JP2006082195A - Protector structure for hand-held tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protector structure capable of surely preventing a hand-held tool from being damaged when accidentally dropped in the T-shaped hand-held tool which is, for example, a relatively heavy hand-held tool such as a large impact wrench and in which a handle part is provided to the side part of a tool body in a state of protruding to a side. <P>SOLUTION: A tip protector 40 is mounted to the tip of the tool body 10. A rear-end protector 50 is mounted to the rear end of the tool body 10. A handle protector 60 is mounted to the tip of the handle part 20. By this structure, it is possible to further surely protect a part which is most likely to collide with a floor surface or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a protector structure for protecting a housing from an impact at the time of dropping in a hand-held tool having a relatively large overall weight, such as a large impact wrench.

Conventionally, as a technique related to this type of protector structure, for example, Japanese Utility Model Laid-Open No. 55-70970 discloses a configuration in which a cover is attached to a front end portion and a rear end portion of a tool body. Japanese Patent Laid-Open No. 2004-122279 discloses a configuration in which a protector for the purpose of shock absorption or the like is attached to the rear end portion of the tool body and the front end of the handle portion.
Japanese Utility Model Publication No.55-70970 JP 2004-122279 A

However, when the above conventional protector structure is applied to, for example, a relatively large hand-held tool having an overall weight of about 8 kg, the shock absorbing capacity at the time of dropping or the like is insufficient, and a larger shock absorbing capacity is provided. It was necessary to adopt a protector structure.
The present invention has been made in view of this problem, and an object of the present invention is to provide a protector structure that is a hand-held tool having a relatively large overall weight and that exhibits a sufficient shock absorbing capability against an impact when dropped. And

For this reason, this invention was taken as the protector structure of the structure described in each claim of a claim.
According to the protector structure of the first aspect, the protectors are attached to the three positions, that is, the front end portion and the rear end portion of the tool main body and the front end of the handle portion. Of the three protectors, the protectors at the front end and the rear end of the tool main body are attached over the entire circumference of the front end corner and the rear end corner of the tool main body. For this reason, when the hand-held tool is accidentally dropped, the impact is absorbed by these protectors even when the tip corner or the rear corner of the tool body collides with the floor surface or the like.
Further, when the handheld tool is dropped, even if the tip of the handle collides with the floor surface or the like, the impact is absorbed by the handle protector. The handle protector has a block body shape and is attached to the tip of the handle portion. Therefore, the handle protector absorbs an impact when the tip of the handle portion collides with the floor surface or the like when dropped.
In this way, because it is protected by three protectors each with sufficient shock absorption capability, even a relatively large hand-held tool with a weight of, for example, about 8 kg is sufficient for impact when dropped. Can exhibit a strong shock absorbing ability.
According to the protector structure of the second aspect, in addition to the above-described effects, the impact absorbing ability of the rear end portion of the tool body can be increased without deteriorating the cooling performance of the electric motor as the drive source.
According to the protector structure of the third aspect, in addition to the function and effect of the configuration according to the first aspect, the cover of the window portion for replacing the motor brush provided on the side near the rear end of the normal tool body is dropped and damaged. Can be prevented.
According to the protector structure of the fourth aspect, in addition to the operation and effect of the configuration according to the first aspect, the connection portion (base end portion) of the power cord with respect to the handle distal end is protected by the handle protector. Therefore, the power cord is prevented from being damaged.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 show an impact wrench 1 provided with a protector structure P of the present embodiment described below. In this example, a large impact wrench 1 is illustrated as an example of a hand-held tool.
The impact wrench 1 includes a tool body 10 having a substantially cylindrical shape, and a handle portion 20 and an auxiliary handle portion 30 provided so as to protrude from a side portion of the tool body 10. The impact wrench 1 of this example is characterized by a protector structure P including a front end protector 40, a rear end protector 50 attached to the tool body 10, and a handle protector 60 attached to the front end of the handle portion 20. The basic configuration and the like of the main body 10 and the handle portion 20 are the same as those of the conventional configuration, and no particular change is required in the present embodiment. Therefore, the basic configuration of the tool body 10 and the handle portion 20 will be briefly described.
The tool body 10 incorporates an electric motor 12 as a drive source inside a cylindrical body case 11. On the rear end surface of the main body case 11, air intake ports 11a to 11a for cooling the motor are provided. The output of the electric motor 12 is transmitted to the output shaft 14 via the striking mechanism 13. The striking mechanism 13 has a function of converting the rotational output of the motor into a striking motion in the rotational direction and transmitting it to the output shaft 14. The output shaft 14 is rotatably provided in a state where the distal end side protrudes from the distal end surface of the sleeve 15 provided at the distal end of the main body case 11. A socket for screw tightening is attached to the output shaft 14. A front end protector 40 is attached to the outer peripheral surface of the sleeve 15, and a rear end protector 50 is attached to the rear end portion of the main body case 11.

FIG. 3 shows the tip protector 40 in a detached state alone. The tip protector 40 is made of elastic rubber and has a substantially truncated cone shape having an insertion hole 40a for inserting the output shaft 14 at the tip and an opening 40b for fitting the sleeve 15 at the rear end. It has a bowl shape. The tip protector 40 covers almost the entire sleeve 15. An engaging portion 40c that rises toward the inner periphery is formed at the periphery of the opening 40b of the tip protector 40. As shown in FIG. 2, the tip protector 40 is held attached to the outer peripheral side of the sleeve 15 by fitting the engaging portion 40 c into the engaging recess 15 a formed on the outer peripheral surface of the sleeve 15.
By attaching the tip protector 40, the tip corner of the tool body 10 is covered by the tip protector 40 over the entire circumference. For this reason, when the handheld tool 1 is accidentally dropped, for example, the impact when the tip of the tool body 10 collides with the floor surface or the like is absorbed.

Next, the rear end protector 50 removed from the rear end of the main body case 11 is shown alone in FIG. The rear end protector 50 is formed of an elastic rubber material like the front end protector 40, and has a bowl shape having an opening 50a for fitting the rear end portion of the main body case 11 on the front end side. Yes. The rear end of the rear end protector 50 is formed with an escape hole 50b for exposing the air intake ports 11a to 11a formed on the rear surface of the main body case.
In addition, two lid portions 50c and 50c are provided in the opening 50a of the rear end case 50 so as to face each other. The lid portions 50c and 50c have a function of closing the motor brush replacement windows 11b and 11b provided on the side surface near the rear portion of the main body case 11 when attached to the rear end portion of the main body case 11. Yes. Both the lid portions 50c and 50c are held in a state of closing the window portion 11b by their elastic force. According to the lid portions 50c and 50c, it is possible to prevent the disc-shaped lid that is usually screwed into the window portion 11b from being loosened and dropped off from the window portion 11b.
By attaching the rear end protector 50 to the rear end of the tool main body 10, the rear end corner of the tool main body 10 is covered over the entire circumference. For this reason, when the hand-held tool 1 is accidentally dropped, for example, the impact when the rear end corner portion of the tool body 10 collides with the floor surface or the like is absorbed.
Further, since the rear end protector 50 is provided with the escape holes 50b, the air intake ports 11a to 11a of the main body case 11 are not blocked, so that the motor cooling function of the tool main body 10 is not impaired.

The handle portion 20 is provided so as to protrude laterally from a position approximately in the middle of the tool body 10 in the longitudinal direction. The handle portion 20 is a rod-shaped member having a thickness and a length that can be easily gripped by the user when the impact wrench 1 is carried or when a screw tightening operation is performed using the impact wrench 1. Is formed. A handle protector 60 is attached to the tip of the handle portion 20. In FIG. 5, the handle protector 60 is shown as being detached from the tip of the handle portion 20.
The handle protector 60 is formed by molding an elastic rubber into a block body shape, and an engagement edge portion 60a for the tip of the handle portion 20 is provided at the center of the upper surface. The handle protector 60 is attached to the distal end of the handle portion 20 by being fitted into an engagement recess 20 a provided on the distal end surface of the handle portion 20 while elastically deforming the engagement edge portion 60 a. Further, the handle protector 60 can be detached from the handle portion 20 by pulling out from the engagement recess portion 20a while deforming the engagement edge portion 60a.
Further, the outer diameter (thickness) of the handle protector 60 is set to be larger than the outer diameter (thickness) of the handle portion 20, and the handle protector 60 is provided in a state of projecting laterally from the side surface of the handle portion 20. ing. For this reason, even when the handheld tool 1 is accidentally dropped, the handle protector 60 collides with the floor surface or the like, so that the handle portion 20 does not directly collide with the floor surface or the like. The impact from the outside with respect to the handle part 20 can be reduced.
In the center of the handle protector 60, an insertion hole 60b for inserting the power cord 21 is formed penetrating in the thickness direction. By inserting the base end portion 21a of the power cord 21 into the insertion hole 60b, the base end portion 21a is prevented from being bent or damaged. As shown in FIG. 2, the base end portion 21 a of the power cord 21 enters the handle portion 20 while being covered with the rubber cover 21 b, and is electrically connected to the tool body 10 side inside the handle portion 20. It is connected to the.
The auxiliary handle 30 is attached by winding an attachment band 31 around the tool body 10 on the distal end side of the handle portion 20. The auxiliary handle 30 extends parallel to the same direction of the handle portion 20. The auxiliary handle 30 is disposed substantially parallel to the handle portion 20. The operator holds the handle portion 20 with one hand and holds the auxiliary handle 30 with the other hand.

According to the protector structure of the present embodiment configured as described above, the tip protector 40 is attached to the distal end portion of the tool body 10, and the rear end protector 50 is attached to the rear end portion. Both protectors 40 and 50 respectively cover the front end corner and the rear end corner of the tool body 10 over the entire circumference. Further, a handle protector 60 is attached to the tip end of the handle portion 20 provided so as to protrude in a T shape from the side portion of the tool body 10. That is, for example, when the hand-held tool 1 is accidentally dropped, portions that are most likely to collide with the floor surface or the like, that is, the tip end portion, the rear end portion of the tool main body 10 and the tip end portion of the handle portion 20 respectively. Since it is covered with the protectors 40, 50, 60, the handheld tool 1 can be more reliably prevented from being damaged by absorbing the impact at the time of collision by the protectors 40, 50, 60.
As described above, since the three tip portions of the hand-held tool 1 having a substantially T-shape are protected by the protectors 40, 50 and 60, respectively, even a relatively large hand-held tool 1 having a weight of about 8 kg, for example. In addition, it is possible to exhibit a sufficient shock absorbing ability with respect to an impact at the time of dropping or the like.
Moreover, since the escape hole 50b is provided in the rear end protector 50, and the air intake ports 11a to 11a of the main body case 11 are not blocked, the motor cooling function of the tool main body 10 is not impaired.
Further, since the motor brush replacement windows 11b and 11b are closed by the two lids 50c and 50c provided on the rear end protector 50, the disk-shaped disk is usually screwed into the window parts 11b and 11b. It is possible to prevent the lid window portion 11b from being loosened or dropped off.
Further, the base end portion 21b of the power cord 21 is inserted into the insertion hole 60b of the handle protector 60 attached to the tip end of the handle portion 20, and the base end portion 21b is protected against bending. That is, since the connection portion (base end portion 21b) of the power cord 21 with respect to the handle distal end is protected by the handle protector 60, the base end portion 21b is not greatly bent, thereby damaging the power cord 21. Can be prevented.

Various modifications can be made to the embodiment described above. For example, although a relatively large impact wrench is illustrated as a hand-held tool, it can be applied to a hand-held tool for performing various other operations such as an impact driver or a hand-held cutting machine.
Moreover, the cover parts 50c and 50c provided in the rear end protector 50 can be omitted.
Further, the configuration in which the handle protector 60 is provided with the insertion hole 60b and the power cord 21 is inserted into the insertion hole 60b to prevent the base end portion 21a of the power cord 21 from being bent is exemplified. In the case where the handle protector 60 is omitted, the handle protector 60 without the insertion hole 60b may be attached to the tip of the handle portion 20.

It is a whole side view of a hand-held tool provided with a protector structure concerning an embodiment of the present invention. It is a whole side view of a hand-held tool provided with a protector structure concerning an embodiment of the present invention. In this figure, a front end protector, a rear end protector, a handle protector, and a portion to which these are attached are shown in a longitudinal section. It is a whole perspective view of a tip protector. It is the whole rear end protector perspective view. It is a whole perspective view of a handle protector.

Explanation of symbols

1 ... Hand tool (impact wrench)
DESCRIPTION OF SYMBOLS 10 ... Tool main body 11 ... Main body case, 11a ... Air intake port, 11b ... Window part 12 ... Electric motor 13 ... Blowing mechanism 14 ... Output shaft 15 ... Sleeve 20 ... Handle part, 20a ... Engaging recessed part 21 ... Power supply cord, 21a ... Base end part, 21b ... Rubber cover 30 ... Auxiliary handle 40 ... Tip protector, 40a ... Insertion hole, 40b ... Opening part, 40c ... Engagement part 50 ... Rear end protector, 50a ... Opening part, 50c ... Lid part 60 ... Handle protector, 60a ... engagement edge, 60b ... insertion hole P ... protector structure

Claims (4)

In a hand tool having a tool body provided with an output shaft at the tip and a handle portion protruding from the side of the tool body,
A shock absorbing protector is attached to each of the tip and rear ends of the tool body and the tip of the handle,
The tip protector attached to the tip end portion of the tool body and the rear end protector attached to the rear end portion of the tool body are each attached so as to cover the tip corner portion and the rear end corner portion of the tool body over the entire circumference. ,
A protector structure in which the handle protector attached to the distal end portion of the handle portion has a block body shape and is attached to the distal end surface of the handle portion. The protector structure according to claim 1, wherein the rear end protector is configured to be attached to avoid a cooling air intake provided on a rear surface of a tool main body incorporating an electric motor as a drive source. . The protector structure according to claim 1, wherein the rear end protector is configured to prevent the lid from dropping off and damaging the motor brush replacement window provided on the side of the tool main body incorporating the electric motor as a drive source. Protector structure with lid protector to prevent. It is a protector structure of Claim 1, Comprising: The layer through-hole is provided in the center of a handle protector, The power cord connected to the front-end | tip of the said handle part is penetrated in this insertion hole, The base end part of this power cord is made into The protector structure is designed to protect.

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