U.S. patent number 3,871,105 [Application Number 05/442,381] was granted by the patent office on 1975-03-18 for adjustable sighting device for archery bow.
Invention is credited to George D. Brougham.
United States Patent |
3,871,105 |
Brougham |
March 18, 1975 |
Adjustable sighting device for archery bow
Abstract
An adjustable sighting device which may readily be attached to
all types of bows is described. A movable sighting element carries
a front bead and a back bead for aiming. The sighting elements are
attached to a carrier block engaged over a lead screw for fine
adjustment. Means are provided for rapid disengagement of the
carrier block for coarse adjustment of the height of the sighting
element.
Inventors: |
Brougham; George D. (Gillett,
PA) |
Family
ID: |
27009308 |
Appl.
No.: |
05/442,381 |
Filed: |
February 14, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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381252 |
Jul 20, 1973 |
3849894 |
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Current U.S.
Class: |
33/265 |
Current CPC
Class: |
F41G
1/467 (20130101) |
Current International
Class: |
F41G
1/00 (20060101); F41G 1/467 (20060101); F41g
001/46 () |
Field of
Search: |
;33/265,165 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Aegerter; Richard E.
Assistant Examiner: Stearns; Richard R.
Parent Case Text
This application is a continuation-in-part of my pending
application, Ser. No. 381,252, now U.S. Pat. No. 3,849,894 filed on
July 20, 1973.
Claims
What is claimed is:
1. An archery bow sight adapted to be mounted on the side of a bow,
comprising:
a. an elongated channel housing having a U-shaped cross section
defined by a bottom wall and side walls;
b. mounting means for attaching the housing to the bow;
c. an elongated lead screw disposed longitudinally within the
housing having a shaft extending therefrom;
d. a knob affixed to said shaft;
e. bearings mounted on the respective end portions of said housing
for rotatably supporting said lead screw;
f. a carrier block having an opening therethrough for slideably
mounting said carrier block on said screw, and being dimensional to
cooperate with said channel housing to prevent rotation of said
carrier block with respect to said lead screw;
g. a support bar mounted on said block transversely disposed with
respect to said housing, said bar carrying a sighting bead at each
end;
h. an L-shaped locking lever mounted on said block and pivotally
supported thereon;
i. said lever having at one end a threaded face portion engaging
said lead screw and, at the other end, a shank in contact with a
biasing spring, tending to maintain said face portion in engagement
with said screw, whereby, upon manually depressing said shank, said
face portion becomes disengaged from said lead screw, allowing the
free movement of said carrier block over said screw for coarse
adjustment of the height of said bar and, upon releasing the
pressure from said shank, engagement thereof is effected,
permitting fine adjustment of the height of said bar by the turning
of said knob.
2. A bow sight in accordance with claim 1 wherein each sighting
beads comprises a solid sphere attached to a pin member affixed to
and extending at an angle to a rod threadably supported in said
bar, wherein upon rotation of said rods, said beads may be
displaced relative to each other to be superposed in the line of
sight to the extent desired for the correction of parallax.
Description
BACKGROUND OF THE INVENTION
In archery, aiming is one of the most difficult things to execute.
The technique varies with the individual, some utilizing the tip of
the arrow as a sighting aid and others concentrating both eyes on
the target. The first of these techniques is generally referred to
as the gap system, or point of aim shooting, and the other is known
as instinctive shooting.
It has long been recognized that following the principles of the
sights of a rifle, bows may also be equipped with mechanical aids
in the form of sighting devices. A variety of these have been
suggested in the past -- some rather simple and others of
complicated form.
Mention is made here, for example, of U.S. Pat. Nos. 3,056,206;
3,488,853; 3,212,190; and 3,579,839, representing a variety of bow
sights, each having the common purpose of aiding the archer in
scoring.
The present invention is directed toward improving the ease of
handling a bow and the accuracy of hitting the target used in
archery or for the purpose of hunting. It consists of an adjustable
sight which may be easily mounted on the bow and readily adjusted
by the user for the distance desired.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational sectional view of the bow sight
construction attached to the side of the bow opposite the sight
window. The bow portion is shown in dotted lines.
FIG. 2 is a top view of FIG. 1 looking down the bow sight
assembly.
FIG. 3 is a side elevational view of FIG. 1.
FIG. 4 is a view showing the superposition of the face and back
beads for sighting.
DETAILED DESCRIPTION OF THE EMBODIMENT:
As seen in the figures, the bow sight construction comprises a
housing 11 which may be conveniently mounted by screws 12 and 13
onto the side 15 of the bow which is opposite the sight window
16.
Placed within the housing 11 and rotatably mounted in bearings 18
and 19 is a lead screw 20 having a shaft 21 extending downwardly
and terminating in a knurled knob 23.
A carrier block 25 is loosely fitted over the lead screw 20 for
riding up and down. As will be seen, the block 25 carries the bead
support bar 26 affixed thereto by means of the bolt 27.
In addition, the block 25 has a laterally-extending member 29 to
which is affixed the L-shaped locking lever 30 pivotally mounted
over the pin 31. The shank of the lever 30 is biased by the spring
33 nesting in a bore of the carrier block 25.
The lower extremity of the lever 30, indicated by reference 34, has
a threaded face 35 matching the thread of the lead screw 20. The
spring 33 maintains engagement of the face 35 with the lead screw
20.
Referring to FIGS. 2 and 3, it is seen that the bar 26 carries a
sighting bead at each end, namely, the face bead 38 and the back
bead 39. The beads consist of solid spheres supported at the end of
pins. The face bead 38 is affixed to a pin 40 bent at an angle and
mounted in a threaded rod 41 of a larger diameter. The latter fits
into a similarly threaded bore of the support bar 26. A lock nut 43
is provided for securing the rod 41 against turning. The effective
length of the rod 41 with respect to the bar 26 may be adjusted by
loosening the lock nut 43 and turning the rod 41 inwardly or
outwardly so as to place the bead 38 in proper alignment with the
shaft of the arrow 45 placed on the arrow rest 46.
The back bead 39 is similarly constructed, the component elements
being indicated by like reference characters bearing primary
indices.
The pin 40, as well as the pin 40', are bent at an angle so as to
fall in line with the face bead when properly adjusted and thus
form a line of sight for aiming purposes. FIG. 4 illustrates the
appearance of the sighting device when the beads 38 and 39 are
superposed. In practice, a slight positional difference between the
beads allows the correction of parallax in sighting inasmuch as the
face bead 38 is closer to the eye of the user than the back bead
39.
The sighting device herein described is extremely simple to use and
provides great accuracy.
At the start, the bow is firmly held by the user and the carrier
block 25 is set at a particular selected position. This may be
effected quickly by pressing down on the locking lever 30 at the
place where it is engaged by the spring 33. The lever 30, pivoted
over the pin 31, is thus displaced so that the threaded face 35 of
the extremity 34 is disengaged from the lead screw 20. The carrier
block 25 is thus free to slide over the lead screw 20 in any
desired up or down position for the approximate aiming distance
needed for the arrow to hit the target. This operation represents
the coarse adjustment.
Upon release of the locking lever 30, the spring 33 places it into
threaded engagement with the lead screw 20. Fine adjustment for
vertical movement of the carrier block 25 may then be obtained by
turning the knurled knob 23 in either direction so as to lower or
raise the carrier block 25. Since the latter carries the support
bar 26 to which the beads 38 and 39 are affixed, the desired
position of these may be accurately set.
The angular displacement between the beads 38 and 39 may then be
established by loosening either of the lock nuts 43 or 43' and
turning the rods 41 and 41' in order to obtain the superposition of
the beads for the correction of parallax as well as to provide an
alignment for accurate sighting of the target at the distance
determined by the position of the carrier block 25.
In practice, the face bead 38 is sighted in on the target first and
then the back bead 39 is lined up with it. Both beads are lined up
over the center of the arrow 45 and sighted in for the shortest
range. The vernier adjustment by means of the knob 23 can then be
used for trimming and setting.
The invention in its broader aspects is not limited to the specific
embodiments herein shown and described but changes may be made
within the scope of the accompanying claims without departing from
the principles of the invention and without sacrificing its chief
advantages.
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