CA2214699A1 - Armored anti-theft device - Google Patents
Armored anti-theft device Download PDFInfo
- Publication number
- CA2214699A1 CA2214699A1 CA 2214699 CA2214699A CA2214699A1 CA 2214699 A1 CA2214699 A1 CA 2214699A1 CA 2214699 CA2214699 CA 2214699 CA 2214699 A CA2214699 A CA 2214699A CA 2214699 A1 CA2214699 A1 CA 2214699A1
- Authority
- CA
- Canada
- Prior art keywords
- frame
- lock
- theft device
- housing
- outer housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B9/00—Lock casings or latch-mechanism casings ; Fastening locks or fasteners or parts thereof to the wing
- E05B9/08—Fastening locks or fasteners or parts thereof, e.g. the casings of latch-bolt locks or cylinder locks to the wing
- E05B9/084—Fastening of lock cylinders, plugs or cores
- E05B9/086—Fastening of rotors, plugs or cores to an outer stator
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
- E05B15/16—Use of special materials for parts of locks
- E05B15/1614—Use of special materials for parts of locks of hard materials, to prevent drilling
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B19/00—Keys; Accessories therefor
- E05B19/0017—Key profiles
- E05B19/0041—Key profiles characterized by the cross-section of the key blade in a plane perpendicular to the longitudinal axis of the key
- E05B19/0047—Key profiles characterized by the cross-section of the key blade in a plane perpendicular to the longitudinal axis of the key with substantially circular or star-shape cross-section
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B73/00—Devices for locking portable objects against unauthorised removal; Miscellaneous locking devices
- E05B73/0082—Devices for locking portable objects against unauthorised removal; Miscellaneous locking devices for office machines, e.g. PC's, portable computers, typewriters, calculators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Burglar Alarm Systems (AREA)
Abstract
An anti-theft device for securing an apparatus comprises of a frame dimensioned to fit over the apparatus, anchoring means to anchor the device to an adjacent support, and a double-locking system. The frame has an openable side that permits removal and insertion of the apparatus and allows the apparatus to be locked in once it has been inserted into the frame. The double-locking system has a first lock mounted on the frame that locks the openable side in a closed position, a security housing affixed to the frame that encloses the first lock, an outer housing that can be removably positioned to enclose the shielded housing and a second lock affixed to the outer housing that locks the outer housing to the frame when the outer housing encloses the security housing.
Description
ARMORED ANTI~ DEVICE
FIELD OF THE lNV~N~lION
The present invention relates to anti-theft devices. In particular, the invention relates to anti-theft devices for computer towers and computer peripherals such as a printer.
BACKGROUND OF THE l~v~N~lION
There are many approaches to preventing the theft of computer towers. One such approach involves gluing the base of the tower to the surface of a desk or a table with polyurethane glue. However, the computer chips which are the most valuable commodity can be removed simply by removing the top of the case. Furthermore, servicing and upgrading the computer is inconvenient since the base must be removed and then re-glued. Another approach involves the use of cables affixed to the tower and locked to a bracket on a desk or the floor. Cables are not an effective deterrent to theft since they can be easily cut with a bolt cutter. Other anti-theft approaches consist of putting the computer tower in a solid box or cabinet. However, with this approach, there is a danger of the computer being overheated and destroyed.
Furthermore, access to the computer is restricted because of lack of space. Another anti-theft device on the market consists of a wire cage enclosing the tower and affixed to the floor. Such a cage can be easily removed with a pair of bolt cutters.
U.S. Pat. No. 5,642,634, issued to Perry, discloses a device that uses cables as a means of securing the computer.
U.S. Pat. No. 5052199, issued to Derman, discloses a clamp device for securing the housing of computers and similar equipment to a desk. U.S. Pat. No. 4,656,848, issued to Rose, discloses a security device for a personal computer which consists of projecting bolts that hold the cabinet of the current IBM PC models to prevent removal of its slide-out chassis. U.S. Pat. No. 4,453,692, issued to LeDoux, discloses a security device which includes a desk top for supporting the article, a frame structure fitted over and around the article, anchor studs to anchor the frame to the supporting structure, and padlocks for each anchor stud. U.S.
Pat. No. 5,162,976, issued to Moore et al., discloses a security device for a portable computer with a double housing structure.
It is the object of the invention to provide an improved anti-theft securing device that overcomes these limitations.
SUMMARY OF THE lNv~NllON
According to the invention, there is provided an anti-theft device for securing an apparatus comprising of a frame that is dimensioned to fit over the apparatus to be secured. The frame has an openable side that can be moved from an open position to a closed position. This side permits the removal and insertion of the apparatus and allows the apparatus to be locked in once it has been inserted into the frame. The anti-theft device also has anchoring means to S anchor the device to an adjacent support. A double-locking system affixed to the frame locks the openable side when this side is in the closed position. The double-locking system comprises of a first lock mounted on the frame that can lock the openable side when it is in the closed position, a security housing also mounted on the frame which encloses the first lock, an outer housing that can be removably positioned so as to enclose the security housing, and a second lock affixed to the outer housing that locks the outer housing to the frame when the outer housing encloses the frame.
Preferably, the anchoring means comprises of anchor bolts that fasten the base of the frame to an adjacent support.
Preferably, the frame is constructed from a hardenable steel metal alloy. The hardenable steel alloy has the following properties:
a) a core srinell Hardness (Hs) in a range of HB 580 to HB 634 (Rockwell hardness (HRC) 54 to HRC 59) b) a case hardness in a range of HB 634 to HB 666 (HRC 59 to HRC 62) c) a case depth of a minimum 0.060 inches.
The anti-theft device may include a shield for covering a front side of the apparatus. The shield may have a latchable lock that can lock the shield to the frame.
s The apparatus to be secured by the anti-theft device may be a computer tower.
The openable side of the anti-theft device may include a pivotal arm that is pivotally attached to the frame at one end. The security housing may be mounted on this pivotal arm. An extension lug may be mounted on the frame and may be inserted in a slot present in the shielded housing, thereby coupling the openable side to the frame. The extension lug may have a lock opening such that a padlock can pass through the opening, locking the openable side to the frame when the extension lug has been inserted into the shielded housing.
The outer housing may have a push-button lock. A bracket with an opening that engages the locking pin of this push-button lock may be present in the openable side.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed to characterize the invention are set forth in the appended claims. The invention, itself, however, as well as other features and advantages thereof, will be best understood by reference to the detailed description which follows, read in conjunction with the accompanying drawings, wherein:
S Fig. 1 is a front view of an unlocked anti-theft device for a computer tower;
Fig. 2 is a top view of the locked double locking system;
Fig. 3 is a cut side view of the locked double locking system;
Fig. 4 is a side view of the locked anti-theft device;
Fig. Sa is a rear view of the shield; and, Fig. 5b is a rear view of the anti-theft device with an attached shield;
Fig. 6 is a list of all the steel alloy grades and their elemental compositions that can be used in the manufacture of the anti-theft device.
DETAILED DESCRIPTION WITH REFERENCE TO THE FIGURES
Referring to Fig. 1, there is shown an anti-theft device for a computer tower consisting of a frame 10 in the shape of a rectangular cube. The base 12 of the frame 10 is in the form of a metal strip in the shape of an "I" with a portion bent to form a front guard strip 36 and another portion bent to form a rear guard strip 34, both guard strips 34 and 36 being perpendicular to the base 12. An upper edge of rear guard strip 34 has a central indent. The middle section 14 of the "I" has two pairs of holes 16, one pair at each end.
The holes 16 are used for inserting anchor bolts into a supporting structure such as a desk top, table top or a floor, thus securing the metal frame to the supporting structure so that it cannot be easily removed. A front side 32 and rear side 30 of the frame 10 are manufactured from rods that are each bent into U-shaped frame sections 13 and 11, respectively. Front frame section 13 has two side rods 18 and 20 connected by a top rod 44. Rear frame section 11 has two side rods 22 and 24 connected by a top rod 42. The bottom of each side rod 18, 20, 22, 24 is positioned at the remote corners of the "I/'. One of the front side rods 20 of the frame 10 has a stop 26 positioned approximately midway on the front rod 20. The rear side rod 22 has an extension 28 that juts outwardly from the frame 10 and contains a hole 29 through which a padlock arm (not shown) can be inserted.
On the front side 32 of the frame 10 front guard strip 36 is welded to the bottom portions of the front side rods 18, 20 connecting the rods together. On the rear side 30 of the frame 10, each end of the rear guard strip 34 of the base 12 i~ welded to the bottom portions of rear side rods 22 and 24 connecting the rods together. Along the length of the frame 10, metal right angles 50 and 52 interconnect side rods 20 and 22 and side rods 18 and 24, respectively.
For greater strength, the two elongated metal plates 60 and 62 extend along the length of frame 10 parallel to right angles 50 and 52, midway along each of side rods 20 and 22 and side rods 18 and 24, respectively. Elongated metal plate 62 is welded to both side rods 18 and 24. Sleeve 64 of elongated metal plate 60 is rotatably coupled to side rod 20 and is supported by stop 26 affixed to side rod 20. The movable elongated plate 60 has a small rectangular housing 66 an end opposite to the stop 26. In addition, a bracket 68 which extends out perpendicularly from elongated metal plate 60 a short distance away from the housing 66 has a hole 93 through which a locking pin 92 (not shown) is removably inserted.
Referring to Figs. 2 and 3, which show the locking mechanism, the small housing 66 has a slot 84 on the moveable metal plate side through which the extension 28 jutting from side rod 22 can be inserted. The four other sides of the housing 66 are also composed of solid metal with the exception of the bottom side which is open. A padlock 90 can be inserted into the housing 66 through the bottom side. The arm of the padlock 90 is inserted into a hole 29 in the extension 28 after the extension 28 has been inserted into the housing 66 through the slot 84. The padlock is then S locked. The small housing 66 is dimensioned so that the bottom of the locked padlock 90 is level with the bottom of the housing 66.
The second locking system consists of a push button lock 73 in a large housing 71. The housing 71 is also of a rectangular shape. The side facing the moveable metal plate 60 is open. The housing 71 is dimensioned such that it is placeable over the small housing 66 and the bracket 68. The housing 71 has an extension 88 that is slipped around the lS back metal rod section 22 fastening the housing 71 to the frame 10. The housing also has a divider 96 to which push-button lock 73 (manufactured by Abloy, Montreal, Canada) is fastened by means of screws 97. The locking pin 92 of the push-button lock 73 is inserted into hole 93 in the bracket 68 when the push-button 95 is pushed. A second extension 94 on the housing 71 abuts the moveable metal plate 60 when the housing 71 is positioned for locking. Since padlock 90 is shielded with housings 66 and 71, it is inaccessible once the locking pin 92 is inserted into hole 93.
The push button lock 73 has a ring locking structure (not shown). The key has notches that engage to the corresponding notches in the rings of the ring locking structure. These rings are hard to duplicate making it harder for a thief to S use a master key to unlock the frame 10.
Referring to Figure 4, the anti-theft device has rod sections 70 welded to the inner side of the metal right angles 50 and 52 to further strengthen the frame 10.
Referring to Figure 5a and 5b, the anti-theft device may have a shield 72 at the front side 32 of the frame 10. The shield 72 is wider than the front side 32 of the frame 10 but the length of the shield 72 is smaller than the length of the front side 32. The shield 72 has a peripheral lip metal 74 extending perpendicularly to the plane of shield 72 on the long sides and on the upper short side thereof, allowing the shield 72 to fit snugly around the front side 32 of the frame 10. An extension 76 juts out from the bottom portion of the shield 72 and allows the shield 72 to clamp onto the back guard strip 36 and enclose side rods 18, 20 and 44.
The shield 72 also has holes 78 in the bottom portion for movement of air and heat. A lock 80 with a latch 82 is present on the top side of the shield 72. During a locking operation, the latch 82 is moved 90 degrees against the top rod 44, holding the shield 72 securely against the frame 10.
To lock a computer tower, the moveable metal band 60 is opened and the computer tower positioned into the frame.
Double-locking frame 10 involves the movement of the moveable S metal band 60 towards the frame 10 resulting in the insertion of the extension 28 on the side rod 22 into the slot 84 in the small housing 66. The padlock 90 is slipped through the bottom opening 86 of the small housing 66 and the arm of the padlock is inserted into the hole 29 in the extension 28 and the padlock 90 is snapped shut. Then, the extension 88 of the large housing 71 is slipped around the rod 22 and the large housing 71 is moved over the small housing 66 such that a roof 89 of the large housing 71 is proximate the small housing 66 and the large housing 71 abuts the moveable metal plate 60. The push-button 95 is pushed in resulting in the insertion of the locking pin 92 into the hole 93 in the bracket 68 on the moveable metal plate 60, locking the large housing 71 to the frame 10. The shield 72 may then be positioned on the front side of the frame 10 and clamped onto the front guard strip 36 to prevent access to the disc drive or an on/off switch. The latch 82 may then be moved locking the shield 72 to the top rod 44 of the frame 10.
25The quality of metal used to construct the frame 10 is very important. The metal must be sufficiently hard so that it is not able to be cut with standard cutting devices but at the same time sufficiently malleable to allow forming the device. In this embodiment, a steel metal alloy with carbon, chromium, manganese, nickel and molybdenum as minor elements is used to manufacture U-shaped frame sections 13 and 11 of the frame 10 and the rod sections 70. A list of grades of the steel metal alloy (purchased from British Steel Alloys, Delta, British Columbia) that may be used for manufacture of the frame and their elemental composition, aside from iron, are shown in Figure 6. All domestic and international equivalents to these grades from other suppliers may be used in the manufacture of the device. All other parts may be fabricated from standard steel as in this embodiment or from the steel metal alloy used for the manufacture of U-shaped frame sections 13 and 11 of the frame 10 and the rod sections 70.
The steel-metal alloy is drawn from 5/8 inch round bars into 1/2 inch round bars and shaped into the appropriate forming. Then the formings are cut to the required size and then sand blasted with fine grit. Depending on the grade of steel metal alloy used, the formings are heat treated. The formings may be carburized, annealed, austenized, normalized, or quenched and tempered to yield a device having the following properties:
a) a core Brinell Hardness in a range of HB 580 to HB
634 and a core Rockwell Hardness in a range of HRC 54 to HRC
59;
b) a case Brinell Hardness in a range of HB 634 to HB
666 and a case Rockwell Hardness in a range of HRC 59 to HRC
62;
c) a case depth of a minimum 0.060 inches; and, 4) a Charpy V-Notch factor of 15 ft-lbs/min. at -50~F.
Generally, the formings are subjected to carburization at 325~C so that the atomic carbon infuses into the metal. This is followed by annealing and then quenching the formings to a temperature below 50~C. Lastly, the formings are tempered at approximately 135~C.
After the heat treatment, the formings and other parts of the frame 10 are welded into place and the frame 10 is powder coated. Lastly, the push-button lock 72 is screwed onto the divider 96 of the large housing 71.
Although the above discussion describes an anti-theft device for a computer tower, similar devices with the appropriate change in the dimensions can be constructed for easily removable computer peripherals such as printers, and even for expensive electronic equipment such as sound systems.
Examples of hardening the steel metal alloy:
1. The formings are constructed from bars and rods of AISI
8620 grade steel alloy (purchased from British Steel Alloys).
The formings are quenched directly from the oven, then carburized at 925~C for 8 hours, followed by a quenching in agitated oil. Subsequently, the formings are tempered at 150~C.
FIELD OF THE lNV~N~lION
The present invention relates to anti-theft devices. In particular, the invention relates to anti-theft devices for computer towers and computer peripherals such as a printer.
BACKGROUND OF THE l~v~N~lION
There are many approaches to preventing the theft of computer towers. One such approach involves gluing the base of the tower to the surface of a desk or a table with polyurethane glue. However, the computer chips which are the most valuable commodity can be removed simply by removing the top of the case. Furthermore, servicing and upgrading the computer is inconvenient since the base must be removed and then re-glued. Another approach involves the use of cables affixed to the tower and locked to a bracket on a desk or the floor. Cables are not an effective deterrent to theft since they can be easily cut with a bolt cutter. Other anti-theft approaches consist of putting the computer tower in a solid box or cabinet. However, with this approach, there is a danger of the computer being overheated and destroyed.
Furthermore, access to the computer is restricted because of lack of space. Another anti-theft device on the market consists of a wire cage enclosing the tower and affixed to the floor. Such a cage can be easily removed with a pair of bolt cutters.
U.S. Pat. No. 5,642,634, issued to Perry, discloses a device that uses cables as a means of securing the computer.
U.S. Pat. No. 5052199, issued to Derman, discloses a clamp device for securing the housing of computers and similar equipment to a desk. U.S. Pat. No. 4,656,848, issued to Rose, discloses a security device for a personal computer which consists of projecting bolts that hold the cabinet of the current IBM PC models to prevent removal of its slide-out chassis. U.S. Pat. No. 4,453,692, issued to LeDoux, discloses a security device which includes a desk top for supporting the article, a frame structure fitted over and around the article, anchor studs to anchor the frame to the supporting structure, and padlocks for each anchor stud. U.S.
Pat. No. 5,162,976, issued to Moore et al., discloses a security device for a portable computer with a double housing structure.
It is the object of the invention to provide an improved anti-theft securing device that overcomes these limitations.
SUMMARY OF THE lNv~NllON
According to the invention, there is provided an anti-theft device for securing an apparatus comprising of a frame that is dimensioned to fit over the apparatus to be secured. The frame has an openable side that can be moved from an open position to a closed position. This side permits the removal and insertion of the apparatus and allows the apparatus to be locked in once it has been inserted into the frame. The anti-theft device also has anchoring means to S anchor the device to an adjacent support. A double-locking system affixed to the frame locks the openable side when this side is in the closed position. The double-locking system comprises of a first lock mounted on the frame that can lock the openable side when it is in the closed position, a security housing also mounted on the frame which encloses the first lock, an outer housing that can be removably positioned so as to enclose the security housing, and a second lock affixed to the outer housing that locks the outer housing to the frame when the outer housing encloses the frame.
Preferably, the anchoring means comprises of anchor bolts that fasten the base of the frame to an adjacent support.
Preferably, the frame is constructed from a hardenable steel metal alloy. The hardenable steel alloy has the following properties:
a) a core srinell Hardness (Hs) in a range of HB 580 to HB 634 (Rockwell hardness (HRC) 54 to HRC 59) b) a case hardness in a range of HB 634 to HB 666 (HRC 59 to HRC 62) c) a case depth of a minimum 0.060 inches.
The anti-theft device may include a shield for covering a front side of the apparatus. The shield may have a latchable lock that can lock the shield to the frame.
s The apparatus to be secured by the anti-theft device may be a computer tower.
The openable side of the anti-theft device may include a pivotal arm that is pivotally attached to the frame at one end. The security housing may be mounted on this pivotal arm. An extension lug may be mounted on the frame and may be inserted in a slot present in the shielded housing, thereby coupling the openable side to the frame. The extension lug may have a lock opening such that a padlock can pass through the opening, locking the openable side to the frame when the extension lug has been inserted into the shielded housing.
The outer housing may have a push-button lock. A bracket with an opening that engages the locking pin of this push-button lock may be present in the openable side.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed to characterize the invention are set forth in the appended claims. The invention, itself, however, as well as other features and advantages thereof, will be best understood by reference to the detailed description which follows, read in conjunction with the accompanying drawings, wherein:
S Fig. 1 is a front view of an unlocked anti-theft device for a computer tower;
Fig. 2 is a top view of the locked double locking system;
Fig. 3 is a cut side view of the locked double locking system;
Fig. 4 is a side view of the locked anti-theft device;
Fig. Sa is a rear view of the shield; and, Fig. 5b is a rear view of the anti-theft device with an attached shield;
Fig. 6 is a list of all the steel alloy grades and their elemental compositions that can be used in the manufacture of the anti-theft device.
DETAILED DESCRIPTION WITH REFERENCE TO THE FIGURES
Referring to Fig. 1, there is shown an anti-theft device for a computer tower consisting of a frame 10 in the shape of a rectangular cube. The base 12 of the frame 10 is in the form of a metal strip in the shape of an "I" with a portion bent to form a front guard strip 36 and another portion bent to form a rear guard strip 34, both guard strips 34 and 36 being perpendicular to the base 12. An upper edge of rear guard strip 34 has a central indent. The middle section 14 of the "I" has two pairs of holes 16, one pair at each end.
The holes 16 are used for inserting anchor bolts into a supporting structure such as a desk top, table top or a floor, thus securing the metal frame to the supporting structure so that it cannot be easily removed. A front side 32 and rear side 30 of the frame 10 are manufactured from rods that are each bent into U-shaped frame sections 13 and 11, respectively. Front frame section 13 has two side rods 18 and 20 connected by a top rod 44. Rear frame section 11 has two side rods 22 and 24 connected by a top rod 42. The bottom of each side rod 18, 20, 22, 24 is positioned at the remote corners of the "I/'. One of the front side rods 20 of the frame 10 has a stop 26 positioned approximately midway on the front rod 20. The rear side rod 22 has an extension 28 that juts outwardly from the frame 10 and contains a hole 29 through which a padlock arm (not shown) can be inserted.
On the front side 32 of the frame 10 front guard strip 36 is welded to the bottom portions of the front side rods 18, 20 connecting the rods together. On the rear side 30 of the frame 10, each end of the rear guard strip 34 of the base 12 i~ welded to the bottom portions of rear side rods 22 and 24 connecting the rods together. Along the length of the frame 10, metal right angles 50 and 52 interconnect side rods 20 and 22 and side rods 18 and 24, respectively.
For greater strength, the two elongated metal plates 60 and 62 extend along the length of frame 10 parallel to right angles 50 and 52, midway along each of side rods 20 and 22 and side rods 18 and 24, respectively. Elongated metal plate 62 is welded to both side rods 18 and 24. Sleeve 64 of elongated metal plate 60 is rotatably coupled to side rod 20 and is supported by stop 26 affixed to side rod 20. The movable elongated plate 60 has a small rectangular housing 66 an end opposite to the stop 26. In addition, a bracket 68 which extends out perpendicularly from elongated metal plate 60 a short distance away from the housing 66 has a hole 93 through which a locking pin 92 (not shown) is removably inserted.
Referring to Figs. 2 and 3, which show the locking mechanism, the small housing 66 has a slot 84 on the moveable metal plate side through which the extension 28 jutting from side rod 22 can be inserted. The four other sides of the housing 66 are also composed of solid metal with the exception of the bottom side which is open. A padlock 90 can be inserted into the housing 66 through the bottom side. The arm of the padlock 90 is inserted into a hole 29 in the extension 28 after the extension 28 has been inserted into the housing 66 through the slot 84. The padlock is then S locked. The small housing 66 is dimensioned so that the bottom of the locked padlock 90 is level with the bottom of the housing 66.
The second locking system consists of a push button lock 73 in a large housing 71. The housing 71 is also of a rectangular shape. The side facing the moveable metal plate 60 is open. The housing 71 is dimensioned such that it is placeable over the small housing 66 and the bracket 68. The housing 71 has an extension 88 that is slipped around the lS back metal rod section 22 fastening the housing 71 to the frame 10. The housing also has a divider 96 to which push-button lock 73 (manufactured by Abloy, Montreal, Canada) is fastened by means of screws 97. The locking pin 92 of the push-button lock 73 is inserted into hole 93 in the bracket 68 when the push-button 95 is pushed. A second extension 94 on the housing 71 abuts the moveable metal plate 60 when the housing 71 is positioned for locking. Since padlock 90 is shielded with housings 66 and 71, it is inaccessible once the locking pin 92 is inserted into hole 93.
The push button lock 73 has a ring locking structure (not shown). The key has notches that engage to the corresponding notches in the rings of the ring locking structure. These rings are hard to duplicate making it harder for a thief to S use a master key to unlock the frame 10.
Referring to Figure 4, the anti-theft device has rod sections 70 welded to the inner side of the metal right angles 50 and 52 to further strengthen the frame 10.
Referring to Figure 5a and 5b, the anti-theft device may have a shield 72 at the front side 32 of the frame 10. The shield 72 is wider than the front side 32 of the frame 10 but the length of the shield 72 is smaller than the length of the front side 32. The shield 72 has a peripheral lip metal 74 extending perpendicularly to the plane of shield 72 on the long sides and on the upper short side thereof, allowing the shield 72 to fit snugly around the front side 32 of the frame 10. An extension 76 juts out from the bottom portion of the shield 72 and allows the shield 72 to clamp onto the back guard strip 36 and enclose side rods 18, 20 and 44.
The shield 72 also has holes 78 in the bottom portion for movement of air and heat. A lock 80 with a latch 82 is present on the top side of the shield 72. During a locking operation, the latch 82 is moved 90 degrees against the top rod 44, holding the shield 72 securely against the frame 10.
To lock a computer tower, the moveable metal band 60 is opened and the computer tower positioned into the frame.
Double-locking frame 10 involves the movement of the moveable S metal band 60 towards the frame 10 resulting in the insertion of the extension 28 on the side rod 22 into the slot 84 in the small housing 66. The padlock 90 is slipped through the bottom opening 86 of the small housing 66 and the arm of the padlock is inserted into the hole 29 in the extension 28 and the padlock 90 is snapped shut. Then, the extension 88 of the large housing 71 is slipped around the rod 22 and the large housing 71 is moved over the small housing 66 such that a roof 89 of the large housing 71 is proximate the small housing 66 and the large housing 71 abuts the moveable metal plate 60. The push-button 95 is pushed in resulting in the insertion of the locking pin 92 into the hole 93 in the bracket 68 on the moveable metal plate 60, locking the large housing 71 to the frame 10. The shield 72 may then be positioned on the front side of the frame 10 and clamped onto the front guard strip 36 to prevent access to the disc drive or an on/off switch. The latch 82 may then be moved locking the shield 72 to the top rod 44 of the frame 10.
25The quality of metal used to construct the frame 10 is very important. The metal must be sufficiently hard so that it is not able to be cut with standard cutting devices but at the same time sufficiently malleable to allow forming the device. In this embodiment, a steel metal alloy with carbon, chromium, manganese, nickel and molybdenum as minor elements is used to manufacture U-shaped frame sections 13 and 11 of the frame 10 and the rod sections 70. A list of grades of the steel metal alloy (purchased from British Steel Alloys, Delta, British Columbia) that may be used for manufacture of the frame and their elemental composition, aside from iron, are shown in Figure 6. All domestic and international equivalents to these grades from other suppliers may be used in the manufacture of the device. All other parts may be fabricated from standard steel as in this embodiment or from the steel metal alloy used for the manufacture of U-shaped frame sections 13 and 11 of the frame 10 and the rod sections 70.
The steel-metal alloy is drawn from 5/8 inch round bars into 1/2 inch round bars and shaped into the appropriate forming. Then the formings are cut to the required size and then sand blasted with fine grit. Depending on the grade of steel metal alloy used, the formings are heat treated. The formings may be carburized, annealed, austenized, normalized, or quenched and tempered to yield a device having the following properties:
a) a core Brinell Hardness in a range of HB 580 to HB
634 and a core Rockwell Hardness in a range of HRC 54 to HRC
59;
b) a case Brinell Hardness in a range of HB 634 to HB
666 and a case Rockwell Hardness in a range of HRC 59 to HRC
62;
c) a case depth of a minimum 0.060 inches; and, 4) a Charpy V-Notch factor of 15 ft-lbs/min. at -50~F.
Generally, the formings are subjected to carburization at 325~C so that the atomic carbon infuses into the metal. This is followed by annealing and then quenching the formings to a temperature below 50~C. Lastly, the formings are tempered at approximately 135~C.
After the heat treatment, the formings and other parts of the frame 10 are welded into place and the frame 10 is powder coated. Lastly, the push-button lock 72 is screwed onto the divider 96 of the large housing 71.
Although the above discussion describes an anti-theft device for a computer tower, similar devices with the appropriate change in the dimensions can be constructed for easily removable computer peripherals such as printers, and even for expensive electronic equipment such as sound systems.
Examples of hardening the steel metal alloy:
1. The formings are constructed from bars and rods of AISI
8620 grade steel alloy (purchased from British Steel Alloys).
The formings are quenched directly from the oven, then carburized at 925~C for 8 hours, followed by a quenching in agitated oil. Subsequently, the formings are tempered at 150~C.
2. The formings were constructed from bars and rods of AISI
E9310 grade steel alloy (purchased from British Steel Alloys). The formings were quenched directly from the oven, then carburized at 925~C for 8 hours, followed by a quenching in agitated oil. Subsequently, the formings were tempered at 150~C.
The formings were austenitized at 850~C-870~C, then air cooled or oil quenched. Subsequently, the formings were tempered at 220~C-250~C
E9310 grade steel alloy (purchased from British Steel Alloys). The formings were quenched directly from the oven, then carburized at 925~C for 8 hours, followed by a quenching in agitated oil. Subsequently, the formings were tempered at 150~C.
The formings were austenitized at 850~C-870~C, then air cooled or oil quenched. Subsequently, the formings were tempered at 220~C-250~C
Claims (13)
1. An anti-theft device for securing an apparatus comprising:
a) a frame dimensioned to fit over said apparatus, said frame having an openable side moveable between open and closed positions to permit removal and insertion of said apparatus and to lock in said apparatus when it has been inserted;
b) anchoring means for anchoring said device to an adjacent support;
c) a double locking system affixed to said frame operative to lock said openable side in the closed position, said double locking system including:
(i) a first lock mounted on said frame operative to lock said openable side in the closed position, (ii) a security housing affixed to said frame enclosing said first lock, (iii) an outer housing removably positionable to enclose said shielded housing, and (iv) a second lock affixed to said outer housing and operative to lock said outer housing to said frame when said outer housing encloses said security housing.
a) a frame dimensioned to fit over said apparatus, said frame having an openable side moveable between open and closed positions to permit removal and insertion of said apparatus and to lock in said apparatus when it has been inserted;
b) anchoring means for anchoring said device to an adjacent support;
c) a double locking system affixed to said frame operative to lock said openable side in the closed position, said double locking system including:
(i) a first lock mounted on said frame operative to lock said openable side in the closed position, (ii) a security housing affixed to said frame enclosing said first lock, (iii) an outer housing removably positionable to enclose said shielded housing, and (iv) a second lock affixed to said outer housing and operative to lock said outer housing to said frame when said outer housing encloses said security housing.
2. An anti-theft device according to claim 1, wherein said anchoring means comprises of anchor bolts fastening a base of said frame to the adjacent support.
3. An anti-theft device according to claim 1, wherein at least a portion of said frame is constructed from a hardenable steel metal alloy.
4. An anti-theft device according to claim 3, wherein said steel metal alloy is hardened so that it has the following properties:
a) a core Brinell Hardness in a range of HB 580 to HB
634 and a core Rockwell Hardness in a range of HRC 54 to HRC
59;
b) a case Brinell Hardness in a range of HB 634 to HB
666 and a case Rockwell Hardness in a range of HRC 59 to HRC
62; and, c) a case depth of a minimum 0.060 inches.
a) a core Brinell Hardness in a range of HB 580 to HB
634 and a core Rockwell Hardness in a range of HRC 54 to HRC
59;
b) a case Brinell Hardness in a range of HB 634 to HB
666 and a case Rockwell Hardness in a range of HRC 59 to HRC
62; and, c) a case depth of a minimum 0.060 inches.
5. An anti-theft device according to claim 1, including a shield for covering a front side of the apparatus, said shield having a latchable lock operative to lock said shield to said frame.
6. An anti-theft device according to claim 1, wherein said apparatus is a computer tower.
7. An anti-theft device according to claim 1, wherein said openable side includes a pivotal arm pivotally attached to said frame at one end.
8. An anti-theft device according to claim 7, wherein said security housing is mounted on the pivotal arm.
9. An anti-theft device according to claim 8, including an extension lug mounted on said frame and insertable in a slot in said security housing coupling said openable side to said frame.
10. An anti-theft device according to claim 9, wherein the extension lug has a lock opening such that a padlock passes through the lock opening to lock said openable side to said frame when the extension lug has been inserted in the slot in said security housing.
11. An anti-theft device according to claim 1, wherein said outer housing includes a push-button lock.
12. An anti-theft device according to claim 11, including a bracket on said openable side, said bracket having an opening engageable with a locking pin of the push button lock.
13. An anti-theft device according to claim 1 wherein said frame is reinforced with strips of metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2214699 CA2214699A1 (en) | 1997-05-13 | 1997-09-04 | Armored anti-theft device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2205133 CA2205133A1 (en) | 1997-05-13 | 1997-05-13 | An armored anti-theft computer tower restraint with a shielded double-locking mechanism; plus server shield |
| CA2205133 | 1997-05-13 | ||
| CA 2214699 CA2214699A1 (en) | 1997-05-13 | 1997-09-04 | Armored anti-theft device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2214699A1 true CA2214699A1 (en) | 1998-11-13 |
Family
ID=25679324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2214699 Abandoned CA2214699A1 (en) | 1997-05-13 | 1997-09-04 | Armored anti-theft device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2214699A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7029133B2 (en) | 2004-06-29 | 2006-04-18 | Hard Steal Security Corp. | Adjustable security enclosure |
-
1997
- 1997-09-04 CA CA 2214699 patent/CA2214699A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7029133B2 (en) | 2004-06-29 | 2006-04-18 | Hard Steal Security Corp. | Adjustable security enclosure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |