CA1037651A - Pistol apparatus for driving tacks, nails and the like into material - Google Patents
Pistol apparatus for driving tacks, nails and the like into materialInfo
- Publication number
- CA1037651A CA1037651A CA231,490A CA231490A CA1037651A CA 1037651 A CA1037651 A CA 1037651A CA 231490 A CA231490 A CA 231490A CA 1037651 A CA1037651 A CA 1037651A
- Authority
- CA
- Canada
- Prior art keywords
- tack
- barrel
- casing
- tacks
- plunger means
- 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
- B25C5/00—Manually operated portable stapling tools; Hand-held power-operated stapling tools; Staple feeding devices therefor
- B25C5/16—Staple-feeding devices, e.g. with feeding means, supports for staples or accessories concerning feeding devices
- B25C5/1679—Staple-feeding devices, e.g. with feeding means, supports for staples or accessories concerning feeding devices comprising storing arrangements for a plurality of staple strips
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Dovetailed Work, And Nailing Machines And Stapling Machines For Wood (AREA)
- Coating Apparatus (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
Pistol apparatus for driving in tacks, compris-ing in combination a magazine adapted to receive at least one set of tacks arranged with their stems parallel and attached to one another indirectly by means of a strip of detachably interconnected cylindrical casings each holding a tack. The pistol comprises a barrel having a bore which has the same internal diameter as the external diameter of the casings, plunger means reciprocable in the barrel, means to apply compressed air to the plunger means to reciprocate the plunger means relative to the barrel to detach a casing and its tack from the set and to cause both to advance through the bore and to detach the tack from the casing and to drive in the stem of the tack into material to be tacked. Means provided on the plunger means retract the empty casing to a po-sition in line with the strip and means are provided to feed the strip into the path of the plunger means whereby the advancing strip pushes the empty casing to a position out of alignment with the barrel. A protuberance provided on the plunger means contact and expel the empty casing of the tack previously driven upon advance of the plunger means to drive the next tack.
Pistol apparatus for driving in tacks, compris-ing in combination a magazine adapted to receive at least one set of tacks arranged with their stems parallel and attached to one another indirectly by means of a strip of detachably interconnected cylindrical casings each holding a tack. The pistol comprises a barrel having a bore which has the same internal diameter as the external diameter of the casings, plunger means reciprocable in the barrel, means to apply compressed air to the plunger means to reciprocate the plunger means relative to the barrel to detach a casing and its tack from the set and to cause both to advance through the bore and to detach the tack from the casing and to drive in the stem of the tack into material to be tacked. Means provided on the plunger means retract the empty casing to a po-sition in line with the strip and means are provided to feed the strip into the path of the plunger means whereby the advancing strip pushes the empty casing to a position out of alignment with the barrel. A protuberance provided on the plunger means contact and expel the empty casing of the tack previously driven upon advance of the plunger means to drive the next tack.
Description
1~376~
The present invention relates to a pistol a~paratus for driving in tacks, small nails or the like (hereinaf-ter referred to collectively as "tacks") ~articularly for decorating and/or la-minatiny materials. The tacks may be used for furniture suit-cases, or for ~ixing carpets and so on.
Numerous forms of pistol apparatus for driving tack~q i~-to materials are known~ but these generally have the drawbacks of not being able to protect the head o~ the tack sufficiently to avoid de~ormation and of not being adapted to recei~e small tac~
of very diver~e dimenslons and ~hapes and of not permitting the use of an elongated barrel; use of ~n elongated barrel is desirable a~ it enables the placement of the tacks at points whlch are of diffioult acces~
By way of example ln explanation o~ the known apparatus, reference is made to a number of prior specifications. Thus, German Specification laid open to inspection under ~o. 2245860 re-lates to a pistol apparatus in which the small tacks are inserted in a ribbon. In the act of cut-ting from the ribbon, two lateral wings of plastic pro~ect from the tack, and these wings prevent the correct operation and adver~ely affect the ae~thetic appeara~ce of the inserted small nails~
In German Specification laid open to public in~peotion under No 2163556 the small tacks are provided with casing~ and are ~tuck onto a ribbon. In this ca~e, the small tacks which are of a single, small tolerance measurement tend to become mutually displaced and not fixed perpendicularly to the fi~ing surface.
In German Speciflcatlon laid open to public inapection under No. 2211511 the small tacks are held by three ribbons and not by casings allowing the receiving of variQus sizes of small 3o tacks having the ~ame outer measurement. In -this case, during the adva~cing each ~mall tack does not remain supported and guided by the ribbon with seriou~ resulting drawback of the possibility o~
~r~
~)37~
the tack jamming in the pistol apparatus.
In German Specification laid open to inspection under No. 1478804 the carrier is hinged to one end of the grip of a pistol.
A number of other known arrangements, less relevant than those discu~sed above and disclosed in the following published documents:
German Specification laid open to public inspection under No.
2348956;
German Specification laid open to public inspection under No.
1478897, German Specificationlaid open to inspection uner No. 1957930;
German Gebrauchsmuster No. 7213327 and the German Gebrauchsmuster No. 1929998.
According to the present invention there is provided a pistol apparatus for driving in -tacks,comprising a magazine adapted to receive at least one set of tacks arranged with their stems parallel and attached to one another indirectly by means of a strip of detachably interconnected cyl1ndrical casings each holding a tack. The pistol comprises a barrel having a bore which has the same internal diameter as the external diameter of the casings, plunger means reciprocable in the barrel, means to apply compressed air to the plungermeans to reciprocate the plunger means relative to the barrel to detach a casing and its tack from the set and to cause both to advance through the bore and to detach the tack from the casing and to drive in the stem of the tack into material to be tacked. Means provided on the plunger means retract the empty casing to a position in line with the strip, and means are provided to feed the strip into the path of the plunger means whereby the advancing strip pushes the empty casing to a position out of alignment with the barrel. A protuberance provided 1~376Sl on the plun~er means contact and expel the empty casing of the tack previously driven upon advance of the plunger means to drive the next tack.
Preferably, the magazine contains at least two sets of tacks attached to one another by their casings in plural rows disposed side by side, the magazine being hingedly mounted so as to be pivotable between positions of use in which respective rows of tack can be driven in.
Unlike the known pistol apparatus~in the pistol apparatusaccording to the invention, small tacks with heads of different dimensions and shape can be held inside casings having constant outer diameter or dimensions corresponding to the internal diameter or dimensions of the barrel of the pistol apparatus. The guiding of the small tacks is thus perfect even if the pistol apparatus has a lony barrel; futhermore the s~ems of the small tacks are always disposed axially with respect of the barrel.
An embodiment of the present invention will now be described, by way of example, with reference to the accom-panying drawing, wherein:
Figure 1 shows an elevation, partly in section, of pistol apparatus according to the embodiment of the invention;
E'igure 2 shows the apparatus of Figure 1 in front view;
Figure 3 shows a cross sectional elevation to a larger scale of a casing containing a small tack, Figure 4 is a view in plan showing a set of casings joined together;
Figure 5 is a sectional view in plan of the muzzle end of the apparatus of Figure l;
Figure 6 is a front view of one form of the muzzle end of the apparatus of Figure l;
.s~3 .~ , 1e~37~
Figure 7 is the front view of another form of the muzzle end of the apparatus for use in the apparatus of Figure 1 in place of the detail of Figure 6; and Figure 8 shows in front view, a modified form of casing for an individual tack~
The pistol apparatus shown in Figure 1 is pneumatically operated and consists of a body 1 provided with a hand grip 2~
Inside the said body 1 is a cylindrical bore 1' in which is mounted an intermediate hollow cylindrical body 3 having a cylindrical cavity 3'. This body 3 has in its front part a widened, conical portion 3". The outer periphery of the body 3 is surrounded by chambers 6 and 6' which are independent and watertight and communicate respectively with the said cylin-drical cavity 3' by means of the bores 7, 7', and 8~ Within this cylindrical cavity 3' slides a main piston ~, the rod 5 of which is provided with a reduced diameter portion 5" and an enlarged portion 5'. Against the rod side of the piston 4, is disposed a washer or coating 9 of elastic material which serves the function of shock absorber and partial return spring for piston 4 and rod 5.
The rod 5 is slidably mounted axially in a hollow cylindrical sleeve 32 which has in its rear part an enlarged portion 32' pro-vided with a bore 32" lying radially with respect to the axis of the said sleeve. Portion 32'has an internal diameter less than the external diameter of portion 5. Inside the bore 32", which opens into the bore of the sleeve 32 and which in the position shown is in alignment with the reduced diameter portion 5" of rod 5, are two balls 30 and 30' placed one above the other. These are supported by being trapped between the reduced diameter portion 5" of the rod 5 and the inner wall of the cylindrical body 3. On the front part of the hollow cylindrical body 32 is mounted a member 34 1~37~
coaxial with.sleeve 32 and provided with. two lateral wings 35 and 35' (Figure 5), that extend inwards at their front ends and a protuberance 36 in the upper part (Figures 1 and 5). The wings 35 and 35' and the protuberance 36 are adapted to slide in the radial grooves 39, 39' and 39" respe~ively of the barrel 38 ~figures 1 and 2). The rod 5 and the hollow cylindrical sleeve 32 are capable of moving axially through the front end 37 of the body 1. On the hollow sleeve 32 is mounted sliclably and axially a body 31 of elastic material, which serves the function o~ a shock absor-ber and return spring for portion 32' and sleeve 32.
Against the free end of the barrel 38 is fixed an interchangeable fitting 16 (Figures 1 and 6) having a bore concentric with the axis of the said barrel and an inner diameter adapted to that of the head of the respective small tack to be driven by the apparatus. This part also has radial grooves 16' (Figures 1 and 6) to ensure perfect alignment be-tween the heads 22 of the individual small tacks by supporting the end of the groove 16' on head 22' of the small tack, previously inserted, as shown in Figure 6.
Where the spacing between the tacks driven in is to be greater, the arrangement shown in Figure 7 may be used.
The fitting 43 is used instead of fitting 16, and it will be seen that this fitting 43 has a radial tongue 43' having a concave end 43" matched to the shape of the tack head.
Under the barrel 38 of this pistol apparatus there is mounted a carrier or magazine 24 which is perpendicular to the lo.ngitudinal axis of the barrel. The magazine is carried on the plate 44 and has a slidable body 46 (Figure 2) which is urged by a spring tnot shown) to cause the associated set of small tacks to be advanced towards the body 32. The tacks are shown connected to one another with the stems parallel and equidistant, and with each head held in its own casing 21. The casings 21 (Figure 4) have circular cross sections and are attachecl to one ~0376S~
another tanqentially. In addition, the carrier 24 contains two or more sets of small tacks contained respectively in casings 21 attached to one another. After the exhaustion of one set of tacks, the second set of tacks can be presented for use by la-teral dis-placement of the carrier 24 about an axis of rotation defined by connecting stud 49 (Figure 1) and the tacks of the second set can be used immediately. As seen in Fig. 2, this movement to switch from the first set of tacks to the second, is shown as a swinging movement of the upper end of carrier 24 in the direction of the arrow 24'.
The said casings 21 are made of elastic or flexible material, in particular thermo~plastics ma~eria:L. The head 22' of each of the small tacks is of more or less spherical shape and is held by the pressure of a continuous inner and elastic annular edge 21' " (Figure 3) which pushes it against the front continuous annular edge 21"", the latter having an inner diameterslightly less than the outer diameter of the head 22' of the said small tack. It is obvious that whatever the shape of these casings they will have a bore 21" to permit the passage therethrough of the rod 5 of the piston 4.
In Figure 8 there is shown a casing 21 having notched edging 21". The barrel 38 of the pistol apparatus will have an inner bore of diameter substantially equal to that of the individual casings. It is also possible, although less practical, to make the bore of the barrel 38 of square or rectangular section and to give the casings 21 the same outer shape, to ensure a more secure connection in a set between casings. One of the main ad-vantages of the pistol apparatus described is that it permits of driving in small tacks in places of difficult access such as in complete articles of furniture, since it is possible to make the barrel very long and the small tack is guided by the casing as far , .
1 03765~
as the end of the barre~. This is not possible with the pistol apparatus of most known typel in which the small tacks are not provided with casings.
Other important advantages of the pistol appa-- ratus described consist in that in the act of driving in o~ the stem of the small tack, the stem in kept accurately perpendicular in relation to the fixing plane, and in that the head of the small tack is efficiently freed from the casing.
A further advantage of the apparatus is shown by the fact that the dimensions of the inner seating of the casings may be varied, keeping their outer diameter, and thereby it is possible to accomodate in respective cases small tacks and orna-mental tacks of considerably different configuration as regards shape, diameter, height and carvature of the head 22', and length and section of the stem 22" '. These can all be driven in using the same pistol apparatus which is not possible with the pistol apparatus of known type The pistol apparatus described operates as follows:
The pistol apparatus is connected to a source of compressed air through pipe 54. Pressing the trigger 25 causes the compressed air from pipe 54 to pass through the bore 26 of the grip 2 and the bore 8 of the cylindrical body 3, driving the pistol 4 forwards. Pushed by the compressed air, the piston 4 shoots forward, displacing in its course stem 5 and in consequence the balls 30 and 30' which are trapped in the reduced part 5" of the stem 5 and against the hollow sleeve 3 and so the sleeve 32 moves with the piston 4. Advancing of the cylindrical sleeve 32 moves sleeve 34 and the lateralwings of sleeve 34 (Figure 5) into registry with a casing 21 provided with a small tack (Figure 5). This casing 21 and its tack are thus foreibly torn off and ~037~
separated form the set arranged in the carrier or magazine 24. The casing and its tack are thus pushed, until sleeve 32 reaches the end of its stroke. The point 22 of the small tack will then pro-trude by about a couple of millimeters beyond the outer face of the interchangeable spoke 16. At this point, the balls 30 and 30', which, during the advancing described, slide contained between the inner wall of the cylindrical body 3 and the reduced portion 5" of the stem 5 preventing the said stem 5 from sliding freely relative to the hollow cyllnder 32, arrive at the location of the widened portion 3" of the cylindrical body 3" of the cylindrical body 3. On reaching this position, the balls 30, 30' are now free to move radially outwardly and do so due to the reaction resulting from the compressed air thrust on piston 4 thereby enabling the piston 4 and its stem 5 to move f.reely forward relative to the body 3 and sleeve 32. Thus the stem 5, which is always under the action of the piston 4, is pushed onto the head of the small tack through the cylindrical bore 21" (Figure 3) of the casing and drives the tack from the casing into the material, whilst the said casing remains held from further advancement by the inwardly ben~ ends-of wings 35 and 35' (Figure 5) of ~he member 34.
During its advance, piston 4 forces air out of cavity 3' through bores 7 and 7' and out into the peripheral chamber 6. Furthermore, the piston 4 moves, during its advance, beyond the bore 7' in the cylindrical body 3, permitting the com-pressed air to pass out into the peripheral chamber 6 where it is accumulated for the return movement of the piston. sy releasing the trigger 25, the air pressure driving the piston is instantaneous-ly vented to atmosphere through the bore 26 and the valve(not shown) In this forwardmost position of the parts, in which the tack has been fully driven, the bodies 9 and 31 of ~a376s:1 elastic material are compressed and the air in chamber 6 is also compressed. Body 9 forces the piston 4 back relative to the sleeve 32, thus closing bore 7' and shutting cavity 3' and chamber 6 off from communication with each other. When piston 4 is moved sufficiently to the rear relative to sleeve 32 to permit reduced portion 5" of rod 5 to register with the bore 32', the enlarged portion 5' of rod 5 will contact the enlarged portion 32' with its relatively small internal diameter, which will drag sleeve 32 to the rear. The balls 30 and 30' are now forced to move back into reduced portion 5" of rod 5 by the tapered orconvergent inner surface of enlarged portion 3", which acts like a cam to force them into reduced portion 5". Thus the balls 3~' are positively cammed back into reduced portion 5", after which piston 4 and sleeve 32 with portion 32' are locked toyether to move to the right to return to the Figure 1 position of the parts. The air to the rear of piston 4 is vented through bore 26 and the valve (not shown~ upon release of the trigger 25 so as not to impede this return movement, the return movement of piston 4 being not only under the spring action of the bodies 9 and 31, but more particularly under the influence of the air compressed in chamber 6, which flows back through bores 7 and 7' for this purpose.
Automatically, the casing 21, now empty, and located between the curved wings 35 and 35' of the member 34 is brought back into its initial position in alignment with the carrier or magazine 25. Under the action of the thrust of the slide 46, the empty casing held between the curved wings of the member 34 is struck radially by the next Eull casinCJ of the set located in the carrier 24, and is compelled to slide towards the top until it touches the projecting body 60, whilst the full casing which has so pushed it enters between the wings 35 and 35' of the cylindrical body. On re-operating the trigger 25, the _ g _ 1~37~5~
advance of the piston 4, of the stem 5, of the hollow cylindrical body 32 and of the cylindrical body 34 already described, will recur. Whilst the lower part of the member 34 separates the casing containing a small nail held between the two wings of the set lo-cated in the carrier 24, the protuberance 36 (Figures 1 and 5) of the member 34 will expect the empty casiny thrusting it and pushing it forward through the opposite opening 61 (Figures 1 and 2) made in the barrel 38.
The present invention relates to a pistol a~paratus for driving in tacks, small nails or the like (hereinaf-ter referred to collectively as "tacks") ~articularly for decorating and/or la-minatiny materials. The tacks may be used for furniture suit-cases, or for ~ixing carpets and so on.
Numerous forms of pistol apparatus for driving tack~q i~-to materials are known~ but these generally have the drawbacks of not being able to protect the head o~ the tack sufficiently to avoid de~ormation and of not being adapted to recei~e small tac~
of very diver~e dimenslons and ~hapes and of not permitting the use of an elongated barrel; use of ~n elongated barrel is desirable a~ it enables the placement of the tacks at points whlch are of diffioult acces~
By way of example ln explanation o~ the known apparatus, reference is made to a number of prior specifications. Thus, German Specification laid open to inspection under ~o. 2245860 re-lates to a pistol apparatus in which the small tacks are inserted in a ribbon. In the act of cut-ting from the ribbon, two lateral wings of plastic pro~ect from the tack, and these wings prevent the correct operation and adver~ely affect the ae~thetic appeara~ce of the inserted small nails~
In German Specification laid open to public in~peotion under No 2163556 the small tacks are provided with casing~ and are ~tuck onto a ribbon. In this ca~e, the small tacks which are of a single, small tolerance measurement tend to become mutually displaced and not fixed perpendicularly to the fi~ing surface.
In German Speciflcatlon laid open to public inapection under No. 2211511 the small tacks are held by three ribbons and not by casings allowing the receiving of variQus sizes of small 3o tacks having the ~ame outer measurement. In -this case, during the adva~cing each ~mall tack does not remain supported and guided by the ribbon with seriou~ resulting drawback of the possibility o~
~r~
~)37~
the tack jamming in the pistol apparatus.
In German Specification laid open to inspection under No. 1478804 the carrier is hinged to one end of the grip of a pistol.
A number of other known arrangements, less relevant than those discu~sed above and disclosed in the following published documents:
German Specification laid open to public inspection under No.
2348956;
German Specification laid open to public inspection under No.
1478897, German Specificationlaid open to inspection uner No. 1957930;
German Gebrauchsmuster No. 7213327 and the German Gebrauchsmuster No. 1929998.
According to the present invention there is provided a pistol apparatus for driving in -tacks,comprising a magazine adapted to receive at least one set of tacks arranged with their stems parallel and attached to one another indirectly by means of a strip of detachably interconnected cyl1ndrical casings each holding a tack. The pistol comprises a barrel having a bore which has the same internal diameter as the external diameter of the casings, plunger means reciprocable in the barrel, means to apply compressed air to the plungermeans to reciprocate the plunger means relative to the barrel to detach a casing and its tack from the set and to cause both to advance through the bore and to detach the tack from the casing and to drive in the stem of the tack into material to be tacked. Means provided on the plunger means retract the empty casing to a position in line with the strip, and means are provided to feed the strip into the path of the plunger means whereby the advancing strip pushes the empty casing to a position out of alignment with the barrel. A protuberance provided 1~376Sl on the plun~er means contact and expel the empty casing of the tack previously driven upon advance of the plunger means to drive the next tack.
Preferably, the magazine contains at least two sets of tacks attached to one another by their casings in plural rows disposed side by side, the magazine being hingedly mounted so as to be pivotable between positions of use in which respective rows of tack can be driven in.
Unlike the known pistol apparatus~in the pistol apparatusaccording to the invention, small tacks with heads of different dimensions and shape can be held inside casings having constant outer diameter or dimensions corresponding to the internal diameter or dimensions of the barrel of the pistol apparatus. The guiding of the small tacks is thus perfect even if the pistol apparatus has a lony barrel; futhermore the s~ems of the small tacks are always disposed axially with respect of the barrel.
An embodiment of the present invention will now be described, by way of example, with reference to the accom-panying drawing, wherein:
Figure 1 shows an elevation, partly in section, of pistol apparatus according to the embodiment of the invention;
E'igure 2 shows the apparatus of Figure 1 in front view;
Figure 3 shows a cross sectional elevation to a larger scale of a casing containing a small tack, Figure 4 is a view in plan showing a set of casings joined together;
Figure 5 is a sectional view in plan of the muzzle end of the apparatus of Figure l;
Figure 6 is a front view of one form of the muzzle end of the apparatus of Figure l;
.s~3 .~ , 1e~37~
Figure 7 is the front view of another form of the muzzle end of the apparatus for use in the apparatus of Figure 1 in place of the detail of Figure 6; and Figure 8 shows in front view, a modified form of casing for an individual tack~
The pistol apparatus shown in Figure 1 is pneumatically operated and consists of a body 1 provided with a hand grip 2~
Inside the said body 1 is a cylindrical bore 1' in which is mounted an intermediate hollow cylindrical body 3 having a cylindrical cavity 3'. This body 3 has in its front part a widened, conical portion 3". The outer periphery of the body 3 is surrounded by chambers 6 and 6' which are independent and watertight and communicate respectively with the said cylin-drical cavity 3' by means of the bores 7, 7', and 8~ Within this cylindrical cavity 3' slides a main piston ~, the rod 5 of which is provided with a reduced diameter portion 5" and an enlarged portion 5'. Against the rod side of the piston 4, is disposed a washer or coating 9 of elastic material which serves the function of shock absorber and partial return spring for piston 4 and rod 5.
The rod 5 is slidably mounted axially in a hollow cylindrical sleeve 32 which has in its rear part an enlarged portion 32' pro-vided with a bore 32" lying radially with respect to the axis of the said sleeve. Portion 32'has an internal diameter less than the external diameter of portion 5. Inside the bore 32", which opens into the bore of the sleeve 32 and which in the position shown is in alignment with the reduced diameter portion 5" of rod 5, are two balls 30 and 30' placed one above the other. These are supported by being trapped between the reduced diameter portion 5" of the rod 5 and the inner wall of the cylindrical body 3. On the front part of the hollow cylindrical body 32 is mounted a member 34 1~37~
coaxial with.sleeve 32 and provided with. two lateral wings 35 and 35' (Figure 5), that extend inwards at their front ends and a protuberance 36 in the upper part (Figures 1 and 5). The wings 35 and 35' and the protuberance 36 are adapted to slide in the radial grooves 39, 39' and 39" respe~ively of the barrel 38 ~figures 1 and 2). The rod 5 and the hollow cylindrical sleeve 32 are capable of moving axially through the front end 37 of the body 1. On the hollow sleeve 32 is mounted sliclably and axially a body 31 of elastic material, which serves the function o~ a shock absor-ber and return spring for portion 32' and sleeve 32.
Against the free end of the barrel 38 is fixed an interchangeable fitting 16 (Figures 1 and 6) having a bore concentric with the axis of the said barrel and an inner diameter adapted to that of the head of the respective small tack to be driven by the apparatus. This part also has radial grooves 16' (Figures 1 and 6) to ensure perfect alignment be-tween the heads 22 of the individual small tacks by supporting the end of the groove 16' on head 22' of the small tack, previously inserted, as shown in Figure 6.
Where the spacing between the tacks driven in is to be greater, the arrangement shown in Figure 7 may be used.
The fitting 43 is used instead of fitting 16, and it will be seen that this fitting 43 has a radial tongue 43' having a concave end 43" matched to the shape of the tack head.
Under the barrel 38 of this pistol apparatus there is mounted a carrier or magazine 24 which is perpendicular to the lo.ngitudinal axis of the barrel. The magazine is carried on the plate 44 and has a slidable body 46 (Figure 2) which is urged by a spring tnot shown) to cause the associated set of small tacks to be advanced towards the body 32. The tacks are shown connected to one another with the stems parallel and equidistant, and with each head held in its own casing 21. The casings 21 (Figure 4) have circular cross sections and are attachecl to one ~0376S~
another tanqentially. In addition, the carrier 24 contains two or more sets of small tacks contained respectively in casings 21 attached to one another. After the exhaustion of one set of tacks, the second set of tacks can be presented for use by la-teral dis-placement of the carrier 24 about an axis of rotation defined by connecting stud 49 (Figure 1) and the tacks of the second set can be used immediately. As seen in Fig. 2, this movement to switch from the first set of tacks to the second, is shown as a swinging movement of the upper end of carrier 24 in the direction of the arrow 24'.
The said casings 21 are made of elastic or flexible material, in particular thermo~plastics ma~eria:L. The head 22' of each of the small tacks is of more or less spherical shape and is held by the pressure of a continuous inner and elastic annular edge 21' " (Figure 3) which pushes it against the front continuous annular edge 21"", the latter having an inner diameterslightly less than the outer diameter of the head 22' of the said small tack. It is obvious that whatever the shape of these casings they will have a bore 21" to permit the passage therethrough of the rod 5 of the piston 4.
In Figure 8 there is shown a casing 21 having notched edging 21". The barrel 38 of the pistol apparatus will have an inner bore of diameter substantially equal to that of the individual casings. It is also possible, although less practical, to make the bore of the barrel 38 of square or rectangular section and to give the casings 21 the same outer shape, to ensure a more secure connection in a set between casings. One of the main ad-vantages of the pistol apparatus described is that it permits of driving in small tacks in places of difficult access such as in complete articles of furniture, since it is possible to make the barrel very long and the small tack is guided by the casing as far , .
1 03765~
as the end of the barre~. This is not possible with the pistol apparatus of most known typel in which the small tacks are not provided with casings.
Other important advantages of the pistol appa-- ratus described consist in that in the act of driving in o~ the stem of the small tack, the stem in kept accurately perpendicular in relation to the fixing plane, and in that the head of the small tack is efficiently freed from the casing.
A further advantage of the apparatus is shown by the fact that the dimensions of the inner seating of the casings may be varied, keeping their outer diameter, and thereby it is possible to accomodate in respective cases small tacks and orna-mental tacks of considerably different configuration as regards shape, diameter, height and carvature of the head 22', and length and section of the stem 22" '. These can all be driven in using the same pistol apparatus which is not possible with the pistol apparatus of known type The pistol apparatus described operates as follows:
The pistol apparatus is connected to a source of compressed air through pipe 54. Pressing the trigger 25 causes the compressed air from pipe 54 to pass through the bore 26 of the grip 2 and the bore 8 of the cylindrical body 3, driving the pistol 4 forwards. Pushed by the compressed air, the piston 4 shoots forward, displacing in its course stem 5 and in consequence the balls 30 and 30' which are trapped in the reduced part 5" of the stem 5 and against the hollow sleeve 3 and so the sleeve 32 moves with the piston 4. Advancing of the cylindrical sleeve 32 moves sleeve 34 and the lateralwings of sleeve 34 (Figure 5) into registry with a casing 21 provided with a small tack (Figure 5). This casing 21 and its tack are thus foreibly torn off and ~037~
separated form the set arranged in the carrier or magazine 24. The casing and its tack are thus pushed, until sleeve 32 reaches the end of its stroke. The point 22 of the small tack will then pro-trude by about a couple of millimeters beyond the outer face of the interchangeable spoke 16. At this point, the balls 30 and 30', which, during the advancing described, slide contained between the inner wall of the cylindrical body 3 and the reduced portion 5" of the stem 5 preventing the said stem 5 from sliding freely relative to the hollow cyllnder 32, arrive at the location of the widened portion 3" of the cylindrical body 3" of the cylindrical body 3. On reaching this position, the balls 30, 30' are now free to move radially outwardly and do so due to the reaction resulting from the compressed air thrust on piston 4 thereby enabling the piston 4 and its stem 5 to move f.reely forward relative to the body 3 and sleeve 32. Thus the stem 5, which is always under the action of the piston 4, is pushed onto the head of the small tack through the cylindrical bore 21" (Figure 3) of the casing and drives the tack from the casing into the material, whilst the said casing remains held from further advancement by the inwardly ben~ ends-of wings 35 and 35' (Figure 5) of ~he member 34.
During its advance, piston 4 forces air out of cavity 3' through bores 7 and 7' and out into the peripheral chamber 6. Furthermore, the piston 4 moves, during its advance, beyond the bore 7' in the cylindrical body 3, permitting the com-pressed air to pass out into the peripheral chamber 6 where it is accumulated for the return movement of the piston. sy releasing the trigger 25, the air pressure driving the piston is instantaneous-ly vented to atmosphere through the bore 26 and the valve(not shown) In this forwardmost position of the parts, in which the tack has been fully driven, the bodies 9 and 31 of ~a376s:1 elastic material are compressed and the air in chamber 6 is also compressed. Body 9 forces the piston 4 back relative to the sleeve 32, thus closing bore 7' and shutting cavity 3' and chamber 6 off from communication with each other. When piston 4 is moved sufficiently to the rear relative to sleeve 32 to permit reduced portion 5" of rod 5 to register with the bore 32', the enlarged portion 5' of rod 5 will contact the enlarged portion 32' with its relatively small internal diameter, which will drag sleeve 32 to the rear. The balls 30 and 30' are now forced to move back into reduced portion 5" of rod 5 by the tapered orconvergent inner surface of enlarged portion 3", which acts like a cam to force them into reduced portion 5". Thus the balls 3~' are positively cammed back into reduced portion 5", after which piston 4 and sleeve 32 with portion 32' are locked toyether to move to the right to return to the Figure 1 position of the parts. The air to the rear of piston 4 is vented through bore 26 and the valve (not shown~ upon release of the trigger 25 so as not to impede this return movement, the return movement of piston 4 being not only under the spring action of the bodies 9 and 31, but more particularly under the influence of the air compressed in chamber 6, which flows back through bores 7 and 7' for this purpose.
Automatically, the casing 21, now empty, and located between the curved wings 35 and 35' of the member 34 is brought back into its initial position in alignment with the carrier or magazine 25. Under the action of the thrust of the slide 46, the empty casing held between the curved wings of the member 34 is struck radially by the next Eull casinCJ of the set located in the carrier 24, and is compelled to slide towards the top until it touches the projecting body 60, whilst the full casing which has so pushed it enters between the wings 35 and 35' of the cylindrical body. On re-operating the trigger 25, the _ g _ 1~37~5~
advance of the piston 4, of the stem 5, of the hollow cylindrical body 32 and of the cylindrical body 34 already described, will recur. Whilst the lower part of the member 34 separates the casing containing a small nail held between the two wings of the set lo-cated in the carrier 24, the protuberance 36 (Figures 1 and 5) of the member 34 will expect the empty casiny thrusting it and pushing it forward through the opposite opening 61 (Figures 1 and 2) made in the barrel 38.
Claims (7)
1. Pistol apparatus for driving in tacks, comprising a magazine adapted to receive at least one set of tacks arranged with their stems parallel and attached to one another indirectly by means of a strip of detachably interconnected cy-lindrical casings each holding a tack, the pistol comprising a barrel having a bore which has the same internal diameter as the external diameter of the casings, plunger means reciprocable in the barrel, means to apply compressed air to the plunger means to reciprocate the plunger means relative to the barrel to detach a casing and its tack from the set and to cause both to advance through the bore and to detach the tack from the casing and to drive in the stem of the tack into material to be tacked, means on the plunger means to retract the empty casing to a position in line with said strip, means to feed the strip into the path of said plunger means whereby the advancing strip pushes said empty casing to a position out of alignment with said barrel, and a protuberance on the plunger means to contact and expel the empty casing of the tack previously driven upon advance of the plunger means to drive the next tack.
2. Apparatus as claimed in claim 1, said magazine containing at least two said sets of tacks attached to one another by their casings in plural rows disposed side by side, said magazine being hingedly mounted so as to be pivotable between positions of use in which respective said rows of tacks can be driven in.
3. Apparatus as claimed in claim 1, in which said plunger means comprises a main piston that is pushed by said compressed air and that has a stem with an enlarged portion and a reduced portion, said enlarged portion being slidably received in said empty casing retracting means comprising wings on the front portion of said hollow cylindrical sleeve that extend toward each other, the front portion of said hollow cylindrical sleeve engaging and detaching cases from said set and pushing each casing with its contained tack into said bore of the barrel, the rear portion of said hollow cylindrical sleeve being enlarged to form a second piston which slides in an intermediate hollow cylinder, said second piston having a radial bore therein, retaining balls in said radial bore, the radially inner of said retaining balls being positionable in said reduced portion of said stem, said intermediate hollow cylinder having at its front end a widened portion into which said calls can move radially outwardly to allow said main piston to move relative to said hollow cylinder thereby to permit said stem to drive the tack into the material.
4. Apparatus according to claim 3 wherein the intermediate hollow cylinder is contained in an outer body and defines with this outer body adjacent, independent and annular chambers that distribute said compressed air and that communicate with the inside of the said intermediate hollow cylindrical body by bores through said intermediate hollow cylinder.
5. Apparatus according to claim 3, wherein at the free end of the barrel there is fixed an interchangeable fitting having a bore corresponding to the diameter of the tacks and having thereon a locating portion that is engageable with the head of a tack previously inserted to spaced following tack at a predetermined position relative to the tack already driven in.
6. Apparatus according to claim 3, wherein said wings and projection slide in radial grooves of the barrel of the apparatus. 12
7. Apparatus as claimed in claim 1, wherein each casing has an inner annular elastic edge, which pushes the tack against an outer annular elastically deformable edge having an inner diameter slightly less than the diameter of the head of the tack.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1002974A CH581531A5 (en) | 1974-07-22 | 1974-07-22 | Pistol for dirving nails or tacks etc. - has two stage driving and magazine separation |
| CH694975A CH588926A5 (en) | 1975-05-28 | 1975-05-28 | Pistol for dirving nails or tacks etc. - has two stage driving and magazine separation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1037651A true CA1037651A (en) | 1978-09-05 |
Family
ID=25700473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA231,490A Expired CA1037651A (en) | 1974-07-22 | 1975-07-15 | Pistol apparatus for driving tacks, nails and the like into material |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS51145071A (en) |
| AT (1) | AT345538B (en) |
| CA (1) | CA1037651A (en) |
| DE (1) | DE2531662A1 (en) |
| FR (1) | FR2279519A1 (en) |
| GB (1) | GB1514992A (en) |
| IT (1) | IT1057901B (en) |
| NL (1) | NL7508756A (en) |
| SE (1) | SE7507642L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3921863C1 (en) * | 1989-07-04 | 1990-12-13 | Bayerische Motoren Werke Ag, 8000 Muenchen, De | Clip fastener cartridge setter - has oscillating guide piston which repeatedly hits successive clips fed at right angles through guide rail |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2923937A (en) * | 1956-05-03 | 1960-02-09 | Automatic nail gun | |
| FR1278120A (en) * | 1960-10-27 | 1961-12-08 | Improvements to nail driving devices | |
| US3266697A (en) * | 1964-10-14 | 1966-08-16 | Fastener Corp | Fastener driving apparatus |
| US3661312A (en) * | 1970-07-22 | 1972-05-09 | Illinois Tool Works | Detection and cutoff mechanism for power driven devices |
| DE2042767C3 (en) * | 1970-08-28 | 1981-01-29 | Hilti Ag, Schaan (Liechtenstein) | Powder-powered setting tool for driving nails |
| BE789617A (en) * | 1971-10-04 | 1973-02-01 | Inzoli Giovanni | PNEUMATICALLY ACTUATED DEVICE, ESPECIALLY USED FOR THE QUICK INTRODUCTION OF KEYS AND THE LIKE |
| DE2211511A1 (en) * | 1972-03-10 | 1973-09-20 | Dieter Haubold Ind Nagelgeraet | MAGAZINE STRIP FOR A DEVICE FOR DRIVING DECORATIVE NAILS |
-
1975
- 1975-06-25 GB GB26899/75A patent/GB1514992A/en not_active Expired
- 1975-07-03 SE SE7507642A patent/SE7507642L/en unknown
- 1975-07-03 FR FR7520959A patent/FR2279519A1/en active Granted
- 1975-07-15 IT IT50537/75A patent/IT1057901B/en active
- 1975-07-15 CA CA231,490A patent/CA1037651A/en not_active Expired
- 1975-07-16 DE DE19752531662 patent/DE2531662A1/en not_active Withdrawn
- 1975-07-17 AT AT555575A patent/AT345538B/en not_active IP Right Cessation
- 1975-07-22 NL NL7508756A patent/NL7508756A/en not_active Application Discontinuation
- 1975-07-22 JP JP50088925A patent/JPS51145071A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1514992A (en) | 1978-06-21 |
| SE7507642L (en) | 1976-01-23 |
| JPS51145071A (en) | 1976-12-13 |
| FR2279519B1 (en) | 1979-05-18 |
| IT1057901B (en) | 1982-03-30 |
| FR2279519A1 (en) | 1976-02-20 |
| AT345538B (en) | 1978-09-25 |
| ATA555575A (en) | 1978-01-15 |
| NL7508756A (en) | 1976-01-26 |
| DE2531662A1 (en) | 1976-02-05 |
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