US3522932A

US3522932A - Multipurpose wrecking bar etc.

Info

Publication number: US3522932A
Application number: US703117A
Authority: US
Inventors: Harold Y Nakasone
Original assignee: HAROLD Y NAKASONE
Current assignee: HAROLD Y NAKASONE
Priority date: 1968-02-05
Filing date: 1968-02-05
Publication date: 1970-08-04
Anticipated expiration: 1987-08-04

Description

1970 H. Y. NAKASONE 3,522,932

MULTIPURPOSE WRECKING BAR ETC.

Filed Feb. 5. 1968 5 FIG. 2 9

I FIG, 33' 3' l6 l8 /4 l5 [6 /6 INVENTOR l7 ,7 HAROLD XNAKASONE United States Patent 3,522,932 MULTIPURPOSE WRECKING BAR ETC. Harold Y. Nakasone, 91-336 Papipi Road, Ewa Beach, Hawaii 96706 Filed Feb. 5, 1968, Ser. No. 703,117 Int. Cl. B66f 3/00 U.S. Cl. 254-131 1 Claim ABSTRACT OF THE DISCLOSURE Removable fulcrum means for elongated tools such as crowbars and the like wherein the bar has ridges top and bottom in the direction of swing.

This invention relates to means and ways of effecting a better and wider use of leverage bars and especially to the well known wrecking bar, crowbar, and other types of levers. The wrecking bar, for instance, generally has a loop at one end with a chisel-like terminal and the other end provided with a short angled portion which also has a chisel-like terminal. One of the terminals is usually provided with a tapered slot to accommodate the shank of a nail or the like. The terminals are generally wedge shaped so that they can be forced between a pair of objects and separate them.

This present invention provides a stronger bar than is common in such tools and also provides an additional fulcrum means for the tool near one or both ends of the tool and which is effective to provide for greater leverage operation. The fulcrum or fulcrums may be removable so as not to be a hindrance to the full use of the tool when it is necessary to insert the tool between closely alined surfaces.

One of the principal objects of the invention is to pro vide a wrecking type bar that has more uses than present types and which can be so made that the shank can have a smaller cross-section than normal but nevertheless gives the same or greater strength.

Another object is to present a new and novel type lever means that is needed in the trade and which can be sold at an attractive price.

Other objects and advantages of this invention can be learned by perusal and inspection of the specifications and the drawings hereof.

FIG. 1 is a side elevational view of a leverage bar;

FIG. 2 is a top View of that shown in FIG. 1;

FIG. 3 is a cross-sectional view of the shank of the bar taken along the line 33 of FIG. 1 and shown on a somewhat larger scale;

FIG. 4 shows a modified form of the invention on a large scale; and

FIG. 5 shows another modified form of the invention.

With reference to the drawing figures, the numeral 1 indicates the elongated metal shank of the tool or Wrecking bar. The length thereof may be of any suitable size and the material may be iron. As shown in FIG. 3, the cross-section of the shank is a pentagon, but the number of flat faces is immaterial and may vary, in fact, the cross-section may be of a rounded shape or even an oval shape, but it is preferred to have the cross-section wherein the greatest length is in the plane of action for the bar. In the present design, the ridges, such as 2 and 3, are pro vided to give the greater strength in the swing plane of the bar. This design reduces liklihood of bending the bar and the bar for this reason can be smaller than similar bars now on the market.

One end of the shank 1 is shown as looped at 4 and its very end wedge shaped and provided with spread apart ears 5 and 6. The ears are formed with a tapered cut or opening 7 which is designed to engage nails etc. in a well ice known manner. The other end of the tool or shank is provided with an end portion 8 which is bent to a slight angle with respect to the shank and the very end of this portion is also provided with spread apart ears 9 and 10. These ears also provide a tapered cut or opening 11 for engaging nails etc.

FIG. 3 shows a fulcrum 12 in position on the shank 1 and welded thereto as indicated at 3'. As shown in FIG. 1 the fulcrum is positioned just back of the line marked X. When so positioned, the shank formed fulcrum at Y first comes into use as the shank is swung in a vertical plane to force movement of an object from a given surface. A little later, the fulcrum 12 becomes the Working fulcrum to provide a straighter lift as the object is lifted. The V-cut 2' in the top surface of the fulcrum 12 provides a proper seat for the shank and the fulcrum itself is long enough to prevent shifting of the shank out of line with respect to the plane in which the shank is made to swing.

The metal employed should be one of great strength such as iron or steel. Bending of the shank should not be possible by the weight of one or two men. The fulcrum, however, need only be metal of high compression strength.

FIG. 4 shows a modified form of a fulcrum means and it comprises a fulcrum bar 12 having a rounded bottom edge 13. The top of this bar is fiat and has a recessed.

portion like that shown in FIG. 3 to accommodate the shape of the shank. A pair of

metal spring clips

14 and 15, as shown, grip the shank. Each clip portion has a spring metal upright band or leg 16, an outwardly turned base portion 17 and an angularly directed short arm means 18. The base 17 is welded or brazed to the flat top surface of the fulcrum bar and the bases are in properly spaced positions so that the clip means snugly engages the shank 1, as shown, and this allows the fulcrum means to be shifted along the shank to any position desired where it can serve best.

Note, that the ends of the short arm means 18 is cu in a manner to provide an easy grip means for spreading the spring legs 16 apart in the event the fulcrum is to be removed for replacement, for instance. Since the fulcrums of this invention can have various depths, that is raise or lower the height of the fulcrum, various size fulcrums should be available. This avoids finding blocks to place under the usual built-in fulcrum like Y in order to raise any object higher than is permitted by the usual fulcrum. By shifting the fulcrum of this invention along the shank a position can be found most advantageous to meet the job at hand. For instance, when a nail is to be removed by the end 8, the fulcrum 12 is so placed that the nail can be lifted in a more vertical direction and thus avoid bending the nail at the start of the pulling operation. This makes it easier to remove the nail from a well seated condition because the friction is less when the nail is pulled straight upwardly from the workpiece. The same is true when the tool is employed to lift nailed planks.

FIG. 5 shows another modified form of the invention and the fulcrum in this form is also removable. The fulcrum means 20 has the rounded base portion 21 and the top surface is flat except for the recessed V-cut formed by the

surfaces

22 and 23. This V-cut accommodates the shape of the bottom portion of the shank 1. Integral with this fulcrum bar 20 there is a stud 24 which is adapted to snugly enter the bore 25 of the shank. If desirable, the fulcrum means 20 and its integral stem or stud 24 can be removed by tapping the top thereof with the small end of a nail or the like. The shank is provided with bores to accommodate the fulcrum device at proper advantageous locations.

Certain novel features and details of this invention are disclosed herein, and in some cases in detail, in order to make the invention clear in at least one or more forms thereof. However, it is to be clearly understood that the invention, as disclosed, is not necessarily limited to the exact form or forms and details given since it is apparent that various modifications and changes may be made without departing from the spirit and scope of the inven tion.

Having thus described my invention, what is claimed as new and desired to be secured by Letters Patent is:

1. The combination of a wrecking bar and a clip-on fulcrum element which can be shifted along the bar to various working positions; said bar having a plurality of substantially flat sides, the fulcrum element consisting of a short bar which is at right angle to the wrecking bar, a recess in a central portion of the short bar which is configurated to snugly accommodate a bottom portion of the wrecking bar, parallel spaced apart resilient arms integral with and extending from opposite sides of the recess on the short bar, said arms snugly engaging opposite sides of the Wrecking bar, and each arm having a distal end wherein the two ends are toed-in toward each other 4 to snugly engage different proximate flat sides of the Wrecking bar.

References Cited UNITED STATES PATENTS 2,525,226 10/1950 Lawellin 254-25 3,313,009 5/1967 Beckerer 24-257 D. 199,019 8/1904 Marson 254-131 137,333 5/1873 Terhune 254-27 1,395,956 11/1921 Gillis 254-25 2,272,362 2/1942 Barker 254-25 2,776,108 1/1957 Sherman 254-27 2,894,720 7/1959 Bennett 254-25 2,896,910 7/1959 Cooper 254-131 3,134,574 5/1964 Reuterfors 254-131 X OTHELL M. SIMPSON, Primary Examiner D. R. MELTON, Assistant Examiner US. Cl. X.R.