US 2010/0282368 A1Published application

Mortise and Tenon Joinery of Log Members

OwnerTyler Bragnaloinventor

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Abstract

A method of joining a plurality of elongate log members using mortise and tenon joinery comprises forming mortise sockets in the log members at a controllable depth relative to a longitudinal central axis of the log members. Log members having tenons formed thereon for connection between two mortise bearing log members can thus be standardized and interchangeable with one another even when an outer surface of the log members is irregular in profile. A device for forming mortise sockets and tenons on log members in a reproducible manner comprises a pair of work holders which define a longitudinal axis of the log member. A mortise cutter and a tenon cutter are supported for movement relative to the work holders for controllably forming the mortise sockets and tenons in a log member relative to the longitudinal central axis of the log member.

Claims20

Dependent claims

A method of joining a plurality of elongate log members using mortise and tenon joinery, the method comprising:

selecting a first log member to comprise a mortise bearing member;
locating a longitudinal axis of the first log member extending centrally through the first log member in a longitudinal direction along a length of the first log member;
selecting a second log member to comprise a tenon bearing member;
locating a longitudinal axis of the second log member extending centrally through the second log member in a longitudinal direction along a length of the second log member;
forming a tenon at one end of the second log member comprising a first mating surface of reduced diameter which is coaxial with the longitudinal axis of the second log member;
measuring a selected distance in an axial direction between the first mating surface and the longitudinal axis of the first log member;
forming a mortise socket in the first log member comprising a second mating surface in which the mortise socket is arranged to matingly receive the tenon therein such that the first and second mating surfaces are abutted with one another;
wherein the mortise socket is formed to have a depth relative to an outer surface of the first log member such that the second mating surface is located at said selected distance from the longitudinal axis of the first log member when the first and second mating surface are abutted with one another.

5 more elements

A device for forming mortise sockets in a log member having an irregular profile, the device comprising:

a frame;
a pair of work holders supported on the frame at spaced apart positions so as to be arranged to engage opposing ends of the log member, the pair of work holders defining a longitudinal axis of the log member along a central axis extending between the pair of work holders;
a rotatable mortise cutter arranged to form a mortise socket in the log member;
the mortise cutter being rotatably supported on the frame for movement in a radial direction relative to the central axis extending between the pair of work holders;
and
a controller arranged to displace the mortise cutter at a controllable distance relative to the central axis so as to be arranged to form the mortise socket in the log member at a controllable depth relative to the central axis of the log member.

3 more elements

A device for forming a tenon on a log member having an irregular profile, the device comprising:

a frame;
a pair of work holders supported on the frame at spaced apart positions so as to be arranged to engage opposing ends of the log member, the pair of work holders defining a longitudinal axis of the log member along a central axis extending between the pair of work holders;
at least one of the work holders comprising:
a central spindle arranged to engage the respective end of the log member at the central axis of the work holders in fixed relation to the log member;
a tenon cutter surrounding the central spindle including at least one cutting blade for forming a tenon;
the central spindle and the tenon cutter being supported for rotation relative to one another about the central axis of the work holders so as to be arranged for rotation of the tenon cutter relative to the log member;
and
the tenon cutter being slidable along the central axis relative to the central spindle between a starting position in which the central spindle projects axially towards the opposing work holder beyond the tenon cutter and an ending position in which the tenon cutter projects axially towards the opposing work holder beyond the central spindle so as to surround an end of the log member.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/773,435Filed 4 May 2010
Priority: CA 26646085 May 2009
Published: 11 Nov 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B27M 3/28
Manufacture or reconditioning of specific semi-finished or finished articles: of dowels or bolts
B27F 1/10
Making dovetails, tongues, or tenons, of definite limited length: cutting tenons of round or rounded- off profile
B27F 5/02
Slotted or mortised work: slotting or mortising machines tools therefor
B27M 3/12
Manufacture or reconditioning of specific semi-finished or finished articles: of railings, stairs, stair stringers, ladders, or parts thereof