CA2010974A1 - Damping device for shock loads - Google Patents
Damping device for shock loadsInfo
- Publication number
- CA2010974A1 CA2010974A1 CA 2010974 CA2010974A CA2010974A1 CA 2010974 A1 CA2010974 A1 CA 2010974A1 CA 2010974 CA2010974 CA 2010974 CA 2010974 A CA2010974 A CA 2010974A CA 2010974 A1 CA2010974 A1 CA 2010974A1
- Authority
- CA
- Canada
- Prior art keywords
- core
- damping device
- passages
- throttling
- ridges
- 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.)
- Abandoned
Links
Landscapes
- Combined Devices Of Dampers And Springs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Damping Device for Shock Loads The present invention relates to an energy-absorbing damping device, wherein a core bounds a cavity filled with fluid and wherein, each of the passages provided in the core 1 forms an outer opening at the outer perimeter of the core 1 and a connection to a means yielding elastically to fluid pressure. It is desirable that the damping device should be less complex. This is achieved in that the passages are of narrow construction to act as throttling passages and that the elastically yielding means is an elastically extensible diaghragm fixed and sealed all around and covering the outer opening of the throttling passages . The energy absorption takes place when the energy of an impact or shock forces the fluid through the narrow throttling- passages and the elastic diaphragm is extended ( see Fig.2).
Damping Device for Shock Loads The present invention relates to an energy-absorbing damping device, wherein a core bounds a cavity filled with fluid and wherein, each of the passages provided in the core 1 forms an outer opening at the outer perimeter of the core 1 and a connection to a means yielding elastically to fluid pressure. It is desirable that the damping device should be less complex. This is achieved in that the passages are of narrow construction to act as throttling passages and that the elastically yielding means is an elastically extensible diaghragm fixed and sealed all around and covering the outer opening of the throttling passages . The energy absorption takes place when the energy of an impact or shock forces the fluid through the narrow throttling- passages and the elastic diaphragm is extended ( see Fig.2).
Description
::: 2(3 ~(~97~
Applicant: Dr. Michael Polus .~, s Title: Damping Device for Shock Loaas .
. . .
, .
Description This invention relates to an energy-absorbing damping device for shock loads wherein a core consists of elastically deformable material, is ela~tically com-pressible and bounds a fluid-filled cavity, wherein valveless passages formed in the core extend from said cavity, each forming an opening at the perimeter of the core and providing a connection to means which elasti-cally yield to fluid pressure, wherein hydraulic throttling devices are provided between said cavity and the elastically yielding means and wherein the core forms a supporting surface and a load surface which are on opposite sides, said passages extending substan-tially in the direction of said surfaces. -In a prior-art (German Patent 12 03 578) damping device of this kind, the passages providing the connections are of a wide configuration. With their outer open-ings, the connecting passages communicate with a con-duit to which are connected gas cushions which are elastically compre~sed as a load is applied to the core. The fluid entering the gas cushions via one-way ;~i valves returns via throttling valves into the conduit. -~
The use of the conduit, the gas cushion and the valves makes this damping device a complex one.
~: :
It is an object of the present invention to provide a , damping device of the type initially referred to which is less complex. In achieving this object, the damping device according to the invention is characterized in ~ . .
~ that the passages are of narrow construction to act as ., , .
., : .
Applicant: Dr. Michael Polus .~, s Title: Damping Device for Shock Loaas .
. . .
, .
Description This invention relates to an energy-absorbing damping device for shock loads wherein a core consists of elastically deformable material, is ela~tically com-pressible and bounds a fluid-filled cavity, wherein valveless passages formed in the core extend from said cavity, each forming an opening at the perimeter of the core and providing a connection to means which elasti-cally yield to fluid pressure, wherein hydraulic throttling devices are provided between said cavity and the elastically yielding means and wherein the core forms a supporting surface and a load surface which are on opposite sides, said passages extending substan-tially in the direction of said surfaces. -In a prior-art (German Patent 12 03 578) damping device of this kind, the passages providing the connections are of a wide configuration. With their outer open-ings, the connecting passages communicate with a con-duit to which are connected gas cushions which are elastically compre~sed as a load is applied to the core. The fluid entering the gas cushions via one-way ;~i valves returns via throttling valves into the conduit. -~
The use of the conduit, the gas cushion and the valves makes this damping device a complex one.
~: :
It is an object of the present invention to provide a , damping device of the type initially referred to which is less complex. In achieving this object, the damping device according to the invention is characterized in ~ . .
~ that the passages are of narrow construction to act as ., , .
., : .
- 2 - ~ 9 throttling passages, in that the elastically yielding means is an elastically extensible diaphragm fixed and sealed all round and covering the outer openings of the throttling passages, in that the cavity is bounded by a depression provided in the supporting surface or load surface of the core, in that the throttling passages formed in the load or supporting surface of the core forming the depression are open at one side and roofed over by cover means, and in that the throttling pas-sages are bounded at their sides by ridges formed in the core, the cross-section of said ridges decreasing towards their tips.
Energy-absorption takes place in as much as the energy of an impact or shock forces the fluid through the narrow throttling passages and the elastic diaphragm i8 extended. The damping device requires little space and is straightforward because there is only the extensible diaphragm provided instead of a plurality of additional parts, such as the ring conduit, gas cushions and valves. Damping takes place under conditions of suc-cessive energy dissipation and without any oscilla-tions. The damping action is not sudden and forceful initially, but increases gradually.
The throttling passages provided in the surface result in improved energy dissipation in damping applications.
They afford greater freedom in designing the structured surface to match desired damping conditions. Because the throttling passages are provided in its surface, it is possible to design the core with a lower Shore hardness than in a configuration where the throttling passages are completely bounded by the core, i.e. en-closed by the core all round.
The damping device according to the invention in-volves an elastic hydraulic energy-absorption system where fluid is forced through throttling passages out of the elastic cavity which is formed to suit th2 ~ ~ 7~~~
applied. The forced out fluid is collected in the dia-phragm and is returned in the working cycle into the cavity which was deformed by the shock or impact. The parameters: elasticity, volume and throttling device~
produce an exactly defined damping performance. Any peak forces as occurring in rigid systems due to iner-tia are avoided. Under conditions of constant static loading, the damping device can be used as a damped oscillation system.
In the case of the damping device according to the in-vention, the core is subject to less flexing under im-pact and to less increase in diameter. The friction of the diaphragm on the core as its shape changes due to loading and unloading is reduced. It doe~ not matter whether the surface which is provided with the cavity and the ridges or ribs is the load surface or the sup-porting surface and whether the ridges are directed upwards and downwards. The material of the core may be less soft and less compressible so that flexing and instability are reduced and practically avoided. Under conditions of shock or impact, the ridges are com-pressed and through the dimensioning of the ridges the extent and pattern of energy absorption can be more conveniently calculated and controlled. Since, as a rule, the core would be round or oval in plan, the ridges would as a rule extend in a radial direction.
The diaphragm or foil may, for instance, consist of an elastic plastic or synthetic rubber. The core, for in-stance, may consist of closed-cell polyurethane, 9ili- ~-cone rubber or cellular rubber. The diameter of the throttling passages depends on the specific use of the damping device and the desired damping characteristic.
The core would generally be in one piece. In plan, the structure according to the invention would be circular, oval or even rectangular.
~ 4 ~ 2~97-~
It is especially effective and advantageous if the ridges whGse cross-section decreases towards their tips have their one side rising at a flatter angle than the other. On application of shock or impact, these ridges will deflect to the side of their steeper flank whereby improved control of the energy absorption i9 obtained.
The effect of lateral deflection can be influenced by varying the angles of the steeper flank and the flatter flank.
Furthermore, it is especially effective and advanta-geous if the ridges are provided on a substantially plane surface of the truncated core and the height of the ridges rising from the truncation surface increases in the direction towards the outer perimeter of the truncation surface so as to form a depression. In this case, the throttling passages will initially be closed only in the area of the greater ridge height by the cover means and produce their throttling action only in said closed area. As compression due to the impact in-creases, closure of the passages also extends to the lower heights of the ridges whereby the length of the throttling passages in which throttling action occurs increases.
:
Moreover, it is specially effective and advantageous if the length of the ridges equals at least one third of half the diameter of the supporting or load surface in the direction of the ridges. Starting from this minimum length of the ridges, the throttling passage~ will have a length which provides useful results in a great num-ber of applications.
It is also specially effective and advantageous if the fluid is silicone oil. Silicone oil is non-toxic and ;
useful over a wide temperature range from minus 70 to plus 200. Dimensioning the energy absorption action is simplified where silicone oil is used. ;~
'~' '''~
- 5 - ~ 9~4 If the damping device provided with the ridges accord-ing to the invention is subjected to a sudden load directed against it, what happens is as follows:
A pressure build-up occurs in the fluid whereby the fluid is accelerated towards the outside and fluid flow occurs through the ridge structure.
Simultaneously, due to the outer load applied, the -~
ridge structure is deformed, for instance, the outer ridge tips will be deflected; as the load increases, the flow passages continue to narrow, throttling action is produced and there will be a pressure build-up with energy consumption increasing exponentially. At the end of load application, the major portion of the fluid will have collected at the outer perimeter of the core, causing dilation of the diaphragm.
During the subsequent unloading, the ridge structure will rise again immediately; this and the force of the dilated diaphragm will cause the fluid to return into the cavity as unloading takes place.
:
It is especially effective and advantageous if more than two throttling passages are provided. A greater number, for instance more than three throttling pas-i` sages, will i~prove the effectiveness of the damping device.
:.
`~ The damping device according to the invention is de-signed to provide a gradually increasing damping pat-tern and to avoid a high initial oscillation. It is specially effective and advantageous if the core, the throttling passages and the diaphragm are matched up to give a paraboloidal damping characteristic. Such a damping characteristic, i.e. the variation of such a force plotted against time, is preferred for many ap-plications where a sudden load is applied to the load surface. ~ --;
2~97 Another specially effective and advantageous configura tion provides for the cavity to be bounded by an area of the diaphragm spanning the cavity and extending over a raised part forming the cavity as far as over the outer open-ings of the throttling passages. In this configuration, the fluid will return very quickly at the end of the impact from the dilated part of the di-aphragm at the outer openings of the throttling pas-sages via said raised part into the cavity.
The damping device according to the invention, espe-cially if it is formed with the ridges is a special asset when applied to the lower part, in particular the heel area, of a shoe. The damping device will improve the comfort of the shoe with simple means.
A preferred embodiment of the invention is illustrated in the drawing in which:
Figs. 1 - 4 each shows a cross-section through a damp-ing device for sudden loads in various phases of loading and unloading, Figs. 5 - 7 each shows a part of the damping device according to Fig. 1 under different loading conditions of the ridges and Fig. 8 shows the time-force characteristic at a supporting surface of the d~mping device with a shock load applied to the load sur-- face. ~ -~
The damping device according to Figs. 1 - 7 comprises a --single-piece core 1 which has a circular perimeter and, on one side, forms an uneven supporting surface 2 which -bears upon a base which is not shown. In the area of ~-~
the supporting surface, the core 1 forms a broken cir-cumferential raised part 4 which surrounds a dish-- - -- 7 ~ 097~
shaped cavity 5. The raised part g is formed by radi-ally extending ridges 16 which, at the center, leave a secondary space 17 clear and steadily increase in their height from the inside to the outer perimeter of the core 1 relative to a plane truncating core surface 18.
At the side of the core 1 opposite the supporting sur-face 2 there is provided a plane load surface 6 onto which a loading member which is not shown in detail is capable of acting as shown by the arrows 13. In the surface of the core 1 are provided a plurality of straight radially extending elongated throttling pas-sages which are open at one side and each of which is formed at the outer rim of the core with an outer opening 9 while its inner opening 10 is located in the central area of the dish-shaped depression 5 at its bottom [top] proximate to the secondary space 17. A
diaphragm 11 is provided which is attached to the load surface 6 with a flat joint which seals in the fluid.
The diaphragm 11 extends over the outer rim of the core 1 and the outer openings 9 provided in the latter and is undetatched to the core rim. As shown in Fig. 1, the diaphragm 11 is so~ewhat slack and has some clearance relative to the rim of the core while a clearance also exists relative to the crest of the raised part 4.
The throttling passages 8 are each bounded at the side by a ridge 16 whose cross-section is shown in Fig. 5.
Since the ridges 16 extend radially, the size of their contour increases from the inside towards the outer rim of the core 1. The cross-section of each ridge 16 de-creases as shown in Fig. 1 towards its tip or crest.
~ccording to Fig. 1, this decrease is relatively pro- -~
nounced and acute. It is also possible to adopt a rounded or trapezoidally decreasing cross-section. Each ridge 16 is formed with a little inclined flank 19 and a steeply inclined flank 20. ~
~:
, -- 8 - ~Q~097 At the rim face of the core, the diaphragm 11 extends not only with a loose contact, but slack with a clear-ance 21 to the crest of the raised part ~ and then, with its portion 12, covers the cavity 5. The cavity 5, the throttling passages 8 and the clearance space 21 are filled with a fluid, for instance, silicone oil.
When the loading member acts according to the arrows 13 suddenly or shock-like onto the damping device accord-ing to Fig. 1, then the core l together with its ridges 16 is stressed in compression, with the ridges being deformed as shown in Figs. 6 and 7. The volume of the cavity 5 is decreased and the throttling passages 8 are closed progressively starting on the outer rim of the . .
core 1 towards the inside and their cross-section i9 narrowed. Liquid is emitted at the outer openings 9 so that the diaphragm 11 is dilated in a radial direction as shown in Fig. 3 to form a convolution 14 which ex-tends all round. When, according to Fig. 4, unloading takes place after the impact, fluid returns through the throttling passages 8 which have their full, if only narrow, cross-section restored very quickly, with the ridges 16 rising into their upright position.
.
According to Figs. 1 - 4, the diaphragm 11 is made up of a disc-shaped portion and a cup~shaped portion which ;~
are tightly welded to each other along a peripheral area 22. As shown in Figs. 1 - 4, cover means 23 ex-tending over the passages 8 are formed by part of the diaphragm. It is conceivable to have two or more cores stacked in a common enclosing diaphragm in a manner -that the ridges of the one core contact the plane load ~-surface of the adjacent core when this load surface acts as a cover means.
Plotted in Fig. 8 i5 the force applied by the sudden load according to the arrows 13 and measured at the supporting surface 2 as a function of time. Transmis-sion of the sudden load is subject to damping action, :
/ - :
9 ~ 97~
i.e. the load will be transmitted without any initial peaks to the supporting surface 2 and rise steadily to its maximum value.
~
'~
-~ ' ''''' ~:' '' .
:, .
( :
.}
..
'!
',''''~"..
Energy-absorption takes place in as much as the energy of an impact or shock forces the fluid through the narrow throttling passages and the elastic diaphragm i8 extended. The damping device requires little space and is straightforward because there is only the extensible diaphragm provided instead of a plurality of additional parts, such as the ring conduit, gas cushions and valves. Damping takes place under conditions of suc-cessive energy dissipation and without any oscilla-tions. The damping action is not sudden and forceful initially, but increases gradually.
The throttling passages provided in the surface result in improved energy dissipation in damping applications.
They afford greater freedom in designing the structured surface to match desired damping conditions. Because the throttling passages are provided in its surface, it is possible to design the core with a lower Shore hardness than in a configuration where the throttling passages are completely bounded by the core, i.e. en-closed by the core all round.
The damping device according to the invention in-volves an elastic hydraulic energy-absorption system where fluid is forced through throttling passages out of the elastic cavity which is formed to suit th2 ~ ~ 7~~~
applied. The forced out fluid is collected in the dia-phragm and is returned in the working cycle into the cavity which was deformed by the shock or impact. The parameters: elasticity, volume and throttling device~
produce an exactly defined damping performance. Any peak forces as occurring in rigid systems due to iner-tia are avoided. Under conditions of constant static loading, the damping device can be used as a damped oscillation system.
In the case of the damping device according to the in-vention, the core is subject to less flexing under im-pact and to less increase in diameter. The friction of the diaphragm on the core as its shape changes due to loading and unloading is reduced. It doe~ not matter whether the surface which is provided with the cavity and the ridges or ribs is the load surface or the sup-porting surface and whether the ridges are directed upwards and downwards. The material of the core may be less soft and less compressible so that flexing and instability are reduced and practically avoided. Under conditions of shock or impact, the ridges are com-pressed and through the dimensioning of the ridges the extent and pattern of energy absorption can be more conveniently calculated and controlled. Since, as a rule, the core would be round or oval in plan, the ridges would as a rule extend in a radial direction.
The diaphragm or foil may, for instance, consist of an elastic plastic or synthetic rubber. The core, for in-stance, may consist of closed-cell polyurethane, 9ili- ~-cone rubber or cellular rubber. The diameter of the throttling passages depends on the specific use of the damping device and the desired damping characteristic.
The core would generally be in one piece. In plan, the structure according to the invention would be circular, oval or even rectangular.
~ 4 ~ 2~97-~
It is especially effective and advantageous if the ridges whGse cross-section decreases towards their tips have their one side rising at a flatter angle than the other. On application of shock or impact, these ridges will deflect to the side of their steeper flank whereby improved control of the energy absorption i9 obtained.
The effect of lateral deflection can be influenced by varying the angles of the steeper flank and the flatter flank.
Furthermore, it is especially effective and advanta-geous if the ridges are provided on a substantially plane surface of the truncated core and the height of the ridges rising from the truncation surface increases in the direction towards the outer perimeter of the truncation surface so as to form a depression. In this case, the throttling passages will initially be closed only in the area of the greater ridge height by the cover means and produce their throttling action only in said closed area. As compression due to the impact in-creases, closure of the passages also extends to the lower heights of the ridges whereby the length of the throttling passages in which throttling action occurs increases.
:
Moreover, it is specially effective and advantageous if the length of the ridges equals at least one third of half the diameter of the supporting or load surface in the direction of the ridges. Starting from this minimum length of the ridges, the throttling passage~ will have a length which provides useful results in a great num-ber of applications.
It is also specially effective and advantageous if the fluid is silicone oil. Silicone oil is non-toxic and ;
useful over a wide temperature range from minus 70 to plus 200. Dimensioning the energy absorption action is simplified where silicone oil is used. ;~
'~' '''~
- 5 - ~ 9~4 If the damping device provided with the ridges accord-ing to the invention is subjected to a sudden load directed against it, what happens is as follows:
A pressure build-up occurs in the fluid whereby the fluid is accelerated towards the outside and fluid flow occurs through the ridge structure.
Simultaneously, due to the outer load applied, the -~
ridge structure is deformed, for instance, the outer ridge tips will be deflected; as the load increases, the flow passages continue to narrow, throttling action is produced and there will be a pressure build-up with energy consumption increasing exponentially. At the end of load application, the major portion of the fluid will have collected at the outer perimeter of the core, causing dilation of the diaphragm.
During the subsequent unloading, the ridge structure will rise again immediately; this and the force of the dilated diaphragm will cause the fluid to return into the cavity as unloading takes place.
:
It is especially effective and advantageous if more than two throttling passages are provided. A greater number, for instance more than three throttling pas-i` sages, will i~prove the effectiveness of the damping device.
:.
`~ The damping device according to the invention is de-signed to provide a gradually increasing damping pat-tern and to avoid a high initial oscillation. It is specially effective and advantageous if the core, the throttling passages and the diaphragm are matched up to give a paraboloidal damping characteristic. Such a damping characteristic, i.e. the variation of such a force plotted against time, is preferred for many ap-plications where a sudden load is applied to the load surface. ~ --;
2~97 Another specially effective and advantageous configura tion provides for the cavity to be bounded by an area of the diaphragm spanning the cavity and extending over a raised part forming the cavity as far as over the outer open-ings of the throttling passages. In this configuration, the fluid will return very quickly at the end of the impact from the dilated part of the di-aphragm at the outer openings of the throttling pas-sages via said raised part into the cavity.
The damping device according to the invention, espe-cially if it is formed with the ridges is a special asset when applied to the lower part, in particular the heel area, of a shoe. The damping device will improve the comfort of the shoe with simple means.
A preferred embodiment of the invention is illustrated in the drawing in which:
Figs. 1 - 4 each shows a cross-section through a damp-ing device for sudden loads in various phases of loading and unloading, Figs. 5 - 7 each shows a part of the damping device according to Fig. 1 under different loading conditions of the ridges and Fig. 8 shows the time-force characteristic at a supporting surface of the d~mping device with a shock load applied to the load sur-- face. ~ -~
The damping device according to Figs. 1 - 7 comprises a --single-piece core 1 which has a circular perimeter and, on one side, forms an uneven supporting surface 2 which -bears upon a base which is not shown. In the area of ~-~
the supporting surface, the core 1 forms a broken cir-cumferential raised part 4 which surrounds a dish-- - -- 7 ~ 097~
shaped cavity 5. The raised part g is formed by radi-ally extending ridges 16 which, at the center, leave a secondary space 17 clear and steadily increase in their height from the inside to the outer perimeter of the core 1 relative to a plane truncating core surface 18.
At the side of the core 1 opposite the supporting sur-face 2 there is provided a plane load surface 6 onto which a loading member which is not shown in detail is capable of acting as shown by the arrows 13. In the surface of the core 1 are provided a plurality of straight radially extending elongated throttling pas-sages which are open at one side and each of which is formed at the outer rim of the core with an outer opening 9 while its inner opening 10 is located in the central area of the dish-shaped depression 5 at its bottom [top] proximate to the secondary space 17. A
diaphragm 11 is provided which is attached to the load surface 6 with a flat joint which seals in the fluid.
The diaphragm 11 extends over the outer rim of the core 1 and the outer openings 9 provided in the latter and is undetatched to the core rim. As shown in Fig. 1, the diaphragm 11 is so~ewhat slack and has some clearance relative to the rim of the core while a clearance also exists relative to the crest of the raised part 4.
The throttling passages 8 are each bounded at the side by a ridge 16 whose cross-section is shown in Fig. 5.
Since the ridges 16 extend radially, the size of their contour increases from the inside towards the outer rim of the core 1. The cross-section of each ridge 16 de-creases as shown in Fig. 1 towards its tip or crest.
~ccording to Fig. 1, this decrease is relatively pro- -~
nounced and acute. It is also possible to adopt a rounded or trapezoidally decreasing cross-section. Each ridge 16 is formed with a little inclined flank 19 and a steeply inclined flank 20. ~
~:
, -- 8 - ~Q~097 At the rim face of the core, the diaphragm 11 extends not only with a loose contact, but slack with a clear-ance 21 to the crest of the raised part ~ and then, with its portion 12, covers the cavity 5. The cavity 5, the throttling passages 8 and the clearance space 21 are filled with a fluid, for instance, silicone oil.
When the loading member acts according to the arrows 13 suddenly or shock-like onto the damping device accord-ing to Fig. 1, then the core l together with its ridges 16 is stressed in compression, with the ridges being deformed as shown in Figs. 6 and 7. The volume of the cavity 5 is decreased and the throttling passages 8 are closed progressively starting on the outer rim of the . .
core 1 towards the inside and their cross-section i9 narrowed. Liquid is emitted at the outer openings 9 so that the diaphragm 11 is dilated in a radial direction as shown in Fig. 3 to form a convolution 14 which ex-tends all round. When, according to Fig. 4, unloading takes place after the impact, fluid returns through the throttling passages 8 which have their full, if only narrow, cross-section restored very quickly, with the ridges 16 rising into their upright position.
.
According to Figs. 1 - 4, the diaphragm 11 is made up of a disc-shaped portion and a cup~shaped portion which ;~
are tightly welded to each other along a peripheral area 22. As shown in Figs. 1 - 4, cover means 23 ex-tending over the passages 8 are formed by part of the diaphragm. It is conceivable to have two or more cores stacked in a common enclosing diaphragm in a manner -that the ridges of the one core contact the plane load ~-surface of the adjacent core when this load surface acts as a cover means.
Plotted in Fig. 8 i5 the force applied by the sudden load according to the arrows 13 and measured at the supporting surface 2 as a function of time. Transmis-sion of the sudden load is subject to damping action, :
/ - :
9 ~ 97~
i.e. the load will be transmitted without any initial peaks to the supporting surface 2 and rise steadily to its maximum value.
~
'~
-~ ' ''''' ~:' '' .
:, .
( :
.}
..
'!
',''''~"..
Claims (9)
- THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
l. Energy-absorbing damping device for shock loads wherein a core consists of an elastically deform-able material, is elastically compressible and bounds a cavity filled with fluid, wherein valve-less passages formed in the core extend from the cavity each formed with an outer opening at the outer perimeter of the core and forming a connec-tion with means yielding elastically to the fluid pressure, wherein hydraulic throttling devices are provided between the cavity and the elastically yielding means and wherein the core is formed with a supporting surface and a load surface which are opposite to each other, the passages extending substantially in the direction of these surfaces, characterized in that the passages are formed with a narrow cross-section to act as throttling pas-sages (8), in that the elastically yielding means is an elastically extensible diaphragm (11) which is attached all round with a sealing joint and covers the outer openings (9) of the throttling passages (8) in that the cavity (5) is bounded by a depression provided in the supporting surface or the load surface (2, 6) of the core (1), in that the throttling passages (8) at the load surface or supporting surface (2, 6) of the core (1) forming the depression are open at one side and have cover means (23) extending over them, and in that the throttling passages (8) are bounded at their sides by ridges (16) formed by the core (1), the cross-section of the ridges decreasing towards tips. - 2. Damping device as in Claim 1, characterized in that the ridges (16) whose cross-section reduces towards their tips have one flank (19) with a flatter rise than the other (20).
- 3. Damping device as in Claims 1 or 2, characterized in that the ridges (16) are located on a substan-tially plane truncation surface (18) of the core (1) and the height of the ridges (16) protruding from said truncation surface (18) increases in the direction towards the outer edge of the truncation surface, thus forming the depression.
- 4. Damping device as in Claims 1, 2 or 3, character-ized in that the length of the ridges (16) equals at least 1/3 of half the diameter of the support-ing or load surfaces (2, 6) extending in the di-rection of the ridge.
- 5. Damping device as in any one of the preceding claims, characterized in that the fluid is sili-cone oil.
- 6. Damping device as in any one of the preceding claims, characterized in that more than two throttling passages (8) are provided.
- 7. Damping device as in any one of the preceding claims, characterized in that the core (1), the throttling passages (8) and the diaphragm (11) are matched to produce a paraboloidal damping charac-teristic.
- 8. Damping device as in any one of the preceding claims, characterized in that the cavity (5) is bounded by a portion (12) of the diaphragm (11) spanning the depression, the diaphragm extending over a raised part (4) forming the shallow de-pression to a point beyond the outer openings (9) of the throttling passages (8).
- 9. Application of the damping device as in any one of the claims 1 to 8 to the lower part, in particular the heel zone, of a shoe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3906466A DE3906466A1 (en) | 1988-05-13 | 1989-03-01 | DAMPING DEVICE FOR SHOCKING LOADS |
| DEP3906466.2-12 | 1989-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2010974A1 true CA2010974A1 (en) | 1990-09-01 |
Family
ID=6375236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2010974 Abandoned CA2010974A1 (en) | 1989-03-01 | 1990-02-27 | Damping device for shock loads |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2010974A1 (en) |
| ES (1) | ES2021208A6 (en) |
-
1990
- 1990-02-27 CA CA 2010974 patent/CA2010974A1/en not_active Abandoned
- 1990-03-01 ES ES909000592A patent/ES2021208A6/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2021208A6 (en) | 1991-10-16 |
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