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Патент USA US3028861

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April 10, 1962
3,028,851
R. w. DRAKE
SPRING OPERATED cRoss Bow
Filed Oct. 4, 1960
2 Sheets-Sheet 1
/NVENTOR
Roben‘ W Dra/re
April 10, 1962
R. w. DRAKE
3,028,851
SPRING oPERATED cRoss Bow
Filed OCT.. 4, 1960
2 Sheets-Sheet 2
30
//V VEN TOR
Robert W Dra/re
United States Patent
IQ@
3,028,851
Patented Apr. 10, 1962
I
2
3,028,851
the frame 19 for rocking movement about the pin 43
as an axis. A link S0 has one end connected by a pin 49
to one end of the trigger 46 and the other end connected
SEEING OPERATED CRQSS EGW
Robert W. Drake, 2656 S. Trenton Ave., Tulsa, Okla.
by a pin S1 to the block 40 for eliecting rocking move
ment of the block 4i? responsive to rocking movement of
the trigger 46. As seen most clearly in FIGS. 6 and 7,
when the block 4% is in the cocked position of FIG. 6, the
in particular to a spring operated cross bow.
pivot pins 48, 49, and 51 are in an over center position
An object of the present invention is to provide a spring
which etîectively prevents movement of the block 40 in
operated cross bow which permits the shooting of several
10 the counterclockwise direction to the position of FIG. 7
arrows at one time.
in which the bow string 36 is released.
Another object of the present invention is to provide a
Filed Get. 4, 1960, Ser. No. 60,359
1 Claim. (Cl. 124-16)
The present invention relates to archery generally and
A spring 52 has one end connected to the trigger 46
cross bow which may be constructed with springs of vari
and the other end connected to the frame 1i) and urges
ous weights and sizes so that the power of the bow may
the trigger 46 to the forward position shown in FIG
be adjustable and that the range of the bow can be varied
15 URE 6.
to suit the user thereof.
In use, the bar element 16 is shifted to the position
A further object of the present invention is to provide
shown in FIGURE 2 to relax the spring 22 so that the
a spring operated cross bow which is simple in structure,
bow string 36 may be pulled from the position shown in
one which may be manufactured in quantity at reasonable
FIGURE 1 to the position shown in FIGURE 3 and the
cost, and one which is highly effective in action.
These and other objects will be apparent to the user 20 loop 38 manipulated so that its bightis seated in the
notch 54 provided in the upper end of the block 40.
of the bow when taken in connection «with the annexed
Next, the bar element 16 is shiftedA to the position within
drawings, in which:
the slot 12 by grasping the handle 56 and moving it Ifrom
FIGURE 1 is a top plan View of the bow constructed
the full line position to the dotted line position shown in
according to the present invention, the bow string being
25 FIGURE 2. This puts tension on the spring 22 so that
«shown in relaxed position,
when the trigger 46 is pulled and the block 40 is tilted,
FIGURE 2 is a side elevational view showing the means
the loop 3S is released and the bow string 36 is pulled
`for relaxing the coil spring so that the bow string may
forwardly under the tension of the spring 22 to discharge
be cocked,
an arrow 58 having one end engaged by the bow string
FIGURE 3 is a top plan view showing the bow string
30 36.
in cocked position,
The element 34- is provided with a resilient member
FIGURE 4 is a view on an enlarged scale, taken on
6i) which protects the arrow as it slides thereover, as
line 4--4 of FIGURE 1,
shown in FIGURE 5. As shown in FIGURE 4, the bow
string 36 has its ends secured by clevises 62 to the adja
line 5-5 of FIGURE 1,
35 cent ends of the lever 30 and 32, respectively, as shown
FIGURE 6 is a view on an enlarged scale, taken on line
FIGURE 5 is a view on an enlarged scale, taken on
with respect to _the lever 30.
While only a preferred form of the invention is shown
6-6 of FIGURE 3, showing the bow string in cocked
position, and
and described it is contemplated that other forms may
FIGURE 7 is a view similar to FIGURE 6 showing the
trigger in the position in which the bow string is released. 40 be constructed and numerous changes and modification
made therein without departing from the spirit of the
With continued reference to the drawings in which
invention as set forthin the appended claim.
like numerals indicate like parts throughout the several
What is claimed is:
views, the cross bow of the present invention comprises
A spring operated cross bow comprising an elongated
an elongated frame 10 having a slot 12 extending inwardly
from one end thereof. A handle 14 has one end fixedly 45 frame having a slot extending inwardly from one end
thereof, a handle having one end .fixed to the other end
secured to the other end of the frame 10.
An elongated U-shaped bar element 16 is disposed
within the slot 12 with the bight 20 adjacent to and
spaced from the end of the slot 12 adjacent the handle
14. The bar element 16 has the free ends of its legs 18
connectedto the frame 1t) by a pivot pin 24 for swinging
movement of the bar element 16 from the position within
the frame 19 to a position swung outwardly from the
frame 10 as shown in FIGURE 2.
A coil spring 22 has one end connected by a pivot pin
26 to the legs 18 of the element 16 and has its other end
connected to adjacent ends of a pair of links 28 which
have their other ends connected, one each, to the adjacent
ends of a pair of levers 30 and 32 mounted intermediate
their ends upon a cross frame element A34 iixedly secured
to the adjacent end of the frame 10.
A bow string 36 extends between and has its ends con
nected to the other ends of the levers 30 and 32.
A rigid wire loop 38 is carried on an intermediate part
of the bow string 36 and is engageable with a block 40
mounted in the slot 12 adjacent the handle 14 and con«
nected to the frame 10 for pivotal movement from the
cocked position shown in FIGURE 6 to the released po-k
sition shown in FIGURE 7.
The block 40 is connected by a pivot pin 42 to the
frame 10 and a spring 44 normally urges the block 40
to the cocked position shown in FIGURE 6. '
A trigger 46 is connected by another pivot pin 48 to
of said frame, an elongated U-shaped bar element dis
posed within said slot with the bight adjacent to and
spaced from the end of the slot adjacent said handle and
having the free ends of the legs thereof connected to said
50 frame for pivotal movement from the position within said
frame to a position in which said element is swung out~
wardly of said frame, an elongated coil spring disposed
bet-Ween the legs of said element and having one end piv~
otally connected to said element at a point spaced from
55 the bight of said element, a pair of levers each pivotally
connected to said frame adjacent said one end, means
connecting one end of veach lever to the other end of
said spring, a bow string extending between and having
its ends secured to the other ends of said levers, and trig
60 ger means mounted on said frame and releasably engage
able with said bow string, said trigger means comprising
a block mounted on said frame for movement in clock-`
wise and counterclockwise directions, said bow string be-`
ing seatable in a notch in said block and urging said block
to the counterclockwise direction position, and an over
center trigger and link mechanism releasably holding said
block in the clockwise direction position.
70
References Cited in the ñle of this patent
FOREIGN PATENTS
980,014
477,810
France ______________________ _- 1950
Italy ________________ __ Feb. 9, 1953
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