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Патент USA US2409850

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Oct. 22, 1946.
v. H. GREY
BEVEL PROTRACTOR
Filed Aug. 25, 1944
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2,409,849
Patented Oct. 22, 1946
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omisol .STATES PATENT omer.
2,409,849
BEVEL PROTRACTOR
Vernon Henry Grey,v Coventry, England
Application August 23, 1944, Serial No. 550,712?`
‘
In Great Britain February 27, 1943
3 Claims.`
`
(Cl. 313-102)
1
2.
This invention relates to protractors and the
like measuring» instruments, such as are used by
rotatably mounted on said head», and an adjust-r
able blade or straight edge d arranged to slide
engineers for checking and determining angles,
and more particularly to the kind comprising a
head having a ñxed tangential blade, a calibrated
dial plate rotatably mounted on said head, and
an adjustable blade arranged to slide tangentially
of said dial plate and to be rigidly locked thereto.
The object of the present invention is to pro
vide improved means for locking the adjustable
blade to the dial plate.
For this purpose according to the present in
vention there is associated with the dial plate a
locking plate and means for moving the same
relatively thereto for the purpose of clamping
the adjustable blade to the dial plate.
.
.
tangentially of said` dial plate and to be rigidly
locked thereto»
‘
-
The dial. dat@ is. formed with a ña@ Surface C
at one part 0f. its. periphery and the means eg;-~
ployed according to this invention for locking the
adjustable blade d thereto consists of a locking
plate e which, together with the dial plate is piv
otally secured at one end to a boss a1 on the
head a by means of a central stud f and nut h
and is provided at the underside of its other end
with a transverse rib e1 or projection with which
a longitudinal groove d1 in the upper face of the
adjustable blade d is in sliding engagement.
The locking of the blade d to the dial plate c
is caused by moving the locking plate e radially
The said locking plate, which turns with the
dial plate, is releasably secured thereto at one
inwards so as to clamp the blade between the
end by means of a clamping screw and nut and
inner face of the rib e1 and the flat portion c1 of
has a, limited amount of radial movement rela 20 the dial plate. For this purpose the dial plate
tively thereto.
is provided with an upstanding stud i which pro
trudes with a limited amount of clearance
The means employed for operating the locking
through an outwardly coned hole 7c, or bush, in
plate consists of a sleeve nut carried by a stud
the locking plate e and is adapted to receive a
ñxed in the dial plate and having a coned end
adapted to engage and co-operate with a corre 25 sleeve nut Z having a coned end l1 for co-operation
with said coned hole or bush. To allow for
sponding outwardly coned hole or bush in the
radial movement of the locking plate a limited
locking plate through which the said stud pro
amount of clearance is also provided between the
trudes, the inner and smaller end of said conical
boss al on the head and a hole e2 in the adjacent
hole or bush being of slightly larger diameter
than that of the stud. The free or outer end 30 end of said plate, as clearly seen in Figures 3, 4
and 5.
of the locking plate is formed on one side with
a transverse rib or projection with which a
longitudinal groove in the adjustable blade is
adapted for sliding engagement. The arrange
ment is such that on slackening the clamping nut 3
the locking plate can be moved to clamp the ad
Normally, the dial and locking plates are rig
idly ñxed to the head by tightening the nut h
on the central‘stud f. When it is required to
adjust the longitudinal position of the blade d
relatively to the dial plate, the sleeve nut Z is
justable blade to the dial plate by screwing the
slackened to reduce the pressure between the
rib e1 and the near side of the groove d1, when
conical end of .the sleeve nut into the conical hole
the blade d can be readily adjusted to any desired
or bush in the locking plate, after which the
clamping screw and nut can be retightened.
40 position, and re-locked by tightening the said
sleeve nut l, the coned end of which oo-operates
In the accompanying drawing,
with the coned hole or bush in the plate e to
Figure 1 is a plan~ view of a protractor embody
draw the latter radially inwards.
ing the present invention.
Hgure 2 is an edge View thereof.
When it is desired to adjust the angle of the
Figures 3 and 4 are detail sectional views on a ' blade d the central nut h is slackened whereupon
larger scale showing the locking plate in its in
the dial plate together with the said blade can „
operative and operative positions respectively.
be turned into any desired angular position on
the head a. A spring m is preferably provided
Figure 5 is a detail plan View on a scale of the
locking plate and associated parts.
between the nut h and the boss al for the pur
Throughout the drawing like parts are desig- '
nated by similar reference characters.
Referring to the drawing, the invention is
shown as applied to an engineer’s protractor of
the kind comprising a circular head a having a
pose of holding the dial plate against the head
when the nut 11, is slackened.
I claim:
1. In a device of the character described in
combination a dial plate; an adjustable blade
fixed tangential blade b, a calibrated dial plate c 55 mounted slidably in tangential direction of said
2,409,849
3
4
Ysliding said adjustable blade so as to move it in
direction normal to the direction of sliding of
said locking member so as to exert during such
downward movement by means of its inclined
locking face pressure upon said locking member
said radial direction, said locking member hav
ing an inclined locking face; and an operating
member attached to said dial plate movably in
downward direction normal to the direction of
sliding of said locking member and adapted to
engage during such downward movement said
and thus to slide the same in radial direction
toward the center of said dial plate.
3. In a protractor or like measuring instru-V
ment, means for locking an adjustable blade
to a calibrated dial plate, comprising in combi;
nation a circular head, a locking plate slidably
inclined locking face of said locking member and
to exert pressure upon the same and thus to
mounted in said dial plate having a rib therein ,
which is adapted to engage a groove in said ad
slide said locking member in radial direction
toward the center of said dial plate.
justable blade, an elongated hole in said locking
plate which is adapted to engage a boss on said
dial plate along an edge portion of the same; a
locking member mounted slidably in radial direc
tion of‘ said dial plate and engaging during such
2. In a device of the character and for the
circular head which carries a locking means for
purposes described, in combination a dial plate;
an adjustable blade mounted slidably in tan
gential direction of said dial plate along an edge
portion of the same; a locking member mounted
slidably in radial direction of said dial plate and 20
said calibrated dial plate, an upstanding stud in
said calibrated dial plate, a coned hole in said
locking plate through which said upstanding stud
passes, a sleeve nut having a coned end mounted
upon said upstanding stud so that on the coned
yend of the sleeved nut being screwed down into
the coned hole in the locking plate the rib there
in draws the adjustable blade into intimate con
tact with the calibrated dial plate and locks same
clined locking face and adapted to engage said
locking member, said operating member being 25 thereto in its adjusted position.
VERNON HENRY GREY.
attached to said dial platemovably in downward
engaging during such sliding said adjustable
blade so as to move it in said radial direction;
and an operating member provided with anV in
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