kanawatsugi 金輪継
KEY WORD : architecture / joints
An oblique, housed (dadoed), rabbeted, T-shaped, half-blind, tenoned scarf joint. Because both the tenon and mortise are blind, the joint cannot be slipped together from the side, as in an oblique, housed, rabbeted, scarf joint *okkake daisentsugi 追掛大栓継. The oblique surface on the mortised half of the indented part is decreased by the depth of the rabbet. Therefore, the end with the inverted T-tenon on the corresponding piece must be inserted in a lengthwise direction. Then a joining draw pin komisen 込栓 (see *sen 栓) is driven through the opening provided in the center to lock the joints. Sometimes two keys *shachi 車知 are used in place of a draw pin to strengthen the joint. This joint is commonly used in foundation footings *dodai 土台, wall plates *daiwa 台輪, the beam used for the bottom tracks for sliding doors or window *shikigeta 敷桁, and in eave purlins *dashigeta 出桁. The improvement in carpenter's tools in the Edo period made it possible to fashion complex joints such as this.

a) komisen 込栓


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