US3733865A

US3733865A - Protective components for locks

Info

Publication number: US3733865A
Authority: US
Inventors: A Vorob
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-02-11
Filing date: 1972-02-11
Publication date: 1973-05-22
Anticipated expiration: 1990-05-22

Abstract

A kit of interrelated protective components for safeguarding rim cylinder locks mounted in doors, such components including (1) a mounting sleeve that fits over a conventional cylinder lock as it extends through a door, (2) reinforcing plates that are seated on the inner side of the door adjacent to the deadbolt for the lock, and (3) adapter means for securing locks of different sizes snugly within the sleeve and flush with the outer side of the door. The sleeve includes an annular lip that fits against the outer side of the door, a substantially cylindrical body, bentover tabs with apertures therein to receive the elongated mounting screws that engage similar holes in the lock to retain the lock within the sleeve; and spaced ears that are bent into engagement with the rear face of the door to securely anchor the tube thereto. One reinforcing plate has an indented portion so that the second reinforcing plate can be seated therein; both plates have central apertures that enable the tongue of the cylinder lock to pass freely therethrough and screw holes to accomodate the pair of elongated mounting screws that hold the lock in position within the sleeve. The adapter means comprise an annular ring, a shim and a wedge that is forced into the ring to secure same to the body of the cylinder lock; such components enable locks having different sized front lips to be secured within the body of the mounting sleeve.

Description

United States Patent 1 Vorob [54] PROTECTIVE COMPONENTS FOR LOCKS [76] Inventor: Arthur Vorob, 18 Spring Street,

Wallington, NJ. 07057 [22] Filed: Feb. 11, 1972 [21] Appl. No.: 225,509

Primary ExaminerRobert L. Wolfe AttorneyEric P. Schellin et al.

[57] ABSTRACT A kit of interrelated protective components for [111 3,733,865 51 May 22,1973

safeguarding rim cylinder locks mounted in doors, such components including (1) a mounting sleeve that fits over a conventional cylinder lock as it extends through a door, (2) reinforcing plates that are seated on the inner side of the door adjacent to the deadbolt for the lock, and (3) adapter means for securing locks of different sizes snugly within the sleeve and flush with the outer side of the door. The sleeve includes an annular lip that fits against the outer side of the door, a substantially cylindrical body, bent-over tabs with apertures therein to receive the elongated mounting screws that engage similar holes in the lock to retain the lock within the sleeve; and spaced ears that are bent into engagement with the rear face of the door to securely anchor the tube thereto. One reinforcing plate has an indented portion so that the second reinforcing plate can be seated therein; both plates have central apertures that enable the tongue of the cylinder lock to pass freely therethrough and screw holes to accomodate the pair of elongated mounting screws that hold the lock in position within the sleeve. The adapter means comprise an annular ring, a shim and a wedge that is forced into the ring to secure same to the body of the cylinder lock; such components enable locks having different sized front lips to be secured within the body of the mounting sleeve.

19 Claims, 11 Drawing Figures Patented May 22, 1973 3,733,865

2 Sheets-Sheet 1 F/G./. F/6.2.

' 'IIII.

20 p {:1 A s Patented May 22. 1973 2 shun-sheet 2 PROTECTIVE COMPONENTS FOR LOCKS BACKGROUND OF THE INVENTION 1. Field of the Invention The instant invention relates generally to protective components for locks, and more particularly to a kit of unique interrelated components that retain cylinder rim locks of different sizes and shapes in a tamperproof mounting.

2. Background of the Invention The continuing upsurge of burglaries has prompted lock manufacturers to devise sundry cylinder rim lock configurations that will defeat, or at least deter, a burglar. One common approach has centered about devising a pick-proof rim cylinder lock with complex tumbler designs, special key features, key-hole shielding mechanisms, etc. Another common approach has focused upon case-hardening the exposed face of the lock so that it could not be destroyed by manual tools, such as a hammer and chisel or crowbar. Another approach has relied upon the combination of case hardening and pick-proofing techniques; an example of this approach is disclosed in US. Pat. No. 3,499,302 issued to Spain et al. on Mar. 10, 1970 such lock is sold under the MEDECO trademark. Still another approach has attempted to mount the lock flush with the front side of the door so that manual tools can not be used to pry the lock loose from its mounting.

While such re-designed lock configurations have presented greater obstacles to burglars, comparable changes have not been made in the manner of mounting cylinder locks. Consequently, the locks have been defeated by slipping a crowbar or claw hammer between the flange and the front surface of the door and then pulling the entire lock free from the door. Alternatively, cylinder locks have been defeated by driving them rearwardly through the door. Cylinder locks have also been defeated by rotating same until the cylinder pulled away from its mounting screws. Furthermore, many of the locks were overcome simply by pulling the lock partially out of the door so that the mounting screws were visible; then the screws have been severed by driving a chisel or screwdriver therethrough.

Furthermore, such redesigned lock configurations, if they are to offer increased security, would require the removal and replacement of several million existing residential locks.

SUMMARY Thus, with the deficiencies of known cylinder lock configurations clearly in mind, the instant invention contemplates a kit of readily installed protective components that can be easily installed by the homeowner or the locksmith to safeguard previously installed locks or to safeguard newly re-designed locks as they are being installed. The protective components include a mounting sleeve, reinforcing plates, and adapter means, such as a ring, a shim, and a wedge.

The mounting sleeve enables the cylinder lock to be mounted therein with its face flush with the front of the door, so that a tool can not be slipped behind the lip of the lock to pull the lock free from its mounting. Bentover, spaced ears at the rear of mounting sleeve enable the sleeve to be anchored by screws to the rear face of the door, and tabs with apertures enable the cylinder lock to be secured to the sleeve by elongated screws. By virtue of this arrangement, the cylinder lock can not be pried out of the sleeve, the sleeve can not be pulled out of the door, the cylinder lock can not be rotated to thereby open the deadbolt, and the entire lock assembly can not be pushed rearwardly through the door.

In order to enable the mounting sleeve to be utilized in conjunction with all types of cylinder locks despite the variations in size of such locks, adapter means including an annular ring, a shim, and a wedge are contemplated. Utilization of the adapter means seats the front face of the lock flush with the mounting sleeve, while the shim conceals the screws and prevents same from being severed if the cylinder lock is pulled partially out of the mounting tube.

The protective devices further contemplate a pair of reinforcing plates that are secured to the rear face of the door; such plates further strengthening the mounting sleeve so that the lock can not be pried free from the door.

Furthermore, the protective components function singly, or in cooperation with each other; accordingly, such devices may be sold as individual components, or as a kit, to be installed by the homeowner to safeguard existing locks or new lock installations. Alternatively, such devices may be sold to a locksmith for similar purposes. It will be appreciated that the components are simple in design, relatively inexpensive to manufacture, and easy to install, thus contributing to the mass production of a low cost kit of parts with widespread consumer appeal.

Yet additional advantages of the instant protective devices will become apparent to the skilled artisan upon inspection of the illustrative drawings and accompanying descriptive material.

DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a portion of the outer side of a door with a cylinder lock secured therein;

FIG. 2 is a perspective view of the corresponding portion of the inner side of the door with the cylinder lock secured therein;

FIG. 3 is an exploded perspective view of the cylinder lock, the mounting sleeve, the elongated screws for securing the lock to the sleeve, and a deadbolt positioned upon the inner side of the door;

FIG. 4 is an exploded perspective view of the inner side of the door showing the spaced ears on the mounting sleeve secured to the door;

FIG. 5 is a side elevational view of the cylinder lock secured within the mounting sleeve which has been anchored to the rear face of the door;

FIG. 6 is an exploded perspective view of the cylinder lock and the reinforcing plates;

FIG. 7 is a side elevational view of the reinforcing plates of FIG. 6 secured in operative relationship to the mounting sleeve and cylinder lock;

FIG. 8 is an exploded perspective view of the annular ring and shim of the adapter means;

FIG. 9 is a side elevational view of the annular ring and shim of FIG. 8 secured in operative relationship to the mounting sleeve and cylinder lock;

FIG. 10 is an exploded perspective view of the annular ring and wedge of the adapter means, and

FIG. 11 is a side elevational view of the annular ring and wedge of FIG. 8 secured in operative relationship to the mounting sleeve and cylinder lock.

DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now to a description of the protective devices constructed in accordance with the principles of the instant invention, wherein identical elements are identified by identical reference characters, FIGS. 1 and 2 depict opposite sides of a door. The front side is identified by reference numeral 10, while the rear side is identified by reference numeral 12. A door knob 14 is situated below a cylinder lock of conventional design indicated generally by reference number 16. Lock 16, when actuated by a key, trips a conventional deadbolt 18 secured to the inner side of the door. Deadbolt 18 is thus released from locking engagement with lock plate 20 secured upon jamb 22. By grasping and turning doorknob 14, or corresponding knob 24, the door can then be swung open by pivoting same about its hinges (not shown).

FIG. 3 ilustrates the manner in which the mounting sleeve constructed in accordance with the principles of the instant invention is anchored to inner side 12 of the door, and then lock 16 is secured to the sleeve, which is indicated generally by reference numeral 26. Lock 16, which may be a Medeco lock, comprises, inter alia, an enlarged front lip 28, a cylindrical body 30, a pair of threaded

holes

32, 34 extending inwardly from the rear face of body 30, and a tongue 36 extending rearwardly from body 30. Tongue 36, enters a slot (not shown) in deadbolt 18, so that rotational movement of the tongue operates the deadbolt in a well-known manner.

Mounting sleeve 26 comprises a front lip 38, a substantially cylindrical body 40, a pair of bent-over

tabs

42,44, and four spaced

ears

46,48, 50 and 52. The tabs and the ears are situated at the rear of the mounting sleeve and are integrally formed therewith. As best shown in FIG. 5, body 40 includes a rearwardly tapering sector 54 that serves as an abutment to axially located lock 16 within sleeve 26. A drain hole 55 is provided in the sleeve and enables the lock to be periodically oiled.

Sleeve 26 is secured to inner side 12 of the door in the following manner. Initially, a hole 56 is bored through the door, such hole being slightly larger in diameter than the diameter of body 40 of sleeve 26. The sleeve is then pressed through hole 56 until lip 38 engages the front side of the door and

ears

46, 48, S0 and 52 extend beyond the rear side 12 of the door.

The four ears on sleeve 26 are spaced at 90 intervals about the sleeve. Only two ears are necessary to anchor the sleeve to the door, but four ears are provided so that mounting sleeve 26 can be used with equal facility for doors opening to the left or to the right. The two

ears

50, 52 farthest from the hinges are bent over against the inner side 12 of the door with a plier or a hammer while the two ears, 46, 48 closest to the hinges are severed from sleeve 26 by exerting a twisting motion thereupon with a pair of pliers or by cutting same with a metal shear. The bent-over ears are then anchored on the inner side 12 of the door by screws, nails, or

bolts

62 and 64 which are passed through appropriate holes near the free ends of

ears

50 and 52.

With sleeve 26 anchored in position, the lock 16 is then secured in fixed position within the sleeve. This is achieved by threading

elongated screws

63 and 65 through apertures in bent-over

tabs

42 and 44 on sleeve 26, and into threaded

recesses

32 and 34 in lock 16. By advancing or taking up on

screws

63, 65 from the inner side of the door, lock 16 is moved backwardly until its lip 28 is flush with, or spaced slightly interiorly of, lip 38 on sleeve 26, as shown in FIG. 5. Tapering section 54 assists in properly locating the lock within the sleeve and also prevents the lock from being shoved rearwardly through the door. Tongue 36 extends rearwardly to actuate deadbolt 18 while the template (not shown) usually provided with the deadbolt is discarded.

FIGS. 6 and 7 depict another protective component that can be used singly or in combination with mounting sleeve 26 of FIGS. 35. Such protective component assumes the form of a pair of

metal reinforcing plates

70, 72. Reinforcing plate has an annular flange 74 and a central slightly dished section 76. A cut-out 78 enables tongue 36 of lock 16 to pass freely therethrough, while threaded

apertures

80 and 82 enable

elongated screws

63, 65 to pass therethrough. Reinforcing plate 72 is smaller in size than plate 70 and fits within dished section 76. Plate 72 also has a central cut-out 84 to enable tongue 36 to pass therethrough, and threaded

apertures

86 and 88 enable the elongated screws to pass therethrough. The reinforcing plates are placed on the rear side 12 of the door, interiorly of deadbolt 18.

FIG. 7

shows reinforcing plates

70 and 72 secured to the rear side 12 abutting against

ears

50, 52 of sleeve 26. The reinforcing plates prevent lock 16 from being pried free from the door without first destroying or materially damaging the door.

Mounting sleeve 26 is designed to tit and function successfully with all commercially available cylinder locks. However, the diameter of the lips 28 of the cylinder locks produced by various manufacturers vary by as much as a quarter of an inch. Consequently, while the inner diameter of sleeve 26 has been selected to be 1 5/16 inches to accomodate the most common diameter size for lip 28, many locks have smaller lips and would slide axially within sleeve 26 unless prevented from doing so in some manner.

The simple adapter means for modifying all cylinder locks to fit snugly within sleeve 26 is shown in FIGS. 8-11. The adapter means includes an annular ring 86 with an angled slot 88, a shim 90, and a wedge 92. Shim 90 has a central cut-out 94 and a pair of threaded

apertures

96 and 98; threaded to receive

screws

65 and 63 in FIG. 3; the contour of the cut-out conforms to the outline of body 30 of lock 16, so that the shim can be seated thereon.

Referring now in greater detail to FIGS. 8 and 9, the outline of lock 16 is that of the well-known and widely used household lock sold under the SEGAL trademark which is the property of Marshall Tool Co. of Norwalk, Connecticut. Such lock is characterized by an annular shoulder 29 behind annular lip 28, a ridge 31 extending rearwardly from shoulder 29, and

ears

33, 35 that receive

elongated screws

63 and 65. In order to secure such lock within sleeve 26, ring 86 is slipped over ridge 31 until it abuts against lip 28 and engages shoulder 29. Then shim 90 is forced between ring 88 and

ears

33, 35 to take up all the slack previously existing between these two members. After ring 88 and shim 90 are in place on lock 16, the entire assembly is then slipped into sleeve 26 and the sleeve is secured to the door in the manner detailed above. Ring 88 acts as a continuation of lip 28 so that a manual tool can not be slipped between lock 16 and sleeve 26 to pull the lock out of the sleeve. Shim 90 shields elongated mounting

screws

63, 65 so that a screwdriver or chisel can not be driven thereagainst to defeat the lock.

Referring now in greater detail to FIGS. and 11, the outline of lock 16 is that of the well-known and widely used household lock sold under the Illinois trademark and manufactured by the Illinois Lock Co. of Wheeling, Illinois. Such lock is characterized by a generally horizontal body surface 37 with a pair of spaced

ribs

39, 41.

Screws

63 and 65 are received in threaded tubes situated on each side of surface 37. In order to secure such lock within sleeve 26, ring 86 is slipped over surface 37 until it abuts against lip 26. Then wedge 92 is horizontally oriented and forced inwardly along

ribs

39, 41 until ring 86 is held in fixed position. Subsequently, lock 16 with the ring and the wedge secured thereto, is slipped into sleeve 26 and the sleeve is secured to the door in the manner detailed above. Wedge 92 is selected to be the size of a minor chord of ring 86.

Although the lock configuration of FIGS. 8 and 9 only require the utilization of ring 88 and shim 90, and the lock configuration of FIGS. 10 and 11 require only the utilization of ring 88 and wedge 92, certain lock configurations require utilization of all three components of the adapter means. Numerous additional modifications in the size, shape, and orientation of the various components of the instant protective devices will occur to the skilled artisan; furthermore the kit of protective components could easily be modified to safeguard other types of locks by the skilled artisan; ac cordingly, the invention should be broadly construed commensurate with the scope of the technical advances set forth above.

I claim:

1. Protective components for locks, comprising, in combination,

a. a rim cylinder lock including a lock body, an annular front lip, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face,

b. protective components for safeguarding said lock,

said protective components including 1. a mounting sleeve having a cylindrical body, an

annular front lip, and bent-over tabs at the rear of said body,

2. the inner diameter of said cylindrical body being larger than the annular lip of said lock so that said lock can be inserted into said mounting sleeve, and

c. screw means extending through said bent-over tabs and into the holes in said lock body so that said lock body is firmly secured to said mounting sleeve.

2. The combination as defined in claim 1 wherein the cylindrical body of said mounting sleeve further comprises a plurality of ears spaced about the rear of said body, said ears being adapted to be bent over by approximately 90 against a door.

3. The combination as defined in claim 2 wherein the ears that are not bent over can be severed from the cylindrical body by a manual tool.

4. The combination as defined in claim 2 wherein the 6 free ends of sald ears have holes formed therein to permit mounting means to pass therethrough and thus enable the sleeve to be anchored to a door.

5. The combination as defined in claim 1 wherein the cylindrical body of said mounting sleeve has a drainage hole formed therein.

6. The combination as defined in claim 1 wherein a 5 tapered section is formed at the rear of said cylindrical body, said section aiding in locating the lock within the sleeve and preventing same from being forced rearwardly through said body.

7. The combination as defined in claim 1 wherein said protective components further include reinforcing means located in operative relationship to said mounting sleeve, said reinforcing means having a central cutout and a pair of spaced holes formed therein, said central cut-out enabling the tongue of said lock to pass freely therethrough, and said spaced holes permitting said screw means to pass therethrough before entering said tab means and said holes in said lock body. I

8. The combination as defined in claim 7 wherein said reinforcing means comprises a larger plate with a central dished area, and a smaller plate, said smaller plate fitting within said dished area.

9. The combination as defined in claim 1 wherein said protective components further include adapter means for enabling locks with front lips of varying diameters to fit snugly within said mounting sleeve.

10. The combination as defined in claim 9 wherein said adapter means includes an annular ring with a slot therein, the slot imparting resilience to the ring so that said ring can he slipped onto the lock body in abutting relationship to the annular lip on said lock body.

11. The combination as defined in claim 10 wherein said adapter means further includes a disk-like shim having a cut-out, the shape of the cut-out being selected to conform to the outline of the said lock body, said shim being seated upon said lock body in abutting relationship to the rear surface of said annular ring.

12. The combination as defined in claim 11 wherein said shim has a pair of spaced holes formed therein, said holes permitting said screw means to pass therethrough.

13. The combination as defined in claim 10 wherein said adapter means further includes a wedge, said wedge being equal in size to a minor chord of said annular ring, so that said wedge can be forced between said lock body and the inner diameter of said ring to retain said ring in fixed position upon the lock body.

14. A kit of protective components for installation upon previously installed rim cylinder locks, said kit including a. a mounting sleeve having a cylindrical body, an annular front lip, bent-over tabs at the rear of said body,

b. the inner diameter of said cylindrical body being larger than the outer diameter of a cylinder lock, so that a lock can be inserted into said mounting sleeve,

c. screw means for passing through said bent-over tabs in order to secure the lock within said mounting sleeve,

d. a plurality of ears spaced about the rear of the cylindrical body of said mounting sleeve, and

e. said ears being adapted to be bent over by 90 to abut against a mounting surface.

15. The kit of protective components as defined in claim 14 further including reinforcing means adapted to be positioned in operative relationship to said mounting sleeve.

16. The kit of protective components as defined in claim 14 further including adapter means for enabling locks of varying sizes to be inserted within said mounting sleeve.

17. Protective components for locks, comprising, in combination,

a. a door having an annular hole bored therethrough,

b. a rim cylinder lock including a lock body, an annular front lip lesser in diameter than the annular hole in the door, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face,

c. protective components for safeguarding said lock,

said protective components including:

1. a mounting sleeve having a cylindrical body, an annular front lip, said lip greater in diameter than the annular hole in the door, and bent-over tabs at the rear of said body,

2. the inner diameter of said cylindrical body being larger than the annular lip of said lock so that said lock can be inserted into said mounting sleeve,

3. the outer diameter of said cylindrical body being slightly smaller than the diameter of the annular hole bored therethrough,

4. a plurality of ears spaced about the rear of said body, said ears being bent over by approximately 90 to engage one side of the door,

5. said ears having holes formed adjacent to their free ends,

6. securement means passing through the holes in said ears for anchoring said mounting sleeve to said door, and

d. screw means extending through said bent-over tabs and into the holes in said lock body so that said lock body is firmly secured to said mounting sleeve.

18. A method of safeguarding a lock to be mounted within an annular hole bored through a door, the lock including a lock body, an annular front lip, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face, said method including the steps of:

a. inserting into the hole a mounting sleeve including a cylindrical body, an annular front lip, bent-over tabs and a plurality of ears spaced about the rear of the cylindrical body,

b. positioning the mounting sleeve so that its front lip bears against one side of the door,

c. bending-over the ears of the mounting sleeve so that they bear against the opposite side of the door,

d. anchoring the ears to the opposite side of the door,

e. inserting the cylinder lock within the cylindrical body of the mounting sleeve, and

f. securing the lock to the sleeve by inserting and then tightening, elongated screw means that are passed through the bent-over tabs of the sleeve and into the threaded holes in the lock.

19. The method as defined in claim 18 wherein said method further includes the step of severing with a manual tool those ears on the mounting sleeve that are not bent-over against the opposite side of the door.

Claims

1. Protective components for locks, comprising, in combination, a. a rim cylinder lock including a lock body, an annular front lip, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face, b. protective components for safeguarding said lock, said protective components including 1. a mounting sleeve having a cylindrical body, an annular front lip, and bent-over tabs at the rear of said body, 2. the inner diameter of said cylindrical body being larger than the annular lip of said lock so that said lock can be inserted into said mounting sleeve, and c. screw means extending through said bent-over tabs and into the holes in said lock body so that said lock body is firmly secured to said mounting sleeve.

2. The combination as defined in claim 1 wherein the cylindrical body of said mounting sleeve further comprises a plurality of ears spaced about the rear of said body, said ears being adapted to be bent over by approximately 90* against a door.

2. the inner diameter of said cylindrical body being larger than the annular lip of said lock so that said lock can be inserted into said mounting sleeve, and c. screw means extending through said bent-over tabs and into the holes in said lock body so that said lock body is firmly secured to said mounting sleeve.

4. The combination as defined in claim 2 wherein the free ends of said ears have holes formed therein to permit mounting means to pass therethrough and thus enable the sleeve to be anchored to a door.

4. a plurality of ears spaced about the rear of said body, said ears being bent over by approximately 90* to engage one side of the door,

5. said ears having holes formed adjacent to their free ends,

6. The combination as defined in claim 1 wherein a tapered section is formed at the rear of said cylindrical body, said section aiding in locating the lock within the sleeve and preventing same from being forced rearwardly through said body.

6. securement means passing through the holes in said ears for anchoring said mounting sleeve to said door, and d. screw means extending through said bent-over tabs and into the holes in said lock body so that said lock body is firmly secured to said mounting sleeve.

7. The combination as defined in claim 1 wherein said protective components further include reinforcing means located in operative relationship to said mounting sleeve, said reinforcing means having a central cut-out and a pair of spaced holes formed therein, said central cut-out enabling the tongue of said lock to pass freely therethrough, and said spaced holes permitting said screw means to pass therethrough before entering said tab means and said holes in said lock body.

10. The combination as defined in claim 9 wherein said adapter means includes an annular ring with a slot therein, the slot imparting resilience to the ring so that said ring can be slipped onto the lock body in abutting relationship to the annular lip on said lock body.

14. A kit of protective components for installation upon previously installed rim cylinder locks, said kit including a. a mounting sleeve having a cylindrical body, an annular front lip, bent-over tabs at the rear of said body, b. the inner diameter of said cylindrical body being larger than the outer diameter of a cylinder lock, so that a lock can be inserted into said mounting sleeve, c. screw means for passing through said bent-over tabs in order to secure the lock within said mounting sleeve, d. a plurality of ears spaced about the rear of the cylindrical body of said mounting sleeve, and e. said ears being adapted to be bent over by 90* to abut against a mounting surface.

17. Protective components for locks, comprising, in combination, a. a door having an annular hole bored therethrough, b. a rim cylinder lock including a lock body, an annular front lip lesser in diameter than the annular hole in the door, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face, c. protective components for safeguarding said lock, said protective components including:

18. A method of safeguarding a lock to be mounted within an annular hole bored through a door, the lock including a lock body, an annular front lip, a rear face, spaced threaded holes in proximity to the rear face, and a rotatable tongue extending rearwardly beyond the rear face, said method including the steps of: a. inserting into the hole a mounting sleeve including a cylindrical body, an annular front lip, bent-over tabs and a plurality of ears spaced about the rear of the cylindrical body, b. positioning the mounting sleeve so that its front lip bears against one side of the door, c. bending-over the ears of the mounting sleeve so that they bear against the opposite side of the door, d. anchoring the ears to the opposite side of the door, e. inserting the cylinder lock within the cylindrical body of the mounting sleeve, and f. securing the lock to the sleeve by inserting and then tightening, elongated screw means that are passed through the bent-over tabs of the sleeve and into the threaded holes in the lock.