Oil hydraulic cylinder

An oil hydraulic cylinder comprising a cap part, a body part, and a base part,

• wherein the cap part comprises:
• a stopper-shaped cap;
• a rectangular support part fixedly formed on an upper surface of the cap;
• an operation hole formed at an upper surface of the support part;
• a rectangular hitching groove defined at one side of the operation hole;
• a hitching piece fixedly inserted into the hitching groove;
• hinge rod fixedly mounted at each distal end portion of the support part;
• an adjusting hole formed at an upper surface of the cap;
• a compression hole;
• coupling holes, each facing the other;
• and an adjusting part formed at a circumferential side of the cap defined with the adjusting hole;
• wherein the body part comprises:
• a body case;
• a compression rod mounted with a fixation ring thereunder for being inserted into a compression hole of the cap;
• a first piston formed thereon with a plurality of O-rings and a fixation washer for being mounted under the compression rod and formed with an O-ring thereunder;
• a first cylinder inserted by the first piston and formed with a threaded part at a lower circumference thereof;
• a resilience member inserted into a circumferential side of the first cylinder and hitched at one side thereof by the fixation washer of the first piston;
• a stopper formed with an opening;
• a second cylinder coupled via the stopper and a threaded part;
• a resilience member inserted into the second cylinder;
• a first piston pad fixedly inserted into the second cylinder for pressing the resilience member;
• an operation rod formed at one side thereof with a length of cut-out surface for insertion into the operation hole of the cap and formed thereunder with a second piston pad defined with a plurality of O-rings;
• a third cylinder formed thereon with a cut-out part for insertion of the operation rod;
• an adjusting rod formed at a mid-upper section thereof with a hitching groove for being inserted into the adjusting hole of the cap and fixedly mounted at a mid-section thereof with a fixation ring;
• a control rod fixedly mounted thereon with a fixation ring for being mounted under the adjusting rod and formed thereunder with a second adjusting groove and a first adjusting groove each spaced out at a distance;
• a resilience member inserted via the fixation ring of the control rod and a washer;
• and a coupling part where the control rod is fixedly coupled thereunder to an insertion hole;
• and
• wherein the base part comprises:
• a round body;
• a horizontal part protrusively formed at an upper side of the round body;
• a first groove part threadedly coupled by the first cylinder;
• a second groove part threadely coupled by the second cylinder;
• a third groove part fixedly inserted by the coupling part;
• a fourth groove part mounted with the third cylinder;
• a first check valve protrusively formed at one lateral surface of the first groove part;
• a first passage formed between the first groove part and the first check valve;
• a second passage formed between the first groove part and the second groove part;
• a second check valve formed inside the second passage;
• an oil control mechanism formed between a third passage formed between the second groove part and the third groove part and a fourth passage;
• and a fifth passage formed between the third groove part and a fourth groove part.