Most wooden scrubs have a very simple design. Some have horn front handles based on an old European design. The "rear grip" is simply the back of the stock or body.The design of wooden planers varies considerably in terms of handles and stock shape.However, the usual method of securing the blade (with a wooden wedge) and adjusting the blade (with a hammer or mallet) means that there are usually no screws or mechanisms to consider.
Drain
This is the main part of the aircraft, to which everything else is attached. It is made of solid wood which can be ash, beech, oak, hornbeam, maple or mahogany.
Sun
The sole is the part that slides over the surface of the workpiece during planing. It must be perfectly level. It is usually made from the same piece of wood as the body, but in some cases a separate piece of wood even harder than the body is used for added protection from damage.
Iron
Like the metal versions of the planer, the iron has a deep bulge or rounding so that the blade acts as a notch to remove a lot of excess wood. The iron is placed on the inside of the stock, usually at a 45 degree angle to the soleplate.
Wedge and wedge stops / clamping bar
The task of the wedge is to securely hold the iron in place. It is usually found behind a pair of stops embedded in the stock.However, on some cleaning planes, the wedge is mounted behind a wooden or metal clamp bar. Hitting the wedge down against the stops or hold down bar increases the pressure between the wedge and the iron, holding the iron firmly in place.
Mouth
Scrub planers have a wider throat than most other planers, allowing thick chips to pass through. Since the main purpose of a planer is to remove unwanted width or depth of wood as quickly as possible, a wide neck is essential.The wedge-shaped space above the mouth is often referred to as the throat, but some experts argue that it's not actually a part, but just a convenient space for shavings to pass through.
Pens
The front handles of wooden planers, if installed, vary widely in their design, usually depending on where the planer was made. In some, especially European ones, they are horn-shaped. On others, they can be fairly simple handles.Wooden planers also differ in the type of main handle. Sometimes the "hilt" is just the back end of the stock. Some have closed handles like traditional woodworking saws.They may also have a pistol grip.
But there are exceptions. . .
While almost all wooden planers follow the basic design outlined above, there are exceptions. One is that some planers DO have lever caps with handles.There are also wooden scrapers with metal mechanisms to adjust the depth and side angle of the iron. This simplifies the setting of the iron, but does not affect the characteristics of the planer.