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Publication numberUS3786978 A
Publication typeGrant
Publication dateJan 22, 1974
Filing dateJun 5, 1972
Priority dateJun 5, 1972
Also published asDE2328324A1
Publication numberUS 3786978 A, US 3786978A, US-A-3786978, US3786978 A, US3786978A
InventorsManganaro G
Original AssigneeElectro Matic Staplers Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electromagnetic stapler
US 3786978 A
Abstract
This electro-magnetic stapler is hand held and has a circuit including a trigger switch, which when actuated, energizes an electro-magnetic load coil to operate the stapler. When the trigger is held in an actuated condition for sufficient time the operation of the stapler is repeated. A safety switch controlled by work engaging means on the stapler, prevents operation of the stapler unless said work engaging means contacts the work piece. The staple driving blade is at the front end of the stapler to facilitate locating the stapler relative to the place where the stapling is to be done. The trigger switch assembly permits a smooth operation. The assembly of the stapler permits a pair of split plastic covers to be removed without effecting the innards of the stapler. The plunger movement is shock absorbed at opposite ends of its movement. The circuit parts and components are housed in the stapler and mounted on a non-conductive plate disposed in the handle portion of the stapler.
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Manganaro [111 3,786,978 [451 Jan. 22, 1974 4] ELECTROMAGNETIC STAPLER [75] Inventor: George F. Manganaro, Lake Hiawatha, NJ.

[73] Assignee: Electro-Matic Staplers, Inc.,

Woodcliff Lake, NJ.

[22] Filed: June 5, 1972 [21] Appl. No.: 259,398

Primary ExaminerGranville Y. Custer, Jr.

Attorney, Agent, or Firm-Marvin Feldman; J. B. Felshin [5 7] ABSTRACT This electro-magnetic stapler is hand held and has a circuit including a trigger switch, which when actuated, energizes an electro-magnetic load coil to operate the stapler. When the trigger is held in an actuated condition for sufficient time the operation of the stapler is repeated. A safety switch controlled by work engaging means on the stapler, prevents operation of the stapler unless said work engaging means contacts the work piece. The staple driving blade is at the front end of the stapler to facilitate locating the stapler relative to the place where the stapling is to be done. The trigger switch assembly permits a smooth operation. The assembly of the stapler permits a pair of split plastic covers to be removed without effecting the innards of the stapler. The plunger movement is shock absorbed at opposite ends of its movement. The circuit parts and components are housed in the stapler and mounted on a non-conductive plate disposed in the handle portion of the stapler.

24 Claims, 9 Drawing Figures PATENTEB 24221914 SREEIIUFII FIGQ PATENTED 3.786.978

sum t [If 4 ELECTROMAGNETIC STAPLER This invention relates to electro-magnetic staplers.

One object of this invention is to improve the electromagnetic stapler disclosed in US. Pat. No. 3,589,587, granted June 29, 1971.

Another object of this invention is to provide a stapler of the character described, provided with safety means to prevent operation of the stapler upon actuating the trigger unless the stapler is positioned on the work piece, to prevent accidental operation of the stapler.

Yet another object of this invention is to provide a stapler of the character described in which the staple driving blade is at the front end of the stapler so as to facilitate location of the point at which the stapling takes place.

Still another object of this invention is to provide an electro-magnetic stapler of the character described which shall be relatively easy to assemble, in which the components of the control circuit are mounted on a non-conductive member affixed to the metal frame of the stapler and housed in the handle portion of the stapler and in which the metal frame is housed in split plastic half-covers attached together and to the frame so as to house the frame.

Yet another object of this invention is to provide in an electromagnetic stapler of the character described, a highly improved trigger which shall be easy to actuate and which shall readily return to normal, unactuated condition, when released, and which when actuated, shall close a switch to control energization of an electro-magnet to operate the stapler.

A further object of this invention is to provide a strong and durable stapler of the character described which shall be positive in operation and which shall yet be practical, safe and efficient to a high degree in use.

Other objects of this invention will in part be obvious, and in part hereinafter be pointed out.

This invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of invention will be indicated in the following claims.

In the drawings:

FIG. 1 is a side elevational view of an electromagnetic stapler embodying the invention, with parts broken away and in cross-section;

FIG. 2 is a cross-sectional view taken on line 2-2 of FIG. 1;

FIG. 3 is a cross-sectional view taken on line 3-3 of FIG. 1;

FIG. 4 is a front elevational view of the stapler;

FIG. 5 is a side elevational view of the stapler with the covers removed;

FIG. 6 is a top plan view of the structure shown in FIG. 5;

FIG. 7 is a crosssectional view taken on line 7-7 of FIG. 5;

FIG. 8 is a cross-sectional view' taken on line 8-8 of FIG. 5 and;

FIG. 9 is a wiring diagram of the circuit for controlling the electro-magnet which operates the staple driving blade or knife:

Referring now in detail to the drawings, 10 designates an electro-magnetically controlled stapler embodying the invention. Said stapler 10 comprises a metal body 11 made of two symmetrical, substantially similar metal frame members 12 and 13.

Frame member 12 comprises a horizontally extending lower wall portion 12a disposed in a vertical plane and having an upper horizontal edge 12b, a lower horizontal edge 12c and a rear edge 12d. At the forward end of wall 12a is an outwardly bent portion 12f from which there extends forwardly a downwardly and inwardly converging inclined wall 12g.

Member 12 further comprises a vertical wall 12h disposed forwardly and above wall 12f and outwardly of the plane of wall 12a. Wall 12h extends upwardly and forwardly and comprises portions 12hl. Extending from wall 1211 is a part cylindrical wall 12j joined to wall 12g by a lower shoulder 12k and to wall portion 12h3 by a top shoulder 12m. Wall portion l2h2 is disposed forwardly of wall l2j; wall portion l2h3 is disposed above shoulder 12m and wall portion 12h] is disposed rearwardly of wall 12j. Extending inwardly from the rear side of the upper end of part cylindrical wall 12j is a shoulder 1214, from which extends rearwardly a vertical flange 12w in the plane of wall 12a.

Frame member 12 also has a top horizontal flange 12n and a rear vertical flange 12p. Frame member 12 also has a rear upstanding arm 12x. Frame member 13 is like member 12 and is fixed thereto in spaced, syrnmetrical relation, in the manner hereinafter appearing. Parts of member 13 corresponding to similar parts of member 12 are designated by numeral I3 followed by a corresponding letter, the same way that the parts of member 12 are designated.

Wall portion 12h has a vertical front edge 12s, and a second intermediate vertical edge 12! disposed somewhat rearwardly of said front edge. Portions 12h, 13h of frame members 12, 13 form part of a front head for the stapler, as will appear hereinafter. Disposed between the flange l2w and the corresponding flange 13w of member 13, is a trigger housing 15 made of plastic, open at its underside and having a horizontal wall 15a from which extends downwardly, a front wall 15b, a rear wall 15c and side parallel walls 15d forming a socket open at the bottom and in which a trigger member 18 is slidably mounted. Trigger 18 projects below the trigger housing. Extending up from horizontal wall 15a is a flange 15f lying against the inner surface of flange 12w. A non-conducting plastic plate 17 disposed in a verical plane, and in the shape of a handle, has one end at the inner surface of the flange 13w of frame member 13 and its other end contacts the inner surface of arm 13a of member 13. Between the forward end of plate 17 and flange 15f of trigger housing 15, is a micro-switch 28 provided at its underside with a switch actuator button 29 projecting down through a hole 20 in wall 15a.

Trigger 18 has limited sliding, up and down movement in the trigger housing socket. To this end, one wall 15d of the housing has a vertical slot 22 receiving a transverse pin 23 on the trigger. The lower end of the trigger is curved upwardly as at 18a and projects below the trigger housing 15. Said trigger has two upwardly opening bores 18b receiving compression springs 23a, 24 which bias the trigger downwardly to a nonoperative position. One of the bores 18b is aligned with opening 20. A switch acutating member 24a rests on the spring 23 in the bore which is aligned with the opening 20 and actuator button 29 to operate said button when the trigger is pulled up.

The plate 17 and micro-switch 28 are fixed to flange f, flange 12w of member 12 and the corresponding flange 13w of member 13 by transverse screws 25.

The trigger housing 15 is formed with a pair of opposed, outwardly extending lugs 15h, which engage complimentary flange 13w of member 13, to properly position the trigger housing relative to frame 12.

Fitted over the front of frame 12 is a front metal cover member 30. Said member 30 comprises a front wall 31 contacting front edges 12s and 13s of the frame members 12,13, respectively. Extending rearwardly from the side of front wall 31 are side flanges 32 contacting outer adjacent surfaces of frame members 12,13. Front wall 31 has two vertical slots 33 near its lower end to receive front ends of a staple magazine, as will be explained hereinafter. The lower ends of side walls 32 are inclined downwardly and inwardly, as at 34. Walls 34 extend rearwardly and have upwardly extendingears 35 formed with openings 36 registering with similar openings in walls 12h! and 13111 of members 12, 13 respectively.

Front wall 31 of cover 30 has a forwardly recessed, central, vertical portion 31a'terminating short of the upper and lower ends of said front wall.

Surrounding the frame members 12, 13 and the front cover 30 are a pair of similar, symmetrical, heat and electrical insulating cover members 40 having meeting edges 41 along a central vertical plane. Said members 40 have lower horizontal portions 40a, front portions 40b, and handle portions 40c so as to form a hand hole 42 into which the trigger 18 projects. The cover members 40 are fixed to each other and to the frame members 12, 13 by a transverse bolt or rod 44 passing through openings 32b, bolt or rod 45 passing through openings 36, and bolt or rod 46 passing through a hole 47m plate 17 and through aligned openings in cover members 40. Arms 12x, 13x of members 12, 13 are fixed to the rear lower end of plate 17 by a bolt 48 which also serves to attach together cover members 40. A spacer sleeve 50 on the rough bolt 48 is interposed between plate 17 and arm 12x. Bolts 44, 46 may have spacer shoulders to keep members 12, 13 in properly spaced relation.

Mounted on shoulders 12k, 13k and between walls l2j, 13] of members 12, 13, is a base plate 52 having a front edge 53 formed with a central flat groove 54. The rear edge 52a of base 52 may be rounded. Mountedon base 52 is a metal cup 55 having a bottom wall 56 from which a cylindrical wall 57 extends upwardly. Bottom wall 56 has a central hole 58. The cup 55 is fixed to base 52 by a central stem 61 passing through hole 58 and hole 62 in base 52, and a top flange 63 contacting the top surface of wall 56. On bottom wall 56 is a central insulating sleeve 65 fitted over said upper flange 63. On wall 56 is an insulating apertured disc 66. On said disc is an outer insulating cylincover plate having diametrically opposed side lugs 76 projecting through suitable notches 77 at the upper end of said wall 57 and through suitable slots 78 in said walls 12j, 13j of frame members 12, 13. The upper end of central sleeve 65 projects up into a central opening 79 formed in said cover plate as shown in FIGS. 1 and 7.

Near the upper ends of walls 12], 13j are formed slots 80. A top fiat disc 81 has outwardly extending flanges 82 projecting into said slots 80. Disc 81 has a central opening 83. Slidably passing through said opening 83 is a stem 84 of an armature 85. Pinned to the upper end of stem 84 as at 86 is a spring retainer member 87. Mounted on top of disc 81 is a spring supporting dish 88. Between dish 88 and retainer member 87 is a conical coil compression spring 90 which biases the armature upwardly. At the lower end of stem 84 is a thicker cylindical portion 91 forming an upper shoulder 92 on which a rubber like annular bumper 93 rests. Bumper 93 surrounds the stem 84. Below the thicker portion 91 is a plunger portion 95, the lower end of which is slidably received in the upper end of central sleeve 65. When the coil 130 is deenergized, the spring raises the armature to its uppermost position. At the upper end of plunger 95 is an annular shoulder 96. A metal disc 97 rests on the shoulders 96 and surrounds the thicker armature portion 91. Surrounding the upper end of plunger 95 is a second rubber like bumper 98 fixed to the underside of disc 97. Rubber of bumper 93 may be fixed to armature 85 to reciprocate therewith and with disc 97.

When coil 130 is energized in the manner hereinafter explained, to pull down the armature 85, bumper 98 will strike cover 75. When the coil is deengergized in the manner to be described hereinafter, the spring 90 raises the armature 85 and bumper 93 strikes the underside of disc 81.

Disc 97 has a forwardly extending lug 99 projecting into the space formed by forwardly recessed wall 31a of the cover 30. A staple driving blade 100 has a slot 100a near its upper end receiving said lug 99. Said blade 100 also slides in groove 54 in plate 52 (See FIG.1). Thus, when the coil 130 is energized, the armature 85 is moved down to drive a staple from the forward part of a staple magazine 101 to be described hereinafter.

It is to be noted that the plastic covers the upper end of the forward or head part of the stapler as shown at 40d (FIGJ). The plastic covers 40 also cover the front surface of metal cover 30 as at 40c, but cover portion 40c terminates above slots 33 (See FlG.1

In the lower end of the stapler and between the lower portions of members 12, 13 is the staple magazine 10] which may be of any suitable construction. Said magazine 101 way comprise a magazine housing 102 having a flat bottom wall 103 from which parallel side walls 104 extend upwardly (See FlG.3). The wall 103 is located at the lower edges 12c, 130 of members 12, 13. At the front end of side walls 104 are lugs received in slots 33. At the rear end of walls 104 are upright apertured ears 105 receiving a transverse bolt 106 mounted on members 12, 13. In the magazine housing 101 is a staple guide 110 having a bottom wall 111 fixed centrally to bottom wall 103. Extending up from wall 111 are parallel walls 112. The staples ride on the staple guide and between said guide and the staple magazine housing. The rest of the staple magazine may be of usual construction for driving the foremost staple down between the front wall of front cover 30 and the front end of the staple guide.

Walls 104 of the magazine housing 102 are in vertical planes spaced inwardly of members 12, 13. Mounted on bolt 45 and between members 12, 13, for oscillation is a safety switch actuating device 110a. Said device 110a comprise a member 111a having similar, parallel side arms 112 in vertical planes passing between walls 104 and members 12, 13. Said side arms 112 are inclined forwardly and downwardly and normally project downward below the underside of walls 12a, 130 just behind the plane of ejection of staples. Said arms 112 are interconnected by a cross portion 113 and have apertured ears through which said bolt 45 passes.

Fixed to the upper side of cross-portion 113 is a control strip spring 115 having a forwardly extending arm 116 contacting the underside of member 59 and a rearwardly extending arm 117 disposed horizontally. Mounted on and between side walls 12a, 13a of members 12, 13 is a support plate 118 on which is mounted a micro-switch 119 provided with an upwardly extending switch actuator button 120 contacting the underside of spring arm 117. When the stapler is off a work piece, the button 120 is in an inoperative position. When the stapler is placed on a workpiece, member 110a is rotated to depress the button 120 and thereby actuate the micro-switch 119 for the purpose hereinafter appearing.

On plate 17 are a pair of terminals 125, 126 to which conductor wires 184, 196 are attached. Plate 17 is notched as at 17a between terminals 125, 126. Said wires 184, 196 pass through an opening 129 in plastic cover 40 and form cable 124. A grip bushing 129a in said opening 129 holds the cable 124 tightly in place. A tranverse bolt 124a may pass through aligned holes in portions 12w, 13w of frame members 12, 13 within the cover 40.

The electro-magnetic coil 130 is controlled by an electric circuit shown in FIG. 9 of the drawing. This circuit is the same as the circuit shown in FIG. of my US. Pat. No. 3,589,587, except for a change which will be later described. Numerals designating parts of the circuits of FIG. 9 herein, where applicable.

All the components of the circuit connected to wires 184, 196 except coil 130 and wires leading thereto and therefrom, are mounted on plate 17, and are covered or embedded insulating material.

Normally, when the trigger 18 is not raised, a switch 123, controlled by actuator 29, in in contact with contact 180. When the trigger is actuated, switch 123 disengages from contact 180 and engages contact 181.

The difference between the FIG. 10 circuit of the aforesaid US Patent and the circuit shown in FIG. 9 herein, is that wire 205 of the former circuit, in the present circuit, is broken into parts 205, 205a which may be bridged by a switch 300 which is normally open but is closed to connect wires 205, 205a only when the stapler is on the work piece and switch member 110a has been rotated in a clockwise direction viewed at FIG. 1 of the drawing herein, to operate the actuator button 120 of the micro-switch 119.

The circuit of FIG. 9 will now be described.

One side of said load coil 130 is connected by wire 182 to a rectifier anode 183 which is connected by wire 184 to a plug. Switch 123 is connected by wire 185 to a capacitor 186 which is connected by wire 187 to one side of a resistor 188. The other side of the resistor 188 is connected to rectifier 189, by a wire l87ab. Rectifier or anode 189 is connected by wire 190 to said wire 184.

Contact is connected by wire 191 to a wire l87ab. The other side of load coil 130 is connected by wire 192 to the anode side of a gated silicon rectifier or SCR 193. The cathode side of said SCR 193 is connected by wire 194 to one side of a rectifier or diode 195. The other side of rectifier or diode 195 is connected to wire 196. Resistor 198 is connected to diode 195 in parallel circuit.

Connected to wire 192 is a wire 200 connected to one side ofa resistor 201. The other side of resistor 201 is connected by wire 202 to one side ofa capacitor 203. The other side of capacitor 203 is connected by wire 204 to wire 196.

Wire 194 is connected by wires 205,205a in rough switch 309 to a neon lamp 206. Said lamp is connected by wire 207 to contact 181. Wire is connected to wire 187 by resistor 187a so that resistor 187a and capacitor 186 are in parallel circuit.

The plug is connected by ground wire 210 to the body 12,13. The wires 210, 184, 196 passing from plug P to the tool comprise the line cord or cable 124.

The components of the circuit other than the load coil 130, the trigger switch 123 and contacts 180, 181 are mounted in any suitable manner on the insulating plate 17.

The plug has blades 224, 225, 226 connected to wires 210, 184 and 196, respectively.

The load coil is locked in place when the body parts are assembled.

The operation of the circuit will now be described, with the assumption that the tool is on the work piece and the switch 300 is closed:

The switch 123 is normally in engagement with contact 180. The capacitor 203 charges through rectifier or diode 183, load coil 130 and resistor 201, while the tool is not operating. The trigger switch may be closed randomly and when the trigger switch 123 is actuated and moves into engagement with contact 181, capacitor 186 draws current and turns on SCR 193 during the negative cycle of alternating current from an outlet to which the plug 12a is connected. If the switch should close during a positive half cycle of the supply rectifier or diode 189 prevents flow of current until the line reverses polarity. With the line negative gate current flows from the line through the SCR 193 gate, the switch 123, resistor 188 and rectifier or diode 189 to charge capacitor 186. Current has to take this path because diode prevents current flow directly from the line in the reverse direction to the switch. SCR 193 will trigger as soon as gate current flows because the SCRs diode is always forwardly biased by previously charged capacitor 203. With SCR 193 gated on, the discharge time constant of the resistor 201, capacitor 203 network and SCR 193 is long enough to maintain SCR 193 in conduction until the line once more reverses polarity. However, SCR 193 does not conduct until the line turns positive. When line turns positive the neon lamp 206, fires, discharging the capacitor 203 thereby causing the SCR 193 to conduct.

The SCR 193 turns off when the line turns negative again. SCR 193 can only conduct when the capacitor 186 draws currentnThe delay period between pulses depends on the value of resistor 187a which acts as a bleeder resistor across capacitor 186. The larger the valve of said resistor 1870, the slower the frequency of the pulse.

As long as switch 123 is kept in closed position, in engagement with contact 181, the tool will operate to drive a staple at predetermined intervals, repeatingly.

The SCR 193 will always become conductive at the beginning of a positive cycle of the alternating current and will automatically shut off until the next pulse.

If the switch is closed and then opened in less time than the predetermined interval, there will be only one pulse and no further pulsing will take place until the switch is closed again.

Opening of switch 123 (from contact 181 to contact 180 cuts out capacitor 186 and prevents further pulsing).

Upon lifting the tool off the work piece, switch 300 opens and no pulsing can take place. This is a safety feature to prevent ejection of staples when the tool is held in the air, that is uplifted from the work piece.

It will thus be seen that there is provided an article in which several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As possible embodiments might be made of the above invention and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings, is to be interpreted as illustrative only.

The armature 35 is guided at its lower end in the sleeve 65 of the coil, and at its upper end in disc 81. The plate 97 is disposed between the coil and said disc. Hence the armature is guided for true up and down movement, to facilitate its moving the driving blade 100 up and down without jamming.

What is claimed is:

l. A staple driving tool comprising a body, a load coil in said body, said coil having a central opening, an armature disposed in said body and axially slidable in said hole, for movement by said coil when the coil is energized, staple driving means fixed to said armature and disposed at the front of the body, a staple magazine at the lower end of said body, a trigger switch on said body, and circuit means including said coil and switch, to automatically energize said coil upon actuating said switch, and safety switch means in said circuit and located at the front of the body, to prevent energizing of the coil unless the lower front end of the tool is on a work piece in position for stapling, said body comprising a pair of symmetrical frame members, said load coil being disposed between said frame members, said staple magazine being disposed between said frame members, said trigger switch comprising a trigger housing disposed between said frame members, a trigger slidable in said trigger housing, a micro-switch on said trigger housing, means to actuate said micro-switch upon moving the trigger in said trigger housing in one direction, and means to fix said staple magazine, said trigger housing, said micro-switch said safety switch and said coil to said frame members and to fix said frame members to each other.

2. The combination of claim 1, and a pair of insulating cover members on said body, said attach means including means to attach said cover members to said body.

3. A stapler comprising a body, said body comprising a pair of similar, symmetrically disposed, spaced, metal frame members having lower horizontally extending portions and vertical portions extending upwardly from the front ends of said horizontal portions, a handleshaped insulating plate connecting an upper end of the vertical portion of one of said frame members with the rear end of the horizontal portion of said one frame member, a trigger between said frame members, a micr0-switch above said trigger housing and between said frame members, a trigger slidably mounted in said trigger housing, spring means to lower said trigger; and means to actuate said micro-switch upon raising said trigger.

4. The combination of claim 3, an electromagnetic coil between the vertical portions of said frame members, an armature for said electromagnetic coil, slidably mounted therein, spring means to raise said armature, a staple driving blade mounted on said armature for reciprocation therewith, and means to fix said trigger housing, said micro-switch and electro-magnetic coil to and between said frame members.

5. The combination of claim 4, a cup receiving said electro-magnetic coil, said cup comprising a bottom wall from which a cylindrical wall extends upwardly, said coil being housed in said cup, a cover on said cup having lugs extending outwardly from said cover and beyond said cylindrical wall, and said frame members having part cylindrical portions contacting said cylindrical wall and formed with slots receiving said lugs.

6. The combination of claim 5, a base disposed below the bottom wall of said cup and means to fix said base to said bottom wall.

7. The combination of claim 6, a disc disposed in spaced relation above said cup and between said frame members and having edges contacting the partcylindrical walls thereof, and having outwardly extending lugs, said part cylindrical portions having slots receiving said lugs on said disc.

8. The combination of claim 7, an armature slidable in the coil and extending thereabove, a plate fixed to said armature for movement therewith and disposed below said disc and spaced above said cover, said plate having a forwardly extending projection, and a staple driving blade mounted on said projection for reciprocation with said armature.

9. The combination of claim 8, and a pair of bumpers fixed to said armature, one above and one below said plate, for contacting said disc and cover respectively.

10. The combination of claim 9, a shallow dish on said disc, a coil compression spring on said shallow disc and surrounding the upper end of said armature, and stop means at the upper end of said armature contacted by the upper end of said compression spring, whereby said compression spring raises said armature from lowered position, upon disengaging said coil.

11. A stapler comprising a body, said body comprising a pair of symmetrically disposed spaced frame members having lower horizontally extending portions and vertically extending portions extending upwardly from the front ends of said horizontally extending portions, said upwardly extending portions having part cylindrical outwardly recessed portions, a cup disposed between said part cylindrical shaped portions, said cup comprising a bottom wall from which a cylindrical wall extends upwardly a load coil housed in said cup having a center hole for slidably receiving a cylindrical armature extending thereabove, a cover at the upper end of said cup and having a center hole, for slidably receiving the lower end of said armaturee, registering with armature, center hole in said coil, said cover having lugs, said cup having notches receiving said lugs, said part cylindrical portions having slots receiving said lugs, and means to attach said frame members to said cup.

12. The combination of claim 11, a disc disposed in spaced relation above said cup and between said frame members and having edges contacting the partcylindrical walls thereof, and having outwardly extending lugs, said part cylindrical portions having slots receiving said lugs on said disc, said disc having a central hole therein to slidably receive an upper portion of the armature.

13. The combination of claim 11, a base disposed below the bottom wall of said cup and means to fix said base to said bottom wall.

14. The combination of claim 12, a plate fixed to said armature for movement therewith and disposed below said disc and spaced above said cover, said plate having a fowardly extending projection, and a substantially flat staple driving blade mounted on said projection for reciprocation with said armature.

15. The combination of claim 14, and a pair of bumpers fixed to said armature, one above and one below said plate, for contacting said disc and cover respectively.

16. A staple driving tool comprising a body, an electro-magnetic load coil means in said body, means to fix said coil means to said body, said coil means having a central hole, an axial armature having its lower end slidably received in said hole and guided by said coil means for vertical reciprocation, upper guide means fixed to the body coaxially of said coil means and having means to slidably receive and guide said armature for vertical reciprocation, a member fixed to said armature and disposed between said coil means and said upper guide means and offset forwardly of said armature, a staple drive blade mounted on said member and disposed at the front of the body and parallel to said armature and means on said body to guide said drive blade for vertical movement with said armature in parallel spaced relation thereto.

17. A staple driving too] comprising a body, a load coil in said body, an armature disposed in said body for movement by said coil when the coil is energized, staple driving means on said armature, a staple magazine at the lower end of said body, a trigger switch on said body, and circuit means including said coil and switch to automatically energize said coil upon actuating said switch, means to fix said coil to said body, said coil having means to slidably receive and guide the lower end of said armature, upper guide means fixed to the body, to slidably receive and guide the upper end of said armature, said staple driving means being disposed parallel to and spaced from said armature, and outside said coil and at the front of said body and being fixed to said armature between said coil and upper guide means, said body comprising a pair of spaced, symmetrically disposed frame members, said coil being disposed between said frame members, said upper guide comprising a disc disposed in spaced relation above said coil and between said frame members and above said member fixed to said armature, and safety switch means in said circuit to prevent energizing of the coil unless the lower front end of the tool is on a work piece in position for stapling.

18. A staple driving tool comprising a body, a load coil in said body, an axial armature disposed in said body for movement by said coil when the coil is energized, said armature comprising a lower portion slidably received in said coil, and a top portion extending above said coil, an upper guide means on the body having a hole to slidably receive said top armature portion and means on the body having a hole constituting lower guide means for said lower armature portion, staple driving means fixed to said armature between the upper guide means and lower guide means, a staple magazine at the lower end of said body, a trigger switch on said body, and circuit means including said coil and switch to automatically energize said coil upon actuating said switch, and safety switch means in said circuit to prevent energizing of the coil unless the lower front end of the tool is on a work piece in position for stapling.

19. The combination of claim 18, said staple driving means comprised a substantially flat blade and an attaching member mounted to said blade and to said armature.

20. The combination of claim 19, said attaching member being horizontally disposed and spaced between said upper and lower guide means.

21. The combination of claim 18, a cup receiving said load coil, said cup comprising a bottom wall from which a cylindrical wall extends upwardly, said coil being housed in said cup.

22. The combination of claim 21, and means at the bottom of said cup to guide said drive blade for vertical movement with said armature in parallel spaced relation thereto.

23. The combination of claim 22, said drive blade guide means comprising a plate fixed to the bottom of said cup and said staple drive blade guide means being located at the forward end of said plate.

24. The combination of claim 16 wherein said armature has an upper portion of lesser diameter than said lower end thereof, and said coil means comprises lower guide means to guide said lower end of said armature and said upper guide means guides said upper portion of said armature.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4033500 *Mar 26, 1976Jul 5, 1977Electro-Matic Staplers, Inc.Electromagnetic stapler and safety trigger therefor
US4108345 *Jun 16, 1977Aug 22, 1978George Frank ManganaroElectromagnetic stapler and safety trigger therefor
US4183453 *Feb 23, 1978Jan 15, 1980Swingline, Inc.Electronically operated portable fastener driving tool
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Classifications
U.S. Classification227/8, 227/131
International ClassificationB25C5/00, B25C1/06, B25C5/15, B25C1/00
Cooperative ClassificationB25C1/06, B25C5/15
European ClassificationB25C1/06, B25C5/15