Editing Oki Tactile Gourd Spring

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{{Infobox dswitch
| image name        = OETG-ActuationDiagram.png
| manufacturer      = [[Oki Electric]]
| inventor          = Kazuo Aoki<br/>Toshimi Chiba<br/>Sadao Tachibana<br/>Yasushi Nagatomo
| switch type       = [[Switch terminology#Clicky Switch|Clicky]]
| contact mechanism = Spring over [[Contact mechanism#Membrane|membrane]]
| product code      = 
| lifetime          = 
| force graph name  = OETG-ForceGraph.png
| peak force        = 70 cN
| patents           = [http://www.google.com/patents/US4927990 US4927990]
}}

==History==
Developed by [[Oki Electric]] in the late 1980's as an extension to the [[Oki Gourd Spring]] switch to provide audible and tactile feedback. It's important to note that the patent directly references the IBM Model M switch tech, the [[IBM buckling spring]] (including cut-away actuation diagrams and a force curve).

These switches are only found in keyboards that were manufactured by [[Oki Electric]], sometimes as OEM for other companies. Some electric typewriters made by [[Oki Electric]] might also have Oki Gourd Spring switches.

The term "Gourd Spring" seems to have originated from MouseFan of the Japanese keyboard community.<ref name="MouseFan" />

==Key feel==
Smooth barrel with an audible and tactile instant before the spring fully depresses on the sense membrane.

==Keycaps==
All known keycaps are dye sublimated.

==Availability==
It is unlikely that Oki Electric still produces these switches, and since they are not available as single units, the entire keyboard has to be formed. Known keyboards are from the early 1990's.

==Keyboards==
*[[Oki HMB-35957-14]] (internal module is HMB-35957U-22)
*[https://deskthority.net/keyboards-f2/oki-hmb-35957u-22-oki-tactile-gourd-spring-t15051.html Oki HMB-35957U-22]
*[[IBM KMB88102]] (internal module is HMB-35957U-22)

==Gallery==
<gallery widths=250 heights=187>
File:Oki HMB-35957-14 -- gourd springs.jpg            | Tactile gourd springs
</gallery>

==References==
<references>
<ref name="MouseFan">MouseFan — [http://mousefan.telcontar.net/image/OKI2260.htm Reference to "Gourd Spring" on the OKI GA2260] (Japanese) Retrieved 2015-07-31.</ref>
</references>

[[Category:Oki switches]]
[[Category:Clicky switches]]
[[Category:Membrane switches]]
[[Category:Tactile switches]]
[[Category:List of all keyboard switches]]