US 3083598 A
Description (OCR text may contain errors)
April 2, 1963 J. E. KINNISON 3,083,598
IMPACT WRENCH Filed Jan. 7. 1960 4 INVENTOR 2 Jay/v '5 MAW/5'0 AGENT nited States This invention relates to an impact wrench.
Impact wrenches are generally used for tightening or loosening large nuts on bolts which connect parts of heavy machinery or structures. These large nuts require a substantial amount of force properly to tighten or loosen them. Such large nuts cannot be properly tightened by a conventional torque tool pulled by manual force and therefore an impact tool is used for such purposes.
The usual impact tool, commonly known as a slug wrench, is generally struck by a hammer to tighten or loosen large screw threaded nuts. These tools are readily usable when there is sufficient room to swing a heavy hammer, however, in restricted areas slug wrenches are difl'icult to use, time consuming, and oftentimes dangerous. Furthermore, conventional slug wrenches have striking faces which may not be effectively utilized if surroundings of the wrench limit application of striking force from a position disposed angularly to the arm of the wrench. In such instances, a hammer tends to glance off the striking face of a slug wrench and may strike the operator or adjacent objects and thereby create considerable damage. In many positions of slug wrenches within machine structures it is impossible to strike a slug wrench normal to its striking surface which renders the slug wrench very diificult to operate.
Accordingly, it is an object of the invention to provide an impact or slug wrench having a nut engaging portion and an extending arm having striking faces with recesses internally of the planes of the striking faces wherein a punch or bar may be used to impart an impact force to the arm of the wrench to thereby tighten a nut; said recess permitting an impact member to be nested therein and to be disposed at various angles relative to the axes of the arm of the wrench so that force may be applied eiiectively to the arm from such angularly disposed positions.
Another object of the invention is to provide an impact tool having a nut engaging portion and an arm which may be engaged by an impact tool from various angles and which also has striking faces which may be struck by a conventional hammer without injuring recesses in the arm which receive the angularly disposed impact tools.
Another object of the invention is to provide an impact tool of this class which may be utilized in restricted areas where it is necessary to apply fprce to the arm of the wrench at various angles to the axis thereof,
Another object of the invention is to provide an impact tool which is very eflicient in the tightening of large nuts and which is safe to the operator thereof.
Another object of the invention is to provide an impact tool which may readily be engaged by a hydraulic jack in order to apply torque to the wrench or impact tool.
Another object 9f the invention is to provide an impro e en e c n n a l r c t pe imp c tools,
Another object of the invention is to provide an impact tool which may be engaged and forced from various ane by a g at rie y f i pac or p we oo equ pment.
Another object of the invention is to provide an impact tool having a nut engaging portion and an arm extending therefromi said arm having recesses therein, the geometry of which readily retains the end of a power tool punch therein when disposed at various angles to the axis of the arm of the tool, whereby great force may be applied to if we the tool by a punch in one of the recesses without said punch sliding from the recess in the arm.
Other objects and advantages of the invention may be apparent from the following specification, appended claims and accompanying drawings in which:
FIG. 1 is a side elevational view of an impact tool of the slug wrench type showing improvements according to the present invention.
FIG. 2 is a plan sectional view taken from the line 2-2 of FIG. 1 showing the application of various power or impact tools at various angles to the arm of the present impact tool of the invention.
FIG. 3 is a diagrammatic view of a hydraulic power jack in position to cooperate with the impact tool of the present invention.
FIG. 4 is an enlarged fragmentary sectional view taken on substantially the same plane as FIG. 2; and
FIG. 5 is an enlarged transverse sectional view taken from the line 55 of FIG. 4.
The impact tool or slug wrench of the present invention is provided with an arm or body 10 having an integral head or Work engaging end 12 internally of which there are nut engaging portions 14. It will be understood that this head 12 may have a variety of structures for engaging a nut and may be of various dimensions as desired.
Integral with the arm 10 is a power receiving end 16 of the wrench. This power receiving end 16 is provided with slug impact faces 18 and 20 which are opposed to each other and parallel with the axis of the nut engaging portions 14. These faces 18 and 20 may be struck by a conventional hammer if desired. Recesses 22 and 24 inwardly of these faces 18 and 20, respectively, are provided to receive bars or punches of various impact tools as will be hereinafter described in detail. The recesses 22 and 24 shown in FIG. 2 are shown on enlarged scale in FIG. 4 of the drawings. 7
With reference to FIG. 4 of the drawings, it will be seen that these recesses 22 and 24 are identical and therefore the geometry of the recess 22 will be hereinafter described. This recess is elongated longitudinally of the arm 10 and is provided with short radius portions 26 and 28 in its opposite ends adapted to receive ends of P nches or a or t e pp on of force to the 10 when applied at various angles to the of the arm.
s sh wn in F 2 of he dra ings, fo xampl a. punch A may be struck from a remote position by a ham! mer B and this punch A may be at such an angle that it will engage the short radius portion 26 as shown in FIG. 4 of the drawings; it being assumed that the strug, ture surrounding the wrench or impact tool will impose the angular position of the punch A and the remote posi? tion of the hammer B. This arrangement permits impact force to be applied to the arm 10 of the wrench by the hammer B and from an acute angle to the axis of the arm 10. Likewise, an hand impact tool C may be used to apply force to a punch D. Also, a striking bar B may be operated manually and this bar may be a long heavy ba h ch y en e cen ly of o a n e d of one of the recesses 22 or 24,
Further references to FIG, 2 of the drawings will in: e that n i p ct t o P w ich may b d i en e1ee= lly or p um c ly ay pply o ce by m ans of its P n h 6 t o t ra i s'p rti n 26 of eith r of the recesses 22 or 24. The acute angular relationship of the punch G relative to the arm 10 may be dictated by cramped or restricted space occasioned by surrounding structure at the location in which the wrench or impact tool is operated,
With reference to FIG. 3 of the drawings, it will be seen that the arm 10 is engaged at the recess 24 by a plunger 30 of a hydraulic jack 32 or other suitable pressure tool supported on a plane H of a stationary structure. Coupled to this jack 32 by means of a flexible hydraulic tnhe 3,4 is a manual pump 35; having -a manual pliinger lever 38 'proyidedwith aleverage factor to develop high hydraulic pressures within the tube '34 and jack 52 ,or ,other means-of controlled pressure force.
Coupled to'the tubefig is a gauge 40 which may be calibrated in foot pounds of torque according to the radius of the arm 11) of the impact tool at a point engaged by the plunger 30 and also in accordance with the proper tions of the hydraulic system. Thus, the jack 32 may be proportionedfor a' torque wrench in accordance with the present invention having a given length of the arm 10. V V.
. It will be understood that the hydraulic jack 32 may apply tremendous force to the arm of the impact tool shown in FIG. 3 of the drawings and may be used from varions angular positions as desired and in accordance readily ltiflg'age these recesses. ,Normally, it is possible a "to reset the wrench for each angular increment of the n t htenin ca r n n t e fo pa m y be applied until the wrenchhas moyed a few degrees Wherenpign it may he reseton the nut as desired. In the case of a square nut, the resetting of the wrench may require rotation of ninety degrees for each increment of tightening anidiit' contemplated that the recesses 22 and "Ma er eta Pun es pp y force thro gh ut a retational anglenf ninety degrees with respect to the nut engaging portions of the head 12. Thus, the arm 10 ma'yirotate ninety degrees and still retain a punch in either of the recesses 22 and 24 regardlessqf the angle at which the punches or-tools are applied to the recesses. Reference isagain made to FIG. 4 of the drawings wherei th S ort adiu Po t ons 26 nd 8 e n a p nch e though it is 'dispnsed at, an acute angle to the arm '10.
Itwill he ob :ous to those skilledin the art that various modifications of the present invention may be resorted to in a manner limited only by a just interpretation of mana g c ims:
- 4 I claim: 1. In an impact wrench the combination of a wrench arm having a head provided with a nut engaging portion; said arm also having an impact or power receiving end provided with opposed striking faces thereon; said 7 arm being provided with recess portions inwardly of said opposed striking faces and communicating with the outer planes of said faces; said recess portions being disposed to receive impact tools at various angles to the axis of said arm. I
2. In an'impact wrench the combination of: a wrench arm having a head provided with a nut engaging portion; said arm also having an impact or power receiving end provided wtih opposed striking faces thereon; said arm being provided with recess portions inwardly of said opposed striking faces and communicating with the outer planes of said faces; said recess portions being disposed to receive impact tools at various angles to the axis of said arm, said recesses being elongated longitudinally of said arm and having short "radius portions at opposite ends there t Sa d e s mean b i elon a d ngi n ly or said arm and having shortradius portions at opposite ends thereof d' posed tosupport the end of a punch angularly disposed to the axis of the arm.
References Gited in the file of this patent UNIT-ED s'rA r s PATENTS 7 an impact tool of the class described the com "b l g l Qfan a m; a u n n e d 'ed b a power receiving end'of said arm opposite from said head'and having recess means therein disposed to re- "ceive a punch for the application of force to said arm, 'said recess means heing sufficiently deep to permit said punch to apply force to said arm at an angle to the axis