JPH0335897Y2 - - Google Patents
Info
- Publication number
- JPH0335897Y2 JPH0335897Y2 JP1986076912U JP7691286U JPH0335897Y2 JP H0335897 Y2 JPH0335897 Y2 JP H0335897Y2 JP 1986076912 U JP1986076912 U JP 1986076912U JP 7691286 U JP7691286 U JP 7691286U JP H0335897 Y2 JPH0335897 Y2 JP H0335897Y2
- Authority
- JP
- Japan
- Prior art keywords
- crank chamber
- detection device
- lubricating oil
- oil
- compressor
- 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
- 238000001514 detection method Methods 0.000 claims description 42
- 239000010687 lubricating oil Substances 0.000 claims description 41
- 239000003921 oil Substances 0.000 claims description 31
- 238000004891 communication Methods 0.000 claims description 15
- 230000007257 malfunction Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Compressor (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、圧縮機のクランク室に貯溜された
潤滑油のレベルを検出して警報等を行う飛沫給油
式圧縮機の潤滑油検出装置に関するものである。[Detailed description of the invention] [Industrial application field] This invention relates to a lubricating oil detection device for a splash-lubricated compressor that detects the level of lubricating oil stored in the crank chamber of the compressor and issues an alarm. It is something.
給油式圧縮機においては、各摺動部に潤滑油を
常時供給することが必要であり、この潤滑油がな
くなると焼付きあるいは損傷等の大事故が発生す
る。潤滑油の給油方式には種々のものがあるが構
成が簡単な飛沫給油式が多く採用されている。こ
の飛沫給油式は、クランク室に潤滑油を貯溜させ
ておき、連接棒と共に回転移動する油かき羽根に
よつて潤滑油の飛沫を生成し、これを各摺動部へ
供給するものである。この時、潤滑油がなくなる
と、上記のような焼付き、損傷が発生するため、
潤滑油の量の日常確認と補給作業が重要な事項と
なつており、潤滑油の検出装置（オイルセンサ）
を圧縮機に備えることが採用されている。第２図
はこの種の従来の飛沫給油式圧縮機の潤滑油検出
装置を示す要部断面図である。図において、１は
往復ピストンのクランク軸などの圧縮要素の収納
室となるクランク室で、下部にボス部１ａが形成
されている。２はフロート式のレベル検出装置本
体で、その取付部３が上記クランク室１のボス部
１ａと螺合されている。即ち、ボス部１ａの内周
壁には雌ねじが形成されており、このねじ溝と螺
合する雄螺子が取付部３の外周壁に形成されてい
る。更に、レベル検出装置本体２と取付部３とは
シール部材４を介してボルト５により外部を密封
して固定されている。又、レベル検出装置本体２
及び取付部３にはそれぞれ連通孔２ａ，３ａが設
けられており、クランク室１内とレベル検出装置
本体２内とが同一の圧力となるように連通されて
いる。そして、レベル検出装置本体２内にはクラ
ンク室１に貯溜されている潤滑油６のレベルに応
じて上下方向に移動するフロート７が配設されて
おり、そのレベルが下限以下になると警報、停止
等が行われるようになつている。
In an oil-supplied compressor, it is necessary to constantly supply lubricating oil to each sliding part, and if this lubricating oil runs out, major accidents such as seizure or damage will occur. There are various lubricating oil supply methods, but the splash oil supply method, which has a simple structure, is often adopted. In this splash lubrication type, lubricating oil is stored in the crank chamber, and an oil scraper that rotates together with the connecting rod generates droplets of lubricating oil, which are then supplied to each sliding part. At this time, if the lubricating oil runs out, seizing and damage as described above will occur, so
Daily checking of the amount of lubricating oil and replenishment work have become important matters, and lubricating oil detection devices (oil sensors) are required.
It has been adopted to equip the compressor with FIG. 2 is a sectional view of a main part of a lubricating oil detection device for a conventional splash-lubricated compressor of this type. In the figure, reference numeral 1 denotes a crank chamber which serves as a storage chamber for a compression element such as a crankshaft of a reciprocating piston, and has a boss portion 1a formed at its lower part. Reference numeral 2 denotes a float-type level detection device main body, the mounting portion 3 of which is screwed into the boss portion 1a of the crank chamber 1. That is, a female thread is formed on the inner circumferential wall of the boss portion 1a, and a male thread that engages with this thread groove is formed on the outer circumferential wall of the mounting portion 3. Further, the level detection device main body 2 and the mounting portion 3 are fixed to each other in a sealed manner from the outside with a bolt 5 via a seal member 4. In addition, the level detection device main body 2
The mounting portion 3 is provided with communication holes 2a and 3a, respectively, so that the inside of the crank chamber 1 and the inside of the level detection device main body 2 are communicated with each other so that the pressure is the same. A float 7 that moves up and down according to the level of the lubricating oil 6 stored in the crank chamber 1 is installed in the level detection device main body 2, and when the level falls below the lower limit, an alarm is issued and a stop is issued. etc. are increasingly being carried out.
次に動作について説明する。第３図ａに示すよ
うに、圧縮機のピストンが往復駆動すると、それ
に伴なつて連接棒９に取り付けられた油かき羽根
８が潤滑油６をかき上げて飛沫を生成し、この潤
滑油６の飛沫がクランク室１内の各摺動部へ供給
される。この時、油かき羽根８によつてかき上げ
られた潤滑油６の大部分は油膜（油の壁）を形成
してクランク室１のレベル検出装置取付側の内壁
に向つて飛び散る。これにより、第３図ｂに示す
ように、クランク室１の内壁に付着した潤滑油は
下方に流れて油膜を生じクランク室１の内壁面と
潤滑油面で囲まれた密閉室が形成され、この密閉
室は油膜の前進と共に体積が減少し、内圧が上昇
する。従つて、検出装置本体２内（フロート室
内）の内圧も高まり、最後に上記油膜が取付部３
の油、空気通路となる連通孔３ａに突入する。そ
して、このようなポンプ現象が次々と繰り返さ
れ、検出装置本体２内の圧力がある程度まで高ま
ると、第３図ｃに示すようにクランク室１内とレ
ベル検出装置本体２内とが油の壁を境目として圧
力差が生じ、検出装置本体２内の圧力がクランク
室１内の圧力より高くなつて、てレベル検出装置
本体２内の油滑油面を押し下げることにより、レ
ベル検出装置本体２内の潤滑油６のレベルが低下
する。この現象はクランク軸の回転数が増す程、
油膜の前進スピード及び油膜で囲われた密閉室の
形成回数が増す程活発になり、又前記回転数が増
す程クランク室１の内壁面を流れ落ちる油膜の量
が増し、検出装置本体２内の潤滑油６のレベル変
化に大きな影響を与えている。そして、この現象
が起きると、実際にはクランク室１内の潤滑油６
の量がまだ十分であるのに下限に達したと検出さ
れ、警報、停止などが発生して、装置の“誤作
動”が生じる。このため、従来よりクランク１室
とレベル検出装置本体２の間にバイパスパイプを
外部から取り付けて両者を連結するとが提案され
ており、これによつて上述のようなポンプ現象が
発生してもクランク室１と検出装置本体２とは常
に同一の内圧となり、装置の誤作動防止を図つて
いた。 Next, the operation will be explained. As shown in FIG. 3a, when the piston of the compressor reciprocates, the oil scraper blade 8 attached to the connecting rod 9 scrapes up the lubricating oil 6 and generates droplets. The droplets are supplied to each sliding part in the crank chamber 1. At this time, most of the lubricating oil 6 scraped up by the oil scraper blade 8 forms an oil film (oil wall) and scatters toward the inner wall of the crank chamber 1 on the side where the level detection device is installed. As a result, as shown in FIG. 3b, the lubricating oil adhering to the inner wall of the crank chamber 1 flows downward to form an oil film, forming a sealed chamber surrounded by the inner wall surface of the crank chamber 1 and the lubricating oil surface. The volume of this sealed chamber decreases as the oil film advances, and the internal pressure increases. Therefore, the internal pressure inside the detection device main body 2 (float chamber) also increases, and finally the oil film reaches the mounting part 3.
The oil and air enter the communication hole 3a, which serves as an air passage. When such a pumping phenomenon is repeated one after another and the pressure inside the detection device main body 2 increases to a certain level, an oil wall forms between the inside of the crank chamber 1 and the inside of the level detection device main body 2, as shown in Fig. 3c. A pressure difference occurs at the boundary, and the pressure inside the detection device main body 2 becomes higher than the pressure inside the crank chamber 1, which pushes down the oil surface inside the level detection device main body 2. The level of lubricating oil 6 decreases. This phenomenon occurs as the rotation speed of the crankshaft increases.
The oil film becomes more active as the forward speed of the oil film increases and the number of times a sealed chamber surrounded by the oil film is formed, and as the rotation speed increases, the amount of oil film flowing down the inner wall surface of the crank chamber 1 increases, and the lubrication inside the detection device body 2 increases. It has a great influence on the level change of oil 6. When this phenomenon occurs, the lubricating oil 6 in the crank chamber 1 actually
It is detected that the lower limit has been reached even though the amount is still sufficient, causing an alarm, shutdown, etc., resulting in a "malfunction" of the device. For this reason, it has been proposed to install a bypass pipe from the outside between the crank chamber 1 and the level detection device main body 2 to connect the two. The chamber 1 and the main body 2 of the detection device always have the same internal pressure to prevent malfunction of the device.
従来の飛沫給油式圧縮機の潤滑油検出装置は上
記のような構成となつており、圧縮機運転中のポ
ンプ現象によつて生じるクランク室１とレベル検
出装置本体２内の圧力差を外部のバイパスパイプ
を連結させることによつて解消しているが、この
バイパスパイプがクランク室の外側に突出しかつ
その先にレベル検出装置本体をとりつけているた
め、圧縮機の移動時等に破損し易すく、その取付
作業も煩わしいという問題点があつた。
The conventional lubricating oil detection device for a splash-lubricated compressor has the above-mentioned configuration, and detects the pressure difference between the crank chamber 1 and the level detection device main body 2 caused by the pump phenomenon during compressor operation to the outside. This problem was solved by connecting a bypass pipe, but since this bypass pipe protrudes outside the crank chamber and the level detection device is attached to the end, it is easily damaged when the compressor is moved. However, there was a problem that the installation work was also troublesome.
この考案は、このような従来のものの問題点に
着目してなされたもので、簡易な構成で装置の誤
作動を防止できる飛沫給油式圧縮機の潤滑油検出
装置を提供することを目的としている。 This invention was made by focusing on the problems of the conventional ones, and aims to provide a lubricating oil detection device for a splash-lubricated compressor that can prevent malfunctions of the device with a simple configuration. .
この考案の飛沫給油式圧縮機の潤滑油検出装置
は、潤滑油が貯溜された圧縮機のクランク室と連
通し、その潤滑油のレベルを検出して警報等を行
うレベル検出装置本体を前記クランク室の外壁面
に直接とりつけてなる飛沫給油式圧縮機の潤滑油
検出装置において、内部にクランク室とレベル検
出装置本体との連通孔を有した遮蔽板を設け、且
つそのクランク室側の側端部に外側に突出した段
部を形成し、該段部に前記連通孔の開口端を設け
ると共に、該段部が前記クランク室の内壁面より
内側にくるように配設したものである。
The lubricating oil detection device for a droplet oil-fed compressor of this invention communicates with the crank chamber of the compressor in which lubricating oil is stored, and detects the level of the lubricating oil and issues an alarm. In a lubricating oil detection device for a splash-lubricated compressor that is directly attached to the outer wall of a chamber, a shielding plate is provided inside which has a communication hole between the crank chamber and the level detection device main body, and the side end on the crank chamber side is provided. A stepped portion protruding outward is formed in the crank chamber, the opening end of the communication hole is provided in the stepped portion, and the stepped portion is arranged inward from the inner wall surface of the crank chamber.
圧縮機運転中に潤滑油がかき上げられて油膜が
形成され、それがクランク室の内壁面から垂れ下
つてくるが、遮蔽板が設けられているのでその油
膜は遮蔽板に一端受け取められる。その時、遮蔽
板の側端部はクランク室の内壁面より内側にくる
ように配設してあり、しかも外端部には外側に突
出した段部を有しそこに連通孔の開口端があるの
で、潤滑油が段部を越えることなく遮蔽板の外周
を流下する。従つて、上記油膜によつて開口端が
閉塞されることがないので、結果的に連通孔は閉
塞されることはなく、クランク室内とレベル検出
装置本体内とは常に同圧となる。よつて、クラン
クケース室内とレベル検出装置本体内の油面レベ
ルが同一となり、検出装置の誤作動が防止され
る。
During compressor operation, lubricating oil is scraped up and an oil film is formed, which hangs down from the inner wall surface of the crank chamber, but since a shielding plate is provided, the oil film is partially caught by the shielding plate. At that time, the side end of the shielding plate is arranged so as to be inside the inner wall surface of the crank chamber, and the outer end has a stepped part that protrudes outward, and the opening end of the communication hole is located there. Therefore, the lubricating oil flows down the outer periphery of the shielding plate without exceeding the stepped portion. Therefore, since the opening end is not blocked by the oil film, the communication hole is not blocked as a result, and the pressure inside the crank chamber and inside the level detection device main body are always the same. Therefore, the oil level in the crankcase chamber and in the level detection device main body become the same, and malfunction of the detection device is prevented.
以下、この考案の一実施例を図面について説明
する。
An embodiment of this invention will be described below with reference to the drawings.
第１図はこの考案に係る飛沫給油式圧縮機の潤
滑油検出装置を示す要部断面図であり、従来の第
２図と同一構成要素の部分については同一符号を
付してある。図中、１は圧縮機のクランク室、１
ａはそのボス部、２はレベル検出装置本体、２ａ
はその連通孔、３は取付部、３ａはその連通孔、
４はシール部材、５は固定用のボルト、６は潤滑
油、７はフロート、８は油かき羽根、１０は上記
取付部３とボルト１１によつて固定されて一体的
に設けられた略筒状の遮蔽板で、クランク室１と
の連通孔１０ａを有し且つその開口端１０ｂが側
端部で外側に突出した段部１０ｃに有している。
そして、この段部１０ｃは、取付時にクランク室
１の内壁面より内側にくるようにしてある。次に
動作について説明する。従来と同様圧縮機が運転
されてクランク軸（図示せず）が回転すると、連
接棒９の下部に取り付けられた油かき羽根８によ
つて潤滑油６がかき上げられて飛沫が発生し、こ
の潤滑油６の飛沫がクランク室１内に各摺動部へ
供給される。その際、かき上げられた潤滑油６に
よつて油膜が形成され、この油膜が第３図ｂ，ｃ
に図示のようにクランク室１の内壁面から垂れ下
がつてクランク室１とレベル検出装置本体たとえ
ばフロート室との連通孔を閉鎖し、密閉室を形成
しようとするが、遮蔽板１０が設けられているた
め、上記クランク室１の内壁面から垂れ下がつた
油膜はこの遮蔽板１０の外周部で受け止められ、
密閉室を形成することはない。即ち、遮蔽板１０
には段部１０ｃが形成されており、その連通孔１
０ａの開口端１０ｂのある側端部は外側に突出し
ているので、クランク室１内の内壁面から流下す
る油膜が上記遮蔽板１０の段部１０ｃを越えずに
外周より流下するため、上記連通孔１０ａの開口
端１０ｂを閉塞するとはない。従つてクランク室
１の内圧とレベル検出装置本体２の内圧に圧力差
は発生せず、両者は圧縮機運転中においても常に
同圧の状態となる。このため、クランク室１と検
出装置本体２の潤滑油６のレベルは常に同一レベ
ルとなり、装置の誤作動が防止される。 FIG. 1 is a sectional view of a main part of a lubricating oil detection device for a splash-lubricated compressor according to this invention, and the same components as those in the conventional FIG. 2 are given the same reference numerals. In the figure, 1 is the crank chamber of the compressor, 1
a is the boss part, 2 is the level detection device main body, 2a
3 is the communication hole, 3 is the mounting part, 3a is the communication hole,
4 is a sealing member, 5 is a fixing bolt, 6 is a lubricating oil, 7 is a float, 8 is an oil scraper, and 10 is a substantially cylinder integrally provided with the mounting portion 3 fixed by bolts 11. The shielding plate has a shape of a shape, and has a communicating hole 10a with the crank chamber 1, and an open end 10b thereof is formed in a stepped portion 10c projecting outward at the side end.
The stepped portion 10c is positioned inside the inner wall surface of the crank chamber 1 when installed. Next, the operation will be explained. As in the conventional case, when the compressor is operated and the crankshaft (not shown) rotates, the lubricating oil 6 is scraped up by the oil scraper blade 8 attached to the lower part of the connecting rod 9 and splashes are generated. Splashes of lubricating oil 6 are supplied to each sliding part within the crank chamber 1. At that time, an oil film is formed by the scraped up lubricating oil 6, and this oil film is
As shown in the figure, the shielding plate 10 hangs down from the inner wall surface of the crank chamber 1 and closes the communication hole between the crank chamber 1 and the main body of the level detection device, such as the float chamber, to form a sealed chamber. Therefore, the oil film hanging down from the inner wall surface of the crank chamber 1 is caught by the outer periphery of the shielding plate 10.
It does not form a closed chamber. That is, the shielding plate 10
A stepped portion 10c is formed in the communicating hole 1.
Since the side end with the open end 10b of 0a protrudes outward, the oil film flowing down from the inner wall surface in the crank chamber 1 flows down from the outer periphery without exceeding the step 10c of the shielding plate 10. The opening end 10b of the hole 10a is not closed. Therefore, no pressure difference occurs between the internal pressure of the crank chamber 1 and the internal pressure of the level detection device main body 2, and both are always at the same pressure even during the operation of the compressor. Therefore, the level of the lubricating oil 6 in the crank chamber 1 and the detection device main body 2 are always at the same level, and malfunction of the device is prevented.
このように、段部１０ｃを有した遮蔽板１０を
設け、又空気通路となる連通孔１０ａの開口端１
０ｂを潤滑油６の飛沫が直接当らない上記段部１
０ｃの外周面に設けているので、確実に密閉室が
形成されるのを簡易な構成で防止することができ
る。 In this way, the shielding plate 10 having the stepped portion 10c is provided, and the opening end 1 of the communication hole 10a which becomes an air passage is provided.
0b is not directly hit by the droplets of the lubricating oil 6.
Since it is provided on the outer peripheral surface of 0c, it is possible to reliably prevent the formation of a sealed chamber with a simple configuration.
なお、連通孔１０ａの開口端１０ｂの位置は、
潤滑油６の飛沫が直接当らない側面であればどこ
でも良く、又このレベル検出装置本体は従来のオ
イルゲージの取付部に簡単に取り付けることが可
能である。 Note that the position of the opening end 10b of the communication hole 10a is as follows:
Any side surface may be used as long as it is not directly hit by splashes of lubricating oil 6, and the main body of this level detection device can be easily attached to a conventional oil gauge attachment part.
以上説明したように、この考案によれば、潤滑
油が貯溜された圧縮機のクランク室との連通孔を
有し且つその開口端が側端部で外側に突出した段
部を有した遮蔽板を設け、この遮蔽板の段部がク
ランク室の内壁面より内側にくるように配設した
ため、潤滑油の油膜がクランク室の内壁面から垂
れ下がつて密閉室を形成するのを確実に防止する
ことができ、従つて簡易な構成でクランク室内と
検出装置本体内の圧力を常に同一にすることがで
き、装置の誤作動を確実に防止することができる
という効果がある。
As explained above, according to this invention, the shielding plate has a communicating hole with the crank chamber of the compressor in which lubricating oil is stored, and the opening end of the shielding plate has a stepped portion protruding outward at the side end. The stepped part of this shielding plate is placed inside the inner wall of the crank chamber, which reliably prevents the lubricating oil film from hanging down from the inner wall of the crank chamber and forming a sealed chamber. Therefore, the pressure inside the crank chamber and inside the main body of the detection device can always be made the same with a simple configuration, and malfunction of the device can be reliably prevented.
尚、本案は、レベル検出手段としてフロートを
例にとつたが、他のレベル検出手段、例えば電極
棒検出においても同様の効果が生じる。 Although the present invention uses a float as an example of the level detection means, the same effect can be obtained with other level detection means, such as electrode rod detection.
第１図はこの考案の一実施例を示す一部断面
図、第２図は従来例を示す一部断面図、第３図
ａ，ｂ，ｃは従来の装置の動作を説明するための
一部断面図である。
１……クランク室、２……レベル検出装置本
体、２ａ……連通孔、３……取付部、３ａ……連
通孔、６……潤滑油、１０……遮蔽板、１０ａ…
…連通孔、１０ｂ……開口端、１０ｃ……段部。
Fig. 1 is a partial cross-sectional view showing an embodiment of this invention, Fig. 2 is a partial cross-sectional view showing a conventional example, and Fig. 3 a, b, and c are diagrams for explaining the operation of the conventional device. FIG. DESCRIPTION OF SYMBOLS 1... Crank chamber, 2... Level detection device main body, 2a... Communication hole, 3... Mounting part, 3a... Communication hole, 6... Lubricating oil, 10... Shielding plate, 10a...
...Communication hole, 10b...opening end, 10c...stepped portion.
Claims (1)
し、その潤滑油のレベルを検出して警報等を行う
レベル検出装置本体を前記クランク室の外壁面に
直接とりつけてなる飛沫給油式圧縮機の潤滑油検
出装置において、内部にクランク室とレベル検出
装置本体との連通孔を有した遮蔽板を設け、且つ
そのクランク室側の側端部に外側に突出した段部
を形成し、該段部に前記連通孔の開口端を設ける
と共に、該段部が前記クランク室の内壁面より内
側にくるように配設したことを特徴とする飛沫給
油式圧縮機の潤滑油検出装置。 A droplet oil-fed compressor, in which a level detection device that communicates with the crank chamber of the compressor in which lubricating oil is stored, detects the level of the lubricating oil, and issues an alarm, etc., is attached directly to the outer wall of the crank chamber. In the lubricating oil detection device, a shielding plate having a communication hole between the crank chamber and the level detection device main body is provided therein, and a step portion protruding outward is formed at the side end on the crank chamber side, and the step portion A lubricating oil detection device for a splash-lubricated compressor, characterized in that an open end of the communicating hole is provided at the opening end of the communicating hole, and the stepped portion is located inside the inner wall surface of the crank chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986076912U JPH0335897Y2 (en) | 1986-05-23 | 1986-05-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986076912U JPH0335897Y2 (en) | 1986-05-23 | 1986-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62188568U JPS62188568U (en) | 1987-12-01 |
| JPH0335897Y2 true JPH0335897Y2 (en) | 1991-07-30 |
Family
ID=30924427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986076912U Expired JPH0335897Y2 (en) | 1986-05-23 | 1986-05-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0335897Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9475559B2 (en) | 2013-07-03 | 2016-10-25 | Hobie Cat Company | Foot operated propulsion system for watercraft |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5343525U (en) * | 1976-09-20 | 1978-04-14 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52114409U (en) * | 1976-02-27 | 1977-08-31 |
-
1986
- 1986-05-23 JP JP1986076912U patent/JPH0335897Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5343525U (en) * | 1976-09-20 | 1978-04-14 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9475559B2 (en) | 2013-07-03 | 2016-10-25 | Hobie Cat Company | Foot operated propulsion system for watercraft |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62188568U (en) | 1987-12-01 |
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