Bishop Adjustable Backsaw Model 10 Type Study. Multiple posts due to number of pictures.
Like most type studies, this one does not cover every little variation. Basically, the Bishop No. 10 saws can be separated into three groups. The first group covers the Fredrick Wuest patent of July 12, 1898 (#607107). The next group covers the Fredrick Wuest patent of Jan. 9, 1906 (#809485).
The last group is after they moved to Lawrenceburg Indiana.
The first patent of 1898 was assigned to the George H. Bishop company based in Cincinnati Ohio who produced many different types of saws from the early 1880’s until 1899. They moved the main office to Lawrenceburg Indiana in 1899, but continued to make and mark their tools as either from Cincinnati or Lawrenceburg until 1920. The 1906 patent was not assigned. (Perhaps Wuest received royalties for a license agreement?) In 1920 the company merged with a company in Columbus Ohio and called it the Ohlen-Bishop Company. So far it looks like the No. 10 was discontinued at this time. Anybody have one?
The first group follows the patent closely. Main features include a movable back that can be positioned to control depth of cut. This back is constructed with two strips of steel with a spacer at the toe. The spacer holds the two strips apart the thickness of the blade. The two strips and spacer are riveted together. The spacer has a hidden feature, small protrusions, that engage the teeth at the end of the blade. These teeth are not sharpened or set, and have a triangular shape. The teeth are only used to keep the back from slipping up or down. At the other end of the two strips at the handle end is a slot. When the back is inserted into the handle this slot first goes over the clamping bolt and then the screw. The screw is simply for alignment and should not need to be tightened during use. (It is a very short wood screw and only is seen on the left side of the handle.) The bolt for tightening the handle is a ¼-20 threaded rod with two flats on one end. These flats go through a washer with a slot to keep the rod from turning. Then a hex nut is put on the end with the flats. This is all inserted though the handle where another washer and a tightening lever are attached. On this first group the lever has an outward protrusion, later ones are flatter. The handles on the first group have a “patent applied for” stamped on the left side towards the bottom.
To use, loosen the handle by turning the lever counterclockwise a few turns. Slide the handle off the back. Move the blade back away from the toe until it disengages the protrusions. Position the blade to the desired depth and push back until the blade engages the protrusions again. Push the handle back on and tighten. Note: The lever position after it has been tightened can be adjusted. Determine where you would like the lever and then loosen the lever and adjust the nut. Retighten the lever.
Blades. The blades all seem about .030” thick. Not sure about lengths available in this first group.
See below for 10” and 12” examples. The 10” and 12” are about 3 ¼” wide, The 14” is about 3 ½” wide, and the 16” is about 4” wide. All these examples are file rip on one side and crosscut on the other. All the teeth point towards the toe, allowing a simple flip of the blade and back to change.
Backs. The back up to the 14” are all .30 thick measuring both sides and the saw blade. The 16 is thicker at .418” thick measuring both sides and the saw blade. All the backs are ¾” wide with the slots centered. Unknown what the longer ones are.
GROUP 1
TYPE 1-A
This saw is marked with GEO BISHOP on the back and Patent Applied For on the handle. Wheat carvings start at the bottom of the grip and go to the top. Then a second carving goes from the top down towards the blade and splits to go on both sides of locking lever. The blade is 14 PPI crosscut and 10 PPI rip. 10” long. The blade is not etched. The locking lever, threaded bolt, and nut are all brass (originally nickel plated). The hole where the bolt goes through is closer towards the end of the handle than later versions. The wheat pattern is also slightly different in this area.
TYPE 1-B
Not marked on back. Originally blued. Blade was blued both sides with a E.C. Simmons etch on left side. Patent Applied stamped on the handle. Wheat carvings start at the bottom of the grip and go to the top. Then a second carving goes from the top down towards the blade. The blade is 15 PPI crosscut and 9 PPI rip. 12” long. The locking lever and nut are brass, but the threaded rod is now steel. The hole for the threaded rod is now further from the end of the handle and the handle is longer.
TYPE 1-C
This is a saw owned by BeerHippy. (See earlier post 10727228) It has the handle of a type 1-B but the steel Type 2 lever and bolt assembly from the 1906 patent. Possibly using up stock.
It also has a blued blade and a E.C. Simmonds etch. Wheat carvings are like earlier types.
GROUP 2
1906 patent. Basically the same as the 1898 patent but with three differences. After the patent was granted they started putting the patent date on the saw back and/or on the right side of the handle towards the bottom. The lever was changed to a flatter profile and the threaded rod for the lever was replaced by a bolt with a smooth tapered head with a single lug under the head, all made from steel (nickel plated). The slotted washer was replaced with one with a square hole. The lug on the bolt engages one of the square corners to prevent turning. To adjust where the lever ends up after tightening, loosen it up until the lug can clear the washer and rotate in 90 degree increments. The last difference in the patent was the addition of an adjusting screw at the toe end. This feature has not been seen.
Note: The backs usually have the patent date stamped on it, and most are also marked with Geo. Bishop & Co. above the patent date. See details below for examples.
Type 2 are the most commonly found.
TYPE 2-A
This saw has G.H Bishop & Co. and PAT JAN’Y 9-06 on the back, two lines. It has PAT JAN’Y 6-09 on the left side of handle towards the bottom. (Note: This marking is usually damaged and hard to read.) The wheat carving on the handle is now a single row that starts in the middle and then goes to both the top and bottom of the grip. The blade is 15 PPI crosscut and 9 PPI rip. 12” long. This example has an unreadable etch on the blade. The etch looks similar to 2-B.
Continued on next post