EP0259620A1
Expired / Lapsed
EP
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Cutter bit having hard tip with middle section defined by concave surface of revolution
Assignee: Kennametal Inc
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Filing: 1987-08-07
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Granted: —
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Expires: 2007-08-07
Abstract
Abstract A cutter bit hard tip (62) has an outer tip section (76), an inner flange section (78) , and a middle section (80) disposed between and merging at its opposite ends with the tip and flange sections and being defined by a continuous concave surface of revolution (82). The tip, flange and middle sections lie along a common longitudinal central axis (84). The tip section has a rounded-off end, and a frusto-conical surface of revolution (88) merging from the end. The flange section has a right cylindrical surface whose diameter is greater than the maximum diameter of the tip section. The middle section has a maximum diameter less than or equal to the diameter of the flange section and a minimum diameter substantially equal to the maximum diameter of the tip section. The concave surface of revolution of the middle section in profile has an outwardly and downwardly sloping configuration generally similar to that of the sides of a bell-shaped curve.
Inventors
- 👤 Wayne H. Beach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/28; E02F9/2808; E02F9/2858; E02F9/2866
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A cutter bit (60) having a hard tip (62), an outer tip section (76); an inner flange section (78); and a middle section (80) extending between and merging at its opposite ends with said tip and flange sections, characterized in that said middle section (80) is defined by a continuous concave surface of revolution (82).
Claim 2
Dependent Claim
55 words
A cutter bit (60) having a hard tip (62), an outer tip section (76); an inner flange section (78); and a middle section (80) extending between and merging at its opposite ends with said tip and flange sections, characterized in that said middle section (80) is defined by a continuous concave surface of revolution (82).
Claim 3
Dependent Claim
27 words
The hard tip (62) as recited in Claim 1, wherein said flange section (78) has a diameter which is greater than that of said tip section (76).
Claim 4
Dependent Claim
26 words
The hard tip (62) as recited in Claim 1, wherein said tip (76), flange (78) and middle section (80) lie along a common longitudinal central axis.
Claim 5
Dependent Claim
47 words
The hard tip (62) as recited in Claim 3, wherein said tip (76) section has a rounded-off end (86), and a frustoconical surface of revolution (88) merging from said rounded-off end and being generated by a line disposed at a predetermined angle from said longitudinal axis (84).
Claim 6
Dependent Claim
30 words
The hard tip (62) as recited in Claim 4, wherein said rounded-off end (86) of said tip section (76) has an internal radius from about 0.3048 to about 0.3302 cm.
Claim 7
Dependent Claim
25 words
The hard tip (62) as recited in Claim 4, wherein said tip section (76) has a maximum diameter from about 0.9677 to about 0.9931 cm.
Claim 8
Dependent Claim
24 words
The hard tip (62) as recited in Claim 4, wherein said tip section (76) has a length from about 0.3962 to about 0.4216 cm.
Claim 9
Dependent Claim
36 words
The hard tip (62) as recited in Claim 4, wherein said predetermined angle from said axis to said line generating said frusto-conical surface of revolution of said tip section is from about 49 to 51 degrees.
Claim 10
Dependent Claim
24 words
The hard tip (62) as recited in Claim 1, wherein said flange section (78) includes a flange portion defined by a right cylindrical surface.
Claim 11
Dependent Claim
24 words
The hard tip (62) as recited in Claim 9, wherein said cylindrical flange portion has a diameter from about 1.5748 to about 1.6002 cm.
Claim 12
Dependent Claim
24 words
The hard tip (62) as recited in Claim 9, wherein said cylindrical flange portion has a length from about 0.1651 to about 0.1905 cm.
Claim 13
Dependent Claim
26 words
The hard tip (62) as recited in Claim 9, wherein said flange section further includes a valve seat portion (81) depending below said cylindrical flange portion.
Claim 14
Dependent Claim
30 words
The hard tip (62) as recited in Claim 1, wherein said concave surface of said middle section (80) has an external radius from about 1. 3843 to about 1.4097 cm.
Claim 15
Dependent Claim
24 words
The hard tip (62) as recited in Claim 1, wherein said middle section (80) has a length from about 0.9829 to about 1.0083 cm.
Claim 16
Dependent Claim
40 words
The hard tip (62) as recited in Claim 1, wherein said concave surface of revolution (82) of said middle section (80) in profile has in outwardly and downwardly sloping configuration similar to that of the sides of a bell-shaped curve.
Claim 17
Dependent Claim
152 words
In a rotatable cutting bit (60) including a forward body portion having a front cavity (74), a shank portion (66) depending rearwardly from the forward body portion for mounting the bit in a socket (70), an improved hard tip (62) adapted to be mounted on said forward body portion, said hard tip (60) having an outer tip section (76); an inner flange section (78) including a flange portion defined by a right cylindrical surface (79) having a diameter greater than the maximum diameter of the tip section and a valve seat portion (81) depending below the cylindrical flange portion and correspondingly shaped to be inserted into the front cavity defined (74) in said forward body portion for mounting of said tip; and a middle section (80); characterized in that said middle section (80) is defined by a continuous concave surface of revolution (82) and is disposed between said tip and flange sections.
Claim 18
Dependent Claim
152 words
In a rotatable cutting bit (60) including a forward body portion having a front cavity (74), a shank portion (66) depending rearwardly from the forward body portion for mounting the bit in a socket (70), an improved hard tip (62) adapted to be mounted on said forward body portion, said hard tip (60) having an outer tip section (76); an inner flange section (78) including a flange portion defined by a right cylindrical surface (79) having a diameter greater than the maximum diameter of the tip section and a valve seat portion (81) depending below the cylindrical flange portion and correspondingly shaped to be inserted into the front cavity defined (74) in said forward body portion for mounting of said tip; and a middle section (80); characterized in that said middle section (80) is defined by a continuous concave surface of revolution (82) and is disposed between said tip and flange sections.
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