US3497125A - Power-actuated tool - Google Patents

Power-actuated tool Download PDF

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Publication number
US3497125A
US3497125A US652601A US3497125DA US3497125A US 3497125 A US3497125 A US 3497125A US 652601 A US652601 A US 652601A US 3497125D A US3497125D A US 3497125DA US 3497125 A US3497125 A US 3497125A
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US
United States
Prior art keywords
barrel
piston
tool
pawl
housing
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 - Lifetime
Application number
US652601A
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English (en)
Inventor
John J O'brien
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.)
Illinois Tool Works Inc
Original Assignee
Olin Corp
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.)
Filing date
Publication date
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Publication of US3497125A publication Critical patent/US3497125A/en
Assigned to ILLINOIS TOOL WORKS INC, A CORP. OF DE. reassignment ILLINOIS TOOL WORKS INC, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OLIN CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • This invention relates generally to tools for driving fasteners or the like into masonry, concrete, wood, steel or the like. More particularly, this invention relates to a power-actuated tool utilizing a piston to drive the fastener element.
  • tools of the above type may include a barrel assembly mounted in a tubular portion of a housing for movement between a breech open position for loading and a breech closed position for firing.
  • a piston member is slidably mounted in the barrel assembly and includes a head portion and a reduced, elongated shank portion which drives the fastener.
  • tools of this type are provided with a piston return member which takes the form of a projection mounted on the housing and extending into the interior of the barrel so that when the barrel is moved into its breech open position, the projection can engage the forward face of the head portion of the piston to effect the return of the piston to its firing position.
  • This projection may also provide a means for guiding the barrel assembly during its movement.
  • the projection is normally positioned at a point forward enough in the housing so that when the piston is actuated and completes the driving function, the head portion thereof is spaced rearwardly from the projection.
  • a problem is encountered in the event that the tool is fired against a surface which is too soft to limit the penetration of the fastener. In this case, the piston member will "be overdriven, contacting the piston return projection and resulting in a shearing of the projection, damage to the piston, or both. This damage can also occur when the tool is fired without being positioned against a surface wherein there is nothing to absorb the forward motion of the piston except for the buffer means provided internally of the tool.
  • Yet another object of this invention is to provide a power-actuated tool wherein the piston return member also holds the barrel in a semiclosed position.
  • FIGURE 1 is a transverse sectional view of a poweraetuated tool constructed in accordance with the present invention and showing the components of the tool in a 3,497,125 Patented Feb. 24, 1970 position wherein movement of the housing member in a forward direction relative to the barrel assembly will cock the firing mechanism;
  • FIGURE 2 is a cross sectional view taken along the lines 22 of FIGURE 1;
  • FIGURE 3 is a transverse sectional view of the tool of FIGURE 1 showing the position of the piston return member and piston in the case where the piston is severely overdriven;
  • FIGURE 4 is a transverse sectional view of the tool of FIGURE 1 showing the various components of the tool in the position during movement of the barrel from the firing to the breech open position;
  • FIGURE 5 is a transverse sectional view of the tool of FIGURE 1 showing the components of the tool in the position wherein the piston return member serves to hold the barrel in a semi-open position.
  • FIGURE 1 shows a tool constructed in accordance with the present invention having a housing 2 including a tubular forward portion 4 and a rearward portion 6.
  • the tubular forward portion 4 includes an elongated opening 8 to provide access for loading and unloading an explosive cartridge.
  • the rearward portion 6 of the housing 2 houses the firing mechanism 10 and also includes a pistol grip 12 and a trigger guard 14.
  • a firing pin 20 is mounted behind the breech block 16 for axial movement in the housing 2 and includes a frusto-conical nose portion 22, a body portion 24 and a rearwardly extending rod portion 26.
  • the firing pin 20 is urged forwardly by a suitable spring member 28.
  • a detent member 30 extends radially downwardly from the body portion 24 of the firing pin 20.
  • the detent member 30 is spring biased outwardly by suitable spring means 32.
  • a cocking rod 34 is mounted for reciprocation in the rearward portion 6 of the housing 2 and includes a forward portion 36 extending through the breech block 16 and into the tubular forward portion 4 of the housing 2.
  • the cocking rod 34 may be spring biased forwardly by a suitable spring member 38.
  • the cooking rod may also include an elongated opening 40 through which the detent member 30 on the firing pin 20 may extend.
  • a trigger member 42 having a sear portion 44 may be pivotally mounted above the trigger guard 14 by a pivot pin 46.
  • the trigger is resiliently urged away from the firing position by spring member 48.
  • a barrel assembly 50 is reciprocally mounted within the tubuar portion 4 of the housing 2 and extends from the muzzle end thereof.
  • the barrel assembly includes a barrel member 52 having a bore 54 therein, the barrel member 52 includes a cartridge receiving chamber 56 at its breech end for the reception of an explosive cartridge 58.
  • the bottom outside surface of the barrel member includes an axially extending bottom portion 60 which is planar in a horizontal direction.
  • An elongated slot 62 extends through said bottom portion 60.
  • the barrel assembly 50 also includes a muzzle bushing 64 which has a bore 66 of lesser diameter than the bore in the barrel member 52 and is threadedly received within the forward end of the barrel member 52.
  • a sleeve member 68 surrounds the muzzle end of the barrel member 52 and includes an inturned fiange 70 which is positioned between the forward edge 72 of the barrel member 52 and a shoulder 74 on the external surface of the sleeve 68.
  • a piston member 76 may be mounted for reciprocal movement within the barrel assembly 50.
  • the piston member 76 includes a generally cylindrical head portion 78 and a reduced elongated cylindrical shank portion 80.
  • a piston ring 82 may be mounted within a suitable 3 groove 84 about the circumference of the head portion 78 of the piston member 76.
  • the muzzle bushing 64 is provided with a counterbore 86 in its rearward surface.
  • a suitable buffer member 88 is mounted in the counterbore 86 to absorb the energy of the piston member 76 in the event that the piston member 76 is overdriven.
  • the buffer member 88 comprises a hollow, cylindrical member fabricated from suitable material such as polyurethane, nylon or other suitable elastomeric materials.
  • the interior diameter of the buffer member 88 must be at least as great as the diameter of the bore 66 in the muzzle bushing 64, which in turn is of such a size as to slidably receive the shank portion 80 of the piston member 76.
  • the buffer member 88 extends rearwardly in the tool out of the counterbore 86 into the bore 54 of the barrel member 52 for a short distance.
  • a piston return member 90 is attached to the housing 2 adjacent the muzzle end of the forward portion 4.
  • the piston return member 90 comprises a screw member 92 having an internal bore 94.
  • a piston return pawl member 96 is mounted within the bore 94 in the screw member 92 for axial movement in the direction of the axis of the screw member 92.
  • a bore 98 in the bottom surface of the pawl member 96 provides an opening for reception of a spring member 100 which seats against the bottom of the bore 98 in the pawl member 96 and the bottom of the bore 94 in the screw member 92 to urge the pawl member 96 upwardly in the direction toward the interior of the barrel member 52.
  • the pawl member 96 includes a generally cylindrical outer surface 102 which is provided with oppositely disposed shoulders 104 by means of machining the uppermost portion of opposite sides of a pawl member 96 into a planar configuration or by reducing the diameter of the cylinder.
  • the spring member 100 urges the pawl member 96 upwardly in the tool so that the shoulders 104 abut against the bottom portion 60 of the barrel member 52 and the uppermost portion extends into the slot 62.
  • the bottom portion 60 of the barrel member 52 on opposite sides of the elongated slot 62 includes a straight portion 106 spaced from the axis of the bore 54 of the barrel member 52 such that when the shoulders 104 of the pawl member 96 abut thereagainst, the u ermost portion of the pawl member 96 extends into the interior of the barrel.
  • the forwardmost portion of the bottom portion 60 of the barrel member 52 adjacent the forward end of the slot 62 tapers outwardly to form a cam surface 108.
  • the portion between the cam surface 108 and 106 includes a straight portion 110 which is offset inwardly with respect to the straight portion 106 so that a shoulder or detent surface 112 is formed in the bottom portion 60.
  • the tool may be positioned against a suitable work surface.
  • the operator To fire the tool, the operator must push down on the housing 2 to move the housing 2 forward relative to the barrel assembly 50.
  • the cocking rod 34 abuts the rearward end of the barrel member 52 so that the housing 2 moves forward relative thereto.
  • the housing 2 By virtue of the detent member 30 extending into the opening 40 of the cocking rod 34, the housing 2 also moves forwardly with respect to the firing pin until the forward face of the breech block 16 abuts the rear surface of the barrel assembly 50.
  • the detent member of the firing pin 20 is in operable alignment with the sear portion 44 of the trigger member, so that by pulling the trigger member 42, the sear portion 44 will release the detent member 30 from the opening in the cocking rod and the firing pin 20 will move forward under the action of its spring member 28 until the nose portion 22 thereof ejects through the frusto-conical opening 18 in the breech block 16 and actuates the cartridge 58.
  • the gases generated by the explosion of the cartridge 58 will drive the piston member 76 forwardly and drive the fastener 114 into the work surface.
  • the barrel assembly 50 may be moved rearwardly into the position shown in FIGURE 5 and the tool positioned in a vertical direction without the barrel assembly 50 moving forward under the influence of gravity. This permits the operator to immediately begin to push down on the housing 2 to cock the tool and fire without the necessity of manually holding the barrel assembly 50 in the semi-closed position.
  • barrel means In a power-actuated tool, barrel means, housing means telescopically carrying said barrel means for relative movement in opposite directions, firing means in said housing, means responsive to movement of said barrel means in one direction for cocking said firing means, fastener driving means positioned in said barrel means for movement between a driving position and a driven position, return means responsive to the movement of said barrel in the opposite direction for returning said driving means from its driven position to its driving position,
  • a housing having front and rear portions, barrel means telescopically mounted in said front portion for axial movement be tween a breech open and a breech closed position, piston means mounted in said barrel means for movement between a driving position and a driven position, firing means mounted in said rear portion, means responsive to movement of said barrel means into said breech closed position for cocking said firing means, return means responsive to the movement of said barrel means into the breech open position for returning said piston means to said driving position, and means responsive to movement of said barrel means into said breech closed position for moving said return means into a position where said return means will be out of the path of said piston means when said barrel is in said breech closed position.
  • said means for moving said return means out of the path of said piston means comprises a cam surface on said barrel means adapted to contact said pawl means to move said pawl means out of a position to be engaged by said means on said piston when said barrel is moved into its breech closed position.
  • said pawl means comprises a pawl housing attached to said housing adjacent the forward end of said front portion, a pawl member mounted in said pawl housing, spring means within said pawl housing for biasing said pawl member toward the interior of said barrel, said pawl member having shoulder means to abut the exterior surface of said barrel means adjacent said slot to limit movement of said pawl means toward the interior of said barrel means.
  • said barrel means includes a barrel member and a muzzle bushing attached to the forward end of said barrel member, and further including a buffer member mounted in said muzzle bushing and extending rearwardly into said barrel member to a point axially forward of said slot.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US652601A 1967-07-11 1967-07-11 Power-actuated tool Expired - Lifetime US3497125A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US65260167A 1967-07-11 1967-07-11

Publications (1)

Publication Number Publication Date
US3497125A true US3497125A (en) 1970-02-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US652601A Expired - Lifetime US3497125A (en) 1967-07-11 1967-07-11 Power-actuated tool

Country Status (5)

Country Link
US (1) US3497125A (enrdf_load_stackoverflow)
JP (1) JPS507316B1 (enrdf_load_stackoverflow)
DE (1) DE1703793C3 (enrdf_load_stackoverflow)
FR (1) FR1574377A (enrdf_load_stackoverflow)
GB (1) GB1191218A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189081A (en) * 1978-09-18 1980-02-19 Societe De Prospection Et D'inventions Techniques Spit Return pawl for powder-actuated tool
US4830252A (en) * 1986-07-23 1989-05-16 Continental/Midland, Inc. Hammer-activated, powder-actuated drive tool
US6059162A (en) * 1998-10-16 2000-05-09 Illinois Tool Works Inc. Exhaust baffle and spring assisted reset and dampener for powder actuated tool
US20110006097A1 (en) * 2008-01-30 2011-01-13 Itw Construction Systems Australia Pty Ltd Fastener driving tool
US20210370488A1 (en) * 2018-05-23 2021-12-02 Illinois Tool Works Inc. Powered fastener driving tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6234015U (enrdf_load_stackoverflow) * 1985-08-14 1987-02-28

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3066302A (en) * 1956-06-08 1962-12-04 Olin Mathieson Power tool
US3172119A (en) * 1961-09-08 1965-03-09 Olin Mathieson Explosive-powered fastening tools
US3341101A (en) * 1965-09-02 1967-09-12 Olin Mathieson Power-actuated tool
US3348751A (en) * 1965-08-02 1967-10-24 Olin Mathieson Power operated piston tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3066302A (en) * 1956-06-08 1962-12-04 Olin Mathieson Power tool
US3172119A (en) * 1961-09-08 1965-03-09 Olin Mathieson Explosive-powered fastening tools
US3348751A (en) * 1965-08-02 1967-10-24 Olin Mathieson Power operated piston tool
US3341101A (en) * 1965-09-02 1967-09-12 Olin Mathieson Power-actuated tool

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189081A (en) * 1978-09-18 1980-02-19 Societe De Prospection Et D'inventions Techniques Spit Return pawl for powder-actuated tool
US4830252A (en) * 1986-07-23 1989-05-16 Continental/Midland, Inc. Hammer-activated, powder-actuated drive tool
US6059162A (en) * 1998-10-16 2000-05-09 Illinois Tool Works Inc. Exhaust baffle and spring assisted reset and dampener for powder actuated tool
US20110006097A1 (en) * 2008-01-30 2011-01-13 Itw Construction Systems Australia Pty Ltd Fastener driving tool
US8640939B2 (en) * 2008-01-30 2014-02-04 Itw Construction Systems Australia Pty Ltd Fastener driving tool
US20210370488A1 (en) * 2018-05-23 2021-12-02 Illinois Tool Works Inc. Powered fastener driving tool
US12186869B2 (en) * 2018-05-23 2025-01-07 Illinois Tool Works Inc. Powered fastener driving tool

Also Published As

Publication number Publication date
DE1703793A1 (de) 1972-03-09
JPS507316B1 (enrdf_load_stackoverflow) 1975-03-24
DE1703793B2 (de) 1974-01-31
GB1191218A (en) 1970-05-13
DE1703793C3 (de) 1974-08-29
FR1574377A (enrdf_load_stackoverflow) 1969-07-11

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AS Assignment

Owner name: ILLINOIS TOOL WORKS INC, A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OLIN CORPORATION;REEL/FRAME:004511/0377

Effective date: 19860131