JP4016603B2 - Impact tool - Google Patents
Impact tool Download PDFInfo
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- JP4016603B2 JP4016603B2 JP2001076251A JP2001076251A JP4016603B2 JP 4016603 B2 JP4016603 B2 JP 4016603B2 JP 2001076251 A JP2001076251 A JP 2001076251A JP 2001076251 A JP2001076251 A JP 2001076251A JP 4016603 B2 JP4016603 B2 JP 4016603B2
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- Prior art keywords
- holder
- diameter portion
- end surface
- impact tool
- impact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】
【発明の属する技術分野】
本発明は、中間子を介して打撃子による打撃エネルギーを先端工具に伝達し、更に該中間子の跳ね返りを緩衝材を介してハンマホルダで受ける構成をした衝撃工具に関するものである。
【０００２】
【従来の技術】
従来の衝撃工具は、特開平９−２６７２７３号公報にあるように、電動機と、電動機の駆動を受け駆動し、シリンダ内を往復動するピストンと、ピストンの往復動が空気室を介して伝達される打撃子と、打撃子と直接衝突して先端工具に打撃エネルギーを伝達し、小径部及び大径部を持つ中間子とを有した構成をし、中間子の大径部と中間子の小径部を覆う形状をしたホルダの端面部との間に緩衝材を設け、この緩衝材によって中間子の後退位置を規制するようにした構成をしたものであった。
【０００３】
【発明が解決しようとする課題】
上記した従来の衝撃工具では、上記したように緩衝材によって中間子の後退位置を規制するようにした構成であるため、先端工具に過剰な押付け力が作用する、あるいは長期間作業を行ったこと等により、緩衝材が過大に変形したり、劣化、溶解等によりその軸方向厚みが減少してしまうと、中間子の後退位置がピストン側へと移動して、中間子の後方への移動量が増加してしまい、打撃子とピストンとの間の空気室の容積が小さくなることで空気の圧縮力が大きくなり、打撃子の打撃エネルギーが増加し、中間子の寿命、及び本体寿命を短くしてしまうという問題があった。
【０００４】
本発明の目的は、上記欠点を解消し、上記した緩衝材の変形、劣化等により緩衝材の厚みが減っても打撃エネルギーの増加を抑え、本体の長寿命化を図ることができる衝撃工具を提供することである。
【０００５】
【課題を解決するための手段】
上記目的は、中間子の小径部と大径部との間にドリルの内径寸法よりも外径寸法の大きい段差部を設け、緩衝材の軸方向寸法が設定寸法以下となった際に、ホルダ端面に段差部が当接し、この当接により中間子の後退位置が規制されるようにすることにより達成することができる。
【０００６】
【発明の実施の形態】
以下本発明衝撃工具の一実施形態を図１〜図３を用いて説明する。なお、図１は本発明衝撃工具の一実施形態の要部を示す縦断面側面図、図２及び図３は本発明衝撃工具の一動作状態を示す図１の要部拡大図である。
【０００７】
図に示すように工具本体１に固定されたフロントカバー３にはハンマホルダ５が軸支され、ハンマホルダ５には中間子６が軸支され、中間子６は工具本体１内において工具軸方向に摺動可能となっている。
【０００８】
工具本体１内に固定されたシリンダ９内には、図示しない電動機の駆動を受け往復動するピストン１１、ピストン１１との往復動に追従して間に位置する空気室１２を介して駆動する打撃子１０が設けられており、打撃子１０は中間子６を直接打撃し、中間子６から先端工具２に打撃エネルギーが伝達される。
【０００９】
シリンダ９の端面にはホルダ８が設けられており、ホルダ８と中間子６との間には緩衝部材であるダンパ７が位置している。
【００１０】
なお、図示する１３は先端工具２を工具本体１内に保持するためのリテーナスリーブであり、リテーナスリーブ１３には先端工具２を保持するボール１４が設けられ、リテーナスリーブ１３はスプリング１５により常時先端側に付勢されている。
【００１１】
中間子６は図に示すように、打撃子１０側から順に小径部６ａ、大径部６ｂ、中径部６ｃ、最小径部６ｄからなる形状をしており、上記したハンマホルダ５は中径部６ｃよりも大きく大径部６ｂよりも小さい内径寸法を持つ構成となっており、上記したホルダ８は小径部８ａよりも大きく大径部８ｂよりも小さい内径寸法を持つ構成となっている。中間子６はこのハンマホルダ５とホルダ８の内部において常時工具本体１内で工具軸方向に摺動可能なように支持されている。
【００１２】
先端工具２を被削材に押付けていない状態、すなわち先端工具２に打撃子１０側への押圧力が加わっていない状態での中間子６の前方位置は、中間子６の大径部６ｂがハンマホルダ５に突き当ることにより規制され、ハンマホルダ５とフロントカバー３との間に位置するダンパ４によって中間子６の大径部６ｂとハンマホルダ５との衝突時の衝撃は緩和される。
【００１３】
先端工具２を被削材に押付けた状態、すなわち先端工具２に打撃子１０側への押圧力を加えた状態、もしくは先端工具２を打撃した後の中間子６の後方への跳ね返り時の中間子６の後方位置は、図２に示すように中間子６の大径部６ｂがホルダ８の端部との間に位置する緩衝部材であるダンパ７に突き当ることにより規制され、ダンパ７によってこの衝突時の衝撃は緩和される。
【００１４】
ホルダ８は中間子６の小径部６ａ外周を覆う内径の部分８ａが硬質材により形成された硬質材製スリーブ（本実施形態では金属スリーブ８ａである）となっており、他の部分については工具の軽量化等を図る目的から樹脂等の軽量の部材により形成されており、これらは一体に形成されている。
【００１５】
図２に示すように中間子６の小径部６ａと大径部６ｂとの間には、ホルダ８の金属スリーブ８ａの内径寸法よりも大きい外径寸法を持った段差部６ｅが設けられている。
【００１６】
図２に示す状態は、ダンパ７が初期状態にある際の中間子６の大径部６ｂとダンパ７との衝突時の状態を示しているが、中間子６の大径部６ｂとホルダ８との間におけるダンパ７の軸方向厚みがダンパ７の変形や劣化等によりある一定寸法以下となると、図３に示すように中間子６の段差部６ｂが金属スリーブ８ａの端面部８ｂに当接し、中間子６の後退位置の規制をダンパ７ではなく、段差部６ｂと金属スリーブ８ａの端部８ｂとの当接により行うようにしたので、ダンパ７が変形や劣化等により軸方向寸法が減少したとしても、中間子６の後方への移動量がある一定以上はピストン１１側へ移動することはないので、打撃子１０とピストン１１との間の空気室１２の容積が小さくなることによる打撃子１０の打撃エネルギーが増加してしまうことを抑制することができるので、中間子６の寿命及び本体寿命の向上を図ることができるようになる。
【００１７】
なお、図２及び図３に示すように、中間子６の段差部６ｅの形状を打撃子１０から離れる方向に傾斜した傾斜面を有する形状とすると共に、ホルダ８の金属スリーブ８ａの端面部８ｂの形状を段差部６ｅに相対するよう傾斜した形状とすることにより、段差部６ｅとホルダ８との衝突時に段差部６ｅ及び金属スリーブ８ａの端面部８ｂが破損してしまうことを抑制することができる。
【００１８】
なお、中間子６の大径部６ｂとホルダ８の端面との間に位置するダンパ７の軸方向厚さが図３に示すようにＡ寸法となった際に、上記したように段差部６ｅとホルダ８の端面部８ｂとが当接し、本実施形態では図２に示す状態から段差部６ｅと金属スリーブ８ａの端面部８ｂとの間のＢ寸法分ダンパ７の軸方向厚さが減少した際に段差部６ｅとホルダ８の端面部８ｂとが当接するようになる。
【００１９】
なお、上記実施形態では、段差部６ｅ及びホルダ８の端面部８ｂの形状を傾斜面を設けた形状としたが、傾斜面を設けない形状とした場合には、段差部６ｅは、初期状態にあるダンパ７の軸方向厚さよりも小さい寸法分大径部６ｂから打撃子１０側に位置した個所に設けられるようになる。
【００２０】
【発明の効果】
本発明によれば、中間子の小径部と大径部との間にドリルの内径寸法よりも外径寸法の大きい段差部を設け、緩衝材の軸方向寸法が設定寸法以下となった際に、ホルダ端面に段差部が当接し、この当接により中間子の後退位置が規制されるようにすることにより、緩衝材の変形、劣化等により緩衝材の厚みが減っても打撃エネルギーの増加を抑え、本体の長寿命化を図ることができる衝撃工具を提供ができるようになる。
【図面の簡単な説明】
【図１】本発明衝撃工具の一実施形態を示す縦断側面図。
【図２】本発明衝撃工具の一動作状態を示す図１の要部拡大断面図。
【図３】本発明衝撃工具の一動作状態を示す図１の要部拡大断面図。
【符号の説明】
１は工具本体、２は先端工具、３はフロントカバー、６は中間子、６ａは小径部、６ｂは大径部、６ｅは段差部、７はダンパ、８はホルダ、８ａは金属スリーブ、８ｂは端面部、９はシリンダ、１０は打撃子、１１はピストンである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impact tool configured to transmit striking energy generated by a striking element to a tip tool via an intermediate element, and to receive a bounce of the intermediate element with a hammer holder via a cushioning material.
[0002]
[Prior art]
As disclosed in Japanese Patent Application Laid-Open No. 9-267273, a conventional impact tool is driven by an electric motor, a piston that reciprocates within a cylinder, and a reciprocating motion of the piston is transmitted through an air chamber. A striking element that directly collides with the striking element to transmit striking energy to the tip tool, and has a small diameter part and a meson having a large diameter part, and covers the large diameter part of the meson and the small diameter part of the meson. A cushioning material was provided between the end face of the shaped holder, and the retracted position of the meson was regulated by this cushioning material.
[0003]
[Problems to be solved by the invention]
The above-described conventional impact tool has a configuration in which the retreat position of the meson is regulated by the cushioning material as described above, so that excessive pressing force acts on the tip tool or the work has been performed for a long time. If the buffer material is deformed excessively or its axial thickness decreases due to deterioration, melting, etc., the retracted position of the meson moves to the piston side and the amount of movement of the meson increases to the rear. Therefore, the volume of the air chamber between the striking element and the piston is reduced, so that the compression force of the air is increased, the striking energy of the striking element is increased, and the life of the intermediate element and the life of the main body are shortened. There was a problem.
[0004]
An object of the present invention is to provide an impact tool capable of eliminating the above-mentioned drawbacks and suppressing an increase in impact energy even when the thickness of the buffer material is reduced due to deformation, deterioration, etc. of the above-described buffer material, and extending the life of the main body. Is to provide.
[0005]
[Means for Solving the Problems]
The purpose is to provide a stepped portion having a larger outer diameter than the inner diameter of the drill between the small diameter portion and the large diameter portion of the meson, and when the axial dimension of the cushioning material is equal to or less than the set dimension, the end face of the holder This can be achieved by abutting the stepped portion on the surface and regulating the retracted position of the meson by this contact.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the impact tool of the present invention will be described below with reference to FIGS. 1 is a longitudinal sectional side view showing a main part of an embodiment of the impact tool of the present invention, and FIGS. 2 and 3 are enlarged views of the main part of FIG. 1 showing one operation state of the impact tool of the present invention.
[0007]
As shown in the figure, a hammer holder 5 is pivotally supported on the front cover 3 fixed to the tool body 1, and an intermediate element 6 is pivotally supported on the hammer holder 5. The intermediate element 6 can slide in the tool axis direction within the tool body 1. It has become.
[0008]
In a cylinder 9 fixed in the tool body 1, there is a piston 11 that reciprocates under the drive of an electric motor (not shown), and an impact driven through an air chamber 12 positioned between the piston 11 and the piston 11 that reciprocates. A child 10 is provided, and the striker 10 directly strikes the intermediate piece 6, and impact energy is transmitted from the intermediate piece 6 to the tip tool 2.
[0009]
A holder 8 is provided on an end surface of the cylinder 9, and a damper 7 serving as a buffer member is located between the holder 8 and the intermediate element 6.
[0010]
Reference numeral 13 denotes a retainer sleeve for holding the tip tool 2 in the tool body 1, and the retainer sleeve 13 is provided with a ball 14 for holding the tip tool 2. Is biased to the side.
[0011]
As shown in the figure, the meson 6 has a shape composed of a small diameter portion 6a, a large diameter portion 6b, an intermediate diameter portion 6c, and a minimum diameter portion 6d in this order from the striker 10 side. The hammer holder 5 described above has an intermediate diameter portion 6c. The holder 8 has a larger inner diameter than the large-diameter portion 6b, and the holder 8 has a larger inner diameter than the small-diameter portion 8a and smaller than the large-diameter portion 8b. The meson 6 is supported inside the hammer holder 5 and the holder 8 so as to be slidable in the tool axis direction in the tool body 1 at all times.
[0012]
When the tip tool 2 is not pressed against the work material, that is, when the pressing force to the striker 10 side is not applied to the tip tool 2, the large-diameter portion 6 b of the intermediate piece 6 is positioned at the hammer holder 5. The damper 4 placed between the hammer holder 5 and the front cover 3 reduces the impact at the time of the collision between the large diameter portion 6b of the intermediate element 6 and the hammer holder 5.
[0013]
A state in which the tip tool 2 is pressed against the work material, that is, a state in which a pressing force is applied to the tip tool 2 toward the striker 10 side, or an intermediate member 6 when the tip 6 bounces back after the tip tool 2 is struck. 2, the large diameter portion 6b of the intermediate element 6 is regulated by abutting against a damper 7 which is a buffer member positioned between the end of the holder 8 as shown in FIG. The shock of is reduced.
[0014]
The holder 8 is a hard material sleeve (a metal sleeve 8a in the present embodiment) in which an inner diameter portion 8a covering the outer periphery of the small diameter portion 6a of the meson 6 is formed of a hard material, and the other portions are made of tools. For the purpose of reducing weight and the like, it is formed of a lightweight member such as resin, and these are formed integrally.
[0015]
As shown in FIG. 2, a step portion 6 e having an outer diameter larger than the inner diameter of the metal sleeve 8 a of the holder 8 is provided between the small diameter portion 6 a and the large diameter portion 6 b of the intermediate element 6.
[0016]
The state shown in FIG. 2 shows a state at the time of a collision between the large-diameter portion 6b of the intermediate element 6 and the damper 7 when the damper 7 is in the initial state. When the axial thickness of the damper 7 between them becomes below a certain dimension due to deformation or deterioration of the damper 7, the stepped portion 6b of the meson 6 contacts the end surface portion 8b of the metal sleeve 8a as shown in FIG. Since the regulation of the retreat position is not performed by the damper 7 but by the contact between the step portion 6b and the end portion 8b of the metal sleeve 8a, even if the damper 7 is deformed or deteriorated, the axial dimension is reduced. Since the amount of movement of the intermediate element 6 in the rearward direction does not move to the piston 11 side beyond a certain level, the impact energy of the impactor 10 due to the volume of the air chamber 12 between the impactor 10 and the piston 11 being reduced. Has increased It is possible to suppress the Ukoto, it is possible to improve the life and body the life of the intermediate element 6.
[0017]
As shown in FIGS. 2 and 3, the shape of the stepped portion 6 e of the intermediate element 6 is a shape having an inclined surface inclined in a direction away from the striker 10 and the end surface portion 8 b of the metal sleeve 8 a of the holder 8. By making the shape inclined so as to face the stepped portion 6e, it is possible to prevent the stepped portion 6e and the end surface portion 8b of the metal sleeve 8a from being damaged when the stepped portion 6e and the holder 8 collide. .
[0018]
When the axial thickness of the damper 7 located between the large-diameter portion 6b of the meson 6 and the end face of the holder 8 becomes the dimension A as shown in FIG. When the end surface portion 8b of the holder 8 comes into contact, and in this embodiment, the axial thickness of the damper 7 is reduced by the B dimension between the step portion 6e and the end surface portion 8b of the metal sleeve 8a from the state shown in FIG. The step portion 6e and the end surface portion 8b of the holder 8 come into contact with each other.
[0019]
In the above-described embodiment, the step portion 6e and the end surface portion 8b of the holder 8 have a shape with an inclined surface. However, when the shape has no inclined surface, the step portion 6e is in an initial state. It is provided at a position located on the striker 10 side from the large diameter portion 6b by a dimension smaller than the axial thickness of a certain damper 7.
[0020]
【The invention's effect】
According to the present invention, a step portion having a larger outer diameter than the inner diameter of the drill is provided between the small diameter portion and the large diameter portion of the meson, and when the axial dimension of the cushioning material is equal to or less than the set dimension, By making the stepped part abut on the holder end face and the retreat position of the mesonor is regulated by this contact, even if the thickness of the cushioning material is reduced due to deformation, deterioration, etc. of the cushioning material, the increase in impact energy is suppressed, An impact tool that can extend the life of the main body can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an embodiment of an impact tool of the present invention.
2 is an enlarged cross-sectional view of the main part of FIG. 1, showing one operating state of the impact tool of the present invention.
3 is an enlarged cross-sectional view of the main part of FIG. 1, showing one operating state of the impact tool of the present invention.
[Explanation of symbols]
1 is a tool body, 2 is a tip tool, 3 is a front cover, 6 is a meson, 6a is a small diameter portion, 6b is a large diameter portion, 6e is a stepped portion, 7 is a damper, 8 is a holder, 8a is a metal sleeve, and 8b is An end surface portion, 9 is a cylinder, 10 is a striker, and 11 is a piston.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001076251A JP4016603B2 (en) | 2001-03-16 | 2001-03-16 | Impact tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001076251A JP4016603B2 (en) | 2001-03-16 | 2001-03-16 | Impact tool |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2002273672A JP2002273672A (en) | 2002-09-25 |
| JP2002273672A5 JP2002273672A5 (en) | 2005-06-16 |
| JP4016603B2 true JP4016603B2 (en) | 2007-12-05 |
Family
ID=18933223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001076251A Expired - Fee Related JP4016603B2 (en) | 2001-03-16 | 2001-03-16 | Impact tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4016603B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU218028U1 (en) * | 2022-11-18 | 2023-05-03 | Общество с ограниченной ответственностью "Газпромнефть - Битумные материалы" (ООО "Газпромнефть-БМ") | Automated module for applying bitumen-containing materials to the longitudinal joints of asphalt concrete pavement strips |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014008559A (en) | 2012-06-28 | 2014-01-20 | Hitachi Koki Co Ltd | Impact tool |
-
2001
- 2001-03-16 JP JP2001076251A patent/JP4016603B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU218028U1 (en) * | 2022-11-18 | 2023-05-03 | Общество с ограниченной ответственностью "Газпромнефть - Битумные материалы" (ООО "Газпромнефть-БМ") | Automated module for applying bitumen-containing materials to the longitudinal joints of asphalt concrete pavement strips |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002273672A (en) | 2002-09-25 |
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