retractable pen structure

detailed explanation of retractable pen

1. Design project Prepared and submitted by, NAIR POOJA POORNESWERY .M S5IT , LBSITW ROLLNO-28 1

2. 2 RETRACTABLE PEN

3. INTRO O O O …. 3 Retractable pens  are pens which have a spring-loaded ink cartridge which retracts and extends outside a protective housing. By clicking downward on the top of the pen, the tip is extended

4. The Evolution ….. 4 1950….

5. BUT WHY THIS DESIGN ??? 5 The basic idea is to get rid of the cap used in other pen

6. DIFFERENT TYPE OF CLICK PEN 6

7. LIFE STORY… The origin of the retractable pen is controversial. The Frawley Pen Company, claims to have made the "first pen with a retractable ballpoint tip " in 1950.  Pilot Pen from Japan was introduced as the first retractable fountain pen , and remains a popular product in the Pilot- Namiki line. 7

8. CELLS OF CLICK PEN … 8

9. At top there are 3 main components. 1.Upper Cam ( simply cam ) 2.Lower Cam (follower ) 3.Push rod(user hand) The cam is always attached to the top . The follower can be fixed on the refill itself . The push rod is attached to the top button which you press while clicking.  9 PARTS OF CLICK PEN

10. Cam  - The white dot, shows the direction of the nib. Cam is a simple part in a mechanical linkage that helps in providing reciprocating motion to the follower (in this case). 10

11. 11 The follower looks like this - This can be attached to the top of a refill . The third component which the push rod, which is connected to the clicker on one end . This pushes the follower.

12. 12 The   measurements taken into consideration  when designing compression springs :-   Outer Diameter - A ble to fit inside the pen’s “barrel” or “tube ”. Inner Diameter - It is also placed over a shaft. The spring mustn’t be either too tight or too loose around this shaft. Free Length - The free length determines how long your spring will be when unloaded .

13. While the truth is …………. Much of the work happens mostly at the top. The spring just stores the energy we provide through our clicks and puts a constant upward load on the refill. 13

14. IS THERE ANY SCIENCE BEHIND CLICK PEN…????? The fundamental mechanism used in pens is a 'Trigger Mechanism' (Holding back large forces and releasing them suddenly), 14

15. working See the nib of the pen while clicking. The follower takes five distinct position in the entire cycle.  Position 1 - Nib is inside. Position 2 - Nib comes out to maximum. (1st click sound) Position 3 - Nib   then goes back a bit and then remains out. (2nd Click sound) Position 4 - On clicking again, Nib goes to Position 2 (3rd Click sound) Position 5 - Nib goes inside (4th Click sound) 15

16. 16

17. Explanation:- The numbers marked shows the corresponding position of the follower with respect to the nib position 17

18. At 1 - the follower is completely inside. When you make your first click, the follower moves over to position 2 and then  falls  to position 3. This is because the spring is constantly applying the upward force Now the nib is in position 3. After you click again, it reaches position 4 (Maximum) and then again falls to position 5 since spring forces it to go back. (Nib closed) 18

19. 19

20. The function of the spring is to  force  the follower to follow the cam profile strictly ,The plane of the push rod prevents the follower from falling completely . The fourth click sound ( after it falls in position 5) is the loudest of all. 20

21. 21

22. 22

23. Purpose of retractable pen Ease of Use Time Saver Safety Comfort 23

24. Different designs of click pen 24 But the desire of innovation never stopped ……….. Rather it just begin…………..

25. 25 Robert Morrison innovation created a beautiful innvention ………… The Klick Stylus Pen allows users to transition seamlessly from digital to analog with a single “ Klick ,” providing a smooth ballpoint pen tip for writing on paper, which then retracts directly through the capacitive stylus tip for resuming touch screen use.

26. 26

27. 27

28. IT’S JUST A BEGINNING … 28

29. Thank you 29