Patent ID: 9149409
Filing Date: 2015-10-06
Classification: A61H

Abstract:
1. A back kneading device mounted in a backrest against which a user is able to lean his/her back, comprising: a massage mechanism including a pair of opposed right-hand and left-hand massage members each having a treatment element for providing a massage and a driving section for transmitting a massage action to the massage members; a base member for supporting said massage mechanism, with said massage member pointing forward; a vertical movement mechanism for allowing said base member to move up and down in a vertical direction inside said backrest; and a protruding amount varying mechanism for moving said massage member so that an amount of protruding movement of said treatment element in a front-rear direction can be varied; wherein the driving section of said massage mechanism includes a kneading driving portion for driving said massage members in such a manner that said opposed treatment elements move closer to and away from each other in a horizontal direction to produce a kneading massage action, and a tapping driving portion for driving said massage member in such a manner that said treatment element is moved reciprocally in the front-rear direction or vertical direction by repetitive axial rocking motions of the base part of said massage member to produce a tapping massage action; wherein said protruding amount varying mechanism is configured to vary the amount of protruding movement of said treatment element in the front-rear direction by moving said tapping driving portion in the vertical direction while imparting axial rocking motion to a base part of said massage member; wherein said protruding amount varying mechanism includes: wherein said protruding amount varying mechanism comprises: wherein an upper edge of the slot formed in said guide body serves as the first restraint part, a lower edge of the slot serves as the second restraint part, and a midportion of the slot in the vertical direction serves as the non-restraint part.