close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2131279

код для вставки
Sept.
27, 1938.'
2,131,279
R. |_. GREVE I
FRAMER FOR RAFTERS
Filed Sept. 26, 1956
_?POBfRT L. GREVE
@Y @uw
197' '7'GENE Y
2
2,131,279
As has been stated, the pitch of the rafter var
ies in different buildings, depending upon the
width and the rise of the roof. It is usually de
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
ñned in terms of inches of rise per foot of run.
To enable the index marker 25 to be set in ac
cordance 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 posi
tion, the blade I6 is at a right angle with re
spect to the stock. As the marker is moved down
the slot, the angle of the blade is varied, as is
15 obvious. Assuming that the marker is set at in
dex number 1, the blade will stand in substan
tially the position indicated in dotted lines in Fig.
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
1, where there is also indicated, in dotted lines,
a rafter R to which the invention is applied.
20 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 acom
mon rafter is to be cut to give the plumb-cut at
its upper end. If the length of the rafter be
25 known, the bottom cut can readily be made, the
same extending at a right angle to the plumb
cut. The length can, of course, be calculated
or can be ascertained from tables giving the
I have, however, pro
` same for various pitches.
30 vided 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
. from the center line of the latter blade.
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 correspond
40 ingly 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 hypothe
45
nuse. 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 in
tersection of the scales will then give the rafter
length. Thus, without calculation or recourse
50 to some table, which may not be at hand, can
the operator obtain the length of the rafter re
quired for the given pitch and run. Moreover,
having thus ascertained the length of the corn
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
.
a different pitch. Consequently, the scale 38a
alongside the slot 31 is different from the scale 10
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 15
the run of the rafter. That point of intersec
tion 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 20
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 raft 25
ers. 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 correspond
ingly 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 35
valley rafters, the link Y35 is positioned for mark
ing the side cuts for these rafters.` This re
sult 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 45
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 cen
ter line of the slot. A series of positions are in 50
dicated 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.
rnon rafter, he can move the framer to the as
55 certained position and, using the blade 30 as a
60
rafters, of course, are longer than the com
mon rafters for the same building and they have
.
As will be noted from Fig. 3, the blade I6 is
located near the side member ||. Near the op
posite 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
The pivot 20 will now be at the
position designated 2P. The screw hole for pin 55
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 60
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 in
The pointer 36 is guided up and down
dicated at3P. The end of the link is now swung 65
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 cen
ter line of the slot. The index mark “3” is now
made in the scale 29. vIn like manner, as many 70
marks as may be necessary for definitely lay
ing 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“,
the stock in a slot 31 in the plate I2, and is
etc, and the lines connecting them with the 75
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
70 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.
2,131,279
` center 'une »of the"-'slptjftheliatter assumes the
double-curve --form as shown. j The other "slot ¿3-1
is laid out in Ithe same‘manner'.
j _Y
'
Y It is believed that _the foregoing isladequate to
disclose the structure rof my invention, the Way
in which the shapes of the slots _are determined
and the manner in >which the `invention‘is vused.
It will be understood that, given the pitch of a
Y roof to be constructed, the'index kpointers are
15
from >an outer position ‘to an in'neriliòäítiön‘whè?ë
it 4is housed within vthe> stockfa scale impressed
uponV one of said side'plate's‘t'o designate _i'oöi'
pitches, a curved slot- -in@ the Saidside Identiteit--v
slidable
tendingyalongside
in said slot,said
a link
scale,connectin'grsaid
an'ffindex ’inem
lblade' s
With Ysaid index member, the angles of «the blade
andlink with the stock varying as'ïïthe 'indeik
member is moved inthe curved slot varr-dftheblade
set to that pitch, as'shownon the scales 29 and
38 and, in sodoing, the blades and the links are
and Vlink being adapted vto serve 'asïma?ker's "for" “it
the plumb çand side cuts, respectively,~~‘óf aijaëk
positioned for laying `"out all the common, hip,
valley and jack rafters required for that roof.
Having thus described my invention, I claim:
rafter having the Apitch for which the Yindex ~"infima
1. A device of the character described com
prising a pair of parallel spaced side plates with
means for holding them apart to produce a hol
low stock member with open spaces between the
edges of the plates, a pair of parallel pivot mem
20 bers 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
25 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
30 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 hav
ing 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 ñrst mentioned blade, both of
40 said blades pivoting fromY the same end of the
stock member and lying side by side in said mem
ber is set, that side of the stock member having
said slot being .provided with a second scale ex
tending along that margin from which the blade 15
is adapted to be extended, and a second blade
having a scale thereon corresponding in its mark
ings 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 an
gle from the ñrst blade and intersecting the
said second scale where the first blade is in other
than a right-angled position with the stock, the 25
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 com
prising a hollow stock member having opposed
side plates, a blade pivoted in said member ad
jacent 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
ond index member, said second blade and its
link being adapted for marking the plumb cut
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 raftér
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 extend
50 and side cut respectively of a hip or valley raiter
ing along that margin from which the blade is
_ ber when -they are in closed position, a scale de
noting pitches of hip and valley rafters impressed
upon the other of the side plates of the stock, a
45 second index member adapted for movement on
the stock alongside the last mentioned scale, and
a link connecting said second blade and said sec
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
55 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 respec
60 tive 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
65 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
70 which are required for a building having the
pitch for which the index members are set.
6. A device of the character described com
prising a hollow stock member having opposed
side plates, a blade pivoted in said member ad
75 jacent one end thereof and adapted to swing
adapted to be extended, and a second blade hav
ing 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 to
ward 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 speciñed, a third blade pivoted in the
stock adjacent the pivot of the first blade and
adapted to swing from an outer to an inner po
sition 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 ñrst 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 Il
2,131,279
and .its link being adapted for marking the plumb
longitudinal flange and in . which the secon‘d
rafter having the pitch indicated by the position
blade is provided with a transverse slot to receive
of- ythe -second index member upon the scale
alongside the slot for that member, and a fur
ther scale at the marginal edge of the said other
the‘said ñange.
plate of the stock, the said second blade being
io
es
the first blade is provided with an out-turnedA
c_ut and side cut respectively of a hip or Valley
adapted for connection with the said third blade
to__cooperate with the said further scale to show
the length of the >hipl or valley rafter required
by the setting of the second index member.
8.',A device as set forth in claim 6 in which
"
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
10
said second blade is attached.
ROBERT L. GREVEA
Документ
Категория
Без категории
Просмотров
0
Размер файла
590 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа