Hydraulic automatically ascending apparatus with a volume-variable oil tank

A hydraulic automatically ascending apparatus comprising:

• a hydraulic cylinder including a piston, and a piston rod which extends upwardly from said piston to connect with an article,
• an oil tank, said tank being made of a material capable of being deformed so that it has a variable volume,
• an elastomeric body mounted outwardly of said tank for biasing said oil tank to retract,
• means for mounting said elastomeric body, and
• oil passage means including an oil pipe for intercommunicating with said hydraulic cylinder and said tank and connecting block measns between said hydraulic cylinder and said oil tank, said oil pipe being inserted through said connecting block means,
• said oil tank being shaped like a circular barrel having an open end and a closed end,
• said mounting means including (a) a first circular flange projecting from said connecting block, (b) means defining therein a first circular bore for receiving said open end of said oil tank, and (c) a support formed with a second circular flange projecting toward said first circular flange for defining therein a second circular bore for receiving said closed end of said oil tank,
• said elastomeric body comprising a tension spring interconnecting securely said first and second circular flanges for biasing said first circular flange to move toward said second circular flange while permitting said flanges always to be spaced from each other.