JPS59124580A - Impact moving tool - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 この発明は油圧と空気や窒素ガス等のガスの圧縮により
生ずる圧力とによってピストン番こ進退運動を行なわせ
て、これによりチゼル等の工具を打撃するようにし、動
力源を油圧に求め、この油圧によるピストンの上昇運動
によりガスを圧縮してその復元力によりピストンを下降
させてガスの特性である作動の迅速性を利用してピスト
ンによる打撃力を増すことと、ガスの回路を閉回路とし
てガスの消費量は回路中からの僅かな漏洩のみとして従
来の空気動工具のような圧縮機を不用とした衝撃動工具
の改良に関するものである。Detailed Description of the Invention This invention uses hydraulic pressure and pressure generated by compression of gas such as air or nitrogen gas to cause a piston to advance and retreat, thereby striking a tool such as a chisel. is determined by hydraulic pressure, and the upward movement of the piston due to this hydraulic pressure compresses the gas, and its restoring force causes the piston to descend.The striking force of the piston is increased by utilizing the quickness of operation, which is a characteristic of gas. The present invention relates to an improvement of an impact power tool which eliminates the need for a compressor like a conventional air power tool by making the circuit a closed circuit so that only a small amount of gas leaks from the circuit.

このような公知の衝撃動工具は上記のような優れγこ特
徴を有するものであるが、ハンマの下降時（こ２いて、
シリンダ内の王室が排油口に通じるので下室の油圧が急
激に下降し、王室とこれに連通ずる油路の連通部附近で
キャビテーションが起り、騒音や振動が発生し、甚だし
い場合は、損傷を生しるなどの問題があった。Such known impact power tools have the above-mentioned excellent features, but when the hammer is lowered (
Since the royal chamber in the cylinder communicates with the oil drain port, the oil pressure in the lower chamber drops rapidly, causing cavitation near the connection between the royal chamber and the oil passage that communicates with it, causing noise and vibration, and in severe cases, causing damage. There were problems such as the generation of

この発明は上記のような公知の衝撃動工具の問題を解決
してピストンが下降行程番こ入つ１こ場合でも下室内の
油圧の急激な下降がないようにしたものである。The present invention solves the problems of the known impact power tools as described above, and prevents a sudden drop in the oil pressure in the lower chamber even when the piston enters its downward stroke.

すなわち、この発明の構成は下端にチゼル等の工具を進
退自在に取付け、内部には下降のとき工具を打撃するピ
ストンを嵌装し１こシリンダに、ピストンの中程外周の
大径部の下［ＩＩ］ｉこ油圧を加える下室と、大径部の
上方に油を収容する中室とを設け、同じくシリンダの上
部にはピストンの上端番こガス圧力を加える上室を設け
、前記大径部の外周には周溝を設け、給油口２よひ排油
口を有する自動切換弁番こは下降位置でシリンダ内の下
室を給油口に通じるとともに、中室を排油口に通じ、上
昇位置で下室を給油口に通じるとともに中室を給油口に
通じる弁体を有する弁室を設け、この弁室の上部には給
油口から加わる油圧により弁体を押下する昇降杆を設け
、さらに前記切換弁とシリンダ間には、ピストンが下降
位置のとき、その大径部の周溝と排油口を通じ、ピスト
ンが上昇位置のとき、大径部で遮断される油路と、ピス
トンが下降位置のとき、その大径部の周溝により前記油
路に連通され、ピストンの上昇時にはシリンダ内の下室
と弁体の上端の鍔の下面番こ対する弁室を連通させて鍔
の下面に油圧加え、弁体を昇降杆の押出力昏こ抗して押
上する１こめの油路を設けてピストンの下降時Ｏこ乏い
てもシリンダ内の下室が排油口【こ連通しないようにし
たものである。That is, the structure of the present invention is such that a tool such as a chisel is attached to the lower end of the cylinder so that it can move forward and backward, and a piston that hits the tool when descending is fitted inside the cylinder. [II] A lower chamber for applying oil pressure and a middle chamber for storing oil above the large diameter part are provided, and an upper chamber for applying gas pressure from the upper end of the piston is also provided at the upper part of the cylinder. A circumferential groove is provided on the outer periphery of the diameter part, and the automatic switching valve has two oil fill ports and an oil drain port.In the lowered position, the lower chamber in the cylinder communicates with the oil fill port, and the middle chamber communicates with the oil drain port. In the raised position, a valve chamber is provided with a valve body whose lower chamber communicates with the oil supply port and whose middle chamber communicates with the fuel supply port, and an elevating rod is provided above the valve chamber to push down the valve body by hydraulic pressure applied from the fuel supply port. Furthermore, between the switching valve and the cylinder, there is an oil passage that passes through the circumferential groove and the oil drain port of the large diameter part of the piston when the piston is in the lower position, and is blocked by the large diameter part when the piston is in the upper position. When the piston is in the lowered position, it communicates with the oil passage through the circumferential groove of its large diameter part, and when the piston moves up, the lower chamber in the cylinder and the valve chamber on the lower surface of the flange at the upper end of the valve body communicate with each other. By applying hydraulic pressure to the bottom surface, we installed an oil passage that pushes the valve body up against the pushing force of the lifting rod, so that even if the piston runs out of oxygen when descending, the lower chamber in the cylinder will not communicate with the oil drain port. This is how it was done.

以下にこの発明の詳細を添付図面に示す一実施例に基づ
いて説明する。The details of the present invention will be explained below based on an embodiment shown in the accompanying drawings.

Ｎ−こ２いて、１はシリンダ、２はその内部に嵌装した
ピストンで、その中程外周に大径部３が一体に形成され
ている。シリンダ１の内側Ｇこけ大径部３の下部となる
下室４を形成し、大径部３の上部（こ中室５を形成し、
ピストン２の上方にけ上室６を形成する。ま１こ、シリ
ンダ１の下端〔こチゼル７を一定の範囲内で摺動し得る
よう（こ嵌装して下降してきたピストン２の下端でチゼ
ル７の上端が打撃されるようにする。また、前記、大径
部３の外周には周溝８が設けである。In N-2, 1 is a cylinder, 2 is a piston fitted inside the cylinder, and a large diameter portion 3 is integrally formed on the outer periphery of the cylinder. The inner side G of the cylinder 1 forms a lower chamber 4 which is the lower part of the large diameter part 3, and the upper part of the large diameter part 3 (which forms the middle chamber 5,
An upper chamber 6 is formed above the piston 2. First, make sure that the lower end of the cylinder 1 allows the chisel 7 to slide within a certain range so that the upper end of the chisel 7 is struck by the lower end of the piston 2 that has been fitted and descended. As mentioned above, a circumferential groove 8 is provided on the outer periphery of the large diameter portion 3.

９はシリンダ１の一側に設けた目動切換弁Ａの弁箱で、
その弁箱同の弁室１１に昇降自在の弁体１０を設け、弁
室１１の内周には上中下３段の突縁１２，１３．１４を
設け、弁体１０の上端外周には突縁１２上番こ位置する
鍔１６を設け、弁体１０の中間部外周には周溝１５を設
け、弁体１０の中心部に（才上昇位置で弁室１１の上下
を連通させ、下降位置で下端開口が弁室１１の底部で遮
断される連通孔１８と、この連通孔を突縁１４より下方
の弁室１１に通じる孔１９を設ける。9 is the valve box of the variable switching valve A installed on one side of the cylinder 1;
A valve body 10 that can be raised and lowered is provided in the valve chamber 11 of the valve box, and the inner periphery of the valve chamber 11 is provided with three stages of upper, middle, and lower projecting edges 12, 13, and 14, and the outer periphery of the upper end of the valve body 10 is A flange 16 is provided on the upper side of the flange 12, and a circumferential groove 15 is provided on the outer periphery of the intermediate portion of the valve body 10. A communicating hole 18 whose lower end opening is blocked at the bottom of the valve chamber 11 at this position, and a hole 19 communicating this communicating hole with the valve chamber 11 below the flange 14 are provided.

２０は弁室１１の上端から下方へ突出させＴ二突部でそ
の中心の孔には弁体１０の上端に接触する昇降杆２１を
はめであるが、昇降杆２１の横断面１＃（４前記鍔１６
の、下向の面積より小さい。Reference numeral 20 designates two T protrusions that protrude downward from the upper end of the valve chamber 11, and a lifting rod 21 that contacts the upper end of the valve body 10 is fitted into the hole in the center. Said tsuba 16
is smaller than the downward area of .

２２はＤη記クシリンダ１下室４と突縁１２．１３間の
弁室１１を連通させる油路、２３は中室５と突縁１３，
１４間の弁室１１を連通させる油路、２４は下降位置の
ピストン２の大径部３の周溝８と弁室１１の下部突縁１
２の直上を連通させる油路、２５は下降位置の周溝８の
上部と排油口３０を通じる油路である。22 is an oil passage that communicates the valve chamber 11 between the lower chamber 4 of the cylinder 1 and the flange 12, 13, 23 is the middle chamber 5 and the flange 13,
An oil passage 24 communicates the valve chamber 11 between the circumferential groove 8 of the large diameter portion 3 of the piston 2 in the lowered position and the lower flange 1 of the valve chamber 11.
An oil passage 25 communicates with the upper part of the circumferential groove 8 in the lowered position and the oil drain port 30.

２６は弁箱９【こ設けた給油口で突縁１２，１３間の弁
室１１と、前記昇降杆２１上の加圧室２７と、ダイヤフ
ラム２８を有する蓄圧室２９番こ通じている。３０は排
油口で弁室１１の上部と油路２５　　　“□に通じてい
る。Reference numeral 26 communicates with the valve chamber 11 between the projecting edges 12 and 13, the pressurizing chamber 27 on the lifting rod 21, and the pressure accumulating chamber 29 having the diaphragm 28 through an oil supply port provided in the valve box 9. 30 is an oil drain port that communicates with the upper part of the valve chamber 11 and the oil passage 25"□.

な３、図示省略しであるが、上室６には圧縮空気やガス
を封入し上室６内のカスが逃けないように上室６の上部
に逆止弁を設け、蓄圧室２９のダイヤフラム上部の室に
も一定圧力のガスを封入する。3. Although not shown, the upper chamber 6 is filled with compressed air or gas, and a check valve is installed in the upper part of the upper chamber 6 to prevent the waste in the upper chamber 6 from escaping. The chamber above the diaphragm is also filled with gas at a constant pressure.

この発明は上記の構成であり。、第１図はピストン２が
最下位となり、弁体１０も最下位となり、このとき弁体
１０の下端開口は弁室１１の底部に密着して閉じられて
いる。この状態で給油口２６に所定圧力の圧力油を供給
すると、この圧油は給油口２６→突縁１２，１３間の弁
室１１→油路η→下室４と流れて大径部３の下面に油圧
を加え、中室５の油は油路２３→突縁１３より下部の弁
室１１→弁体１０の孔１９→連通孔１８→弁室１１の上
部→排油口３０と流れて排出されるからピストン２は王
室６内のガスを圧縮しつつ上昇する。This invention has the above configuration. In FIG. 1, the piston 2 is at the lowest position, and the valve body 10 is also at the lowest position, and at this time, the lower end opening of the valve body 10 is in close contact with the bottom of the valve chamber 11 and closed. When pressure oil at a predetermined pressure is supplied to the oil filler port 26 in this state, this pressure oil flows from the oil filler port 26 to the valve chamber 11 between the flange 12 and 13 to the oil passage η to the lower chamber 4 and into the large diameter portion 3. When hydraulic pressure is applied to the lower surface, the oil in the middle chamber 5 flows from the oil passage 23 → the valve chamber 11 below the flange 13 → the hole 19 of the valve body 10 → the communication hole 18 → the upper part of the valve chamber 11 → the oil drain port 30. Since the gas is discharged, the piston 2 rises while compressing the gas in the royal chamber 6.

このとき油圧の一部は加圧室２７に加わり、昇降杆２１
を押下してこれにより弁体１０を弁室１１の底部に押し
付けている。At this time, part of the hydraulic pressure is added to the pressurizing chamber 27 and the lifting rod 21
is pressed down, thereby pressing the valve body 10 against the bottom of the valve chamber 11.

第２図のように、ピストン２が上り大径部３の下端が油
路２４より上位となると下室４が油路Ｕに通じるので、
下室４に加わってい１こ油圧が油路２４を経て弁体１０
の鍔１６の下面に加わる。鍔１６の下面の面積は昇降杆
２１の上端の面積より太きいから弁体１０は昇降杆２１
を押上して上昇する。このため、第３図のように弁体１
０の下端が弁室１１の底面から離れ、弁体１０の周溝１
５か突縁１３の上下の弁室１１を連通させるので、給油
口２６からの油圧が突縁１３の上下の弁室１１→油路２
３を経て上室５に加わり、同時（こ油路２２を経て下室
４にも加わる。As shown in FIG. 2, when the piston 2 rises and the lower end of the large diameter portion 3 is above the oil passage 24, the lower chamber 4 communicates with the oil passage U.
One hydraulic pressure applied to the lower chamber 4 passes through the oil passage 24 to the valve body 10.
It is added to the lower surface of the tsuba 16. Since the area of the lower surface of the flange 16 is larger than the area of the upper end of the lifting rod 21, the valve body 10 is attached to the lifting rod 21.
Push up to rise. For this reason, as shown in Fig. 3, the valve body 1
0 is separated from the bottom of the valve chamber 11 and the circumferential groove 1 of the valve body 10
5, the upper and lower valve chambers 11 of the flange 13 are communicated with each other, so that the oil pressure from the oil supply port 26 is transferred from the upper and lower valve chambers 11 of the flange 13 to the oil passage 2.
3, it joins the upper chamber 5, and at the same time, it also joins the lower chamber 4 through the oil passage 22.

従って、大径部３の上下面に加わる油圧がバランスする
からピストン２は上室６内のガス圧により急速に下降し
てチゼル７を打撃する。この間排油口３０へはいずれの
室からの浦の流出もなく、下室４内の油は油路２２、弁
室１１、油路２３を　１経て中室５１こ流入している。Therefore, since the hydraulic pressures applied to the upper and lower surfaces of the large diameter portion 3 are balanced, the piston 2 rapidly descends due to the gas pressure in the upper chamber 6 and strikes the chisel 7. During this time, no oil flows out from any of the chambers to the oil drain port 30, and the oil in the lower chamber 4 flows into the middle chamber 51 via the oil passage 22, the valve chamber 11, and the oil passage 23.

また、下側の大径部３が油路２４と油路２５を遮断して
いるかぎり鍔１６の下面の油は逃げられないので弁体１
０は上昇位置に保持される。In addition, as long as the lower large diameter portion 3 blocks the oil passage 24 and the oil passage 25, the oil on the lower surface of the collar 16 cannot escape, so the valve body 1
0 is held in the raised position.

大径部３の周溝８が第４図のように油路２４゜２５を通
じる位置に下ると、鍔１６の下側の弁室１１内の油が油
路２４→周溝８→油路２５と流れて排油口３０から排出
されるので鍔１６の押上刃はなくなり、昇降杆２１の押
下刃によって弁体１０が押下されて最初の状態に戻る。When the circumferential groove 8 of the large diameter portion 3 descends to the position where it communicates with the oil passages 24 and 25 as shown in FIG. 25 and is discharged from the drain port 30, the push-up blade of the collar 16 disappears, and the valve body 10 is pushed down by the push-down blade of the lifting rod 21, returning to the initial state.

従って給油口２６番こ油圧が加わっている限り、上記の
作用が繰返されてピストン２が上下し、チゼル７が連打
される。Therefore, as long as oil pressure is applied to the oil supply port 26, the above-mentioned action is repeated, the piston 2 moves up and down, and the chisel 7 is repeatedly struck.

また、上記の作用ｆこといて、下室４と中室５間ｔこお
ける浦の移動にさいしての油の過不足は両室４．５か蓄
圧室２９や給油口２６に通じているので自動的に調節さ
れる。In addition, as for the above-mentioned effect, the excess or deficiency of oil during the movement of the ura between the lower chamber 4 and the middle chamber 5 is caused by the fact that both chambers 4.5, 4.5, or the pressure accumulation chamber 29 or the oil filler port 26 are connected to each other. automatically adjusted.

この発明は上記のような作用を行なうものであるが、そ
の効果（まつきの通りである。This invention performs the above-mentioned functions, and its effects (as shown in Matsuki).

第３図のようｔこピストン２が下降行程【こ入ったとき
、切換弁Ａｌこより下室４と中室５と蓄圧室怨と給油口
２６とが連通ずる。As shown in FIG. 3, when the piston 2 enters the downward stroke, the lower chamber 4, the middle chamber 5, the pressure accumulation chamber, and the oil supply port 26 communicate with each other through the switching valve Al.

このため、ピストン３の下降時に油路２２，２３、突縁
１２，１３間の弁室１１などの油圧の急激な低下が殆兄
どなく、従ってキャビテーションの発生やそれに伴なう
騒音振動の発生２よび下室４や油路２２などの損傷の３
それがない。また、切換弁Ａの弁体１０の昇降は常に油
圧【こより押下されている昇降杆２１蚤こよる押下刃と
、ピストン２の大径部３とこの大径部３に設けた周溝８
により切換えられる油路２４から弁体１０の鍔１６の下
面に加わる油圧による押上刃とにより行なわれるので、
作動がきわめて確実である。For this reason, when the piston 3 descends, there is almost no sudden drop in oil pressure in the oil passages 22, 23, the valve chamber 11 between the flange 12, 13, etc., and therefore cavitation and accompanying noise and vibration occur. 2 and damage to the lower chamber 4, oil passage 22, etc.
There isn't that. In addition, the lifting and lowering of the valve body 10 of the switching valve A is always carried out using hydraulic pressure.
This is done by pushing up the blade by hydraulic pressure applied to the lower surface of the flange 16 of the valve body 10 from the oil passage 24 which is switched by the
Operation is extremely reliable.

な３、実施例ではシリンダ１や弁箱９を一体に画いであ
るが、これは油圧回路をわかり易くするためであり、実
際には各部を分割して製作したのち組立てるものである
ことはいうまでもない。3. In the example, the cylinder 1 and valve box 9 are shown as one, but this is to make the hydraulic circuit easier to understand, and it goes without saying that in reality, each part is manufactured separately and then assembled. Nor.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図ないし、第４図はこの発明の衝撃動工具の作動を
示す縦断側面図である。 １・・・シリンダ、２・・・ピストン、３・・・大径部
、４・・・下室、５・・・中室、６・・・上室、７・・
・チゼル、８・・・周溝、１０・・・弁体、１１・・・
弁室、１６・・・鍔、２１・・・昇降杆、２４．２５・
・・油路、２６・・・給油口、田・・・排油口、Ａ・・
・自動切換弁。 特許出願人　　日本ニューマチック工業株式会君同　　
代理人　　　鎌　　　１）　　又　　　ニ手続補正書（
峡） 昭和５８年１１月４８ １、事件の表示 昭和５７年特許願第２３４７７射 ２、発明の名称 １近ノ芦動工具 ３、補正をする者 事件との関係　特許出願人 住所　　　大阪市東成区神路４丁目１１番５号氏名（名
称）１」本ニューマチック工業株式会社５゜ 昭和　　　　　年　　　　　月　　　　　日　　（鈍送
日）６、補正により増加する発明の数 桶　　正　　の　　内　　容 １、明則四の「特許請求の範囲」ｒ別紙の通９匍正しま
す。 ２明細ｄ第λ頁未行の「ハンマ」７「ピストン」とイｌ
ｉ正し′ます。 ３、同第３貝／と行目の「下叫位ｊｔＪｋｒＭｉＪ進立
１直」と匍正します。 任、同効３頁／９行目から本行の［上列・位：ｍＪｋｒ
後退位置」と補正します。 ５、同第グ貞／イ１目から／／行目の「この弁室・・・
・・・・・設けて」７下記のｍシ補正します。 ［さらにピストンが下降位置のとき、前記弁体τ油圧に
よりＤＩＪ進位瞳位置持する手段と、ピストンが上昇位
置のとき前記弁体ケ油圧によシ後退させる手段を設けて
］ ０、四重タ貝７２行日から７４を行目の「上昇位置で・
・・・遮；すｒきれる」七「弁室１１の上下荀ノ事、妨
させる」とＭ正します。 °７．同第乙貝１０１１目から／／１−テ１目の「３０
ば　・・でいる。」・ト削除します。 ８、同第３貝／ざ行目の１最下位」のつぎに［の１４１
Ｊ進泣＋ｍＪと加入します０ ９、同第９貝７９の「閉じられて」宿削除します。 １０、同病７貝７０行目の「押し付けで」のつぎに「前
進位置に保持して」と加入します。 １１、同君７．ケ／乙行目の「上昇Ｊτ「後退」と抽ｊ
Ｅします。 １２、同第了頁ｊ行目の「打撃する。」の・りき゛に−
Ｆ記の週９加入します。 「ピストン２の大径部３よシ上側の径が下ｔｉｌｌの径
よシ小さい錫会は、上室６内のガス圧に加えて、ピスト
ン２の上下断面差に゛よシ生じる油圧が・働くので打撃
力は強くなる１、」 １３、同第ざ頁７０行目から／／行目の「上昇位ｒａ　
Ｊｔ「後退位置」と浦正し址す。 １４、同１υ〔７３行目から／り行目の「また、切戻弁
Ａ　・・　で、める。」を削除し−ます。 １５、同第９貝７９行目と末行の間に下記の、Ｊｆｌシ
〃１］入します。 ［第Ｓ図は目動切換弁Ｎの他の実施例７示すものでめる
。この実施例の場合、弁体１０が上昇したときが目ｉＪ
進位置となシ、下降したときが後退位置となる。 すなわち、弁室１１の内周の」二中下３段の突縁１２．
１３，１４の下部にさらに突縁１４′を設け、給油口２
６ケ突縁１４　、１４’間と、突縁１２の上部の弁室°
１１内にそれぞれ埋辿させ、下室４に＋ｈｉじる油路２
２は突縁１４　、１４’間の弁室１１に連通させる。排
油口３　ｊＪは弁室１１の上端と、突縁ｉ２．１３間の
弁室１１に、姐じ、油路２３は災１．求１３，１４間の
弁室１１、油路２４は弁室１１の上端に通じる。 弁体１０の周（１イ１５は第Ｓ図のような上昇、すなわ
ちｌ−＋Ｊ進時にズ縁１３の上下を通じ、下降すなわち
後退時に突６縁１４の上下ヶ通じる位置に設け、弁体１
υの上端は鍔１６上に契出し、弁室１１の上部の凹所に
はまっているが、弁体１０の鍔１６よシ上の部分は小径
として、湾°１６の上面の面積は下面の面積よシ大きく
する。また、弁体１Ｕの中心には排油口３０に弁室１１
の下端にＩｔ！１じる建通孔１８を二町している。 その他の各部や油路は第１凶ないし第μ図の実施例と同
じでのる。 上記の犬施例において、５ｇｊ図の状態はピストン２が
最下位とな９、弁体１Ｕが最上位の前進位置となってい
る。この状態で給油口２６に所定圧力の圧力油全供給す
ると、この圧油は給油口２６→突祿１４　、１４’間の
弁室１１→油路２２→下室４と流れて大径部３の下面に
油圧を加え、中室５の油は油路２３→焚縁１４，１３．
１２１ハ］の弁室１１→徘油口３０と流れて排出される
からピストン２は上室６゛内のガスケ圧猫しつつ上昇す
る。このとき、油圧の一部は突縁１２上の弁室１１に入
９、鍔１６の下部を押上し、鍔１６の上部の弁室１１は
油路２４．ピストン２０大径部３の周溝８．油路２５に
よシ排油口３０に通じているから弁体１０は押上されて
―ｉＪ進位瞳位置持されている。 ビス１−ン２が上シ、大径部３の下端が油ｗｒ２４より
上位となると下室４が油１８２４に、１ｆｆｌしるので
、下室４に加わっていた油圧が油路２４ｋ　ｎ’ｌ＆て
うや体１０の鍔１６の上面に加わる。このとき、銹１６
の下面にも油圧が加わっているが、その面積は１４　ｉ
　６の上面の面積よシも小さいから、鍔１６の上「に加
わる油圧による押圧力の差によって、弁体１０は後退す
る。 弁体１０が後退すると、その周溝１５がズ縁１４の上下
に跨がって油路２２　、２３　ｆ連」出させ、弁体１（
Ｊの周１１“４１５よシ上の部分が油路２３を排油口３
０から通断するので、給油口２６からの油圧が大径部３
の上１面に加わシ、押圧力がバランスするから、ピスト
ン２は上室６内のガス圧によシ急速に下降してチゼ）ｖ
　７を打撃する。ピストン２の上側の径が下側の径よシ
小さい場合には、上室６内のガス圧に加え、ピストンど
の上下断面差によシ生じる油圧が働くので打撃力が強く
なる。この間排油口３ｏへはいずれの至からの油の流圧
もなく、下室４内の油は油路２２．弁室１１．油路２３
を経て中室５へ流入している。また、″［側の大径部３
が油路２４と油路２５を遮断しているかぎシ鍔１６の上
面の油は逃げられないので弁体１０は後退位置に保持さ
れる。 大径部３の周溝８が油路２４．２５に通じる位置に下る
と、鍔１６の上側の弁室１１内の油が油路２４→周購８
→油路２５と流れて排油口３０から排出されるので鍔１
６の押下刃はなくなり、鍔゛１６のｆ部に加わる油圧に
よって弁体１０が押し上げられて最初の状態に戻る。従
って給油口２６に油圧が加わっているｌ恨９、上記の作
用が繰返されてピストン２が」二下し、チゼル°７が連
打される。 第５図の実施例は上記のように自動切換弁Ａの弁体１０
の動きは哨／図ないし第５図の×施例の逆になるが、そ
の作用および効果は第７図ないし渠グ図の実施例と全く
同じである。」１６、同第１θ頁乙行目の「側面図でめ
る。」を丁記の通り而正します。 「１ＩＩｌｊ而図、第５図は他の芙施例オ示す縦制御１
１面図である。」 １７、ａｓ図”ｌ：　Ｊ’ｊ　ｒ１式’７）　、”ａｔ
　’）　’１％ｆｆ充Ｌｔす。 特許請求の範囲1 to 4 are longitudinal sectional side views showing the operation of the impact power tool of the present invention. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Piston, 3... Large diameter part, 4... Lower chamber, 5... Middle chamber, 6... Upper chamber, 7...
・Chisel, 8... Circumferential groove, 10... Valve body, 11...
Valve chamber, 16... Tsuba, 21... Lifting rod, 24.25.
...Oil channel, 26...Oil filler port, Field...Oil drain port, A...
・Automatic switching valve. Patent applicant: Japan Pneumatic Industry Co., Ltd.
Agent Kama 1) Also, 2. Procedural amendment (
1. Indication of the case 1988 Patent Application No. 23477 2. Name of the invention 1. Close-up reed tool 3. Relationship with the person making the amendment Patent applicant address Higashinari-ku, Osaka City 4-11-5, Jinji Name (Name) 1 Hon Pneumatic Kogyo Co., Ltd. 5 Showa Year, Month, Day (Date of slow delivery) 6, Number of inventions to be increased by amendment Contents 1, Meishoku 4 "Scope of Patent Claims" r Attachment 9 has been corrected. 2 Specification d Page λ still missing “Hammer” 7 “Piston” and I
I'm correct. 3. Correct the 3rd shell / and line of the same sentence as ``Down shout position jtJkrMiJ Advancing 1st shift''. From page 3/9th line to the main line [Top row/place: mJkr]
Correct it to "Reverse position". 5. From the 1st line to the ``This bento room...''
7. Make the following corrections. [Furthermore, there is provided means for maintaining the DIJ advancement pupil position by the hydraulic pressure of the valve body τ when the piston is in the lowered position, and means for retracting the valve body by the hydraulic pressure when the piston is in the raised position] 0. From the 72nd line of the shell to the 74th line "in the rising position...
7. ``I'm going to block the upper and lower parts of valve chamber 11,'' M corrected. °7. From the 1011th otogai //1-te 1st "30"
I'm... ”・To delete. 8. 3rd shell of the same / 1st lowest position of the row
I will join J Shin Cry + mJ 0 9, and I will delete the "closed" inn of the 9th shell 79. 10. In the 70th line of the same disease, after ``by pressing'', add ``hold in the forward position''. 11. Do you 7. K/In the second line, “ascent Jτ” and “retreat” are drawn.
E. 12. On the jth line of the last page of the same page, the phrase “to strike.”
I will be joining Week 9 of F-ki. "The diameter of the upper side of the large diameter part 3 of the piston 2 is smaller than the diameter of the lower till, in addition to the gas pressure in the upper chamber 6, the hydraulic pressure generated due to the difference in the vertical cross section of the piston 2. 13, from line 70 of the same page to // line ``Rising rank ra
Jt "retreat position" and Uramasa. 14. 1υ [Delete "Also, close with cut-back valve A..." from line 73 to line 2. 15. Enter the following Jfl code 1] between the 79th line and the last line of the 9th shell. [Figure S shows another embodiment 7 of the variable switching valve N. In the case of this embodiment, the point when the valve body 10 is raised is iJ.
When it is in the forward position, it is in the backward position when it is lowered. That is, the ridges 12.
A projecting edge 14' is further provided at the bottom of 13 and 14, and the fuel filler port 2
The valve chamber between the six projecting edges 14 and 14' and the upper part of the projecting edge 12°
Oil passages 2 buried in each of the lower chambers 4 and 2
2 communicates with the valve chamber 11 between the projecting edges 14 and 14'. The oil drain port 3jJ is connected to the valve chamber 11 between the upper end of the valve chamber 11 and the flange i2. The valve chamber 11 between the valve chambers 13 and 14 and the oil passage 24 communicate with the upper end of the valve chamber 11. The circumference of the valve body 10 (1-15 is provided at a position where the upper and lower sides of the protrusion 6 edge 14 communicate with each other when ascending as shown in FIG.
The upper end of υ protrudes above the flange 16 and fits into the recess at the top of the valve chamber 11, but the portion of the valve body 10 above the flange 16 has a small diameter, and the area of the upper surface of the bay 16 is equal to that of the lower surface. Increase the area. In addition, a valve chamber 11 is provided at the center of the valve body 1U at the oil drain port 30.
At the bottom of It! It is two towns along the 1st and 18th tunnels. Other parts and oil passages are the same as those in the embodiments shown in FIGS. In the dog embodiment described above, in the state shown in Figure 5gj, the piston 2 is at the lowest position 9, and the valve body 1U is at the highest forward position. In this state, when all the pressure oil at a predetermined pressure is supplied to the oil supply port 26, this pressure oil flows from the oil supply port 26 to the valve chamber 11 between the ridges 14 and 14', to the oil passage 22, and then to the lower chamber 4, and flows through the large diameter portion 3. Applying hydraulic pressure to the lower surface of the chamber 5, the oil in the middle chamber 5 flows from the oil path 23 to the rim 14, 13.
Since the oil flows from the valve chamber 11 of the upper chamber 6 to the floating oil port 30 and is discharged, the piston 2 rises while compressing the gas in the upper chamber 6. At this time, a part of the hydraulic pressure enters the valve chamber 11 on the flange 12 and pushes up the lower part of the collar 16, and the valve chamber 11 in the upper part of the collar 16 moves into the oil passage 24. Circumferential groove of the large diameter portion 3 of the piston 20 8. Since the oil passage 25 communicates with the oil drain port 30, the valve body 10 is pushed up and held at the -iJ advancement pupil position. When the screw 1-2 is on the upper side and the lower end of the large diameter part 3 is above the oil wr24, the lower chamber 4 will be 1ffl into the oil 1824, so the hydraulic pressure applied to the lower chamber 4 will be transferred to the oil path 24k n'l & It is added to the upper surface of the guard 16 of the body 10. At this time, 16
Hydraulic pressure is also applied to the bottom surface of the , but its area is 14 i
Since the area of the upper surface of the valve 6 is small, the valve body 10 is moved back due to the difference in the pressing force due to the hydraulic pressure applied to the upper part of the flange 16. straddle the oil passages 22 and 23 f, and let the valve body 1 (
The part above the circumference 11"415 of J connects the oil passage 23 to the oil drain port 3.
Since the connection is made from 0, the oil pressure from the oil filler port 26 is transferred to the large diameter portion 3.
Since the pressing force applied to the upper surface is balanced, the piston 2 rapidly descends due to the gas pressure in the upper chamber 6)
Hit 7. When the upper diameter of the piston 2 is smaller than the lower diameter, in addition to the gas pressure in the upper chamber 6, the hydraulic pressure generated by the difference in the vertical cross section of the piston acts, so that the striking force becomes stronger. During this time, there is no flow pressure of oil from any of the outlets to the oil drain port 3o, and the oil in the lower chamber 4 is flowing through the oil passage 22. Valve chamber 11. Oil road 23
It flows into the middle chamber 5 through the. In addition, the large diameter part 3 on the ``[ side
Since the oil on the upper surface of the hook collar 16 which blocks the oil passage 24 and the oil passage 25 cannot escape, the valve body 10 is held in the retracted position. When the circumferential groove 8 of the large diameter portion 3 descends to the position where it communicates with the oil passage 24.25, the oil in the valve chamber 11 above the collar 16 flows from the oil passage 24 to the circumferential passage 8.
→It flows through the oil passage 25 and is discharged from the oil drain port 30, so the collar 1
The pressing blade 6 disappears, and the valve body 10 is pushed up by the hydraulic pressure applied to the f section of the flange 16 and returns to its initial state. Therefore, when oil pressure is applied to the oil filler port 26, the above action is repeated, the piston 2 moves downward, and the chisel 7 is repeatedly struck. The embodiment of FIG. 5 has the valve body 10 of the automatic switching valve A as described above.
Although the movement is the opposite of the × embodiment shown in Figures 7 to 5, its operation and effect are exactly the same as the embodiments shown in Figures 7 to 5. 16, ``Side view'' in line 2 of page 1θ of the same page will be corrected as stated. Figure 5 shows another example of vertical control 1.
It is a front view. "17, as figure"l: J'j r1 formula'7), "at
') '1%ff charge Lt. Scope of claims

Claims (1)

【特許請求の範囲】 下端にチゼル等の工具を進退自在に取付け、内部には下
降のとき工具を打撃するピストンを嵌装したシリンダに
、ピストンの中程外周の大径部の下面をこ油圧を加える
下室と大径部の上方に油を収容する中室とを設け、同じ
くシリンダの上部にはピストンの上端にガス圧力を加え
る上室を設け、前記大径部の外周には周溝を設け、給油
口２よび排油口を有する自動切換弁には下降位置でシリ
ンダ内の王室を給油口に通じるとともＧこ、中室を排油
口に通じ、上昇位置で下室を給油口に通じるとともに中
室も給油口に通じる弁体を有する弁室を設けこの弁室の
上部には給油口から加わる油圧により弁体を押下する昇
降杆を設け、さらに前記切換弁とシリンダ間にＣｔ、ピ
ストンが下降位置のとき、その大径部の周溝と排油孔を
通じ、ピストンか」−昇位置のとき大径部で遮断される
油路と、ピストンが下降位置のとき、その大径部の周溝
【こより前記油路に連通され、ピストンの上昇時にはシ
リンダ内の下室と弁体の上端の鍔の下面に対する弁室を
連通させて鍔の下面に油圧を加え、弁体を昇降杆の押下
刃に抗して押上する１こめの油路を設けｆこ衝撃動工具
。[Claims] A tool such as a chisel is attached to the lower end of the cylinder so that it can move forward and backward, and a piston that hits the tool when descending is fitted inside the cylinder. A lower chamber for applying gas pressure to the upper end of the piston is provided in the upper part of the cylinder, and a circumferential groove is provided on the outer periphery of the large diameter part. The automatic switching valve, which has an oil filler port 2 and an oil drain port, has a main chamber in the cylinder that connects to the oil filler port in the lower position, a middle chamber that connects to the oil drain port, and a lower chamber in the raised position to refuel. A valve chamber is provided with a valve body that communicates with the fuel filler port and whose middle chamber also communicates with the fuel filler port.A lifting rod is provided in the upper part of this valve chamber to push down the valve body using hydraulic pressure applied from the fuel filler port. Ct, when the piston is in the lowered position, the oil passage through the circumferential groove and the oil drain hole of the large diameter part of the piston is cut off by the large diameter part when it is in the raised position, and the oil passage that is blocked by the large diameter part when the piston is in the lowered position. The circumferential groove of the diameter part communicates with the oil passage, and when the piston moves up, the lower chamber in the cylinder communicates with the valve chamber against the lower surface of the flange at the upper end of the valve body, and hydraulic pressure is applied to the lower surface of the flange, causing the valve body to move. An impact power tool with one oil passage that pushes up against the pushing blade of the lifting rod.