US2559558A - Axial impact type rotary tool - Google Patents

Description

y 1951 P. H. CARLSON ETAL 2,559,558

AXIAL IMPACT TYPE ROTARY TOOL Filed Sept. 26, 1946 10 Afl) 11-+ 66 11 Lav f i '3 $77 I .52 fi Emu/WNW 3 PM E. 0%?

Patented July 3, 1951 AXIAL IMPACT TYPE ROTARY TOOL Paul H. Carlson and Edwin N. Carlson, St. Paul,

and Warren E. Carlson, Stillwater, Minn.

Application September 26, 1946, Serial No. 699,492

1 Claim. (Cl. 8152.3)

Our invention relates to an improvement in axial impact type rotary tool wherein it is desired to provide a simple and efficient means of loosening screws and bolts.

The object of the present invention is to provide a simple apparatus for loosening screws and bolts and particularly those which are difiicult to loosen. Many screws and bolts become rusted in place so that extreme difiiculty is experienced in in a corresponding socket of a screw driver shank or socket wrench. As a result the cam portion may be fitted with a axial screw driver shank for loosening screws and the like, or may be equipped with a socketwrench fitted for accommodating bolts or nuts of various sizes.

These and other objects and novel features of our invention will be more clearly and fully set forth in the following specification and claim.

loosening them. As a result the bolts often must In the drawings forming a part of our specifibe cut or drilled away, requiring considerable cation: valuable time and effort. With our apparatus Figure 1 is a side elevational view of our screw most screws and bolts so anchored may be loosand bolt loosening device, a portion thereof being ened with a single hammer 'blow, thus avoiding shown in section. the previous difficulty. Figure 2 is a vertical section through the ap- A feature of the present invention lies in the paratus of Figure 1 on the line 2-2 of Figure 1, provision of a screw and bolt loosening apparatus a different head being shown thereupon. including a handle portion and a cam portion Figure 3 is an elevation view of the cam portion connected thereto. The handle portion is conof our loosening device in one extreme position. nected to the cam portion in such a way that a Figure 4 is a view similar to Figure 3 showing longitudinal blow on the handle portion will the cam portion of the loosening device in its cause a twisting movement of the cam portion, other extreme position. thus transferring a sharp blow into a sudden The screw and bolt loosening device Aincludes twisting movement. This twisting movement is a handle I, a cam element indicated in general usually sufiicient to loosen bolts or screws. by the numeral H, and a head portion indicated A feature of the present invention lies in the in general by the numeral l2. The head I2 is fact that the cam portion of the apparatus is removable and replaceable with a head of a diflargely enclosed within the handle portion thereferent size or shape. f. thus pr v n n inj ry o h h s f he The handle portion Ill comprises an elongated p ra or during the operation of our to Th 39 shank is preferably being knurled or otherwise Cam portion is Connected to e a e po roughened on its exterior surface as indicated at by means of a transverse bar which is secured in [4, h u er extremity of the handle I3 is fixed relation to the handle. An inclined slot preferably provided with a portion l5 of reduced is provided through each side of the cam portion. diameter terminating in a tapered upper exp n l n itudinal movement of h handle tremity Hi. The upper extremity I6 is provided tion relative to the cam portion, the cam will be with a flat r slightly rounded end surface I! forced in a rotative direction by the pin, thus which may b t k by a hammer or other per... c n he r q ired twistin ction- The cam cussion instrument. The handle body In is proi p i d with n a so ke in he h le, an vided with a coaxial socket [9 which extends a in x l a nt th reW th- Thus the force o considerable distance into the handle from the the W is C t ed c y p the AS lower end thereof on the end opposite the surface the cam is centered with the bolt or screw loosen- H. The cam element ll fits snugly within the ing tool, the blow is transmitted centrally thereto, socket I 9 and is slidable and rotatable therein. thus holding the tool in place during its rotative An aperture 2|] is provided in the handle body movement. at the base of the socket I9, and a second aper- A feature of the present invention lies in the ture 2! is provided in the inner extremity of the provision of a torsion spring interposed between v cam element I I. Atorsion spring 22 is positioned the handle and the cam portion. This torsion in the socket it] having one end 23 thereof anspring tends to hold the cam portion in projected chored in the aperture 20 and the other end 24 position ready to be twisted by a relative longithereof anchored in the aperture 2!. The tortudinal movement between the handle portion sion spring tends to urge the cam element II in and the cam portion. one rotative position for a purpose which will be A further feature of the present invention lies later described in detail. in providing a multi-sided axial lug on the cam The cam element ll comprises an upper end portion of any tool designed to be accommodated 25, preferably formed in the shape of a sleeve Figure 4 of the drawings.

3 having an axial recess 26 therein. This sleeve 25 is provided with a pair of inclined slots 21 in the wall thereof. A pin 29 extends through the handle l near the lower extremity thereof and extends through the slots 21 in the sleeve 25. The slots 21 are so arranged as to guide the cam element l l in a rotary direction as the pin moves through the length of the .slots 21. In other words, longitudinal movement of the cam element ll relative to the handle l0 will cause the cam element to rotate throughout a predetermined angular distance. The torsion spring 22 is so constructed and arranged as to urge the camelement outwardly of the handle 7 H]. In other words, the cam element 1 I normally projects from the handle I0 in the manner illustrated in Figures 1, 2, and 3 of the drawings. However, if the cam element H is held from longitudinal movement and the end 11 of the handle is struck with a hammer-or similar instrument the cam element I will be rotated into'theqposition illustrated'in At the completion of the blow the spring 22 will tend t'o'urge the-cam element ll into its original projected position as shown in Figures 1,2, an'd'3.

.The outer end of the cam element H is provided with a multi-sided projecting lug or shank which is engageable in a similarly shaped socket 3| of the bolt or nut engaging device l2. As illustrated in Figure'l of the drawings this device 12 may be provided with an enlarged end 32 having .a, multi-sided socket 33 therein for accommodating a nut or the headof a bolt. Alternatively as illustrated in Figure 2"o"i the drawings the nut looseningdevice I I may be removed and the element 12 substituted'therefor. The element [2 includes'a multi 'sided socket 34 identical to the socket 3i and designed to receive the shank 30. The device I2 also includes a shank 35 aligned with the socket 34 and'bearing a wedge shaped end 36 in the nature of a screw driver. The element 12' may be used for loosening screws having slots therein by engaging the wedge shaped head 36 in the "slot of the screw driver and causing rotation thereof.

The operation of our'tool i believed obvious from the foregoing description. The'shank-iiii is fitted with a suitable element 12 or ['2' to fit the nut, bolt head, or screw'slotof the-bolt or screw to be loosened. The tool is then applied to the element to be loosened byeither engaging the bolt head or nut in thesocket 33 or by engaging the wedge end 36 of the element 12' in the screw slot. The handle II] is then firmly held with one hand while the end ll of 'thehandle is struck a sharp blow with a hammer or similar tool. The force of the blow tends to move the handle l0 toward the bolt or screw to :be loosened. As the cam element H is held from longitudinal movement, relative movement of the handle 10 will cause the head l2 or l2 to be rotated. Sufficient leverage is obtained in this way to loosen most nuts or bolts which have been rusted or otherwise become adhered in place.

It will be noted that the slots 21 are enclosed within the socket I9 andthat all of the exposed portions of the handle andscam element are substantially cylindrical. Thus the sudden rotative .foroe will have no tendency to catch the gloves or fingers of the operator to cause injury thereto. The slots 2! are arranged at a substantial angle to a plane perpendicular to the axis of the tool so that aconsiderable rotative force is exerted upon the tool head.

In accordance with the patent statutes, we have described the principles of construction and operation of our screw and bolt loosening device, and while we have ende vored to set forth thebest'embodiment thereof, we desire to'have it understood that-"obviouschangesmaybe made within the scope of the'following claim without departing from the'spirit'ofour invention.

We claim:

An axial impact type rotary tool for loosening a threaded member-and including a handle elementfa socket in one end thereof, a, cam element slidably and rotatably supported in said socket, 'a pin extending through said handle element transversely of said'socket and normally =fixed relative theretoysaid cam element having cam slot means therein'throughwhich the pin-extends, said cam slot'means acting to rotate'the cam element uponaxial movement'thereof relative to said handle element.

PAUL H. CARLSON. EDWIN N."CARLSON.

WARREN E. CARLSON.

REFERENCES CITED ".The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,384,417 .Weichhart July 12, 1921 1,731,979 Krummel Oct. 15, 1929 1,742,040 Lynch Dec. '31, 1929 1,743,505 Turgeon Jan. 14, 1930 1,772,723 Klein Aug. 12, 1930 2,078,631 Gagne Apr. 27, 1937 FOREIGN PATENTS Number Country Date 803,270 France June 29, 1936 343,400 Italy Sept. 28, 1936 531,797 Great Britain Jan.10, 1941

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