US 2294463 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Sept. 1, 1942. E KRANTZ l 2,294,463.
FASTENER DRIVING TOOL Filed sept. 15, 19:59 2 sheets-sheet 1 A TTORNEYS.
562% L E942 E. KRANTZ 2949463 FAS TENER DRIVING TOOL Filed Sept. l5, 1939 2 Sheets-Sheet 2 L59 vJO v 7 ATTORNEYS.
INVENTOg Edu/Ud ffm/j,
rinsed sept. 1,.-1542" 2,294,453
UNITED STATES PATENT-OFFICE Y,
Edward Krantz, Chicago, Ill.;l Helen Krantz, ad-
ministratrix of saidEdward Krantz, deceased;Y f assignor of one-half to Valentine Pearson and I one-half to Henry A. Torstenson, both of Chicago, lll.
Application september 15, 1939, serial No. 294,992 1 Claim. (ci. 14s) One of the objects of this invention is to pro- The tacker is characterized by a hollow sheet vide a fastenerdriving tool in which the driving metal casing Il i which comprises a vertically exhammer is retracted and released by a new and tending head portion II and a rearwardly extend-r improved trigger mechanism which insures deing hand grip portion I2. The head portion II pendable performance. 5 is connected at its lower end to a rearwardly ex- Another object is to provide a fastener drivin tending feed bar I3 which is separated from the tool in which the fastener while being driven is hand grip portion I2 far enough to leave room guided in its movement by a new and improved for the iingers of the operator in grasping the supporting device which keeps the fastener from portion I2. dropping and insures the same being driven The means for driving the tacks is housed v straight. within the head portion II of the casing and in- Another object is to provide an improved fascludes a block-like hammer I4 which is vertitener, in the form of a specially designed tack, cally slidable'in'a guidewayi (see Fig. 5) formed incorporated with a large number of similar tacks between the sides It of the yhead portion, the
, in a unified strip, for use in a tacker constructed 15 front wall I1 'of'y thefhead vportieri and retaining in accordance with the invention. strips i Il securedito tliesides I6. The hammer While the foregoing statements are indicative Il has a-drivin'gfblade'fls attached tothe lower in a general way of the nature of the invention, portion of the-.fron 'ce thereofgand 'thi lade other more specific objects and advantages will moves vertically".` hind'dt ha' be apparent to those skilled in the art upon a full 20 20 within a forwardly openiri y oo understanding of the improved tool, tack, and 6) in the front end of theffedbari t. tackY strip. v. U The feed barls. portion.
[A preferred embodiment of theinvention is a longitudinally exte `presented herein for the purpose of exemplifica. cross section, in which shaped tion-,but itwill of course be appreciated that the cially designed tacksf22 of o espondingyshape invention is susceptible of incorporation in other are held. These 't a c ks lpreferably have oval structurallymodied forms coming equally with-, yshanks 2|, with pointed tipsA 5. and laterally in the scope of the appended claim.
In the accompanying drawings:
Fig. 1 is a side view of a tacker constructed vin accordance with the invention;
Fig. 2 is a vertical longitudinal section through the tacker, taken on the line 2-2 of Fig. 3;
Fig. 3 is a bottom view of the tacker; Fig. 4 is a fragmentary-sectional view,y corresponding to a portiony of Fig. 2, showing the hammer just as it is starting to descend; .f f
Fig. `5 is a horizontal transverse section its other end through the head of the tacker, taken on the line piece is hoo Ld terrien 40 sz or1fsiiap Fig. 6 is afvertical transverse section, taken the groove 22 be ost'tack`in"the on the vline 6-5 of Fig. i; groove. The tacks are held down in the groove Fig.7 is a vertical transverse section through 22 inthe feed bar by angle strips 31 (see Fig. '1) the'tack strip bar, taken on theline 'I-1 of Fig.3; which are secured to the sides of the feed bar Fig. 8 is a front view of o ne of the specially de- 45 with their edges slightly lapping thetop of the signed tacks driven by the tool; groove 22. The finger piece 30 is provided with Fig. 9 is a side view of .one of the tacks; laterally and downwardly extending wings 24 Fig. l0 is aperspective view of a section of the which fit about the sides of the feed bar I3 in' u tack strip used with the tool; and l an out-of-the-Way position. When the feed bar Fig. 'l1 is a top view of a section ofthe strip. 5013 is being reloaded, the finger piece 30 is un- A The tool shown in the drawings is what is hooked from the stud 3| on the follower 32 and known as a tacker, which is used for driving temporarily hooked over a stud on the rear tacks,.but a number of the features embodied in end of the hand grip portion I2 of the casing, in this tacker are equally applicable to staplers and an out-of-the-way position.
other kinds of fastener driving tools. The spring strip 28 acts through the follower 32 to push the foremost tack 23 into a position directly beneath the lower edge of the raised driving blade I9, in readiness to be driven downwardly through the groove ZI every time that the blade is elevated into the position shown in Fig. 4.
The hammer I4, with the blade I9, is moved rapidly and forcibly downward by a large coil spring 36. The spring 36 fits within a socket 31 in the top of the hammer and is compressed between the bottom of the socket and the underside of a compression adjusting nut 38. The nut 33 is threaded onto a stud 39 in the top of thehead portion Il of the casing and has a knurled periphery which is exposed through openings 40 in the sides of the head portion to facilitate the making of adjustments in the amount of compression given the spring.
The hammer I4 is elevated into the striking position shown in Fig. 4 by a hand lever 4I which is pivoted at its front end to the casing on a pin 42 and extends rearwardly over the hand grip portion I2 in vertically spaced relation to the latter.A The hand lever. is provided at its front end with a forwardly projecting finger 43 which terminates in a small sharp upwardly pointed tooth 44. yThis tooth is adapted to engage with a small hook 45 on the upper end of a dog 46 which is carried by the hammer I4. The dog 46 is positioned in a vertically extending groove 41 in the back of the hammer I4 and is pivotally attached to the hammer by a pin 48. The upper end of the dog 46 above the hook 45 is beveled at 49 for forwardly camming engagement with a pin 50 in the-casing. When the hammer I4 is elevated into approximately the position shown in Fig. 4 by a downward movement of the hand lever 4I the upper beveled end of the dog 46 will cam against the pin 50 and be forced out of engagement with the tooth 44, thereby releasing the hammer from the hand lever and 'allowing the hammer to descend under the force exerted thereagainst by the then highly compressed spring 36. The Ahammer I4, with the driving bladev I9, is shown in its lowermost position in Fig..2, in which position the dog`46 will re-engage with the tooth 44, preferably under the action of a light spring I between the dog and the bottom of the groove 41, in readiness to be elevated again. The hand lever 4I is normally held in the raised position shown in Fig. 2 by a coil spring 52 which is compressed between the underside of a portion of the top of the casing and the upper side of the front end of the finger 43.
' When the foremost tack 23 is being driven by the blade I9 it is supported throughout a good part of its downward movement by the front end of a small bar 53 which is located in a groove 54 in the underside of the front end of the feed bar I3. This tack-supporting bar 53 is both pivotally and slidably supported near its rear end on a. pin 55, which pin passes through a longitudinally eldngated slot 56 in the bar. The'front end of the bar 53 is provided with a small vertically extending slot 51 (Fig. 3) which ls just large enough to accommodate the shank 24 of the tack to be driven. When the hammer I4 is in its elevated position, in readiness for the blade I9 to drivey the foremost tack, the bar 53 will be shifted forwardly by a spring 58 which engages with the rear end of the same, and will at the same time be raised into a position immediately beneath and forwardly of the front end of the tack-holding groove 22 in the feed bar I3. This upward movement of the front end of the bar 53 is 1 brought about by-a stationary cam 59 in the front portion of the groove 54 which engages with a cam surface 60 at one side of the notch formed in the bar 53. As the foremost tack descends with the blade I9 it will be supported effectively in its downward movement by the notched front end of the bar 53. Just before the tack reaches the surface into which itis to be driven the cam 59 will force the bar 53 rearwardly, causing the upper bifurcated surface of theA front end of the bar 53 to withdraw rearwardlyfrom its supporting engagement with the under'sides of the laterally projecting head pieces 26 of the tack, which up to that time the bar 53 had been supporting. Upon the blade I9 being raised again in preparation for the next tack-driving operation, the front end of the supportingbar 53 will be shifted forwardly and upwardly` by the spring 58 into a position where it will receive and support the next tack as the latter is driven.
A fastener driving tool comprising a feed bar having a groove therein for the reception of a plurality of fasteners, means above the front end of the groove in the feed bar for driving the foremost fastener, and means below the 'front end of the groove for supporting and guiding the foremost fastener during its downward movement, said last mentioned means consisting of a bar which engages at its front end with the fastener during the downward movement of the latter,
' and said bar being pivotally mounted to permit its front end to move downwardly with the fastener and slidably mounted'to permit its front end to move rearwardly into a position out of engagement with the fastener as the latter approaches the surface into which it is being driven, a spring for sliding the bar forwardly, andal cam in engagement with the bar at a point in front of the pivot for camming the bar rearwardly when the front end of the bar is forced downwardly by the fastener and for camming the front end of the bar-upwardly when the bar is moved forwardly by the spring.
. EDWARD' KRANTZ.