Патент USA US2133812код для вставки
Oct. 18,‘ 1938. A, G'ELLLJVIAN 2,133,812 CLAMP SCREW AND NUT FOR A TUCKING KNIFE Filed Feb. 4, 1957 . Fig.1. l9 I” Illilllllllllllll' “IIR l uml'nl l 114' r MUM NVENTOR 173mb)’: 66117711472, Y ATTORN EY Patented~ Oct. 18, 1938 2,133,312 UNITED STATES PATENT OFFICE ‘ 2,133,812 CLADIP SCREW AND' NUT FOR A TUCKING KNIFE Abraham Gellman, New York, N. Y. Application February 4, 1937, Serial No. 123,966 3 Claims. (Cl. 85—-5) This invention relates to new and useful im provements in a clamp screw and nut for holding the arms of a tucking knife in adjusted position. The invention has for an object the construc 0 tion of a knife as mentioned which is character ized by the fact that it has an arm adapted to be pivotally mounted and a blade with a straight edge over which the material to be tucked may be fold ed, and said blade being connected with the arm in [0 a novel and advantageous manner. More speci?cally, the invention contemplates jacent a hollowed area Me. ranged so that the material which is being tucked, is guided to a closev position to the operating needle of the sewing machine. The stem portion Mb, is formed with a slot I‘! Still further the invention proposes an arrange tional convenience is provided for adjusting the tucking knife. For further comprehension of the invention, 35 and of the objects and advantages thereof, refer ence will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth. In the accompanying drawing forming a ma terial part of this disclosure: Fig. 1 is a plan view of a sewing machine equipped with a tucking knife according to this invention. 35 Fig. 2 is a plan view of the tucking knife per se. Fig. 3 is an edge elevational view of Fig. 2. Fig. 4 is a bottom view of Fig. 2. Fig. 5 is a transverse sectional view taken on the line 5--5 of Fig. 2. L0 Fig. 6 is a view similar to Fig. 5 but illustrating a modi?cation of the invention. A The tucking knife, according to this invention, comprises an arm l0 adapted to be pivotally mounted at the point II on the table [2 of a Ea sewing machine l3. This arm is associated with a blade 14 having a straight edge Ma and also b tucking knife. The opposite edge of the blade I4 is formed with a projecting ?nger portion Md ad connecting the blade and arm with each other by ment by which the clamp screw is made of several sections and arranged so that the head portion 30 thereof may be released when desired to eliminate the necessity of opening the screw. Thus, addi These parts are ar through which the clamp screw passes. The groove It!a is formed by merely recessing a groove into the top face of the arm It). At the area where the groove is formed the arm II! has a widened portion I00. This widened portion is imprinted 0r inscribed in any other manner with a scale I8. A line [9 is formed upon the stem “lb and co operates with the scale to indicate the positions of the blade M. 25 The clamp screw l5 has a large and ?at head I5a. It has a screw portion 15b extending through the slot l1 and through an opening 20 in the arm II]. A nut 15¢ threadedly engages on the screw portion l5”. A friction washer I5d is interposed 30 between the nut I5° and the bottom face of the arm I0. _ ' - To adjust the blade 14 it is merely necessary to pivot it to an inoperative position as shown in Fig. 1 and then to turn the nut l5c to loosen the clamp 35 screw. The blade and arm may then be relatively adjustedas required. The nut I50 is then tight ened. In Fig. 6 a modi?cation of the invention has been disclosed which distinguishes from the prior form in the fact that the head of the clamp screw may be loosened to release the blade, in addition to the fact that the nut may be loosened for the same purpose. There is therefore a choice for loosening the parts. More speci?cally, according to this form of the having a stem portion Mb slidable in a groove H19“ in the arm H). A clamp screw I5 is associated invention, the clamp screw has a head portion with the stem and arm for holding these parts shank 21 engages. in relatively adjusted positions. The full line position of the tucking knife, shown in Fig. l, is the operative position in which cloth material, indicated by the dot and dash line it may be folded over the edge of the tucking knife and fed to the sewing machine. The dot V The arm ‘[0 is formed with an aperture lla through which the pivot element II passes to pivotally mount the arm upon a sewing machine OI table. The blade M has its outer extremity l4c bent downwards to engage the top face of the sewing machine table so that the goods which is being operated upon will merely slide over the the use of a groove and tongue arrangement and providing a single clamp screw which may be opened to loosen the blade and arm so that they may be adjusted, or which may be closed. 30 and dash lines indicate 2. moved position of the tucking knife in which it is inoperative. 25 formed with a recess 26 into which a headed A resilient washer 28 is in terposed between the base of the recess 26 and the head of the shank 21. Several pins 29 are mounted in the head 25 and extend into the recess 26 and engage against a shoulder 2‘!,1 of the headed shank 21. This shoulder is formed with cam cutouts 30 arranged so that in a certain posi 56 2,133,812 tion of the head 25 the pins 29 are aligned with the cutouts and then the head 25 is loose, and in another position the pins 29 straddle the cutouts 30 and engage beneath the shoulder 2'!11 and then the head 25 is tight. The shank 21 passes through the slot I‘! in the stem Mb. It also passes through the opening 20 in the arm I0 and threadedly en against a shoulder formed by the bottom face of the head on said headed shank, said shoulder having cam cutouts formed radially therein and into which said pins may engage for releasing said head portion, and a resilient element inter posed between the base of said recess and the head of the shank. gages the nut l5°. There is also a friction washer 151 between the nut and the arm. The top face 2. In a device of the class described a clamp screw and nut for holding the arms of a tucking 10 of the nut 25 is formed with a hollow portion 258L adapted to receive a thumb. As shown in Fig. 6 the parts are clamped to gether. When required the head 25 may be slightly forced downwards against the action of the resilient element 26 and then the head 25 turned to align the pins 29 with the cutouts 30. The blade 14 and arm ID are then loose and may be adjusted. They may be re-tightened by turn ing the head 25 to cause the pins 29 to ride be 20 neath the shoulder 21a. The blade and arm may also be loosened by operating the nut I5°. While I have illustrated and described the pre ferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modi?cations coming within the scope of the invention as de ?ned in the appended claims. Having thus described my invention, What I claim as new, and desire to secure by United States Letters Patent is:—- r 1. In a device of the class described a clamp screw and nut for holding the arms of .a tucking knife in adjusted positions, comprising a headed shank portion and a head portion, the head of the shank portion engaging into a recess in said head portion, pins on the head portion engaging knife in adjusted positions, comprising a headed 1O shank portion and a head portion, the head of the shank portion engaging into a recess in said head portion, pins on the head portion engaging against a shoulder formed by the bottom face of the head on said headed shank, said shoulder 15 having cam cutouts formed radially therein and into which said pins may engage for releasing said head portion, and a resilient element inter posed between the base of said recess and the head of the shank, the outer face of the head por tion being recessed. 3. In a device of the class described a clamp screw and nut for holding the arms of a tucking knife in adjusted positions, comprising a headed shank portion and a head portion, the head of the shank portion engaging into a recess in said head portion, pins on the head portion engaging against a shoulder formed by the bottom face of the head on said headed shank, said shoulder having cam cutouts formed radially therein and 30 into which said pins may engage for releasing said head portion, and a resilient element inter posed between the base of said recess and the head of the shank, said resilient element com prising a rubber disc. ABRAHAM GELLMAN.