JPH0433587B2 - - Google Patents
Info
- Publication number
- JPH0433587B2 JPH0433587B2 JP11943486A JP11943486A JPH0433587B2 JP H0433587 B2 JPH0433587 B2 JP H0433587B2 JP 11943486 A JP11943486 A JP 11943486A JP 11943486 A JP11943486 A JP 11943486A JP H0433587 B2 JPH0433587 B2 JP H0433587B2
- Authority
- JP
- Japan
- Prior art keywords
- gripping member
- striking
- tool
- gripping
- striker
- 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.)
- Expired
Links
Landscapes
- Percussive Tools And Related Accessories (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、空気圧を利用した電気ハンマ等の空
転時における打撃子の連続打撃運動（以下空打と
呼ぶ）の防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device that uses air pressure to prevent continuous striking motion of a striking element (hereinafter referred to as "dry striking") when an electric hammer or the like is idling.
空打ちを防止するために、従来から、打撃子が
前進して来た時、前方に設けた把持部材のテーパ
に嵌合し、その把持力によつて、打撃子を固定す
る、という方法がとられている。把持部材は、通
常、内径部がテーパ状で１箇所を切断したＣ字形
円筒状のバネである。打撃子が、把持部材中に進
入すると、打撃子が把持部材のテーパをおし拡
げ、バネの把持力によつて、運動を停止する。打
撃子が進入するときの摩擦により、接触部の摩耗
が起り、把持力が低下し易く、把持部材の寿命が
短いのが、この装置の欠点である。空打ちが起る
と、打撃子の打撃によつて発生する大きな力を、
フロントカバで受けるため、機体が破損し易い。
In order to prevent dry firing, there has been a conventional method in which when the striker moves forward, it fits into the taper of a gripping member provided in front, and the striker is fixed by its gripping force. It is taken. The gripping member is usually a C-shaped cylindrical spring with a tapered inner diameter and cut at one point. When the striker enters the gripping member, the striker expands the taper of the gripping member and stops its movement due to the gripping force of the spring. Disadvantages of this device include the fact that friction when the striking element enters causes wear of the contact portion, which tends to reduce the gripping force and shortens the life of the gripping member. When a dry strike occurs, the large force generated by the striker's strike is
The aircraft is easily damaged because it is caught by the front cover.
本発明の目的は、上記した従来技術の欠点をな
くし、空打防止装置の寿命を増すことにより、機
体の損傷を防ぐことにある。
An object of the present invention is to prevent damage to the airframe by eliminating the above-mentioned drawbacks of the prior art and increasing the life of the dry firing prevention device.
本発明は、把持部材が打撃子を把持固定するた
めには、把持力を一定値以上に大きくする方法と
打撃子が、把持部材に進入する時の摩擦及び、把
持部材を拡大するに消費するエネルギを大きくす
る方法があることに着目し、把持力は小さくおさ
え、消費エネルギを大きくするため、把持部材た
るバネを、予め付勢しておき、打撃子が把持部材
に進入するときの把持力が、零から始まるのでは
なく、進入開始時にある値をとるように、把持部
材の支持方法を工夫したものである。
The present invention provides a method of increasing the gripping force to a certain value or more in order for the gripping member to grip and fix the striking member, and the impactor consumes friction when entering the gripping member and enlarging the gripping member. Focusing on the fact that there is a way to increase the energy, in order to keep the gripping force small and increase the energy consumption, the spring that is the gripping member is biased in advance, and the gripping force when the striker enters the gripping member is However, the method of supporting the gripping member is devised so that it does not start from zero but takes a certain value at the start of the approach.
第１図は、本発明になる電気ハンマの空打防止
装置部分の一実施例を示す縦断側面図である。第
２図は、同じく工具が前進し、空打防止装置が働
いた状態を示す縦断側面図である。第３図は、把
持部材の正面図、第４図は、把持部材の側断面
図、第５図は、予圧手段たるマウスワツシヤに把
持部材を装着付勢したものを示す正面図、第６図
は、同じく側断面図である。
FIG. 1 is a longitudinal sectional side view showing an embodiment of the dry striking prevention device portion of the electric hammer according to the present invention. FIG. 2 is a longitudinal sectional side view showing a state in which the tool is similarly advanced and the dry striking prevention device is activated. FIG. 3 is a front view of the gripping member, FIG. 4 is a side sectional view of the gripping member, FIG. 5 is a front view showing the gripping member attached to a mouth washer serving as preloading means, and FIG. 6 is a front view of the gripping member. , which is also a side sectional view.
図において、ピストン８は打撃子７の内部を往
復運動し、打撃子７の内部の空気を圧縮、吸引し
て、打撃子７が工具１を打撃する運動を生ぜしめ
る。シリンダケース６は、打撃子７の案内を行う
とともに、内径部にテーパを形成した把持部材
４、マウスワツシヤ５、フロントカバ３を保持す
る。工具を被削材より離すと、打撃子７により打
撃された工具１は、第２図に示すように前進し、
リテーナ２に突当つて止る。打撃子７もこれに追
随して前方に飛び出し、把持部材４の内径を押し
拡げながら進入し停止する。把持部材４は、マウ
スワツシヤ凸起部に予圧を与えて嵌合されてお
り、打撃子７が進入して来たとき、接触開始直後
に、予め付勢されてある分の把持力で、打撃子を
把持する。打撃子の進入とともに、把持力は増
し、また、打撃子の運動エネルギを吸収する。把
持部材を付勢していない場合の打撃子の進入量Ｘ
と把持部材の把持力Ｆを関係を表わしたグラフを
第７図に示す。把持部材を付勢した場合の把持力
と進入量の関係を第８図に示す。図において、把
持部材の吸収するエネルギは、三角形Ａ、Ｂ、Ｃ
の面積、及び、四角形ABCDの面積で示され、
把持部材の最大把持力は、、′の長さで表
わされる。把持部材の吸収エネルギが等しいと
き、把持力の最大値は、付勢された把持部材を用
いた方が小さくとれる。従つて、把持部材と、打
撃子の接触面圧は低くおさえられ、摩耗が少く、
寿命の長い空打防止装置が得られる。また、作業
においては、工具を被削材に押し付けることによ
り、打撃子を把持部材からはずしてやり、打撃状
態に戻す操作を繰返し行うが、この時の押付力
は、把持力に左右され、把持力が大きいと、押付
力も大きくなり、操作性が悪くなる。従つて、把
持力の最大値を低くできることで操作性も改善す
ることができる。 In the figure, the piston 8 reciprocates inside the striker 7, compresses and sucks the air inside the striker 7, and causes the striker 7 to strike the tool 1. The cylinder case 6 guides the striker 7 and holds the grip member 4 having a tapered inner diameter, the mouth washer 5, and the front cover 3. When the tool is released from the workpiece, the tool 1 struck by the striker 7 moves forward as shown in FIG.
It hits retainer 2 and stops. The striker 7 also follows this and jumps forward, enters the gripping member 4 while expanding its inner diameter, and stops. The gripping member 4 is fitted with a preload applied to the protruding portion of the mouth washer, and when the striker 7 enters, the gripping member 4 is applied with a pre-biased gripping force immediately after the start of contact. grasp. As the striker enters, the gripping force increases and also absorbs the kinetic energy of the striker. Ingress amount X of the impactor when the gripping member is not energized
A graph showing the relationship between F and the gripping force F of the gripping member is shown in FIG. FIG. 8 shows the relationship between the gripping force and the amount of penetration when the gripping member is biased. In the figure, the energy absorbed by the gripping member is represented by triangles A, B, and C.
It is shown by the area of , and the area of rectangle ABCD,
The maximum gripping force of the gripping member is expressed by the length . When the absorption energy of the gripping members is equal, the maximum value of the gripping force is smaller when the biased gripping member is used. Therefore, the contact pressure between the gripping member and the striking element is kept low, resulting in less wear and tear.
A dry firing prevention device with a long life can be obtained. In addition, during work, the tool is pressed against the workpiece, the striking member is removed from the gripping member, and the operation is repeated to return it to the striking state, but the pressing force at this time depends on the gripping force. If is large, the pressing force will also be large and the operability will be poor. Therefore, operability can also be improved by lowering the maximum value of the gripping force.
本発明の実施例では、把持部材の内径がテーパ
を持つているが、逆に、打撃子の方にテーパを付
けて同様の機能を持たせることができる。また、
テーパを把持部材、打撃子両者に付けても同様の
機能を持たせることができる。 In the embodiment of the present invention, the inner diameter of the gripping member is tapered, but conversely, the striking member may be tapered to provide a similar function. Also,
A similar function can be provided by adding a taper to both the gripping member and the striking element.
本発明によれば、把持部材を付勢して使用する
ことにより、把持力を低くおさえた空打防止装置
を構成できるため、摩耗が少く、長寿命の空打防
止装置を提供できる。また最大把持力を低くおさ
えられるため、実作業において、工具の操作性を
改善できる。
According to the present invention, by using the gripping member with bias, it is possible to configure a dry firing prevention device with a low gripping force, so that it is possible to provide a dry firing prevention device with less wear and a long life. Furthermore, since the maximum gripping force can be kept low, the operability of the tool can be improved in actual work.
第１図は、本発明になる、電気ハンマの空打防
止装置部分の一実施例を示す縦断側面図である。
第２図は、同じく工具が前進し、空打防止装置が
働いた状態を示す縦断側面図である。第３図は、
把持部材の正面図、第４図は、把持部材の縦断側
面図、第５図は、予圧手段たるマウスワツシヤに
把持部材を装着付勢したものを示す正面図、第６
図は、第５図の縦断側面図である。第７図は、把
持部材を付勢していない場合の打撃子の進入量Ｘ
と把持部材の把持力Ｆの関係を表わしたグラフで
ある。第８図は、把持部材を付勢した場合の把持
力と進入量の関係を示すグラフである。
FIG. 1 is a longitudinal sectional side view showing an embodiment of an electric hammer dry striking prevention device according to the present invention.
FIG. 2 is a longitudinal sectional side view showing a state in which the tool is similarly advanced and the dry striking prevention device is activated. Figure 3 shows
FIG. 4 is a front view of the gripping member, FIG. 4 is a longitudinal sectional side view of the gripping member, FIG.
The figure is a longitudinal sectional side view of FIG. 5. Figure 7 shows the amount of advance of the impactor X when the gripping member is not energized.
It is a graph showing the relationship between the gripping force F of the gripping member and the gripping force F of the gripping member. FIG. 8 is a graph showing the relationship between the gripping force and the amount of penetration when the gripping member is biased.
Claims (1)
撃子を駆動し、工具に打撃を与える方式の打撃工
具であつて、工具を被削材より離した時、打撃子
により打撃された工具が、制限的に軸方向に移動
可能で、これに追随して、打撃子が、工具方向に
移動し、該打撃子の外周部を嵌合把持する円筒状
把持部材を有するものにおいて、該把持部材を、
半径方向一ケ所に切込を付けたＣ字形状の弾性体
により成形すると共に、その内径部に、自由状態
より押し拡げる予圧手段を配設して、前記弾性体
が、常時、把持力を増加したまゝ装着可能に構成
したことを特徴とする空打防止装置。1. A striking tool that uses the reciprocating motion of a piston to drive a striking element through air to strike the tool, and when the tool is released from the workpiece, the tool struck by the striking element is , having a cylindrical gripping member that is limitedly movable in the axial direction, the striking member moves in the direction of the tool, and that fits and grips the outer circumference of the striking member, the gripping member of,
It is formed by a C-shaped elastic body with a notch in one place in the radial direction, and a preload means is provided on the inner diameter of the body to push it out from the free state, so that the elastic body constantly increases the gripping force. A dry hitting prevention device characterized by being configured such that it can be installed while standing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11943486A JPS62277278A (en) | 1986-05-23 | 1986-05-23 | Empty-striking preventive device for impact tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11943486A JPS62277278A (en) | 1986-05-23 | 1986-05-23 | Empty-striking preventive device for impact tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62277278A JPS62277278A (en) | 1987-12-02 |
| JPH0433587B2 true JPH0433587B2 (en) | 1992-06-03 |
Family
ID=14761330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11943486A Granted JPS62277278A (en) | 1986-05-23 | 1986-05-23 | Empty-striking preventive device for impact tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62277278A (en) |
-
1986
- 1986-05-23 JP JP11943486A patent/JPS62277278A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62277278A (en) | 1987-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |