Projection-type linear actuator

A protruding type linear actuator, comprising:

• a pair of wound portions arranged to face each other;
• a pair of elongated plates wound spirally around the pair of wound portions, respectively;
• a drive roller configured to abut against one surface of the pair of elongated plates to move the pair of elongated plates along a longitudinal direction of the elongated plates, the pair of elongated plates extending respectively from the pair of wound portions and being overlapped with each other;
• a rotatable roller disposed to face the drive roller and configured to sandwich the pair of overlapped elongated plates between the drive roller and the rotatable roller;
• and
• a housing configured to accommodate the pair of wound portions, the drive roller, and the rotatable roller, wherein
• the elongated plates are pulled out from the pair of wound portions or wound around the pair of wound portions, causing the pair of elongated plates protruding from an opening of the housing to reciprocate linearly outside the housing.

A protruding type linear actuator, comprising:

• a pair of wound portions arranged to face each other, around which elongated plates are respectively wound spirally;
• a housing configured to accommodate the pair of wound portions therein, bring the elongated plates into contact with each other such that the elongated plates extending respectively from the pair of wound portions are overlapped with each other, and cause overlapped free end portions of the pair of elongated plates to protrude to the outside from an opening;
• a drive roller accommodated in the housing and configured to abut against one surface of the pair of overlapped elongated plates to move the pair of elongated plates along a longitudinal direction of the elongated plates;
• and
• a rotatable roller accommodated in the housing, disposed to face the drive roller, and configured to sandwich the pair of overlapped elongated plates between the drive roller and the rotatable roller, wherein
• the housing includes
• a housing body including a pair of wound portion accommodation recesses configured to respectively accommodate the pair of wound portions, and a roller accommodation recess configured to accommodate the drive roller and the rotatable roller, and
• a lid portion configured to be detachably fixed to a body-side installation surface of the housing body in which the pair of wound portion accommodation recesses and the roller accommodation recess are formed, and to be integrated with the housing body to cover the pair of wound portions respectively accommodated in the pair of wound portion accommodation recesses, and the drive roller and the rotatable roller accommodated in the roller accommodation recess, and
• the elongated plates are pulled out from the pair of wound portions or wound around the pair of wound portions, causing the pair of elongated plates protruding from the opening of the housing to reciprocate linearly outside the housing.

A protruding type linear actuator, comprising:

• a pair of wound portions each including a gear portion formed on an outer periphery thereof and arranged to face each other such that the gear portions are engaged with each other;
• a pair of elongated plates wound spirally around the pair of wound portions, respectively;
• a drive gear roller configured to engage with the gear portion of at least one of the pair of wound portions to rotate the pair of wound portions;
• and
• a housing configured to accommodate the pair of wound portions and the drive gear roller, wherein
• in a state where the elongated plates extending respectively from the pair of wound portions are overlapped with each other, the elongated plates are pulled out from the pair of wound portions or wound around the pair of wound portions, causing the pair of elongated plates protruding from an opening of the housing to reciprocate linearly outside the housing.