Tamper-resistant lock

• US 10,422,165 B2
• Filed: 09/11/2018
• Issued: 09/24/2019
• Est. Priority Date: 06/20/2017
• Status: Active Grant

• Current Assignee: Engbar, Inc.
• Original Assignee: Engbar, Inc.
• Inventors: Engibarov, Eddy, Thomas, Larrie, Denkov, Dontcho
• Primary Examiner(s): Gall, Lloyd A
• Application Number:
  US16/127,428
• Publication Number:
  US 20190017293A1
• Time in Patent Office: 378 Days
• Field of Search: 70 63, 70158-173, 70229-232, 70461, 70403, 70404, 70140, 70DIG 57, 70276, 70413, 8117785, 81442-444, 81446, 81448, 292251, 292252, 292256, 2922565, 292DIG 30, 292340, 292341, 29234118, 29234119, 2922515, 411410, 411910, 411403, 411407, 411104, 411348, 4113725, 4113726, 411271, 411325, 411954, 411 602
• CPC Class Codes: E05B 15/024 adjustable
• CPC Class Codes: E05B 15/10 Bolts of locks or night latches made of hard materials, e.g. to prevent sawing E05B15/1614; lengthwise adjustable E05B63/06
• CPC Class Codes: E05B 17/2088 Means to prevent disengagement of lock and keeper E05B63/12 takes precedence
• CPC Class Codes: E05B 35/008 for simple tool-like keys
• CPC Class Codes: E05B 47/0045 keys with permanent magnets E05B47/0043, E05B47/0044, E05B73/0052 take precedence
• CPC Class Codes: E05B 65/0089 for utility meters or the like
• CPC Class Codes: E05B 67/063 Padlocks with removable shackles
• CPC Class Codes: E05B 67/24 with built- in cylinder locks
• CPC Class Codes: E05C 5/04 performing both movements simultaneously, e.g. screwing into a keeper

Abstract

A locking system includes a tamper-resistant lock and key. The tamper-resistant lock includes a cylindrical lock body with external threading on at least a portion thereof and a bore extending into an end of the cylindrical lock body. The bore includes an engagement feature disposed on the wall that defines the bore, and the engagement feature is disposed a particular distance away from the bore opening. The key includes a collar that has a cylindrical key body that fits within the bore of the cylindrical lock body. The cylindrical key body also includes an opening defined by the collar sidewall, a retractable engagement member at least partially disposed within the opening, a spring disposed within the collar, and a plunger disposed within the collar that is operable to engage the spring and has a recess sized and shaped to accommodate the retractable engagement member.

Claims

1. A locking system, comprising:

a tamper-resistant lock, comprising;

a cylindrical lock body having external threading on at least a portion of a length of the cylindrical lock body;

a bore extending into an end of the cylindrical lock body, the bore having an engagement feature disposed on a wall defining the bore, the engagement feature being disposed a particular distance away from an opening of the bore; and

a bore cap sized and shaped to fit within and occlude the opening of the bore, the bore cap comprising an arcuate head having a flat, continuously smooth top surface and a beveled edge,

wherein at least the arcuate head of the bore cap is made of a ferrous material; and

a key operable for use with the tamper-resistant lock, comprising;

a collar having a cylindrical key body sized and shaped to be at least partially disposed within the bore;

an opening defined by a sidewall of the collar;

a retractable engagement member at least partially disposed within the opening defined by the sidewall of the collar;

a spring disposed within the collar;

a plunger extending from a proximal end to a distal end, the distal end disposed within the collar and interfacing with the spring and having a recess that is sized and shaped to accommodate the retractable engagement member; and

a magnet disposed at the proximal end of the plunger and operable to engage the arcuate head of the bore cap such that a magnetic force between the magnet and the arcuate head of the bore cap is greater than a resistive force retaining the bore cap in association with the cylindrical lock body.

2. The locking system as in claim 1, wherein a cross-section of the opening of the bore forms an uninterrupted circle.

3. The locking system as in claim 1, wherein the engagement feature comprises an elongate ridge extending into the wall defining the bore, the elongate ridge sized and shaped to receive the retractable engagement member.

4. The locking system as in claim 1, further comprising a lock anchor for selectively securing the lock to an anchoring member.

5. The locking system as in claim 4, wherein the lock anchor comprises an attachment mechanism that selectively couples the cylindrical lock body to the anchoring member.

6. The locking system as in claim 5, wherein the attachment mechanism comprises a bolt or a screw that extends through an aperture defined by a bottom of the cylindrical lock body to threadedly engage the anchoring member, wherein a head of the bolt or screw biases the cylindrical lock body toward the anchoring member as the bolt or screw threadedly engages the anchoring member, and wherein the bolt or screw prevents one or more of a lateral, a vertical, or a rotational movement of the cylindrical lock body when the bolt or screw threadedly engages the anchoring member.

7. The locking system as in claim 5, further comprising a second key for selectively coupling the cylindrical lock body to the anchoring member via the attachment mechanism, the second key comprising:

a bit sized and shaped to manipulate the attachment mechanism; and

a guide coupled to the bit, the guide sized and shaped to fit at least partially within the bore.

8. The locking system as in claim 4, wherein the bore cap comprises:

a stem coupled to the head and sized and shaped to fit within the bore; and

a sealing member disposed on the stem that selectively engages the wall defining the bore when the stem is disposed therein.

9. The locking system as in claim 8, wherein the sealing member is disposed on the stem at a predefined position, the predefined position being located above the engagement feature when the bore cap is secured within the opening of the bore.

10. The locking system as in claim 1, wherein the collar of the key comprises a flange.

11. The locking system as in claim 10, wherein the flange is positioned on the cylindrical key body such that a first length-between a distal end of the collar and the flange—

is less than a second length-between the opening of the bore and a surface defining a floor of the bore—

such that when the collar is disposed within the bore, the flange contacts the cylindrical lock body before the distal end of the collar contacts the surface defining the floor of the bore.

12. The locking system as in claim 1, wherein the recess in the plunger comprises an annular channel.

13. The locking system as in claim 1, wherein the bore includes a second engagement feature, and wherein the key includes a second retractable engagement member at least partially disposed within a second opening defined by the sidewall of the collar, the second retractable engagement member being positioned such that it engages the second engagement feature when the retractable engagement member engages the engagement feature.

14. A locking system, comprising:

a housing comprising an anchoring member and a lid;

a tamper-resistant lock for securing the lid to the anchoring member, the tamper-resistant lock comprising;

a cylindrical lock body having external threading on at least a portion of a length of the cylindrical lock body, wherein the portion of the cylindrical lock body passes through the lid and is selectively received within the anchoring member; and

a bore extending into an end of the cylindrical lock body, the bore having an engagement feature disposed on a wall defining the bore, the engagement feature being disposed a particular distance away from an opening of the bore; and

a bore cap sized and shaped to fit within and occlude the opening of the bore, the bore cap comprising an arcuate head having a flat, continuously smooth top surface and a beveled edge, wherein the beveled edge is recessed below a surface of the lid, and wherein at least the arcuate head of the bore cap is made of a ferrous material; and

a key, comprising;

a collar having a cylindrical key body sized and shaped to be at least partially disposed within the bore;

an opening defined by a sidewall of the collar;

a retractable engagement member at least partially disposed within the opening;

a spring disposed within the collar;

a plunger extending from a proximal end to a distal end, the distal end disposed within the collar and interfacing with the spring and having a recess that is sized and shaped to accommodate the retractable engagement member; and

a magnet disposed at the proximal end of the plunger and operable to engage the arcuate head of the bore cap such that a magnetic force between the magnet and the arcuate head of the bore cap is greater than a resistive force retaining the bore cap in association with the cylindrical lock body.

15. The locking system of claim 14, wherein the beveled edge of the bore cap is recessed below a surface of the lid.

16. The locking system of claim 15, wherein the beveled edge of the bore cap abuts a sidewall of the lid defining a recess in the lid into which the bore cap is recessed below the surface of the lid.

17. The locking system of claim 14, wherein the flat, continuously smooth top surface is co-planar with a surface of the lid when the bore cap is associated with the bore of the cylindrical lock body and the tamper-resistant lock is securing the lid to the anchoring member.

18. The locking system of claim 14, further comprising a lock anchor for selectively securing the cylindrical lock body to the anchoring member.

19. The locking system of claim 18, wherein the lock anchor comprises a bolt or a screw that extends through an aperture defined by a bottom of the cylindrical lock body to threadedly engage the anchoring member, wherein a head of the bolt or screw biases the cylindrical lock body toward the anchoring member as the bolt or screw threadedly engages the anchoring member, and wherein the bolt or screw prevents one or more of a lateral, a vertical, or a rotational movement of the cylindrical lock body when the bolt or screw threadedly engages the anchoring member.