|Publication number||USRE40807 E1|
|Application number||US 11/803,417|
|Publication date||Jun 30, 2009|
|Filing date||May 14, 2007|
|Priority date||Aug 7, 1997|
|Also published as||US6068068|
|Publication number||11803417, 803417, US RE40807 E1, US RE40807E1, US-E1-RE40807, USRE40807 E1, USRE40807E1|
|Inventors||John R. Kovacs|
|Original Assignee||torcUp. Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (14), Referenced by (2), Classifications (9), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of application Ser. No. 08/910,963 filed Aug. 7, 1997 now abandoned.
The present invention relates to fluid-operated power tools.
Fluid-operated power tools, such as for example hydraulic torque wrenches, use a reaction element to react against a neighboring object. Such a reaction element can be formed as a reaction arm which is adjustable in several positions 360° around an axis of the cylinder-piston unit of the power drive. In the known power tool the reaction arm is provided with inner splines which cooperate with outer splines on the cylinder portion of the power drive. However, this has a substantial disadvantage. The outer splines of the cylinder portion in some instances abut themselves against a stationary object, such as for example a wall or the pipe, and the splines can get crushed. As a result, the reaction arm can not be mounted anymore for applications where the reaction arm abuts against an adjacent nut.
Accordingly, it is an object of the present invention to provide a fluid-operated power tool which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a fluid-operated power tool which has an engaging part with a turnable engaging element for engaging and turning a threaded connector, and a power drive part with a power drive operative for turning the engaging part, wherein the power drive part includes a fluid-operated cylinder-piston unit, said power drive part having an end spaced from said engaging part and provided with an inner opening with first connecting means; and a reaction member formed as a reaction arm which is turnable between a plurality of positions around an axis of said power drive part and fixable in each of said positions, said reaction arms having a projection which is insertable in said opening and being provided with second connecting means cooperating with said first connecting means so as to connect said reaction arm with said power drive part.
When the fluid-operated power tool is designed in accordance with the present invention, it eliminates the disadvantages of the prior art and provides for the above mentioned highly advantageous results.
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.
A fluid-operated power tool in accordance with the present invention has a housing which is identified as a whole with reference numeral 1. The tool has an engaging part for engaging and turning a threaded connector such as a bolt, nut and the like. The engaging part has a drive plate 2 provided with an opening in which a ratchet 3 is rotatably supported and engaged by a pawl 4. An engaging projection 6 is provided in the ratchet 3 and supported in sleeves 5.
The fluid-operated power tool further has a power drive part with a power drive for turning the drive plate 2 with the ratchet 4, and thereby the ratchet 3, so as to turn the threaded connector. The power drive includes a cylinder 7 formed in the housing 1, a piston 8 movable in the cylinder, a pivotable slider 10 arranged at the left side of a piston rod of the piston 8 and cooperating with a curved surface of the drive plate 2, and a rod 11 which connects the piston rod of the piston 8 with the drive plate to pull the drive plate back. The right open end of the cylinder 7 of the power-drive part is closed by an end cap 12 having a projecting portion 9.
The fluid-operated power tool further has a reaction arm 13 with an opening in its upper part in
The locking mechanism is provided for retaining the reaction arm on the power drive part of the tool. The locking mechanism includes a depression provided in the projection 9 of the end cup and formed for example as a groove 16, and a slider 17 which is movable in a vertical direction in
In order to provide an abutment of the reaction arm against a neighboring object in any position, the reaction arm can be removed from the tool, turned by a desired angle, and again mounted on the tool by interengagement of the splines OS and IS, and then locked in this position.
While no inlet and outlet ports are shown for the cylinder-piston unit of the inventive tool, they are well known in the art. In operation when a pressure fluid is admitted into the cylinder 7, it displaces the piston 8 with the piston rod, which in turn turns the drive plate 2 with the pawl 4, and the pawl 4 turns the ratchet 3 and the projection 6 engaged with the threaded connector, so as to turn the threaded connector.
It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.
While the invention has been illustrated and described as embodied in fluid-operated power tool, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3669012 *||May 19, 1970||Jun 13, 1972||Franz P Nebel||Apparatus for removing moisture|
|US3802517 *||Jun 14, 1972||Apr 9, 1974||Cooke Yarborough E||Screwdrivers and like tools|
|US4031893 *||May 14, 1976||Jun 28, 1977||Survival Technology, Inc.||Hypodermic injection device having means for varying the medicament capacity thereof|
|US4756241 *||Sep 30, 1985||Jul 12, 1988||Honda Giken Kogyo Kabushiki Kaisha||Piston for internal combustion engine|
|US4896584 *||Oct 21, 1987||Jan 30, 1990||Kurt Stoll||Piston-cylinder assembly|
|US4938296 *||Oct 12, 1988||Jul 3, 1990||Pacer Works, Ltd.||Drill rig assembly|
|US4938745 *||Aug 19, 1988||Jul 3, 1990||Sagstetter William E||Needle guard with visual confirmation of lock|
|US5003847 *||Aug 15, 1990||Apr 2, 1991||Wagner Paul Heinz||Hydraulic power wrench|
|US5076225 *||Dec 27, 1990||Dec 31, 1991||Toyota Jidosha Kabushiki Kaisha||Piston for an internal combustion engine|
|US5203238 *||Oct 27, 1989||Apr 20, 1993||Raymond Engineering Inc.||Low profile rack and pinion wrench|
|US5327864 *||Mar 8, 1993||Jul 12, 1994||Chrysler Corporation||Stratified-charge internal combustion engine with fuel injection and dual ignition|
|US5544627 *||Mar 21, 1995||Aug 13, 1996||Terziev; Nicola||Engine design for gasoline/diesel engines|
|US5630353 *||Jun 17, 1996||May 20, 1997||General Motors Corporation||Compressor piston with a basic hollow design|
|US6068068 *||Jun 17, 1999||May 30, 2000||Torcup, Inc.||Fluid operated power tool|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US20150298301 *||Apr 22, 2014||Oct 22, 2015||John D. Davis||Compact Hydraulic Torque Wrench Cartridge|
|USD750461||Jan 30, 2015||Mar 1, 2016||Campbell Hausfeld / Scott Fetzer Company||Tool accessory hub|
|International Classification||E21B3/00, B25B23/00, B25B21/00, B25B13/46|
|Cooperative Classification||B25B21/005, B25B23/0078|
|European Classification||B25B23/00H, B25B21/00D2|