Corbin Emhart - Revision history

Mgsecure: /* Principles of operation */

2023-08-11T13:14:47Z

Principles of operation

← Older revision		Revision as of 13:14, 11 August 2023
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	File:Corbin_Emhart_plug.jpg \| Pins properly aligned at the [[shear line]].		File:Corbin_Emhart_plug.jpg \| Pins properly aligned at the [[shear line]].
	File:Corbin_Emhart_plug_pins.jpg \| The grooved [[plug]] holds driver pins when rotated.		File:Corbin_Emhart_plug_pins.jpg \| The grooved [[plug]] holds driver pins when rotated.
			File:Corbin Russwin Emhart - gigawalt - 2 cutaway.jpg \| Cutaway by l0ckcr4ck3r
			File:Corbin Russwin Emhart - gigawalt - 3 cutaway.jpg \| Cutaway by l0ckcr4ck3r
			File:Corbin Russwin Emhart - gigawalt - 4 cutaway.jpg \| Cutaway by l0ckcr4ck3r
			File:Corbin Russwin Emhart - gigawalt - 5 cutaway.jpg \| Cutaway by l0ckcr4ck3r
	</gallery></div>		</gallery></div>

Sandplum: added note regarding pin length

2022-09-26T20:14:49Z

added note regarding pin length

← Older revision		Revision as of 20:14, 26 September 2022
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	\| maker = [[Corbin Russwin]]		\| maker = [[Corbin Russwin]]
	\| lock_type = [[Cylinder]]		\| lock_type = [[Cylinder]]
	\| lock_design = [[Pin-tumbler]]		\| lock_design = [[Pin_tumbler\|Pin-tumbler]]
	\| patent = [https://patents.google.com/patent/US4098103A/ US 4,098,103]<br>[https://patents.google.com/patent/US4103526A US 4,103,526]<br>[https://patents.google.com/patent/US4208894A/ US 4,208,894]		\| patent = [https://patents.google.com/patent/US4098103A/ US 4,098,103]<br>[https://patents.google.com/patent/US4103526A US 4,103,526]<br>[https://patents.google.com/patent/US4208894A/ US 4,208,894]
	\| years_produced = 1978 - Present		\| years_produced = 1978 - Present
	}}		}}

	The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.		The '''Emhart''' is a [[UL 437]] rated [[Pin_tumbler\|pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.

	The Emhart is still produced but only existing systems are supported. Corbin Russwin lost a case filed by [[Medeco]] in 1975 which claimed the Emhart design, particularly the use of axial rotation, infringed upon Medeco's patents. The case was settled in 1977 and forced Corbin Russwin to pay Medeco royalties on each Emhart sold until March of 1987.		The Emhart is still produced but only existing systems are supported. Corbin Russwin lost a case filed by [[Medeco]] in 1975 which claimed the Emhart design, particularly the use of axial rotation, infringed upon Medeco's patents. The case was settled in 1977 and forced Corbin Russwin to pay Medeco royalties on each Emhart sold until March of 1987.
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	== Principles of operation ==		== Principles of operation ==

	The Emhart is a [[pin-tumbler]] lock that uses six pin stacks. The driver pins of the Emhart have a T shaped protrusion, with a matching gap on the top of the key pins. These two points interlock, requiring that pins move together until they are disconnected. When pin stacks are properly raised and rotated, movement of the plug causes the pin stacks to disconnect, trapping each driver pin above the [[shear line]]. Driver pins maintain their position by being trapped in grooves around the plug. These grooves double as protection against various forms of [[destructive entry]], as well. The key contains cuts that mirror the grooves in the plug, allowing the plug to rotate completely while keeping the driver pins in the proper position.		The Emhart is a [[Pin_tumbler\|pin-tumbler]] lock that uses six pin stacks. The driver pins of the Emhart have a T shaped protrusion, with a matching gap on the top of the key pins. These two points interlock, requiring that pins move together until they are disconnected. When pin stacks are properly raised and rotated, movement of the plug causes the pin stacks to disconnect, trapping each driver pin above the [[shear line]]. Driver pins maintain their position by being trapped in grooves around the plug. These grooves double as protection against various forms of [[destructive entry]], as well. The key contains cuts that mirror the grooves in the plug, allowing the plug to rotate completely while keeping the driver pins in the proper position.

	The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide [[axial rotation]] which is necessary to properly rotate the pin stacks.		The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide [[axial rotation]] which is necessary to properly rotate the pin stacks.
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	* Springs 401F87-7		* Springs 401F87-7
	* Slides 217F44		* Slides 217F44


			The last 3 digits of the part number are the pin length, in thousandths of an inch, including the tab.



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	* [[Corbin Russwin]]		* [[Corbin Russwin]]
	* [[Pin-tumbler]]		* [[Pin_tumbler\|Pin-tumbler]]
	* [[Axial rotation]]		* [[Axial rotation]]

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	[[Category:Lock_models]]		[[Category:Lock_models]]
	[[Category:Pin-tumbler locks]]		[[Category:Pin-tumbler locks]]
			[[Category:High_security_locks]]
			[[Category:UL_437_locks]]
	[[Category:Axial rotation]]		[[Category:Axial rotation]]

Sandplum: added Components section and part numbers for pins, springs, slides

2022-09-26T10:21:05Z

added Components section and part numbers for pins, springs, slides

@@ Line 33: / Line 33: @@
 File:Corbin_Emhart_plug_pins.jpg | The grooved [[plug]] holds driver pins when rotated.
 </gallery></div>
 == Dissassembly instructions ==
@@ Line 74: / Line 108: @@
 [[Category:Corbin Russwin| ]]
 [[Category:Pin-tumbler locks]]
 [[Category:Axial rotation]]

Datagram at 21:40, 3 February 2021

2021-02-03T21:40:05Z

← Older revision		Revision as of 21:40, 3 February 2021
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	\| lock_type = [[Cylinder]]		\| lock_type = [[Cylinder]]
	\| lock_design = [[Pin-tumbler]]		\| lock_design = [[Pin-tumbler]]
	\| patent = [~~http~~://~~www~~.google.com/~~patents?id=gsg4AAAAEBAJ~~ US 4,098,103]<br>[~~http~~://~~www~~.google.com/~~patents?id=Ti8uAAAAEBAJ~~ US 4,103,526]<br>[~~http~~://~~www~~.google.com/~~patents?id=E540AAAAEBAJ~~ US 4,208,894]		\| patent = [https://patents.google.com/patent/US4098103A/ US 4,098,103]<br>[https://patents.google.com/patent/US4103526A US 4,103,526]<br>[https://patents.google.com/patent/US4208894A/ US 4,208,894]
	\| years_produced = 1978 - Present		\| years_produced = 1978 - Present
	}}		}}

Mcm151201: /* Corbin Emhart */

2016-04-30T01:35:40Z

Corbin Emhart

← Older revision		Revision as of 01:35, 30 April 2016
Line 13:		Line 13:
	The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.		The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.

	The Emhart is still produced but only existing systems are supported. Corbin Russwin lost a case filed by [[Medeco]] in 1975 which claimed the Emhart design, particularly the use of axial rotation, infringed upon Medeco's patents. The case was settled in 1977 and forced Corbin Russwin to pay Medeco royalties on each Emhart sold until March of 1987.~~<ref>Myers, Matthew. "Corbin Emhart High Security Locks." The Independent Locksmith Journal 20 (2010). Print.</ref>~~		The Emhart is still produced but only existing systems are supported. Corbin Russwin lost a case filed by [[Medeco]] in 1975 which claimed the Emhart design, particularly the use of axial rotation, infringed upon Medeco's patents. The case was settled in 1977 and forced Corbin Russwin to pay Medeco royalties on each Emhart sold until March of 1987.

	The Emhart has since been superceded by the [[Corbin Russwin Pyramid]].		The Emhart has since been superceded by the [[Corbin Russwin Pyramid]].

Datagram at 16:43, 7 February 2011

2011-02-07T16:43:58Z

← Older revision		Revision as of 16:43, 7 February 2011
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	'''Notes'''		'''Notes'''
	* The Emhart is immune to [[key bumping]] due to the interlocking pins.		* The Emhart is immune to [[key bumping]] due to the interlocking pins.
	* Traditional picking techniques disconnect the pins and leave no easy way to reconnect them, effectively making the lock non-functional. Overcoming this requires that after the plug is rotated to open the lock the key pins can be raised and rotated back to a position where they can re-engage the driver pins.		* Traditional picking techniques disconnect the pins and leave no easy way to reconnect them (unless the lock is mounted vertically up, see [[Talk:Corbin_Emhart\|talk page]]), effectively making the lock non-functional. Overcoming this requires that after the plug is rotated to open the lock the key pins can be raised and rotated back to a position where they can re-engage the driver pins.
	* Certain forms of [[destructive entry]], particularly forced removal of the [[plug]], are much harder due to the design of the interlocking pins and the grooved plug.		* Certain forms of [[destructive entry]], particularly forced removal of the [[plug]], are much harder due to the design of the interlocking pins and the grooved plug.

Datagram at 22:46, 28 January 2011

2011-01-28T22:46:54Z

← Older revision		Revision as of 22:46, 28 January 2011
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	\| lock_type = [[Cylinder]]		\| lock_type = [[Cylinder]]
	\| lock_design = [[Pin-tumbler]]		\| lock_design = [[Pin-tumbler]]
	\| patent = [http://www.google.com/patents?id=~~E540AAAAEBAJ~~ US 4,~~208~~,~~894~~]<br>[http://www.google.com/patents?id=~~gsg4AAAAEBAJ~~ US 4,~~098~~,~~103~~]		\| patent = [http://www.google.com/patents?id=gsg4AAAAEBAJ US 4,098,103]<br>[http://www.google.com/patents?id=Ti8uAAAAEBAJ US 4,103,526]<br>[http://www.google.com/patents?id=E540AAAAEBAJ US 4,208,894]
	\| years_produced = 1978 - Present		\| years_produced = 1978 - Present
	}}		}}

Datagram at 17:06, 22 July 2010

2010-07-22T17:06:36Z

← Older revision		Revision as of 17:06, 22 July 2010
Line 8:		Line 8:
	\| lock_design = [[Pin-tumbler]]		\| lock_design = [[Pin-tumbler]]
	\| patent = [http://www.google.com/patents?id=E540AAAAEBAJ US 4,208,894]<br>[http://www.google.com/patents?id=gsg4AAAAEBAJ US 4,098,103]		\| patent = [http://www.google.com/patents?id=E540AAAAEBAJ US 4,208,894]<br>[http://www.google.com/patents?id=gsg4AAAAEBAJ US 4,098,103]
	\| years_produced = 1978 - ?		\| years_produced = 1978 - Present
	}}		}}

	The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.		The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.

			The Emhart is still produced but only existing systems are supported. Corbin Russwin lost a case filed by [[Medeco]] in 1975 which claimed the Emhart design, particularly the use of axial rotation, infringed upon Medeco's patents. The case was settled in 1977 and forced Corbin Russwin to pay Medeco royalties on each Emhart sold until March of 1987.<ref>Myers, Matthew. "Corbin Emhart High Security Locks." The Independent Locksmith Journal 20 (2010). Print.</ref>

			The Emhart has since been superceded by the [[Corbin Russwin Pyramid]].

	__TOC__		__TOC__
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	The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide [[axial rotation]] which is necessary to properly rotate the pin stacks.		The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide [[axial rotation]] which is necessary to properly rotate the pin stacks.

	The Emhart uses a variable [[MACS]] based on the angle of rotation between pins. Adjacent pins with the same angles use a MACS of 4, adjacent pins with different angles use a MACS of 3.<ref>{{Ref pulford}}</ref>		The Emhart uses a variable [[MACS]] based on the angle of rotation between pins. Adjacent pins with the same angles use a MACS of 4, adjacent pins with different angles use a MACS of 3.<ref>{{Ref pulford}}</ref>

	<div align="center"><gallery>		<div align="center"><gallery>

Datagram: Created page with '=Corbin Emhart = {{Lock model | name = Corbin Emhart | Img = File:Corbin_Emhart_cylinder.jpg | maker = Corbin Russwin | lock_type = Cylinder | lock_design = [[Pin-tumble…'

2010-06-16T16:18:45Z

Created page with '=Corbin Emhart = {{Lock model | name = Corbin Emhart | Img = File:Corbin_Emhart_cylinder.jpg | maker = Corbin Russwin | lock_type = Cylinder | lock_design = [[Pin-tumble…'

New page

=Corbin Emhart =

{{Lock model
| name = Corbin Emhart
| Img = File:Corbin_Emhart_cylinder.jpg
| maker = [[Corbin Russwin]]
| lock_type = [[Cylinder]]
| lock_design = [[Pin-tumbler]]
| patent = [http://www.google.com/patents?id=E540AAAAEBAJ US 4,208,894]<br>[http://www.google.com/patents?id=gsg4AAAAEBAJ US 4,098,103]
| years_produced = 1978 - ?
}}

The '''Emhart''' is a [[UL 437]] rated [[pin-tumbler]] lock made by [[Corbin Russwin]]. The Emhart is best known for having interlocking pins that provide resistance to [[lockpicking]] and make the lock immune to [[key bumping]] attacks. The Emhart is one of the few pin-tumbler locks that uses [[axial rotation]] as one of its key control and pick-resistance features.

__TOC__

== Principles of operation ==

The Emhart is a [[pin-tumbler]] lock that uses six pin stacks. The driver pins of the Emhart have a T shaped protrusion, with a matching gap on the top of the key pins. These two points interlock, requiring that pins move together until they are disconnected. When pin stacks are properly raised and rotated, movement of the plug causes the pin stacks to disconnect, trapping each driver pin above the [[shear line]]. Driver pins maintain their position by being trapped in grooves around the plug. These grooves double as protection against various forms of [[destructive entry]], as well. The key contains cuts that mirror the grooves in the plug, allowing the plug to rotate completely while keeping the driver pins in the proper position.

The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide [[axial rotation]] which is necessary to properly rotate the pin stacks.

The Emhart uses a variable [[MACS]] based on the angle of rotation between pins. Adjacent pins with the same angles use a MACS of 4, adjacent pins with different angles use a MACS of 3.<ref>{{Ref pulford}}</ref>

<div align="center"><gallery>
File:Corbin_Emhart_key.jpg | The Emhart key.
File:Corbin_Emhart_pins.jpg | Interlocking pin stacks.
File:Corbin_Emhart_plug.jpg | Pins properly aligned at the [[shear line]].
File:Corbin_Emhart_plug_pins.jpg | The grooved [[plug]] holds driver pins when rotated.
</gallery></div>

== Dissassembly instructions ==

The Emhart is relatively easy to disassemble, but it cannot be disassembled in as many ways as traditional pin-tumbler locks. Most importantly, the plug cannot be removed with a traditional [[plug follower]] because of the interlocking pins and the ribbed plug. Pin stacks must be installed and removed from the pin chambers only.

# Remove the pin chamber casing and remove the pin stacks.
# Remove the [[cam]] or C-clip.
# Remove the [[plug]].

== Vulnerabilities ==

The Emhart may be vulnerable to one or more of the following:

* [[Lockpicking]]
* [[Impressioning]]
* [[Decoding]]

'''Notes'''
* The Emhart is immune to [[key bumping]] due to the interlocking pins.
* Traditional picking techniques disconnect the pins and leave no easy way to reconnect them, effectively making the lock non-functional. Overcoming this requires that after the plug is rotated to open the lock the key pins can be raised and rotated back to a position where they can re-engage the driver pins.
* Certain forms of [[destructive entry]], particularly forced removal of the [[plug]], are much harder due to the design of the interlocking pins and the grooved plug.

== Gallery ==

<div align="center"><gallery>
File:Corbin_Emhart_key_angles.jpg
File:Corbin_Emhart_pins_all.jpg
File:Corbin_Emhart_plug_solo.jpg
File:Corbin_Emhart_plug_key.jpg
</gallery></div>

== References ==
<references />

== See also ==

* [[Corbin Russwin]]
* [[Pin-tumbler]]
* [[Axial rotation]]

[[Category:Corbin Russwin| ]]
[[Category:Pin-tumbler locks]]
[[Category:Axial rotation]]