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Another Japanese point lock

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Another Japanese point lock

Unread postby MDickinson » Wed Mar 14, 2012 6:50 pm

Found these pictures, saying that, I found the one with the hand lever in it first, and took me a lot of pondering to work out how it worked! I assumed the stretcher bar the hand lever rod is connected to was a normal solid bar, and could not see how the closed switch rail was released.
Following the discovery of the other diagrams, it all becomes clear.

Image

Image

Image

Any stretcher bar fitted has elongated slots in it, as shown in the technical diagram with the point machine operation, to allow the switch rails to move independently from each other. Of course one photo shows no such stretcher fitted.
The lock box in the 4ft (3 and 1/2ft? :lol: ) has a spring inside to help hold the switch rail closed in either position.

Seems to be along the same lines as many points on the continent with independent switches, such as those using clawlocks etc.

Once again a very ingenious device to an age old problem.

Mike.
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Re: Another Japanese point lock

Unread postby John Webb » Thu Mar 15, 2012 10:46 am

The Japanese 'over-centre spring' arrangement seems remarkably similar to the system used on many model railway points, albeit on a larger scale.
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Re: Another Japanese point lock

Unread postby Is Line Clear » Thu Mar 15, 2012 11:56 pm

John Webb wrote:The Japanese 'over-centre spring' arrangement seems remarkably similar to the system used on many model railway points, albeit on a larger scale.

But if it works safely.......

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Re: Another Japanese point lock

Unread postby MRFS » Fri Mar 16, 2012 12:05 am

Jersey_Mike wrote:That seems to be horribly over-engineered compared to the manual switch stands we have over here in North America. I'm still trying to figure out why certain countries put so much effort into point locking on hand throw switches. What does this design achieve over something like this?


Bothways locking, for a start. (Based on your linked photograph)
ND: Why is there a door handle on the inside of my airing cupboard?
MF: Because it's the fire exit from Narnia.

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Re: Another Japanese point lock

Unread postby Peter Jordan » Fri Mar 16, 2012 6:34 am

And, presumably, trailable without damage (as in the model railway example) ?

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Re: Another Japanese point lock

Unread postby MRFS » Fri Mar 16, 2012 11:49 am

Jersey_Mike wrote:
Bothways locking, for a start. (Based on your linked photograph)


Can you explain that concept?


Er... A facing point lock for both directions through the switch.
ND: Why is there a door handle on the inside of my airing cupboard?
MF: Because it's the fire exit from Narnia.

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Re: Another Japanese point lock

Unread postby S&TEngineer » Fri Mar 16, 2012 12:43 pm

Looking at the photograph and drawing a little bit more are those plunger type electrical detectors attached to the stock rails?
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Re: Another Japanese point lock

Unread postby Danny252 » Fri Mar 16, 2012 3:06 pm

Jersey_Mike wrote:
Er... A facing point lock for both directions through the switch.


Why does one need a facing point lock is there is no attached lever frame requiring mechanical point detection?


Because this sort of thing is quite expensive to clean up: http://www.youtube.com/watch?v=03Nq632eV6I
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Re: Another Japanese point lock

Unread postby MRFS » Fri Mar 16, 2012 5:15 pm

Danny252 wrote:
Jersey_Mike wrote:
Er... A facing point lock for both directions through the switch.


Why does one need a facing point lock is there is no attached lever frame requiring mechanical point detection?


Because this sort of thing is quite expensive to clean up: http://www.youtube.com/watch?v=03Nq632eV6I



Oops.
ND: Why is there a door handle on the inside of my airing cupboard?
MF: Because it's the fire exit from Narnia.

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Re: Another Japanese point lock

Unread postby MDickinson » Sun Mar 18, 2012 5:06 pm

Chris Bellett wrote:Looking at the photograph and drawing a little bit more are those plunger type electrical detectors attached to the stock rails?


Certainly looks like it, and seems quite a neat design. However, if anyone thought about bringing them over here they will probably be looked at in horror by the railway inspectorate, the age old 'not designed in the UK' mentality again! :roll:

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Re: Another Japanese point lock

Unread postby Coli.Hill » Sat May 28, 2016 7:22 pm

Once again a very ingenious device to an age old problem.
Mike.



Hello Mike, I am interested in tracking down the Japanese patent for this point lock, mainly to find out if the patent is still valid since I'd like to use this clever little device on my own railway. The engineering drawing you showed is actually a patent drawing, can you remember where you found it? A link or patent number would be ever so useful.
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Re: Another Japanese point lock

Unread postby hmmueller » Wed Jun 1, 2016 6:15 pm

Whoops - a patent on such a well-known device? Elbow levers to press point blades to stock rails have been in use for at least 130 years (Jüdel and Büssing built and sold such blade locks in the southern German countries and in Switzerland in huge numbers). Adding a spring to keep the lever on one side has certainly also been tried over the centuries. Besides, as long as you just use it on your own installation and don't try to sell it, no-one will spend money (on an attorney) to send you a desist order or the like ...

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