GB1566620A - Creation of Inventions and Patents with Artificial Intelligence

GB1566620A – Fastener driving tool
– Google Patents

GB1566620A – Fastener driving tool
– Google Patents
Fastener driving tool

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Publication number
GB1566620A

GB1566620A
GB18816/77A
GB1881677A
GB1566620A
GB 1566620 A
GB1566620 A
GB 1566620A
GB 18816/77 A
GB18816/77 A
GB 18816/77A
GB 1881677 A
GB1881677 A
GB 1881677A
GB 1566620 A
GB1566620 A
GB 1566620A
Authority
GB
United Kingdom
Prior art keywords
barrel
cartridge
ram
conical
driving tool
Prior art date
1976-05-06
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

Application number
GB18816/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Individual

Original Assignee
Individual
Priority date (The priority date 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 date listed.)
1976-05-06
Filing date
1977-05-05
Publication date
1980-05-08

1977-05-05
Application filed by Individual
filed
Critical
Individual

1980-05-08
Publication of GB1566620A
publication
Critical
patent/GB1566620A/en

Status
Expired
legal-status
Critical
Current

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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

B25C1/143—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil trigger operated

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

PATENT SPECIFICATION
( 11) 1 566 620 ( 21) Application No 18816/77 ( 22) Filed 5 May 1977 ( 31) Convention Application No.
7 613 552 ( 32) Filed 6 May 1976 in ( 33) France (FR) ( 44) Complete Specification published 8 May 1980 ( 51) INT CL 3 B 25 C 1/14 ( 52) Index at acceptance B 4 C 103 B 3 ( 54) FASTENER DRIVING TOOL ( 71) I, PIERRE TERMET of 16, Impasse Belloeuf 69391 Lyon France, a French Citizen, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:-
This invention relates to fastener driving apparatus activated by a powder charge, such as a sealing apparatus using nails or pegs, or bolt firing apparatus, or any other type of apparatus wherein propulsion is provided by a powder charge to a ram or driving piston, contained within a barrel, which ram propels or hits a component such as a sealing peg, nail, bolt or the like.
There already exist several known variants of such apparatus wherein the rams are of varying weights and propulsion speeds.
In general, the weakest part of this type of apparatus is the ram, which in use is subjected to the greatest stress since it bears high impact and compression loads After a while, this gives rise to a real danger of the component fracturing Such a fracture requires the replacement of the ram and this can be relatively costly and can maintain the apparatus out of service for some time.
Moreover, the fracture may be dangerous, since at least part of the ram may be ejected from the gun and may cause accidents.
An object of this invention is to provide apparatus of this type where, should a fracture occur, the possibility of dangerous ejection of part of the ram is avoided or at least reduced.
According to this invention, there is provided a cartridge-actuated fastener driving tool including, a slidable assembly comprising a barrel, a muzzle at one end of said barrel, a cartridge chamber at the other end of said barrel, and a breech-block and percussion means for exploding a cartridge located at the end of said chamber remote from said barrel, a driving piston slidably mounted in said slidable assembly for actuation by the gases produced by an explosing in said cartridge chamber to eject a fastener from said muzzle, and 50 a tubular casing, within which said slidable assembly is mounted for axial sliding movement, and having a handle with a trigger mounted on the casing near one end thereof, 55 said driving piston comprising a head portion and a shank portion, said shank portion having at least at its forward end a frusto-conical abutting surface formed thereon for engaging a corresponding frusto 60 conical abutting surface formed thereon for engaging a corresponding frusto-conical abutting surface formed on said slidable assembly for retaining a substantial part of said driving piston therein in case of break 65 age of said piston, characterized in that said frusto-conical surfaces have a conicity of less than 3 % By ‘conicity’ is meant the change in radius per unit axial length, expressed as a percentage 70 In accordance with preferred features of the invention an arrangement of the ram is provided which considerably reduces the risk of a fracture, the ram is automatically withdrawn to its firing position, and improved 75 means of driving home sealing components such as pegs or nails are provided.
Thus, in one construction of said apparatus the ram shaft which extends from the rear head of the ram is in the form of a truncated 80 cone over a substantial part of its length.
The ram shaft may be of truncated conical shape over its entire length, or it may incorporate one or more cylindrical sections combined with one or more truncated conical 85 sections.
A further preferred feature provides a connecting section between the ram head and shaft which has a parabolic taper.
To ensure that, once it has been fired, the 90 2 1 566 620 ram is returned to its intial rear position an elastomer shock-absorber may be provided for co-operating with a conical section of the ram shaft and also, if provided, preferably with the parabolic connecting section of the ram Thus, the shock-absorber is compressed when the ram reaches its maximum forward position, where after it expands and propels the ram backwardly to its initial position.
Vents or pressure equalizing devices may be provided in the barrel, enabling the ram to be returned by the shock-absorber to its initial position without a braking effect from air being compressed behind the rear head of the ram.
To maintain the ram in its initial position until the next firing, suitable means may be provided, for example a slightly conical section at the rear of the barrel which is held by wedging action on a similar truncated conical section on the rear head of the ram.
Further advantages and features of the invention will become apparent from the following description of an exemplary embodiment and variant of impacting apparatus and with reference to the accompanying drawings in which:
Figure 1 is a cross-section along the axis of the embodiment, -Figure 2 is a sectional view of a part of Figure 1 showing the ram in its rearmost position, and Figure 3 is a fragmentary sectional view of a variant.
The embodiment of impacting apparatus shown in Figure 1 is a fastener driving gun consisting of a handle/firing mechanism unit 1, a slidable barrel/firing chamber unit 2 and a casing 3 containing the slidable unit 2 which, by means of a well-known method, enables the unit 2 to be separated from the unit 1 for the chamber to be reloaded.
The handle/mechanism unit 1 consists of the handle 4, a hinged trigger 5, a springbiassed striker weight 6, a safety device 7 of any well-known type and, on the trigger 5, a small fork-shaped component 8 which may come into contact with a stud 9 when the latter is moved rearwardly.
As can be seen, the stud 9 forms part of a slidable component 10 which provides an upper stop surface to prevent the weight 6 from being propelled forwardly by its spring.
The casing 3 consists of a bush 11 held within the unit 1 and having a vertical hinge formed of two pivot pins 12 which project through a second bush 13, a sleeve 14 connected to the front of the bush 13 and, connected to front of the sleeve 14 by means of nut 15, an elongated tubular component 16.
The slidable unit 2 comprises a rear part 17 with an extension rod 18 for contacting the safety device 7 in a known manner, and having in its lower portion a transverse bore in which component 10 is slidably mounted.
The rear part 17 is connected to a breech 18 a which is of annular form and which has a striking pin 19 arranged to be activated by 70 the weight 6 To the front end of the breech 18 a is located a part 20 which forms the firing chamber 21 An elongated bush 22 is screwed to the part 20 within which is located a barrel 23 As can be seen, the barrel 75 has a truncated slightly conical rear section 24 which becomes narrower towards its rear within the part 20, and vents 25 are provided in the wall of the barrel forward of the conical section 24 Moreover, it can be seen that 80 the barrel can be adjusted closed to part 20 via mating threads on the barrel and the bush 22, by appropriate rotation so as to adjust the power of the gun.
The barrel 23 has an inner bore 26 which 85 comprises a relatively large diameter cylindrical space, which is extended by a wall containing an elastomer shock-absorber 27 which has more or less the shape of a sleeve.
At the front end of the barrel is an end 90 fitting 28, which is connected to various components making up an assembly 29, and a part of which protrudes beyond the tubular component 16, the part in question being chamfered at its outer end 30 The bore 26 95 is extended into the end-fitting 28 via a further bore 31 of smaller diameter and which slightly resembles a truncated cone which tapers to the outer end 30.
It should be understood that, having trig 100 gered the safety device, pressure is brought to bear on the front surface of end fitting 28, and the entire unit 2 slides backwards within the casing 3.
The extent of this movement depends par 105 ticularly on the angle at which the gun is applied against the wall which is to receive the peg It should especially be noted that, if the gun is applied perpendicularly to this wall, the end fitting 28 may be pushed fully 110 into the casing component 16 If, on the other hand, the angle between the gun and the wall face exceeds an upper limit for the firing angle (selected for reasons of safety) the end fitting 28 will not be completely 115 pushed back into components 16, which will be bearing on the wall, and the slidable unit 2 will be prevented from being fully depressed and will act to prevent further firing taking place When the unit 2 is fully 120 depressed, the stud 9 will engage within the teeth of the fork of component 8 and it will then be possible, by pressing the trigger 5, for the component 10 to slide downwardly, thus freeing the weight 6 to initiate percus 125 sion and explosion.
A ram 32 is free to move inside the bore of the barrel and it has a large diameter rear head 33 which is provided with a truncated conical part 34 to co-operate with the 130 1 566 620 bearing surface provided by the truncated conical section 24 of the barrel Moreover, the head 33 is extended rearwardly by a small diameter part 35 which also has the form of a truncated cone and which allows for some channeling of gases and the partial blocking of the chamber 21 The head 33 is extended forwardly by a section 36 which has a parabolic taper and which, without breaking its continuity, is further extended by a slightly conical shaft portion 37 whose diameter decreases towards its outer end 38.
It should be understood that, at the time of firing, the ram 32 is propelled forwardly and is centred, at its rear end, within the bore 26 of the barrel and, at its forward end, by moving into the bore 31.
Figure 2 shows the extreme forward position of the ram 32 and it can be seen that, in this position, its end 38 protrudes slightly beyond the end fitting 28 It can be seen, moreover, that the surface of the shaft 37 comes into contact with the defining surface of the bore 31, which is also in the form of a truncated cone and tapers towards its front end Thus, it is impossible for the ram to be ejected, especially in the event of a fracture of the ram 32 Moreover, the head 33 and the parabolic tapering section 36 bury themselves into the shock-absorber sleeve 27 which is shifted forwardly and compressed against the assembly 29 as shown in Figure 2 It can be seen that at the end of the firing operation, the shocke-absorber sleeve 27 by expanding, acts on the parabolic section 36 and on the conical shaft portion 37, whereby pushing the ram 32 rearwardly With the ram 32 having thus been pushed back, the conical chamfer 34 thereof comes into contact with its bearing surface provided by the section 24 at the rear end of the barrel 23 and the head 32 is fixed in this rearward position because of the wedging action of the conical surfaces The bore of the shockabsorber shown in the drawing is tapered, but it is clear that it could be also cylindrical for engaging a corresponding cylindrical surface of the ram.
It can, moreover, be appreciated that if there is a fracture of the ram 32, the shaft 37 will remain wedged in the gun, since it is held by the conical interior surface of the bore 31 It cannot therefore eject out the gun together with the peg, in contrast with known guns in which the ram shafts may well eject from the gun if a fracture occurs, and may cause wounds because of their kinetic energy and consequent ejection speed.
Moreover, in apparatus according to the invention, the ram shows a surprising resist 60 ance to wear with a consequent useful life superior to that of rams of existing apparatus.
As a matter of fact, upon the driving of fasteners into a support material, pressure forces are exerted either by the fasteners on 65 the forward end 38 on the driving piston, when the support material is very hard, or by the shock-absorber on the head portion 33 of the piston, when the support material is a soft material Experience has shown that 70 the conical shape of the ram shaft enables wear resistance to be increased significantly.
This resistance becomes still more marked given a noticeably parabolic connection between the shaft and the head 75 Referring to Figure 3, in a variant of the apparatus the shaft of the ram has a cylindrical section 41 projecting from the parabolic tapering section 36 and terminating in a relatively long conical section 42 adapted 80 to co-operate with a conical interior surface of a bore extending through an end fitting 43 which is similar to the end fitting 28 discussed above.
Although the invention has been described 85 for particular embodiments and variants thereof, other variants and modifications may be made within the scope of the follow-

Claims (2)

ing Claims.
WHAT I CLAIM IS: 90 1 Cartridge-actuated fastener driving tool including:
-a slidable assembly comprising a barrel, a muzzle at one end of said barrel, a cartridge chamber at the other end of said 95 barrel, and a breech-block and percussion means for exploding a cartridge located at the end of said chamber remote from said barrel, a driving piston slidably mounted in 100 said slidable assembly for actuation by the gases produced by an explosion in said cartridge chamber to eject a fastener from said muzzle, and a tubular casing, within which said 105 slidable assembly is mounted for axial sliding movement, and having a handle with a trigger mounted on the casing near one end thereof; said driving piston comprising a head 110 1 566 620 portion and a shank portion, said shank portion having at least at its forward end a frusto-conical abutting surface formed thereon for engaging a corresponding frustoconical abutting surface formed on said slidable assembly for retaining a substantial part of said driving piston therein in case of breakage of said piston, characterized in that said frusto-conical surfaces have a conicity of less than 3 %.

2 Cartridge-actuated fastener driving tool according to Claim 1, wherein said frustoconical abutting surface of said shank portion extends over a substantial part of its length 15 3 Cartridge-actuated fastener driving tool, arranged and adapted to operate substantially as hereinbefore described with reference to the accompanying drawings.
SOMMERVILLE & RUSHTON Chartered Patent Agents 89 St Peter Street, St Albans, Herts, A Ll 3 EN.
Printed for Her Majesty’s Stationery Office by The Tweeddale Press Ltd, Berwick-upon-Tweed, 1980 Published at the Patent Office, 25 Southampton Buildings, London, WC 2 A l AY, from which copies may be obtained

GB18816/77A
1976-05-06
1977-05-05
Fastener driving tool

Expired

GB1566620A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

FR7613552A

FR2350176A1
(en)

1976-05-06
1976-05-06

APPARATUS ACTIVATED BY A POWDER CHARGE

Publications (1)

Publication Number
Publication Date

GB1566620A
true

GB1566620A
(en)

1980-05-08

Family
ID=9172767
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB18816/77A
Expired

GB1566620A
(en)

1976-05-06
1977-05-05
Fastener driving tool

Country Status (9)

Country
Link

US
(1)

US4134527A
(en)

AU
(1)

AU512981B2
(en)

BE
(1)

BE854308A
(en)

CA
(1)

CA1073601A
(en)

DE
(1)

DE2720186C3
(en)

ES
(1)

ES458512A1
(en)

FR
(1)

FR2350176A1
(en)

GB
(1)

GB1566620A
(en)

IT
(1)

IT1084493B
(en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4332340A
(en)

1980-05-15
1982-06-01
Olin Corporation
Piston tool buffer assembly

US4492329A
(en)

1981-11-18
1985-01-08
International Telephone And Telegraph Corporation
Powder actuated tool

US4487353A
(en)

1981-11-18
1984-12-11
International Telephone And Telegraph Corporation
Powder actuated tool

DE3418238A1
(en)

1984-05-16
1985-11-21
Hilti Ag, Schaan

POWDER POWERED SETTING DEVICE

DE4015449A1
(en)

1990-05-14
1991-11-21
Hilti Ag

POWDER POWERED SETTING DEVICE

DE4222961A1
(en)

1992-07-13
1994-01-20
Hilti Ag

Powder-powered setting tool

US5617925A
(en)

1995-06-05
1997-04-08
Sencorp
Assembly for decelerating a driver in a tool

DE19532411A1
(en)

1995-09-01
1997-03-06
Hilti Ag

Powder-powered setting tool

AUPN585495A0
(en)

1995-10-09
1995-11-02
Ramset Fasteners (Aust.) Pty. Limited
Power actuated tools with power adjustment means

DE19635312A1
(en)

1996-09-02
1998-03-05
Hilti Ag

Setting tool

DE19755730A1
(en)

1997-12-15
1999-06-17
Hilti Ag
Compressed gas operated bolt fixing gun

US6092710A
(en)

1998-06-09
2000-07-25
Berner Gmbh
Explosive powder charge operated bolt-setting tool

DE19947464A1
(en)

1999-10-02
2001-04-05
Hilti Ag

Bolt-setting device for driving bolts or the like into components

DE10105886C2
(en)

2001-02-09
2002-12-05
Hilti Ag

piston holder

DE10105881B4
(en)

2001-02-09
2004-01-15
Hilti Ag

piston holder

DE10254964B4
(en)

2002-11-26
2014-02-13
Hilti Aktiengesellschaft

setting tool

DE10341821B4
(en)

2003-09-09
2012-03-01
Hilti Aktiengesellschaft

setting tool

DE10358576A1
(en)

2003-12-15
2005-07-28
Hilti Ag

Internal combustion setting device

DE10358578A1
(en)

2003-12-15
2005-07-14
Hilti Ag

Internal combustion setting device

WO2023069151A1
(en)

2021-10-22
2023-04-27
Esslinger Dan
Golf balls with kinetic projectiles

Family Cites Families (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3115637A
(en)

1961-08-11
1963-12-31
Olin Mathieson
Explosive actuated fastener driving tools

US3348751A
(en)

1965-08-02
1967-10-24
Olin Mathieson
Power operated piston tool

FR2211867A5
(en)

1972-12-26
1974-07-19
Termet Pierre

US3915242A
(en)

1974-05-14
1975-10-28
Star Expansion Ind Corp
Fastener driving power tool

1976

1976-05-06
FR
FR7613552A
patent/FR2350176A1/en
active
Granted

1977

1977-05-02
US
US05/792,605
patent/US4134527A/en
not_active
Expired – Lifetime

1977-05-05
CA
CA277,780A
patent/CA1073601A/en
not_active
Expired

1977-05-05
GB
GB18816/77A
patent/GB1566620A/en
not_active
Expired

1977-05-05
BE
BE177312A
patent/BE854308A/en
unknown

1977-05-05
IT
IT23229/77A
patent/IT1084493B/en
active

1977-05-05
ES
ES458512A
patent/ES458512A1/en
not_active
Expired

1977-05-05
DE
DE2720186A
patent/DE2720186C3/en
not_active
Expired

1977-05-06
AU
AU24977/77A
patent/AU512981B2/en
not_active
Expired

Also Published As

Publication number
Publication date

CA1073601A
(en)

1980-03-18

BE854308A
(en)

1977-11-07

AU512981B2
(en)

1980-11-06

FR2350176A1
(en)

1977-12-02

IT1084493B
(en)

1985-05-25

AU2497777A
(en)

1978-11-09

DE2720186B2
(en)

1979-12-13

FR2350176B1
(en)

1981-08-28

US4134527A
(en)

1979-01-16

DE2720186C3
(en)

1980-08-21

DE2720186A1
(en)

1977-11-17

ES458512A1
(en)

1978-04-01

Contact information