US3661216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact air driven tool
Assignee: Nippon Pneumatic Manufacturing Co Ltd
•
Filing: 1970-05-06
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Granted: 1972-05-09
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Expires: 1990-05-06
Abstract
Abstract An impact air driven tool having a cylinder including a piston member slidable therein and capable of being reciprocated by the action of compressed air. A handle cap unit is mounted on the upper end of said cylinder, and a chisel holding unit including a chisel member slidably supported therein is mounted on the lower end of said cylinder. A plurality of bolts are provided for fastening said cylinder, handle cap unit and chisel holding unit together, and a nut is threaded onto one end of each of said bolts adjacent to said handle cap. A socket member is threaded to the other end of each bolt adjacent to said chisel holding unit and has a contact surface on its outer periphery engageable with a supporting surface formed in a cut-out portion of the chisel holding unit whereby the relative rotation of said socket member with respect to said supporting surface is restricted. A stopper member for each nut has a polygonal opening through which the nut extends, and a collar member covers each nut and is held by a split pin extending through the collar and the nut, so that the stopper members and collars are prevented from disengaging.
Inventors
- 👤 Takanobu Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:37
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/124; B; B25; B25D; B25D9/00; B25D9/06; B25D9/08; B25D9/14; B25D9/26; B25D9/265; B63; B63C; B63C11/00; B63C11/52; B25D2250/00; B25D2250/065; B25D2250/255; B25D2250/265
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
235 words
An impact air driven tool comprising a cylinder including a piston member slidably received therein and capable of being reciprocated by the action of compressed air, a handle cap unit mounted on an upper end of said cylinder, a chisel holding unit including a chisel member slidably supported therein and mounted on a lower end of said cylinder, a plurality of bolts for fastening said cylinder, handle cap unit and chisel holding unit together, and a plurality of nuts each threaded to one end of each of said bolts adjacent to said handle cap, characterized in the provision of a plurality of socket members each threaded to the other end of said bolt adjacent to said chisel holding unit and formed at a portion of its outer periphery with a contact surface engageable with a supporting surface formed in a cut-out portion of the chisel holding unit whereby the relative rotation of said socket member with respect to said supporting surface can be restricted, a plurality of stopper members each having a polygonal opening through which each of said nuts is extended, a plurality of collar members each covering over said nut and formed with a through hole, and a plurality of splint pins each inserted in said through hole of the collar and extending through each through hole formed in said nut whereby said stopper members and collars can be prevented from their disengagement.
Claim 2
Dependent Claim
235 words
An impact air driven tool comprising a cylinder including a piston member slidably received therein and capable of being reciprocated by the action of compressed air, a handle cap unit mounted on an upper end of said cylinder, a chisel holding unit including a chisel member slidably supported therein and mounted on a lower end of said cylinder, a plurality of bolts for fastening said cylinder, handle cap unit and chisel holding unit together, and a plurality of nuts each threaded to one end of each of said bolts adjacent to said handle cap, characterized in the provision of a plurality of socket members each threaded to the other end of said bolt adjacent to said chisel holding unit and formed at a portion of its outer periphery with a contact surface engageable with a supporting surface formed in a cut-out portion of the chisel holding unit whereby the relative rotation of said socket member with respect to said supporting surface can be restricted, a plurality of stopper members each having a polygonal opening through which each of said nuts is extended, a plurality of collar members each covering over said nut and formed with a through hole, and a plurality of splint pins each inserted in said through hole of the collar and extending through each through hole formed in said nut whereby said stopper members and collars can be prevented from their disengagement.
Claim 3
Dependent Claim
50 words
An impact air driven tool as claimed in claim 1, further comprising a cylindrical cushioning member disposed within a lower portion of said chisel holding unit to permit it to receive a flange formed on an intermediate portion of said chisel member, said cushioning member being made of elastic material.
Claim 4
Dependent Claim
46 words
An impact air driven tool as claimed in claim 1, further comprising a valve member disposed in an exhaust port formed in said cylinder unit, said valve member being operable by pressure of exhaust gas to permit the latter to be discharged from said cylinder unit.
Claim 5
Dependent Claim
121 words
An impact air driven tool as claimed in claim 1, further comprising a bushing disposed within a lower porTion of said cylinder unit, through which bushing an upper end portion of said chisel being slidably received, a storage recess for storing an oiling medium therein and formed in the cylinder wall at a position adjacent to an intermediate portion of said bushing, an oiling nipple provided in the cylinder wall in register with said storage recess for supplying oiling medium into said recess, a gap communicating between said recess to the interior of said cylinder unit, and a plurality of fluid passages formed in said bushing and communicating to said recess by means of a guide hole formed in said bushing.
Claim 6
Dependent Claim
97 words
An impact air driven tool as claimed in claim 1, further comprising a valve structure including an operating member loosely received in a lower wall of said cylinder unit and capable of being backwardly collapsed as an upper end portion of the chisel upwardly travels within the cylinder unit and being projected as said end portion of the chisel downwardly travels within the cylinder unit, said operating member while in said backwardly collapsed state permitting the opening of a fluid channel for supply of compressed air into a lower cavity below said piston within the cylinder unit.
Claim 7
Dependent Claim
77 words
An impact air driven tool as claimed in claim 1, further comprising an exhaust opening communicating to the atmosphere and formed at a position adjacent to an air outlet and inlet port formed at a lower portion of said cylinder unit and a valve structure disposed at an intermediate position between said outlet and inlet port and said exhaust opening and capable of communicating therebetween only when the gas in the cylinder unit is to be discharged.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |