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Recent content by dteich

  1. dteich

    Need a torsion spring 100 NM at 45 degrees

    The spring is a non-critical component, in a typical outdoor environment. Not corrosive, just -20C to +70C It will not be an issue of the torque changes 10%. The spring will see no action except when the barrier that it drives is attacked.
  2. dteich

    Need a torsion spring 100 NM at 45 degrees

    Lets start with a 90 degree limit. If this is a problem, lets start with 45 deg and then I can see if I can double up.
  3. dteich

    Need a torsion spring 100 NM at 45 degrees

    yes you are right. I need the 100 NM torque. Any solutions?
  4. dteich

    Need a torsion spring 100 NM at 45 degrees

    ... as far s the torque at 120 degrees, I think that you mean that the torque will be 26.7NM. Right? If so, that is indeed my expectation.
  5. dteich

    Need a torsion spring 100 NM at 45 degrees

    Hi Israel, We will need a few hundred in the first year, then hopefully more. It is a volume, low cost product. Does the quantity affect the conceptual solution?
  6. dteich

    Need a torsion spring 100 NM at 45 degrees

    Application is to protect an installation from abuse. The driveshaft will be connected to the external arm through a torsion spring. At 45 deg rotation of the arm we need at least 100 NM resistance. It would be great if we could allow 120 degrees arm rotation without killing the spring, at...
  7. dteich

    433 MHz flat antenna design

    Hi Guys -- Thanks for the compliments on the product. The planar antenna that we use works well -- Kevin did a super job. Dori
  8. dteich

    U Clip Stress Analysis

    Thanks to all so much. Your help and support are greatly appreciated. Dori
  9. dteich

    U Clip Stress Analysis

    Hi desertfox, Thanks for the excellent analysis. It is clear to me, at long last, that the clip just can not offer the forces that I need. I am looking at a torsion solution. Can you recommend any reasonable (free is very reasonable) software/calculator that provide the angular rotation of a...
  10. dteich

    U Clip Stress Analysis

    We designed a U clip 0.87" long, 0.62" wide and 0.62 high, made of 0.060" spring steel. The force the clip needs to work under (and yield to) is up to 1,000 lbs. at its tips (the two tips get compressed together half way with a 0.25" metal in the middle of the U preventing it from overtravel)...
  11. dteich

    433 MHz flat antenna design

    V1BLL -- I AM in the Garage door business, and we get 300 feet open air using a 1/4" whip with a -105db receiver. You are right -- the antenna stinks. So... what can you suggest? dori@dp-corp.com
  12. dteich

    433 MHz flat antenna design

    Thanks guys for the fast response. The range requirement is 25 feet from inside the car. That cuts 6 to 10 db off the power, so we are now in the 45-80 feet line of sight range. Any closer and you can not see the barrier over the nose of your car. We can not put out a vertical antenna due to...
  13. dteich

    433 MHz flat antenna design

    Our product (www.designatedparking.com) is a 20" aluminum partially spherical housing 3" tall with a 4" plastic canopy under which the antenna lies. We use a spiral antenna with estimated gain of -14dbD, and the range is only 40 feet with a -112 db receiver. We need at least twice that range...
  14. dteich

    Barrier adhesion to asphalt and concrete

    We need to glue a base of a barrier device for parking spaces, for applications where anchors are not allowed. The barrier yields after 200 lb. is applied horizontally at a height of 15" from the ground. If curious, the application can be seen on www.dp-corp.com. Any suggestions as to...
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