is The rotary shaft 43 is fixed. When the rotating shaft 43 is rotated by the urging force of the urging means, the belt portion 41 is wound with the rotation of the rotating shaft 43 and is stored in the storage space 44 formed inside the winding mechanism portion 40. It has become.

  Further, in the vicinity of the entrance / exit hole 42 in the take-up mechanism 40, clamping means is provided for preventing the drawn-out belt portion 41 from being stored in the storage space 44 due to the urging force of the rotating shaft 43. Yes. The clamping means is configured by general fixing brackets 45a and 45b that fix the belt portion 41 by sandwiching it from above and below.

  For example, a lever member 45c is provided on the side surface of the winding mechanism 40, and the like so that the interval between the opposing fixing brackets 45a and 45b can be expanded and contracted, and the interval between the fixing brackets 45a and 45b is reduced by the lever member 45c. The movement of the belt 41 is restricted by clamping the portion 41 and fixing the length of the belt 41 in the winding mechanism 40.

  A fixing hook 41 a that can be attached to and detached from the fixing hole 25 provided in the body portion 20 is provided at the end of the belt portion 41.

  Locking hooks (locking protrusions) 46 that are L-shaped in a side view as shown in FIGS. 2A and 2B are provided on the front side surface of the winding mechanism 40. Further, a locking hook guide hole (locked portion) 33 for locking (storing) the locking hook 46 is formed in the rectangular recess 36 in the grip portion 30.

  The locking hook 46 is made of a synthetic resin or the like having high strength and a certain degree of elasticity. As shown in FIG. 3A to FIG. 3C, locking claws 46 a and 46 b projecting to the side are provided at both upper ends of the locking hook 46. In the upper part, cut portions 46c and 46d for bending the locking claws 46a and 46b toward the center are formed.

  The locking hook guide hole 33 is a cylindrical hole whose bottom surface is opened, and the locking hook 46 is opened to the bottom in a state where the locking claws 46a and 46b of the locking hook 46 are bent inward. The locking hook 46 can be accommodated by being introduced through the opened opening 33a (see FIGS. 3A and 3B). Further, in order to prevent the locking hook 46 from falling out of the locking hook guide hole 33 when the locking hook 46 is sufficiently stored in the side portion of the locking hook guide hole 33, Locking holes 33b and 33c that are locked to the claws 46a and 46b are provided. For this reason, when the locking hook 46 is fully stored in the locking hook guide hole 33, the locking claws 46a and 46b of the locking hook 46 are locked to the edges of the locking holes 33b and 33c. As a result, the locking hook 46 is fixed in the locking hook guide hole 33.

  On the other hand, when the locking hook 46 is removed from the locking hook guide hole 33, the locking hook 46 is moved downward with the locking claws 46a and 46b of the locking hook 46 bent toward the center. By sliding, the locking claws 46a and 46b can be accommodated in the locking hook guide hole 33 as shown in FIG. 3C to FIG. Can be removed from the locking hook guide hole 33.

  FIG. 4 shows the hammer drill 10 in which the tip tool 24 positioned on the tip side of the rotating shaft (output shaft) 21a of the motor 21 is directed in the front direction in a state where the grip portion 30 is located below the body portion 20. The belt unit 41 is pulled out to the extent that the belt unit 41 can be hung on the shoulder in a state in which the winding mechanism unit 40 is attached to the grip unit 30, and the fixed hook 41 a of the belt unit 41 is pulled out to the fixing hole of the body unit 20. 25 shows a state fixed to 25.

  The electric tool generally includes heavy components such as the motor 21 and the battery unit 12, and the gravity center position G tends to be closer to the front side (front side) than the grip unit 30. It is not easy to use and carry the electric tool by holding only the holding part 30.

  For this reason, as shown in FIG. 4, the center of gravity position G of the electric power tool 10 in a state where the tip tool 24 is directed in the front direction is used as a reference, and the rear side of the center of gravity position G, that is, the rear side of the gripping portion 30 is located. One end of the belt portion 41 is attached so that the base end of the belt portion 41 is located at the position B, and further closer to the front side than the center of gravity position G, that is, to the housing upper surface position A of the body portion 20 near the tip tool 24, By attaching the other end portion of the belt portion 41 using the fixing hole 25 and the fixing hook 41a, the operator can easily carry the electric tool 10 by placing the belt portion 41 on a shoulder or the like.

  In particular, since the center of gravity G is located between the attachment positions A and B of the belt portion 41, it is possible to prevent the electric tool from being swung in a pendulum shape at the end of the strap as in the past. It is possible to prevent the tip tool 24 from coming into contact with an operator or the like. Moreover, since the center of gravity position G is located between the attachment positions A and B of the belt portion 41, the power tool is in a stable state during the transportation operation, thereby reducing the transportation burden and realizing a smooth transportation process. It becomes possible to plan.

  Furthermore, since the length of the belt part 41 can be freely changed by the winding mechanism part 40, the belt part 41 can be adjusted to an optimum length according to the height of the worker and the carrying work can be performed. it can. In addition, by shortening the belt length, the belt portion 41 can be prevented from being caught by building materials or installation members, and the belt portion 41 can be operated during the work using the electric power tool 10. It is possible to prevent the work efficiency from being lowered due to the trouble.

  Furthermore, a general electric tool is designed so that the right and left weight balance around the rotating shaft 21a of the motor 21 is equal in consideration of stability during tool holding or tool use. For this reason, the fixing hole 25 to which one end of the belt part 41 is attached and the base part of the belt part 41 in the winding mechanism part 40 are arranged on the outer surface of the casing on the dividing plane where the rotating shaft 21a can be divided in the vertical direction. Thus, even when a heavy power tool such as the hammer drill 10 is supported using the belt portion 41, the power tool can be transported in a stable state without tilting left and right.

  Further, by pushing the locking claws 46a and 46b from the side to remove the take-up mechanism 40 from the gripping part 30, and by removing the fixing hook 41a of the belt part 41 from the fixing hole 25, the belt part 41 can be easily removed. Since it can remove from the hammer drill 10, when the belt part 41 is not required, the belt part 41 can be removed and the electric tool 10 can be utilized. For this reason, it can prevent that the belt part 41 gets caught in a building construction material, an installation member, etc., or the belt part 41 obstructs work.

  Furthermore, since the winding mechanism 40 can be easily removed from the tool body 11 with the removal of the belt 41, the size and weight of the electric tool 10 are reduced when the belt 41 is not used. This makes it possible to further improve handling during work.

  Further, since the latching hook 46 of the removed winding mechanism 40 has an L-shape when viewed from the side, for example, as shown in FIG. The belt 50 can be hooked so as to be hooked, so that the winding mechanism 40 in which the belt 41 is wound and stored can be prevented from being lost, and the winding mechanism 40 can be prevented from getting in the way during operation. it can.

  Further, as shown in FIG. 5 (b), the belt portion 41 is operated like a waist belt 50 by providing a fixing hole portion 47 for locking the fixing hook 41 a at the end of the winding mechanism portion 40. It is possible to wind the belt around the person's waist and fix the fixing hook 41a of the belt portion 41 to the fixing hole portion 47 and attach it to the waist. By winding the belt portion 41 around the waist in this manner, the winding mechanism portion 40 can be held without hooking the locking hook 46 on the waist belt 50. Further, even when the hook 46 is hooked on the waist belt 50, it is possible to prevent the winding mechanism portion 40 from easily falling off by winding the belt portion 41 around the waist. It becomes.

  The winding mechanism unit 40 is configured such that one end of the belt unit 41 is fixed to the rotating shaft 43 of the winding mechanism unit 40, and the belt unit 41 provided with the fixing hook 41a is housed / drawn into the winding mechanism unit 40. However, it is not necessarily limited to such a configuration. For example, as illustrated in FIG. 7A, the winding mechanism unit 40 may be provided at an intermediate position of the belt unit 41. In that case, another fixing hole 25a is provided at the end of the grip portion 30, and at the same time, a fixing hook 41b that can be attached to the fixing hole 25a is provided at the end of the belt portion 41. Can be easily removed, and the length of the belt portion 41 can be easily adjusted according to the height of the operator.

  Further, when the fixing hooks 41a and 41b are provided at both ends of the belt portion 41, as shown in FIG. 6A, even when the hooking mechanism portion 40 is not provided with the locking hook 46. After the belt portion 41 is wound around the waist, the belt portion 41 can be fixed to the waist by locking the ends of the belt portion 41 with the fixing hooks 41a and 41b.

  As shown in FIG. 6B, the belt portion 41 is provided with a plurality of holes 52 that are equally spaced at one end of the belt portion 41 and a locking pin 53 that is locked to the hole at the other end. It is structured to be fixed to the waist like a normal belt, or as shown in FIG. 6C, a buckle portion 54 used for a general belt is provided in place of the locking pin 53 and fixed to the waist. It may be the structure which does.

  Further, in the present embodiment, the winding mechanism 40 is detachably fixed to the grip portion 30 by the locking hook 46, and the winding mechanism 40 is hooked to the waist belt 50 by the locking hook 46. However, a belt attachment part for attaching the take-up mechanism 40 to the waist belt 50 may be provided on the take-up mechanism 40 separately from the locking hook 46. By separately providing the belt mounting parts as described above, the mounting parts having a structure that can be attached to and detached from the waist belt more easily than the locking hooks 46 and are not easily detached can be used as the locking hook guides. The hole 33 can be provided without considering the locking structure and the like.

  The power tool according to the present invention has been described in detail using the hammer drill 10 as an example, but the power tool according to the present invention is not limited to the above-described embodiment. It will be apparent to those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, one end of the belt portion 41 is attached to the fixing hole 25 provided on the upper surface of the body portion 20 near the tip tool 24, and the base portion (the other end) of the belt portion 41 is the grip portion 30. Although it was set as the structure fixed to a rear-end lower part position (winding mechanism part 40), the attachment position of the both ends of the belt part with respect to an electric tool is not limited to this position.

  As described above, in the state where the grip portion 30 is positioned below the body portion 20, the center of gravity position G of the electric tool with the tip tool 24 (motor output shaft) of the motor 21 directed in the front direction is used as a reference position. If one end of the belt part (support band) 41 is attached to a position near the front of the tool body 11 and the other end of the belt part (support band) 41 is attached to a position near the back of the tool body 11, the present invention. It is possible to achieve the effect of the electric tool according to the above. Therefore, as shown in FIG. 7B, one end of the belt portion 41 is attached to the housing upper surface position A near the tip tool 24 of the body portion 20, and the other end is close to the motor 21 (close to the rear portion) of the body portion 20. It may be attached to the housing upper surface position B. Even when the belt portion 41 is attached in this way, the center of gravity position G of the electric tool is located between the attachment positions A and B at both ends of the belt portion 41, so that the electric tool is balanced with the belt portion 41. It becomes possible to hold.

  Moreover, as shown to Fig.8 (a), it is also possible to utilize the rope 57 of the safety belt 56 as the belt part 41 demonstrated in the present Example. FIG. 8B shows a general safety belt 56, and a rope 57 of the safety belt 56 is provided with two fixing hooks (attachment members) 58 a and 58 b. The fixed hooks 58a and 58b can move (adjust) the fixed positions of the fixed hooks 58a and 58b as indicated by arrows in FIG. 8B. Note that the number of the fixing hooks is not limited to two, and one or three or more fixing hooks may be provided.

  After adjusting the interval between the fixing hooks 58a, 58b according to the height of the operator, one fixing hook 58a is attached to the fixing hole 25 provided on the upper surface of the body portion 20 near the tip tool 24, and the other fixing hook By attaching 58b to the fixing hole 25a provided at the end of the gripping part 30, two points of the power tool such as the hammer drill 10 are supported by the rope 57 of the safety belt 56 as shown in FIG. Is possible. Thus, even when the rope 57 of the safety belt 56 is used as the belt portion 41, the rope 57 can be hung on the shoulder or the like so that the power tool can be supported by two-point support. It can be transported. Further, when the rope 57 is not attached to the electric tool, the rope 57 is used according to the normal method of using the safety belt 56, so that it is not necessary to consider the storage location of the rope 57 used as the belt portion 41.

  Moreover, in this embodiment, although demonstrated using the hammer drill 10 as an example as an electric tool, the electric tool which concerns on this invention is not limited to the hammer drill 10, An impact wrench, a vibration drill, a reinforcing bar An electric tool such as a binding machine may be used, and a pneumatic tool such as a pneumatic nailing machine or a pneumatic impact driver may be used. The effects shown in the present invention can be achieved by using the same configuration as the present invention for tools that are heavy and are not easy to carry and handle with one hand, such as these tools. Become.

  Further, in the present embodiment, the belt portion is used as an example of the support band, and the power tool is supported by the belt-shaped band. However, the support band is not limited to the belt-shaped band, and the strap The belt width may be narrow, or the belt width may be wider than that of a belt or the like. Further, the thickness of the support band is not particularly limited. Whatever the thickness and width of the support band, the power tool can be sufficiently supported by the support band, and the load on the operator can be reduced. The effects of the invention can be achieved.

It is side sectional drawing of the hammer drill which concerns on embodiment. It is the figure which showed the winding mechanism part which concerns on embodiment, (a) is the perspective view which showed a mode that it comprised so that attachment or detachment to a holding part was possible, (b) is a side cross section which shows a winding mechanism part FIG. It is the figure which showed the latching hook of the winding mechanism part which concerns on embodiment, (a) shows the state before inserting a latching hook in a latching hook guide hole, (b) is a latching hook engaging. The state in the middle of being inserted in the stop hook guide hole is shown, and (c) shows the state in which the lock hook is sufficiently pushed into the lock hook guide hole. In the power tool according to the embodiment, the base end of the belt portion is positioned at a position closer to the back side than the center of gravity position G with respect to the center of gravity position G of the power tool in a state where the tip tool is directed in the front direction. 4 is a side view showing a state in which one end of the belt portion is attached and the other end portion of the belt portion is attached to the upper surface of the body portion closer to the front side than the center of gravity position G. FIG. The winding mechanism part which concerns on embodiment is shown in the state attached to the operator's waist, (a) shows the state which latched the hook on the waist belt, (b) worked the belt part It shows the state of being wound around the person's waist and fixed. It is the figure which illustrated the shape of the both ends of the belt part concerning an embodiment, (a) shows the structure which locks a pair of fixed hooks, and (b) makes a lock pin insert into a hole, and locks it. The structure is shown, (c) has shown the structure fixed using a buckle part. It is the side view which showed the example which attached the belt part to the electric tool so that the gravity center position G of an electric tool may be located between the attachment positions A and B of the both ends of the belt part which concerns on embodiment. (A) has shown the electric tool which used the rope of the safety belt | belt as a belt part, (b) is the figure which showed the safety belt | loop with which the hook was provided in the rope. (A) has shown the conventional electric tool with which the strap was attached to the lower end part, (b) It has shown a mode that the strap lengthened enough to be hung on a shoulder etc. is swung in a pendulum shape.

Explanation of symbols

1 ... (conventional) electric tool 2 ... strap 10 ... hammer drill (electric tool)
DESCRIPTION OF SYMBOLS 11 ... Tool main body 12 ... Battery part 20 ... Body part 21 ... Motor (electric motor)
21a ... (motor) rotating shaft (output shaft)
22 ... rotation transmission part 22a ... pinion 22b ... first gear 22c ... intermediate shaft 22d ... second pinion 22e ... cylinder 23 ... striking mechanism part 23a ... piston 23b ... clutch 23c ... reciprocating bearing 23d ... clutch spring 23e ... air chamber 24 ... tip tool 25, 25a ... fixed hole 30 ... gripping part 31 ... operation switch 33 ... locking hook guide hole (locked part)
33a ... Opening portions 33b and 33c (of the locking hook guide hole) Locking hole 35 (of the locking hook guide hole) ... Casing member 36 ... Rectangular recess 40 (of the gripping part) ... Winding mechanism (adjustment mechanism) Part)
41 ... belt part (support belt)
41a, 41b ... fixed hook 42 ... entrance / exit hole 43 (for winding mechanism) rotating shaft 44 (for winding mechanism) storage space 45a, 45b (for winding mechanism) ... (for winding mechanism) Fixing bracket 45c ... Lever member 46 (of winding mechanism) ... Locking hook (locking protrusion) of (winding mechanism)
46a, 46b ... locking claws 46c, 46d (of locking hooks) ... notches 47 (of locking hooks) ... fixing hole 50 (of winding mechanism) ... waist belt 52 ... (provided at belt end) Hole 53 ... locking pin 54 (provided at the end of the belt part) ... buckle part 56 (provided at the end of the belt part) ... safety belt 57 ... (safety belt) ropes 58a, 58b (safety belt rope) Fixed hook) (mounting member)
A, B ... Installation position G (of the locking belt) G Center of gravity (of the power tool)

Claims (7)

In a power tool comprising a tool body having a body part in which an electric motor is stored and a grip part extending downward from the body part, and a battery part attached to the tool body,
In the state where the gripping part is located below the body part, the electric power tool is located at a position closer to the front of the tool body with the center of gravity of the electric tool with the output shaft of the electric motor directed in the front direction as a reference position. One end of a support band that supports the power tool is attached, and the other end of the support band is attached to a position closer to the back surface of the tool body.   In contrast to the electric tool in which the output shaft of the electric motor is directed in the front direction in a state where the gripping part is located below the body part, both ends of the support band are outer surfaces of the tool body. The power tool according to claim 1, wherein the power tool is mounted on a dividing plane that can divide the output shaft in a vertical direction.   The electric tool according to claim 1, wherein an end of the support band is detachably attached to the tool main body.   The electric power tool according to any one of claims 1 to 3, wherein the support band has an adjustment mechanism for adjusting the length of the band. The adjustment mechanism portion has a locking projection to be locked to a locked portion provided in the tool body,
The electric tool according to claim 4, wherein the locking protrusion can be hooked on an operator's waist belt.   The power tool according to claim 1, wherein the support band is a rope provided in a safety band. The rope is provided with at least two attachment members,
The one attachment member is attached to the tool body at a position near the front of the electric tool,
The electric tool according to claim 6, wherein the other attachment member is attached to the tool main body at a position near the back surface of the electric tool.

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