Patent US4641704A successfully refreshed from Google Patents.
Patent US3686756A successfully refreshed from Google Patents.
US3686756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental hammer
Assignee: Individual
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Filing: 1971-04-07
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Granted: 1972-08-29
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Expires: 1991-04-07
Abstract
Abstract A tool for mounting or removing a crown or other dental insert using only one hand, so that the other is free to grasp the insert. The tool comprises a finger ring with a tool supporting rod extending from one end and a hammer supporting rod from the other. A second ring is mounted on the outer end of the hammer supporting rod. A spring-urged hammer on this rod has a ridge so that, when the tool is grasped between the thumb and middle finger of one hand, the index finger of that hand can operate the hammer.
Inventors
- 👤 Harry A Pankratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/08; A61C3/16; A61C5/00; A61C5/70; A61C3/164
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A dental hammer comprising first and second ring-shaped finger grips adapted to receive either the thumb or a middle finger of a dentist''s hand, a hammer supporting rod extending between and rigidly connected to said rings, whereby they are held a fixed distance apart and are immovable with respect to each other when one ring receives the thumb and the other the middle finger of the dentist''s hand, a hammer slidably mounted on said rod, a spring on said rod urging said hammer against one of said rings, the hammer having an outwardly extending ridge permitting its engagement by the forefinger of said hand, and a tool supporting rod secured to one of said rings on the side opposite its connection to said hammer supporting rod.
Claim 2
Dependent Claim
126 words
A dental hammer comprising first and second ring-shaped finger grips adapted to receive either the thumb or a middle finger of a dentist''s hand, a hammer supporting rod extending between and rigidly connected to said rings, whereby they are held a fixed distance apart and are immovable with respect to each other when one ring receives the thumb and the other the middle finger of the dentist''s hand, a hammer slidably mounted on said rod, a spring on said rod urging said hammer against one of said rings, the hammer having an outwardly extending ridge permitting its engagement by the forefinger of said hand, and a tool supporting rod secured to one of said rings on the side opposite its connection to said hammer supporting rod.
Claim 3
Dependent Claim
43 words
The combination according to claim 1, the connection between said tool supporting rod and ring permitting limited rotation of said rod on its own axis, whereby the orientation of a tool mounted on said rod may be changed with respect to said rings.
Claim 4
Dependent Claim
30 words
The combination according to claim 1, further provided with means for reversing the direction of impact of said hammer with respect to the mounting position of said tool supporting rod.
Claim 5
Dependent Claim
39 words
The combination according to claim 3, said last-mentioned means comprising means removably connecting one of said rings to said hammer supporting rod, whereby said ring may be removed and the hammer and spring reversed on said hammer supporting rod.
Claim 6
Dependent Claim
43 words
The combination according to claim 4, the connection between said tool supporting rod and ring permitting limited rotation of said rod on its own axis, whereby the orientation of a tool mounted on said rod may be changed with respect to said rings.
Claim 7
Dependent Claim
36 words
The combination according to claim 3, said last-mentioned means comprising releasable connections for said tool supporting rod on both of said rings, whereby the tool supporting rod may be mounted on one ring or the other.
Claim 8
Dependent Claim
43 words
The combination according to claim 6, the connection between said tool supporting rod and ring permitting limited rotation of said rod on its own axis, whereby the orientation of a tool mounted on said rod may be changed with respect to said rings.
Claim 9
Dependent Claim
121 words
In a dental hammer, first and second finger gripping rings adapted to receive either the thumb or a middle finger of a dentist''s hand, a hammer supporting rod extending between and connected to said rings, one of the rings being removably mounted on said rod, a hammer member of generally cylindrical shape slidably mounted on said rod and having a ridge extending outwardly therefrom, a helical coil compression spring surrounding said rod and urging said hammer against the other ring, and a tool supporting rod secured to the side of said other ring opposite said hammer supporting rod, the connection between said tool supporting rod and other ring permitting limited rotational adjustment of said tool supporting rod on its own axis.
Claim 10
Dependent Claim
121 words
In a dental hammer, first and second finger gripping rings adapted to receive either the thumb or a middle finger of a dentist''s hand, a hammer supporting rod extending between and connected to said rings, one of the rings being removably mounted on said rod, a hammer member of generally cylindrical shape slidably mounted on said rod and having a ridge extending outwardly therefrom, a helical coil compression spring surrounding said rod and urging said hammer against the other ring, and a tool supporting rod secured to the side of said other ring opposite said hammer supporting rod, the connection between said tool supporting rod and other ring permitting limited rotational adjustment of said tool supporting rod on its own axis.
References Cited (Backward Citations)
US2776490A
Cited
US3254412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |