US Patent: 2,307,680
|
| Tap Structure
|
|
Patentee:
|
|
| George Hohwart (exact or similar names) - Orchard Lake, Oakland County, MI |
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Applied: |
Jun. 10, 1942 |
| Granted: |
Jan. 05, 1943 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Joel Havens
|
|
Description: |
| Claim:
Objects of the invention include the provision of a tap capable of being employed for threading the bore in a piece of work and to provide a relief at the root of the threads formed thereby; the provision of a tap which is capable of forming a thread in the bore of a piece of work to conform to the cross-sectional configuration of the threads of a threaded piece to be threaded thereinto and at the same time to provide a relief for the crests of the threads of such threaded piece; the provision of a tap having formed thereon two axially distinct groups of cutting teeth and one group of which is formed to cut a thread in the bore of a piece of work in substantially exact accordance with the cross-sectional configuration of at least a portion of the depth of the threads of a threaded part which is intended to be screwed thereinto, and the other group of which comprises cutting teeth which do not conform to the cross-sectional configuration of the threads of a threaded piece intended to be screwed into the work but instead are arranged to cut a relief at the root of the threads in the work for the crests of the threads of the threaded part to be received thereby; the provision of a construction as above described in which at least a portion of the cutting faces of one of the groups of cutting teeth on the tap are so constructed and arranged. as to cut a thread in a piece of work of approximately the full cross-sectional configuration of that portion of the teeth of a threaded Part adapted to be received thereby, and the remaining group of teeth are so constructed and arranged as to remove metal from the piece of work over a lesser width than the teeth of the first group but to a greater depth; and the provision of a tap of the type described in which the teeth of both groups are of generally triangular cross-sectional conformation but the angle between the sides of the cutting edges of one group is greater than the angle between the sides of the cutting edges of the other group and the depth of the teeth of the first group is less than the depth of the teeth of the second group. |
|
