US2837908A

US2837908A - Cylinder lock

Info

Publication number: US2837908A
Application number: US445571A
Authority: US
Inventors: Segal Samuel
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-07-26
Filing date: 1954-07-26
Publication date: 1958-06-10
Anticipated expiration: 1975-06-10

Description

June 10, 1958 s, E L 2,837,908

CYLINDER LOCK Filed July 26. 1954 2 Sheets-Sheet 1 June 10, 1958 s, SEGAL 2,837,908

' CYLINDER LOCK Filed July 1954 2 Sheets-Sheet 2 v plug.

United States atent CYLINDER LOCK Samuel Segal, New York, N. Y.

Application July 26, 1954, Serial No. 445,571

Claims. (Cl. 70 367) This invention relates to a cylinder lock, and particularly to means for facilitating the assembly and disassembly of such locks.

The present invention is advantageous in connection with the original assembly of the component parts at the factory and also in connection with subsequent operations by locksmiths when they are required to disassemble and reassemble the locks. Although the drawing illustrates rim locks it will be understood that the invention may be used with mortise locks as Well.

It is an object of this invention to provide inexpensive means for simplifying the assembly anddisassembly of cylinder locks.

A further object is to provide means that may be applied easily to securely maintain the plug within the cylinder and the tumblers within the plug.

Other objects and advantages will become apparent upon reading the following specification, taken 'in conjunction with the accompanying drawings showing two preferred illustrative embodiments of the invention, in which:

Fig. l is a rear end elevational view of a cylinder lock embodying the invention;

Fig. 2 is a side elevational view showing the plug in dotted lines;

Fig. 3 is a rear end elevational view of the lock with the .guard plate partially removed from'the plug;

Fig. 4 is a fragmentary cross sectional view, taken along the line 4-4 of Fig. 1;

Fig. 5 is a-perspective view of a lock cylinder constructed in accordance with the invention; A

Fig. 6 is a detail perspective view of a lock plugadapted to fit in the cylinder of Fig. 5;

Fig. 7 is a detail perspective view of an angular retaining plate for holding the tumblers in the lock;

Fig. 8 is a detail perspective view of the guard for preventing accidental separation of the lock parts;

Fig. 9 is a rear perspective view of another embodiment having a different guard member;

Fig. 10 is a fragmentary rear perspective view of the lock of Fig. 9 with the sliding guard bar removed;

Fig. 11 is a fragmentary rear perspective view of the lock with the guard removed therefrom;

Fig. 12 is a fragmentary rear perspective view of the lock with the angular retaining plate removed;

Fig. 13 is a detail perspective view of the angular retaining plate for holding the tumblers in the lock;

Fig. 14 is a detail perspective view of the guard for preventing accidental separation of the lock parts;

Fig. 15 is a detail perspective view of the guard bar for preventing rotation of the guard relative to the plug;

Fig. 16 is a fragmentary plan view of the guard Fig. 17 is a rear end elevational view of the plug; and

Fig. 18 is a'fragmentary side elevational view of the Referring to Figs. 1 to 8 of the drawings, the reference numeral 2 indicates the lock cylinder having a rim 3 at its front end and provided with an axial bore 4 adapted to receive a plug 5. The cylinder is alsoprovided with a longitudinal recess 6 extending inwardly from its peripheral surface and with a plurality of closely spaced bores 7 extending from the bottom of. rescess 6 to the axial bore 4. One longitudinal edge 8 of the recess is perpendicular to the bottom of the recess and the other longitudinal edge 9 is undercut to provide an angular wall. A rim 10 integral with the rear face 11 of the cylinder projects rearwardly' from the face 11 and extends around a major portion of the circumference of bore 4. The ends 12 and 13v of rim 10 define a gap of substantially the same width as the width of recess 6 and are aligned transversely with the longitudinal edges of recess 6.

The plug 5 is slidable within bore 4 and is provided with a plurality of transverse bores 14 of the same diameter as the bores 7 of cylinder 2. The bores 14 extend from the peripheral surface of the plug to the upperedge of a keyway 15, as viewed in Fig. 6, and are arranged to register with bores 7 when the keyway 15 is in the position shown in Figs. 1 and 3. When the bores 7 and 14- are aligned a tumbler, driver, and spring (not shown) are inserted into each bore and an angular retaining plate 16 is positioned in the recess 6 to hold the tumblers, drivers and springs in place. The plate 16 may be slid longitudinally into the recess until the end piece 17 abuts the rear face 11 of the cylinder. The end 17 will then engage the

ends

12 and 13 of rim 10. The retaining plate may be positioned by inserting one edge in the undercut 9 and then pivoting the retaining plate about undercut 9 as a fulcrum until the opposite longitudinal edge of the retaining plate abuts edge 8 of the recess. This' pivotal movement of .the retaining plate is possible only when the end 17 is spaced outwardly from surface 11 sufficiently to clear rim 10. When the edges of the retaining plateengage the edges of the recess'the retaining plate is pushed longitudinally until the end 17 engages the gap between the ends of the rim 10. The outer edge of end 17 is curved concavely, as indicated at 18, to conform to the circumferential curvature of bore flwhich it abuts.

The rear end of plug 5 is cut away to provide a boss 19 which projects beyond the outer edge of rim 10when the plug is positioned in the cylinder 2. The surface 20 of plug 5 is flush with the outer edge of rim 10. The opposite edges of boss 19 are undercut to form grooves 21 for a purpose hereinafter disclosed. The upper end of boss 19 between the grooves 21 abuts the concavely curved surface 18 of the end 17 of the angular retaining plate 16. When the plug 5 is rotated by turning a key in the keyway 15, as in the normal use of the lock, it has a tendency to rotate the end 17 to displace the retaining plate angularly from its proper position. The engagement of the

ends

12 and 13 of rim 10 with the opposite edges of the end 17 prevents such rotation. The plug 5 is provided with a spring pressed pin 22 projecting outwardly from the surface 20. The pin '22 has an enlarged head 23 seated in a recess 24 with a spring 25 bearing against the bottom of the recess and the head 23 of the pin. The upper edge of the recess may be peened inwardly, as indicated at 26, or reduced in size by a suitable insert, to keep the pin from falling out of the recess.

The front end of bore 4 is counteroored, as indicated at 27, and the front end of plug 5 is enlarged, as indicated at 28, to fit in the counterbore and limit the longitudinal movement of the plug inwardly of the cylinderl When the plug 5 is positioned in the axial bore of cylinder 2 as far 'as it can go, with the enlargement'Zfi in counterbore 27,'the plug is held against longitudinal movement in the opposite direction by a guard 29. One end of the guard has a recess 30 providing two

fingers

31 and 32. The width of recess 30 is equal to the thickness of the undercut portion of boss 19 so that the inner edges of

fingers

31 and 32 fit within the grooves 21. When the guard 29 is slid into position the spring pressed finger 22 is depressed so that finger 31 can slide over it. The finger 31 is provided with an aperture 33 into which the finger 22 snaps when aligned therewith. The interengagement of finger 22 and aperture 33 prevents accidental displacement. of the guard. In order to remove the guard it is necessary to depress the pin 22 and slide the guard off the boss 19.

The guard is long enough so that it overlies the end 17 of retaining member 16 to prevent displacement of the retaining member.

The lock is assembled by sliding plug 5 into bore 4. Thetumblers, drivers, and springs are then inserted into

bores

7 and 14. The retaining plate 16 is then positioned in recess 6, and the guard 29 is slid on boss 19 until pin 22 engages aperture 33. The disassembly is just as simple since the steps are merely reversed.

In the embodiment of Figs. 9 to 18 cylinder 2 and the angular retaining plate 16 are the same as in the embodiment previously described, and the description of the parts will not be repeated. The same reference numerals are used to indicate the same parts.

The rear end of plug 5' extends beyond the surface 11 of cylinder 2 and is provided with a circumferential groove 34 having its inner edge surface flush with the, outer surface of rim 10. A transverse recess 35 across the center portion of the rear end of plug 5 extends inwardly from the rear end of the plug and its bottom is flush with the outer edge surface of circumferential recess 34.

A guard 36 is provided at one end with an opening 37 of substantially the same circumference as the projecting end of plug 5. The guard has a shank 38 extending laterally outward from one edge of the annular portion surrounding the opening 37. The shank is provided with a longitudinal recess 39 of substantially the same width as recess 35. Both edges of recess 39 are undercut, as indicated at 40, for a purpose hereinafter disclosed. The annular portion of guard 36 is provided with a pair of ears 41 extending into diametrically opposite edges of the opening 37. The cars 41 are aligned generally with recess 39, but their inner edges 42 are curved to conform to the curvature of the peripheral surface of groove 34 in which they fit.

The guard 36 is positioned on the rear end of plug 5' by holding it at right angles to the slot 35 and moving it inwardly with the cars 41 fitting intoopposite ends of recess 35. Rotation of guard 36 through 90 locks ears 41 in groove 34 and aligns recesses 35' and 39. A guard bar 43 is then slid into

recesses

39 and 35 to prevent relative rotation between the guard 36 and plug 5. bar 43 is split longitudinally adjacent one end, as indicated at 44, to provide some resilience, and the edges opposite the slit end are extended outwardly at an angle, as indicated at 45, to fit in the undercut portions 40 of recess 39 so that the guide bar will fit snugly enough so that it will not be accidentally displaced from the guard 36. As in the previous embodiment, the shank 38 of the guard overlies the end 17 of the angular retaining plate so that all the lock parts are held securely.

While I have described two preferred embodiments of my invention in detail, it will be understood that the de scription thereof is illustrative, rather than restrictive, as many details may be modified or changed without departing from the spirit or scope of my invention. Accordingly, I do not desire to be restricted to the exact construction described, except as limited by the appended claims.

I claim:

1. A lock comprising a cylinder having an axial bore for reception of a rotatable plug and means on the front surface of said cylinder for limiting the inward movement The guard of said plug, a rotatable plug positioned in said bore with an end portion projecting beyond the rear surface of said cylinder, the projecting end of said plug being provided with a groove having an inner edge flush with the rear surface of said cylinder, said cylinder and said plug having aligned transverse bores to receive lock tumblers, a re taining plate engaging said cylinder to retain tumblers in said transversebores, said retaining plate having an angular end piece engaging the rear surface of said cylinder, said plug having a tendency to rotate the angular end piece and to thereby displace said retaining plate angularly when said plug is rotated in the normal operation of said lock, projections on the rear surface of said cylinder engaging opposite edges of said angular end piece to prevent rotation thereof, and a guard engaging with said groove and overlying the angular end piece of said retaining plate to retain said plug and said retaining plate against separation from said cylinder.

2. A lock comprising a cylinder having an axial bore for reception of a rotatable plug, the front end of said axial bore having a counterbore to limit the inward movement of said plug, a rim projecting from the rear surface of said cylinder and substantially surrounding the rear end of said bore, said rim being provided with a gap, a rotatable plug inserted into said bore from the front end thereof, said cylinder and plug having a plurality of aligned transverse bores adapted to receive tumblers therein, said cylinder having a longitudinal recess adjacent corresponding ends of said bores, one longitudinal edge of said recess being undercut, an angular retaining plate positioned in said longitudinal recess to cover one end of each of said transverse bores, one edge of said retaining plate engaging said undercut, said retaining plate having one end extending into said gap in said rim to'facilitate holding said retaining plate against movement relative to said cylinder, said plug having a rear end projecting beyond said rim, the projecting end of said plug being provided with a groove having an inner edge fiush with the outer surface of said rim, and a guard engaging said groove and overlying a portion of said retaining plate to retain said plug and said retaining plate against separation from said cylinder.

3. A look comprising a cylinder having an axial bore for reception of a rotatable plug, a rotatable plug positioned in said axial bore, said cylinder and said plug having aligned transverse bores to receive lock tumblers, said cylinder having a longitudinally extending recess overlying the open ends of said transverse bores, an angular retaining plate having its longitudinal edges engaged with the edges of the recess in said cylinder to retain tumblers in said transverse bores, said plug having a boss projecting from its rear end beyond the rear surface of said cylinder, a spring pressed pin projecting from the rear end of said plug adjacent said boss, the opposite edges of said boss having undercut grooves, and a guard overlying one end of said retaining plate and slidably engaged with said grooves to hold said plug and said retaining plate from separation from said cylinder, said guard having in aperture engaged with said spring pressed pin to prevent accidental displacement of said guard.

4. A lock as described in claim 2, said groove extending circumferentially around said projecting end, and said guard having an annular portion provided with ears fitting into said circumferential groove to hold said plug against separation from said cylinder.

5. A lock as described in claim 2, said groove extending circumferentially around said projecting end, said projecting end of said plug having a transverse recess, said guard having an annular portion fitting over the projecting end of said plug and having inwardly extending ears fitting in said groove, said guard having a shank provided with a recess aligned with said transverse recess, and a guard bar ment of said guard.

5 6 6. A lock as described in claim 2, said groove extending References Cited in the tile of this patent circumferentially around said projecting end, said project- UNITED STATES PATENTS ing end of said plug having a transverse recess, said guard having an annular portion fitting over the project- 1'255473 Shaw 1918 ing end of said plug and having inwardly extending 5 1598551 Braumng 1926 ears fitting in said groove to prevent separation of said 2942025 schlage May plug fromsaid cylinder, said guard having a shank en- 2135'323 Branungson 3 gageable with said retaining plate to prevent accidental I FOREIGN PATENTS displacement of said plate, said shank provided with a 9479 Austria Nov 10 1923 recess aligned with said transverse recess, and a guard bar 10 u slidable into said recesses to prevent accidental displace ment of said guard.