US3707788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking means for cap-type tooth
Assignee: Pengo Corp
•
Filing: 1970-12-28
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Granted: 1973-01-02
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Expires: 1990-12-28
Abstract
Abstract Improved retaining means for a tooth having a blade formed at its proximal end with a pocket which receives a shank attached by welding, bolting, etc., to earth excavating equipment. A resilient insert is positioned in the distal end of the pocket. Holes in the pocket walls and shank are initially slightly offset. The resilient insert is deformed by the distal end of the shank when a hard pin is driven through the holes, thereby bringing the holes up to alignment, forcing the tooth rearwardly and causing the margins of the holes in the pocket walls to tightly engage the pin and prevent unintentional dislodgement of the pin. When it is necessary to replace the tooth, the pin may be forcibly driven out of the holes.
Inventors
- 👤 W Sturgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:23
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/28; E02F9/2808; E02F9/2816; E02F9/2833; E02F9/2841
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
213 words
In combination, a tooth holder having a shank having a transverse forward distal edge, the forward end of said shank being approximately triangular in longitudinal cross-section, a tooth having a blade and means forming a pocket in the rearward end of said tooth, said pocket formed substantially complementary to the forward end of said shank and having opposed walls and a forward end, a resilient insert in said pocket between said distal edge of said shank and the forward end of said pocket, said distal edge engaging said insert when said tooth is in place with said shank in said pocket, said shank formed with a round first hole extending transversely through said shank, said opposed walls formed with aligned round second and third holes, said second and third holes being offset forwardly of said first hole prior to deformation of said insert, and a hard pin extending through said first, second and third holes in the assembled position of said tooth and holder to retain the tooth on the holder, said insert being deformed by said shank in said assembled position and biasing said tooth and holder apart, the margins of said second and third holes engaging said pin under stress of said insert to restrain unintentional, longitudinal movement of said pin.
Claim 2
Dependent Claim
213 words
In combination, a tooth holder having a shank having a transverse forward distal edge, the forward end of said shank being approximately triangular in longitudinal cross-section, a tooth having a blade and means forming a pocket in the rearward end of said tooth, said pocket formed substantially complementary to the forward end of said shank and having opposed walls and a forward end, a resilient insert in said pocket between said distal edge of said shank and the forward end of said pocket, said distal edge engaging said insert when said tooth is in place with said shank in said pocket, said shank formed with a round first hole extending transversely through said shank, said opposed walls formed with aligned round second and third holes, said second and third holes being offset forwardly of said first hole prior to deformation of said insert, and a hard pin extending through said first, second and third holes in the assembled position of said tooth and holder to retain the tooth on the holder, said insert being deformed by said shank in said assembled position and biasing said tooth and holder apart, the margins of said second and third holes engaging said pin under stress of said insert to restrain unintentional, longitudinal movement of said pin.
Claim 3
Dependent Claim
25 words
The combination of claim 1 in which said insert prior to assembly of said tooth and holder is loose in the bottom of said pocket.
Claim 4
Dependent Claim
17 words
The combination of claim 1 in which said insert is fused in the bottom of said pocket.
Claim 5
Dependent Claim
23 words
The combination of claim 1 in which said distal edge is formed with a cavity and said insert is partially within said cavity.
Claim 6
Dependent Claim
19 words
The combination of claim 1 in which said tooth is unitary and said pocket is forged in said tooth.
Claim 7
Dependent Claim
28 words
The combination of claim 1 in which said means forming said pocket is separate from said blade edges, said means forming said pocket being welded to said blade.
Claim 8
Dependent Claim
19 words
The combination of claim 1 in which at least one end of said pin is formed with a taper.
Claim 9
Dependent Claim
41 words
The combination of claim 7 in which said margins of said second and third holes engage the taper of said pin, said pin being restrained against movement longitudinally of the axis of said pin by said margins bearing against said taper.
Claim 10
Dependent Claim
50 words
The combination of claim 1 in which the ends of said pin are necked, said margins of said second and third holes engaging the necked ends of said pin, said pin being restrained against movement longitudinally of the axis of said pin by said margins bearing against said necked ends.
Claim 11
Dependent Claim
15 words
The combination of claim 1 in which said shank is substantially rectangular in transverse cross-section.
Claim 12
Dependent Claim
17 words
The combination of claim 1 in which said shank is transverse cross-section has more than four sides.
References Cited (Backward Citations)
CA490651A
Cited
US2427651A
Cited
US2483032A
Cited
US2657482A
Cited
US2936538A
Cited
US2994140A
Cited
US2987838A
Cited
US3091044A
Cited
US3188756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |