JPH08141939A - Idle stroke preventive device of striking tool - Google Patents
Idle stroke preventive device of striking toolInfo
- Publication number
- JPH08141939A JPH08141939A JP27941094A JP27941094A JPH08141939A JP H08141939 A JPH08141939 A JP H08141939A JP 27941094 A JP27941094 A JP 27941094A JP 27941094 A JP27941094 A JP 27941094A JP H08141939 A JPH08141939 A JP H08141939A
- Authority
- JP
- Japan
- Prior art keywords
- catcher
- diameter portion
- bit
- slit
- shape
- 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.)
- Granted
Links
Landscapes
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電動ハンマー、ハンマー
ドリル等の打撃工具に係り、詳しくは、ビットの先端を
地面等に接触しない状態で工具を作動させた場合、往復
動する打撃子をキャッチャーが把持してビットを打撃し
ないようにした空打ち防止装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact tool such as an electric hammer and a hammer drill, and more particularly, to a catcher that reciprocates when the tool is operated without the tip of the bit touching the ground or the like. The present invention relates to an idle-strength prevention device that holds the bit so as not to hit the bit.
【０００２】[0002]
【従来の技術】従来空打ち防止装置としては、実開昭５
７−１１８１８５号公報に開示の考案が知られている。
これは図５（Ａ）に示す如く、往復動する打撃子の頭部
を把持するキャッチャー３０を先細りの漏斗状とすると
共に、その側面に長手方向のスリット３１を形成し、更
にキャッチャー３０と本体ハウジング３３との間に、同
じく長手方向にスリット３４を形成した合成樹脂製の衝
撃吸収材３２を嵌入したもので、打撃子の嵌入時にキャ
ッチャー３０へ加わる衝撃を、自身の弾性で吸収すると
共に、外周の衝撃吸収材３２によっても緩衝させて、キ
ャッチャー等構成部品の長寿命化を意図したものであ
る。2. Description of the Related Art As a conventional blank hitting prevention device, a full-scale shokai 5 is used.
A device disclosed in Japanese Patent Publication No. 7-118185 is known.
As shown in FIG. 5 (A), the catcher 30 that holds the head of the reciprocating striker has a tapered funnel shape, and a longitudinal slit 31 is formed on the side surface of the catcher 30. A shock absorber 32 made of synthetic resin in which a slit 34 is similarly formed in the longitudinal direction is fitted between the housing 33 and the housing 33. The shock applied to the catcher 30 at the time of fitting the striker is absorbed by its own elasticity, and The shock absorbing material 32 on the outer circumference is also used for buffering, so that the life of components such as the catcher is extended.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記空打ち防止
装置においては、キャッチャー３０を均等な肉厚で形成
しているため、打撃子嵌入時、半径方向へ拡大したキャ
ッチャー３０の内周形状は真円にならない。即ち図５
（Ｂ）の如く、打撃子３５が嵌入する際の最も衝撃の大
きい時に拡大変形（同図のように隙間Ｓが上下に生じた
りする）を起こすものであるから、打撃子３５が嵌入し
てから停止するまでの間、キャッチャー３０がスリット
３１付近の分断端部３０ｂやその点対称となる反対側３
０ａに最も強く接触し、キャッチャー３０の内周が部分
的に摩耗することになる。特に上記形状では応力がスリ
ットの前記反対側３０ａに集中するから、そのような摩
耗部分が生じると当該部分の強度も低下し、結局キャッ
チャー３０の寿命が短くなるのは勿論、空打ちを防止す
るための把持力も大きく低下することになってしまう。However, since the catcher 30 is formed to have a uniform wall thickness in the above-mentioned blank hitting prevention device, the inner peripheral shape of the catcher 30 which is expanded in the radial direction when the impactor is fitted is true. It doesn't become a circle. That is, FIG.
As shown in (B), when the impact element 35 is fitted, the impact element 35 is expanded and deformed (the gap S is vertically generated as shown in the figure). From the end to the stop, the catcher 30 has the divided end 30b near the slit 31 and the opposite side 3 which is symmetrical about the point.
0a is most strongly contacted, and the inner circumference of the catcher 30 is partially worn. In particular, in the above-mentioned shape, stress concentrates on the opposite side 30a of the slit. Therefore, when such a worn portion is generated, the strength of the portion is also reduced, and eventually the life of the catcher 30 is shortened, and in addition, idle driving is prevented. Therefore, the gripping force is also greatly reduced.
【０００４】[0004]
【課題を解決するための手段】そこで本発明は、上記ス
リット等の割り溝を有したキャッチャーにおいても、打
撃子の把持が確実に行えるのは勿論、キャッチャー自身
の耐久性を維持させて空打ち防止機能の低下を抑えるこ
とができる空打ち防止装置を提供するもので、その構成
は、キャッチャーの肉厚を、割り溝による分断部分から
遠ざかるに従って徐々に厚く形成したことを特徴とする
ものである。又前記キャッチャーの内周面を、打撃子側
から形成される軸方向に均一な同径部と、該同径部の適
宜位置からビット側へ向けて小径となるテーパ径部とか
ら構成するのが望ましい。尚本発明でいう円筒状とは、
文字通り内外周形状を円形とした円筒に限らず、円形に
近い多角形を内外周形状としたものも含み、又円柱や前
記漏斗状のテーパ柱形状も包含するものである。Therefore, according to the present invention, even in a catcher having a split groove such as the above-mentioned slit, the hitting element can be surely gripped, and the durability of the catcher itself can be maintained and idle hitting. The present invention provides an idle driving prevention device capable of suppressing a decrease in prevention function, and its construction is characterized in that the thickness of the catcher is gradually increased as it goes away from the part divided by the split groove. . Further, the inner peripheral surface of the catcher is composed of an axially uniform portion formed from the side of the striker, and a taper portion having a smaller diameter from an appropriate position of the same diameter portion toward the bit side. Is desirable. The cylindrical shape in the present invention means
The shape is not limited to a cylinder whose inner and outer peripheral shapes are literally circular, but also includes polygonal shapes close to a circle which are inner and outer peripheral shapes, and also includes a columnar shape and a funnel-shaped tapered columnar shape.
【０００５】[0005]
【作用】空打ち時に前方へ飛び出した打撃子がキャッチ
ャーに嵌入する際、キャッチャーは自身の弾性によって
拡大しながらその衝撃を吸収するが、キャッチャーの肉
圧が、割り溝部分が最も薄く、遠ざかるに従って徐々に
厚くなり、反対側が最も厚い形状となっているから、キ
ャッチャーは真円を保ちながら拡大し、その内面は打撃
子へ均等に接触する。よって高い把持力が得られて部分
的な摩耗等も生じない。又応力が集中する反対側の肉厚
が最も厚いから、弾性の低下が起こりにくく、耐久性も
好適となる。更にキャッチャーの内周面を前記同径部と
テーパ径部との複合形状とすると、打撃子が嵌入する
際、同径部との接触により最初から大きな力で把持さ
れ、続いて先細りのテーパ径部との接触により更に増加
する力で把持されることになる。よって一層高いキャッ
チャーの把持力が得られる。[Operation] When the hitting element that has jumped out forward during idle driving is inserted into the catcher, the catcher absorbs the impact while expanding due to its elasticity, but the meat pressure of the catcher is the thinnest in the split groove part, and as it goes away Since it gradually becomes thicker and the opposite side has the thickest shape, the catcher expands while maintaining a perfect circle, and its inner surface evenly contacts the striker. Therefore, a high gripping force is obtained, and partial wear or the like does not occur. In addition, since the thickness on the opposite side where the stress is concentrated is thickest, the elasticity is less likely to decrease and the durability is also suitable. Further, if the inner peripheral surface of the catcher has a composite shape of the same diameter portion and the taper diameter portion, when the hitting element is fitted, it is grasped with a large force from the beginning due to the contact with the same diameter portion, and then the tapered taper diameter. It will be gripped by the force that further increases due to the contact with the part. Therefore, a higher gripping force of the catcher can be obtained.
【０００６】[0006]
【実施例】以下本発明の実施例を図面に基いて説明す
る。図１は電動ハンマー１の一部縦断面図で、筒状のピ
ストンハウジング２内にあって、図示しないクランク機
構によって往復動する連結ロッド３の先端には、ピン４
を介してピストン５が連結されている。このピストン５
は、ピストンハウジング２内を摺動可能な打撃子６の内
筒部６ａ内後方に位置すると共に、外周に環装されるＹ
リング７によって内筒部６ａをシールし、その前方に空
気室８を形成している。又ピストンハウジング２の先端
にはビットホルダー９がボルト１０によって螺着され、
その中央には、ビット１１の装着孔９ａが形成されると
共に、装着孔９ａの上方先端付近には、ビット１１の抜
け止めとしてのリテーナ１２が、ビットホルダー９の軸
方向と直交し、その下部を装着孔９ａ内へやや突出させ
た状態で挿着されている。更に１３はビットホルダー９
に披着されるダストカバーである。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial vertical cross-sectional view of the electric hammer 1, which is located in a cylindrical piston housing 2 and has a pin 4 at the tip of a connecting rod 3 which reciprocates by a crank mechanism (not shown).
The piston 5 is connected via. This piston 5
Is located inside the inner cylindrical portion 6a of the striker 6 slidable in the piston housing 2 and is attached to the outer periphery of the Y.
The ring 7 seals the inner tubular portion 6a, and an air chamber 8 is formed in front of the inner tubular portion 6a. Further, a bit holder 9 is screwed onto the tip of the piston housing 2 with a bolt 10,
A mounting hole 9a for the bit 11 is formed in the center thereof, and a retainer 12 for preventing the bit 11 from coming off is formed in the vicinity of the upper tip of the mounting hole 9a at a position orthogonal to the axial direction of the bit holder 9 Is slightly inserted into the mounting hole 9a. 13 is a bit holder 9
It is a dust cover that will be put on the market.
【０００７】そしてピストンハウジング２におけるビッ
トホルダー９と打撃子６との間には、前方（図１の右
側）からウレタンリング１４と、Ｏリング１５，１６を
備えたシールホルダ１７とが順に配置され、シールホル
ダ１７の後方には、外周にラバーリング１８を装着した
円筒体であるキャッチャー１９が配置されている。この
キャッチャー１９の内周面は、同図１の断面で示される
通り、打撃子６側の内周面を軸方向へ均一にした同径部
２０と、その同径部２０からシールホルダ１７側へ行く
に従って小径となるテーパ径部２１との複合形状となっ
ており、更に図２の拡大断面に示す如くキャッチャー１
９は、その側面長手方向に分断部分としてのスリット２
２が形成されると共に、その横断面形状が、円形の内径
部ｄ1 の中心を外径部ｄの中心と偏心させ、スリット２
２側の肉厚ｔ1 を最も薄くして周方向へ遠ざかるに従っ
て徐々に厚くし、スリット２２から最も遠くなる反対側
の肉厚ｔ2 を最も厚くしたＣ形リング状となっている。
これはキャッチャー１９の前方側（テーパ径部２１側）
の端部も同様で、偏心した内径部ｄ2 はその中心を内径
部ｄ1 と一致しているが、テーパで狭くなる分だけ内径
部ｄ1 より小さい寸法となる。又この状態での内径部ｄ
1 と打撃子６のテーパ状の先端部６ｂとはややきつめの
嵌め合いとなっている。更にキャッチャー１９は、シー
ルホルダ１７に挿着されるビット１１と打撃子６との軸
心に、キャッチャー１９の内径部ｄ1 と内径部ｄ2 との
中心が一致するように配置されている。尚本実施例では
このときのスリット２２の幅は約０．３mmで、肉厚ｔ1
が２．０mm、ｔ2 が４．０mmで、ラバーリング１８とピ
ストンハウジング２との間には、打撃子６嵌入時の拡大
を考慮して若干の隙間が設けられている。又２３はワッ
シャー、２４はウレタンリングで、キャッチャー１９の
軸方向の位置決めと共に、嵌入した打撃子６が離脱する
際のキャッチャー１９の抑えとなるものである。Between the bit holder 9 and the striker 6 in the piston housing 2, a urethane ring 14 and a seal holder 17 having O-rings 15 and 16 are sequentially arranged from the front (right side in FIG. 1). At the rear of the seal holder 17, a catcher 19 which is a cylindrical body with a rubber ring 18 mounted on the outer periphery is arranged. As shown in the cross section of FIG. 1, the inner peripheral surface of the catcher 19 has the same diameter portion 20 in which the inner peripheral surface on the side of the striker 6 is made uniform in the axial direction, and from the same diameter portion 20 to the seal holder 17 side. It has a complex shape with the tapered diameter portion 21 that becomes smaller in diameter as it goes to the catcher 1 as shown in the enlarged cross section of FIG.
9 is a slit 2 as a divided portion in the longitudinal direction of the side surface.
2 is formed, and its cross-sectional shape causes the center of the circular inner diameter portion d 1 to be eccentric with the center of the outer diameter portion d, so that the slit 2
The wall thickness t 1 on the second side is thinnest and gradually increases as it goes away in the circumferential direction, and the wall thickness t 2 on the opposite side farthest from the slit 22 is thickest to form a C-shaped ring.
This is the front side of the catcher 19 (taper diameter portion 21 side)
Similarly, the center of the eccentric inner diameter portion d 2 coincides with the inner diameter portion d 1 , but the eccentric inner diameter portion d 2 is smaller than the inner diameter portion d 1 due to the taper. Also, the inner diameter d in this state
1 and the tapered tip portion 6b of the striker 6 are fitted with each other with a slightly tight fit. Further, the catcher 19 is arranged such that the centers of the inner diameter portion d 1 and the inner diameter portion d 2 of the catcher 19 are aligned with the axial center of the bit 11 inserted into the seal holder 17 and the striker 6. In this embodiment, the width of the slit 22 at this time is about 0.3 mm and the thickness t 1
Is 2.0 mm and t 2 is 4.0 mm, and a slight gap is provided between the rubber ring 18 and the piston housing 2 in consideration of expansion when the striker 6 is fitted. Further, numeral 23 is a washer, and numeral 24 is an urethane ring, which serves to position the catcher 19 in the axial direction and to restrain the catcher 19 when the inserted striker 6 is removed.
【０００８】以上の如く構成された電動ハンマー１は、
ビット１１をビットホルダー９の挿着孔９ａから差し込
むと、装着孔９ａ内へ突出したリテーナ１２がビット１
１の上部軸方向へ形成された切除部１１ａ内前方へ位置
し、ビット１１が抜け止め装着される（図１）。そして
通常のハツリや土掘り作業においては、ピストン５の往
復動によって空気室８を介して打撃子６が往復動し、キ
ャッチャー１９のやや後方へ突出したビット１１の後端
を打撃する。そしてビット１１の先端が地面等に当接し
ない状態でピストン５を作動させると、前進した打撃子
６は最初の空打ちでビット１１の後端を打撃し、ビット
１１を、図４の如く、その切除部１１ａの後端がリテー
ナ１２へ衝突する位置まで突出させて停止させる。一方
打撃子６は軸心の一致した内径部ｄ1 から進入してその
ままキャッチャー１９へ嵌入するが、キャッチャー１９
は、図３のようにスリット２２によって内径部ｄ1 ，ｄ
2 が拡大して内径部ｄ1 ´，ｄ2 ´となり、それにより
生じる自身の弾力と、同時に拡大する外周のラバーリン
グ１８の弾力と合わせて徐々に把持力を強め、打撃子６
の先端部６ｂがテーパ径部２１まで進入した図４の位置
で最も把持力を高めて打撃子６を停止させる。このとき
キャッチャー１９は、スリット２２側の肉厚ｔ1 より反
対側の肉厚ｔ2 を厚くした形状となっているから、拡が
る際の曲げ応力が最も強度の高い部分ｔ2 に集中すると
共に、拡大した内径部ｄ1 ´，ｄ2 ´も略真円を維持し
ているから（図３）、打撃子６をキャッチャー１９の内
周面全体が均等に把持できることとなり、キャッチャー
１９の部分的な摩耗や弾力性の低下が生じなくなる。又
本実施例では、キャッチャー１９の内周面が前述の如く
同径部２０、テーパ径部２１の複合形状となっているか
ら、打撃子６の先端部６ｂには、まず同径部２０へ進入
する際の摩擦によって最初から大きな把持力が与えら
れ、その後はテーパ径部２１への進入に従って更にその
力が増加する傾向となり、同径部２０のみ、テーパ径部
２１のみを内周形状としたものに比べてより高い把持力
が得られる。更に打撃子６がキャッチャー１９に把持さ
れる際には、その衝撃がウレタンリング１４、シールホ
ルダ１７によって緩和されるが、ここでは打撃子６の嵌
入時に、シールホルダ１７と打撃子６との間の空気もク
ッションとして作用する。特に真円を保ちながら拡大す
るキャッチャー１９によって空気の漏れは極力抑えら
れ、又外装されるラバーリング１８もスリット等の分断
部分のないリング体であるから、このエアクッション効
果は高く、キャッチャー１９への衝撃を一層和らげるこ
とができる。The electric hammer 1 constructed as described above is
When the bit 11 is inserted through the insertion hole 9a of the bit holder 9, the retainer 12 protruding into the mounting hole 9a causes the bit 1
The bit 11 is positioned forward of the inside of the cut-off portion 11a formed in the axial direction of the upper part of the No. 1 and is attached (FIG. 1) so as not to come off. In ordinary chipping and digging work, the striking element 6 reciprocates through the air chamber 8 due to the reciprocating movement of the piston 5, and strikes the rear end of the bit 11 protruding slightly rearward of the catcher 19. When the piston 5 is operated in a state where the tip of the bit 11 does not contact the ground or the like, the striking element 6 that has moved forward strikes the rear end of the bit 11 with the first blank shot, so that the bit 11 is moved as shown in FIG. The cutout portion 11a is made to project to a position where the rear end thereof collides with the retainer 12 and stopped. On the other hand, the striker 6 enters from the inner diameter portion d 1 with the same axial center and fits into the catcher 19 as it is.
It has an inner diameter portion d 1 by the slits 22 as shown in FIG. 3, d
2 expands to become inner diameter parts d 1 ′ and d 2 ′, and the elastic force generated thereby and the elastic force of the rubber ring 18 on the outer periphery which expands at the same time gradually increase the gripping force, and the impactor 6
At the position of FIG. 4 where the tip portion 6b of the above has entered the taper diameter portion 21, the gripping force is maximized and the striker 6 is stopped. At this time, since the catcher 19 has a shape in which the thickness t 2 on the opposite side is thicker than the thickness t 1 on the slit 22 side, the bending stress at the time of spreading is concentrated on the portion t 2 having the highest strength, and Since the enlarged inner diameter portions d 1 ′ and d 2 ′ also maintain a substantially perfect circle (FIG. 3), the entire inner peripheral surface of the catcher 19 can be evenly gripped by the striker 6, and the catcher 19 is partially retained. No wear or loss of elasticity occurs. Further, in this embodiment, since the inner peripheral surface of the catcher 19 has a composite shape of the same diameter portion 20 and the tapered diameter portion 21 as described above, the tip portion 6b of the striker 6 is first moved to the same diameter portion 20. A large gripping force is applied from the beginning due to friction when entering, and thereafter the force tends to further increase as the taper diameter portion 21 enters, and only the same diameter portion 20 and the taper diameter portion 21 have the inner peripheral shape. A higher gripping force can be obtained as compared with the above. Further, when the hitting element 6 is gripped by the catcher 19, the impact is mitigated by the urethane ring 14 and the seal holder 17. However, here, when the hitting element 6 is fitted, the impact between the seal holder 17 and the hitting element 6 is reduced. The air also acts as a cushion. In particular, the catcher 19 that expands while maintaining a perfect circle prevents air leakage as much as possible, and since the exterior rubber ring 18 is also a ring body without slits or other dividing parts, this air cushioning effect is high, The shock of can be softened further.
【０００９】そしてここから通常作業を行う場合は、図
４の状態からビット１１の先端を地面等へ当接させてビ
ットホルダー９側へ押し込めば良い。するとビット１１
は図１の位置へ後退し、後端がシールホルダ１７から突
出して打撃子６をキャッチャー１９から離脱させるか
ら、再びハンマーとして使用できる。When performing normal work from here, the tip of the bit 11 may be brought into contact with the ground or the like from the state of FIG. 4 and pushed into the bit holder 9 side. Then bit 11
1 retracts to the position shown in FIG. 1 and the rear end projects from the seal holder 17 to disengage the striker 6 from the catcher 19, so that it can be used again as a hammer.
【００１０】尚内径部ｄ1 ，ｄ2 は上記実施例のように
円形とするのが最も好ましいが、真円に近い多角形を採
用しても、嵌入する打撃子へ均等に接触する効果は得ら
れる。又スリット２２の幅や肉厚ｔ1 ，ｔ2 の寸法も上
記実施例に限定するものでなく、打撃工具の種類や規格
等に応じて適宜変更できる。更にキャッチャー１９自身
の形状も円筒に止まらず、角筒やテーパ筒等でも差し支
えなく、その内周形状も、上記同径部とテーパ径部との
複合形状に限らず、同径部のみ、テーパ径部のみ等で形
成しても、上記キャッチャー１９の肉厚差による把持力
で充分空打ち防止は行える。勿論本発明は、上記実施例
の様に打撃子が直接ビットを打撃するタイプ以外にも、
往復動する打撃子とビットとの間に、中間体（中間打撃
子）を介在させて打撃動作を伝達するタイプでも適用可
能である。It is most preferable that the inner diameter portions d 1 and d 2 are circular as in the above embodiment, but even if a polygonal shape close to a perfect circle is adopted, the effect of evenly contacting the striker to be fitted is not obtained. can get. Further, the width of the slit 22 and the dimensions of the wall thicknesses t 1 and t 2 are not limited to those in the above-described embodiment, and can be appropriately changed according to the type and standard of the impact tool. Further, the shape of the catcher 19 itself is not limited to a cylinder, and may be a square tube or a tapered tube, and the inner peripheral shape thereof is not limited to the composite shape of the same diameter portion and the taper diameter portion, and only the same diameter portion is tapered. Even if the catcher 19 is formed only by the diameter part, the idle force can be sufficiently prevented by the gripping force due to the difference in the wall thickness of the catcher 19. Of course, the present invention is not limited to the type in which the striker directly strikes the bit as in the above embodiment,
It is also applicable to a type in which an intermediate body (intermediate striker) is interposed between the reciprocating striker and the bit to transmit the strike motion.
【００１１】[0011]
【発明の効果】以上本発明によれば、打撃子はキャッチ
ャーに均等且つ高い把持力で保持されて空打ちを確実に
防止できると共に、キャッチャー自身の部分的な摩耗や
弾性の低下を抑えて耐久性を向上させることが可能とな
る。又真円を保ちながら拡大するキャッチャーにより打
撃子嵌入時の空気漏れが少なく、エアクッション効果も
期待できる。更にキャッチャーの内周面を同径部とテー
パ径部との複合形状とすると、キャッチャーの把持力が
一層増加する。As described above, according to the present invention, the striker is held evenly and with a high gripping force in the catcher to reliably prevent idling, and at the same time, the catcher itself is prevented from being partially worn or reduced in elasticity and is durable. It is possible to improve the property. In addition, the catcher that expands while maintaining a perfect circle reduces air leakage when the striker is inserted, and an air cushion effect can be expected. Further, when the inner peripheral surface of the catcher has a composite shape of the same diameter portion and the tapered diameter portion, the gripping force of the catcher is further increased.
【図１】電動ハンマーの一部縦断面図である。FIG. 1 is a partial vertical sectional view of an electric hammer.
【図２】Ａ−Ａ線における拡大断面説明図である。FIG. 2 is an enlarged cross-sectional explanatory view taken along the line AA.
【図３】キャッチャーに打撃子が嵌入した状態を示す拡
大断面説明図である。FIG. 3 is an enlarged cross-sectional explanatory view showing a state in which a striker is fitted in a catcher.
【図４】空打ち防止がなされた状態の電動ハンマーの一
部縦断面図である。FIG. 4 is a partial vertical cross-sectional view of the electric hammer in a state in which idle driving is prevented.
【図５】（Ａ）従来の空打ち防止装置の説明図である。 （Ｂ）従来の空打ち防止装置の説明図である。FIG. 5A is an explanatory diagram of a conventional blanking prevention device. (B) It is explanatory drawing of the conventional blanking prevention device.
１・・電動ハンマー、２・・ピストンハウジング、３・
・連結ロッド、４・・ピン、５・・ピストン、６・・打
撃子、７・・Ｙリング、８・・空気室、９・・ビットホ
ルダー、１０・・ボルト、１１・・ビット、１２・・リ
テーナ、１３・・ダストカバー、１４・・ウレタンリン
グ、１５，１６・・Ｏリング、１７・・シールホルダ、
１８・・ラバーリング、１９・・キャッチャー、２０・
・同径部、２１・・テーパ径部、２２・・スリット、２
３・・ワッシャー、２４・・ウレタンリング。1 ... electric hammer, 2 piston housing, 3
・ Connecting rod, 4 ・ ・ Pin, 5 ・ ・ Piston, 6 ・ ・ Strike element, 7 ・ ・ Y ring, 8 ・ ・ Air chamber, 9 ・ ・ Bit holder, 10 ・ ・ Bolt, 11 ・ ・ Bit, 12 ・・ Retainer, 13 ・ ・ Dust cover, 14 ・ ・ Urethane ring, 15, 16 ・ ・ O ring, 17 ・ ・ Seal holder,
18 ・ ・ Rubber ring 、 19 ・ ・ Catcher 、 20 ・
・ Same diameter part, 21 ・ ・ Taper diameter part, 22 ・ ・ Slit, 2
3 ... Washer, 24 ... Urethane ring.
Claims (2)
へ装着されたビットに打撃動作を与える打撃子と、該打
撃子の前方にあって前記ビットの空打ち時に打撃子を把
持可能な円筒状のキャッチャーとを備え、該キャッチャ
ーを１箇所の割り溝で分断して弾力性を付与した打撃工
具の空打ち防止装置であって、前記キャッチャーの肉厚
を、前記分断部分から遠ざかるに従って徐々に厚く形成
したことを特徴とする打撃工具の空打ち防止装置。1. A striking element that reciprocates in a main body housing to give a striking motion to a bit mounted on the tip of a tool, and a cylinder that is in front of the striking element and can grip the striking element when the bit is idled. Is a hitting prevention device for a striking tool, which is provided with elasticity by dividing the catcher with one split groove, and gradually increases the thickness of the catcher as the distance from the cut portion increases. A blanking prevention device for a striking tool characterized by being formed thick.
から形成される軸方向に均一な同径部と、該同径部の適
宜位置からビット側へ向けて小径となるテーパ径部とか
らなる請求項１に記載の打撃工具の空打ち防止装置。2. The inner peripheral surface of the catcher has an axially uniform diameter portion formed from the striker side, and a taper diameter portion having a smaller diameter from an appropriate position of the diameter portion toward the bit side. A blank hitting prevention device for a striking tool according to claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27941094A JP3556714B2 (en) | 1994-11-14 | 1994-11-14 | Immersion prevention device for impact tools |
| TW83110611A TW252068B (en) | 1994-11-14 | 1994-11-14 | Empty-striking-prevention device for striking tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27941094A JP3556714B2 (en) | 1994-11-14 | 1994-11-14 | Immersion prevention device for impact tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08141939A true JPH08141939A (en) | 1996-06-04 |
| JP3556714B2 JP3556714B2 (en) | 2004-08-25 |
Family
ID=17610714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27941094A Expired - Lifetime JP3556714B2 (en) | 1994-11-14 | 1994-11-14 | Immersion prevention device for impact tools |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3556714B2 (en) |
| TW (1) | TW252068B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005219203A (en) * | 2004-02-02 | 2005-08-18 | Sandvik Tamrock Oy | Hydraulic hammer |
| WO2009035090A1 (en) * | 2007-09-13 | 2009-03-19 | Makita Corporation | Impact tool |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207972B (en) | 2006-12-22 | 2010-05-19 | 鸿富锦精密工业（深圳）有限公司 | Circuit board and photosensitive device using the same |
-
1994
- 1994-11-14 JP JP27941094A patent/JP3556714B2/en not_active Expired - Lifetime
- 1994-11-14 TW TW83110611A patent/TW252068B/en active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005219203A (en) * | 2004-02-02 | 2005-08-18 | Sandvik Tamrock Oy | Hydraulic hammer |
| WO2009035090A1 (en) * | 2007-09-13 | 2009-03-19 | Makita Corporation | Impact tool |
| JP2009066710A (en) * | 2007-09-13 | 2009-04-02 | Makita Corp | Hammering tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3556714B2 (en) | 2004-08-25 |
| TW252068B (en) | 1995-07-21 |
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