JP2004181550A - Portable electric power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electric power tool having a compact latching hook, which portable electric power tool can be surely latched to a waste belt, etc. <P>SOLUTION: The portable electric power tool has a latching hook 16 protrusively arranged on an electric power tool body 1, and can hang the electric power tool body 1 on the waste of an operator 33 by hanging the latching hook 16 on the waste belt 31. The whole latching hook 16 is formed so as to have a wedge shape, in which the thickness T between the contact surface 34 of the latching hook 16 and the outer surface 35 of the latching hook 16 gradually reduces toward the tip end side of the latching hook 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a portable power tool that has a hook for hooking and can be hooked on a waist belt or the like.
[0002]
[Prior art]
Conventionally, there has been proposed a portable power tool in which a hook is projected from a power tool body and the power tool body can be hung by hanging the hook on a waist belt or the like of an operator. (See Patent Document 1). FIG. 10 shows a case in which the tip of a hook 50 projecting from a conventional portable electric tool is inserted between an operator 33 and a waist belt 31 from above and hooked. A larger gap is formed between the worker 33 and the waist belt 31 by the weight of the power tool main body (not shown) toward the upper side, but the tip of the conventional hook 50 has a substantially uniform cross section having a substantially uniform thickness. Because of the rectangular shape, the hook 50 was in contact with the waist belt 31 only at a part of the inner surface 50a thereof, and was easily dropped from the waist belt 31. On the other hand, if the entire length of the hook 50 is increased, the hook 50 can be prevented from dropping off from the waist belt 31. In this case, however, the enlarged hook 50 interferes with the workability. And the like.
[0003]
[Patent Document 1]
JP-A-2002-254358
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object of the present invention is to provide a portable power tool having a compact hook for hooking which can be securely hooked to a waist belt or the like. is there.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention relates to a portable power tool comprising a power tool main body, and a hook for projecting and suspending the power tool main body on a fixed object. The stop hook is formed in a wedge shape such that the thickness decreases toward the tip end. When the waist belt worn by the worker is used as a fixed object, and the hook for hooking the fixed object is used from above, the weight between the fixed object and the worker is determined by the weight of the power tool body. Although a substantially V-shaped gap is generated, by forming the hook for hooking into a wedge shape in this manner, the hook for hooking comes into contact with the fixed object over a wide range, and the gap between the fixed object and the waist belt is increased. Since the frictional force between them is improved, it is possible to reliably prevent the hook from falling off from the fixed object without increasing the size of the hook.
[0006]
Also, the hook for rotation is rotatably mounted on the power tool main body, and the outer surface of the hook for hooking facing the side opposite to the contact surface with the object to be fixed is substantially perpendicular to the rotation axis of the hook for hooking. Is also preferable. In this way, a large gap can be formed between the power tool body and the tip of the hook, and the power tool body can be operated even when the hook is used. It will be easy.
[0007]
It is also preferable to form a non-slip projection on the contact surface of the hook for contact with the object to be fixed. By doing so, the frictional force between the hook for hooking and the object to be fixed can be improved, and the falling off from the object to be fixed can be more reliably prevented.
[0008]
It is also preferable that at least the contact surface side of the hook for contact with the object to be fixed is formed of a non-slip soft body such as elastomer or rubber. By doing so, the frictional force between the hook for hooking and the object to be fixed can be improved, and the falling off from the object to be fixed can be more reliably prevented.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 6 shows an entire portable electric tool according to an embodiment of the present invention. An example of a portable power tool is, for example, an electric driver mainly composed of a power tool main body 1 and a battery pack 2, and a power source is provided in a main body housing 3 forming a substantially T shape of the power tool main body 1. A motor 4 rotatably driven by the electric energy supplied from the battery pack 2; Based on the operation, the work is performed by transmitting the rotational force of the motor 4 to a tip tool (not shown) held on the chuck 7. In the following description, the side where the chuck 7 of the power tool main body 1 is provided is referred to as a front side, and the side where the battery pack 2 is connected is referred to as a lower side.
[0010]
As shown in FIGS. 7 and 8, a hook holding portion 8 extends rearward on a back surface of a grip portion 3 a which is a grip portion of the main body housing 3. The hook holding portion 8 has a substantially cylindrical shape with through holes 9 opened on both sides, and is formed simultaneously with the same resin as the main body housing 3. The central hole 10 and the side holes 11, 11 constituting the through hole 9 are formed to have a smaller diameter through the stepped portions 12, 12 than the side holes 11, 11, and the smaller diameter. Center hole 10 is an insertion hole 13 of a hook 16 for hooking which will be described later. In addition, engaging portions 14, 14 having corrugated irregularities are projected from the both step portions 12, 12 in the axial direction of the insertion hole 13, respectively. Are recessed so that the rotation regulating grooves 15 extend in the circumferential direction.
[0011]
The hook 16 is mainly composed of a substantially U-shaped handle portion 17 and a substantially cylindrical shaft portion 18 protruding from a base portion thereof. Further, the shaft portion 18 includes a root portion 19 and a distal end portion 20, and the distal end portion 20 is formed to have a smaller diameter than the root portion 19 via a step portion 21. The distal end portion 20 is fitted in the insertion hole 13 and is rotatable about the shaft in this fitted state. The root portion 19 has a rotation regulating rib 22 protruding from a side surface thereof. The rotation restricting rib 22 is located in the rotation restricting groove 15 when the distal end portion 20 and the insertion hole 13 are fitted, and is rotatable and slidable in the rotation restricting groove 15. The stepped portion 21 is provided with an engaged portion 25 having a corrugated shape in the axial direction facing the distal end portion 20 side of the shaft portion 18, and the engaging portion 14 in the fitted state of the distal end portion 20 and the insertion hole 13. It is formed so that it can be engaged oppositely. Further, a metal screw 23 is insert-molded on the shaft portion 18, and the metal screw 23 is partially protruded from the front end of the front end portion 20 constituting the shaft portion 18 to form a high-strength screw portion 24. If there is no problem in terms of strength, the threaded portion 24 may be integrally formed using aluminum die-cast or reinforced plastic, which is the same material as the other portions of the hook 16.
[0012]
In a state where the distal end portion 20 of the shaft portion 18 is fitted into the insertion hole 13 and the engaging portion 14 and the engaged portion 25 are engaged, the threaded portion 24 of the shaft portion 18 It is located at the opening of the side hole 11 (hereinafter referred to as side hole 11 ′) on the opposite side of the side hole 11, 11 on the side where the engaged portion 25 is located. In the retaining portion 26 formed by insert-molding the metal nut 30, the female screw portion on the inner peripheral side of the metal nut 30 is exposed to form a high-strength threaded portion 27. The threaded portion 27 and the shaft portion The retaining portion 26 is fixed to the shaft portion 18 by screwing the screw 18 with the screw portion 24. If there is no problem in strength, the threaded portion 25 may be integrally formed using aluminum die cast or reinforced plastic, which is the same material as the other portions of the retaining portion 26. A groove 28 is recessed in the retaining portion 26, and a coin or the like is fitted into the groove 28 and rotated to be easily detachable from the shaft 18.
[0013]
When the retaining portion 26 is fixed to the shaft portion 18 as described above, the engaging portion 14 in the side hole 11 ′ of the hook holding portion 8 and the engaging portion 14 of the retaining portion 26 The elastic body 29 is compressed and disposed between the opposite portions. The elastic body 29 is, for example, a rubber tube, a plate spring, or a coil spring. The urging force generated by the elastic body 29 is a force for urging the retaining portion 26 and the hook 16 integrally in the direction A in the drawing. Accordingly, the engaged portion 25 is pressed against the engaging portion 14.
[0014]
In order to attach the hook 16 to the power tool main body 1, the shaft portion 18 of the hook 16 is inserted into the through hole 9 of the hook holding portion 8 from one side hole 11 side. In a state where the engaging portion 14 on the side hole 11 side and the engaged portion 25 are engaged with each other, an elastic body 29 is inserted into the other side hole 11 ′ side, and the elastic body 29 is attached to the hook holding portion. The retaining portion 26 may be screwed into the threaded portion 24 of the shaft 18 while being compressed between the shaft 8 and the shaft 8. Here, when a coil spring is used as the elastic body 29, it is preferable to use a left-handed elastic body 29 and polish its tip. This is because, when the elastic body 29 is a coil spring, the elastic body 29 may move in such a manner as to pierce the tip of the hook holding portion 8 in conjunction with the rotation of the retaining portion 26, which may hinder the work. Because there is.
[0015]
Since the engagement portion 14 and the engaged portion 25 are engaged with each other while being urged in the engagement direction by the urging force of the elastic body 29 in the above-described state in which the attachment of the hook 16 is completed. Even if a rotational load is applied to the handle portion 17 of the hook 16, the hook 16 is retained at the angle with the power tool body 1 at the same angle as long as the rotational load does not exceed a predetermined value. Is done. When the rotational load applied to the handle portion 17 exceeds a predetermined value, the engagement between the engaging portion 14 and the engaged portion 25 is released against the urging force of the elastic body 29, and the engaged The engaging portion 25 rotates while climbing over the engaging portion 14, and thereafter, the engaging portion 14 and the engaged portion 25 are reengaged by the urging force of the elastic body 29 in a different meshing state from before the rotation. Since the engaging portion 14 and the engaged portion 25 have a corrugated shape in which a large number of concavities and convexities are continuously provided in the circumferential direction, the hook 16 is positioned at multiple angles with respect to the power tool body 1. In this case, the engaging portion 14 and the engaged portion 25 can be engaged with each other in the corresponding meshing state to lock the hook 16 at that angle, and further, a rotational load of a predetermined value or more can be applied. If given, any other angle can be changed without problems by rotation. As the predetermined value of the rotational load, taking into account that the portable electric tool to be used by being hooked on the waist belt 31 or the like as the fixed object 32 is limited to a small one from the viewpoint of safety, the hook for hooking 16 is used. It is sufficient that the angle is not easily changed during use.
[0016]
The rotation of the hook 16 around the shaft 18 is restricted within a range in which the rotation restricting rib 22 moves within the rotation restricting groove 15. For example, as shown in FIG. from the position P ₁ to a horizontal, to a position P ₂ in which the handle portion 17 is substantially perpendicular and is rotatable within a range of approximately 90 degrees around the shaft portion 18. At the lower end portion of the main body housing 3 and in the vicinity of the hook holding portion 8, a battery pack mounting portion 3b for connecting the battery pack 2 by fitting is formed to be widest in the left-right direction. When the hook 16 is locked at any angle, the hook 16 is prevented from protruding from the battery pack mounting portion 3b of the main body housing 3 when viewed from above. .
[0017]
In the left-right direction, the width of the battery pack mounting portion 3b is formed so as to substantially match the width of the battery pack 2, so that the end position Q in the left-right direction of the hook 16 is within the width of the battery pack 2. Will be paid. Thus, even when the power tool body 1 is dropped, it is possible to prevent the hanging hook 16 from first colliding with the ground or the like to cause breakage, and to be possible by mounting or not mounting the hanging hook 16. The difference in dimensions that occurs in the entire portable power tool is reduced, and it becomes easy to share a storage case and the like. The position P ₁ of the is a non-use storage position when the latching hook 16, pushing the tip of the handle portion 17 when in the storage position in the battery pack mounting portion 3b of the main body housing 3 against State. As a result, even when the hook 16 is subjected to an impact due to a drop or the like, the load is not concentrated only on the shaft portion 18 but is dispersed also on the tip side, so that the damage of the hook 16 is more reliably prevented. Is to be prevented.
[0018]
Hereinafter, the shape of the hook 16 will be described in more detail. As shown in FIG. 1, the handle portion 17 of the hook 16 is formed to be bent in a substantially rectangular shape, and a bent inner surface 17 a of the handle portion 17 is a contact surface of the hook 16. 34, the bent outer surface 17b of the handle portion 17 is an outer surface 35 facing the opposite direction to the contact surface 34 of the hook 16 for hooking. When the hook 16 for hooking is hooked from above onto a waist belt 31 which is a fixing object 32 of a portable power tool, the contact surface 34 of the hook 16 for hooking comes into contact with the inner surface 31a of the waist belt 31, The outer surface 35 of the hook 16 comes into contact with the waist surface 33a of the worker 33 around which the waist belt 31 is wound, whereby the power tool main body 1 is connected to the waist belt of the worker 33 via the hook 16. 31.
[0019]
As a characteristic configuration of the portable electric tool as one example, the thickness T between the contact surface 34 and the outer surface 35 of the hook 16 is formed so as to become smaller toward the distal end, thereby forming the hook. Reference numeral 16 denotes a wedge having a substantially V-shaped cross section. Normally, the waist belt 31 is hard, and due to the weight of the power tool main body 1 suspended via the hooks 16, the gap 36 between the operator 33 and the waist belt 31 having a substantially V-shaped cross section increases as it goes upward. However, as described above, the hooking hook 16 is formed in a wedge shape having a substantially V-shaped cross section so as to correspond to the shape of the gap 36, so that most of the contact surface 34 is in contact with the inner peripheral surface 31a of the waist belt 31. It comes into contact. As a result, a large frictional force acts between the hook 16 and the waist belt 31, and the falling off of the waist belt 31 is reliably prevented.
[0020]
FIG. 2A shows a case where the outer surface 35 of the hook 16 is provided substantially perpendicular to the rotation axis r of the hook 16, and FIG. The contact surface 34 of the hook 16 is provided substantially perpendicular to the rotation axis r. As described above, the hook 16 for hooking needs to be provided so that the end position Q is within the width of the battery pack 2, so that the grip 3a of the main body housing 3 and the tip of the hook 16 for hooking are provided. If the distance between the case shown in FIG. 2 (a) and _{D 2} when shown in FIG. 2 (b) as _{D 1,} even if an attempt is increased both _D 1, _{D 2} as possible together, resulting in _{D 1} > the _{D 2.} That is, even if the hook 16 is formed in a wedge shape in the same manner, when the outer surface 35 is provided substantially perpendicular to the rotation axis r, the grip portion 3a of the main body housing 3 and the hook 16 A large gap is formed between the hook 5 and the tip of the switch 5 so that the switch 5 can be easily operated even when the hook 16 is used.
[0021]
In order to further increase the frictional force acting between the hook 16 and the waist belt 31 and to prevent the hook 16 from dropping off the waist belt 31, for example, as shown in FIG. What is necessary is just to form many convex parts 37 for non-slip. The shapes of the convex portions 37 are various as viewed from the front, such as those shown in FIGS. 4A to 4C and those having the cross-sectional shapes shown in FIGS. 4D to 4F. The form is applicable. In addition, a protrusion (not shown) similar to the above-mentioned protrusion 37 may be formed on the outer surface 35 side of the hook 16, and in this case, the hook 16 and the waist surface of the worker 35. By increasing the frictional force acting between the waist belt 33a and the waist belt 31, it is possible to more reliably prevent the belt 33 from falling off.
[0022]
In order to further increase the frictional force acting between the hook 16 and the waist belt 31 and prevent the hook 16 from dropping off from the waist belt 31, for example, as shown in FIG. The surface 34 side is preferably formed using a non-slip soft body 38 such as an elastomer or rubber. In addition, the outer surface 35 of the hook 16 may be formed of a soft body (not shown) similar to the soft body 38. In this case, the hook 16 and the waist surface of the worker 35 are formed. By increasing the frictional force acting between the waist belt 33a and the waist belt 31, it is possible to more reliably prevent the belt 33 from falling off. Further, if there is no problem in strength, it is preferable to form the entire hook 16 with a soft body (not shown) similar to the soft body 38 described above.
[0023]
Thus, according to the portable power tool having the above-described characteristic configuration, the power tool main body 1 can be reliably prevented from dropping off from the waist belt 31, and the hook 16 becomes a hindrance. As a result, the workability is not reduced.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the waist belt worn by the worker is used as a fixing target and the hook for hooking the fixing target from above is used, the electric belt is electrically driven. Although a substantially V-shaped gap is formed between the fixed object and the worker due to the weight of the tool body, the hook for hooking can be brought into contact with the fixed object in a wide range corresponding to the gap shape. Further, the large frictional force generated between the fixed object and the waist belt has an effect that the falling off from the fixed object can be surely prevented without increasing the size of the hook for hooking.
[0025]
According to the second aspect of the invention, in addition to the effect of the first aspect, a large gap can be formed between the power tool main body and the tip of the hook. There is an effect that it becomes easy to operate the power tool main body even when the hook for use is used.
[0026]
According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the invention, the frictional force between the hook for hooking and the object to be fixed is improved, so that the object is more securely fixed. There is an effect that it is possible to prevent the object from falling off.
[0027]
Further, in the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the frictional force between the hook for locking and the object to be fixed is improved. This has the effect that the falling-off from the fixed object can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a state in which a portable electric tool according to an embodiment of the present invention is suspended from a waist belt.
FIG. 2 is an explanatory view showing a distance between a hook and a grip portion of the portable electric tool according to the first embodiment, and (a) shows an outer surface of the hook and a rotation axis of the hook; (B) is a case where the contact surface of the hook for hooking is provided substantially perpendicular to the rotation axis of the hook for hooking.
FIG. 3 is an explanatory view showing a state in which the portable electric tool is suspended from a waist belt when a non-slip projection is provided on a contact surface of the portable electric tool.
4A and 4B are explanatory views of the above-mentioned convex shape, in which (a) to (c) are shapes when viewed from the front, and (d) to (f) are cross-sectional shapes.
FIG. 5 is an explanatory view showing a state in which the portable electric tool is suspended from a waist belt when the contact surface side is formed of a soft material for preventing slippage.
FIG. 6 is a perspective view showing the entire portable power tool of the above.
FIG. 7 is a partially exploded perspective view of the portable electric power tool.
FIG. 8 is a horizontal sectional view showing a connection structure of a hook in the portable electric tool according to the first embodiment.
FIG. 9 is an explanatory view showing a locking position of a hook in the portable electric tool according to the first embodiment.
FIG. 10 is an explanatory view showing a state in which a conventional portable electric tool is suspended from a waist belt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power tool main body 16 Hook 32 for fastening 32 Object to be fixed 34 Contact surface 35 Outer surface 37 Convex part 38 Soft body r Rotation axis T Thickness

Claims (4)

In a portable power tool, a hook for projecting and suspending the power tool body on an object to be fixed is protruded from the power tool body. A portable power tool formed in a wedge shape. A hook for rotation is rotatably mounted on the power tool body, and an outer surface of the hook for hooking, which is opposite to a contact surface with the object to be fixed, is provided substantially perpendicular to a rotation axis of the hook for hooking. The portable power tool according to claim 1, wherein: The portable power tool according to claim 1 or 2, wherein a protrusion for preventing slippage is formed on a contact surface of the hook for contact with the object to be fixed. The portable power tool according to any one of claims 1 to 3, wherein at least a contact surface side of the hook for contact with the object to be fixed is formed of a non-slip soft body such as an elastomer or rubber. .

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