US2131279A - Framer for rafters - Google Patents

Description

Sept.

27, 1938.' R. GREVE I FRAMER FOR RAFTERS Filed Sept. 26, 1956 POBfRT L. GREVE @Y @uw 197' '7' GENE Y same for various pitches.

. from the center line of the latter blade.

As has been stated, the pitch of the rafter varies in different buildings, depending upon the width and the rise of the roof. It is usually dened in terms of inches of rise per foot of run. To enable the index marker 25 to be set in accordance with different roof pitches, an index scale 29 is impressed on the stock alongside the slot 24, the graduations being numbered from zero on up in regular sequence, as shown. In Fig. 1, the marker is at the upper end of the slot and the pitch indicated is zero. When in that position, the blade I6 is at a right angle with respect to the stock. As the marker is moved down the slot, the angle of the blade is varied, as is obvious. Assuming that the marker is set at index number 1, the blade will stand in substantially the position indicated in dotted lines in Fig. 1, where there is also indicated, in dotted lines, a rafter R to which the invention is applied. When so applied, no matter where the index marker is set, a line drawn on the rafter along the edge of the blade will `show where acommon rafter is to be cut to give the plumb-cut at its upper end. If the length of the rafter be known, the bottom cut can readily be made, the same extending at a right angle to the plumbcut. The length can, of course, be calculated or can be ascertained from tables giving the I have, however, provided means for showing the length of the rafter required. It comprises a long blade 30 which is adapted to be slidably Aattached to the blade I6. On it is a scale 3|, graduated in feet, extending On the stock is another scale 32, also graduated in feet and extending from the `center line of blade I6. The blades I6 and 30 are perpendicular to each other. When the index marker 25 is set at a certain pitch and the blade I6 is correspondingly moved, the blade 36 overlies the stock, as

indicated in the dotted lines in Fig. 1, forming aY right triangle, of which the stock is the hypothenuse. The run of the rafter being known, the blade 30 may be slid toward or from the stock until the mark of the scale 3| which indicates the length of the run falls upon the scale 32. The mark on the latter scale at the point of intersection of the scales will then give the rafter length. Thus, without calculation or recourse to some table, which may not be at hand, can the operator obtain the length of the rafter required for the given pitch and run. Moreover, having thus ascertained the length of the cornrnon rafter, he can move the framer to the ascertained position and, using the blade 30 as a straight edge, mark the rafter for the bottom out. Having marked the rafter at both of its ends, it remains only to saw on the marked lines, moving the'saw at a right `angle to the plane of the side of the rafter. f

As will be noted from Fig. 3, the blade I6 is located near the side member Near the opposite side I2 and swinging parallel with the plane of movement of the blade I6 butin the opposite direction, is a blade 33. This blade is pivoted on the bolt or screw |52'- and is held from sliding thereon by spacing sleeves I8a and |93. It, too, has a marginal flange 34, like the flange I'I of blade I6 except that it is turned in the opposite direction. The blade 33 is pivotally connected, by link 35, with an index pointer 36 through elements identical with those shown in Fig. 4. The pointer 36 is guided up and down the stock in a slot 31 in the plate I2, and is held in any set position by a screw with a head 38, like the head 21 of the screw 26.

The blade I6 is intended for marking the plumb cuts of the common and jack rafters, while the blade 33 is intended for marking the plumb cuts of the hip and valley rafters. These rafters, of course, are longer than the common rafters for the same building and they have a different pitch. Consequently, the scale 38a alongside the slot 31 is different from the scale 29. The length of the hip and valley rafters can be determined by applying the blade 3|) to the blade 33 and by sliding it thereon until its scale 3l intersects a scale 39 on the plate I2 at a point representing on the scale 3| the length of the run of the rafter. That point of intersection gives, on the scale 39, the rafter length.

The jack, hip and valley rafters require side cutting at their upper ends, the jack rafters to fit against the vertical face of the inclined hip rafter and the inclined hip and Valley rafters to fit against the vertical face of the ridge. In my invention the links 2| and 35 are adapted to serve as the side markers or straight-edges for marking for-the side cuts of the respective rafters. That is to say, when the index pointer 25 is set to a pitch indicated by the proper mark on the scale 29 and the blade I6 is correspondingly swung, as indicated in dotted lines in Fig. y1, the link 2| has taken the position to serve as a straight edge for marking the side cut of the jack rafters. Further, when the index pointer 36 is also set to the same pitch, as indicated by the scale 38a, and the blade 33 is swung, as in Fig. 2, to give the plumb-cut for the hip and valley rafters, the link Y35 is positioned for marking the side cuts for these rafters.` This result is made possible by forming the slots 24 and 3l in the double curved shape shown. In Fig. 1, I have indicated how the slot 24 and the scale 29 are laid out. With the blade I6 standing out from the stock at a right angle, there would be no pitch and the index pointer 25 should be in zero position. The slot 24 should, therefore start at some point in thel arc of the circle about the pivot 20; and, since the slot must curve toward the far edge of the stock, as will be seen, the slot should kstart near the adjacent edge, the screw hole for the pivot pin 23 being at the center line of the slot. A series of positions are indicated for the pivot 20 as the blade is swung on its pivot I5. Now let the blade be moved to the position necessary for a pitch of 2 inches rise per foot of run. The pivot 20 will now be at the position designated 2P. The screw hole for pin 23 must now be so positioned over the stock that the link 2| is at the proper angle for the side cut of the jack rafter, and a mark is made through said hole. The center line of the slot 24 must include that mark. The indicating mark 2, .of the scale 29 is now impressed on the stock. The blade I6 is then swung to the angle corresponding to a pitch of three inches per foot, with the pivot 20 in the position indicated at3P. The end of the link is now swung until the angle of the link is correct for the side cut, and another mark is made through the screw hole in the end. 'I'hat mark must lie in the center line of the slot. The index mark 3 is now made in the scale 29. vIn like manner, as many marks as may be necessary for definitely laying out the center line of the slot may be made; and, when so made, the slot 24 may be formed. As will be seen from the numerous marks 212.31, etc, and the lines connecting them with the center 'une of the"-'slptjftheliatter assumes the Y roof to be constructed, the'index kpointers are set to that pitch, as'shownon the scales 29 and 38 and, in sodoing, the blades and the links are positioned for laying `"out all the common, hip, valley and jack rafters required for that roof.

Having thus described my invention, I claim: 1. A device of the character described comprising a pair of parallel spaced side plates with means for holding them apart to produce a hollow stock member with open spaces between the edges of the plates, a pair of parallel pivot members extending transversely through the stock near one of its ends, a blade pivoted on one of said members and adapted to swing from an outer position to an inner position where it is housed Within the stock, a scale impressed upon one of said side plates to designate roof pitches, an index member adapted for movement on the stock alongside said scale, a link connecting the said blade with said index member, the angles of the blade and link with the stock varying as the index member is moved and the blade and link being a-dapted to serve as markers for the plumb and side cuts, respectively of a jack rafter having the pitch for which the index member is set, a second blade pivoted on the other of said pivot members for swinging from an outer position to an inner position where it is housed within the stock, said second blade moving in a plane which is parallel with but is spaced from the plane of movement of the rst mentioned blade, both of said blades pivoting fromY the same end of the stock member and lying side by side in said member when they are in closed position, a scale denoting pitches of hip and valley rafters impressed upon the other of the side plates of the stock, a second index member adapted for movement on the stock alongside the last mentioned scale, and a link connecting said second blade and said second index member, said second blade and its link being adapted for marking the plumb cut and side cut respectively of a hip or valley raiter having the pitch indicated by the second index member upon said second scale.

2. A device as set forth in claim 1 in which each of the side plates of the stock is provided with a slot by which the respective one of the index members is guided in its movements.

3. A device as set forth in claim 1 in which each of the side plates of the stock is provided with a double-curved slot by which the respective one of the index members is guided in its movement.

4. A device as set forth in claim l in which means are provided for indicating the length of common rafter required for a building having the pitch for which the first mentioned index member is set.

5. A device as set forth in claim 1 in which means are provided for indicating the lengths of the common, the hip and the valley rafters which are required for a building having the pitch for which the index members are set.

6. A device of the character described comprising a hollow stock member having opposed side plates, a blade pivoted in said member adjacent one end thereof and adapted to swing from an outer position to an in'nerilitinwh it 4is housed within vthe stockfa scale impressed uponV one of said side'plate'st'o designate i'oi' pitches, a curved slot in@ the Saidside Identiteit--v tendingyalongside said scale, an'ffindex inem slidable in said slot, a link connectin'grsaid lblade' With Ysaid index member, the angles of the blade andlink with the stock varying as'the 'indeik member is moved inthe curved slot varr-dftheblade and Vlink being adapted vto serve 'asmaker's "for" the plumb and side cuts, respectively,--f aijak rafter having the Apitch for which the Yindex -"infima ber is set, that side of the stock member having said slot being .provided with a second scale extending along that margin from which the blade is adapted to be extended, and a second blade having a scale thereon corresponding in its markings to the markings of said second scale, said second blade being adapted for attachment to the first-mentioned blade and being slidable thereon toward and from the pivot of said firstl blade, the second blade extending at a right angle from the rst blade and intersecting the said second scale where the first blade is in other than a right-angled position with the stock, the construction being such that when the second blade is moved until the point o-f intersection of its scale with the second scale corresponds on the scale of the second blade to the run of a rafter said point of intersection will correspond on the'- second scale to the length of said rafter.

'7. A device of the character described comprising a hollow stock member having opposed side plates, a blade pivoted in said member adjacent one end thereof and adapted to swing from an outer position to an inner position where it is housed within the stock, a scale impressed upon one of said plates to designate roof pitches, a curved slot in the said side plate extending alongside said scale, an index member slidable in said slot, a link connecting said blade with said index member, the angles of the'blade and link with the stock varying as the index member is moved in the curved slot and the blade and link being adapted to serve as markers for the plumb and side cuts, respectively of a jack raftr having the pitch for which the index member is set, that side of the stock member having said slot being provided with a second scale extending along that margin from which the blade is adapted to be extended, and a second blade having a scale thereon corresponding in its markings to the markings of said second scale, said second blade being adapted for attachment to the first mentioned blade and being slidable thereon toward and from the pivot of said second blade, the second blade Vextending at a right angle from the first blade and intersecting the said second scale when the first blade is in other than a right angled position with respect to the stock, for the purpose specied, a third blade pivoted in the stock adjacent the pivot of the first blade and adapted to swing from an outer to an inner position where it is housed within the stock, said third blade moving in a. plane which is parallel with the plane of movement of the first blade but in direction opposed to; the movements of the rst blade, a scale denoting pitches of hip and valley rafters impressed upon the other of the side plates of the stock, said other side plate being provided with a curved slot alongside the last-mentioned scale, a second index member adapted for sliding movement within the latter curved slot, a link connecting said third blade and the second index member, said third blade by the setting of the second index member.

8.',A device as set forth in claim 6 in which the first blade is provided with an out-turnedA longitudinal flange and in which the second blade is provided with a transverse slot to receive thesaid ange.

9. A device as set forth in claim 'lv in which the first and third blades are each provided with an out-turned longitudinal flange and in which the second blade is provided with a transverse slot to receive the flange of the blade to which said second blade is attached.

ROBERT L. GREVEA

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