Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
1998-09-22
2001-07-03
Hall, III, Joseph H. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S056000
Reexamination Certificate
active
06253642
ABSTRACT:
BACKGROUND OF THE INVENTION
The present relates to power tools for tightening and loosening threaded connectors, such as bolts provided with nuts and washers.
It is known that most pneumatic, hydraulic or manually operated torque tools have a smaller operating radius than the nut placed on for tightening. It is also known that the industry is trying to build smaller equipment despite higher pressures and bigger loads.
U.S. Pat. No. 5,318,393 discloses a nut which is composed of two sleeves surrounding the bolt. Its diameter can not be reduced relative to the nut it replaces. A tensioning bolt disclosed in my U.S. patent application Ser. No. 091033,790 filed on Mar. 3, 1998 makes feasible to reduce the outside diameter of the nut below 1.5 times the bolt diameter. This allows the manufacturer to put the bolts closer together so as to obtain a better compression flow on the flange or casing. By placing the bolts closer together, more and thus smaller bolts can be applied to obtain the desired compression, especially since the preset, desired residual load can be obtained very accurately.
For tensioning of a bolt, a turning action force is applied by a power tool, and at the same time a reaction force must be applied which counteracts the turning action force. It is desirable to provide possibilities to apply the reaction force on various parts of the threaded fasteners, such as bolts provided with nuts and washers.
SUMMARY OF THE INVENTION
Accordingly, it is an object of present invention to provide a power tool which is a further improvement of the existing power tools for tightening or loosening bolts provided with washers and nuts.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in a power tool for tightening and loosening a bolt having a nut and a washer arranged so that the nut banks with one of its sides onto one of washer faces, the power tool comprising A power tool for tightening and loosening a bolt connected with a nut and a washer arranged so that the nut banks with one of its sides onto one of washer faces, the power tool comprising a housing, drive means accommodated in the housing, and at least two coaxial connecting means including a first connecting means provided for engaging and turning the nut and subjected to a turning force in one direction, and a second connecting means subjected to a turning force in an opposite direction, the coaxial connecting means being formed so that one of the coaxial connecting means is being turned while the other of the two coaxial connecting means stand still depending on a turning friction encountered as a result of one being connected with the washer while the other one is connected with the nut, or the result of one being connected with the bolt and the other one is connected with the nut, or as a result of one being connected with a reaction arm adapted to abut against an adjacent stationary object while the other one is connected with the nut.
When the power tool is designed in accordance with the present invention, then during tightening or loosening a threaded connector an active turning force is applied to the nut of the bolt, while a reaction force can be applied by the tool directly to the bolt so that the action force, turns around it, or it can be indirectly applied to the bolt through the washer which is connected to the bolt so that the action force turns inside the applied reaction force or the reaction force can be applied as a result of a connection to a reaction arm that abuts against an adjacent stationary object.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 2790343 (1957-04-01), White
patent: 3247741 (1966-04-01), Batten
patent: 3815211 (1974-06-01), Acord, IV
patent: 3868872 (1975-03-01), Wing
patent: 4179955 (1979-12-01), Akiyoshi
patent: 4836063 (1989-06-01), Fushiya
patent: 5123308 (1992-06-01), Yasutomi
patent: 5318393 (1994-06-01), Yamada
patent: 5490439 (1996-02-01), Matsumura et al.
patent: 5582079 (1996-12-01), Matsumura
patent: 2328444 (1975-01-01), None
patent: 3237325 (1984-04-01), None
patent: 7312435 (1975-03-01), None
Hall, III Joseph H.
Shanley Daniel
Striker Michael J.
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