US3901058A

US3901058A - High security lock and hasp

Info

Publication number: US3901058A
Authority: US
Inventors: Walter E Best
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-11-27
Filing date: 1974-04-01
Publication date: 1975-08-26
Anticipated expiration: 1992-08-26

Abstract

A high security lock to secure the eyes of a hasp and keeper. The lock is formed of a housing of short cylindrical shape and a rear closure plate, in locked breech-lock engagement, which together define a cavity to receive and enclose the hasp and keeper eyes. The housing contains a locking bolt in a transverse trough and contains two lock cores in separate chambers. One core is operable by a key inserted through a front access opening and drives a pivoted lever to actuate the bolt. The other core fits through an opening in the closure plate and blocks breech lock release. The openings and cavities of the housing open to the rear and are shaped to be formed by die cores, so that both the housing and closure may be made as castings requiring a minimum of machining. The lock and the hasp and keeper assembly interact to give high security. The lock encloses and closely embraces the eyes of the hasp and keeper and lies close against the pads of the hasp and keeper. The lock presents a rounded front surface to impede forceful attack, and shroud plates overlying the pads closely surround the rear edge of the lock. The shrouds and plates of the hasp meet those of the keeper at a separation plane offset from that of the eyes and of the door and its jamb.

Description

14 1 Aug. 26, 1975 O United States Patent 1 Best [ 1 HIGH SECURITY LOCK AND HASP [76] Inventor: Walter E. Best, c/o Best Lock Corporation PO. Box 103, lndianpolis, 1nd. 46206 [22] Filed: Apr. 1, 1974 [21] Appl. No.: 456,557

Related US. Application Data [63] Continuation-in-part of Scr. No. 309,761, Nov. 27,

1972, Pat. No. 3,820,360.

[52] US. Cl. 70/32; 70/6 [51] Int. Cl. E05B 67/36 [58] Field of Search 70/2, 3, 4, 5, 6, 7, 8, 70/9,10, 11, 12,13, 23, 32, 33, 34, 54, 367, 368, 369, 417; 292/281 [56] References Cited UNITED STATES PATENTS 834,591 10/1906 Streams 70/6 1,814,646 7/1931 Terrill 70/6 1,866,955 7/1932 Terrill.... 70/6 2,660,872 12/1953 Beach.... 70/32 3,820,300 6/1974 Best 70/32 Primary Examiner-Robert L. Wolfe Attorney, Agent, or Firm]enkins, Hanley & Coffey [57] ABSTRACT A high security lock to secure the eyes of a hasp and keeper. The lock is formed of a housing of short cylindrical shape and a rear closure plate, in locked breech-lock engagement, which together define a cavity to receive and enclose the hasp and keeper eyes. The housing contains a locking bolt in a transverse trough and contains two lock cores in separate cham bers. One core is operable by a key inserted through a front access opening and drives a pivoted lever to actuate the bolt. The other core fits through an opening in the closure plate and blocks breech lock release. The openings and cavities of the housing open to the rear and are shaped to be formed by die cores, so that both the housing and closure may be made as castings requiring a minimum of machining.

The lock and the hasp and keeper assembly interact to give high security. The lock encloses and closely embraces the eyes of the hasp and keeper and lies close againstthe pads of the hasp and keeper. The lock presents a rounded front surface to impede forceful attack,- and shroud plates overlying the pads closely surround the rear edge of the lock. The shrouds and plates of the hasp meet those of the keeper at a separation plane offset from that of the eyes and of the door and its jamb.

HIGH SECURITY LOCK ANI) HASP BACKGROUND OF THE INVENTION This invention is a continuation-in-part of my prior application. Ser. No. 309,761, filed Nov. 27., 1972, and now US. Pat. No. 3,820,360 and relates to an im proved construction of a high security round lock of the type there disclosed. and a combination thereof with a hasp and keeper having overlying shroud plates arranged to protect the lock.

In this specification, the terms hasp and keeper" are used to designate two members or bars used to lock doors and the like, which have forward-projecting, apertured eyes adapted to be locked together, as by a padlock. The hasp and keeper shown are fastened to the door structure by plates or pads. but other forms may be used. For convenience, the hasp is considered to be the door-mounted or movable plate while the keeper is considered to be the frame-mounted or fixed plate. but such plates may be reversed and may be used not only on swinging and sliding single doors. but also on double doors. and these terms are for convenience only and are not to be construed as limiting.

In door-closed relationship, the eyes of the hasp and keeper project from the face of the door structure in face-to-face parallel relation. It is common practice to lock such eyes with heavy padlocks. but these have not been wholly satisfactory. It has also been proposed, as in my co-pending application, to lock the eyes together with a round lock which encloses the projecting eyes. In my co-pending application. the housing is formed of an inner lock body secured within a cup-shaped outer housing. The inner body requires machined and bored openings for the lock bolt and other working parts.

It is the purpose of the present invention to provide a round lock of the type which encloses the projecting eyes. and hich provides a high degree of security and is of relatively simple and inexpensive construction. It is a further purpose of the present invention to combine a lock of this type with a speeiallyformed hasp and keeper having overlying shroud plates which protect the lock from forced-entry attack and enhance the security provided.

SUMMARY OF THE INVENTION In accordance with the present invention, the lock body is formed of a onepiece main housing and a rear closure plate. These are held together by a rotatablyengaged retaining means. such as a breech lock, and preferably held against release by a key-removable lock-core so as to secure them against disassembly even when removed from the hasp and keeper. Both the housing and closure are shaped so that their necessary openings may be made as cored openings in castings and to require a minimum of maching. The main housing is preferably formed as a rounded body with generally cylindrical side surfaces and a rounded front, and with a recess in the rear for the closure. The housing and closure together define a rearward-open cavity offset from the center of the lock to receive and enclose the eyes of the hasp and keeper. The rear face of the housing contains a transverse trough intersecting the eye cavity and closed by the closure. which contains a slidable lock bolt to lock the two eyes together. The housing contains two chambers which receive key operated lock cores. One core is a lock-operating core having a key plug connected to operate the bolt. and

operated by a key inserted through a front opening in the housing. Such first core is wholly enclosed at the rear by the closure. The other core extends into the housing from the rear through a registering opening in the closure so as to block the closure plate against rotation to release it from the housing. The closure plate is preferably formed with a shallow flat cavity in its rear face. in which an operating lever is pivotally mounted to connect the operating core with the bolt.

To enhance the resistance of the lock to cutting and like forced-entry attack, the lock housing may be cored to receive hardened steel pins, and formed to receive hardened plates opposite one or both ends of the bolt.

The hasp and keeper provided in accordance with the present invention comprise pads to be secured to the door and the door frame. having forward-projecting apertured eyes which in locking position lie in face-toface parallel relation for reception into the formed cavity in the lock. Desirably, shroud plates overlie the pads of the hasp and keeper and closely surround the rear edge of the lock to prevent insertion of a prying bar or the like behind the lock.

Desirably, the eyes are positioned at the meeting edges of the door and door jamb so as to have a common separation plane therewith, and the separation plane between the meeting edges of the hasp and keeper pads is offset therefrom in the direction toward the door jamb. so that the hasp pad and shroud plate overlap the jamb. This allows the shroud plates to be symmetrical and places the eyes in an offset position in the recess defined by the shroud plates to match the offset position of the eye-receiving cavity in the lock. The offset separation planes enhance security against cutting.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate the invention and show an exemplifying embodiment. In such drawings:

FIG. 1 is a horizontal section taken on the line ll of FIG. 3. showing a lock in locked relation with a hasp and keeper. in accordance with the invention;

FIG. 2 is a fragmental front elevation of the assembly shown in FIG. 1;

FIG. 3 is an isometric view of the hasp and keeper assembly, shown'in relation to a door and a jamb;

FIG. 4 is a perspective view of the lock housing;

FIG. 5 is a perspective view of the lock closure plate;

FIG. 6 is a rear elevation of the locking housing with parts assembled therein ready for application of the closure plate;

FIG. 7 is a section taken on the line 77 of FIG. 6, showing a section of an assembled lock;

FIG. 8 is an isometric view of a key-removable core used in accordance with the invention; and

FIG. 9 is a horizontal section, like FIG. 1, showing a modified assembly arrangement. in which the pad plates of the hasp and keeper are mounted against the rear face of the door structure and the shroud plates are mounted against the front face of the door structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The lock 10 shown in the drawings comprises a housing 12 of generally circular cross-section with a rounded front portion. closed at the rear by a closure l4 seated in a recess in the housing. The lock defines a rearwardly open chamber 16 to receive the

forward projecting eyes

18 and 20 of a hasp 22 and keeper 24, and contains a slidable bolt 26 which is shown in FIG. I in locked position engaged in the apertures of the

eyes

18 and 20.

The hasp and keeper are preferably as shown in FIGS. l3. The hasp 22 has a rear pad fastened to a door 30, and the keeper 24 has a rear pad fastened to a door jamb 32 or to a companion door. As shown in FIG. 3, the hasp 22 is formed of heavy metal plate of generally rectangular configuration, with a pair of slots 34 formed in its right edge to define between them a tab which is apertured and bent forward to form the eye 18 offset inward from the right edge of the hasp. The keeper 24 is of similar metal plate, of generally rectangular configuration, but does not have notches 34 at its edge and instead is formed with a projecting tab which is apertured and bent forward to form the eye 20 offset outward from the left edge of the keeper.

A shroud plate 36 overlies the pad of the hasp 22, and is formed of similar steel plate and rectangular configuration but has a semicircular cut-out 38 at its right edge. A similar shroud plate 40 overlies the keeper pad 24, and this likewise has a semicircular cut-out 42. The two cut-outs are complementary so that the two shroud plates define a circular recess 44 which contains the rear end of the lock 10 when such lock is in locked position as shown in FIG. 1.

As seen in FIGS. 2 and 3, the adjacent edges of the hasp assembly and keeper assembly lie in closely spaced relation and define a separation slot 46 which is offset from the

eyes

18 and 20. Preferably, the meeting faces of the eyes 18 and 2() lie coplanar with the separation slot 48 between the door and the jamb 32, while the separation slot 46 is offset therefrom toward the keeper. This causes the upper and lower portions 33 and of the hasp pad to project across the separation slot 48 between the door and jamb, and overlap the edge of the jamb 32. The

separation slots

46 and 48 are thus out of alignment so as to hinder insertion of a saw to saw the lock.

The hasp and keeper assemblies may be secured to the door andjamb by bolts. As shown, the hasp pad 22 and its overlying shroud plate 36 are provided with registering bolt holes 50, and the holes in the plate 36 are recessed and shaped to receive the heads and squared shanks ofcarriage bolts 52. The squared shank portions of such bolts fit in complementary squared portions of the holes 50 to prevent the bolts from being turned from the outside. In addition to two bolt holes 50, the hasp pad has a bolt hole 54 close to the base of the eye 18. This is provided with a tapered seat to receive the flat head of a bolt 56, and such head lies at or below the face ofthe hasp pad 22 and partially underlies the overlying shroud plate 36. The keeper assembly is similarly mounted. It has two shaped and recessed bolt holes to receive carriage bolts 53, and has a bolt hole 55 close to the base of? the eye 20 to receive the flatheated bolt 57. The bolts;56 and 57 may be slotted as usual with flathead bolts or may be break-away bolts which originally have gripping projections which are broken off after the bolts'have been set.

When a lock 10 is locked on the hasp and keeper, its cavity 16 totally encloses and surrounds the eyes I8 and 20, and itsgbolt 26 is deadlocked through the apertures of those The rear edge of the housing 12 lies within the recess 44 defined by the

shroud plates

36 and 40, and such shroud plates closely surround the rear edge of the lock to prevent insertion of a pry bar or other tool between the lock and the hasp or keeper. 5 The hasp and keeper assembly here shown may be made in a size and proportions for use with a lock as shown in my prior co-pending application, Serial No. 309.761, but as here shown in preferably used with a lock 10 of the construction shown in FIGS. 4-8.

The lock shown in FIGS. 4-8 comprises the housing 12 and a closure member 14, both of which are adapted to be made as precision castings and to require a minimum of machining. The housing 12 is a solid body of circular cross-sections with a rounded front end. At the rear, it has a short section 58 of truly cylindrical shape, and a longer forward portion 60 of generally frusto conical configuration. The housing 12 is shaped to form a rearward-open rectangular eye-receiving cavity 16, and a transverse trough 62 forming a slideway for the bolt 26. At the forward end of such trough 62, it connects with a wider and deeper slot 64 having a round bottom, which receives a pair of hardened steel plates 66 lying across the end of the bolt 26 to prevent drilling the bolt.

The housing 12 also has a rearward-open chamber 68 to contain an operating lock core 70. Such lock is preferably of the type shown in FIG. 8. This comprises a lock body of figure-8 shape having a lower lobe containing a key plug 72, and an upper lobe which contains pin tumblers. The core includes a retaining lug 74 shown in projecting position in FIG. 8, which is adapted to be retracted into the body of the core by operation of a special control key 76. The cavity 68 is of corresponding figure-8 cross-section, and has clearance at the side for the lug 74. As shown in FIG. 7, the lobe of the cavity 68 which contains the key plug 72 extends forward from the main cavity 68 to provide a circular recess 78, and extends therebeyond on a smaller diameter to provide a key access opening through the front face of the housing 12. A hardened steel disc 82 is mounted in the recess 78 and the key access opening 80 and is slotted to admit a key to the key plug 72.

The body of the housing 12 is also formed with a blind second cavity 84 of figure-8 cross-section, to receive a second lock core 70 to retain the closure 14 in place, as described below.

The rear of the housing 12 is formed with a generally circular recess 86 to receive the closure plate 14. Such recess has a series of circumferentialIy-spaced rectangular notches 88 about its periphery. The thick wall about the recess 86 and containing the notches 88 is machined to undercut the material between the notches 88, so as to leave inwardly projecting lugs 90 for breech lock engagement with the closure plate 14 which is seated in the recess 86. As shown in FIG. 5, the closure plate 14 is a generally circular disc having projecting lugs 92 spaced about its periphery and arranged to register with the notches 88 of the housing 12. The closure plate 14 contains an opening 96 which registers with the cavity 16 in the housing 12 to admit the hasp and

keeper eyes

18 and 20 thereto. The closure also has an opening 98 of figure-8 shape positioned to register with the cavity 84 of the housing 12 when the closure plate is in locked position in the housing 12. The inner face of the closure 14 is formed with a shallow sector'shaped recess 100 to provide clearance space for a throw lcvcr 102 for actuating the bolt 26.

For assemblying the closure plate 14 to the housing 12. the closure is inserted in the recess 86 at the rear of the housing I2, with the lugs 92 of the closure entering the notches 88 of the housing. and the closure is then rotated clockwise to carry the lugs 92 of the closure plate beneath the lugs 90 of the housing. Such rotation carries the opening 96 of the closure plate into registry with the eye-receiving housing cavity 16. and carries the figure-8 opening 98 of the closure plate into registry with the figure-8 cavity 84. A core 70' is then inserted into the aligned opening 98 and cavity 84 and is secured in place to prevent rotation of the closure from locked to unlocked position.

For purposes of locking the core 70 in the aligned opening and cavity. the closure 14 is provided with a rearward projecting lug 104 at one edge of the opening 98, at the intersection of the two lobes of the figure-8 opening. Such lug I04 is of sufficient length so that when the core 70' is inserted. the retaining lug 74 may be moved behind the end of the lug 104 to lock the core 70' in place in the opening and cavity. The lug I04 is shown in section in FIG. 6, at the lower side of cavity 84 and at the intersection of the two lobes of the figure- 8 cavity. Since such lug 104 is on the closure which must rotate through 30 as it is assembled to the housing. it is necessary to provide a clearance path for movement of such lug 104 through 30. For this purpose. a rounded notch 106 is formed at the end of the figure-8 cross-section of the cavity 84 to provide for that 30 range of movement of the lug 104. The notch I06 needs to be only deep enough to clear the end of the lug I04.

The mechanism of the lock includes the housing 12 and the closure I4, shaped as described above. and provided with rotatably engageable retaining means such as the breech lock lugs 90 and 92 described. It also includes other mechanism. as follows: The bolt 26 is slidably mounted in the trough 62 for movement between a locked position shown in full lines and a retracted position shown in dotted lines in FIG. 6. It is moved between these two positions by the throw lever I02. which is pivoted on a pin 103 formed or inserted in the housing 12. and actuated by a crank 106 received in a slot I07 in the lever. The crank is carried by a throw member 108 positioned behind and driven by the key plug 72 of the locking core 70 mounted in the cavity 68 of the housing 12. The rear end of the key plug 72 is provided with two deep holes. which receive legs 110 on the throw member 108. The throw lever I02 lies in the shallow recess I00 and is held in place by the closure 14. The lever has a bent-over end 112 engaged in a circular notch 114 in the bolt 26. With this arrangement. operation of the key plug 72 with an operating key inserted through the slotted disc 82 will rotate the throw member 108 to carry its crank 106 from its full line position to its dotted line position in FIG. 6, and this will retract the bolt 26 from locked position to retracted position.

Assembly of the lock is as follows: A protective disc 82 is inserted in the recess 78 at the bottom of the cavity 68. An operating core 70 is then inserted with the key opening toward the disc 82. A throw member I08 is then inserted in the rear of the key plug 72 of the operating core 70. A bolt 26 is laid in the trough 62, and a throw lever I02 is engaged over the pivot 103 with its bent-over end I12 engaged in the notch of the bolt 26.

Protective plates 66 are then inserted in the cavity 64 at the end of the bolt trough 62.

With these parts in place. the closure plate -I4 is then inserted in the recess 86, with its breech-lock legs 92 in the notches 88 of the housing 12 and with its coreretaining lug 104 in the dotted line position 104a shown in FIG. 6. The closure plate is then rotated clockwise to carry the lug 104 to its position shown in section in FIG. 6. Such rotation carries'the breech-lock lugs 90 and 92 into locking engagement and carries the

closure openings

96 and 98 into registry with the housing" cavities l6 and 84. A retaining core is then inserted in the registering opening 98 and cavity 84. For this purpose, a control key 76 is inserted in the key plug 72 and rotated clockwise 15 to retract the retaining lug 74 fromits projected position as shown in FIGI S. The core is then inserted to carry the lug 74 behind the rear end of the lug 104 on the closure 14, and the control key is then turned in reverse rotation to project the retaining lug 74 behind the lug 104, and this locks the core 70' in place. The control key 76 is then withdrawn.

The lock can be disassembled only by using a control key 76 to retract the retaining lug 74 and remove the retaining core 70' fromthe opening 98 and cavity 84. Until this is done, the retaining core 70 prevents rotation of the closure 14 to an unlocked position.

Use of the lock to lock a hasp and keeper as shown in FIG. 1 is as follows: With an operating key inserted through the guard disc 82, the key plug 72 is rotated to retract the bolt 26 from its locked position as shown in FIGS. 1 and 6. The lock 10 can then be installed orremoved from the

eyes

18 and 20 of the hasp and keeper. \Vhen the lock has been installed to the position shown in FIG. 1, the operating key is rotated to advance the bolt 26 to its locking position, and the key is then removed. The lock housing then lies close against the face of the pad portion of the hasp 22 and keeper 24, with its rear end positioned in the recess formed by the

shroud plates

36 and 40. Such plates closely surround the lock to protect it from prying. The center of the lock is in the plane of the separation slot 46 between the hasp and keeper and such slot is offset from the door separation slot 48 so that the

end portions

33 and 35 of the hasp overlap the door part which carries the keeper. The combination provides a high degree of security.

The modified assembly shown in FIg. 9 is similar. In such modification, the hasp 22 is mounted with its pad against the inner face of the door 130, and the keeper 24 is mounted against the inner face of the companion door 132. The

shroud plates

36 and 40, instead of being mounted against the faces of the hasp and keeper pads, are mounted against the front faces of the doors. In this case. the separation slot 148 between the doors is coplanar with the slot 146 between the meeting edges of the hasp and keeper and their shroud plates. The edges of the doors are cut away, as with part-cylindrical notches. so that together they form a deep cylindrical recess I20 aligned with the cylindrical recess defined by the

shroud plates

36 and 40. This admits the lock 10 to be inserted through the

shroud plates

36 and 40 into engagement with the eyes I8 and 20. and to be locked in place thereon as before. The lock is then largely contained within the deep recess I20 and thereby further protected from forced-entry attack.

I claim:

l. A lock for locking a hasp eye and keeper eye projecting in adjacent parallel relation from the face ol door structure and having aligned trans\erse shacklereceiving apertures, comprising:

a housing having rear openings and a rear closure for such housing. said housing and closure together forming a rearward-open cavity to receive the projecting hasp and keeper eyes.

said housing having a transverse trough-shaped slideway formed in its rear face in intersecting relation with said cavity and rearwardly open to receive a bolt therein,

a bolt retained in said slideway by said closure and movable between a locking position across said cavity to lock the eyes therein and a retracted release position.

a core chamber formed in said housing for the reception. from the rear. of an actuating lock core having a rotatable key plug, a key opening formed at the front of said chamber to admit a key to said plugs and actuating means connecting the bolt for actuation by said key plug and mounted for assembly from the rear of the housing and enclosure by said closure.

and retaining means for securing the closure in place.

2. A lock as in claim I in which said housing and closure having rotatably-engaged retaining means there between for securing the closure in place. and a blocking element inserted in aligned openings in said housing and closure to prevent relative rotation of the closure and housing to disengage said retaining means.

3. A lock as in claim 1 in which said actuating means includes a pivoted lever having its free end engaged with the bolt. and a crank engaged therewith and operable by the key plug to swing the lever and thereby advance and retract the bolt. I

4. A lock as in claim 3 in which the lever is mounted and swingable in a shallow cavity formed between the housing and the closure.

5. A lock as in claim 3 in which said actuating means includes a throw member operable by said key plug and rotatable at the rear of said core chamber and having a crank thereon engaged with said pivoted lever.

6. A lock as in claim 2 in which said actuating means comprises a lever pivoted to said housing and extending across the rear face thereof into engagement with said bolt. and a throw member actuated by said key plug and forming a crank engaged with said lever to pivot the same and thereby actuate the bolt. said closure overlying the lever and retaining the same in operating position.

7. A lock as in claim 2 in which said aligned openings in said housing and closure are shaped to receive a retaining lock core, and said blocking element is a lock core inserted therein and having a key-operated retaining lug engageable with a portion of said housing or clo sure to retain the core in place.

8. A lock as in claim 6 in which said aligned openings in said housing and closure are shaped to receive a retaining lock core, and said locking element is a lock core inserted therein and having a key-operated retaining lug engageable with a portion of said housing or closure to retain the core in place.

9. A lock as in claim 7 in which said rotatablyengaged retaining means comprises breech locking lugs on said housing and closure. engageable by limited rotation of the closure from an insertion position to a locked position in the housing. said closure having a projection thereon extending into the housing opening which receives the retaining lock core to form a shoulder therein for engagement by said coreretaining lug. said housing opening being shaped to allow entry of said projection into said opening in insertion position of the closure and swinging movement of the projection therein to its operative position upon rotation of the closure to its locked position.

10. A lock as in claim 1 in which the openings, cavity, and chambers in the housing are open to the rear so as to be formed by \vithdrauablc cores. and the housing is formed as a casting.

11. A lock as in claim 9 in which the openings, cavity. and chambers in the housing are open to the rear so as to be formed by withdrawable cores. and the housing is formed as a casting.

Claims

1. A lock for locking a hasp eye and keeper eye projecting in adjacent parallel relation from the face of door structure and having aligned transverse shackle-receiving apertures, comprising: a housing having rear openings and a rear closure for such housing, said housing and closure together forming a rearwardopen cavity to receive the projecting hasp and keeper eyes, said housing having a transverse trough-shaped slideway formed in its rear face in intersecting relation with said cavity and rearwardly open to receive a bolt therein, a bolt retained in said slideway by said closure and movable between a locking position across said cavity to lock the eyes therein and a retracted release position, a core chamber formed in said housing for the reception, from the rear, of an actuating lock core having a rotatable key plug, a key opening formed at the front of said chamber to admit a key to said plug, and actuating means connecting the bolt for actuation by said key plug and mounted for assembly from the rear of the housing and enclosure by said closure, and retaining means for securing the closure in place.

2. A lock as in claim 1 in which said housing and closure having rotatably-engaged retaining means therebetween for securing the closurE in place, and a blocking element inserted in aligned openings in said housing and closure to prevent relative rotation of the closure and housing to disengage said retaining means.

3. A lock as in claim 1 in which said actuating means includes a pivoted lever having its free end engaged with the bolt, and a crank engaged therewith and operable by the key plug to swing the lever and thereby advance and retract the bolt.

6. A lock as in claim 2 in which said actuating means comprises a lever pivoted to said housing and extending across the rear face thereof into engagement with said bolt, and a throw member actuated by said key plug and forming a crank engaged with said lever to pivot the same and thereby actuate the bolt, said closure overlying the lever and retaining the same in operating position.

7. A lock as in claim 2 in which said aligned openings in said housing and closure are shaped to receive a retaining lock core, and said blocking element is a lock core inserted therein and having a key-operated retaining lug engageable with a portion of said housing or closure to retain the core in place.

9. A lock as in claim 7 in which said rotatably-engaged retaining means comprises breech locking lugs on said housing and closure, engageable by limited rotation of the closure from an insertion position to a locked position in the housing, said closure having a projection thereon extending into the housing opening which receives the retaining lock core to form a shoulder therein for engagement by said core-retaining lug, said housing opening being shaped to allow entry of said projection into said opening in insertion position of the closure and swinging movement of the projection therein to its operative position upon rotation of the closure to its locked position.

10. A lock as in claim 1 in which the openings, cavity, and chambers in the housing are open to the rear so as to be formed by withdrawable cores, and the housing is formed as a casting.

11. A lock as in claim 9 in which the openings, cavity, and chambers in the housing are open to the rear so as to be formed by withdrawable cores, and the housing is formed as a casting.