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  1. #1
    Join Date
    Feb 2012
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    australia
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    Default Pivot hinges solution

    Hi,
    I am making a table that has 2 triangles top that are connected with a hinges placed on the angles. I am now looking for hinges that could do this movement:
    movement table - YouTube


    I sketched a ideal hinge solution (in the photos). A male, female hinges join by a drop down pin. I don t know where to find something similar on the market. Anyone has a idea, a better solution or know where i could find such hinges?

    To help a bit the top of this table is 20mm thick.

    thanks for your help!

    join.jpgmale.jpgfemale.jpg

  2. #2
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    Apr 2013
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    Karana Downs QLD
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    Default

    G'day Vincente,

    It might help if you could indicate what sort of weight you expect this hinge to support. Getting the hinge (or making it) is probably the easy part of the task - how the hinge is secured to the two table portions will likely dictate how successful the project will be.

    Daryl

  3. #3
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    OK, having thought about it a bit longer now, depending on the shape/s of the two variations of table, another hinge could simply be a shaft bent to 90 deg with one end imbedded into the 45 deg corner of the 'fixed' table top and the other end into the corresponding 45 deg of the moving top. The Dia and length of the imbedded parts of the bar would depend on the strength required. Likely, supporting bushes set into the table top to receive the hinge rods would help longevity.

  4. #4
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    thanks DarBee for your reply.

    I don t think that 2 hinges will work. It has to have one point of pivot that is exactly at the junction of all the sides. Each panel is 20mm thick. and the panel will be quite heavy so i will need a solid hinge.

    The one i design would be ideal but i don t think i ever saw this type already manufactured. Attaching the hinge will not be a problem.
    15-04-13 9-42-28 PM.jpg

  5. #5
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    Hi Vincente,

    Maybe I did not explain myself very well. I agree, just ONE hinge, but a different shape, that is, a bar bent at 90 deg. How about I make a drawing (tomorrow) to illustrate that one hinge can give you two shape options. The (traditional) hinge you have described will need the very strong, in fact the weak point will likely be the method of attaching it to each 'top'.
    Daryl

  6. #6
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    OK, I couldn't shut down for the night without a response. The table wing 'flips-up-n-over' rather that swings outward and around. This way will take less turning space than the conventional hinge method. But the bottom of the wing in one position will be the top of the wing in the next position.

    Hope this explains the concept a bit better. See you tomorrow.

    Daryl
    Attached Files Attached Files

  7. #7
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Default

    Something like the first pics would be easy to make, but Daryl makes a good point about fixing it to the table tops. If you were to go this way i would make a plate with the hinge in one corner that could be screwed up under the tops. What else will support the moving leaf? A swing out leg or somesuch?
    The 90 deg bent hinge is a nice solution but it means you use both sides of the leaf depending on which way you have it. As a cabinetmaker i would consider that a PITA....
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  8. #8
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    cool, i am looking forward to see your solution!

    I have a few ideas to solidly fix the hinges by having to bent section fixed to the edges of the top panels

    15-04-13 10-46-28 PM.jpg

  9. #9
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    Good Morning Vincente, Isn't it good to wake up in the lucky country!
    Is your moving table wing/leaf expected to be supported or unsupported? If unsupported, the weak point will be the method of attaching the hinge - of whatever variety - to the the main table and/or the leaf. The 'pin' of the hinge is the easy part.

  10. #10
    Join Date
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    I think you would enjoy this book.

    Hinged Dissections: Swinging and Twisting by Greg N. Frederickson
    Hinged Dissections: Swinging and Twisting: Greg N. Frederickson: 9780521811927: Amazon.com: Books

    I was thinking about this problem similar to this a few months ago and concluded that a counter weight on an adjustable beam with a steel frame to support and balance the weight of the table top would be a suitable solution.

    -Josh

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