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Ball Point Pen Type Mechanism

10/02/2011 7:37 PM

Does anyone know what the mechinism used in a retractable ball point pen is called?

"You push the button down, the pen tip extends. Then when you push the button down again, the pen tip retracts."

I need same but bigger version.

Can anyone help?

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#1

Re: Ball Point Pen Type Mechanism

10/02/2011 8:19 PM

I don't know if it has a specific name, but I think generally it could be called a 'ratchet and barrel retraction mechanism'.

Do a web search and see what you get.

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#2

Re: Ball Point Pen Type Mechanism

10/02/2011 8:46 PM

"spring loaded" afaik.

spring plungers, ball-spring plungers, may be what you're looking for. or maybe spring stop button?

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#5
In reply to #2

Re: Ball Point Pen Type Mechanism

10/03/2011 9:23 AM

isn't Afaik what that white duck says on TV. You know, the duck that is always near someone with a broken leg.

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#6
In reply to #5

Re: Ball Point Pen Type Mechanism

10/03/2011 9:48 AM

No, that would be AFLAC

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#8
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Re: Ball Point Pen Type Mechanism

10/03/2011 12:22 PM

It stands for as-far-as-I-know, afaik.

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#32
In reply to #8

Re: Ball Point Pen Type Mechanism

10/04/2011 9:43 PM

r u shur?

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#3

Re: Ball Point Pen Type Mechanism

10/02/2011 8:47 PM

You might get help with a call to Customer Service at http://www.mcmaster.com or http://www.mscdirect.com. If you want very many of them I suggest using the proper term for the part at Google and at http://www.globalspec.com .

Bruce

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#4

Re: Ball Point Pen Type Mechanism

10/03/2011 3:43 AM

Hi J2,

I think it might be called a "latching push button".

Best of luck with your search,

John

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#7

Re: Ball Point Pen Type Mechanism

10/03/2011 10:30 AM

On the big side. Have a look for Heppenstall material handling. They do a similar thing for automatic cane handling systems.

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#9

Re: Ball Point Pen Type Mechanism

10/03/2011 1:47 PM

Here are some class/subclass definitions in Class 401 from the US Patent Office's Manual of Classification, which may help get you started with nomenclature. I am not clear what you are using this for, and I recommend that you search the Manual of Classification for that use. For pens, I think (guess) you are in subclasses 103 and 109 of class 401:

http://www.uspto.gov/web/patents/classification/shadowFiles/defs401sf.htm?401_103&S&2R&2V#2V

http://www.uspto.gov/web/patents/classification/shadowFiles/defs401sf.htm?401_109&S&2R&31#31

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#10
In reply to #9

Re: Ball Point Pen Type Mechanism

10/03/2011 2:21 PM

By using the extending tip, i am hoping to put a break/lock on the spools in my spool box that I designed to retract some cables.

space and distance i am dealing with is 3-8 cm long and 1-2cm in diameter. .....and of course the break/lock will be on when the apparatus is not in use & rotating.

Altough there are many ways to do that, push on/off button for locking seemed attractive and less hassles....if i cant find it [which it seems to be the case so far]...then the next best thing would be for me to design push and twist knob for extension and untwist for retraction.

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#20
In reply to #10

Re: Ball Point Pen Type Mechanism

10/03/2011 11:38 PM

Does it need to have its own self-latching device or could you use on of these where it locks on your shaft end under spring load and freewheels when depressed.

It may need to be beefed up from the model which picks up 3mm screws and things but would the mechanism suit the need ?

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#11

Re: Ball Point Pen Type Mechanism

10/03/2011 3:12 PM

Would something like this work? With maybe a longer threaded piece for the lock?

$8 from 3 stores Grizzly G1772 Clamp Down Type Quick Release Toggle Clamp - 3 x 3 You +1'd this publicly. Undo Grizzly G1772 Clamp Down Type Quick Release Toggle Clamp - 3 x 3 : These quick-action toggle clamps are extremely useful for bench-mounted jigs ...

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#12
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Re: Ball Point Pen Type Mechanism

10/03/2011 6:00 PM

I want this! Never seen it before, thanks.

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#13
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Re: Ball Point Pen Type Mechanism

10/03/2011 6:04 PM

Be forewarned! You will smash your thumb when you first try to release it when it's tight. I have, more than once. The clampming part folds back all the way to the handle, firmly trapping your thumb.

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#14
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Re: Ball Point Pen Type Mechanism

10/03/2011 6:17 PM

I much appreciate that warning! Similar things have been known to happen. Makes you happy to know that, scientifically speaking, swearing relieves pain (thank $#@%!).

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#37
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Re: Ball Point Pen Type Mechanism

10/06/2011 6:52 AM

LOL!! We have some here, on jigs and rigs...good for location locking. I inherited one on a rig which is used to depress a trolley mounted foot pedal. (No, I don't know the logic!)

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#43
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Re: Ball Point Pen Type Mechanism

10/06/2011 6:18 PM

In my opinion you can never have too many clamps. A well designed clamp is a thing of beauty.

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#31
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Re: Ball Point Pen Type Mechanism

10/04/2011 5:58 PM

these are also known as over center clamps

there's also a version that pulls that is real handy

I have 1/2 a mind to announce this to everyone who posted to this thread via PM

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#38
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Re: Ball Point Pen Type Mechanism

10/06/2011 6:54 AM

We are well aware you have 1/2 a mind.

[You asked for that one ;o)]

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#40
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Re: Ball Point Pen Type Mechanism

10/06/2011 8:20 AM
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#15

Re: Ball Point Pen Type Mechanism

10/03/2011 10:24 PM

It's a retractable ball point pen mechanism.

Same as a light dimmer switch.

Same as the button on my car radio that locks in the channel.

Same as the button that turns my toaster on...

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#16

Re: Ball Point Pen Type Mechanism

10/03/2011 10:40 PM

They call it a retraction mechanism, and there are quite a few of them

lots of pictures

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#17

Re: Ball Point Pen Type Mechanism

10/03/2011 10:57 PM

The mechanism used in a retractable ball-point pen is called an "Alternate Push Rocking Latch Mechanism for Ball Point Pen."

http://www.freepatentsonline.com/2930354.html

The old floor-mounted dimmer switch was called a "push-push latching switch".

The word, "latch" should probably occur somewhere in your description.

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#18
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Re: Ball Point Pen Type Mechanism

10/03/2011 11:01 PM

they are also called "alternate action" mechanisms

Alternate action

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#19

Re: Ball Point Pen Type Mechanism

10/03/2011 11:12 PM

you need the mechanism made famous by PARKER pen makers . . . as you make the first push, a quarter turn rotation takes place to slide the cam and lock it till you push again and unlock it to release and retract over the next quarter turn . . .

the same mechanism is also used in most brands of push-push on-off switch buttons for starting and stopping of appliances electrically . . . TEKNIC is one of the brands that is very popular and it works very well . . .

. . . for some useless trivia you may also see - http://en.wikipedia.org/wiki/Jotter . . .

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#21
In reply to #19

Re: Ball Point Pen Type Mechanism

10/03/2011 11:50 PM

Thanks Soebfatahi,...thanks guys, I am still searching,....I have called McMasters, Mscdirect,....Globalspec...and few others, they all understood what i am looking for but they dont have it,......does anyone know who makes them or sales them? [of course not including pen manufacturers]

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#22
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Re: Ball Point Pen Type Mechanism

10/04/2011 12:15 AM

i am not sure whether CR4 will approve my pasting a name and address . . . i know that this company makes standard products and also tailors specific custom built products for specific needs of customers . . . sorry if this reads like an advertisement - but i guess you are looking for a solution provider . . . DISCLAIMER - whereas i know the company and have used their services satisfactorily, i have no commercial interest whatsoever in sharing their name . . .

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#23

Re: Ball Point Pen Type Mechanism

10/04/2011 5:44 AM

You almost said it yourself, they are also called push on/push off mechanisms

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#24

Re: Ball Point Pen Type Mechanism

10/04/2011 6:21 AM

Hi again j2,

Looking more closely at a ball point pen operation the function doesn't look suitable as a clamping device. The pen fully extends and then drops back to lock and to retract it fully extends again before it retracts so it might not be the operation you seek.

I was thinking that a shaft going through a washer with a spring holding the washer at an angle. Pushing the rod will slide through the washer but stopping pushing the shaft will lock. Lifting the washer square with the shaft and it will release the shaft and it can be pulled back.

I know what I mean but have doubts about my description being clear. If you chjeck out the SMC Pneumatics web site look at the locking head cylinders information. There are 2 types one is a collet gripping the rod but the other type has the "canted washer principle" and it will all become clear.

Best regards,

John

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#25
In reply to #24

Re: Ball Point Pen Type Mechanism

10/04/2011 6:40 AM

I believe this is the same as a skeleton gun mechanism.-the guns used by 'skilled tradesmen' to bodge mastic around the massive gaps their skill has left

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http://images.toolbank.com/images/full/FAIMG.jpg

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#26
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Re: Ball Point Pen Type Mechanism

10/04/2011 7:25 AM

It is called a (spring actuated) compressive latch and release mechanism.

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#28
In reply to #25

Re: Ball Point Pen Type Mechanism

10/04/2011 10:33 AM

Hi cnc Jim,

Exactly, I forgot about the humble Mastic Gun. It should work just fine.

John

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#39
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Re: Ball Point Pen Type Mechanism

10/06/2011 6:59 AM

It is still further out in the "on" position that in the "off". So it could be used for the spool lock mechanism, as long as the final extension is long/strong enough to prevent rotation, this is set by the depth of the return rebates on the "drive drum", and the holes into which the rods extend are deep enough to take the full range of motion.

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#27

Re: Ball Point Pen Type Mechanism

10/04/2011 10:30 AM

Try this site for compression latches http://www.southco.com/product/default.aspx?hid=7315 these may get you on the right road.

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#29

Re: Ball Point Pen Type Mechanism

10/04/2011 1:03 PM

A larger version of the same thing is a common cabinet latch........sometimes referred to as a magnetic release latch.

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#33
In reply to #29

Re: Ball Point Pen Type Mechanism

10/05/2011 8:18 PM

Thanks Duckinthepond, i know about the cabinet latch you are talking about, I bought one last week, same concept as ballpoint pen mecanism, in fact same mecanism, except this one is designed to extend upwards rather then from the buttom. so unfortunatly it is not going to work.

Anyway,....i dont beleive anybody manufactures this type of mecanism except the plastic pen manufacturers,.....so I decided to design a spring loaded push in T knob with twist to lock in place, and twist back to release and retract.

And yes Jesw55 you are right about "The pen fully extends and then drops back to lock" ,..i had taken that into condediration when designing the size of the locking male teeth which would accept full extension before drop back and still remain locked on the receiving female teeth situated on spool shaft.

And LYN thanks for the photo and suggestion but this item is too big and rough looking for the small and delicate spool box in question.

Its all good,...thanks to all of you.

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#34
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Re: Ball Point Pen Type Mechanism

10/05/2011 9:30 PM

It would be interesting to know what you intend to apply this mechanism to.

The crowd here is anything butt when it comes to nosy, but, having said that, free advice with a lot of moxy is generally given. especially when they get their 02 cylinders recharged..............

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#35
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Re: Ball Point Pen Type Mechanism

10/05/2011 10:34 PM

if it is not too much trouble and if it is not a business secret . . . please share a picture or a drawing of what you finally do . . . we love to learn . . .

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#30

Re: Ball Point Pen Type Mechanism

10/04/2011 4:45 PM

Did you try flip-flop mechamisms?

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#36
In reply to #30

Re: Ball Point Pen Type Mechanism

10/05/2011 10:53 PM

Ferquiza, i tried but no luck,...have you seen a flip-flop mecanism that is 3-10 cm long and that when pressed it extends like the ballpoint pen does for 8-12mm,....? if "yes" ..let us know where.

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#41

Re: Ball Point Pen Type Mechanism

10/06/2011 9:42 AM

Believe the basic mechanism is a pawl and ratchet - the spring simply resets the push button (pawl) for another stroke. If spring is gone, you can manually pull button out and push it down again, would work to move the ratchet around to next notch in the 'wheel'. The ratchet is set to alternate the total length of the ink tube with a simple plastic end cap mated to the ratchet.

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#42

Re: Ball Point Pen Type Mechanism

10/06/2011 10:53 AM

I've always called it a "thing-a-ma-jig".

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#44

Re: Ball Point Pen Type Mechanism

10/08/2011 2:40 PM

It's called mechanical toggle or toggle push button.

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