GB2179235A - Sprung footwear - Google Patents
Sprung footwear Download PDFInfo
- Publication number
- GB2179235A GB2179235A GB08618438A GB8618438A GB2179235A GB 2179235 A GB2179235 A GB 2179235A GB 08618438 A GB08618438 A GB 08618438A GB 8618438 A GB8618438 A GB 8618438A GB 2179235 A GB2179235 A GB 2179235A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sprung
- ground
- footwear
- engaging member
- platform
- 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.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B25/00—Stilts or the like
- A63B25/10—Elastic bouncing shoes fastened to the foot
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/181—Resiliency achieved by the structure of the sole
- A43B13/182—Helicoidal springs
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/181—Resiliency achieved by the structure of the sole
- A43B13/183—Leaf springs
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/181—Resiliency achieved by the structure of the sole
- A43B13/184—Resiliency achieved by the structure of the sole the structure protruding from the outsole
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2208/00—Characteristics or parameters related to the user or player
- A63B2208/12—Characteristics or parameters related to the user or player specially adapted for children
Abstract
Sprung footwear (2) comprising a foot-supporting platform (4), a ground-engaging member (12), and at least one coil spring (14, 16) positioned between the platform (4) and the ground-engaging member (12). The ground- engaging member may be curved and is secured to the foot-supporting platform by pivot members (22, 40). The foot-supporting platform may provide straps for attachment to a foot or shoe or may have an integral shoe. <IMAGE>
Description
SPECIFICATION
Sprung Footwear
This invention relates to sprung footwear.
Fun articles, for example for children, are always in demand by manufacturing and selling organisations, and it is the aim of the present invention to provide one such article.
Accordingly, this invention provides sprung footwear comprising a platform for supporting a foot of a person, a ground-engaging member, and at least one coil spring positioned between the platform and the ground-engaging member.
Preferaably, the ground-engaging member is curved for enabling the person to walk or run with the sprung footwear on their foot, and is made of a resilient material for enabling the ground-engaging member to flex and return to its original condition when subjected to a bouncing action by a person with the sprung footwear on their foot.
Children or indeed adults if desired, can walk, run and generally play about with the sprung footwear on each foot. The ground-engaging member with its curved shape gives good mobility. When the person jumps up and down, the coil spring or the coil springs give a spring board effect enabling the person to spring off the ground to varying heights dependent upon the force with which the spring or the springs are compressed. The ground-engaging member flexes under the bouncing action and the ground-engaging member may also assist in providing an upward springing motion.
In one embodiment of the invention, each end of the ground-engaging member is secured to the platform by at least one pivotable link member.
Each end ofthe ground-engaging member may be secured to the platform by a pair of the pivotable link member.
Each pivotable link member may be connected at its end to the ground-engaging member by a pivot member which is locatable in a slot in the pivotable link member, the slot enabling the pivot member to move in the slot as the ground-engaging member returns to its original condition after having been flexed thereby reducing on energy lost being absorbed into the pivotable link member and the platform. Usually, the pivot member will be a bolt but the pivot member could be a pin or other device.
In another embodiment of the invention, one end of the ground-engaging member is secured to the platform by a pivotable link member, and the other end ofthe ground-engaging member is pivotally connected directly to the platform.
In a further embodiment of the invention, one end ofthe ground-engaging member is pivotally connected directly to the platform, and the other end of the ground-engaging member is releasably clipped to a front portion of the platform.
In all the various embodiments of the invention, there may be only one coil spring.
When only one coil spring is employed, the coil spring will usually extend between the platform and the ground-engaging member. The coil spring will also usually be substantially centrally positioned, although the coil spring may sometimes with advantage be positioned slightly nearer the front part of the sprung footwear than the rear part of the sprung footwear.
The spring may be secured in position at its end adjacent the platform, for example by clips or abutments.
If desired, there may be two coil spring employed in the sprung footwear and in this case, one coil spring may be positioned inside the other coil spring, the outer coil spring extending between the platform and the ground-engaging member, and the inner coil spring being shorter than the outer coil spring.
Where two such coil springs are employed, then the inner coil spring preferably extends downwardly from the platform and terminated remotes from the ground-engaging member.
The ground-engaging member may have a centrally positioned sole portion which is flat and which has the effect of reducing rocking of the footwear during use.
The ground-engaging member may also have a central extension portion to one or both of its sides which has the effect of reducing side ways tilting of the footwear during use.
Usually, there will only be one centrally positioned extension portion and this will be provided on the outside of the sprung footwear as worn. It will be appreciated that too large a centrally positioned extension portion on the inside of the sprung footwear as worn could tend to catch the user's ankle during jumping movements.
The sprung footwear will usually including fixing means for fixing the sprung footwear to a shoe.
The fixing means are preferably straps but other devices such for example as laces may be employed.
Advantageously, the fixing means includes a toe cap for providing good location for the toe of a shoe.
If desired, in an alternative construction, the sprung footwear may be provided with an integral shoe. The integral shoe may of course be of any appropriate size, type and colour.
The sprung footwear may be made of various desired materials. The platform and the groundengaging member may be made of a metal of a plastics materials. Where a metal is employed, then the metal should advantageously be as light as possible whilst not prematurely becoming damaged during normal use. Plastics materials may be preferred since they can be easily moulded to shape and they are light. Where plastics materials are employed, then, at least for the ground-engaging member, the plastics materials chosen must have the required degree of flexibility. Similarly, the plastics materials should not crack or otherwise break during normal use and it may be desirable to employ reinforced plastics materials such for example as carbon fibre reinforced plastics materials. Glass fibre reinforced plastics materials may also be employed.Different materials may be employed for different parts of the sprung footwear.
The coil spring or the coil springs will usually be mde of a metal such as spring steel.
Embodiments of the invention will now be described solely by way of example and with
reference to the accompanying drawings in which:
Figure 1 is a side view of first sprung footwear;
Figure 2 is a side view of second sprung footwear;
Figure 3 is a side view of third sprung footwear;
Figure 4 is a side view of fourth sprung footwear;
Figure 5 is a front view of the sprung footwear shown in Figure 4 in its non-flexed condition;
Figure 6 is a view like that shown in Figure 5 but with the ground-engaging member removed for clarity of illustration;
Figure 7 is a rear view of the sprung footwear shown in Figure 1;
Figure 8 is a side view of fifth sprung footwear;
Figures 9 and 10 are enlarged views of two different parts of the sprung footwear of Figure 8; and
Figure 11 shows part of sixth sprung footwear.
Referring to Figure 1,there is shown sprung footwear 2 comprising a platform 4. The platform 4 comprises a metal or plastics material base layer 6 which is overlaid with a cork or rubber layer 8. If metal is employed for the base layer 6, then this may be aluminium. The platform 4 is for supporting the foot 10 of a person.
The sprung footwear 2 also comprises a groundengaging member 12 which is made of sprung steel and may be regarded as a leaf spring. The groundengaging member 12 is curved as shown for enabling the person to walk or run with the sprung footwear 2 on each foot. The ground-engaging member 12 generally has to be made of a resilient material in order to enable itto flex and return to its original condition when subjected to a bouncing action by the person with the sprung footwear 2 on each of their feet.
The bouncing action of the sprung footwear 2 is afforded by an outer coil spring 14 and an inner coil spring 16. It will be seen that the outer coil spring 14 extends between the platform 4 and the groundengaging member 12. The outer coil spring 14 is substantially centrally placed in the sprung footwear 2. The top end of the outer coil spring 14 adjacent the platform 4 is held in position by a pair of side plates, one of which is shown as side plate 18. Each side plate is attached to the platform 4 by a pair of screws 20.
The inner coil spring 16 is secured to the platform and it extends downwardly from the platform 4 but does not engage the ground-engaging member 12.
The inner coil spring 16 thus comes into play towards the end of the compressive stroke of the outer coil spring 14 and may be effective to give greater bounce than with a single coil spring. It will be noted that the spirais of the outer coil spring 14 extend in the opposite direction to the spirals of the inner coil spring 16 and this is to ensure that the spirals of each of the coil springs 14, 16 do not get trapped between each other during compression.
The coil springs 14, 16 can easily be removed if desired to be replaced by heavier or lighter springs as may be desired so that manufacturers can manufacture a range of articles for use by persons of different ages and weights.
The ground-engaging member 12 is connected at
each of its ends to the platform 4 by a pair of
pivotable link members 22. Thus, at each end of the
platform 4, there are a pair of the pivotable link
members 22, each pair of pivotable link members 22
being arranged one on either side of the platform 4.
The upper ends of the pivotable link members 22 are
pivotally connected to the platform 4 by means of
pivot bolts 24. The lower ends of the pivotable link
members 22 are connected to the ground-engaging
member 12 by pivot bolts 26 which are located each
in a slot 28 in the pivotable link members 22. The
slots 28 enable the pivot bolts 26 to move in the slot as the ground-engaging member 12 returns to its
original condition after having been flexed and may
be effective to reduce on the loss of energy which is absorbed into the pivotable link members 22 and the platform 4.
Referring now to Figure 2, similar parts as in
Figure 1 have been given the same reference
numerals and their precise construction and operation will not again be given. In Figure 2, it will
be seen that only the coil spring 14 is employed and the coil spring 16 has been omitted.
It will also be seen from Figure 2 that the groundengaging member 12 is provided with a centrally positioned sole portion 30. The sole portion 30 may advantageously be made of rubber although it can be made of other materials such for example as metals or plastics materials. The sole portion 30 has a flat bottom surface 32 as shown and the sole portion 30 may be effective to reduce rocking of the sprung footwear 2 during use. Obviously, it is not desired to prevent total rocking of the sprung footwear 2 but the sole portion 30 may be effective to prevent too much rocking and thus give the wearer of the sprung footwear 2 greater confidence when standing still.
Referring now to Figure 3, similar parts as in
Figure 1 have again been given the same reference numerals and their precise construction and operation will not again be given. In Figure 3 it will be seen that only one coil spring 14 is employed.
Also in Figure 3 only one pivotable link member 22 is employed, this being at the front of the sprung footwear 2. The pivotable link member 22 as shown shown in Figure 3 has a pivot bolt 26 which passes through a bent over portion 34 of the groundengaging member 12.
The ground-engaging member 12 is also bent over at the rear of the footwear 2 to form another bent over portion 36. This bent over portion 36 receives a pivot bolt in the aperture 38 so that the ground-engaging member 12 can be connected to the platform 4 using the illustrated lug 40. There will be one lug 40 on either side of the platform 4 at the rear of the sprung footwear 2.
Figure 3 also illustrates that the sprung footwear is provided with fixing means in the form of a strap 42 and a toe cap 44 for securing the shoe 10 to the upper surface of the platform 4. The toe cap 44 provides a secure method of locating the shoe 10.
The strap 42 can be tightened as required using the illustrated buckle 46.
Referring now to Figures 4to 7, similar parts as in previous Figures have been given the same reference numerals and their precise construction and operation will not again be given. In Figure 4, it will be seen that an extra strap 48 is employed for holding the shoe 10 in position.
It will be seen from Figure 4 that the front of the ground-engaging member 12 clips via the bent over clip 50 over the front of the platform 4. The appropriate part of the ground-engaging member 12 runs over a roller 54 and is guided by a return bar 56 as illustrated most clearly in Figure 6. Figure 7 shows a pivot bolt 58 extending through the aperture 38 in the lug 40.
In the depressed condition of the sprung footwear 2 as shown in Figure 4, the ground-engaging member 12 will unclip from the front 52 of the platform 4 and this is illustrated in figure 4 with a second and lower ground-engaging member 12 which is in fact the same as the upper illustrated ground-engaging member 12 but is just in a different condition.
The design shown in Figures 8 to 10 does away with the need for longer spring hangers, and it incorporates them directly in both leaf springs 12, 62 making for an easier assembly.
The coil spring 14 or springs are preferably conical types of springs. They are housed as shown in between the two leaf springs 12, 62 with the platform 4 housed on top by a pin 64 or the like, to hold the platform 4 to the leaf spring 62.
The platform 4 can be telescopic for variation in sizes of feet.
To prevent too much rocking of the platform 4 on the curved leaf spring 62, a stop 62 at each end of the platform 4 is provided. Alternatively, a moulded flat top 68 on the top leaf spring may be employed.
Figure 10 shows in detail the hinge hangers 70. As will be seen, a pivot bolt 72 passes through each hinge hanger 70.
Figure 11 shows part of sprung footwear in which a coil spring 14 is positioned between a ground engaging member 12 and an intermediate member 12A which is like the ground-engaging member 12 and which may replace the pivotable link members 22. The construction shown in Figure 11 can be used with a light spring 14, as the intermediate member 12A may assist in providing a spring effect.
It is to be appreciated that the embodiments of the invention described above have been given by way of example only and that modifications may be effected. Thus, the various articles of sprung footwear 2 as illustrated may be altered in design.
They may be made in various sizes to suit different sizes and weights of children and adults. If desired, the fixing means such for example as the straps 42, 48 and the toe cap may be dispensed with and the shoe 10 may be permanently secured to the platform 4 in the manner of ice skates. Obviously, different sizes of shoe 10 will then be required. The shoes 10 employed may be any type of footwear including long boots, short boots and trainers. An adjustable base plate, for example a sliding telescopic base plate, may also be made for different sizes of foot, incorporating a heel stop 60 at the rear of the base plate to stop the foot from sliding backwards, see Figure 4. The sprung footwear may include battery operated light means for flashing on and off as jumping occurs and there may be a green light at the front of the sprung footwear and a red light at the rear of the sprung footwear. The stop 66 may be on the underside of the the platform 4 instead of on top of the leaf spring 62. The sprung footwear may also include a pneumatic spring or springs instead of a coil spring or springs. The spring or springs may also be conical.
Claims (19)
1. Sprung footwear comprising a platform for supporting a foot of a person, a ground-engaging member, and at least one coil spring positioned between the platform and the ground-engaging member.
2. Sprung footwear according to claim 1 in which the ground engaging member is curved for enabling the person to walk or run with the sprung footwear on their foot, and is made of resilient material for enabling the ground-engaging member to flex and return to its original condition when subjected to a bouncing action by the person with the sprung footwear on their foot.
3. Sprung footwear according to claim 2 in which each end of the ground-engaging member is secured to the platform by at least one pivotable link member.
4. Sprung footwear according to claim 3 in which each end of the groung-engaging member is secured to the platform by a pair of the pivotable link members.
5. Sprung footwear according to claim 3 or claim 4 in which each pivotable link member is connected at its end to the groung-engaging member by a pivot member which is locatable in a slot in the pivotable link member, the slot enabling the pivot member to move in the slot as the ground-engaging member returns to its original condition after having been flexed thereby reducing on energy lost by being absorbed into the pivotable link member and the platform.
6. Sprung footwear according to claim 2 in which one end of the ground-engaging member is secured to the platform by a pivotable link member, and the other end of the ground-engaging member is pivotally connected directly to the platform.
7. Sprung footwear according to claim 2 in which the ground-engaging member is pivotally connected directly to the platform, and the other end of the ground-engaging member is releasably clipped to a front portion of the platform.
8. Sprung footwear according to any one of claims 2 to 7 in which there is only one coil spring.
9. Sprung footwear according to claim 8 in which the coil spring extends between the platform and the ground-engaging member.
10. Sprung footwear according to claim 8 or claim 9 in which the spring is held in position at its end adjacent the platform by clips or abutments.
11. Sprung footwear according to any of claims 1 to 8 in which there are two coil springs, there being one coil spring positioned inside the other coil spring, the outer coil spring extending between the platform and the ground-engaging member, and the inner coil spring being shorter than the outer coil.
12. Sprung footwear according to claim 11 in which the inner coil extends downwardly from the platform and terminates remote from the groundengaging member.
13. Sprung footwear according to any one of the prededing claims in which the ground engaging member has a centrally positioned sole portion which is flat and which has the effect of reducing rocking of the footwear during use.
14. Sprung footwear according to any one of the preceding claims in which the ground-engaging member has a central extension portion to one or both of its sides which has the effect of reducing side ways tilting of the footwear during use.
15. Sprung footwear according to any one of the preceding claims and including fixing means for fixing the sprung footwear to a shoe.
16. Sprung footwear according to claim 15 in which the fixing means are straps.
17. Sprung footwear according to claim 15 or claim 16 in which the fixing means includes a toe cap for providing good location for the toe of a shoe.
18. Sprung footwear according to any one of claims 1 to 14 and having an integral shoe.
19. Sprung footwear substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8618438A GB2179235B (en) | 1985-08-19 | 1986-07-29 | Sprung footwear |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB858520674A GB8520674D0 (en) | 1985-08-19 | 1985-08-19 | Spring shoes |
| GB858526914A GB8526914D0 (en) | 1985-08-19 | 1985-10-31 | Sprung footwear |
| GB858527727A GB8527727D0 (en) | 1985-11-11 | 1985-11-11 | Sprung footwear |
| GB8618438A GB2179235B (en) | 1985-08-19 | 1986-07-29 | Sprung footwear |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8618438D0 GB8618438D0 (en) | 1986-09-03 |
| GB2179235A true GB2179235A (en) | 1987-03-04 |
| GB2179235B GB2179235B (en) | 1989-09-20 |
Family
ID=27449687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8618438A Expired GB2179235B (en) | 1985-08-19 | 1986-07-29 | Sprung footwear |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2179235B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055185A3 (en) * | 1997-06-05 | 1999-04-08 | Jjco Inc | Exercise boot |
| WO1999051118A1 (en) * | 1998-04-03 | 1999-10-14 | Charles Ogilvie Wood | Shock absorbing device for a shoe |
| AU753143B2 (en) * | 1997-06-05 | 2002-10-10 | Jjco Inc. | Exercise boot |
| US6684531B2 (en) | 2001-12-27 | 2004-02-03 | Brian G. Rennex | Spring space shoe |
| WO2007137834A1 (en) * | 2006-05-30 | 2007-12-06 | Timo Azadi | Roller skate comprising a curved damping element |
| FR2974732A1 (en) * | 2011-05-03 | 2012-11-09 | Marc Neff | Strengthening device for strengthening arch of foot of user for e.g. learning ballet, has straps for attaching pair of curved boards to feet of user, where radius of curvature of each board is variable depending on size of foot of user |
| CN102920095A (en) * | 2012-11-20 | 2013-02-13 | 吴伟健 | Novel space shoes |
| CN112190913A (en) * | 2020-10-10 | 2021-01-08 | 重庆第二师范学院 | Roller skating structure with bounce assisting force and limit roller skating shoe |
| WO2021205006A1 (en) | 2020-04-09 | 2021-10-14 | Dieter Mankau | Footwear midsole and running shoe produced therewith |
| DE102020002235A1 (en) | 2020-04-09 | 2021-10-14 | Dieter Mankau | Spring entry element |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB216376A (en) * | 1923-07-03 | 1924-05-29 | Joseph Oddy | Improvements in or relating to shoes for athletes and the like |
| GB360255A (en) * | 1930-04-23 | 1931-11-05 | Karl Fleckenstein | Improvements in or relating to tension and compression spring means |
| GB466357A (en) * | 1935-11-26 | 1937-05-26 | Walter Miller Metcalf | Improvements in or relating to devices to facilitate walking |
| GB980145A (en) * | 1963-01-31 | 1965-01-13 | Christopher Collaro | Improvements relating to recreational apparatus |
| EP0103041A1 (en) * | 1982-09-14 | 1984-03-21 | Joachim Dr. Schnell | Spring-loaded running and jumping shoe |
| US4492374A (en) * | 1981-04-21 | 1985-01-08 | David Lekhtman | Sporting and exercising spring shoe |
-
1986
- 1986-07-29 GB GB8618438A patent/GB2179235B/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB216376A (en) * | 1923-07-03 | 1924-05-29 | Joseph Oddy | Improvements in or relating to shoes for athletes and the like |
| GB360255A (en) * | 1930-04-23 | 1931-11-05 | Karl Fleckenstein | Improvements in or relating to tension and compression spring means |
| GB466357A (en) * | 1935-11-26 | 1937-05-26 | Walter Miller Metcalf | Improvements in or relating to devices to facilitate walking |
| GB980145A (en) * | 1963-01-31 | 1965-01-13 | Christopher Collaro | Improvements relating to recreational apparatus |
| US4492374A (en) * | 1981-04-21 | 1985-01-08 | David Lekhtman | Sporting and exercising spring shoe |
| EP0103041A1 (en) * | 1982-09-14 | 1984-03-21 | Joachim Dr. Schnell | Spring-loaded running and jumping shoe |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055185A3 (en) * | 1997-06-05 | 1999-04-08 | Jjco Inc | Exercise boot |
| AU753143B2 (en) * | 1997-06-05 | 2002-10-10 | Jjco Inc. | Exercise boot |
| WO1999051118A1 (en) * | 1998-04-03 | 1999-10-14 | Charles Ogilvie Wood | Shock absorbing device for a shoe |
| US6684531B2 (en) | 2001-12-27 | 2004-02-03 | Brian G. Rennex | Spring space shoe |
| WO2007137834A1 (en) * | 2006-05-30 | 2007-12-06 | Timo Azadi | Roller skate comprising a curved damping element |
| FR2974732A1 (en) * | 2011-05-03 | 2012-11-09 | Marc Neff | Strengthening device for strengthening arch of foot of user for e.g. learning ballet, has straps for attaching pair of curved boards to feet of user, where radius of curvature of each board is variable depending on size of foot of user |
| CN102920095A (en) * | 2012-11-20 | 2013-02-13 | 吴伟健 | Novel space shoes |
| CN102920095B (en) * | 2012-11-20 | 2014-11-05 | 吴伟健 | Novel space shoes |
| WO2021205006A1 (en) | 2020-04-09 | 2021-10-14 | Dieter Mankau | Footwear midsole and running shoe produced therewith |
| DE102020002235A1 (en) | 2020-04-09 | 2021-10-14 | Dieter Mankau | Spring entry element |
| CN112190913A (en) * | 2020-10-10 | 2021-01-08 | 重庆第二师范学院 | Roller skating structure with bounce assisting force and limit roller skating shoe |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2179235B (en) | 1989-09-20 |
| GB8618438D0 (en) | 1986-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |