US3110898A

US3110898A - Stapling machine

Info

Publication number: US3110898A
Application number: US63381A
Authority: US
Inventors: Haubold Dieter
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-10-20
Filing date: 1960-10-18
Publication date: 1963-11-19
Anticipated expiration: 1980-11-19

Description

Nov. 19, 1963 D. HAuBoLD 3,110,898-

STAPLING MACHINE esheetssnet 1 Filed Oct. 18, 1960 ATTOTLN EBS Nov. 19, 1963 D. HAUBOLD STAPLING MACHINE 6 Sheets-Sheet 2 Filed OGL. 18, 1960 U .Wfl

INVENIOR DIETER HAuBo'LD ATTORNEYS Nov. 19, 1963 D. HAuBoLD STAPLING MACHINE 6 Sheets-Sheet 3 Filed OCT.. 18, 1960 /NVE/vrO/P D. H au o /Q/ ATTO (LN-E55 Nov., 19, 1963 D. HAUBOLD 3,110,898

STAPLING MACHINE Filed Oct. 18, 1960 6 Sheets-Sheet 4 INVENTOR DIETER HAUBOLD m; Mula v6 m* ATTORNEYS Nov. 19, 1963 D. HAUBOLD STAPLING MACHINE Filed oct. 18,1960

6 Sheets-Sheet 5 J3 J M@ A 9 2v MM JMMWMJ /Nl/ENrOQ Haube/Cf muww Nov. 19, 1963 D. HAUBQLD 3,110,898

STAPLING MACHINE Filed Oct. 18, 1960 6 Sheets-Shes*l 6 INVENTOR DIETER HAUBoLD ATTORNEYS United States Patent O 3,110,898 STAPLING MACHINE Dieter Haubold, Lutzowstr. 8-10, Hannover, Germany Filed Oct. 18, 1960, Ser. No. 63,381 Claims priority, application Germany Oct. 20, 1959 6 Claims. (Cl. 1-49) This invention relates to stapling machines and refers more particularly, although not exclusively, to stapling machines of the type used for driving fasteners into a yielding base.

Fasteners such as U-shaped -wire staples, nails, hooks, pins and the like, are usually joined into strips by means of a binding agent, `and these strips are then inserted into the magazine ofthe stapler, These strips must have a suicient strength to prevent their breaking when being transported or .inserted into the magazine. It follows that, when driving in the fastener, the operator has t exert a substantial force upon the driver -in order to separa-te an individual fastener from the strip and to drive it out of the guideway of the implement into the tacking base. In ease of a yielding, resilient base, the pressure necessary to separate the individual fasteners from their strip is a multiple of the pressure needed to drive the fastener into the base. Thus the operator is needlessly tired by having to exert a great deal of pressure in order to separate each fastener from its strip. Moreover, this high separating pressure will easily` damage the yielding base or the workpiece which is to be fastened to the base. This can take place, for example, in the building trade when attaching fberboard, insulation board, light boards made out of mineralized wood-wool etc. In other trades, p

too, it is often necessary to drive fasteners into a yielding base, for example, in the wreath binding business where leaves, pieces of moss and the like must be attached to a straw core. Heretofore, this work was done through the use of wire staples which were thrust into the straw core manually; obviously this is `an irksome and tedious labor.

An important object of the present invention is to facilitate the work `of an operator by providing a handoperated stapling machine which is capable of exerting at the start of the driving-in operation, a high pressure on the driver for the purpose of separating each individu- Ial fastener from. its strip and, subsequently, la lower pressure for the purpose of driving the separated fastener into the base without it being necessary for the operator to exert any yadditional pressure.

It is another object of the present invention to provide a hand-operated stapling device capable of producing at the initial stage, i.e. at the time of the separating operation, a multiple of the pressure produced at the time of the driving-in operation, both pressures resulting from the same constant pressure exerted by the hand of the operator.

It is still another object of the invention to provide a hand-operated fastener-applying device increasing by static means at the time of the separating operation, the constant, or @approximately constant, pressure exerted by the hand of the operator. n

It is yet another object of the invention to provide for a hand-operated tacking device, dynamic means in order to produce at the time of the separating operation, as the result of a constant pressure exerted by the hand of the operator, a higher pressure than during the drivingin operiation.

Further objects will become apparent from the following specification which describes, by way of example, several forms of construction of the invention, as illustrated by the accompanying drawings.

In the drawings:

FIG. l is a longitudinal section of an embodiment of "ice a staplilng machine incorporating the novel features of the present invention, in its inoperative position.

FIG. la is similar to FIG. l, but shows the machine in its operative position.

FIG. 2 is the front view of FIG. 1,

FIG. 3 is a longitudinal section of another embodment of the stapling machine according to the invention, in lits inoperative position,

FIG. 3a is` similar to FIG. 3, but shows the machine in its operative position,

FIG. 4 is a front View of FIG. 3,

FIG. 5 is the longitudinal section of still another embodiment of a stapling machine in accordance with the invention, in its inoperative position,

FIG. 5a is similar to FIG. 5, but shows the machine in its operative position,

FIG. 6 is a part yof the longitudinal section of still another embodiment of a stapling machine according to the invention.

The stapling machine shown in FIGS. l, 1a Iand 2 comprise a hand lever 1 pivoted upon a transverse pin 2 carried by spaced upstanding flanges 3 at the reanward end of the machine frame. A driver 5 is slidably guided in a guide 4 constituting the forward end of the machine frame. The driver 5 separates in the course of the tacking operation, one 'of the fasteners, such as U-shaped wire staples, from Ia staple strip inserted into the magazine 6, and drives the fastener into a base. A helical spring 7 is attached to the rear end of the hand lever 1 and is used to keep it in the rest position shown in PIG. l. At the .forward end of the hand lever 1 there is a pin 8 lirmly connected with the driver 5 and movable in an elongated slot provided in the guide 4. The pin 8 is an extension of a supporting arm 10 mounted inside the hand lever 1.

Pivoted to the front end of the supporting arm 10, 0n a `transverse bolt 11 is'an intermediatelever 12 spaced from the supporting arm 10 by means of a pressure spring 14. The front end 13 of this intermediate lever i12 extends beyond the hand lever 1 ,and is movable in an elongated slot provided in the guide 4. The rear end of the intermediate lever 12 carries a pivot 1S, supporting a revolving roller 16, which abuts against an inner surface of the upper part of the hand lever 1. In the rest position shown in FIG. l, the front end 13 of the intermediate lever 12 is adjacent to the xed upper end 17 of the guide 4, the clearance between the front end 13 and the upper end of the Idriver 5 amounting to merely one to three millimeters.

The distance between the bolt 11 of the intermediate lever 12 land the axis 15 of the roller 16 is a multiple of the distance between the bolt =11 and the fixed implement par-t 1'7 so that the lever arm .1-1--15 is a multiple of the lever arm I11-1'7, the relation between the Itwo lever arms being about 5:1.

When applying the fastener, the hand of the operator holds the hand lever 1 and presses the implement against the tacking base, thus causing the hand lever 1l Ito pivot downwards on the axis 2 while counteract-ing the force of the helical spring 7. This causes the intermediate lever 12 to pivot clockwise on the bolt 11. The clockwise movement of lever 12 will cause front end 13' and pin 8 to separate. Front end 13 is against implement part 17 and pin 8 'is connected to driver 5 so that the separation of end 13 and pin 8` will cause an initial depression of driver 5. Due to the relation between the lever arms of iever 12, the operator applied force will be quintupled in this separation movement. Thus this initial depression causes the driver to separate the tirst staple from the strip in the magazine with relatively little exertion.

When the hand lever I1 lis then pushed down still further y the force exerted by the hand of the operator will engage directly, without any intermediate transmission, the driver 5 which now drives the staple, already separated from the strip, into the tacking base. When the tacking operation is completed the spring 7 causes the hand lever 1 to return to the initial position while revolving around the axis pivot 2. While returning into the starting position, the bolt 8 of the hand lever 1 lifts the dr-iver 5 so that then the usual spring in the magazine will cause the staple strip in the magazine to slide forwardly until the next staple is in the guideway.

At the beginning of the operation, this combined lever arrangement interposed between the hand lever 1 and the driver 5 will oause the force exerted upon the hand lever, by the hand of the operator, to be transmitted to the driver 5 with small length of path and high pressure. As soon as the driver has separated the staple from the staple strip, the combined lever arrangement is no longer active and the force exerted by the hand of the operator is transmitted directly to the driver which drives the staple.

The device for the multiplication of power consisting in the combined lever arrangement produces the high separating pressure by static means.

In the embodiment shown in FIGURES 3, 3a and 4, the hand lever 1 is provided, on its bottom side, with a finger plate 18 revolvable around a pivot 19 mounted in the hand lever 1. At the front end of the finger plate 18 is fixed a pin 20 firmly engaging the driver 5. A pin 21 fixed to the upper forward part of the, hand lever 1 is adjacent, in the starting position shown in FIG. 3, to the end 17 of the implement body. The distance between the pivot 19 andthe middle of the linger plate 18 is a multiple of the distance between said pivot -19 and the driver 5, an arrangement resulting in a transmission ratio of about 1:5. The pin 21 extends through the slot 9 provided in the driver 5.

When applying the fastener, the hand of the operator holds the hand lever 1 while the fingers are resting on the nger plate 18. When starting the operation, the finger plate is pressed upwardly causing it to pivot counterclockwise around the axis 19. At that time the pin 21 is pressed against the edge 17. This causes the pin 20* to push down the driver 5 with a force corresponding to the transmission ratio of the

lever arms

19, 18 and 19, 17, i.e. with a multiple of the pressure exerted by the hand of the operator, so that the driver 5 separates, under high pressure, the staple in the guideway from the staples strip in the magazine. This is illustrated in FIG. 3a. When the hand lever 1 is then pushed down further the staple is driven into base with the simple, non-multiplied pressure exerted upon the hand lever. ln this case, too, the finger plate 18 acting as an intermediate lever will cause the pressure of the fingers to be transmitted, during the separating operation, in multiple ratio to the driver 5 as a result of the leverage whereas, after completion of the separating operation, the force exerted to drive the fastener into the base will be the simple, non-multiplied force of the operators hand.

Dur-ing the entire fastening operation, the movement of the fingers pressing the finger plate '1'8 against the hand Ilever 1 will automatically change over into the subsequent movement `of the hand palm pushing down the hand lever 1 so that the operation will only require the operator to press his fingers together after gripping the hand lever 1, then to push down immediately said lever so as to drive in the staple separated from the strip by his previous action of pressing his fingers together.

While, in the embodiments described above, the separating pressure was produced by static means, the ernbodiments shown in FIGURES 5 and 6 provide for the separation of the staples by dynamic means.

In the embodiment sho'wn in FIGS. 5 and 5a, the handle of thev implement comprises a jacket 31, provided with a coating 33 of rubber, plastic, or similar material, closed at its upper end by a screw cap 32. A weight block 35 subjected to the pressure of a Oil Spring 34 and serving las an inertia mass, is located in the jacket 31. The weight block 35 has an upper collar 36 supported by a ring-shaped shoulder 37 of the jacket 31. The jacket 31 encloses a slidable blocking sleeve 38 and a socket 39 which is fixed to the lower end of the jacket. The blocking sleeve 38 is supported by a spring 38a. The jacket 31 of the handle together with the blocking sleeve 38 and the socket 39, is slidably mounted on a tube 40 rigidly connected with the magazine 41. The upper end of the tube 40 is provided with several holes 42 uniformly distributed over its circumference and provided with balls 43. The weight block 35 has an annular groove 44 having a semicircular cross section. In the rest position shown in FIG. 5, the balls `43 engage the annular groove 44 thus locking the weight block 35 to the tubing 40.

The weight block 35 is provided with :a central bore 45 slidably receiving a bol-t 46, the lower end of which is formed as a cylindrical shoulder 47 and fixed to the driver 48. The shoulder 47 is supported by a return spring 49 provided in the lower part of the tube 40 land dimensioned substantially weaker than the top coiled spring 34 engaging the weight block 35. The driver 48 is guided in the guideway 50 of the magazine 41 containing the fasteners which are joined into strips, said fasteners consisting, yfor example, of U-shaped wire staples 51 shown in the drawing. The staples 51 are pressed in the usual manner into the guideway 50 `by means of a staple pusher engaged by a tension spring 52.

In order to drive in a fastener, the handle 31 is pushed steadily downwards. This will cause the spring 34 to be compressed since the weight block 35 is locked in its initial position by the balls 43 engaging the annular groove 44. It is only when the handle is pushed down far enough to cause the projection 53 Iof the jacket 3-1 to reach the level of the balls `43 that the latter are forced out of the annular groove 44, due to the tension of the spring 34 acting on the weight block 35. This will release the weight block 35, permitting it to move downwardly and causing the potential energy storedfin the spring 34 by the `downward movement of the handle, to 'be transmit-ted fas kinetic energy to the Weight block 35. When the weight block 35 hits the shoulder 47 of the fbolt 46, this energy is released so that the driver 48 subjected only to the action of the weak return spring 49 will transmit the stroke to the staple 51 in the guideway 50, thus separating it lfrom the staple strip in the lmagazine 41.

When the handle -is moved down beyond this release point, the force exerted by the hand of the operator is transmitted directly to the driver 48 by means of the bolt 46the upper end of which is adjacent to the bottom 0f the screwed cap 32. This Iwill cause the separated staple 51 in the guideway 50 to be `driven into the base, the driving-in pressure exerted directly by the hand of the operator being considerably less than the separating pressure produced by the kinetic energy of the weight block 35.

When the entire operation is completed the handle will be returned to the initial position by Ithe return spring 49 land the bolt 46. While returning, the Ahandle will draw the weight block 35 after it, since the shoulder 37 of the handle jacket 31 will engage the collar 36 of the weight block 35.

While the handle is returning into its initial position, the blocking sleeve 38 sliding in the jacket 31 is blocked by the balls 43 until the annular groove 44 of the weight block 35 reaches a position permitting the balls 43 to engage the annular groove 44. While the balls 43 are blocking the sleeve 38, its spring is compressed and, as soon -as the balls 43 release the sleeve 38, the spring will cause the `sleeve to be impelled upwardly until it reaches the shoulder 53, thus returning the implement to its initial position.

`In order .to allow for a direct transmis-sion from the handle to the driver during the driving process, the implement may be constructed according to the embodiment shown in FIG. 6. This embodiment providing for the continuation of the movement, atte-r 'complet-ion of the separating operation, by means of Ia mechanical :coupling of the handles with the weight block 35. For this purpose, the jacket 31 of the handle is provided With a pawl 61 mounted on said handle, the pawl being engaged by -a retaining spring 62. ln the rest position shown in the drawing, the pawl 61 is disengaged, by means of a suitlably shaped end 63 yof a yslotted recess 64 in the tube 40, rfrom a notch 65 provided in the Weight lblock 35. When the handle is manipulated, the pawl 61 may engage the recess 64 Without, however, engaging the notch 65 of the weight block 35. As soon as the weight block 35 is released during the operation by the

locking mechanism

43, 44, the pawl 61 will engage the notch 65 of the weight block 35, thus transmitting the movement of the handle independently from the spring 34 to the weight block 35 and the driver `48 adjacent to the weight block.

It is apparent that the above -described devices attain the several objects of this invention and are well adapted to meet the conditions of practical use.

Since the present invention includes various possible embodiments .and since various changes may be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative `and not in a limiting sense.

I claim:

l. A `stapling machine, comprising in combination with a manually movable handle and a staple driver movable from `a rest position to a vstaple separating position and thence to 'a staple inserting position; means operatively connecting said handle with said staple driver and transmitting pressure from said Ihandle to said staple driver for moving said staple driver when said handle is moved, and comprising means yautomatically exerting additional pressure upon said staple driver during movement of said handle to move said staple driver from said rest position to said staple separating position.

2. A stapling machine, comprising in combination with a frame, a manually actuatable handle swingably mounted in said frame and a staple driver movable from a rest position to a staple separating position; and thence to a staple inserting'position; means operatively connecting said Ihandle with said staple driver and transmitting pressure from said handle to said staple driver for moving said staple driver when said handle is moved, and comprising means automatically exerting additional pressure upon said staple driver during movement o-f said handle to move said staple driver from said rest position to said staple separating position. l

3. A stapling machine, comprising in combination with a frame, a manually actuatable handle swingably mounted in the frame, a staple driver movable from a rest position to a staple separating position and thence to a staple inserting position, and a guide for said staple driver; Ia pin connected with said staple driver, means connecting said pin with said handle, an intermediate lever extending through a slot formed in -said guide, and a pivot carried by said handle and carrying said intermediate lever, the distance between said pivot and said staple driver being substantially smaller than the distance between said pivot and an opposite end of said intermediate lever, whereby additional pressure is exerted upon said means, said pin and said staple ydriver when said staple driver is moved from said rest position to said staple separating position.

4. A stapling machine, comprising in combination with a frame, a manually yactuatable handle swingably mounted in the frame, a staple driver movable from a rest position to a staple separating position and thence to a staple inserting position, and a guide for said staple driver; a pin connected with said staple driver, means connecting said pin with said handle, an intermediate lever extending -through a slot formed in said guide, a pivot carried by said handle landcarrying said intermediate lever, and a roller carried by the inner end of said intermediate lever and engaging an inner surface of said handle, the `distance between `said pivot Iand said staple driver being substantial-1y smaller than the distance between -said pivot and the inner end of said intermediate lever, whereby additional pressure is exerted upon said means, said pin and said staple driver to move said staple driver from said rest position to said staple separating position.

5. A stapling machine, comprising in combination with a fname, a manually `actuatable handle swingably mounted in the frame, a staple driver movable Ifrom :a rest position to a staple separating position and thence to a staple inserting position, and a guide for said staple driver; la pin connected with said staple driver, a linger actuated plate carrying said pin, a pivot carried by said handle and carrying said finger plate, Iand `another pin carried by said handle land extending through a slot formed in said guide, said other pin engaging said slot and exerting counter pressure on the iirst-mentioned pin when said finger plate is actuated.

6. A stapling machine in accordance with claim 5, wherein the distance between the middle of the linger plate and the pivot is ygreater than the distance between the pivot and the staple driver.

References Cited in the file of this patent l UNITED STATES PATENTS 2,545,397 Wampler Mar. 13, 1951 2,799,859 Spencer July 23,'1957 FOREIGN PATENTS 676,184 Great Britain July 23, 1952

Claims

1. A STAPLING MACHINE, COMPRISING IN COMBINATION WITH A MANUALLY MOVABLE HANDLE AND A STAPLE DRIVER MOVABLE FROM A REST POSITION TO A STAPLE SEPARATING POSITION AND THENCE TO A STAPLE INSERTING POSTION; MEANS OPERATIVELY CONNECTING SAID HANDLE WITH SAID STAPLE DRIVER AND TRANSMITTING PRESSURE FROM SAID HANDLE TO SAID STAPLE DRIVER FOR MOVING SAID STAPLE DRIVER WHEN SAID HANDLE IS MOVED, AND COMPRISING MEANS AUTOMATICALLY EXERTING ADDITIONAL PRESSURE UPON SAID STAPLE DRIVER DURING MOVEMENT OF SAID HANDLE TO MOVE SAID STAPLE DRIVER FROM SAID REST POSITION TO SAID STAPLE SEPARATING POSITION.