Folder lock question

S

sam7

Joined
Feb 25, 2000
Messages
6
I'm new to the forum and this is my first posting. I've made a few folders this past year and have come upon an area I'm not sure of and need some help.
In building a frame lock folder with a curved handle, must the 2-2.5" cut determining the lock be a straight line and must it be parallel to the blade axis? And, must the lock-up that engages the tang be perpendicular to that same blade axis?
In advance, THANKS.
 
Welcome to the forums Sam! Excellent question! I wouldn't think the cut would have to be straight but the end of the lock tab probably needs to be close to perpendicular to the line of the blade for the most strength. I'm sure you'll get a better answer from some of the more experienced folks here.

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I finished designing (and started making) one today where the lock follows the downward curve...the trick (the way I see it anyway) is to ensure that you can still draw an imaginary line parallel to the blade axis so that it falls completely on the lock. In other, less baffling, words I reckon so long as part of the lock is acting directly against the tendency for the blade to close, you're laughing. Am I wrong?
 
The axis of the FUNCTIONAL Center line of the knife blade in the open position is very important.
The axis of the pivot, and center line of the knife pivot in relation to 90 degrees can be anything you want it to be by rotation. There are several factors that go into making the best lock up it can be. Its easy on a knife that has a functional axis of 90 degrees TIP CENTER TYPE BLADE straight out the knife (straightish handle).
The trick comes in when you have a curved body and a curved blade. The lock angle in relation the back of the blade in relation to the pivot can be cut wrong. There is an optimal point (angle) that the lock on the back of the blade should be cut at. This is not the LOCKING angle (where the bar hits) but the axis of the blade tang itself.

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[This message has been edited by Darrel Ralph (edited 05-16-2001).]
 

Michael, Ferret, Kevin & Darrell:

Thanks for your quick replies...
There is no problem in maintaining a lock-up of 90 degrees to blade axis, since the blade is relatively straight. With the handle being curved, I was looking for an asthetic lock-line, since it will show. I've seen locksprings that were curved but I question their strength. I think I will go with the straight line. Besides, my small cut-off wheel doesn't like to deviate much from the straight and narrow.
 
I'd like to see a zigzag cut in the lockspring while still maintaining the proper relation to the blade. It could be cool design feature but might be hard to cut into the frame. I almost said "impossible" but almost nothing in the world of folders is impossible it seems!
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Peter Atwood

email: fountainman@hotmail.com
 
No worries
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It'll be a couple of weeks away (with the real job and 2 other folders in front) but I'll try and remember to let you know how it goes with the curvy lock thing
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Opps, I meant to start a new subject.

I ordered some parts from Rick Hinderer back on the 3rd. I've tried to reach him several time at RHind64@aol.com. Does anyone have a new email address?

Thanks

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A.T.
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[This message has been edited by A T Barr (edited 05-18-2001).]
 
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