US3604311A - Compressed air nailing machine - Google Patents

Compressed air nailing machine Download PDF

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Publication number
US3604311A
US3604311A US841360A US3604311DA US3604311A US 3604311 A US3604311 A US 3604311A US 841360 A US841360 A US 841360A US 3604311D A US3604311D A US 3604311DA US 3604311 A US3604311 A US 3604311A
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United States
Prior art keywords
cylinder
compressed air
flange
nailing machine
piston
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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
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US841360A
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English (en)
Inventor
Umberto Monacelli
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Individual
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Individual
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Publication date
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Publication of US3604311A publication Critical patent/US3604311A/en
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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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
    • B25C1/042—Main valve and main cylinder

Definitions

  • COMPRESSED AIR NAILING MACHINE This invention relates to a pneumatic nailing machine of the type in which the individual metallic nails are violently expelled and driven by percussion blows caused by a hammer moved by a piston sliding in a cylinder.
  • the object of this invention is to eliminate said disadvantages by providing an arrangement in which during the whole of the descending phase of the piston, the cylinder chamber lying beneath the piston remains connected to atmosphere, and in which the return stroke takes place by the action of compressed air furnished directly from the principal reservoir.
  • the essential characteristic of the nailing machine is thus attained, i.e. a free and rapid descent of the piston during the working phase and a rapid piston rise without excessive waste of air during the rise itself.
  • the pneumatic nailing machine of the above-said type comprising a flanged ring nut which slides in a airtight manner on the terminal part of the cylinder in order to alternately close or open communication between the lower cylinder opening and either the atmosphere or the compressed air reservoir, said flange constituting a differential piston with the cooperation of its faces which slides in an airtight manner in the interspace between the cylinder and the tool body, the interspace being subdivided by the flange into two chambers, an upper chamber in communication with the internal upper terminal part of the cylinder by way of a duct, and a lower chamber in communication with the compressed air reservoir, the area of the flange subjected to the pressure in the upper chamber being greater than the area of the flange subjected to the pressure in the lower chamber.
  • the ring nut functioning as a valve, automatically controlled by the differential efiect of the compressed air, permits the descending and accelerating phase of the piston to be carried out with maximum efficiency, giving the air thrust by the piston a free path to atmosphere, and allows the piston rise to take place under the direct action of compressed air from the reservoir on the lower face of the piston.
  • FIG. I is a perspective view of the nailing machine
  • FIG. 2 is an axial section through the principal body, one half ofwhich (to the left) showing the position of the members in the rest phase, and the other half (to the right) showing the position of the members in the nail expulsion phase.
  • the nailing machine shown is of the portable type comprising a principal hollow body 1 with a hollow handle 2 provided with a connection 3 for the compressed air feed pipe.
  • a cylinder 4 with an internal jacket 5, in which a piston 6 slides which is rigid with a rod 7 functioning as a percussion hammer for the expulsion of one nail or pin at a time by way of the guide hole formed in the rest plate 8, said nails or pins coming from the storage holder 9.
  • the upper opening of the cylinder 4 is closed or opened by the annular cap 10 rigidly moved by the differential valve 11 controlled in the known way by a trigger 12.
  • reference numeral 13 indicates the cover of the top of the body 1
  • reference numeral 14 indicates the impact pad for the piston at the end of its working stroke, said pad 14 being shaped so as to leave the slits 15 which connect the lower chamber of the cylinder 4 to atmosphere, free.
  • a ring nut 16 with a flange l6 slides in an airtight manner on the lateral terminal surface of the cylinder 4. Said ring nut when in its upper position leaves the slits 15 open, while in its lower position, with its edge hitting on the pad ,14, it closes the air passage through the slits.
  • the flange of said ring nut divides the interspace between the cylinder 4 and body 1 into two chambers 17, 18, of which the chamber 17 is connected to the duct 20 which emerges inside the cylinder 4 by way of a small gauged hole 19 situated in the upper part of the jacket 5, while the chamber 18 is connected to the upper chamber 22, which functions as a compressed air reservoir, by way of the duct 21.
  • the duct 21 extends downwards until it communicates with the hole 21, by way of the passage hole 23 formed in the wall of the mobile ring nut 16, and connects the reservoir 22 to the inside of the cylinder 4 when the flange is in the lower limiting position (see FIG. 2, right).
  • the reference numeral 24 indicates the seal ring which separates the reservoir 22 from the interspace 17, 18.
  • the nailing machine illustrated operates in the following manner:
  • the ring nut 16 is thrust downwards because of the differential pressure until it presses against the pad 14, so closing the passage between the slits and the lower chamber of the cylinder 4, and opening instead the passage for the compressed air which penetrates into the lower chamber of the cylinder 4 by way of the duct 21 and the holes 21 and 23, thus acting on the lower face of the piston 6 which now can carry out its return stroke after closure of the feed into the cylinder 4 by means of the cap 10 which simultaneously opens the discharge through the duct 25. Meanwhile the pressure in the chamber 17 is discharged by way of the duct 20 and the gauged hole 19, because of which the higher pressure in the chamber 18 causes the ring nut to rise, in this way arranging the nailing machine for the next cycle.
  • the hole 19 must be sized so as to ensure a slight lag in the operation of the ring nut during the rise and fall of pressure in the chamber 17, this lag being necessary in order that the ring nut carries out its strokes just after the strokes of the piston and not before, in order to ensure regularity of the phases of the working cycle.
  • a compressed air nailing machine of the type comprising a body connected to a supply of compressed air, and which contains a cylinder in which a hammer-carrying piston slides for the expulsion and percussion of individual metallic pins or nails, comprising a flanged ring nut which slides in an airtight manner on said cylinder in order to alternately close or open communication between an opening in the lower cylinder and either atmosphere or the compressed air supply, the flange of said nut engaging and sliding on the inside wall of said body and constituting a differential piston which slides in an airtight manner in the interspace between the cylinder and said body, the interspace being subdivided by the flange into two chambers, an upper chamber in communication with the internal duct which connects the upper chamber of said interspace to the internal upper part of the cylinder has a gauged and calibrated port in order to slow down the flow of air in order to cause operation of the ring nut with the lag required by the cycle.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US841360A 1968-07-19 1969-07-14 Compressed air nailing machine Expired - Lifetime US3604311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1918168 1968-07-19

Publications (1)

Publication Number Publication Date
US3604311A true US3604311A (en) 1971-09-14

Family

ID=11155575

Family Applications (1)

Application Number Title Priority Date Filing Date
US841360A Expired - Lifetime US3604311A (en) 1968-07-19 1969-07-14 Compressed air nailing machine

Country Status (2)

Country Link
US (1) US3604311A (enrdf_load_stackoverflow)
FR (1) FR2013262A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223740A3 (en) * 1985-11-19 1988-06-08 Hilti Aktiengesellschaft Powder-actuated nail-setting tool

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE789035A (fr) * 1971-12-22 1973-01-15 Senco Products Outil pneumatique pour chasser des attaches
GB1510752A (en) * 1975-02-05 1978-05-17 Haytayan H Pneumatic fastener driving or impacting apparatus
DE2651529A1 (de) * 1976-11-11 1978-05-18 Hilti Ag Druckluftbetriebenes setzgeraet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348280A (en) * 1920-02-11 1920-08-03 Howell George William Rock-drill or impact engine
US3479926A (en) * 1965-12-29 1969-11-25 Gaston E Marbaix Ltd Pneumatic devices for driving fasteners or like purposes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348280A (en) * 1920-02-11 1920-08-03 Howell George William Rock-drill or impact engine
US3479926A (en) * 1965-12-29 1969-11-25 Gaston E Marbaix Ltd Pneumatic devices for driving fasteners or like purposes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223740A3 (en) * 1985-11-19 1988-06-08 Hilti Aktiengesellschaft Powder-actuated nail-setting tool

Also Published As

Publication number Publication date
FR2013262A1 (enrdf_load_stackoverflow) 1970-03-27

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