WO2019245231A1 - Dispositif de sécurité pour sarcleuse - Google Patents

Dispositif de sécurité pour sarcleuse Download PDF

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Publication number
WO2019245231A1
WO2019245231A1 PCT/KR2019/007139 KR2019007139W WO2019245231A1 WO 2019245231 A1 WO2019245231 A1 WO 2019245231A1 KR 2019007139 W KR2019007139 W KR 2019007139W WO 2019245231 A1 WO2019245231 A1 WO 2019245231A1
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WO
WIPO (PCT)
Prior art keywords
inner cylinder
tiller
safety device
pressure
cylinder
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.)
Ceased
Application number
PCT/KR2019/007139
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English (en)
Korean (ko)
Inventor
박기혁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from KR1020190069885A external-priority patent/KR102368548B1/ko
Publication of WO2019245231A1 publication Critical patent/WO2019245231A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B15/00—Elements, tools, or details of ploughs
    • A01B15/20—Special adjusting means for tools of ploughs drawn by, or mounted on tractors working on hillsides or slopes
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B3/00—Ploughs with fixed plough-shares
    • A01B3/24—Tractor-drawn ploughs

Definitions

  • the present invention relates to a safety device of a tiller, in particular, when a tiller such as a tractor plow, a plow, a plough, a plow, a subsoil crusher cultivates the arable land, due to obstacles such as stones or rocks, the impact is relieved.
  • the present invention relates to a safety device of a tiller, which can be manufactured by a very simple structure by preventing damage and improving work efficiency.
  • the plow is used to cultivate the soil using a livestock such as a horse or a machine for the purpose of growing crops, and to turn over and turn over.
  • Conventional tractor plow device consists of a multiple plow device having a plurality of plows according to the size or horsepower of the tractor.
  • a tractor plow is provided with a plurality of plow parts up to three to eight, each plow is installed in the main frame zigzag with respect to the main frame or diagonally in the towing direction.
  • the plow unit When the plow operation is performed during the operation of the conventional tractor plow device, an unexpected situation may occur in which the plow part collides with the rock embedded in the soil. Accordingly, when the plow unit is simply fixed to the main frame, the plow unit may be damaged or deformed by receiving the impact force due to the rock as it is, thereby destroying the shape of the ridge or causing a failure of the entire apparatus.
  • Korean Patent No. 10-1623386 registered by the present applicant has proposed a safety device for a tiller, which is provided with a tractor connection part which is connected to a tractor towed forward as shown in FIG.
  • a safety device of a cultivator comprising a main frame, a cultivation unit rotatably installed on the main frame in the vertical direction to cultivate land, and a drive cylinder for elastically supporting rotation of the cultivation unit from the main frame,
  • the drive cylinder is a body in which a rod formed with a pressure plate in the front end is inserted;
  • first hydraulic hole is located at the rear portion of the pressure plate when the rod is extended from the body, and the second hydraulic hole is respectively positioned at the front portion of the pressure plate when the rod is compressed.
  • the mainframe 100 is provided with a tractor connecting portion to be connected to the tractor to the front.
  • the cultivation unit 200 that is, the plow unit 200 serves to substantially plow work, that is, digging and turning over the soil, is installed in the main frame 100.
  • the plow unit 200 is installed in the main frame 100 so as to be rotatable vertically, and is composed of moisturizing and crests.
  • the drive cylinder 300 is installed to correspond to the plow unit 200 1: 1, such a drive cylinder 300 is a hydraulic cylinder using the hydraulic pressure, the linear reciprocating motion in conjunction with this during the vertical rotation of the plow unit 200 It is a double acting cylinder.
  • the end of the rod 311 of the cylinder 300 is coupled to be rotatable by the rotary coupling portion 210 on the upper side of the plow portion 200, the rear end of the cylinder 300 is main by the coupling portion 110 It is coupled to the frame 100 to be rotatable.
  • the driving cylinder 300 has a rod 356 coupled to one side of the cylinder body 351, and a pressing plate 357 is formed at the front end of the rod 356, and the rear end of the driving cylinder 300.
  • Pin assembly portion 353 for coupling to the rotary coupling portion 210 is formed.
  • a first hydraulic hole 354 is formed at one side of the rod 356 of the body 351, and the first hydraulic hole 354 is the rear side of the pressure plate 357 when the rod 356 is extended. It is located above.
  • a second hydraulic hole 352 is formed at the other side of the body 351, and a hydraulic line 353 in the form of a metal tube is connected between the first hydraulic hole 354 and the second hydraulic hole 352.
  • the rod 356 is extended by the pressure applied to the front portion of the pressure plate 357, so that the plow 200 returns to its original position, and at the same time, the pressure plate 357 The hydraulic pressure of) flows into the second inlet hole 352 through the hydraulic line 353.
  • the pressure acting on the front portion of the pressure plate 357 is greater than the pressure acting on the rear portion, so that the plowing unit 200 is not easily lifted, so that the ground It is cultivated evenly.
  • this conventional technique is that the rod 356 is compressed when the plow unit 200 rotates upward by the obstacle, the hydraulic pressure of the front portion of the pressure plate 357 is increased, the rod 356 by the obstacle If the pressure is continuously compressed, the pressure in the front part of the pressure plate 357 increases rapidly, causing the cylinder body 351 not to hold the pressure, causing it to burst, damage of the rod 356, or breakage at the welded part. .
  • the pressure of the front portion of the pressure plate 357 exceeds the critical point, and the cylinder body 351, the rod 356, the welded portion, etc. are damaged by the pressure.
  • the hydraulic line 353 is exposed to the outside of the cylinder 300 to move the hydraulic pressure to the front and rear of the pressure plate 357, so that the hydraulic line 353 is easily damaged by external shock or other work tools. Or breakage may occur, and as a result, the tillage work is interrupted, resulting in a great loss of time and cost, and thus, a decrease in work efficiency.
  • the present invention is to solve the above problems, when the pressure of the front end of the pressure plate when the rod is compressed, the safety device of the tiller to prevent the breakage of the cylinder by preventing the pressure increase any more even if the rod continues.
  • the purpose is to provide.
  • a main frame having a tractor connecting portion connected to the tractor and towed at the front, a cultivating part rotatably installed in the main frame in a vertical direction to cultivate land, and a cylinder for elastically supporting rotation of the cultivating part from the main frame.
  • a tractor connecting portion connected to the tractor and towed at the front
  • a cultivating part rotatably installed in the main frame in a vertical direction to cultivate land
  • a cylinder for elastically supporting rotation of the cultivating part from the main frame.
  • An inner cylinder inserted into one side of the body and formed to be shorter than a movement distance of the pressure plate formed at the rod end;
  • V packing is mounted along the outer periphery of the pressure plate
  • the pressure plate is characterized in that the outer diameter is configured to have a size that is inserted into the inner cylinder.
  • the rod of the cylinder is compressed by an obstacle, and when the pressure of the cylinder reaches the set value due to excessive compression of the rod, there is an effect of preventing damage to the cylinder by preventing further increase in pressure.
  • the hydraulic line exposed to the outside of the cylinder is removed to protect the hydraulic movement path of the cylinder, and the cylinder body is also protected by the outer jacket has the advantage that no direct damage and damage does not occur.
  • FIG. 1 is a view showing an example of a tiller to which the prior art is applied.
  • FIG. 2 shows the structure of the safety device of the tiller according to the prior art.
  • Figure 3 is a view showing the structure of the safety device of the tiller according to the first embodiment of the present invention.
  • Figure 4 shows a second embodiment of the present invention.
  • Figure 5 is a view showing the structure of the inner cylinder according to the second embodiment.
  • FIG. 6 is a view for explaining a state in which an elastic body is installed in the inner cylinder to elastically support the stopper according to the second embodiment
  • Figure 7 shows a third embodiment of the present invention.
  • FIG. 8 is a view showing another form of the opening and closing portion.
  • FIG. 9 is a view showing a fourth embodiment of the present invention.
  • Figure 11 is a view showing a graph comparing the pressure change inside the cylinder body by the operation of the prior art and the second and third embodiments of the present invention.
  • Best mode for carrying out the invention is a main frame having a tractor connecting portion to be connected to the tractor in front of the tractor, a cultivating unit is rotatably installed in the main frame to cultivate land, and the cultivating unit In the safety device of a tiller consisting of a cylinder for elastically supporting rotation from the frame,
  • An inner cylinder inserted into one side of the body and formed to be shorter than a movement distance of the pressure plate formed at the rod end;
  • V packing is mounted along the outer periphery of the pressure plate
  • the pressure plate is characterized in that the outer diameter is configured to have a size that is inserted into the inner cylinder.
  • Figure 3 is a view showing the structure of the safety device of the tiller according to the first embodiment of the present invention, one side portion, that is, the inside of the body 400 from the front portion where the rod 410 is inserted into the cylinder body 400
  • the inner cylinder 403 is inserted into the rear portion.
  • the rod support portion 401 for supporting the rod 410 while pulling the inner portion of the body 400 and hermetically sealing the body 400 is connected to one side of the body 400. Screwed by the 402 is fastened, the front portion of the rod support 401 is provided with an internal cylinder 403 is inserted into the body 400 is integrally provided.
  • the inner cylinder 403 is formed such that its outer diameter is the same as the inner diameter of the body 400, the length is the rod 410 against the initial pressure applied when the cultivation portion 200 mentioned in FIG. As it is compressed, the cylinder body 400 preferably corresponds to the moving distance of the rod 410 that can withstand its initial pressure.
  • the inner cylinder 403 has a length corresponding to the moving distance of the rod 410 so that the tilling part 200 can no longer be lifted by the pressure formed in the part so as to completely dig and till the ground. will be.
  • the length of the inner cylinder 403 is long enough to form a pressure value immediately before the pressure (that is, initial pressure) threshold (maximum initial pressure) that can be held by the body 400 by the movement of the pressure plate 411. Becomes, and is formed shorter than the moving distance of the pressure plate 411.
  • the pin assembly 413 is formed outside the rear end of the cylinder body 400 to be coupled to the main frame 100 by pin coupling to the coupling unit 110 formed on the main frame 100.
  • the pressure plate 411 has a length that the outer diameter is inserted into the inner cylinder 403, the outer periphery of the packing mounting groove 411-1 is formed in the packing mounting groove 411-1
  • the V packing 411-2 is mounted.
  • the V-packing 411-2 is in the form of a ring, and its cross section is mounted to have a V-shape toward the rear of the body 400, and the outer surface of the V-packing 411-2 is the inner cylinder 403. It is in airtight contact with the inside diameter of
  • the inner diameter of the cylinder body 400 is formed larger than the inner diameter of the inner cylinder 403, and the tip of the inner cylinder 403 has an inclined portion 404 inclined toward the inner side of the inner cylinder 403. Formed.
  • the cultivation unit 200 When the cultivation unit 200 digs the ground, the cultivation unit 200 should be able to cultivate easily by digging the ground only when a sufficient support force for the initial pressure is formed, wherein the cylinder body 400 is used for the initial pressure. Bracing force should be provided to the tilling unit 200.
  • the tiller 200 is rotated upward by the resistance of the ground when the initial pressure is generated, the rod 410 is compressed so that the pressure plate 411 is moved to the rear of the body 400, the solid line of Figure 11 As shown in the graph, the pressure inside the body 400 at the front portion of the pressure plate 411 is increased momentarily.
  • V-packing 411-2 is pressurized while being unfolded by the rearward movement of the pressure plate 411.
  • the pressure plate 411 repeats the forward and backward only in the inner cylinder 403, so that the pressure inside the body 400 is for the tillage of the tiller 200.
  • the pressure does not increase so much that the body 400 is damaged only to provide the support force.
  • the cultivation unit 200 when the cultivation unit 200 is caught by obstacles such as rocks during the cultivation operation, the cultivation unit 200 is rotated to the upper side, thereby increasing the compression length of the rod 410.
  • the pressure plate 411 is also moved backward by the compression of the rod 410 so that the pressure inside the body 400 is instantaneously increased by an 'A' section than the maximum initial pressure as shown in FIG. 11, but the body 400 is The pressure plate 411 immediately before the endurable pressure leaves the inner cylinder 403, and the pressure inside the body 400 is rapidly lowered.
  • the hydraulic pressure flows into the space between the outer diameter of the pressure plate 403 and the inner diameter of the body 400, so that the hydraulic pressure of the inner side of the inner cylinder 403 and the body 400 is increased.
  • the pressure inside the body 400 is reduced while being shared with each other, and thus, the brace force is lost in the tilling part 200, thereby easily rotating upwards, and thus the tilling part 200 is avoided by riding over obstacles. .
  • the pressure plate 403 advances at the time of obstacle avoidance, the pressure inside the body 400 increases to the maximum initial pressure, but thereafter, the tiller 200 is lowered again while avoiding the obstacle, thereby causing the rod 410. As the elongation of the pressure plate 411 is reversed, the pressure inside the body 400 is lowered.
  • the pressure that damages the body 400 does not occur even when the cultivation unit 200 digs the ground and additional pressure due to obstacles.
  • Figure 4 is a second embodiment of the present invention, the same structure as the inner cylinder 403 is inserted into the interior of the body 400 as the first embodiment, but the hydraulic pressure is shared in front and rear of the pressure plate 411 The structure is different.
  • the outer diameter of the inner cylinder 403 is formed smaller than the inner diameter of the body 400, a space 417 is formed between the outer diameter of the inner cylinder 403 and the inner diameter of the body 400, the rod 410
  • the through-hole 414 is formed in the inner cylinder 403 to communicate the inner cylinder 403 and the space 417 at the rear portion of the pressure plate 411 in the state where the maximum extension is made.
  • the through hole 414 is provided with a valve 415, the valve 415 is elastically supported by an elastic body 416 that presses with an elastic force in the inner direction of the inner cylinder 403 in the form of a stopper. .
  • the elastic body 416 may be in the form of an elastic band wound along the outer periphery of the inner cylinder 403, as shown in Figure 5, and is inserted into the fixing groove 417 formed along the outer periphery of the inner cylinder 403 6 may be fixed and elastically supported by covering the upper side of the valve 415 as shown in FIG.
  • the elastic body 416 is given as an elastic band, but any structure capable of elastically supporting the stopper 415 is applicable.
  • a spring for example, a spring, a rubber band stainless band, or the like can be applied.
  • a packing 411-3 is mounted around the outer circumference of the pressure plate 411, and the packing 411-3 may use an O-ring, a V-packing, or the like.
  • the rod 410 when tilling the ground, the rod 410 is compressed by the resistance of the ground to advance the pressure plate 411, wherein the pressure of the front portion of the pressure plate 411 in the inner cylinder 403 is greater than the rear portion Therefore, the large pressure flows through the space 417 to maintain the valve 415 closed to block the through hole 414.
  • the initial pressure of the body 400 is increased momentarily until the pressure plate 411 moves forward to escape the inner cylinder 403, but the pressure plate 411 is the inner cylinder 403.
  • the pressure inside the body 400 is introduced into the inner cylinder 403 to share the hydraulic pressure to avoid obstacles.
  • valve 415 opens and closes the through hole 414 by the pressure of the inner cylinder 403 and the space 417, that is, the body 400, similarly to the operation of the check valve. .
  • FIG. 7 illustrates a third embodiment of the present invention, in which the inner cylinder 403 is inserted into the body 400 as in the second embodiment, but shares hydraulic pressure by pressurization of the rod 410. Only the structure for adjusting the opening and closing time of the through hole 414 is different.
  • the inner cylinder 403 is installed to extend beyond the moving distance of the pressure plate 411 from the inside of the body 400, the space portion 417 between the outer diameter of the inner cylinder 403 and the inner diameter of the body 400
  • a communication unit 418 is formed between the end of the inner cylinder 403 and the inner side of the body 400 so as to allow the inner side of the inner cylinder 403 to communicate with the space 417.
  • the communicating part 417 may have a length of the inner cylinder 403 slightly shorter than the inner side of the body 400 or may include a hole for hydraulic communication in the inner cylinder 403.
  • the opening and closing portion 420 is installed in the rear portion of the pressure plate 411, this opening and closing portion 420 is a pipe shape inserted into the rod 410 When the rod 410 is pressed, a protrusion 421 for opening the valve 415 is formed at a position where a threshold value of the initial pressure is formed inside the body 400.
  • the rod 410 is compressed and the pressure plate 411 is advanced, so that the initial pressure is applied to the front part of the pressure plate 411 more than the rear part.
  • the initial pressure is introduced through the space 417 to maintain the plug 415 is closed to block the through hole 414.
  • the pressure plate 411 is moved forward while the rod 410 is momentarily compressed so that the pressure at the front portion of the pressure plate 411 exceeds the initial pressure.
  • the hydraulic pressure is shared to the rear of the pressure plate 411 through the space portion 417 and the through-hole 414 by the protrusion 421 which is fixed to the ()) and pushes forward the valve 415 upward.
  • the distance D between the protrusion 421 and the valve 415 forms the pressure plate 411 for forming a critical pressure of the initial pressure. It should be equal to the distance of travel.
  • the distance D has a grain boundary value of the initial pressure due to the movement of the pressure plate 411. It is proportional to the distance that can be made.
  • the rod 410 is extended while the tiller 200 descends, and thus the pressure plate 411 moves backward, and the pressure at the rear portion of the pressure plate 411 is greater than the front portion.
  • the opening and closing part 420 also retreats together, and the protrusion 421 opens the valve 415 again to share the pressure with the front part of the pressure plate 411 to relieve the pressure of the rear part of the pressure plate 411.
  • valve 415 may also be performed by the pressure of the rear portion of the pressure plate 411.
  • FIG. 8 is a view showing another form of the opening and closing portion 420, and has a structure in which the protrusion 421 of the opening and closing portion 420 extends rearward, and its length is a position where the valve 415 is opened by the protrusion 421.
  • FIG. In the pressure plate 411 is formed longer than the maximum length to move.
  • the critical pressure of the initial pressure is formed at the front portion thereof, and at the same time, the protrusion 421 opens the valve 415.
  • the hydraulic pressure is shared in front and rear of the pressure plate 411 to release the initial pressure.
  • the pressure plate 411 is also continuously advanced to increase the pressure in the front part of the pressure plate 411, but the protrusion 421 Since the valve 415 is continuously opened, the pressures at the front and rear portions of the pressure plate 411 are shared with each other so that excessive pressure is eliminated.
  • FIG. 9 is a fourth embodiment of the present invention.
  • the basic structure is the same as that of FIG. 4, but a structure including an opening and closing part 420 is added to the rear of the pressure plate 411 as shown in FIG. 7.
  • This structure is such that when the pressure plate 411 is advanced and the critical pressure of the initial pressure formed before leaving the inner cylinder 403 is formed, the valve 415 is opened by the opening / closing portion 420 and the space portion 417 and the through hole 414 are formed. Hydraulic pressure is shared to the rear of the pressure plate 411 through.
  • the pressure plate 411 is further advanced to escape the inner cylinder 403, the pressure in front and rear of the pressure plate 411 is completely shared to solve the excessive pressure.
  • FIG. 10 is a structure of the opening and closing portion 420 shown in the fourth embodiment of the present invention is replaced by the structure of the opening and closing portion 420 shown in FIG. 8, and the opening and closing portion 420 when the critical pressure of the initial pressure occurs.
  • the excess pressure is released by maintaining the open state of the valve 415, and then the pressure plate 411 is released from the inner cylinder 403 by the additional pressure to completely eliminate the excessive pressure.
  • the present invention forms a holding force that the tiller 200 can dig into the ground by the pressure formed in the front portion of the pressure plate 411 in the initial pressure section when the tiller 200 digs the ground.
  • the large pressure formed in the front part of the pressure plate 411 may be solved by the rear part to protect the tiller 200.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Soil Working Implements (AREA)

Abstract

La présente invention concerne un dispositif de sécurité pour sarcleuses et, spécifiquement, un dispositif de sécurité pour sarcleuses, qui réduit l'impact lorsqu'une surcharge est provoquée par un obstacle tel qu'une pierre ou une roche durant le travail d'une terre agricole à l'aide d'une sarcleuse, telle qu'une charrue de tracteur, une charrue à fond double, une charrue à sillon, une billonneuse, et une décompactrice, afin d'empêcher les détériorations de la sarcleuse et améliorer l'efficacité du travail, et peut être fabriqué en utilisant une structure très simple. À cette fin, la présente invention fournit un dispositif de sécurité pour sarcleuse comprenant : un châssis principal comprenant une partie de liaison au tracteur prévue sur son côté avant pour être reliée à et tractée par un tracteur ; une partie sarcleuse installée verticalement de manière à pouvoir tourner sur le châssis principal pour sarcler le sol ; et un cylindre pour supporter élastiquement la partie sarcleuse tournant sur le châssis principal, le cylindre comprenant : un corps dans lequel une tige est insérée à travers son côté ; un cylindre interne qui est inséré dans le corps pour se trouver au niveau d'un côté du corps, est formé pour être plus petit que la plage de mouvements d'une plaque de compression formée à l'extrémité de la tige, et est formé pour avoir un diamètre externe inférieur au diamètre interne du corps pour former un espace entre eux ; un trou communiquant qui est formé à travers le cylindre interne pour permettre à l'espace et à l'intérieur du cylindre interne de communiquer l'un avec l'autre à travers ce dernier et est formé pour se trouver derrière la plaque de compression lorsque la tige est étendue de manière maximale ; une vanne d'ouverture/fermeture du trou communiquant ; et une partie d'ouverture/fermeture disposée derrière la plaque de compression pour ouvrir/fermer la vanne par des mouvements vers l'avant et vers l'arrière de la plaque de compression, la plaque de compression étant configurée pour présenter un diamètre externe permettant son insertion dans le cylindre interne.
PCT/KR2019/007139 2018-06-18 2019-06-13 Dispositif de sécurité pour sarcleuse Ceased WO2019245231A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2018-0069779 2018-06-18
KR20180069779 2018-06-18
KR1020190069885A KR102368548B1 (ko) 2018-06-18 2019-06-13 경작기의 안전장치
KR10-2019-0069885 2019-06-13

Publications (1)

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WO2019245231A1 true WO2019245231A1 (fr) 2019-12-26

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PCT/KR2019/007139 Ceased WO2019245231A1 (fr) 2018-06-18 2019-06-13 Dispositif de sécurité pour sarcleuse

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WO (1) WO2019245231A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5840474U (ja) * 1981-09-12 1983-03-17 日野自動車株式会社 自動車のティルト・キャブに使用される油圧シリンダ
WO1998023865A1 (fr) * 1996-11-26 1998-06-04 Pos-Line Ab Actionneur pneumatique a mouvement alternatif et procede de mise en oeuvre
JP2009287609A (ja) * 2008-05-27 2009-12-10 Hitachi Automotive Systems Ltd 流体圧緩衝器
US9169891B2 (en) * 2009-01-23 2015-10-27 Kayaba Industry Co., Ltd. Shock absorbing device
KR101623386B1 (ko) * 2015-11-19 2016-06-07 박기혁 경작기의 안전장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5840474U (ja) * 1981-09-12 1983-03-17 日野自動車株式会社 自動車のティルト・キャブに使用される油圧シリンダ
WO1998023865A1 (fr) * 1996-11-26 1998-06-04 Pos-Line Ab Actionneur pneumatique a mouvement alternatif et procede de mise en oeuvre
JP2009287609A (ja) * 2008-05-27 2009-12-10 Hitachi Automotive Systems Ltd 流体圧緩衝器
US9169891B2 (en) * 2009-01-23 2015-10-27 Kayaba Industry Co., Ltd. Shock absorbing device
KR101623386B1 (ko) * 2015-11-19 2016-06-07 박기혁 경작기의 안전장치

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