US 3406460 A
Beschreibung (OCR-Text kann Fehler enthalten)
Oct. 22, 1968 w R COLWELL 3,406,460
BOLT HOLE MARKER Filed June 17, 1965 n 2- V AV AV AV 16V AV AV INVENTOR. F16- 4 W447i)? A. cam 44 47 TOP/145 Y United States Patent 3,406,460 BOLT HOLE MARKER Walter R. Colwell, 1853 Jay SL,
Ontario, Calif. 91762 Filed June 17, 1965, Ser. No. 464,649 1 Claim. (Cl. 33-189) This invention relates generally to devices used in frame construction, and in particular, to a new and lmprove d technique tool for marking the location of bolt holes 1n the base plate of frame construction utilizing concrete slab floors.
In wood frame construction of residential andcommercial buildings, the conventional technique utilizes a concrete foundation made of poured concrete wherem threaded securing bolts are set upright in the edges of the Wet concrete for the securing of a base plate or mudsill in the frame structure. The conventional method of marking the wood mudsills for the drilling of holes to fit over the preset bolts is to set the mudsill on top of the bolts and to hit the wood mudsill with a hammer, thus making an impression of the bolt end on the underside of the mudsill. However, this is quite unsuccessful and inconvenient since the bolts are never quite perpendicular and the bolt hole marking is never properly aligned w1th the actual entry point of the bolt into the concrete foundation. Commonly, since the bolt holes do not align with the bolts when the mudsill is placed into position, the carpenter spends a great deal of time and effort straightening the bolts and hammering the muds1ll into place. The result often is to split the mudsill or break a bolt or in some other manner delay the construction. Some carpenters attempt to solve this problem by drilling holes substantially larger than the bolt diameter. However, thls detracts from the mudsills stability and strength in relation to the frame structure above and the bolt below.
It is accordingly an object of this invention to provide an improved marking device.
Another object of this invention is to provide an improved bolt hole marking device for use in frame construction on top of concrete foundations.
A further object of this invention is to provide a new frame construction method.
Other and related objects will be apparent from the detailed description of the invention and various advantages not specifically referred to herein will be apparent to those skilled in the art in the employment of the invention in practice.
We have now found that the foregoing objects and their attendant advantages can be particularly realized in a bolt hole marking device comprising a generally hammer shaped marking device having a shaped tip for engaging a foundation bolt and a marking punch located at a predetermined distance back from the engaging tip, said marking punch having a point and a striking head for marking the bolt hole location.
The improved bolt hole marking device and technique of my invention can best be understood with reference to the accompanying drawings which form a part of this application, and wherein the same numerals are used to designate the same parts throughout the drawings.
In the drawings:
FIGURE 1 is a side view of the bolt hole marking device of this invention.
FIGURE 2 is a top plan view of the bolt hole marking device illustrated in FIGURE 1.
FIGURE 3 is a plan view of a typical corner of a rectangular concrete slab with foundation bolts set therein.
FIGURE 4 is an end view of the corner shown in FIG- URE 3 with my bolt hole marking device in position.
It is to be understood that the bolt hole marking device of my invention is applicable to any marking or punching use. Furthermore, although the bolt hole marking device of this invention is particularly adaptable for use in frame construction, my invention may be used in any type of construction, manufacture, or activity where a consistent marking distance is required on a mass scale. The bolt hole marking device and technique of this invention is described in a particular embodiment, but the structure of my invention can be widely varied as long as the basic elements of an engaging tip, a measuring arm, a marking punch and a handle are maintained.
Referring now more particularly to FIGURES 1 and 2, the bolt hole marking device therein shown comprises a handle 10. Handle 10 includes a steel shank 12, and a connecting arm 14. The outward end of handle 10 is conveniently provided with a wooden covering having steel shank 12 inserted therein and attached thereto. Depending from shank 12 and continuous therewith is steel connecting arm 14 which is inclined downwardly from the longitudinal axis of shank 12 and the wooden covering on the outward end of handle 10. Extending outwardly from the end of connecting arm 14 is measuring arm 16 which is illustrated as horizontal and which is inclined upward from the longitudinal axis of handle 10. In that portion of measuring arm 16 nearest to connecting arm 14 there is located marking punch 24 having head 26 and point 20. Head 26 is illustrated as serrated for better adherence of the striking hammer and point 20 is depending downwardly from measuring arm 16 a substantial distance sufiicient to provide a clear mark for drilling of bolt holes in base plates or mudsills.
At the end of the measuring arm 16 farthest from handle 10 is located shaped tip 18 with centering notch 19.
Tip 18 with centering notch 19 is shown as a curved tip which registers with the curved outer surface of a threaded foundation bolt. Of course, centering notch 19 can have substantially any curvature which makes registering with the foundation bolt convenient. Thus centering notch 19 can be a straight-sided angular notch rather than a curved notch or can fit entirely around the bolt thus providing an opening for the registering of the bolt with my bolt hole marking device. Further, tip 19 can have a substantially wider construction than arm 16 thus flaring outwardly so as to make registering with a foundation bolt easy and convenient.
Marking punch 24, as illustrated, is an integral part of the steel portion of the bolt hole marking device and thus has been cast with measuring arm 16 or welded thereto. Of course, marking punch 24 can be attached to measuring arm 16 by threading, wedging, or other attachment techniques. By making marking punch 24 detachable, it is possible to replace point 20 easily since point 20 is the primary point of wear on my bolt hole marking device.
Of course arm 16, connecting arm 14, shank 12 and marking punch 24 (although illustrated as generally rounded or cylindrical) can just as conveniently be made in rectangular, triangular, or other geometric cross sections which provide sufiicient strength for the type of use contemplated.
Handle 10 is illustrated as being covered with wood at the outward end thereof, which is typical of construction tools such as hammers and the like because of the resilient nature of the material and the shock absorbing characteristics thereof. However, the holding portion of handle 10 can be cast or formed integrally with shank 12 to form a single metal bolt hole marking device. Also, other materials which can be used for covering handle 10 include rubber, plastic, cork, compositions and the like.
The generally inclined construction of the bolt hole marking device as illustrated in FIGURE 1 is most convenient for construction use, but this is not critical to my invention, and the marking device can be constructed with measuring arm 16, and handle having a common longitudinal axis. The metal portions of the bolt hole marking device of this invention can comprise any metal having satisfactory strength characteristics. It is further contemplated that the normally metal elements such as measuring arm 16, connecting arm 14 and shank 12 can be constructed from other material having sufficient structural strength to withstand the blows.
The use of the bolt hole marking device of this inven tion is illustrated in FIGURES 3 and 4. FIGURE 3 illustrates the corner section of a rectangular concrete slab 30 having foundation bolts 32 set therein. Conventionally, for a 2 x 4 base plate or mudsill the foundation bolts are approximately one-half the Width of a 2 x 4 from slab edge 31'or approximately 1 inches. In the technique of using the bolt hole marking device of this invention, a chalk line 34 is snapped back from edges 31 of the hardened concrete slab 30 a distance equal to the width of a conventional 2 x 4 mudsill or approximately 3% inches wide. Then the edge of base plate or mudsill 36 is laid along the chalk line as illustrated and the bolt hole marking device is positioned with tip 18 against bolt 32 and point 20 resting on mudsill 36. Measuring arm 16 is centered easily by eye, perpendicular to slab edge 31. When point 20 is properly located, head 26 is struck with a hammer or other impact device in order to make a depression 38 with point 20 in base plate or mudsill 36. This marking technique is then repeated identically for each of the bolts along the foundation edge. When the bolt locations are all marked by depressions 38 from point 20, the base plate or mudsill 36 is then removed from the slab and holes of the proper diameter, i.e., a hole of substantially the same diameter or only slightly larger than the diameter of foundation bolt 32, is drilled at each of the bolt hole depressions '38. This technique is then repeated identically for each of the mudsill or base plates around the entire periphery of concrete slab 30 and any other location on slab 30 Where bolt-mudsill combinations exist.
It is to be understood that for different sized base plates or mudsills the spacing of foundation bolts 32 from edge 31 is different than illustrated but is equal to about onehalf the base plate width. The distance between edge 31 4 and chalk line 34 also must conform to the width of the base plate or mudsill being used. In the case-of mudsills or base plates 36 having a different width than that of the conventional 2 x 4, the distance between tip 18 and point 20 is then constructed to conform to a distance equal to the new base plateormudsill Width.
My bolt hole marking device and technique incorporate features most attractive to those. responsible for frame construction, and particularly those utilizing concrete slab foundations with typical stucco frame construction. Some of the more significant features include: (1) simple operation requiring only one-handed measuring and positioning; (2) simplicity of construction, particularly the feature of having no moving parts thus lending itself to economical manufacture; (3) ruggedness, which is a mandatory requirement of construction tools; and (4) accuracy and speed in marking bolt hole locations.
1. A method of marking bolt holes on a base plate member in slab construction wherein foundation bolts are provided at spaced intervals along and back from the edge of a concrete slab, said distance back being about one-half the width of said base plate, which comprises; marking said concrete slab with a chalk line along the entire edge of said concrete slab, said chalk line being spaced back from the edge of said concrete slab a distance equal to the width of said base plate; placing said base plate edge on the inside of and next to said chalk line; measure the width of the base plate distance back form said foundation bolt toward said base plate; and marking said location with a punch to define the point where the base plate bolt hole is to be drilled.
References Cited UNITED STATES PATENTS 1,255,190 2/1918 McBride 3341 1,598,986 9/1926 Ping 33--187 1,886,300 11/1932 Oslund 33l80 X 1,904,242 4/1933 Kieckheafer 33-191 2,528,775 11/1950 Ogden 33-180 2,786,274 3/1957 Early 3341 2,961,773 11/1960 Honn 33197 WILLIAM D. MARTIN, JR., Primary Examiner.