GB2152625A - Rotary fluid damper for artificial leg pivot - Google Patents

Rotary fluid damper for artificial leg pivot Download PDF

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Publication number
GB2152625A
GB2152625A GB08400255A GB8400255A GB2152625A GB 2152625 A GB2152625 A GB 2152625A GB 08400255 A GB08400255 A GB 08400255A GB 8400255 A GB8400255 A GB 8400255A GB 2152625 A GB2152625 A GB 2152625A
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United Kingdom
Prior art keywords
pivoting
fluid
shaft
objects
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08400255A
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GB8400255D0 (en
Inventor
Sen-Jung Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08400255A priority Critical patent/GB2152625A/en
Publication of GB8400255D0 publication Critical patent/GB8400255D0/en
Publication of GB2152625A publication Critical patent/GB2152625A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/68—Operating or control means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/64—Knee joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/68—Operating or control means
    • A61F2/74—Operating or control means fluid, i.e. hydraulic or pneumatic
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/145—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only rotary movement of the effective parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2002/5003—Prostheses not implantable in the body having damping means, e.g. shock absorbers

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Transplantation (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Cardiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • General Engineering & Computer Science (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Prostheses (AREA)

Abstract

A rotary fluid damper includes a sleeve 20, a shaft 30 and a fixed partition 40. The shaft 30 has two radially enlarged annulations (31, 32) which close off the ends of the sleeve 20 and a vane 33 which extends axially between the two annulations (31, 32) and radially to closely engage the interior wall of the sleeve 20. The sleeve 20 is mounted on the knee of an artificial leg and the shaft 30 is mounted on the thigh. The space formed between the shaft 30 and the sleeve 20 is divided into two compartments 70, 80 by the fixed and movable vanes 40, 33. The shaft 30 is a hollow member and houses a replenishing cushioning fluid supplier 60 and a check valve 50 to supply the compartments 70, 80 via hole 36 when there is fluid loss. The shaft 30 is further provided with a second hole (38) to let the fluid contained in one of the two compartments 70, 80 flow through the first 36 and second (38) holes to the other one compartment to damp pivoting movement of the leg. <IMAGE>

Description

SPECIFICATION A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature The present invention relates to a fluid cushioning apparatus, and more particularly to a fluid cushioning apparatus which itself acts as a a pivoting medium of two objects having a pivoting feature.
A typical prior fluid cushioning apparatus, as shown in Fig. 1, includes a hydraulic cylinder 1, a separating piece 2 fixed to cylinder 1, a piston rod 3 and two pistons 4, 5 secured on rod 3. Piece 2 is penetrated by rod 3 and kept a liquid tight relation with rod 3. Thus, cylinder 1 is formed into two compartments 6, 7. When rod 3 is actuated by a connecting rod 8 to move up or down the liquid contained in the compressed compartment will flow through a passage 9 to the other compartment. The liquid flow through passage 9 is controlled by a needle valve 10 and thus a cushioning effect is achieved, i.e.
rod 3 will move slowly because piston 4 or 5 is cushioned by the compressed liquid contained in the compressed compartment. Such a cushioning device is widely used in a field which has two objects in pivoting relation and needs a cushioning result. An example of incorporating such a device is shown in Fig. 2 which shows an artificial leg 11 having a thigh part 12 and a shank part 13 pivoted together on a knee part 14. The device is incorporated within shank part 13 and connecting rod 8 is pivoted on knee part 14 so that connecting rod 8 actuates piston rod 3 up and down when thigh part 12 is lifted down and up to obtain a cushioned movement for the amputee who wears artificial leg 11. A returning spring 15 is compressed when rod 3 is urged downwardly and thus is helpful to assist the amputee to stand up.
However, such a device suffers the following disadvantages. The first, such a device takes so much a volume and a weight. The second, such a device has a hydraulic liquid loss due to frequent reciprocating movements, and thus cylinder 1 is not always full of hydraulic liquid and the cushioned movement is not smooth and happens to be in vibration, and the hydraulic liquid has to be refilled from time to time. It is therefore tried by the applicant to obviate the above disadvantages.
According to the present invention, a fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature includes a sleeve adapted to be mounted on a first object, two annulations coaxially mounted in the two ends of the sleeve respectively, a shaft mounted in the openings of the centers of the two annulations and having a dividing wall being axially and radially extended between the two annulations to closely engage with the interior wall of the sleeve and being adapted to be mounted on a second object which is always to have a pivoting relationship with the first object, a partitioning piece capable of being fitted among the sleeve, the shaft and the two annulations and secured on the sleeve so that the space formed among the shaft, the two annulations and the sleeve is divided into two compartments and a means controlling the flow of a fluid contained in the space when the first and second objects are in relative pivoting movement and thus the fluid contained in one of the two compartments will flow through the means to the other one compartment so that the pivoting movement, of the first and second objects is cushioned by the controlled fluid flow.
The two annulations can be integrally formed with the sleeve.
Certainly, the two annulations can also be integrally formed to the shaft and be closely and rotatably mounted in the sleeve.
The partitioning piece can also be integrally formed to the sleeve and the annulations be detachably mounted on the shaft.
Preferably the shaft is a hollow member one end of which is mounted a replenishing cushioning fluid supplier while the other end of which is mounted a check valve and the shaft has a first hole so that the fluid supplier will supply the space with new cushioning fluid through the check valve and the first hole when there is a fluid loss in the space.
The controlling means can be an orifice of an appreciable small size on the partitioning piece to allow a little rate of the fluid flow.
Generally, the partitioning piece is closely fitted among the sleeve, the shaft and the two annulations and the controlling means is a second hole on the shaft so that the fluid contained in one of the two compartments will flow through the first and second holes to the other one compartment when the first and second objects are in relative pivoting movement.
The check valve can include a ball, a ball seat formed on the interior wall of the shaft for receiving the ball, a spring engaging with the ball from a direction opposite to that of the ball seat engaging with the ball and a first plug having a first threaded head screwed into the other end to urge the spring against the ball and capable of shielding the second hole so that both of the opening of the second hole and the pre-determined spring pressure on the ball can be adjusted by screwing the first plug.
The replenishing cushioning fluid supplier can include a second plug having a second threaded head screwed into the one end, a spring having a first end engaged with the second plug and a second end and a piston engaged with the second end and capable of slidably and closely engaging with the interior wall of the shaft so that the fluid contained between the piston and the ball seat is ready for replenishing the space with new fluid through the check valve.
The first object can be the shank of an artificial leg and the second object can be the thigh of the artificial leg.
The cushioning fluid used can be a hydraulic liquid or a gas.
It is therefore an object of the present invention to provide a fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature having a small volume and weight.
It is therefore another object of the present invention to provide a fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature having a cylinder which is always full of fluid to secure a smooth cushioned movement.
These and other advantages of the present invention may best be understood with reference to the accompanying drawings, in which Figure 1 is a sectional view showing a hydraulic cylinder of the known hydraulic cushioning apparatus; Figure 2 is a sectional view showing an artificial leg incorporating a known hydraulic cushioning apparatus; Figure 3 is an exploded view showing the elements of a preferred embodiment of a fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature of the present invention; Figure 4A is a longitudinal section view of a preferred embodiment of the present invention; Figure 4B is a transverse section view of a preferred embodiment of the present invention; and Figure 5 is a perspective view showing the knee part of an artificial leg incorporating a hydraulic cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature of the present invention.
Referring now to Fig. 3, there is shown an exploded view of a fluid cushioning apparatus of the present invention which includes a sleeve 20, a shaft 30 and a partitioning piece 40. Shaft 30 has two radially enlarged annulations 31, 32 and a dividing wall 33 being radially and axially extended between annulations 31, 32. Annulations 31, 32 and dividing wall 33 can be closely rotated within sleeve 20. A partitioning piece 40 capable of closely fitted among sleeve 20, shaft 30 and annulations 31, 32 is secured on a thickened place 21 on sleeve 20 by two screws 41, 42 so that the space defined by shaft 30 and sleeve 20 is divided into two compartments 70, 80 by partitioning piece 40 and dividing wall 33, as shown in Fig. 4B which shows a transverse section view of a cushioning apparatus of the present invention.Shaft 30 is a hollow member one end of which 34 is mounted a replenishing cushioning fluid supplier 60 while the other end of which 35 is mounted a check valve 50 and shaft 30 has a first hole 36 so that liquid supplier 60 will supply the space with new cushioning fluid through check valve 50 and hole 36 when there is a fluid loss in the space.
Check valve 50 includes a ball 51, a ball seat 37 formed on the interior wall of shaft 30 for receving ball 51, a spring 52 and a first plug 53 having a first threaded head 531 screwed into end 35 to urge spring 52, ball 51 against ball seat 37.
Replenishing cushioning fluid supplier 60 includes a second plug 61 having a second threaded head 611 screwed into end 34, a spring 62 having a first end 621 engaged with second plug 61 and a piston 63 engaged with a second end 622 of spring 62.
Piston 63 is capable of slidably and closely engaging with the interior wall of shaft 30 so that the cushioning fluid contained between piston 63 and ball seat 37 is ready for replenishing the space with new fluid should there is any fluid loss in compartments 70, 80 by way of spring 62 upwardly urging the top end 631 of third plug 63 to push the fluid contained between top end 631 and ball seat 37 to pass through check valve 50.
A second hole 38 on shaft 30 and hole 36 permit the communication of the cushioning fluid between compartments 70, 80. Thus, when sleeve 20 and shaft 30 are in relative pivoting movement partitioning piece 40 forces the liquid contained in compartment 70 (80) to pass slowly through holes 36, 38 to the other compartment 80 (70). It is therefore that the pivoting movement is cushioned by the compressed fluid. An end 532 of plug 53 is designed to shield hole 38 when head 531 is further screwed into end 35 and plug 53 can adjust the pre-determined pressure of spring 52 on ball 51 by screwing plug 53 up or down.
Fig. 4A shows a longitudinal section view of a cushioning apparatus of the present invention. The rotating parts are fitted with gasket rings 39 on shaft 30, 533 on plug 53 and 632 on plug 63 or gasket strips 331 on dividing wall 33 and 401 on partitioning piece 40.
Fig. 5 shows a fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature of the present invention incorporated into the knee part of an artificial leg. The thickened place 21 on sleeve 20 can directly be locked in a groove formed on the knee part so that no additional procedure is needed to secure sleeve 20 on the knee part.

Claims (9)

1. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature characterised in that said apparatus comprises: a sleeve adapted to be mounted on a first object; two annulations coaxially mounted in the two ends of said sleeve respectively; a shaft mounted in the openings of the centers of said two annulations and having a dividing wall being axially and radially extended between said two annulations to closely engage with the interior wall of said sleeve and being adapted to be mounted on a second object which is always to have a pivoting relationship with said first object; a partitioning piece capable of being fitted among said sleeve, said shaft and said two annulations and secured on said sleeve so that the space formed between said shaft and said sleeve is divided into two compartments; and a means controlling the flow of a cushioning fluid contained in said space when said first and second objects are in relative pivoting movement and thus the fluid contained in one of said two compartments will flow through said means to the other one compartment so that said pivoting movement of said first and second objects is cushioned by said controlled fluid flow.
2. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 1 characterised in that said two annulations are integrally formed with said sleeve.
3. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 1 characterised in that said partitioning piece is integrally formed to said sleeve and said annulations are detachably mounted on said shaft.
4. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to claim 1 characterised in that said two annulations are integrally formed to said shaft and are closely and rotatably mounted in said sleeve.
5. A fluid cushioning apparatus acting as a pivoting medium of two object having a pivoting feature according to any one of the preceding Claims characterised in that said shaft is a hollow member one end of which is mounted a replenishing cushioning fluid supplier while the other end of which is mounted a check valve and said shaft has a first hole so that said fluid supplier will supply said space with new cushioning fluid through said check valve and said first hole when there is a liquid loss in said space.
6. A fluid cushioning apparatus acting as a pivoting medium of two objects have a pivoting feature according to Claim 5 characterised in that said controlling means is an orifice of an appreciable small size on said partitioning piece to allow a little rate of said fluid flow.
7. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 5 characterised in that said partitioning piece is closely fitted among said sleeve, said shaft and said two annulations and said controlling means is a second hole on said shaft so that said fluid contained in one of said two compartments will flow through said first and second holes to the other one compartment when said first and second objects are in relative pivoting movement.
8. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 5, 6 or 7 characterised in that said check valve comprising: a ball; a ball seat formed on said interior wall of said shaft for receiving said ball; a spring engaging with said ball from a direction opposite to that of said ball seat engaging with said ball; and a first plug having a first threaded head screwed into said the other end to urge said spring against said ball and being capable of shielding said second hole so that both of the opening of said second hole and the predetermined spring pressure on said ball can be adjusted by screwing said first plug.
9. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature substantially as hereinbefore described with reference to the accompanying drawings.
9. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to any one of Claims 5-8 characterised in that said replenishing cushioning fluid supplier comprising: a second plug having a second threaded head screwed into said one end; a spring having a first end engaged with said second plug and a second end; and a piston engaged with said second end and capable of slidably and closely engaging with said interior wall of said shaft so that the cushioning fluid contained between said piston and said ball seat is ready for replenishing said space with new fluid through said check valve.
10. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to any one of the preceding Claims characterised in that said first object is the knee of an artificial leg and said second object is the thigh of said artificial leg.
11. A fluid cushioning apparatus acting as a pivtong medium of two objects having a pivoting feature substantially as hereinbefore described with reference to the accompanying drawings.
CLAIMS Amendments to the claims have been filed, and have the following effect:~ (a) Claims 1-11 above have been deleted or textually amended.
(b) New or textually amended claims have been filed as follows:~
1. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature characterized in comprising: a sleeve adapted to be mounted on a first object; two annulations coaxially mounted in the two ends of said sleeve respectively and each of which has an opening at its central area; a hollow shaft mounted in the two openings of said two annulations, having a dividing wall axially and radially extended between said two annulations to closely engage with the interior wall of said sleeve, having a first hole and being adapted to be mounted on a second object which is always to have a pivoting relationship with said first object;; a a partitioning piece capable of being fitted among said sleeve, said shaft and said two annulations and being secured on said sleeve so that the space formed between said shaft and said sleeve is divided into two compartments; a means controlling the flow of a cushioning fluid contained in said space when said first and second objects are in relative pivoting movement and thus the fluid contained in one of said two compartments will flow through said means to the other one compartment so that said pivoting movement of said first and second objects is cushioned by said controlled fluid flow; a a replenishing cushioning fluid supplier mounted in one end of said hollow shaft; and a check valve mounted in the other end of said hollow shaft so that said fluid supplier will supply said space with new cushioning fluid through said check valve and said first hole on said shaft when there is a liquid loss in said space; further characterised in that said first hole is commonly formed with said means.
2. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 1 characterized in that said two annulations are integrally formed with said sleeve.
3. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 1 characterized in that said partitioning piece is integrally formed to said sleeve and said annulations are detably mounted on said shaft.
4. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature acocrding to Claim 1 characterized in that said two annulations are integrally formed to said shaft and are closely and rotatably mounted in said sleeve.
5. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 4 characterized in that said controlling means is an orifice of an appreciable small size on said partitioning piece to allow a little rate of said fluid flow.
6. A fluid cushioning apparatus acting as a a pivoting medium of two objects having a pivoting feature according to Claim 4 characterized in that said partitioning piece is closely fitted among said sleeve, said shaft and said two annulations and said controlling means is a second hole on said shaft so that said fluid contained in one of said two compartments will flow through said first and second holes to the other one compartment when said first and second objects are in relative pivoting movement.
7. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to Claim 6 characterized in that said check valve comprises: a ball; a ball seat formed on the interior wall of said shaft for receiving said ball; a spring engaging with said ball from a direction opposite to that of said ball seat engaging with said ball; and a first plug having a first threaded head screwed into said the other end to urge said spring against said ball and being capable of shielding said second hole so that both of the opening of said second hole and the predetermined spring pressure on said ball can be adjusted by screwing said first plug.
8. A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature according to any one of the preceding Claims characterized in that said first object is the knee of an artificial leg and said second object is the thigh of said artificial leg.
GB08400255A 1984-01-06 1984-01-06 Rotary fluid damper for artificial leg pivot Withdrawn GB2152625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08400255A GB2152625A (en) 1984-01-06 1984-01-06 Rotary fluid damper for artificial leg pivot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08400255A GB2152625A (en) 1984-01-06 1984-01-06 Rotary fluid damper for artificial leg pivot

Publications (2)

Publication Number Publication Date
GB8400255D0 GB8400255D0 (en) 1984-02-08
GB2152625A true GB2152625A (en) 1985-08-07

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GB08400255A Withdrawn GB2152625A (en) 1984-01-06 1984-01-06 Rotary fluid damper for artificial leg pivot

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015034598A (en) * 2013-08-09 2015-02-19 トックベアリング株式会社 Torque automatic adjusting type rotary damper

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1084220A (en) * 1964-07-23 1900-01-01
GB231125A (en) * 1924-03-21 1925-08-06 Primo Arena
GB376007A (en) * 1931-07-02 1932-07-07 American Chain & Cable Co Improvements in and relating to hydraulic shock absorbers
GB601502A (en) * 1944-10-06 1948-05-06 George Gale Bakewell Door checking hinges
GB869061A (en) * 1956-10-31 1961-05-25 Armstrong Patents Co Ltd Improvements in or relating to door-operating appliances
GB879132A (en) * 1957-10-07 1961-10-04 Houdaille Industries Inc Improvements in or relating to dampers
GB1201262A (en) * 1966-10-06 1970-08-05 Speke Telephones Ltd Improvements relating to telephone dials
GB1566699A (en) * 1976-12-03 1980-05-08 Nash A Dashpots

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB231125A (en) * 1924-03-21 1925-08-06 Primo Arena
GB376007A (en) * 1931-07-02 1932-07-07 American Chain & Cable Co Improvements in and relating to hydraulic shock absorbers
GB601502A (en) * 1944-10-06 1948-05-06 George Gale Bakewell Door checking hinges
GB869061A (en) * 1956-10-31 1961-05-25 Armstrong Patents Co Ltd Improvements in or relating to door-operating appliances
GB879132A (en) * 1957-10-07 1961-10-04 Houdaille Industries Inc Improvements in or relating to dampers
GB1084220A (en) * 1964-07-23 1900-01-01
GB1201262A (en) * 1966-10-06 1970-08-05 Speke Telephones Ltd Improvements relating to telephone dials
GB1566699A (en) * 1976-12-03 1980-05-08 Nash A Dashpots

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015034598A (en) * 2013-08-09 2015-02-19 トックベアリング株式会社 Torque automatic adjusting type rotary damper

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Publication number Publication date
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