Патент USA US2126391код для вставки
Aug. 9, 1938. ' E. N. JACOB] 2,126,391 LOCK Filed’ May 10, 1957 2 Sheets-sheaf: 1 Edward N. Jami” Aug. 9, 1938. _ E, N, JACQBI LOCK ‘ > 2,126,391 - ' Filed May 10, 1937 ‘ 2 Sheets-Sheet 2 63m? Edward N m ‘ 2,126,391 Patented Aug. 9, 1938 UNITED STATES PATENT OFFICE 2,126,391 LOCK Edward N. Jacobi, Milwaukee, Wis., assignor to Briggs & Stratton Corporation, Milwaukee, Wis., a corporation of Delaware Application May 10, 1937, Serial No. 141,713 4 Claims. (Cl. 70-417) This invention relates to improvements in locks parts thereof being broken away and in section; ' Figure 2 is a front end view of this look with a and refers particularly to pin tumbler locks. In certain types of pin tumbler locks, it is customary to assemble the cylinder with the cas~ 5 ing from the rear. As a result, the joint be tween the cylinder and its casing is exposed at the cylinder; the front end of the look so that it is possible to insert a thin feeler between the cylinder and the wall of the bore to hold a su?icient number of Figure 4 is a view similar to Figure 1, illustrat ing a slightly modi?ed embodiment of the inven tumblers in their inoperative positions (to which they have been actuated by a picking tool) to permit the lock to be forced. It is therefore an object of this invention to provide means for guarding the joint between the cylinder and the casing bore at its front end to preclude the insertion of a feeler. It is also customaryin locks of this type to pro vide ‘the desired ?nish for the front end of the look by directly plating the die-cast cylinder and easing. Plating the lock parts in this manner does not permit the best treatment of the die castings for corrosive resistance. t is therefore a further object of this inven tion to provide the desired bright ?nish for the front end of the look by means of separate caps covering both the front of the cylinder and the front of the casing so as to permit treating the zinc alloy die castings by the best process for cor rosive resistance. Another object of this invention is to so de 30 sign these caps which provide the desired bright ?nish for the front end of the look as to also tion; Figure 5 is a perspective view of the cylinder 10 cap and the front end of the cylinder of the lock shown in Figure 4; Figure 6 is a View similar to Figure 1, illustrat ing another modi?ed embodiment of the inven tion; 15 Figure 7 is a front View of the lock shown in Figure 6; and Figure 8 is a perspective View of the cylinder cap and the front end of the cylinder of the lock shown in Figure 6. Referring now particularly to the accompany ing drawings in which like numerals indicate like parts throughout the several views, the nu meral 5 designates the casing of a pin tumbler lock which is bored as at 6 to receive a lock cyl inder l. The lock is of the type wherein the cylinder is inserted into the bore 6 from its rear end and means (not shown) are provided for securing thecylinder in the casing. The cylinder is provided with the customary .1 pin tumblers 8 (only one being shown) yieldingly urged into the cylinder by spring pressed drivers protect the joint between the cylinder and the 9 mounted in the casing. The inner ends of the casing bore against the insertion of a thin feeler. tumblers 8 extend into a keyway I!) to be accessi ble to a key insertable into the keyway by which the tumblers are lifted to bring the junction of their outer ends and the drivers 9 in line with A further object of this invention is to provide simple and e?icient means for retaining the caps in position, which is so constructed that the caps may be readily applied after the cylinder and the joint between the cylinder and the casing easing are assembled. With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, bore. To protect the front end of the joint between .V combination and arrangement of parts substan tially as hereinafter described and more particu larly de?ned by the appended claims, it being un derstood that such changes in the precise em bodiment of the hereindisclosed invention may be made as come within the scope of the claims. it) portion thereof broken away; Figure 3 is a perspective view showing the inner face of the cylinder cap and the outer end of The accompanying drawings illustrate several complete examples of the physical embodiment of the invention constructed in accordance with the best modes so far devised for the practical appli cation of the principles thereof, and in which: Figure 1 is a side view of the front end portion of a lock embodying one form of this invention, the cylinder and the casing bore and preclude the possibility of inserting a feeler between these parts for the purpose of retaining the tumblers in inoperative positions after they have been picked, the front end of the cylinder is covered by a sheet metal cap II which has a ?ange 12 extending out over the joint. ‘To accommodate the flange, the front end of the bore 6 is counter bored as at 13. As best shown in Figure 3, the mouth of the . keyway it extends substantially entirely across the diameter of the cylinder and is of a size to receive an inward protrusion 14 formed on the cap 1 l. Theiprotrusion I4 is struck from the cap, as shown, and fits snugly within the mouth of the 55 2 2,126,891 keyway so as to secure the cap against relative rotation with respect to the cylinder and at all times maintain its key opening IS in proper align ment with the mouth of the keyway. Assembly of the cap H and the cylinder is ef fected by merely slipping the cap onto the front end of the cylinder. It is held in position against detachment by a ring-like cap l6 secured over the front end of the casing 5. The cap I6 has a 10 hole I‘! approximately the diameter of the bore 6 so that the ?ange l2 of the cylinder cap is con— ?ned beneath the inner peripheral edge portion of the cap IS. The cap [6 is shaped to conform to the con ?guration of the front end of the casing and is secured in place by having its outer peripheral portion l8 ?tted tightly about a rim I9 formed at the front end of the casing. The cap I6 is thus securely fastened to the casing and by ex tending over the ?ange [2 of the cylinder cap serves to hold the same in position. Inasmuch as it is desirable to have a bright polished ?nish for the front end of the cylinder, the caps H and 16 are suitably plated and pol ished prior to their application to the cylinder and casing. In this manner, the desired ?nish is obtained for the front end of the look without necessitating plating the die-cast parts, thus al lowing the most approved process to be em ment of the cap 4|. The casing cap 4| conforms to the non-circular cross sectional shape of the casing and is ?tted snugly thereover and se cured in position by having a portion of its rear edge engage down into a recess 42 in the casing, an as shown in Figure 6. From the foregoing description taken in con nection with the accompanying drawings, it will be readily apparent to those skilled in the art, that this invention provides. simple means for protecting pin tumbler locks of the character described against picking by the insertion of a thin feeler between the cylinder and. casing bore, and that the same means which is used to pro vide this protection also serves as a ?nish for the front end of the lock leaving the die-cast parts thereof free to be treated in the most desir able and approved manner for corrosion resistance. What I claim as my invention is: 1. In a lock: a bored casing having a counter bore; a cylinder mounted in the bore with one end projecting into the counterbore; a cap over lying said end of the cylinder with its peripheral portion extending therebeyond, said end of the cylinder being spaced from the bottom of the counterbore so that the peripheral portion of the cap is held from contact with the casing; coop erating means on the cylinder and the cap to ployed for protecting the die castings against corrosion. secure against relative rotation therebetween; 30 ‘ In the embodiment of the invention illustrated end. of the casing with its inner peripheral por tion pressing against the front of the cylinder cap to hold the same in ?rm engagement therewith and secure the cylinder against outward endwise movement. in Figures 4 and 5, the cylinder cap 20 consists of a dished plate to be ?tted over the front end of the cylinder and having a rectangular opening 2| for alignment with the mouth of the keyway 22. The cap is held against rotation on the cylinder by two rearwardly directed tangs 23 which engage in notches or recesses 24 in oppo site sides of the cylinder. As in the embodiment previously described, the front end of the casing bore is counterbored as at 25 to receive the outer edge portion of the cap 20 which is of larger diameter than the cylin der so as to cover the joint between the cylinder and the casing bore. The cylinder cap is re tained in position by a cap 26 which covers the front end of the cylinder to which it is securely fastened by having its peripheral portion 21 formed about an annular ?ange 28. At its center, the cap 26 has ahole provided with an inwardly directed ?ange 29 to engage the face of the cap 20 and hold the same in place. In the embodiment of the invention illustrated in Figures 6, '7 and 8, the lock casing 30 is non circular in cross section, but in other respects is like that shown in Figure 1 and is bored to re ceive a cylinder 3|, the front end of the bore being counterbored as at 32. In this instance, the cylinder cap 33 is substantially a shallow cup with a peripheral ?ange 34 extending rearwardly therefrom to engage over the front end portion of the cylinder. A transverse substantially rec tangular opening 35 in the face of the cap 33 ‘ provides a passage for the key in alignment with the mouth of the keyway 36, and rearwardly extending lugs or ears 3'! on the margins of the opening 35 engage in recessed portions 38 at the mouth of the keyway to secure the cap against rotation with respect to the cylinder. As best shown in Figure 6, the outer surface of the annular ?ange 34 is stepped to provide a ledge 39 which engages in back of the edge of a hole 40 in the casing cap 4|. In this manner, 75 the cylinder cap is retained in place upon secure and a ring-like cap secured over the adjacent 2. In a lock: a bored casing having a counter bore; a cylinder mounted in the bore with one end projecting into the counterbore; a cap over lying said end of the cylinder with its peripheral 40 portion extending therebeyond, said end of the cylinder being spaced from the bottom of the counterbore so that the peripheral portion of the cap is held from contact with the casing; coop crating means on the cylinder and the cap to secure against relative rotation therebetween; and a ring-like cap of thin spring-like stock se cured over the adjacent end of the casing with its inner peripheral portion pressing against the front of the cylinder cap to yieldingly hold the cylinder cap against the cylinder and urge the cylinder in one endwise direction. 3. In a look: a casing having a bore; a cylin der mounted therein and having diametrically opposite longitudinally extending grooves in its ,7; outer surface; a cap covering the front end of the cylinder with its peripheral portion extending out over the joint between the cylinder and the casing bore to prevent the insertion of a tool therebetween; cooperating means on the cylinder (3 O and cap for securing said cap against relative rotation includingr rearwardly directed diametri cally opposite tangs formed on the peripheral portion of the cylinder cap and closely ?tted into said diametrically opposite grooves in the outer surface of the cylinder; and a ring-like cap se cured over the front end of the casing with its inner peripheral portion overlapping the cylin der cap to hold the same in place. 4. In a lock: a casing having a bore; a cylinder mounted therein and having diametrically oppo site longitudinally extending grooves of different size in its outer cylindrical surface; a cap cover ing the front end of the cylinder with its periph eral portion extending out over the joint between 75 2,126,391 the cylinder and the casing bore to prevent the insertion of a tool therebetween; a nonrotatable connection between said cap and the cylinder comprising, a tang projecting rearwardly from the peripheral portion of said cap and of a size to be closely ?tted into the larger of said cylinder grooves, and another tang smaller than said ?rst named tang projecting rearwardly from the pe 3 ripheral portion of said cap at a point diametri cally opposite said ?rst named tang and adapted to be closely ?tted into the smaller of said cylin der grooves; and a ring-like cap secured over the front end of the casing with its inner peripheral portion overlapping the cylinder cap to hold the same in place. EDWARD N. JACOBI.