US3692340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finger joint for jointing boards, battens, planks, and other comparable bodies
Assignee: Individual
•
Filing: 1970-04-09
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Granted: 1972-09-19
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Expires: 1990-04-09
Abstract
Abstract This invention relates to a novel finger joint for joining butt ends of timber, boards, planks and the like. Conventional finger joints have their fingers and notches extending transversely at right angles to two parallel side walls in the timber or plank. This means that at the juncture of a finger tip with a notch bottom that the effective glue surface is only equivalent to the width of the timer or plank. By making the fingers and notches diagonal to the two parallel side walls, the glue surface between contacting finger tips and notch bottoms is greatly increased thereby improving the strength characteristics of the jointed pieces.
Inventors
- 👤 Ahti Aadolf Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:35
CPC Classifications
B; B27; B27F; B27F1/00; B27F1/16; F; F16; F16B; F16B12/00; F16B12/04; F16B2012/043; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7045; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24537; Y10T428/31504; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
A finger joint for end joining first and second body members such as boards, battens, planks and other comparable materials including fibrous materials and synthetic resinous products, each said body member comprising a first pair of spaced and generally parallel sidewalls defining the width of the member and a second pair of spaced and generally parallel sidewalls transversely connecting said first pair of sidewalls and defining the thickness of the member, the cross section of each member comprising a quadrilateral shape, said joint comprising fingers on the end of said first body member pressed into corresponding notches between fingers on the end of said second body member, the medial planes of said fingers and notches on the end of each body member extending parallel to each other and diagonally relative to the planes of said first and second pair of sidewalls, some of said fingers and notches extending from one of said second pair of sidewalls to one of said first pair of sidewalls, some of said fingers and notches extending between the sidewalls of said first pair, some of said fingers and notches extending from the other of said first pair of sidewalls to the other of said second pair of sidewalls and none of said fingers and notches extending between the sidewalls of said second pair.
Claim 2
Dependent Claim
218 words
A finger joint for end joining first and second body members such as boards, battens, planks and other comparable materials including fibrous materials and synthetic resinous products, each said body member comprising a first pair of spaced and generally parallel sidewalls defining the width of the member and a second pair of spaced and generally parallel sidewalls transversely connecting said first pair of sidewalls and defining the thickness of the member, the cross section of each member comprising a quadrilateral shape, said joint comprising fingers on the end of said first body member pressed into corresponding notches between fingers on the end of said second body member, the medial planes of said fingers and notches on the end of each body member extending parallel to each other and diagonally relative to the planes of said first and second pair of sidewalls, some of said fingers and notches extending from one of said second pair of sidewalls to one of said first pair of sidewalls, some of said fingers and notches extending between the sidewalls of said first pair, some of said fingers and notches extending from the other of said first pair of sidewalls to the other of said second pair of sidewalls and none of said fingers and notches extending between the sidewalls of said second pair.
Claim 3
Dependent Claim
67 words
A finger joint as claimed in claim 1, characterized in that the directional angle of the medial planes of the fingers and their notches is in the range of from 10* to 80*, preferably about 45*, from the direction of the planes of the first pair of sidewalls, and correspondingly from the planes of the second pair of sidewalls, in the cross section of the body members.
Claim 4
Dependent Claim
54 words
A finger joint as claimed in claim 2, characterized in that the length of the outermost fingers in the length direction of the body members, and correspondingly the depth of the notches between the fingers, are greater than the length of the intermediate fingers, and correspondingly the depth of the notches between the fingers.
Claim 5
Dependent Claim
39 words
A finger joint as claimed in claim 2, characterized in that the length of the fingers in the length direction of the body members, and correspondingly the depth of the notches between the fingers, gradually increases toward the center.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |