US3675973A - Concrete breaker - Google Patents

Abstract

A body having a working end is secured at its opposite end to a coupling for engagement to a mobile hammer or the like. The working end is provided with three spaced, hexagonal breaking bars. Two of the bars are positioned at opposite edges of the working end, whereas the third bar is centrally positioned between them. The central bar extends outwardly from the other two bars a substantial distance so that it contacts the concrete or the like before the other two bars.

Description

United States Patent Mottinger 1 July 1 1, 1972 s41 CONCRETE BREAKER 302,958 8/1884 Stutz ..299/69 x Inventor: Amhie Motfinser, 0 Marine Drive, FOREIGN PATENTS OR APPLICATIONS Bremerton, Wash. 98310 8,924 12/1852 France ..299/69 [22] Filed: Aug. 10, 1970 21 A L N 62 73 Primary Examiner-Ernest R. Purser I pp 0 Attorney-Seed, Berry & Dowrey [52] US. Cl 299/88, 299/94 [57] ABSTRACT [51] Int. Cl. 1 35/18 58] Field of Search 299/37 38 69 7o 88 94 A body having a working end is secured at its opposite end to a coupling for engagement to a mobile hammer or the like. The 56] References Cited working end is provided with three spaced, hexagonal breaking bars. Two of the bars are positioned at opposite edges of UNITED STATES PATENTS the working end, whereas the third bar is centrally positioned between them. The central bar extends outwardly from the 1,704,865 1929 P x other two bars a substantial distance so that it contacts the 3,276,820 10/1966 Dllson concrete or the like before the other two bars.

894,269 7/1908 Hendron.. ....299/37 1,830,751 11/1931 Cornett ..299/37 5-Clalms, 4 Drawing Figures PATENTEDJUL n 1912, 3. 675 973 INVENTOR. ARCHIE MOTTINGER ATTORNEYS CONCRETE BREAKER BACKGROUND OF THE INVENTION bar having a large circular cross section. In general, both the.

rectangular and circular breaker presented too large a working surface causing the surface worked on to break along an irregular line and often breaking-off portions of the surface desired to be left intact. In addition a large force was required to drive the breaker through the surface and much noise was created.

SUMMARY OF THE INVENTION It is an object of this invention to provide a concrete breaker which breaks the surface, such as asphalt, curbstone, concrete or the like, along a relatively even line.

Another object is to provide a breaker which requires less driving force to penetrate the surface. The reduction in the driving force, of course, allows the use of smaller mobile hammers and less strain on those hammers used. It additionally reduces the noise and vibration levels present during the breaking operation.

The preferred breaker of this invention comprises a body either integrally formed with a coupling end and a working end or in the form of an adapter body to fit over a conventional rectangular breaking tool which tool will then comprise the coupling end of the body. The working end is provided with at least three breaking bars, the centermost bar being substantially longer than the others.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric of a breaker employing the principles of the invention.

FIG. 2 is a side elevation of the breaker shown in FIG. 1.

FIG. 3 is an end elevation of the breaker shown in FIG. 1.

FIG. 4 is a bottom plan of the breaker shown in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The concrete breaker of this invention comprises a body 12 preferably in the form of a rectangular shell having a lower working end 14. The shell is fitted and welded to a conventional rectangular breaking tool 16 which for the purposes of this description will be termed a coupling end." The coupling end 16 is provided with openings 18 for securing to a conventional mobile hammer or the like. The body 12 may, of course,

be solid and integrally formed with the coupling end.

The working end 14 is provided with three breaking bars 20, 21, and 22. The breaking bars 20 and 22 are positioned adjacent the lateral edges of the working end. The breaking bar 21 is positioned centrally of the bars 20 and 22 and, as best shown in FIG. 2, is of a substantially greater length than the others. All of the bars are, in the preferred form, welded to the working end by weldments 24. All of the breaking bars are preferably of hexagonal transverse cross-section, although other shapes may be employed.

The purpose of having a longer central bar 21 is to assure that the central bar is the first to contact the concrete or other surface to be broken. As a result, the central bar penetrates the surface producing a hole which weakens the surface outwardly thereof. This weakened surface is then contacted by the two spaced bars 20 and 22 which complete the breaking of the portion of the concrete along the line between the three rods. The break thus produced occurs along a relatively smooth line. The working end also defines opposite cutting edges 26, one of which follows the bars through the break knocking off any remaining ja ed edges.

While the preferred form 0 my invention has been illustrated and described it should be understood that variations will be apparent to one skilled in the art. Accordingly, it is intended that the invention not be limited to the specific form illustrated but that the claims appended hereto be given the broadest interpretation possible.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A breaker for concrete or the like comprising a body having a coupling end and a working end spaced along a longitudinal plane thereof, at least three spaced breaking bars secured to said working end and extending outwardly generally along said longitudinal plane, said bars each having a blunt terminal end, at least one of said bars being positioned between two outer bars and being of a substantially greater length than said two outer bars.

2. The breaker of claim 1 wherein said bars are integral with said body.

3. The breaker of claim 1 wherein said bars are hexagonal in transverse cross-section.

4. The breaker of claim 1 wherein said two outer bars are positioned generally at the opposite edges of said working end and said bar of greater length is centrally positioned between said two outer bars.

5. The breaker of claim 1 wherein said body comprises a rectangular shell and wherein said coupling end comprises a conventional rectangular breaking tool inserted within said shell and welded thereto whereby said body, working end, and breaking bars form an adapter for insertion over said coupling end.

Claims (5)

1. A breaker for concrete or the like comprising a body having a coupling end and a working end spaced along a longitudinal plane thereof, at least three spaced breaking bars secured to said working end and extending outwardly generally along said longitudinal plane, said bars each having a blunt terminal end, at least one of said bars being positioned between two outer bars and being of a substantially greater length than said two outer bars.

2. The breaker of claim 1 wherein said bars are integral with said body.

3. The breaker of claim 1 wherein said bars are hexagonal in transverse cross-section.

4. The breaker of claim 1 wherein said two outer bars are positioned generally at the opposite edges of said working end and said bar of greater length is centrally positioned between said two outer bars.

5. The breaker of claim 1 wherein said body comprises a rectangular shell and wherein said coupling end comprises a conventional rectangular breaking tool inserted within said shell and welded thereto whereby said body, working end, and breaking bars form an adapter for insertion over said coupling end.

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