Leonard L. Davis - Assigned Patents

Manufacturers Index - Leonard L. Davis

Leonard L. Davis
Springfield, MA, U.S.A.
Manufacturer Class: Metal Working Machinery

Patents

This page contains information on patents issued to this manufacturer.

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Key to Links for Patent Information

USPTO = U.S. Patent Office . Images of the actual patent can be viewed on the U.S. Patent Office web site but a special TIFF viewer must be installed with your browser in order properly work. More information on how to configure your computer to view these patents can be found at TIFF image Viewers for Patent Images.
DATAMP = Directory of American Tool And Machinery Patents . A sister site to VintageMachinery.org with information on patents related to machinery and tools. A much easier user interface than the USPTO's for finding information on machinery patents.

Patent Number	Date	Title	Name	City	Description
68,961	Sep. 17, 1867	Improvement in Adjustable Spirit Levels	Leonard L. Davis	Springfield, MA	Known example (pic 3) by Davis Level & Tool Co.
75,534	Mar. 17, 1868	Improvement in Adjustable Spirit Levels	Leonard L. Davis	Springfield, MA	Adjustable spirit level utilizing metallic elastic adjusting-ears and screws to adjust the spirit level after construction. Davis acknowledges Hosmer's patent, 39,906 of 11 Nov 1862 and others as other prior adjustable patents for levels.
D3,195	Sep. 22, 1868	Design for a Spirit Level	Leonard L. Davis	Springfield, MA	Classic Davis filigree design for metallic levels.
121,088	Nov. 21, 1871	Improvement in Spirit Levels	Leonard Leroy Davis	Springfield, MA	Adjustable feature that allows easy replacement and adjustment of the spirit level. The adjusting screw has an offset recess to accept the vial tube which when turned adjusts the position of the vial.
167,311	Aug. 31, 1875	Improvement in Bench-Planes	Leonard L. Davis	Springfield, MA	This plane was made by the maker of the well-known Davis levels and inclinometers. The patent is for a set of cutter adjustments for bench planes. One is for a "wedge", which is a metal piece that fastens to the bed just behind the mouth and provides support for the lower end of the cutter, and is adjustable to change the mouth opening. Another is a crosspiece which serves as the upper support for the cutter. This crosspiece is adjustable and provides a way to change the bed angle of the cutter. The crosspiece has set screws on both ends which provide a means for lateral adjustment of the cutter. According to PTAMPIA Volume 2 by Roger Smith, Davis planes were built with two styles of frogs. The earliest models featured a scalloped shaped bridge between the side rails. A cutter locking screw is in the center of the bridge and features the screw adjustment feature illustrated in the patent drawings. Later models featured a simplified frog with two round head screws, as shown in picture #4. These planes originally had a Moulson Brothers or Butcher cutter and cap iron.
D10,015	May. 29, 1877	Design for Spirit Levels	Leonard L. Davis	Springfield, MA	Classic Davis metal level. The rung style ornamentation is the design patented. Three other patents D10014, D10016, and D10017, were also submitted on the same date by Davis. Interesting to note that instead of a drawing provided for the patent application, a photograph was submitted instead. Additionally, there are only 14 days between the application and the grant date. Length of the patent is for 7 years.
D10,014	May. 29, 1877	Design for Spirit Levels	Leonard L. Davis	Springfield, MA	Classic Davis metal level. The vertical and horizontal rung style ornamentation is the design patented. Three other patents 10015, 10016, and 10017, were also submitted on the same date by Davis. It is interesting to note that instead of a drawing provided for the patent application, a photograph was submitted instead. Additionally, there are only 14 days between the application and the grant date. Length of the patent is for 7 years.
D10,016	May. 29, 1877	Design for Spirit Levels	Leonard L. Davis	Springfield, MA	Classic Davis metal level. Four ornamental cross-bars or rungs are the key patented design. Three other patents D10014, D10015, and D10017, were also submitted on the same date by Davis. Interesting to note that instead of a drawing provided for the patent application, a photograph was submitted instead. Additionally, there are only 14 days between the application and the grant date. Length of the patent is for 7 years.
D10,017	May. 29, 1877	Design for Spirit Levels	Leonard L. Davis	Springfield, MA	Classic Davis metal machinist type level. The ornamental base plate and short columns make up the design patent. Three other patents D10014, D10015, and D10016, were also submitted on the same date by Davis. Interesting to note that instead of a drawing provided for the patent application, a photograph was submitted instead. Additionally, there are only 14 days between the application and the grant date. Length of the patent is for 7 years.
288,624	Nov. 20, 1883	Spirit Level and Plumb	Leonard L. Davis	Springfield, MA
297,574	Apr. 29, 1884	Spirit Level	Leonard L. Davis	Springfield, MA	Four screws are used to hold and when necessary adjust the level spirit vial.
306,690	Oct. 14, 1884	Bit-stock (chuck)	Richard D. Johnson	Springfield, MA
342,727	May. 25, 1886	Ratchet bit-brace	John A. Bolen	Springfield, MA
432,180	Jul. 15, 1890	Bit-stock	Leonard L. Davis	Springfield, MA