Hammer-headed tenon
Encyclopedia
Hammer-headed tenon joints are one method that can be used to join curved members of joinery
components.
The hammer-headed tenon is used to join a curved member to a straight member such as a curved head member to a jamb. The tenon
is formed on the jamb and the mortise to receive the tenon is formed on the curved member. The mortise is increased in size to receive a pair of folding wedges each side of the tenon.
The hammer-headed key is used where there is no straight member to form the tenon. It is difficult to form a strong tenon on curved cut timber as the short grain
there will weaken it, so two mortise sockets are formed one in each piece and a separate tenon piece called a key is formed to fit. As with the hammer-headed tenon the mortise sockets are increased in size to allow for the folding wedges each side of the tenon.
When the joint is fitted and glued together it is the folding wedges that give the cramping
effect that tightens the shoulder of the joint.
Both these hammer-headed joints need good attention to detail from the joiner
as they are difficult to make completely by machine or power tool.
Other joints that can be used on curved headed frames are:
Draw dowelled bridle or mortise
Handrail bolts and dowels
Woodworking joints
Joinery is a part of woodworking that involves joining together pieces of wood, to create furniture, structures, toys, and other items. Some wood joints employ fasteners, bindings, or adhesives, while others use only wood elements. The characteristics of wooden joints - strength, flexibility,...
components.
The hammer-headed tenon is used to join a curved member to a straight member such as a curved head member to a jamb. The tenon
Mortise and tenon
The mortise and tenon joint has been used for thousands of years by woodworkers around the world to join pieces of wood, mainly when the adjoining pieces connect at an angle of 90°. In its basic form it is both simple and strong. Although there are many joint variations, the basic mortise and tenon...
is formed on the jamb and the mortise to receive the tenon is formed on the curved member. The mortise is increased in size to receive a pair of folding wedges each side of the tenon.
The hammer-headed key is used where there is no straight member to form the tenon. It is difficult to form a strong tenon on curved cut timber as the short grain
Wood grain
In speaking of wood the term grain refers to the alternating regions of relatively darker and lighter wood resulting from the differing growth parameters occurring in different seasons . The term is used in several ways. Perhaps most important is that in woodworking techniques...
there will weaken it, so two mortise sockets are formed one in each piece and a separate tenon piece called a key is formed to fit. As with the hammer-headed tenon the mortise sockets are increased in size to allow for the folding wedges each side of the tenon.
When the joint is fitted and glued together it is the folding wedges that give the cramping
Clamp (tool)
A clamp is a fastening device to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure...
effect that tightens the shoulder of the joint.
Both these hammer-headed joints need good attention to detail from the joiner
Joiner
A joiner differs from a carpenter in that joiners cut and fit joints in wood that do not use nails. Joiners usually work in a workshop since the formation of various joints generally requires non-portable machinery. A carpenter normally works on site...
as they are difficult to make completely by machine or power tool.
Other joints that can be used on curved headed frames are:
Draw dowelled bridle or mortise
Handrail bolts and dowels