Патент USA US2133187код для вставки
ocg. 11, 193s. y c. w. CHENEY KEY FOR LOCKS v Filed Sept. 8, 1957 > 2,133,187 Patented Oct. 11, 1938 v2,133,187 UNITED STATES PATENT OFFICE 2,133l187 KEY Foa-_Looks _ , ' `- ` ' v Charles William Cheney, Soho, Birmingham, y. England Application september s, 1937, serial No. 162,847 aIn Great _Britain August 13, 1936 The invention relates to a lock key of thefflat Shank type having a. ñngel‘fplece at one end and formed from a sheet metal blank by folding the blank longitudinally upon itself from its middle fà into integrally joined halves and securing the halves together, one or both of the longitudinal edges of the shank being provide-d with ward engaging notches or such like. The invention provides an improved key con 10 struction of this type, and has for its objects, greater accuracy in formation, and increased strength and durability at that part of the key where these requirements are of importance, i. e. at the shank and particularly at its end, while 15 further, a much neater appearance results. I accomplish these objects by folding the key from a blank having two halves each comprising a ñnger piece portion and a shank portion, the two shank portions of the blank being disposed 20 on a common longitudinal axis and joined in tegrally at their free ends. In order to- secure the two halves together, the linger piece por tions of the two halves folded upon one another are rigidly connected, preferably by riveting. 25 One form of the invention provides a pin pro jection on the forward end of the shank while another form of the invention provides a longi tudinal tubular or pipe portion from the forward end, being minus the pin projection. The-first 30 form is carried out by including as part of the shaped blank a central and longitudinal web of a less width than the shank portions. The second form is carried out by providing a longitudinal central ?luting on each shank por 35 tion, and by slitting said flutings at the point where the blank is folded, so that on folding the ilutings form the pipe or tubular portion. The iluting may also be provided on each side the web in the ñrst form of the invention, as it 40 materially strengthens the shank.H The invention in its two forms is rep-resented by the accompanying drawing, Figs. 1-4 illus trating the first form, and Figs. 5-10 the second form. , 45 Fig. 1 is a side View of a ñnished key. Fig. 2 is a section of Fig. 1 on the dotted lines A. B. Fig. 3 is a side view of the shaped blank be-' fore it is folded and notched. 50 Fig. 4 is a longitudinal section of Fig. 3 upon the dotted lines C. D. - ' gFig, 8 is an ,innerside View of the shaped blank before it „is folded and notched. v _. - Fig. 9 is a longitudinal section of Fig. 8 on the dotted lines G. H. Fig. 10 is a, longitudinal section of Fig. 8 on 5 ' the dotted lines I. J. Where permissible the same letters of refer ence are used for corresponding parts of the drawing. , With reference to Figs. 1-4, a shaped but un- l0 notched blank comprises similar halves to be closely folded upon each other about the ap proximate centre line indicated at a, each half comprising a shank portion a2, and a finger piece portion a3 integrally joined by the web 15 a4, which is much less in width than the width of the shank portion. The web a4 is so shaped as to form the hollow projecting pin a5 when the halves of the blank are closely folded and se cured to each other. Longitudinally in line with 20 the web a4 and of about the same breadth, each shank portion a2 is formed with a fluting a6 which materially strengthens the shank, these flutings coming close together when the blank is closely folded to form a substantial cylin- 25 drical portion as clearly shown in Figs. 1 and 2. Each finger piece portion a3 is pierced at a1, and the edge of one of these piercings is drawn out to provide a small sleeve a8, as clearly shown in Figs, 3 and 4, to enter the other piercing and 30 be riveted over, as clearly represented in Fig. 2, for the purpose of rigidly securing the closely folded halves to each other, it being understood that the folding and closing of the halves is performed by press tools, as also is the securing. 35 The second form of the invention Figs. 5-10 is without the pin projection a4, and is of a construction known as a tubular or pipe key, _the fluted portions a6, a6 in the shaped blank being only separated by a slitting c which does not extend through the whole of the middle of the shank, as clearly represented by Figs. 8, 9 and l0. When this blank is folded the slitting pro vides an entrance to the tube or pipe d formed by the combined ñutings a6, a6. Otherwise this 45 second form of the invention is substantially the same as the ñrst form, both forms having the same distinctive feature, viz. that the shank por tions of the two halves are disposed in the blank on a common longitudinal axis and are joined 50 integrally at their ends. 'I‘he word-engaging notches may be provided Fig. 5 is a side view of a finished key. Fig. 6 is a section of Fig. 5 on the dotted lines ` at any convenient period in the manufacture of E. F. the key. . 55 Fig. 7 is an end view of Figs. 5 and 6. It will be understood that accuracy in forma- 55 2 2,133,187 _ tion of the shank and maintenance of that ac . latter, said web, after folding of the halves upon curacy is essential, particuarly at its end, and one another, forming a pin at the end of the key shank. it will be appreciated that the invention com pletely satisfies these requirements as the halves of the key are integrally joined up at said end, thereby rendering separation of the shank prac tically impossible. _ Havingr now described my' invention, what I claim and desire to secure by Letters Patent is: - 10 1. A lock key of the character described, formed from a single sheet metal blank having similar halves by folding the blank longitudinally upon itself and securing the halves together, each of said halves comprising a finger piece portion and a shank portion, the shank portions of the two halves being disposed in the blank on a common longitudinal axis and being joined integrally at their ends. ' 2. A lock key, as claimed in claim 1, in which said blank comprises further a longitudinally ex tendingweb of a width less than ~that of the shank portions and integral with both of the 3. A lock key,'as claimed in claim 1, in which said blank comprises further a longitudinally ex tending web of a width less than that of the shank portions and integral With both of the latter, said shank portions and web being longi tudinally fluted, whereby the fluted'tweb, after folding of the rhalves upon one another, forms a 10 tubular closed pin at the end of the key shank. 4. A lock key, as claimed in claim 1, in which the integral shank portions of both halves are longitudinally ñuted intermediate their outer edges and a transverse slit is provided between the two halves of the blank across the fluting inter mediate two strips of material integrally joining the two shank portions, whereby the key shank, after folding of the halves upon one another, comprises a tubular portion open at the free end 20 of the shank. CHARLES WILLIAM CHENEY.