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1. WO1996039285 - PROPELLANT CHARGE STRUCTURE FOR GENERATING GASES TO PROPEL AN OBJECT FROM A TOOL

Publication Number WO/1996/039285
Publication Date 12.12.1996
International Application No. PCT/US1996/008389
International Filing Date 03.06.1996
IPC
B25C 1/16 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; HANDLES FOR HAND IMPLEMENTS; WORKSHOP EQUIPMENT; MANIPULATORS
CHAND-HELD NAILING OR STAPLING TOOLS; MANUALLY-OPERATED PORTABLE STAPLING TOOLS
1Hand-held nailing tools; Nail feeding devices therefor
08operated by combustion pressure
10generated by detonation of a cartridge
16Cartridges specially adapted for impact tools; Cartridge-and-nail units
C06B 45/14 2006.01
CCHEMISTRY; METALLURGY
06EXPLOSIVES; MATCHES
BEXPLOSIVE OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
45Compositions or products which are defined by structure or arrangement of component or product
12having contiguous layers or zones
14a layer or zone containing an inorganic explosive or an inorganic thermic component
CPC
B25C 1/166
BPERFORMING OPERATIONS; TRANSPORTING
25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
CHAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
1Hand-held nailing tools
08operated by combustion pressure
10generated by detonation of a cartridge
16Cartridges specially adapted for impact tools; Cartridge and bolts units
166Pellets
C06B 45/14
CCHEMISTRY; METALLURGY
06EXPLOSIVES; MATCHES
BEXPLOSIVES OR THERMIC COMPOSITIONS
45Compositions or products which are defined by structure or arrangement of component of product
12having contiguous layers or zones
14a layer or zone containing an inorganic explosive or an inorganic explosive or an inorganic thermic component
Applicants
  • SENCORP [US]/[US]
Inventors
  • REMEROWSKI, David, L.
Agents
  • LITZINGER, Jerrold, J.
Priority Data
08/462,26205.06.1995US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROPELLANT CHARGE STRUCTURE FOR GENERATING GASES TO PROPEL AN OBJECT FROM A TOOL
(FR) STRUCTURE DE CHARGE PROPULSIVE PERMETTANT DE PRODUIRE DES GAZ PROPULSANT UN OBJET DEPUIS UN OUTIL
Abstract
(EN)
A tool for driving a nail or other fastener is actuated by a caseless propellant charge (62) formed of combustible material that is transported into a combustion chamber (44) on a strip (64). The propellant charge (62) is ignited by striking a sensitizer portion (90) of the charge at an oblique angle. The ignition member (66) intermixes the sensitizer material (90) with an oxidizer layer (88) of the surface of the propellant charge (62), resulting in combustion of the charge. When ignited, the propellant charge (62) is compressingly interposed between an orifice plate (74) and a movable portion (80) of the combustion chamber. The orifice plate (74) includes a pedestal (78) with an annular compression surface that separates the surface of the ignition area from the remaining surfaces of the charge (62); insuring that ignition gases are forced through the charge (62). An annular C-shaped ring (82) is interposed between the orifice plate (74) and the movable portion (80) of the combustion chamber (44). When the charge (62) is ignited, the resulting gas pressure resiliently expands the annular C-shaped ring (82) and urges opposite axial ends of the C-shaped ring (82) into sealing relationship between the relatively movable components of the combustion chamber. Combustion gases are communicated through orifices (76) in the orifice plate (74) to a cylinder (40) where the gases force movement of a driver (42), which driver strikes and drives a fastener such as a nail. The driver (42) is reciprocally movable within the cylinder (40) and is returned to its precombustion position by a gas spring return cylinder (17). The gas return cylinder (17) is mechanically interconnected to the driver (42) and contains a sealed gaseous fluid that is independent of and segregated from fluids in the combustion chamber (44). An assembly (60) for deaccelerating the driver includes a series of spaced and aligned progressively sized metal cup members (110, 112, 114) of progressively increasing mass, contact surface area and interface angles.
(FR)
Outil de pose de clou ou d'une autre fixation, activé par une charge propulsive (62) sans douille formée d'un matériau combustible acheminé dans une chambre de combustion (44) sur une bande (64). Pour enflammer la charge propulsive (62), on frappe une partie activatrice (90) de la charge suivant un angle oblique. L'élément de mise à feu (66) mélange le matériau activateur (90) avec une couche d'oxydant (88) de la surface de la charge propulsive (62), ce qui aboutit à la combustion de la charge. Au moment de la mise à feu, la charge propulsive (62) s'intercale sous forme comprimée entre une plaque (74) percée d'orifices et une partie mobile (80) de la chambre de combustion. La plaque (74) percée d'orifices comporte un socle (78) avec une surface de compression annulaire qui sépare la surface de la zone de mise à feu des autres surfaces de la charge (62), ce qui garantit que les gaz de mise à feu sont contraints de passer à travers la charge (62). Une bague en C (82) est intercalée entre la plaque à orifices (74) et la partie mobile (80) de la chambre de combustion (44). Lorsque la charge (62) est mise à feu, la pression de gaz résultante provoque une expansion élastique de la bague en C (82) et presse les extrémités axiales opposées de la bague en C (82) de façon hermétique, contre les éléments relativement mobiles de la chambre de combustion. Les gaz de combustion passent par les orifices (76) de la plaque à orifices (74) dans un cylindre (40) où les gaz entraînent le mouvement de l'outil de pose (42), qui frappe et enfonce une fixation telle qu'un clou. L'outil de pose (42) peut se déplacer suivant un mouvement alternatif à l'intérieur du cylindre (40), et retourne à sa position pré-combustion sous l'action d'un cylindre de rappel à gaz (17). Ce cylindre de rappel (17) est interconnecté mécaniquement à l'outil (42) et contient un fluide gazeux confiné indépendant et séparé des fluides présents dans la chambre de combustion (44). Un ensemble (60) permettant de décélérer l'outil de pose comprend une série de coupelles métalliques (110, 112, 114) espacées et alignées par ordre de taille, dont la masse, la surface de contact et les angles d'interfaces augmentent progressivement.
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