US2375419A - Magazine hammer - Google Patents

Description

. Patented May 8, 1945 .Edwardslfirantzyfihicaw, 111.; (Helen Krantz, lad- ,min-istratrix ofsaid Edward ,Krantz, deceased, .ass ignor -of one-half to Henry A. Torstenson ,andlone-half to valentine Pearson, both of Chicago,'1ll.

Application March'ili l, 1941, Seria'l No. 383,2 19

1s Claims. (01. 1-49) This invention has "to do 'with magazine hammers of thetypeused'for driving staples, tacks and other kindsoffastaners. The principal object of the invention is to provide an improved magazine hammer which is automatic in action,"operates'easily'and smoothly, affords ample driving 'force with a minimum amount of movementislight in weight, possesses a fine =balance,' is rugged in construction, and will give dependable service for an indefinitely long period oftime.

Another important object of the invention to provide a magazine hammer which holds amers ceptionally large number of staples, loads from the rear, is easily accessible for loading, and has a long hand grip portion which extends rearwardly about the loading means without interfering inany, way with-the. latter.

While the foregoing statements are indicative in a general way of the nature of the invention, other more-specificobje'c'ts" and "advantages will 'be apparent to those skilled in the art upon a full understanding of the construction, arrangement and operation of 'thepar'ts entering in'tojthe improved'h-ammer.

A preferred embodiment of the-invention is presented'hereinby way'of exemplifica'tion, but it will of course be appreciated that-thejinv'ention is susceptible of embodiment-mother structurally modified forms comingequallywithin -the scope of-the appended claims. In the accompanying drawing: I I Fig. 1 is a side view of a m'agazima hammer construction in accordance with the invention;

"Fig, '2 is -a plan View of the hammer, with a portionof the magazine oover 'broken away to expose thestaplebar and follower;

Fig. 3 is a vertical longitudinal.sectionlthrough the head of the hammer, taken on .the ,lineIS-Ii ofFigZ; e Fig. 4 is a similar section through the head, showing the position of the various :Dartsat the moment of impact; p

Fig. 5 is a vertical -.transver se.section through: the handle of the hammentakenon the line 5'-.5

of Fig.2; p

Fig. 6 is :a front viewof :the head-of =the.ham-- met; and

:Fig. 7 is a vertical transverse section through the head, taken on the line ;I-l --,of Fig. 4.-

The magazine .hammerlshown in the drawing includes a head to {and a handle ll Ix." Aetaple carrying bar l2- extends practically ithB cfulltl'ength of the hammer, on the inside of the same, from the'frontendof the head 10 to the rear end-of thehandle l'l "l'hebar -l 2 is provided in itsupper portion with a longitudinally extending staple guidewa-y l-3 of downwardly opening kl-shaped cross section-of the same shape 'as the staples ll used }in' the hammer. The staples areconnecte'd'togetherin a long-strip by adhesive material which-permits the foremostjstapleto 'bereadily separated from the others when the hammer-strikes. Thestaples 'M straddletthe bar I 2, between*inwardlyfiangedside plates 1 5 which form *por'tions o'f the bar, and are advanced forwardly along the 'bar by -"a corre spondingly shaped sheet metal follower l6.

The follower 1 6 slidesfreely in the guideway i 3, and is provided on its upper surface with a coupling button 'I '1. A finger piece -I 8, which is con nected to the free'end of a draw'spring' l9, 'is detachably coupled .With'the button I! on the m1:

. lower. The bar 12 can be loaded with -staples for practically its entire length, leaving room only for the follower l6 at the rear endofjtheguida way l3.

The head 10 0f the 'hammer includes 'two com- -plementarysheet 'metal casing member's'ifl "of generally triangular shape Whicharefiangedtow ard leach other along their front and rear edgesto 'form a hollow structure and are secured along their lower edges'to the sides'of the bar {l2 adjac ent the front end of the latter. The=head 10 contains-in addition to the usual torsion mounting 2| for the coiled portion of the spring 9 a vertically extending guidewayf22,-a driving block 23 inthe guideway, a striker 2'4; and-aoam 15. The

' driver 23 is 'urged upwardly in the 'guideway '22 by aspring26 beneath the same and is provided at 'its front edge with a downwardlyextending blade 21in line with a vertically extendingslot 2 8. Thes'lot 28--Which'isof*such size astoecportion of a U-shaped cap plate 29' which is.

short distance below the bottom of the imntend across the guideway 22 above the upper end of the driver 23. The cam 25 is provided on its under side with a curved surface 31 which cams downwardly-against the inclined upper surface 38 of the driver when the cam is rotated by the striker 24. The cam 25 is provided with a forwardly extending portion 39 whichis apertured to rotatably receive a pin 40 carried by'rearwardly extending side flanges 41 on the upper end of the striker 24.

When the hammer is swung downwardly into engagementwith the object into which a staple is to be driven, the striker 24 upon coming into contact with the surface of the object will come to rest, the front end of the hammerwillcontinue its downward movement into engagementwith such surface, and-the striker will rotate .thecam 25 through an arc of-about 6 0,,camming the driver23 downwardly and causing the blade 2lto drive the foremost staple into the object,- all as shown in Fig.4. As soon as the front endofthe hammer is lifted from the-surface.of-theobject, the parts willreturn to their normal positions, .as

shown in Fig. 3, and the next staple will be projected by. theaction of the spring l9 intoa position directly beneath the lower edge of the blade 2'|,in readiness for the next stapledrivingoperae. tion.

The head of the hammer is preferablypro vided at its top with a U-shaped reinforcingfstrap 42 which can be usedas the impact surface. of an ordinary hammer by merely inverting the ham}.

mer.

portions 43 which will afford anadditional intermediate anchorage for the member 44 which is.

being fastened down. To accommodate the downwardly looped portion 43 the staple .carry'inglbar l2 may be provided along its upper surface with,

'a correspondingly shaped groove45, 'asjshown in Fig. 5, and the lower edge of the driving blade 21 may be provided with a correspondingly shaped projection 46, as shown in Fig. '7, which projection willconforrn to the downwardly loopedportion 43 of the staple and will act tolprevent any mad vertent sidewise movement of thestaple while thelatter is being driven. V v The handle I l includes a longupwardly opening channel member 41 which is secured to j the bar l2 and extends from a'point just behind the head Ill to a point adjacent the rear end of the bar. The corners of the channel member. 4'! are rounded at 48 to provide a well shapedhancl grip.

Because of the length of the handle the latter can be gripped at anypoint' which the operator finds most convenient. The handle also includes a cover member 49 which complements the channel member 41 and normally closes off'the: opening along the top of the latter. The cover member 49 is pivoted at'its front end to the front "end of the channel member 4'! by a pin 53 which extends between thesides of the channel member. s The cover member 49 is held frictionallyin its closed position, but is separable from the channel member 41 in the sense that it can be swung upwardly without difficulty into 1 an out-of-the-way' position, as shown in dotted'li'nes in Fi 1; when the hammer is being reloaded with staples. The

The staples M are preferably, thoughnotnec essarily, provided with downwardly looped center channel member 41 may advantageously be made of a transparent composition which will permit the operator to observe at any time how many staples are left in the hammer, without having to lift up the cover member 49. I

If the hammer should become jammed for any reason, 'due to'a defective or improperly sized its associated striker 24, forwardly into an out-ofthe-way position.

It will be observed that in the preferred embodiment of 'the invention shown herein the cam itslowermost: position this lever arm is length- -ened., This results in an acceleration in the movement of the driver at the instant that the staple isbeing driven home,; and-insuresgthe staple being driven all of theway-into the object, even with a comparatively lighteswing of the hammer.- It will be Observedthatinthe-lower- 1 tendency of the hammer to bounce abruptly. awai from the surface of the object into i which the staple has been driven.

Iclaim: w r z 1 1. In a magazine hammer for driving staples or other fasteners, a' head, a vertically movable striker slidably connected with the head, a-ver-,-

tically movable driver'also'yslidably connected withthe head, and a cam connectedwith the striker in camming engagement with the driver for moving the latter downwardly to drive a staple I upon the cam being turned by the striker through but a portion of one revolution. r

2. In a magazine'hammer for driving staples or'other fasteners, ahead, a vertically movable striker slidably connected with the head, a ver- -tically movable driver also slidably connected with the head, and a cam pivotally mounted in I the head, said cam being pivotally connected with the striker in camming engagement with..thj driver for moving the latter downwardlyto drive a staple upon the cam being rocked about its pivot by the striker through but a portion of one revolution. r v

3. In a magazine hammer for driving staples or other fasteners, a head, a vertically movable striker, a vertically movable driver, anda pivotally mounted camconnected withthe striker in camming engagement with the driver for moving the latter downwardly to drive a staple, said cam in its normal position engaging the *driver through a short lever arm, whichlever arm in creases substantially in length 'as 'the driver moves downwardly, whereby to accelerate the rate of movement of the driver *as the latter approaches its lowermost-position.

4. In a magazine hammer for driving staples or other fasteners, a head, a vertically movable striker, a vertically movable driver, and'a' pivot ally mounted cam connected with the striker in camming engagement with the driver formoving the latter downwardly to drive a staple, said cam being moved by the striker through anangle of approximately 5. In a magazine hammer fordrivingstaples movable striker slidably associated with the cap plate, a vertically movable driver within the head, and a power transmitting connection between the striker and the driver within the head for transmitting the movement of the striker to the driver,

, said striker being movable into an out-of-theway position as a unit with the cap plate upon release of the latter.

7. In a magazine hammer, staple carrying bar extending substantially the entire length of the hammer, a head on the front end of the bar, and

a handle extending from the head to a point adjacent the rear end of the bar in encompassing relation to the latter, said handle bein provided with a part which is separable with respect to the remainder of the handle to to the bar. I

8. In a magazine hammer, a staple carrying bar extending substantially the entire length of the hammer, a head on the front end of the bar, and a handle extending from the head'to a point adjacent the rear end of the bar in encompassing relation to the latter, said handle comprising an upwardly opening channel member and a complementary cover member which is movable into an out-of-the-way position to afford ready access to the bar.

9. In a magazine hammer, a staple carrying bar extending substantially, the entire length of the hammer, a head on the front end of the bar, and a handle extending from the head to a point adjacent the rear end of the bar in encompassing relation to the latter, said handle comprising an upwardly opening channel member and a complementary cover member which is pivoted at its front end to the front end of the handle and may be swung forwardly and upwardly to afford ready access to the bar throughout substantially the entire length of the handle.

10. In a magazinehammer for driving staples or other fasteners, a head, a vertically movable striker slidably connected with the head, a vertically movable driver also slidable connected with the head, and a power transmitting connection between the striker and the driver for transmitting the movement of the striker to the driver, said striker comprising a vertically elongated sheet metal member which extends downwardly from a point adjacent the upper end of the front portion of the head and terminates at its lower end in an angularly disposed impact portion.

11. In a magazine hammer, a handle containafiord ready access ing a longitudinally extending guideway for holding a supply of the staples to be driven, a head on the front end of the handle, a cap releasably secured to the-front part of the head, said cap and head together forming a forwardly separable vertically extending guideway in communication with the front end of the first mentioned guideway for directing the foremost staple into the object into which it is to be driven, a vertically movable driver mounted in the head for driving the foremost staple downwardly through the second mentioned guideway, a vertically movable striker carried by the cap in front of the head, and a power transmitting connection between the striker and the driverfor transmitting the movement of the strikertothe driver, said striker upon release of the cap being removable with the latter as a unit into an unobstructive position in which the second mentioned guideway is opened up and exposed.

12. In a magazine hammer for driving staples or other fasteners, a head, a work striker movably associated with the head and provided with a vertically movable portion for impact with the work into which the stapleis to be driven, a staple driver also movably associated with the head and provided at its upper end with a substantially fiat top portion, a power transmitting member pivotally mounted in the head, said member being provided at one side of itspivotal mounting with an arm portion which is connected with the striker and at the opposite side of its mounting with another arm portion which projects over the top portion of the driver, and a spring housed undervertical compression within a recess in the under side of the driver between the latter and an underlying portion of the head for moving the driver upwardly into engagement with the overlying arm portion of the power transmitting member. i

13. In a magazine hammer for driving staples or otherfasteners, a head, awork striker movably associated with the head and provided with a vertically movable portion for impact with the work into which the staple is to be driven, a staple driver also movably associated with the head and provided at its upper end with a substantially fiat top portion, a power transmitting member pivotally mounted in the head, said memher being provided at one side of its pivotal mounting with an arm portion which is connected with the striker and at the opposite-side of its mounting with another armportion which projects over the top portion of the driver, and a spring housed under vertical compression within a recess in the underside of the driver between the latter and an underlying portion of the head for moving thedriver upwardly into engagement with the overlying arm portion of the power transmitting member, said power transmitting member being located with its pivotal mounting above the top portion of the driver in all vertical positions assumed by the latter.

EDWARD KRANTZ.

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