US3295846A - Constant force shock absorber - Google Patents

Constant force shock absorber Download PDF

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Publication number
US3295846A
US3295846A US450556A US45055665A US3295846A US 3295846 A US3295846 A US 3295846A US 450556 A US450556 A US 450556A US 45055665 A US45055665 A US 45055665A US 3295846 A US3295846 A US 3295846A
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movable wall
constant force
shock absorber
chamber
force
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US450556A
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Kenneth D Robertson
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs

Definitions

  • This invention relates to a shock absorber which exerts a constant force against a load.
  • the invention features simplicity and low-cost construction with a minimum of movable or wearable parts.
  • the single figure is a cross section through the apparatus.
  • a supporting framework 1 rests on base 2 and has a flexible or yieldable collar 3 thereon to limit movement of platform 4, mass 5 and rod 6 in a downward direction.
  • Movable wall 7 is connected to fixed wall 8 by bellows 9 to form an enclosed chamber.
  • a hole 10 is provided in support 1 to allow unrestricted passage of air at atmospheric pressure into and out of the area beneath movable wall 7.
  • a high vacuum is induced in chamber 11 by suitable means and limitless air under atmospheric pressure is admitted below movable wall 7 through hole 10. The result is a constant upward force through wall 7, rod 6 and platform 4.
  • Constant force-exerting apparatus comprising a sealed chamber, one side of said chamber comprising a movable wall, force-transmitting means connected to said movable wall to transmit force exerted by said movable wall, a high vacuum in said chamber creating a negative pressure on one side of said movable wall and atmospheric pressure applied freely to the opposite side of said movable wall to thereby exert a substantially constant force against said movable wall.
  • said chamber comprises a fixed wall connected to said movable wall through a bellows so that said movable wall may move relative to said fixed wall.
  • Apparatus as in claim 2 wherein the force-transmitting means connected to said movable wall comprises a rigid member projecting through said fixed wall.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)

Description

Jan. 3, 1967 D. ROBERTSON 3,295,846
CONSTANT FORCE SHOCK ABSORBER Filed April 25, 1965 form mo ab/e Afmosphenc pressure Base INVENTOR Kenn efh D Roberfsorz a. 7, 59 M ATTORNEYS.
United States Patent Ofifice 3,295,846 Patented Jan. 3, 1967 3,295,846 CONSTANT FURCE SHOCK ABSORBER Kenneth D. Robertson, 20 Sumner St, Canton, Mass. 02021 Filed Apr. 23,1965, Ser. No. 450,556 3 Claims. (Cl. 267-1) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.
This invention relates to a shock absorber which exerts a constant force against a load. The invention features simplicity and low-cost construction with a minimum of movable or wearable parts.
The single figure is a cross section through the apparatus.
A supporting framework 1 rests on base 2 and has a flexible or yieldable collar 3 thereon to limit movement of platform 4, mass 5 and rod 6 in a downward direction. Movable wall 7 is connected to fixed wall 8 by bellows 9 to form an enclosed chamber. A hole 10 is provided in support 1 to allow unrestricted passage of air at atmospheric pressure into and out of the area beneath movable wall 7.
A high vacuum is induced in chamber 11 by suitable means and limitless air under atmospheric pressure is admitted below movable wall 7 through hole 10. The result is a constant upward force through wall 7, rod 6 and platform 4.
From the foregoing it is seen that a substantially constant pressure is' exerted below movable wall 7 while a substantially constant negative pressure is exerted above movable wall 7. The result is a substantially constant upward force on platform 4 produced by the simple, inexpensive apparatus described.
I claim:
1. Constant force-exerting apparatus comprising a sealed chamber, one side of said chamber comprising a movable wall, force-transmitting means connected to said movable wall to transmit force exerted by said movable wall, a high vacuum in said chamber creating a negative pressure on one side of said movable wall and atmospheric pressure applied freely to the opposite side of said movable wall to thereby exert a substantially constant force against said movable wall.
2. Apparatus as in claim 1 wherein said chamber comprises a fixed wall connected to said movable wall through a bellows so that said movable wall may move relative to said fixed wall.
3. Apparatus as in claim 2 wherein the force-transmitting means connected to said movable wall comprises a rigid member projecting through said fixed wall.
No references cited.
ARTHUR L. LA POINT, Primary Examiner.
R. M. WOHLFARTH, Assistant Examiner.

Claims (1)

1. CONSTANT FORCE-EXERTING APPARATUS COMPRISING A SEALED CHAMBER, ONE SIDE OF SAID CHAMBER COMPRISING A MOVABLE WALL, FORCE-TRANSMITTING MEANS CONNECTED TO SAID MOVABLE WALL TO TRANSMIT FORCE EXERTED BY SAID MOVABLE WALL, A HIGH VACUUM IN SAID CHAMBER CREATING A NEGATIVE PRESSURE ON ONE SIDE OF SAID MOVABLE WALL AND ATMOSPHERIC PRESSURE APPLIED FREELY TO THE OPPOSITE SIDE OF SAID MOVABLE WALL TO THEREBY EXERT A SUBSTANTIALLY CONSTANT FORCE AGAINST SAID MOVABLE WALL.
US450556A 1965-04-23 1965-04-23 Constant force shock absorber Expired - Lifetime US3295846A (en)

Priority Applications (1)

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US450556A US3295846A (en) 1965-04-23 1965-04-23 Constant force shock absorber

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732033A (en) * 1986-09-26 1988-03-22 Kenneth L. Smedberg Pneumatic die cushion
US4736615A (en) * 1987-01-22 1988-04-12 Kenneth L. Smedberg Pneumatic press counterbalance
US4781363A (en) * 1979-03-01 1988-11-01 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Vibration isolator particularly of the antiresonance force type
US4860571A (en) * 1986-09-26 1989-08-29 Kenneth L. Smedberg Power press with improved cushioning system
US5027637A (en) * 1988-12-26 1991-07-02 Nhk Spring Co., Ltd. Die cushion for applying pressure to a press machine via gas pressurized push rods
US5392962A (en) * 1992-12-31 1995-02-28 Meshberg; Philip Atomizing pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781363A (en) * 1979-03-01 1988-11-01 Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung Vibration isolator particularly of the antiresonance force type
US4732033A (en) * 1986-09-26 1988-03-22 Kenneth L. Smedberg Pneumatic die cushion
US4860571A (en) * 1986-09-26 1989-08-29 Kenneth L. Smedberg Power press with improved cushioning system
US4736615A (en) * 1987-01-22 1988-04-12 Kenneth L. Smedberg Pneumatic press counterbalance
US5027637A (en) * 1988-12-26 1991-07-02 Nhk Spring Co., Ltd. Die cushion for applying pressure to a press machine via gas pressurized push rods
US5392962A (en) * 1992-12-31 1995-02-28 Meshberg; Philip Atomizing pump

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