GB1593529A - Bolt setters having a piston return mechanism - Google Patents
Bolt setters having a piston return mechanism Download PDFInfo
- Publication number
- GB1593529A GB1593529A GB5283077A GB5283077A GB1593529A GB 1593529 A GB1593529 A GB 1593529A GB 5283077 A GB5283077 A GB 5283077A GB 5283077 A GB5283077 A GB 5283077A GB 1593529 A GB1593529 A GB 1593529A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pawl
- holder
- barrel
- hammer piston
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
- B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
- B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
Description
(54) IMPROVEMENTS IN BOLT SETTERS HAVING A PISTON
RETURN MECHANISM
(71) We, SOCIETE DE
PROSPECTION ET D'INVENTIONS TECHNIQUES S P I T, a French body corporate, of Bourg-les-Valence (Drome),
France, do hereby declare the invention; for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a bolt setter with a hammer piston and provided with a pawl for returning the hammer piston in its firing position.
Bolt setters are already known in which their cocking, achieved by pressing them against the surface of the material intended for receiving the anchoring member, causes the retraction of the pawl, said pawl resuming, when the apparatus is nor more pressed, its idle position in which it engages the hammer piston during the opening of the apparatus in order to return it to its firing position.
The barrel of such apparatuses is formed with a longitudinal slot and two plane milled surfaces parallel to the barrel axis and connected through a planar ramp, the pawl of such apparatuses being slidably mounted within a pawl-holder integral with the casing, biased to its idle position by resilient means, and comprising bosses shaped for engaging the barrel milled surfaces, the operative end of the pawl projecting into the slot and being shaped so as to engage, in its idle position, the hammer piston.
The pawl being in its idle position, that is in the hammer-piston return position, its bosses engage the first milled surface closest to the barrel axis. When the apparatus is pressed against the material, the bosses slide, against the action of the resilient means, from the first milled surface to the second milled surface more remote from the barrel axis than the first one, which causes the operative end of the pawl to retract and not project any more into the barrel.
For safety reasons, the cocking of such apparatuses is achieved by pressing them onto the material intended for receiving the anchoring member. In order to facilitate the handling of the apparatus once a cartridge has been loaded, means may be provided which are arranged in such a manner as to maintain the barrel in its closed but non cocked position. Generally, the closing involves resilient means, but it requires an extra part such for instance as.a clip.
The French Patent 1 574 377 is indeed directed to an apparatus in which said extra part is eliminated. This apparatus is a bolt setter with a hammer piston and provided with a hammer piston return pawl having at least one boss formed by two planar ramps inclined in reverse directions and connected by means of a plane portion, said pawl being slidably mounted, within a pawl-holder secured to the barrel-holder of the boltsetter, between a hammer piston return position, in which the pawl is biased by a resilient means and, projecting through a longitudinal slot of the barrel into the bore of said barrel, it engages the hammer piston during the opening of the bolt setter, whereby the planar portion of the boss of the click engages a first plane milled surface provided on the barrel, and a bolt setter cocking position, in which a second plane milled surface, provided on the barrel and more remote from its axis than the first one, engages said plane portion for retracting the pawl, said two milled surfaces -being connected by means of a transverse groove having a plane bottom which the plane portion of the boss of the pawl is intended to engage for maintaining the barrel in its closed but non cocked position and which is connected to the second milled surface by means of a first inclined planar ramp for engaging one of said two inclined planar ramps of the boss of the pawl, in which the plane bottom of the transverse groove is connected to the first milled surface through a shoulder for engaging the other of said inclined planar ramps of the boss of the pawl.
Owing to the apparatus according to the
French Patent 1 574 377, the return of the hammer piston during the opening of the apparatus, and the maintaining of the barrel in its closed position before cocking of the apparatus, are achieved without the help of an extra part. When the apparatus is pressed onto the material intended for receiving the anchoring member, the barrel-holder, and by way of consequence the pawl, are brought forward in relation to the barrel; against the action of the biasing means of the pawl, the first inclined ramp of the transverse groove of the barrel engages the first inclined ramp of the boss of the pawl for pushing the pawl outside the barrel bore, whereby the plane portion of the boss of the pawl engages the second milled surface of the barrel.After firing, when the apparatus is no more pressed against the material, the barrel-holder slides rearwardly in relation to the barrel, and the plane portion of the boss of the pawl is disengaged from the second milled surface, whereby the pawl returns to seat within the transverse groove of the barrel which is thus resiliently re-locked.
Nevertheless, this re-locking is not very safe, since the resistance of the edge of the shoulder of the transverse groove of the barrel to the second inclined ramp of the boss of the pawl is not sufficient for avoiding certain unexpected displacements causing the opening of the apparatus.
The primary object of the present invention is, therefore, to improve the safety of such a locking device.
According to the invention, there is provided a bolt setter of the kind specified, which is characterized in that said plane bottom of the transverse groove is connected to said first milled surface by means of a second planar ramp inclined in a direction reverse to that of said first planar ramp of the transverse groove for engaging the other of said two inclined planar ramps of the boss of the pawl.
In the bolt setter of the invention, the engagement between the transverse groove of the barrel and the second inclined ramp of the boss of the pawl, upon an unexpected displacement of the barrel towards the front end of the apparatus, is achieved through a larger contact surface, because of the substitution of the edge of the shoulder by a second inclined ramp, which improves the re-locking safety, a voluntary opening of the apparatus being none the less possible.
The relative movement of the barrel and the pawl of conventional bolt setters may offer the disadvantage of an eventual faulty mounting of the pawl in its click-holder whereby the barrel may be held in its cocked position, thus rendering ineffective the cocking safety requirement of pressing the apparatus against a material.
A further object of the present invention
is therefore to remedy such a disadvantage.
To this effect, the pawl and the pawl-holder
may be arranged in order to form at least
one recess, orientation means being provided for cooperating with said recess and guiding the pawl in the pawl-holder.
If the pawl is wrongly introduced into the pawl-holder, said means cannot therefore
cooperate with the recess and they prevent the pawl from being introduced further into the pawl-holder in such a manner that no action applied on the pawl may bring it into engagement with the barrel of the apparatus according to the invention.
It may also be foreseen, still in order to ensure safety, and for instance in the case where the pawl is mounted in reverse direction, that the pawl has a length such that a closure cap of the pawl-holder cannot be secured to the latter if the pawl is not completely and therefore correctly put in position in the pawl-holder.
A further object of the present invention is to provide the pawl with a third function in relation with the evacuation of the combustion wastes. In some conventional bolt setters, it is a fact that no particular means are foreseen for allowing such an evacuation, only a minute part having the possibility to get out through the barrelholder, so that the combustion wastes accumulate in the forward portion of the barrel of such apparatus which become very quickly dirty.
In the case where the hereabove
mentioned recess is formed in the bolt
setter of the invention, said recess may
therefore extend in such a manner as to
form a passage duct for the gases and
combustion wastes. Such a passage duct
offers therefore the advantage of allowing
wastes which accumulate against the pawl
to be evacuated outside.
Finally, a last object of the invention
relates to over-power firing. After such an
over-power firing, the hammer piston
protrudes outside of the forward portion of
the apparatus and its rearward end may
extend past the pawl which cannot assume
any more its return function. With
conventional bolt setters, it is in such a case
necessary to dismantle them in order to "re
cock' the pawl, that is to position again the
rearward end of the hammer piston behind
the pawl. The object of the invention is therefore to remedy such a disadvantage
and relates to this effect to a bolt setter in which the rearward end of the hammer piston head is formed with a bevelled edge
in such manner that when the hammer
piston is urged back by its forward end
which protrudes outside of the apparatus,
said hammer piston may retract the pawl
against the action of its biasing means until
it resumes a position ahead of the operative part of the hammer piston, and this without having to dismantle the apparatus of the
invention.
The invention will become more apparent from the following description of a preferred embodiment of the apparatus of the invention, with reference to the accompanying drawing wherein:
Fig. 1 is an axial cross-sectional view of an
apparatus of the invention, in closed
position, after loading;
Fig. 2 shows at a larger scale, the pawl of
Fig.I in its three barrel engaging positions;
Fig. 3 is a transverse cross-sectional view
of the apparatus of the invention, taken along the line III--III of Fig. 1;
Fig. 4 is an axial cross-sectional view of the apparatus of the invention, in closed
position after an over-power firing;
Fig. 5 is a view similar to that of Fig. 4,
after an over-power firing, when the
apparatus is open;
Fig. 6 is a transverse cross-sectional view
of the- pawl and the pawl-holder, along line VI-VI of Fig. 4, and
Fig. 7 shows a series of axial cross
sectional views of the pawl in various
positions in the pawl-holder.
Figure 1 shows apparatus 1 according to the invention having its barrel 2 formed with
a longitudinal slot 3 parallel to its axis. The
barrel-holder 4 of apparatus 1 is integral
with a pawl-holder 5 within which is slidably
mounted a pawl 6 for returning the hammer
piston 7 of apparatus 1, and closed by a cap
40 for maintaining pawl 6. Two plane milled surfaces 8 and 9 have been provided on barrel 2 and are connected through a transverse groove 10, having a plane bottom
10' connecting two planar ramps 20 and 21
inclined in reverse directions.Pawl 6, whose
operative end 11 is formed for engaging
head 70 of hammer piston 7 when said end
protrudes outside of slot 3, comprises two
bosses 12 symmetrical in relation with its
axis, each having a plane portion 12'
connecting two planar ramps 12" and 12"'
inclined in reverse directions, and intended
for engaging the milled surfaces 8, 9 and the
transverse groove. 10 of barrel 2 of apparatus
1. Pawl 6 is biassed to the hammer piston
return position by a spring 13 bearing
against cap 40 and the bottom of a blind
bore 41 formed inside pawl 6.
The operating of apparatus 1 is illustrated
in Figs. 2. Fig. 2A shows pawl 6 in pawl
holder 5 in its upward position, for returning
hammer piston 7, not shown, to its initial
position, plane portion 12' of the bosses 12
bearing on the milled surface 8 of barrel 2.
This respective position of pawl 6 and
hammer piston 7 is achieved in particular
during the opening of apparatus 1 where the
barrel 2 moves forward in relation to the
barrel-holder 4. Fig. 2B shows the pawl, the
r
apparatus bearing on the material intended
for receiving an anchoring member, in its
cocked position. While the apparatus is
pressed onto the material, which action
brings forward the barrel-holder 4 in
relation to barrel 2, plane portions 12' are
disengaged from the milled surface 8 and
are urged to engage, first, under the action
of spring 13, plane bottom 10' of the groove
10, and, then, the milled surface 9 more
remote from the axis of barrel 2 than the
milled surface 8, when the engagement of
ramp 21 of the groove 10 with the ramps 12"
of the pawl 6 has pushed the pawl 6 against
the action of spring 13.The engagement of
the milled surface 9 with the plane portions
12' of the bosses 12 retracts therefore the
operative end 11 of the pawl 6 which does
not protrude any more inside the bore of the
barrel.
Fig. 2C shows the pawl, the apparatus
being closed, the plane portions 12' of the
bosses 12 of pawl 6 - engaging the plane
bottom 10' of groove 10. In this position of
pawl 6, barrel 2 of apparatus 1 is resiliently
locked. As a matter of fact, from said
position and in order to be able to cock
apparatus I by pressing it against the
material intended for receiving the
anchoring member, the force of the biasing
spring 13 of pawl 6 has to be counteracted in
order to slide the ramps 12" of its bosses 12
along ramp 21, before plane portions 12' of
bosses 12 engage, in the cocked position of
apparatus 1, the milled surface 9, in which
position pawl 6 is retracted.It is also
necessary to counteract the force of the
same biasing spring 13 in order to slide the
ramp 12"' of bosses 12 of pawl 6 in reverse
direction along ramp 20, before plane
portions 12' of bosses 12 engage the milled
surface 8, in the open position of apparatus
1, (shown in Fig. 2A) in which the pawl can
engage head 70 of hammer piston 7. When
after firing the apparatus is no more pressed
against the material, the barrel-holder 4
slides rearwardly in relation to barrel 2,
bosses 12 of pawl 6 protruding again inside
the transverse groove 10 of barrel 2, which is
therefore automatically relocked.
Pawl 6 is formed with two flat parts 30 and
31, symmetrical in relation to its axis and
orthogonal to bosses 12, which provide,
between pawl 6 seated inside pawl-holder 5,
cylindrical in the embodiment shown on the
drawing, and the inner wall of pawl-holder
5, two ducts 32, 33 provided for orienting
pawl 6 inside pawl-holder 5 and evacuating
the combustion wastes. Cap 40 is also
formed with two passages 42, 43,
corresponding to ducts 32, 33 through which
the gases and combustion wastes may be
evacuated.
The cylindrical general shape of pawl 6
and pawl-holder 5 shown in the drawing should not be considered as limitative for the invention. Other milled surfaces than flat parts, as for instance grooves or even bores, may also be considered for the evacuation of the gases through the pawls and pawl-holders, for instance parallelepipedal. It could also have been possible not to form the flat parts 30 and 31 along the whole length of pawl 6, and to provide only two blind recesses, therefore not shown in the drawing, provided only for orienting pawl 6 inside the pawl-holder 5 which is discussed herebelow, without therefore allowing the evacuation of the combustion wastes.
Figs. 7 show the different positions of pawl 6 in pawl-holder 5. In Fig. 7A pawl 6 is in a correct position and a pin 50 protruding inside the pawl-holder 5 with which it is integral, can very well engage the flat part 31 of pawl 6. Furthermore, the length of pawl 6 is such that cap 40 is completely screwed on the pawl-holder 5. Finally, a second pin 51 is seated in the blind bore of 41 of pawl 6. On the contrary, Fig. 7B shows a position in which pawl 6 is introduced in the pawl-holder after rotating at 900 in relation with its position of Fig. 7A: the upper end of one of the bosses 12 comes in abutment against pin 50 and taking in account the length of the pawl, it is not possible to screw cap 40 onto pawl-holder 5.
Fig. 7C shows a position in which pawl 6 is introduced in reverse direction in relation to that of Fig. 7A: the pin 50 can still engage the flat part 32, but the pin 51 comes in abutment against end 11 of pawl 6 which is not formed with a bore and, although pawl 6 is already sufficiently introduced, it is still not possible, taking its length in account, to screw cap 40 onto pawl-holder 5. Fig. 7D shows a position in which pawl 6 is introduced in reverse direction to that of
Fig. 7B: the pin 50 against which one of the bosses 12 comes in abutment, as well as the pin 51, which comes in abutment against end 11 of pawl 6, and the length of the latter prevent cap 40 from being screwed onto pawl-holder 5. The securing of cap 40 onto pawl-holder 5 by screwing is of course non limitative of the invention.
If therefore pawl 6 is wrongly introduced into pawl-holder 5, it is impossible to displace it and maintain it in engagement with barrel 2 of apparatus 1, which avoids the possibility of holding barrel 2 in its cocked position.
Head 70 of hammer piston 7 is formed at its rearward end with a bevelled edge 60.
After an over-power firing, as shown in Fig.
4, head 70 has assumed a position preventing, when the apparatus is opened, the return of pawl 6 to its cooperation position with the forward part of head 70.
This opening causes head 70 to pass ahead of pawl 6; pawl 6, under the action of spring
13, is then biased to its idle position in which the end 11 protrudes inside the barrel bore 2 as shown in Fig. 5. The forward end of the hammer piston 7 protruding then outside of the apparatus, it is easy to push back said forward end of the hammer piston. During the rearward movement of hammer piston 7, and owing to bevelled edge 60, the rearward end of head 70 does not come any more in abutment against head 11 of pawl 6, but on the contrary retracts again pawl 6, against the action of spring 13, which may be urged again ahead of head 70. The apparatus I of the invention is therefore arranged in order to be able, after an overpower firing, to recock pawl 6 without having to dismantle the apparatus of the invention.This arrangement provides also the possibility to reassemble the apparatus without taking in account the relative position of the hammer piston head and the pawl.
WHAT WE CLAIM IS:
1. A bolt setter with a hammer piston and provided with a hammer piston biasing pawl having at least one boss formed by two planar ramps inclined in reverse directions and connected by means of a plane portion, said pawl being slidably mounted, within a pawl-holder secured to the barrel-holder of the bolt setter, between a hammer piston return position, in which the pawl is biased by a resilient means and, projecting through a longitudinal slot of the barrel into the bore of said barrel, it engages the hammer piston during the opening of the bolt setter, whereby the planar portion of the boss of the pawl engages a first plane milled surface provided on the barrel, and a bolt setter cocking position, in which a second plane milled surface, provided on the barrel and more remote from its axis than the first one, engages said plane portion for retracting the pawl, said two milled surfaces being connected by means of a transverse groove having a plane bottom which the plane portion of the boss of the pawl is intended to engage for maintaining the barrel in its closed but non cocked position and which is connected to the second milled surface by means of a first inclined planar ramp for engaging one of said two inclined planar ramps of the boss of the pawl, the bolt setter being characterized in that said plane bottom of the transverse groove is connected to said first milled surface by means of a second planar ramp inclined in a direction reverse to that of said first planar ramp of the transverse groove for engaging the other of said two inclined planar ramps of the boss of the pawl.
2. A bolt setter according to claim 1, wherein the pawl and the pawl-holder are
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A bolt setter with a hammer piston and provided with a hammer piston biasing pawl having at least one boss formed by two planar ramps inclined in reverse directions and connected by means of a plane portion, said pawl being slidably mounted, within a pawl-holder secured to the barrel-holder of the bolt setter, between a hammer piston return position, in which the pawl is biased by a resilient means and, projecting through a longitudinal slot of the barrel into the bore of said barrel, it engages the hammer piston during the opening of the bolt setter, whereby the planar portion of the boss of the pawl engages a first plane milled surface provided on the barrel, and a bolt setter cocking position, in which a second plane milled surface, provided on the barrel and more remote from its axis than the first one, engages said plane portion for retracting the pawl, said two milled surfaces being connected by means of a transverse groove having a plane bottom which the plane portion of the boss of the pawl is intended to engage for maintaining the barrel in its closed but non cocked position and which is connected to the second milled surface by means of a first inclined planar ramp for engaging one of said two inclined planar ramps of the boss of the pawl, the bolt setter being characterized in that said plane bottom of the transverse groove is connected to said first milled surface by means of a second planar ramp inclined in a direction reverse to that of said first planar ramp of the transverse groove for engaging the other of said two inclined planar ramps of the boss of the pawl.
2. A bolt setter according to claim 1, wherein the pawl and the pawl-holder are
arranged in such manner as to form at least one recess, orienting means being provided for cooperating with said recess and orienting the pawl inside the pawl-holder.
3. A bolt setter according to claim 2, wherein the recess extends in such manner as to form a passage duct for the gases and combustion wastes.
4. A bolt setter according to any of claims 2 and 3, wherein the recess wall is formed by a milled surface provided on the pawl and by the inner wall of the pawlholder.
5. A bolt setter according to any of claims
I to 4, wherein a pin integral with a closure cap for the pawl-holder is arranged in such manner as to be seated in a blind bore formed inside the pawl.
6. A bolt setter according to claim 5, wherein the length of the pawl is such that said closure cap cannot be secured onto the pawl-holder when the pawl is not in a correct position within the pawl-holder.
7. A bolt setter according to any one of claims I to 6, wherein the rearward end of the hammer piston head is formed with a bevelled edge for retracting the pawl.
8. A bolt setter substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7639435A FR2375958A1 (en) | 1976-12-29 | 1976-12-29 | IMPROVEMENTS TO MASSELOTTE SEALING DEVICES AND MASSELOTTE RECALL RATCHET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1593529A true GB1593529A (en) | 1981-07-15 |
Family
ID=9181680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5283077A Expired GB1593529A (en) | 1976-12-29 | 1977-12-19 | Bolt setters having a piston return mechanism |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT361878B (en) |
| BE (1) | BE861774A (en) |
| DE (1) | DE2756785A1 (en) |
| ES (1) | ES465522A1 (en) |
| FR (1) | FR2375958A1 (en) |
| GB (1) | GB1593529A (en) |
| IT (1) | IT1116395B (en) |
| SE (1) | SE7714824L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1220302A (en) * | 1983-05-24 | 1987-04-14 | Harry M. Haytayan | Powder-actuated fastener-driving tool |
| DE3605832A1 (en) * | 1986-02-22 | 1987-08-27 | Hilti Ag | POWDER POWERED SETTING DEVICE |
-
1976
- 1976-12-29 FR FR7639435A patent/FR2375958A1/en active Granted
-
1977
- 1977-12-12 BE BE183387A patent/BE861774A/en unknown
- 1977-12-19 GB GB5283077A patent/GB1593529A/en not_active Expired
- 1977-12-20 DE DE19772756785 patent/DE2756785A1/en not_active Withdrawn
- 1977-12-27 AT AT931877A patent/AT361878B/en active
- 1977-12-28 ES ES465522A patent/ES465522A1/en not_active Expired
- 1977-12-28 IT IT5239277A patent/IT1116395B/en active
- 1977-12-28 SE SE7714824A patent/SE7714824L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| BE861774A (en) | 1978-03-31 |
| ATA931877A (en) | 1980-08-15 |
| ES465522A1 (en) | 1978-09-16 |
| FR2375958A1 (en) | 1978-07-28 |
| SE7714824L (en) | 1978-06-30 |
| AT361878B (en) | 1981-04-10 |
| IT1116395B (en) | 1986-02-10 |
| FR2375958B1 (en) | 1982-02-26 |
| DE2756785A1 (en) | 1978-07-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |