US996451A - Combined roof bevel and miter. - Google Patents

Description

Mag-km J. M. BRAGG. COMBINED ROOF BEVEL AND MITER. APPLICATION FILED 113N326, 1909.

996,451, Patented June '27, 1911. I I 2 SHEETS-SHEET 1.

l l I WITNESSES:

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J. M. BRAGG. COMBINED ROOF BEVEL AND MITER. APPLICATION FILED JUN 26, 1909.

Patented June 27, 1911.

I 2 SHEETB-SHEET 2.

IN VEN TOR.

WITNESSES:

' pin JAMES MERRICK .BRAGG, OF EAST HARTFORD, CONNECTICUT.

COMBINED ROOF BEVEL AND MITER.

Application filed June 26, 1909.

To all whom it may concern:

Be it known that I, J AMES MERRIGK BRAGG, a citizen of the United States, and a resident of East Hartford, in the county of Hartford and State of Connecticut, have in vented a new and Improved Combined Roof Bevel and Miter, of which the following is a specification.

My invention relates to the class of tools used for marking timber or other pieces to be cut to form a joint, and the object of the invention among others is to provide a tool of this class with which the setting of the parts to produce a given angle will also of necessity arrange them to produce other angles required on the same piece.

A form of tool in the use of which the objects sought may be attained is illustrated in the accompanying drawings, in which Figure 1 is a plan view of my improved tool. Fig. 2 is a view of the reverse side of the tool. Fig. 3 is an enlarged view of a portion of the cross-cut or face blade. Fig. 4: is a like view of the reverse side of this blade. Fig. 5 is a view showing the tool applied to a piece of timber inproducing the plumb or vertical bevel. Fig. 6 is alike view showing the tool with the parts arranged as in Fig. l but properly applied to the same piece of timber in producing the face or cross-cut bevel.

My improved tool while not limited in its use in determining the angles or bevels with respect to any special class of work, is peculiarly applicable for use in finding the angles or bevels in roof timbers, and is so constructed that when the parts are set to indicate a given angle or bevel it may,without changing the arrangement of parts, be employed to determine other angles or bevels on the same piece of timber. For instance, in the cutting of jack rafters two bevels are required at one end of the rafter, one of which is known as the plumb cut or bevel and the other the face or cross-cut bevel. When the tool is set to indicate one of these bevels by the use of one of the blades the same arrangement with the use of another blade may be employed to determine other bevels at the same end of the timber.

It is common practice in the construction of roofs to determine the different bevels by mathematical calculation, and this requires considerable knowledge and experience on the part of the one laying out the structure. By the use of my improvedtool little knowl- Specification of Letters Patent.

Patented June 27, 1911.

Serial No. 504,495.

edge or experience is required, it only being necessary to know the rise of the roof or the timbers to be cut and then by setting the parts with respect to the graduations denoting the rise the different angles may be determined in the ordinary manner of use of a miter or bevel.

In the accompanying drawings the numeral 1O denotes the stock or handle of the tool that is composed of any desired mate rial, preferably wood, of considerable thick ness, 11 the plumb or main blade, 12 the face or cross cut blade and 13 the bottom or seat blade. The names have been applied to the different blades as indicating the uses to which they are put and it will be noted that the plumb blade and the bottom or seat blade have the arrangement of a common square and may be graduated as is common in tools of this class. The stock is pivoted as at 14 to the plumb blade and has a slot extending from this pivoted end Within which are located the plumb and cross-cut or face blades, the latter extending through the stock. The cross-cut or face blade'12 is pivoted as at 15 to the bottom or seat blade 13 and as hereinbefore described extends through the slot 16 in the stock. A stud 17 extends across the slot 16 and through an adjusting slot 18 in the face blade. This slot is of curved form and is so constructed that when the edge of the stock registers with one of; the marks of either of the tables on each side of the slot the parts will be so arranged that the different bevels desired may be found. The table 19 at one side of the slot is arranged in connection with the graduations to denote both the rise of common rafters and the length of rafter which will be required for each horizontal foot. That is, the graduation at which the stock shall be set to prop erly determine the angles of a common rafter having a rise of one inch to each horizontal foot bears the numeral 1 indicating the rise and under the line a decimal indicating the length of such a rafter to each horizontal foot. The table 20 is similarly arranged to denote the rise of hips and valleys, while the table 21 on the reverse side of the blade has a similar arrangement to indicate the rise of octagon hips, and the table to indicate the rise of octagon jack rafters.

When it is required to produce the bevel cuts on a common rafter, the rise of the roof or of the rafter being known, the edge of the stock is set to register with the graduation denoting such rise. For instance, suppose it is desired to cut the bevels on a jack rafter, the rise of the roof or common rafter being three inches per horizontal foot, the edge of the stock is set to register with the graduation bearing the mark 3 in the table 19, shown in Fig. 3. The tool being now applied to the timber, as shown in Fig. 5 and a mark made along the edge of the plumb blade, the proper bevel for the vertical cut of the rafter is indicated. By now changing the position of the parts, and applying it to the timber as shown in Fig. 6, the edge of the cross-cut or face blade may be used to determine the proper bevel for the face or cross-cut of the rafter.

The proper bevel for the seat or horizontal cut of the rafter may be found with the tool without changing the arrangement of the parts by applying the tool to the timber at the opposite end and describing the vertical bevel. By now placing the outer edge of the plumb blade to register with this plumb bevel the outer edge of the bottom or seat blade will be properly located to indicate the bottom or seat cut for the rafter. By using the different tables the proper bevels may be found for the common rafters, for octagon hip rafters, for hip or valley rafters, and for indicating such cross-cut as may be required.

In the use of the tool for determining the bevels for jack rafters in octagon construction the blade 12 is pivoted in the opening 22 provided for this purpose and the tool then used as before described, the graduations of the tables 21 and 30 being made use of.

A bisecting blade 23 is arranged for attachment to the tool, this blade having a slot 24 arranged to receive a stud 25. One end of the blade when arranged for use is pivotedon the pin 26 and the blade extends through the slot 16 in the stock to receive: the stud or pin 25. When in this position, no matter what the relation may be of the stock and the plumb blade 11. by moving the tool to the point of the angle described by the stock and the main blade and with the stock located against the edge of the piece upon which this angle has been indicated, this blade will be found to bisect this angle. This adapts the tool for ready use in determining miters after the parts have been set at the angle required corresponding to the angle of the parts on which the miter is to be indicated.

While I have shown and described herein a satisfactory arrangement and construction of parts to produce the required results, I do not confine or limit my invention to such arrangement, as it may be departed from to a greater or lesser extent without avoiding the invention. In like manner and without change of parts the proper bevels for backing off hips and valleys may be found by the use of the tool.

When the use of the b-isecting blade is not required it may be affixed to the stock 10 by passing the studs 14 and 17 through the slot 23, thus securing the bisecting blade in an out-of-the-way position along the stock. 7

I claim 1. A plumb blade, a support rigidly connected with the plumb blade, a stock pivotally attached to the plumb blade, a cross cut blade pivotally secured to said support and extending across said stock, one of said parts having indicating means to denote an angular position of the stock with respect to the plumb blade, means for movably connecting the cross cut blade and stock, one of said members (cross cut blade or stock) having means formed to cooperate with said connecting means to automatically determine the proper angular position of the cross cut blade and stock to correspond with the angle between the plumb blade and stock to produce different plumb cuts and the proper cross cut for each of said plumb cuts.

2. A plumb blade, a stock pivotally attached thereto, a support rigidly connected with the plumb blade, a cross cut blade movably connected with the support and projecting across said stock, one of said parts (cross cut blade or stock) having means to indicate the angular position of the stock for the production of a proper angle for a plumb cut, a movable pivotal connection between said cross cut blade and stock, one of which parts has means to cooperate with said connection to automatically determine the angular position of the cross cut blade with respect to the stock to produce the proper cross cut to correspond with the plumb cut with the part-s in fixed relative position.

3. A carpenters square, a stock pivotally attached to one arm of the square and having a slot, a cross cut blade pivotally attached to the other arm of the square and projecting through the slot in the stock, said cross cut blade having a slot, a pin secured to the stock and projecting into the slot in the cross cut blade, which slot is formed to angularly position the cross cut blade with respect to the stock to indicate a proper cross cut and a certain plumb cut to correspond therewith without intervening change in the adjustment of parts and means for clamping the parts together.

4. A stock and a connected main blade arranged to indicate different angles, a bisecting blade attached to the main blade and movable longitudinally at its pivot and movably engaged with the stock, and pivotalattachments for said blade and stock so arranged that the bisecting blade may serve to determine an angle equal to half that between the main blade and stock in every position of the latter two parts.

5. A stock, a plumb blade to which the stock is pivotally attached, a seat blade arranged at a right angle to the plumb blade, a cross cut blade pivotally attached to the seat blade, the pivots of said cross cut blade and stock being located equi-distant from the vertex of the angle of the two blades, and the cross cut blade and stock engaging one with the other and having indicating means arranged to determine the relative position of said parts to indicate different plumb cuts and the proper cross cut for each of said plumb cuts without intervening change in the relative adjustment of the parts. I

6. A main blade having a supplemental blade rigidly secured at an angle thereto, a stock attached to said main blade to indicate different angles between said stock and main blade, a bisecting blade pivotally attached to the blades at the junction between the two blades and movably engaging said stock, and a pivotal connection for said stock to one of said blades (main or supplemental) so arranged that the bisecting blade may serve to determine an angle equal to half that between the stock and main blade with the latter in any position.

7. A stock having a slot, a plumb blade to which the stock is pivotally attached, a cross cut blade pivotally connected with the plumb blade and extending through the slot in said stock, means for movably engaging the cross cut blade with said stock within the slot, and a bisecting blade passing through said slot in the stock to movably engage the latter, and a pivot for the bisecting blade so arranged that the bisecting blade may serve to determine an angle equal to half that between the stock and the main blade.

8. A main blade, a stock pivotally attached to the main blade, a bisecting blade pivotally connected to the main blade and movably engaging the stock, a cross cut blade pivotally connected with the main blade and movably engaging said stock, and means on said stock for attachment of the bisecting blade when not in use.

JAMES MERRICK BRAGG. lVitnesses:

ARTHUR B. JENKINS, LENA E. BERKOVITOH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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