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Патент USA US3055012

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Sept. 25, 1962
L. w. BELL ETAL
POWDERACTUA'ITED TOOL
Filed April 21, 1959
3,055,008
3 Sheets-Sheet 1
Wk?
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INVENTORS
LEWIS WALTER BELL
\
WILLIAM A. EAGER
‘@i
BY RICHARD H. MAYNARD
their
ATTORNEYS’
V
Sept. 25, 1962
3,055,008
|_. w. BELL ETA].
POWDER ACTUATED TOOL
Filed April 21, 1959
I
5 Sheets-Sheet 2
I
F/G. 4 '5;
BY
-
INVENTORS
LEWIS WALTER BELL
WILLIAM A. EAGER
RICHARD H. MAYNARD
EM7QZ1QM¢DW
their
ATTORNEYS
Sept. 25, 1962
3,055,008
L. w. BELL EI'AL
POWDER ACTUATED TOOL
3 Sheets-Sheet 3
Filed April 21, 1959
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INVENTORS
FIG. //.
LEWlS WALTER BELL
WILLIAM A. EAGER
BY RICHARD H. MAYNA RD
3
their
arromvgrs
ice
Unite State
3,®55,d8
Patented Sept. 25, 1962
2
1
FIG. 10 shows a stud adapted to be broken off after
3,055,008
POWDER ACTUATED TOOL
Lewis Walter Bell, Monroe, N.Y., William A. Eager,
Westwood, N.J., and Richard H. Maynard, Mountain
viile, N.Y., assignors, by mesne assignments, to Star
Expansion Industries Corporation, a corporation of
it is driven in; and
FIG. 11 is a view showing a modi?ed barrel plug.
In the embodiment of the invention illustrated in FIGS.
1, 2 and 3, the stud gun comprises a barrel member 10
a?ixed at one end to a base plate 11 as by welding, an
aperture 12 in the base plate being aligned with the bore
13 of the barrel. A housing .14 surrounding the barrel
Filed Apr. 21, 1959, Ser. No. 807,900
extends around the edges of the base plate and two bolts
13 Claims. (Cl. 1-445)
10 15 mounted in the base plate extend through openings
16 in the housing to maintain alignment and to permit
This invention relates to powdered devices for driving
relative
longitudinal motion of the barrel and the
studs into masonry and the like and, more particularly,
Delaware
to a new and improved stud gun embodying special
safety features.
A rapid and e?icient method of mounting a stud, such
as a bolt or nail, in masonry structures is to drive the
stud into the structure with an explosive charge. Stud
guns for accomplishing this have been devised but they
have been found to be hazardous in many respects, either
as a result of misuse or because of unforeseen circum
stances.
As an example, if a gun devised to embed a stud in
a thick masonry wall is used against a wall that is too
thin, the stud can pass completely through the wall and
injure persons on the other side.
housing.
Each bolt 15 is surrounded by a spring 17 extending
from the base plate to the housing to urge the housing
against the head of the bolt while, as shown in FIG. 3,
the housing also carries two spacing bolts 18 which are
adjustable to limit the motion of the base plate and the
barrel with respect to the housing. The ends of these
bolts are normally spaced from the base plate 11 except
when the gun is in the cocked condition, as illustrated in
FIG. 3.
According to the invention, FIG. 1 shows that a recess
19 is cut into the base plate 11 adjacent the aperture 12
In some cases, an 25 to receive a projectile arresting member, such as a metal
attempt is made to avoid this result by providing a stud
with a large heavy flange or thick washer, but this is
undesirable in many instances because the flange or thick
washer is permanently retained between the wall and the
projecting portion of the stud.
ring 2b, which overlaps the end of the opening 12. As
described more fully hereinafter, the ring 20 has an
opening Zita and the size of this opening is selected to
permit a stud to pass through but to block a stud carrying
projectile from passing out of the bore 13. In order to
hold the arresting member 20 in position when the gun
is ?red, two scissor plates 21 and 22 are pivotally mounted
on studs 23 and 24 in the base plate 11 for angular
safety features.
motion toward and away from the axis of the bore 13.
Another object of the invention is to provide a stud
35 Two scissor plate guides 25 and 26 mounted at opposite
gun arranged to prevent a stud from travelling more
ends of the base plate 11, as by bolts 27, have recesses
than a predetermined distance beyond the end of the gun.
28 adjacent to the base plate and each of the scissor
A further object of the invention is to provide a gun
plates 21 and 22 includes tongue portions 29 at opposite
of the above character capable of embedding a stud in
masonry of any thickness and preventing travel beyond 40 ends which ?t into the recesses 28. As a result, the scissor
plates 21 and 22 are held securely in place against the
a predetermined point without interposing an arresting
base plate 11 and are movable between an open position,
member between the stud and the masonry.
illustrated in FIG. 2, which permits the arresting ring
These and other objects of the invention are attained
20 to be inserted, and a closed position, shown in FIG. 3,
by providing a stud gun with a removable arresting
covering the outer portions of the arresting member but
member at the end of the gun barrel. This arresting mem 45
leaving
the opening Zita unobstructed.
ber is arranged to permit a stud to emerge from the barrel
A compression spring 3i) is positioned between the
but to prevent a stud carrying projectile from completely
two scissor plates 21 and 22 urging them toward the
leaving the barrel. Preferably, the stud carrying pro
open position. However, two cam members 31 and 32
jectile is longitudinally split to facilitate removal from
mounted in the housing 14, as shown in FIGS. 2 and 3,
the stud after it is embedded. In addition, locking means
are shaped to drive the scissor plates inwardly toward
actuated by the arresting member may be included in
Accordingly, it is an object of this invention to provide
a new and improved stud ‘gun having highly effective
the closed position when the housing 14- is moved longi
tudinally with respect to the base plate 11 and the barrel
is in pos1t1on.
10 toward the cocked position shown in FIG. 3.
Further objects and advantages of the invention will
As described in detail below, the longitudinal relation
be apparent from a reading of the following description 55 between
the barrel 10 and the ?ring mechanism of the
in conjunction with the accompanying drawings in which:
‘gun
is
arranged
so that the gun cannot be ?red unless the
FIG. 1 is a view in longitudinal section illustrating
housing 14 has been moved to the cocked position shown
one form of stud gun arranged according to the invention;
in FIG. 3, compressing the springs 17. ‘In order to make
FIG. 2 is an end view of the gun shown in FIG. 1;
the gun to prevent ?ring unless the arresting member
certain that the gun cannot be cocked in this manner un
FIG. 3 is a sectional view taken on the lines 3—3 60
less the arresting member 28 is in position in the recess 19,
of FIG. 2 illustrating the stud gun after ?ring;
FIG. 4 is a sectional view similar to that of FIG. 3
the forward end of the barrel 10 carries a pivotally
mounted latch lever 33. One end 34 of the lever is mov
showing a diiferent form of stud and projectile adapted
able into and out of the recess 19 in response to pivoting
for use with the stud gun;
motion of the lever while the other end is formed with a
FIGS. 5 and 6 illustrate extracting tools for removing 65 notch 35. This notch is aligned with a shoulder 36 on
studs from the gun in the event of a mis?re;
the housing 14 when the‘end 34 is in the recess 19 and
FIG. 7 is a fragmentary view illustrating a form of
is displaced from the shoulder when the end 34 is outside
stud gun having a trigger-actuated ?ring pin;
FIG. 8 shows the gun of FIG. 7 in the cocked con
dition;
FIG. 9 illustrates a modi?ed projectile for use with
the gun;
the recess. Therefore, by virtue of a spring 37 urging
the end 34 toward the recess 19, unless there is an arrest:
70 ing member 20 in position in the recess, the housing 14 is
prevented from moving toward the cooked position by en
gagement of the notch 35 and the shoulder 36.
3,055,008
7
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3
At its -other end, the barrel 10 has a plug 38 formed
In order to facilitate the rapid mounting and removal of
with a bore 39 coaxial with the bore 13 and small enough
to block the head of a cartridge 40. ‘Inasmuch as the
the stud 49 from the projectile 48 and to accommodate
cartridge 40 is blown against the adjacent portion of the
various ‘forms of stud, the stud-holding forward end of
the projectile is preferably split longitudinally to provide
plug 38 when the gun is ?red, it may tend to spread out 5 a removable section 52, as best seen in FIG. 3. Inas
and become wedged in the bore 13. To obviate this, a
much as this removable section includes a substantial
plug 38a, shown in FIG. 11, having a spherically concave
area within the full diameter portion of the projectile, it
surface 3812 next to the projectile position ‘may be used.
will be apparent that the two parts of the projectile are
With this plug the cartridge tends to be deformed into a
held securely together as long as the projectile assembled
spherical shape rather than ?attening out and therefore 10 with the stud is within the bore of the barrel. The in
will not be wedged into the bore 13. A ?ring pin 4i. slid
terior of the projectile along the dividing line of the two
ably supported in the bore 39 has a narrow ?ring tip 42
portions is formed in an appropriate manner to receive
at one end and passes through an opening 43 in the hous—
the end of the stud. In the example shown in FIG. 1, the
ing 14, a head 44 being mounted on the pin at the outer
end of the stud 49 is formed as a bolt and the projectile
end. Also, a spring 45 is positioned between the head 44 15 has a correspondingly threaded interior 53 to retain this
and the housing to urge the tip 42 away from the inner end
stud. As illustrated in FIG. 10, a stud 49a having a
of the plug 38 while a ?ange 46 limits the motion of the
groove 4% at the junction betwen the threaded portion
?ring pin in this idirection. A sleeve 44a, which may or
and the forward portion may be used if no permanent
may not be attached to the head 44, surrounds the adja
projection is necessary. In this case the threaded portion
cent portion of the spring 45 and limits the motion of the 20 can be broken off after the stud is driven in. Also, in
head in the direction of the housing 14.
order to prevent spalling of the work surface when the
In order to prevent ?ring of the gun unless the housing
stud is driven into masonry or the like, a small washer 54
14 has been moved forwardly to the cocked position, as
may be force-?tted to the forward end of the stud shank.
shown in FIG. 3, the length of the ?ring pin is selected so
In operation, a stud 49 is mounted in the projectile 48
that with the barrel held in the forward position by the 25 by removing the section 52", inserting the head of the stud,
latch lever 33 the tip 42 cannot come into contact with
and replacing the removable section. A blank cartridge
a cartridge 40 at the inner end of the plug 38 even though
4% is inserted in the hole 47 at the opposite end and the
the ?ring pin head 44 is driven toward the housing 14 as
projectiie is pushed into the bore 13 until the end of the
far as the sleeve 44a which surrounds the spring, will per
projectile is seated against the inner end of the plug 38.
mit. On the other hand, the ?ring pin is long enough so 30 Frictional contact of the rings 513 with the bore 13, and
that when the head 44 is depressed, with the housing 14
the seating of the detent 50a in the groove Sub retain the
in the cocked position, the tip 42 can come into contact
.projectile in this position. In this condition, the gun
with a cartridge at the inner end of the plug 38, when the
cannot be ?red by actuation of the ?ring pin because the
head of the ?ring pin is struck.
barrel It) is in the forward position. Moreover the barrel
Preferably, the cartridge 40 is supported in a blind hole 35 cannot be pushed back to the cocked position because the
47 at the rear of a projectile 48, the projectile being suit
latch lever 33 is blocked by the shoulder 36.
ably arranged to receive a stud 49 at its forward end. If
In order to permit cocking, an arresting member 20 is
desired, a projectile 48a of the type illustrated in FIG. 9
inserted in the recess 19‘ thus holding the latch 33 in the
may be used with the gun. This projectile includes a
inactive position shown in FIG. 1. The two scissor plate
threaded axial passageway extending between the forward 40 guides 25 and 26 are then placed against the object into
portion and the hole 47 and a set screw 48b is normally
which the stud is to be embedded and the housing 14 is
retained in this passageway. If a cartridge 40 mis?res,
urged toward the object against the pressure of the springs
the screw 48b can be driven to the right as viewed in FIG.
17. As the housing ‘moves with respect to the base plate
9 to remove the cartridge so that no prying action against
11, the cam members 31 and 32 drive the scissor plates 21
the cartridge ?ange is necessary. ‘On the other hand, in
and 22 inwardly over the outer edges of the arresting
asmuch as the cartridge 40 is normally retained in the
member 20 to hold it in place. At the same time, the
hole 47 only by friction, when the cartridge explodes it is
?ring pin 41 moves toward the barrel 1%)‘ and ‘when the
driven out of the hole 47 as the projectile moves for
spacing bolts 1118 stop the relative forward motion of the
ward and is therefore self-ejecting.
housing with respect to the barrel, the tip of the ?ring pin
The diameter of the projectile 48 approximates that of 50 is far enough forward to be within the reach of the car
the bore 13 of the barrel and one or more spring rings 50
are supported in grooves in the periphery of the projec
tile body. These rings are fabricated of resilient mate
rial, such as spring steel, and they form a tight ?t within
tridge 4i).
Firing is accomplished by driving the ?ring pin against
the cartridge rapidly, as by a hammer blow on the head
44. The resulting explosion drives the projectile 48‘ to
the bore 13 So that once a projectile 48 is loaded in the 55 the forward end of the barrel forcing the pointed end of
barrel it is retained ?rmly in position against the inner
the stud 49 into a concrete formation 55, for example,
end of the plug 38 regardless of the orientation of the
stud gun. A spring loaded detent 549a may be installed in
the side of the barrel to assist in retaining the projectile
snugly against the plug 38 by engagement in a groove 50b.
At its forward end, the projectile 48 is provided with
‘a portion 51 of reduced diameter having an axial length
"approximately equal to the combined thickness of a
scissor plate 21 or 22 and the arresting member 20, and
the opening 20a of the arresting member has a diameter
large enough to permit this portion of the projectile to
pass through while preventing passage of the full diameter
portion. In addition, the material of the arresting mem
while the washer 54 is retained against the surface of the
formation, as illustrated in FIG. 3, to hold the surround
ing material in place. The stud 49 and the smaller diam
eter forward portion 51 of the projectile 48 pass freely
through the opening 20a of the arresting member 20‘ but
when the stud has become fully embedded in the object
55, the full diameter portion of the projectile 48 normally
stops short of the arresting member 20. If insu?icient
resistance to penetration is met by the stud 49 the full
diameter portion of the projectile 48 strikes the arresting
member 20 and the projectile is brought to a stop, the ar
resting member being held in place by the scissor plates
‘ber 20 is preferably softer than that of the projectile so
21 and 22. Even if the explosion of the cartridge has
that the projectile is not deformed upon impact, while the
generated sufficient force to drive the stud and projectile
arresting member undergoes some distortion to absorb the
farther into or through the object 55, this force is absorbed
shock of the impact when insu?‘icient resistance to pene
by the arresting member, which may be deformed slightly,
tration is encountered. For example, the arresting mem
so that further motion of the stud and projectile is effec
ber may be made of aluminum or zinc alloy while the
tively
prevented. In this manner, the stud is embedded
projectile is of steel.
75 to no more than the desired depth and is prevented from
3,055,008
5
passing through the object regardless of its strength or
thickness.
As the stud gun is withdrawn from the object, the
springs 17 urge the base plate 11 away from the housing
and the cam members 31 and 32 permit the scissor plates
6
ing toward the sear arm 77 but has an aperture 83 per~
mitting the trigger arm 82 to strike the dog 78 when the
barrel 10 is in its cocked position. As a result of this
arrangement, accidental discharge of the gun, as by jar
ring of the sear ‘76, is effectively prevented.
Adjacent to the ?ring pin 71, the sear “76 carries a
21 and 22 to move to the open position under the in?u—
pivotally mounted cocking member 84 biased by a spring
ence of the spring 30. Continued withdrawal of the gun
85. This member normally lies next to the ?ange 72,
from the object causes the projectile 48 to be pulled out
as illustrated in the drawings, and is urged toward that
of the barrel 1%}, which action removes arresting member
position by the spring 85 but it can be pivoted outwardly
20 from recess 19. The arresting member 20 is then
toward the pistol grip 69 when the barrel 10 is moved to
moved toward the forward end of the projectile 48 to re
the forward position after the ?ring pin has been released.
lease the removable section 52 and, with this section out
In operation, the various elements of the trigger-actu
of the way, the projectile is free to be withdrawn from the
ated stud gun are normally in the position shown in FIG.
head of the stud.
In the event of a mis?re, the stud and projectile can be 15 7 so that the sear 76 is held in place by the sear guard
79. Consequently, the gun cannot be operated until the
withdrawn from the barrel 1!) by inserting an extracting
forward end has been pressed against an object in the
tool of the type shown in FIG. 5 or FIG. 6. The ex
manner described above to cock the gun. When the hous
tractor 56, illustrated in FIG. 5, has a pair of spring—
ing 14’ has been moved forwardly to the cocked posi
biased jaws 57 and 58 arranged to snap over the washer 54
of the stud 49 when the tool is inserted in the bore so 20 tion shown in FIG. 8, the aperture 83 is aligned with
the trigger arm 82, permitting it to actuate the sear dog
that the stud and projectile can be removed by withdraw
78 while the opening 81 in the sear guard 79 is in a posi~
ing the tool. To permit this engagement, the tips 59 and
tion to permit the dog to be driven toward the barrel 10.
60 of the jaws 57 and 58 are sloped inwardly so that the
Moreover, the forward motion of the housing while the
jaws can open and pass over the washer 54 within the
con?nes of the bore 13. Similarly, the extractor 61 shown 25 ?ring pin '71 is held back by the sear 7‘6 and the cocking
member 84 has compressed the spring 74 to cock the
in FIG. 6 has a recessed head 62 shaped to ?t around the
tool.
washer 54 while within the bore 13, and a spring pressed
When the trigger 70 is operated, the dog 78 moves into
catch 63 has an inwardly inclined head arranged to slide
the
opening 81 pivoting the sear 76 to release the ?ring
over the washer so that the stud can be extracted by with
pin ?ange 72 from the cocking member 84 and the spring
drawing the tool from the bore. If desired, a ramrod 64
74 drives the firing pin against the cartridge in the pro
may be formed at the opposite end of either form of ex
jectile 48. As the trigger 70 is released and the barrel 10
tractor, or as a separate tool to push the stud and projectile
is restored to its forward position, the dog 78 is forced
into place in the bore.
out of the opening 81 by virtue of a bevelled edge, pivot
A projectile adapted for use with the stud gun may also
ing the sear 76. At the same time, the cocking member
be shaped to receive a nail-type stud 65 in the manner
illustrated in PEG. 4. ‘In the illustrated example, the
84- turns outwardly toward the pistol grip 69 because of
permanent projecting head is desired, the outer head 67
ding studs in any object while completely eliminating the
its contact with the spring 74 or the side of the ?ring pin
nail 65 is of the double-headed type having an inner head
71 and this permits the sear 76 to return to its normal
66 and an outer head 67 with an optional breakoff groove
position.
After the barrel 18 has moved all the way for
66a above and adjacent to the inner head. The split por
tion of the projectile 48' is recessed to receive the outer 40 ward, the cocking member 84 passes over the ?ange 72 and
the spring 85 pulls it back to its operating position illus
head and grip the shank between the outer and inner
trated in FIGS. 7 and 8.
heads. This form of stud may be used to mount a wooden
-It will be readily apparent that the stud gun described
block 68 to a concrete object 55., for example, and if no
above provides a novel and efficient device for embed~
may be broken off after the stud is embedded.
45 hazards formerly encountered in the use of such guns.
1In the embodiment shown in FIGS. 7 and 8, a trigger
actuated ?ring pin is provided to eliminate the necessity
of applying a hammer blow. In this case, the housing
14' is formed with a pistol grip 69 and a spring-biased
Moreover, an operator is effectively prevented from dis~
>abling the safety features while using the gun.
Although the invention has been described herein with
reference to speci?c embodiments, many modi?cations
trigger 70 is pivotally supported on the housing. A ?ring 50 and variations therein will readily occur to those skilled in
pin 71 having a ?ange 72 passes through an opening 73
the art. For example, the rear portion of the housing 14
in the housing and a strong compression spring 74 ex
may be hinged to the forward portion to swing open and
tends from the ?ange to the housing. In addition, a stop
permit breech loading of the gun. In this case, the plug
member 75 mounted in the housing intercepts the ?ange
38 should be easily removable from the barrel so that the
72 to limit the forward motion of the ?ring pin 71. The 55 projectile can be inserted from the rear. Accordingly,
stop member 75 is positioned with respect to the barrel
all such variations and modi?cations are included within
10 of the gun to prevent the ?ring pin 71 from contacting
the intended scope of the invention as de?ned by the fol
a cartridge in the projectile 48 when the projectile is
lowing claims.
against the inner end of the plug 38 and the barrel 10
We claim:
is in the forward position, as shown in FIG. 7. When 60
1. A drivable unit for driving a fastener through a bore
the barrel is in the cocked position illustrated in FIG. 8,
into an object comprising a piston slidable in the bore
the stop member 75 no longer prevents the forward end of
having a forward portion adapted to receive a fastener
the ?ring pin from contacting the cartridge in the projec
and provided with a hole at the opposite end adapted to
tile.
receive a ‘cartridge freely so that the cartridge is self
Pivotally mounted at the rear end of the barrel 10, a
ejecting when ?red including a passageway between the
sear 76 is shaped with an arm 77 extending toward the
hole and the forward portion and a member in the pas~
location of the trigger 78 and a dog 78 mounted on this
sageway adapted to be driven into the hole to remove a
arm is positioned between two rigid guard plates 79 and
cartridge.
80 which normally prevent motion of the arm 77 and
2. Apparatus for driving a fastener into an object
pivoting of the sear 76. One of these plates, the sear 70
comprising a piston adapted to receive at one end a fas'
guard 79, is mounted on the housing 14' and includes an
tener having a smaller diameter than the piston, barrel
opening 81 located to permit pivoting of the sear 76 only
means having a bore and a forward end for directing the
when the barrel 10 is in the rear or cocked position. The
piston and a fastener mounted therein toward the object,
other plate 80, called the trigger guard, normally pre
vents the operating arm 82 of the trigger 70‘ from mov 75 piston arresting means comprising an impact-absorbing
3,055,008
member capable of being deformed to absorb the energy
of the piston supported at the forward end of the barrel
means and projecting inwardly toward the axis of the
barrel means far enough to intercept the piston but not
far enough to prevent the fastener from passing out of
the barrel means, and releasable holding means mounted
moved forwardly with respect to the barrel means,,sear
guard means mounted on the housing and positioned to
prevent motion of the sear means ,away from the ?ring
pin intercepting position except when the housing is in
its forward position, and trigger means movably mounted
on the housing in a location to engage the sear means when
at the forward end of the barrel means and movable in
a transverse direction with respect to the barrel axis be
the housing is in the forward position.
8. Apparatus according to claim 7 including trigger
tween an inner position retaining the impact-absorbing
guard means mounted on the barrel means and positioned
member in place at the forward end of the barrel means 10 with respect to the trigger means to prevent operation
and an outer position permitting removal of the impact
thereof except when the housing is in the forward position.
absorbing member from the forward end of the barrel
9. In combination, a drivable unit for ‘driving a fas
tener into an object comprising a piston having a full di
ameter portion and a forward portion of reduced diameter
means.
3. Apparatus for driving a fastener into an object com
prising a piston adapted to receive ‘at one end a fastener 15 and longitudinally split into at least two separate sections
having a smaller diameter than the piston, barrel means
to receive the head of a fastener, each section including
having a bore and a forward end for directing the piston
part of the full diameter portion, barrel means having a
and a fastener mounted therein toward the object, piston
bore to receive the piston with a bore ‘diameter approxi
arresting means comprising an arresting member sup
ported at the forward end of the barrel means and pro
jecting inwardly toward the axis of the barrel means far
enough to intercept the piston but not far enough to pre
mating that of the full diameter‘ piston portion to retain
20 the two sections together when the piston is in the bore
and to direct the piston and fastener toward the object,
and arresting means mounted at a ‘forward end of the
barrel means and projecting toward the axis of the barrel
vent the fastener from passing out of the barrel means,
releasable holding means mounted at the forward end of
means far enough to intercept the full diameter piston
the barrel means and movable in a transverse direction 25 portion, but not far enough to intercept the reduced diam—
with respect to the barrel axis between an inner position
eter piston portion.
10. The combination according to claim 9 including
retaining the piston arresting member in place at the
forward end of the barrel means ‘and an outer position
friction means mounted on the full diameter piston portion
forming a tight ?t with the bore of the barrel means to
permitting removal of the piston arresting member from
the forward end of the barrel means, a housing surround 30 hold the piston in position in the bore.
ing the barrel means and longitudinally movable with
11. A drivable unit for driving a fastener through a bore
respect thereto ‘between a forward position and a rear
into an object comprising a piston which is longitudinally
ward position, and means linking the housing and the
split into at least two separate sections from one end over
_holding means to move the holding means to the inner
at least a portion of its length and having a diameter in
position when the housing is moved to the forward position 35 at least part of the split portion which is approximately
and ‘to the outer position when the housing is moved to
the rearward position.
the same as the diameter of the bore, the separate sections
being formed at said one end with an axial opening to
receive the head of a fastener.
4. Apparatus according to claim 3 including locking
means linking the barrel means and the housing to pre
vent motion of the housing to the forward position and
release means for the locking means including a detector
responsive to the presence of the piston arresting member
at the forward end of the barrel means to release the
locking means and permit relative motion of the housing
‘and barrel means when the piston arresting member is
in position at the forward end of the barrel means.
12. A drivable unit according to claim 11 wherein the
piston sections are formed with recesses within the hole
to retain a complementary shaped head of a fastener.
13. A ‘drivable unit according to claim 11 wherein the
piston sections are formed with internal threads within the
hole to retain a fastener having a threaded head.
45
References Cited in the ?le of this patent
5. Apparatus according to claim 3 wherein the barrel
has a Ibreech end within the housing and including means
associated with the housing for ?ring an explosive car
tridge located in the breech end of the barrel, said ?ring
means being movable with the housing form a rearward
safety position with respect to the barrel means when
the housing is in its rearward position to a forward ?ring
position with respect to the barrel means when the hous
ing is in its forward position.
6. Apparatus according to claim 5 wherein the ?ring
means comprises a ?ring pin supported in the housing for
limited motion with respect thereto toward and away
from the breech end of the barrel means and having a
length short enough to prevent contact with an explosive
cartridge in the breech end of the barrel means when
the housing is in its rearward position but long enough
to permit contact with an explosive cartridge when the
housing is in its forward position.
7. Apparatus according to claim 6 including movable 65
sear means mounted on the barrel means and normally
positioned to intercept the ?ring pin as the housing is
UNITED STATES PATENTS
46,220
2,064,503
2,632,890
2,663,259
2,724,116
2,747,187
De Witzloben _________ __ Feb. 7,
Temple _____________ __ Dec. 15,
Tietig _______________ .._ Mar. 31,
Catlin et al ___________ __ Dec. 22,
Termet _____________ __ Nov. 22,
Catlin et a1 ___________ _.. May 29,
1865
1936
1953
1953
1955
1956
2,767,398
2,770,988
2,895,135
Pfaff ________________ __ Oct. 23, 1956
Jasse _______________ __ Nov. 20, 1956
Hilti ________________ __ July 21, 1959
2,904,787
De Caro ____________ __ Sept. 22, 1959
2,923,940
2,925,602
Kvavle _______________ __ ‘Feb. 9, 1960
Kopf et al ____________ __ Feb. 23, 1960
FOREIGN PATENTS
62,135
166,735
167,800
744,822
986,345
1,031,736
France ______________ __ Dec. 29,
Australia ____________ __ Jan. 31,
Australia _____________ __ June 6,
Great Britain ________ __ Feb. 15,
France ______________ __ Mar. 21,
1954
1956
1956
1956
1951
Germany ____________ .._ June 4, 1958
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