CA2795581C - Shock absorber insert for a walking aid - Google Patents
Shock absorber insert for a walking aid Download PDFInfo
- Publication number
- CA2795581C CA2795581C CA2795581A CA2795581A CA2795581C CA 2795581 C CA2795581 C CA 2795581C CA 2795581 A CA2795581 A CA 2795581A CA 2795581 A CA2795581 A CA 2795581A CA 2795581 C CA2795581 C CA 2795581C
- Authority
- CA
- Canada
- Prior art keywords
- shock absorber
- piston rod
- piston
- walking aid
- piston cylinder
- 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.)
- Active
Links
- 230000035939 shock Effects 0.000 title claims abstract description 74
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 65
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 230000002618 waking effect Effects 0.000 claims 2
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 8
- 239000004411 aluminium Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 210000001099 axilla Anatomy 0.000 description 4
- 241001166076 Diapheromera femorata Species 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 206010002329 Aneurysm Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000018982 Leg injury Diseases 0.000 description 1
- 206010061225 Limb injury Diseases 0.000 description 1
- 241000253999 Phasmatodea Species 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001398 aluminium Chemical class 0.000 description 1
- 210000000617 arm Anatomy 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 210000002310 elbow joint Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005021 gait Effects 0.000 description 1
- 210000004247 hand Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 208000009873 radial neuropathy Diseases 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 210000002832 shoulder Anatomy 0.000 description 1
- 210000000323 shoulder joint Anatomy 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H3/00—Appliances for aiding patients or disabled persons to walk about
- A61H3/02—Crutches
- A61H3/0277—Shock absorbers therefor
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B9/00—Details
- A45B9/04—Ferrules or tips
Landscapes
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Pain & Pain Management (AREA)
- Physical Education & Sports Medicine (AREA)
- Rehabilitation Therapy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Rehabilitation Tools (AREA)
Abstract
The present invention relates to shock absorber insert for retro fitment into the body of an existing walking aid, such as a crutch, to dampen the impact force between the walking aid and a ground surface. Known shock absorbing walking aids can be relatively expensive to manufacture, heavy to use and do not provide for adjustment of the shock absorber. The shock absorber insert (1) of the present invention comprises a piston cylinder (11) with an end wall (11A); a piston (5) which moves axially within the piston cylinder (11) and a damper (10) located on a piston rod (9) and abut the end wall (11A) to reduce the speed of movement of the piston rod (9) within the piston cylinder (11). The shock absorber insert is either mid mounted between an upper (2) and lower (3) shaft or bottom mounted into a lower end of the lower (3) shaft.
Description
SHOCK ABSORBER INSERT FOR A WALKING AID
TECHNICAL FIELD
This invention relates to a shock absorber insert for a walking aid. More particularly, this invention relates to a shock absorber insert configured for retro fitment by insertion into the body of an existing walking aid such as a crutch to dampen the impact force between the walking aid and a ground surface.
BACKGROUND ART
The use of walking aids such as walking sticks, elbow crutches or axilla (underarm) crutches by users with short or long term leg injury is commonplace.
As the tip of the walking aid is placed on a ground surface during walking a large load is transmitted to the upper body (at the hands, wrists, arms, shoulder, back, neck or joints such as elbow joints or shoulder joints), which can result in upper body pain and/or fatigue which in turn may lead to crutch palsy, aneurysms, thrombosis or other serious conditions.
In an effort to damp the impact force resulting from the load transmitted to the user during walking, walking aids incorporating shock absorbers have been developed. These known shock absorbing crutches include dedicated spring-loaded crutches where the shock absorber is permanently integrated into the crutch body and which requires the user to purchase and use the spring-loaded crutch in preference to the traditional rigid crutch.
Our Ref: 236016PCT/53 The disadvantages associated with the use of dedicated shock absorbing crutches include the extra expense of purchasing the new crutch, the increased weight of the crutch which can affect manoeuvrability and the inconvenience of using a shock absorbing crutch on ground surfaces which do not require shock absorption and which can lead to instability for the user.
More recently, conversion kits have been developed to fit to existing crutches.
US 7,395,829 titled "Shock Absorber Crutch and Shock Absorber Kit" discloses a spring loaded shock absorber which clamps onto the lower end of the body of the crutch.
US 6,055,998 titled "Shock Absorbing Fixture" discloses a spring loaded shock absorber which is removably fitted into the lower end of the body of the crutch.
US2005/0129456 titled "Crutch Apparatus and Method" discloses the use of a gel shock insert (rather than a spring) located between a fixed tube stop and a plug located in a slide tube slidingly engaged with the fixed tube.
However, the shock absorbers disclosed in the documents outlined above suffer from one or more of the following disadvantages:
= Attachment of the shock absorber to the body of the crutch can require the use of tools and therefore be inconvenient to convert between a shock absorbing crutch and a rigid crutch;
= Multiple individual parts can make fitment of the crutch with the shock absorber inconvenient;
= Attachment of the shock absorber to the body of the crutch can affect the integrity of the body of the crutch and therefore present a danger of failure of the crutch during use; and = The lack of adjustability of the shock absorber can make use of the shock
TECHNICAL FIELD
This invention relates to a shock absorber insert for a walking aid. More particularly, this invention relates to a shock absorber insert configured for retro fitment by insertion into the body of an existing walking aid such as a crutch to dampen the impact force between the walking aid and a ground surface.
BACKGROUND ART
The use of walking aids such as walking sticks, elbow crutches or axilla (underarm) crutches by users with short or long term leg injury is commonplace.
As the tip of the walking aid is placed on a ground surface during walking a large load is transmitted to the upper body (at the hands, wrists, arms, shoulder, back, neck or joints such as elbow joints or shoulder joints), which can result in upper body pain and/or fatigue which in turn may lead to crutch palsy, aneurysms, thrombosis or other serious conditions.
In an effort to damp the impact force resulting from the load transmitted to the user during walking, walking aids incorporating shock absorbers have been developed. These known shock absorbing crutches include dedicated spring-loaded crutches where the shock absorber is permanently integrated into the crutch body and which requires the user to purchase and use the spring-loaded crutch in preference to the traditional rigid crutch.
Our Ref: 236016PCT/53 The disadvantages associated with the use of dedicated shock absorbing crutches include the extra expense of purchasing the new crutch, the increased weight of the crutch which can affect manoeuvrability and the inconvenience of using a shock absorbing crutch on ground surfaces which do not require shock absorption and which can lead to instability for the user.
More recently, conversion kits have been developed to fit to existing crutches.
US 7,395,829 titled "Shock Absorber Crutch and Shock Absorber Kit" discloses a spring loaded shock absorber which clamps onto the lower end of the body of the crutch.
US 6,055,998 titled "Shock Absorbing Fixture" discloses a spring loaded shock absorber which is removably fitted into the lower end of the body of the crutch.
US2005/0129456 titled "Crutch Apparatus and Method" discloses the use of a gel shock insert (rather than a spring) located between a fixed tube stop and a plug located in a slide tube slidingly engaged with the fixed tube.
However, the shock absorbers disclosed in the documents outlined above suffer from one or more of the following disadvantages:
= Attachment of the shock absorber to the body of the crutch can require the use of tools and therefore be inconvenient to convert between a shock absorbing crutch and a rigid crutch;
= Multiple individual parts can make fitment of the crutch with the shock absorber inconvenient;
= Attachment of the shock absorber to the body of the crutch can affect the integrity of the body of the crutch and therefore present a danger of failure of the crutch during use; and = The lack of adjustability of the shock absorber can make use of the shock
2 =
absorbing crutch limited over different surfaces or with users of different weight.
It is an object of the present invention to address the foregoing problems or at least to provide the public with a useful choice.
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only.
It is acknowledged that the term 'comprising' may, under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, the term 'comprising' shall have an inclusive meaning - i.e. that it will be taken to mean an inclusion of not only the listed components it directly references, but also other non-specified components or elements. This rationale will also be used when the term 'comprised' or 'comprising' is used in relation to one or more steps in a method or process.
DISCLOSURE OF INVENTION
According to a first aspect of the present invention there is provided a shock absorber insert for a walking aid comprising:
absorbing crutch limited over different surfaces or with users of different weight.
It is an object of the present invention to address the foregoing problems or at least to provide the public with a useful choice.
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only.
It is acknowledged that the term 'comprising' may, under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, the term 'comprising' shall have an inclusive meaning - i.e. that it will be taken to mean an inclusion of not only the listed components it directly references, but also other non-specified components or elements. This rationale will also be used when the term 'comprised' or 'comprising' is used in relation to one or more steps in a method or process.
DISCLOSURE OF INVENTION
According to a first aspect of the present invention there is provided a shock absorber insert for a walking aid comprising:
3 Our Ref: 236016PCT/53 = a piston cylinder comprising an abutment surface;
= a piston rod configured to move axially within the piston cylinder; and = a damper configured to be located on the piston rod and abut the abutment surface to reduce the speed of movement of the piston rod within the piston cylinder wherein the shock absorber insert is configured to be removably fitted into an internal space of at least one support member of the walking aid.
It is acknowledged for the purposes of the specification that the term "walking aid"
means an elbow crutch, underarm (axilla) crutch, walking stick, cane, ski pole, walking frame, prosthetic leg, prosthetic foot or the like.
Preferably, the piston cylinder and piston rod are configured to enable the damper to be interchangeable with a similar damper of different shore hardness.
More preferably, a portion of the piston rod is located within the piston cylinder with an attachment means.
More preferably still, the attachment means is a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
Preferably, the clip is an R-clip. Preferably, the damper is manufactured from a moulded material. More preferably, the damper is manufactured from polyurethane.
Preferably, the shock absorber insert is configured to be removably fitted into a lower end of the support member which contacts a ground surface during use of the walking aid.
More preferably, the shock absorber insert is configured to be friction fitted within a
= a piston rod configured to move axially within the piston cylinder; and = a damper configured to be located on the piston rod and abut the abutment surface to reduce the speed of movement of the piston rod within the piston cylinder wherein the shock absorber insert is configured to be removably fitted into an internal space of at least one support member of the walking aid.
It is acknowledged for the purposes of the specification that the term "walking aid"
means an elbow crutch, underarm (axilla) crutch, walking stick, cane, ski pole, walking frame, prosthetic leg, prosthetic foot or the like.
Preferably, the piston cylinder and piston rod are configured to enable the damper to be interchangeable with a similar damper of different shore hardness.
More preferably, a portion of the piston rod is located within the piston cylinder with an attachment means.
More preferably still, the attachment means is a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
Preferably, the clip is an R-clip. Preferably, the damper is manufactured from a moulded material. More preferably, the damper is manufactured from polyurethane.
Preferably, the shock absorber insert is configured to be removably fitted into a lower end of the support member which contacts a ground surface during use of the walking aid.
More preferably, the shock absorber insert is configured to be friction fitted within a
4 Our Ref: 236016PCT/53 lower end of the support member.
More preferably, the shock absorber insert also comprises a foot which is configured to contact a ground surface during use of the walking aid and be removably fitted on an end of the piston rod extending from the piston cylinder.
Preferably, the shock absorber insert is configured to be removably fitted between an upper and lower support member of the walking aid.
More preferably, the piston rod is configured to be reversibly fitted to the upper support member via a nib-spring locating in at least one aperture of an upper portion of the piston rod and at least one aperture of the upper support member.
According to another aspect of the present invention there is provided a kit which can be readily assembled into a shock absorber insert for a walking aid comprising:
= a piston cylinder comprising an abutment surface;
= a piston rod configured to move axially within the piston cylinder;
= at least one damper, each damper configured to be located on the piston rod and abut the abutment surface and reduce the speed of movement of the piston rod within the piston cylinder;
wherein the shock absorber insert is configured to be removably fitted into an internal space of at least one support member of the walking aid.
Preferably, the damper is interchangeable with a similar damper of different shore hardness.
Preferably, the kit also comprises an attachment means configured to locate the piston rod within the piston cylinder.
BRIEF DESCRIPTION OF DRAWINGS
More preferably, the shock absorber insert also comprises a foot which is configured to contact a ground surface during use of the walking aid and be removably fitted on an end of the piston rod extending from the piston cylinder.
Preferably, the shock absorber insert is configured to be removably fitted between an upper and lower support member of the walking aid.
More preferably, the piston rod is configured to be reversibly fitted to the upper support member via a nib-spring locating in at least one aperture of an upper portion of the piston rod and at least one aperture of the upper support member.
According to another aspect of the present invention there is provided a kit which can be readily assembled into a shock absorber insert for a walking aid comprising:
= a piston cylinder comprising an abutment surface;
= a piston rod configured to move axially within the piston cylinder;
= at least one damper, each damper configured to be located on the piston rod and abut the abutment surface and reduce the speed of movement of the piston rod within the piston cylinder;
wherein the shock absorber insert is configured to be removably fitted into an internal space of at least one support member of the walking aid.
Preferably, the damper is interchangeable with a similar damper of different shore hardness.
Preferably, the kit also comprises an attachment means configured to locate the piston rod within the piston cylinder.
BRIEF DESCRIPTION OF DRAWINGS
5 Our Ref: 236016PCT/53 Further aspects of the present invention will become apparent from the following=
description which is given by way of example only and with reference to the accompanying drawings in which:
Figure 1 shows an exploded view of a first pre ferred embodiment of the present invention in the form of a shock absorber insert for a walking aid;
Figure 2 shows a side perspective view of the embodiment shown in Figure 1 assembled;
Figure 3 shows an exploded view of a second preferred embodiment of the present invention in the form of a shock absorber insert for a walking aid;
Figure 4 shows a side perspective view of the embodiment shown in Figure 3 assembled;
Figure 5 shows an end perspective view of the embodiment shown in Figure 3;
Figures 6A-C show steps in the fitting of the embodiment shown in Figure 1 to an elbow crutch;
Figures 7A-C show steps in the fitting of the embodiment shown in Figure 3 to an axilla crutch; and Figures 8A-C show steps in the fitting of the embodiment shown in Figure 3 to a walking stick.
BEST MODES FOR CARRYING OUT THE INVENTION
description which is given by way of example only and with reference to the accompanying drawings in which:
Figure 1 shows an exploded view of a first pre ferred embodiment of the present invention in the form of a shock absorber insert for a walking aid;
Figure 2 shows a side perspective view of the embodiment shown in Figure 1 assembled;
Figure 3 shows an exploded view of a second preferred embodiment of the present invention in the form of a shock absorber insert for a walking aid;
Figure 4 shows a side perspective view of the embodiment shown in Figure 3 assembled;
Figure 5 shows an end perspective view of the embodiment shown in Figure 3;
Figures 6A-C show steps in the fitting of the embodiment shown in Figure 1 to an elbow crutch;
Figures 7A-C show steps in the fitting of the embodiment shown in Figure 3 to an axilla crutch; and Figures 8A-C show steps in the fitting of the embodiment shown in Figure 3 to a walking stick.
BEST MODES FOR CARRYING OUT THE INVENTION
6 Our Ref: 236016PCT/53 Referring to Figures 1 and 2 a preferred form of the invention in the form of a shock absorber insert for a walking aid in the form of an aluminium crutch is generally indicated by arrow 1.
Figure 1 shows the component parts of the shock absorber insert 1 in relation to an upper 2 and lower 3 support member shaft of an aluminium crutch. The shock absorber insert 1 is configured to be mid-mounted in the crutch. The head 4 of a piston 5 is configured to be removably fitted into and retained in the upper 2 shaft via a flexible retaining nib-spring 6 which locates the nibs 6A in one of lower 7A or higher 7B spaced holes in the piston head 4 and one of spaced holes 8 in the upper 2 shaft. The two spaced holes 7A, B are different diameters to accommodate different sizes of nib-spring 6. The height of the shock absorber insert 1 can be altered relative to the upper shaft 2 by positioning the nib-spring in different spaced holes 8.
The piston 5 also includes a rod 9 consisting of upper rod portion 9A and lower rod portion 9B of smaller diameter. A damper 10 is located on the lower rod portion 9B
and held in place by abutting the upper rod portion 9A and an abutment surface of the cylinder sleeve 11 in the form of an end wall 11A after insertion of the lower rod portion 9B into the cylinder, sleeve 11. The end of the lower rod portion 9B
extending through an aperture 11B in the end wall 11A is attached to the cylinder sleeve 11 using a washer 12 and attachment means in the form of an R-clip 13, made of steel wire, which inserts through an aperture 9C in the end of the lower rod portion 9B (best seen in Figure 5). A person skilled in the art would appreciate that other methods of attachment of the lower rod portion 9B within the cylinder sleeve 11 could be used without departing from the scope of the present invention such as a circlip (not shown) made of thin sheet spring steel. The rod 5 is therefore configured to more axially within the piston cylinder 11. The damper 10 reduces the speed of movement of the rod 5 within the within the piston cylinder 11. The
Figure 1 shows the component parts of the shock absorber insert 1 in relation to an upper 2 and lower 3 support member shaft of an aluminium crutch. The shock absorber insert 1 is configured to be mid-mounted in the crutch. The head 4 of a piston 5 is configured to be removably fitted into and retained in the upper 2 shaft via a flexible retaining nib-spring 6 which locates the nibs 6A in one of lower 7A or higher 7B spaced holes in the piston head 4 and one of spaced holes 8 in the upper 2 shaft. The two spaced holes 7A, B are different diameters to accommodate different sizes of nib-spring 6. The height of the shock absorber insert 1 can be altered relative to the upper shaft 2 by positioning the nib-spring in different spaced holes 8.
The piston 5 also includes a rod 9 consisting of upper rod portion 9A and lower rod portion 9B of smaller diameter. A damper 10 is located on the lower rod portion 9B
and held in place by abutting the upper rod portion 9A and an abutment surface of the cylinder sleeve 11 in the form of an end wall 11A after insertion of the lower rod portion 9B into the cylinder, sleeve 11. The end of the lower rod portion 9B
extending through an aperture 11B in the end wall 11A is attached to the cylinder sleeve 11 using a washer 12 and attachment means in the form of an R-clip 13, made of steel wire, which inserts through an aperture 9C in the end of the lower rod portion 9B (best seen in Figure 5). A person skilled in the art would appreciate that other methods of attachment of the lower rod portion 9B within the cylinder sleeve 11 could be used without departing from the scope of the present invention such as a circlip (not shown) made of thin sheet spring steel. The rod 5 is therefore configured to more axially within the piston cylinder 11. The damper 10 reduces the speed of movement of the rod 5 within the within the piston cylinder 11. The
7 Our Ref: 236016PCT/53 cylinder sleeve 11 is located inside the lower shaft 3 of the crutch by frictional fit which abuts an enlarged head portion 11C of the cylinder sleeve 11.
Flattened surfaces 9D on the upper rod portion 9A locate the rod 9 inside corresponding location surfaces (not shown) inside the cylinder sleeve 11 in a particular orientation so that the nib spring 6 can be more easily located into the spaced holes 8 in the upper shaft 2 (after location of the nib spring 6 in the piston head 4) by preventing the piston head 4 turning relative to the upper shaft 2 during insertion. A crutch user may change the height of the crutch several times in one -outing depending on the fatigue level of their upper body and/or different changing terrain. Profiled surfaces 9E on the upper rod portion 9A decrease material costs over an equivalent solid upper rod portion 9A and decrease cooling time inside the injection moulding machine during manufacture of the piston 5 as a result of the injection moulding coolant having more surface area on the upper rod portion 9A to cool and thereby increase speed of production and decrease production costs.
Flattened surfaces (not shown) inside the piston head 4 provide reinforcement via improved resistance to loads, compression and tension. The flattened surfaces also help to align the nibs 6A of the nib spring 6 during assembly of the shock absorber insert 1.
Another preferred form of the invention is generally indicated by arrow 14 in Figures 3 and 4 which shows a shock absorber insert 14 configured to be mounted into the end of the lower shaft 3 of an aluminium crutch. A plug 15 is configured to be removably fitted into the end of the head 4 of the piston 5 to reinforce the head 4. The head 4 is removably fitted into a foot 16 configured to provide a contact surface of the assembled crutch with a ground surface. The foot 16 is made of a frictional and flexible material such as rubber.
Flattened surfaces 9D on the upper rod portion 9A locate the rod 9 inside corresponding location surfaces (not shown) inside the cylinder sleeve 11 in a particular orientation so that the nib spring 6 can be more easily located into the spaced holes 8 in the upper shaft 2 (after location of the nib spring 6 in the piston head 4) by preventing the piston head 4 turning relative to the upper shaft 2 during insertion. A crutch user may change the height of the crutch several times in one -outing depending on the fatigue level of their upper body and/or different changing terrain. Profiled surfaces 9E on the upper rod portion 9A decrease material costs over an equivalent solid upper rod portion 9A and decrease cooling time inside the injection moulding machine during manufacture of the piston 5 as a result of the injection moulding coolant having more surface area on the upper rod portion 9A to cool and thereby increase speed of production and decrease production costs.
Flattened surfaces (not shown) inside the piston head 4 provide reinforcement via improved resistance to loads, compression and tension. The flattened surfaces also help to align the nibs 6A of the nib spring 6 during assembly of the shock absorber insert 1.
Another preferred form of the invention is generally indicated by arrow 14 in Figures 3 and 4 which shows a shock absorber insert 14 configured to be mounted into the end of the lower shaft 3 of an aluminium crutch. A plug 15 is configured to be removably fitted into the end of the head 4 of the piston 5 to reinforce the head 4. The head 4 is removably fitted into a foot 16 configured to provide a contact surface of the assembled crutch with a ground surface. The foot 16 is made of a frictional and flexible material such as rubber.
8 Our Ref: 236016PCT/53 The other components of the end mounted shock absorber insert 14, in the form of the piston 5, damper 10, cylinder sleeve 11, washer 12 and R-clip 13 are identical to the mid mounted shock absorber insert 1 shown in Figures 1 and 2. The cylinder sleeve Ills frictionally fit into the lower end of the lower 3 shaft.
Optionally the cylinder sleeve 11 may be fixed into the lower 3 shaft by adhesive.
The piston 5 and cylinder sleeve 11 are manufactured from moulded crystalline (glass injected) self-lubricating thermoplastic (acetyl resin). However, other rigid and lightweight materials could be used such as other plastics, carbon fibre, metal, metal alloy or composite material. The lightweight of the shock absorber insert improves ease of use of the walking aid incorporating the shock absorber insert 1, 14.
The dimensions of the shock absorber insert 1, 14 can be configured during manufacture for different diameter shafts of different walking aids. The minimum number of parts of the shock absorber insert 1, 14 keeps manufacturing costs to a minimum.
A user assembling the mid mounted shock absorber insert 1 (as shown in Figures 1, 2 and 6) in an existing crutch, from components supplied in a kit set, would follow the following method:
= disengage the upper 2 and lower 3 shafts (as shown in Figure 6A);
= take out the nib spring 6 from the lower tubing nib spring hole 3A (as shown in Figures 1 and 2) in the lower 3 tubing shaft;
= locate the nib spring 6 in the holes 7A, B (depending on the size of the nibs 6A) of the head 4 of the piston 5;
= =
select the required damper 10 and locate on the lower rod portion 9B of the piston 5;
= locate the rod 9 in the cylinder sleeve 11 by inserting the lower rod portion
Optionally the cylinder sleeve 11 may be fixed into the lower 3 shaft by adhesive.
The piston 5 and cylinder sleeve 11 are manufactured from moulded crystalline (glass injected) self-lubricating thermoplastic (acetyl resin). However, other rigid and lightweight materials could be used such as other plastics, carbon fibre, metal, metal alloy or composite material. The lightweight of the shock absorber insert improves ease of use of the walking aid incorporating the shock absorber insert 1, 14.
The dimensions of the shock absorber insert 1, 14 can be configured during manufacture for different diameter shafts of different walking aids. The minimum number of parts of the shock absorber insert 1, 14 keeps manufacturing costs to a minimum.
A user assembling the mid mounted shock absorber insert 1 (as shown in Figures 1, 2 and 6) in an existing crutch, from components supplied in a kit set, would follow the following method:
= disengage the upper 2 and lower 3 shafts (as shown in Figure 6A);
= take out the nib spring 6 from the lower tubing nib spring hole 3A (as shown in Figures 1 and 2) in the lower 3 tubing shaft;
= locate the nib spring 6 in the holes 7A, B (depending on the size of the nibs 6A) of the head 4 of the piston 5;
= =
select the required damper 10 and locate on the lower rod portion 9B of the piston 5;
= locate the rod 9 in the cylinder sleeve 11 by inserting the lower rod portion
9 Our Ref: 236016PCT/53 9B through aperture 11B in the end of cylinder 11 and secure the end of the lower rod portion 9B relative to the end wall 11A of cylinder 11 with washer 12 and R-clip 13;
= insert the cylinder sleeve 11 in the lower 3 shaft by friction fit (as shown in Figure 6C); and = insert the piston head 4 in the upper 2 shaft and locate the nibs 6A of the nib spring 6 to the required height holes 8 of the upper 2 shaft (as shown in Figure 6C).
A user assembling the shock absorber insert 14 (as shown in Figures 3 to 5, 7 and 8) in the lower end of the lower shaft 3 of an elbow crutch would follow the following method:
= disengage the foot 16 from the lower end of the lower 3 shaft;
= select the required damper 10 and locate on the lower rod portion 9B of the piston 5;
= locate the rod 9 in the cylinder sleeve 11 by inserting the lower rod portion 9B through aperture 11B in the end of cylinder 11 and secure the end of the lower rod portion 9B relative to the end wall 11A of _cylinder 11 with washer 12 and R-clip 13;
= insert the cylinder sleeve 11 in the lower 3 shaft (as shown in Figures and 8B);
= insert the plug 15 into the head 4 of the piston 5; and = insert the foot 16 over the head 4 of the piston 5 by friction fit (as shown in Figures 7C and 8C).
Alternatively the shock absorber insert 14 could be fitted into the lower end of the shaft 17 of an axilla crutch 18 (as shown in Figures 7B and C) or the lower end of the shaft 19 of a walking stick 20 (as shown in Figures 8B and C).
Our Ref: 236016PCT/53 The two embodiments shown in Figures 1 and 2 and Figures 3 and 4 will lengthen the overall length of the crutch after installation. The mid mounted configuration shown in Figures 1 and 2 will extend the device slightly more than the bottom mount configuration shown in Figures 3 and 4. For taller persons this is an advantage as the crutch will be more useful in terms of increased length in the mid-mounted position. However, the crutch may be cut by the user (using a pipe cutter or saw) to alter the overall height of the crutch to fit the user or by using a crutch size that is shorter in overall length.
The method can be performed by the user quickly and safely. If no damping is needed by the user during use then the shock absorber insert 1, 14 can be removed from the walking aid (even during use for example where the nature of the ground surface changes) by a reversal of the above assembly procedures.
In this way, the user can self-adjust the damping rate of the assembled crutch by interchanging a different damper 10 (selected from weight guide of the instruction manual supplied with the kit) during assembly of the shock absorber insert 1, according to the users weight and/or comfort level. The need for professional specification by a doctor or physiotherapist is minimised. The damper 10 is manufactured from moulded crystalline (glass injected) self-lubricating thermoplastic (acetyl resin). However, other flexible and mouldable materials can be used. The different damper 10 shore hardness is indicated by different colours.
Thus the damping performance of the assembled crutch can be adjusted depending on the weight of the user. For example, a damper with higher shore hardness would be preferred by a relatively heavier user to provide more support with less flexibility. In addition to altering the density of material, the design of the damper 10 may be varied depending on the shore hardness required. For example, the damper 10 can be solid, ribbed, concertinaed, air injected, or comprise at least one air cavity.
Our Ref: 236016PCT/53 In addition, because attachment of the shock absorber insert 1, 14 to the body of the crutch as a self-contained unit does not affect the integrity of the support members of the crutch 2, 3 there is minimal danger of failure of the crutch during use. Further, as the shock absorber insert 1,14 is fitted internally into the shaft of the walking aid further encasing and protecting the device, then safety is further improved by minimising obstruction to the user during use.
During use of the shock absorber insert 1, the piston 5 will stroke upwards and downwards inside the cylinder sleeve 11 as pressure is exerted onto and off the foot 16 of the crutch causing the damper 10 to compress and release as repetitive contact with a ground surface is made during the swing-through crutch-walk gait ambulation or walking manipulated by one arm. The shock absorber insert 1 is envisaged to have application to the sports rehabilitation and healthcare industries.
Preferred embodiments of the present invention have a number of advantages over the prior art which can include:
= improved ease of use in retrofitting the present invention to existing walking aids and without the use of tools unless the height of the original crutch is extended to the point where a user may cut the lower tubing (3) to adjust the effects of the lengthening of the overall crutch;
= improved safety of retrofitting the present invention to existing walking aids without affecting the integrity of the body of the walking aid;
= relative low cost to manufacture and purchase with a minimum of parts;
= streamlined design being an insert rather than attaching externally to the walking aid potentially damaging the thin aluminium tubing or causing obstruction to the user during use;
Our Ref: 236016PCT/53 = self adjustable by the user through the interchanging of dampers with different shore hardness (not requiring specification by a doctor or physiotherapist); and = lightweight resulting in improved manoeuvrability.
Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope thereof as defined in the appended claims.
= insert the cylinder sleeve 11 in the lower 3 shaft by friction fit (as shown in Figure 6C); and = insert the piston head 4 in the upper 2 shaft and locate the nibs 6A of the nib spring 6 to the required height holes 8 of the upper 2 shaft (as shown in Figure 6C).
A user assembling the shock absorber insert 14 (as shown in Figures 3 to 5, 7 and 8) in the lower end of the lower shaft 3 of an elbow crutch would follow the following method:
= disengage the foot 16 from the lower end of the lower 3 shaft;
= select the required damper 10 and locate on the lower rod portion 9B of the piston 5;
= locate the rod 9 in the cylinder sleeve 11 by inserting the lower rod portion 9B through aperture 11B in the end of cylinder 11 and secure the end of the lower rod portion 9B relative to the end wall 11A of _cylinder 11 with washer 12 and R-clip 13;
= insert the cylinder sleeve 11 in the lower 3 shaft (as shown in Figures and 8B);
= insert the plug 15 into the head 4 of the piston 5; and = insert the foot 16 over the head 4 of the piston 5 by friction fit (as shown in Figures 7C and 8C).
Alternatively the shock absorber insert 14 could be fitted into the lower end of the shaft 17 of an axilla crutch 18 (as shown in Figures 7B and C) or the lower end of the shaft 19 of a walking stick 20 (as shown in Figures 8B and C).
Our Ref: 236016PCT/53 The two embodiments shown in Figures 1 and 2 and Figures 3 and 4 will lengthen the overall length of the crutch after installation. The mid mounted configuration shown in Figures 1 and 2 will extend the device slightly more than the bottom mount configuration shown in Figures 3 and 4. For taller persons this is an advantage as the crutch will be more useful in terms of increased length in the mid-mounted position. However, the crutch may be cut by the user (using a pipe cutter or saw) to alter the overall height of the crutch to fit the user or by using a crutch size that is shorter in overall length.
The method can be performed by the user quickly and safely. If no damping is needed by the user during use then the shock absorber insert 1, 14 can be removed from the walking aid (even during use for example where the nature of the ground surface changes) by a reversal of the above assembly procedures.
In this way, the user can self-adjust the damping rate of the assembled crutch by interchanging a different damper 10 (selected from weight guide of the instruction manual supplied with the kit) during assembly of the shock absorber insert 1, according to the users weight and/or comfort level. The need for professional specification by a doctor or physiotherapist is minimised. The damper 10 is manufactured from moulded crystalline (glass injected) self-lubricating thermoplastic (acetyl resin). However, other flexible and mouldable materials can be used. The different damper 10 shore hardness is indicated by different colours.
Thus the damping performance of the assembled crutch can be adjusted depending on the weight of the user. For example, a damper with higher shore hardness would be preferred by a relatively heavier user to provide more support with less flexibility. In addition to altering the density of material, the design of the damper 10 may be varied depending on the shore hardness required. For example, the damper 10 can be solid, ribbed, concertinaed, air injected, or comprise at least one air cavity.
Our Ref: 236016PCT/53 In addition, because attachment of the shock absorber insert 1, 14 to the body of the crutch as a self-contained unit does not affect the integrity of the support members of the crutch 2, 3 there is minimal danger of failure of the crutch during use. Further, as the shock absorber insert 1,14 is fitted internally into the shaft of the walking aid further encasing and protecting the device, then safety is further improved by minimising obstruction to the user during use.
During use of the shock absorber insert 1, the piston 5 will stroke upwards and downwards inside the cylinder sleeve 11 as pressure is exerted onto and off the foot 16 of the crutch causing the damper 10 to compress and release as repetitive contact with a ground surface is made during the swing-through crutch-walk gait ambulation or walking manipulated by one arm. The shock absorber insert 1 is envisaged to have application to the sports rehabilitation and healthcare industries.
Preferred embodiments of the present invention have a number of advantages over the prior art which can include:
= improved ease of use in retrofitting the present invention to existing walking aids and without the use of tools unless the height of the original crutch is extended to the point where a user may cut the lower tubing (3) to adjust the effects of the lengthening of the overall crutch;
= improved safety of retrofitting the present invention to existing walking aids without affecting the integrity of the body of the walking aid;
= relative low cost to manufacture and purchase with a minimum of parts;
= streamlined design being an insert rather than attaching externally to the walking aid potentially damaging the thin aluminium tubing or causing obstruction to the user during use;
Our Ref: 236016PCT/53 = self adjustable by the user through the interchanging of dampers with different shore hardness (not requiring specification by a doctor or physiotherapist); and = lightweight resulting in improved manoeuvrability.
Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope thereof as defined in the appended claims.
Claims (16)
1. A shock absorber insert for a walking aid comprising:
a piston cylinder configured to be removably fitted into an internal space of a first support member of the walking aid by friction fit, the piston cylinder comprising an abutment surface;
a piston rod configured to be removably fitted into an internal space of a second support member of the walking aid and move axially within the piston cylinder; and a damper configured to be located on the piston rod and abut the abutment surface to reduce the speed of movement of the piston rod within the piston cylinder, wherein a portion of the piston rod is located within the piston cylinder with a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
a piston cylinder configured to be removably fitted into an internal space of a first support member of the walking aid by friction fit, the piston cylinder comprising an abutment surface;
a piston rod configured to be removably fitted into an internal space of a second support member of the walking aid and move axially within the piston cylinder; and a damper configured to be located on the piston rod and abut the abutment surface to reduce the speed of movement of the piston rod within the piston cylinder, wherein a portion of the piston rod is located within the piston cylinder with a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
2. The shock absorber insert for a walking aid as claimed in claim 1, wherein the damper is interchangeable with a similar damper of different shore hardness.
3. The shock absorber insert for a walking aid as claimed in claim 1, wherein the piston cylinder and piston rod are configured to enable the damper to be interchangeable with a similar damper of different shore hardness.
4. The shock absorber insert for a walking aid as claimed in any one of claims 1 to 3, wherein the clip is an R-clip.
5. The shock absorber insert for a walking aid as claimed in any one of claims 1 to 4, wherein the damper is manufactured from a moulded compressible material.
6. The shock absorber insert for a walking aid as claimed in any one of claims 1 to 4, wherein the damper is manufactured from polyurethane.
7. The shock absorber insert for a walking aid as claimed in any one of claims 1 to 6 wherein a portion of the piston rod comprises locating surfaces on an exterior surface of the piston rod which are configured to abut corresponding locating surfaces on an inside surface of the piston cylinder to limit the relative movement of the piston rod and piston cylinder after insertion of the piston rod into the piston cylinder.
8. The shock absorber insert for a walking aid as claimed in any one of claims 1 to 7, wherein the piston cylinder is configured to be removably fitted into a lower end of the first support member which contacts a ground surface during use of the walking aid.
9. The shock absorber insert for a walking aid as claimed in claim 8, wherein the piston cylinder is configured to be friction fitted within the lower end of the first support member.
10. The shock absorber insert for a walking aid as claimed in claim 8 or 9, wherein the shock absorber insert also comprises a foot which is configured to contact the ground surface during use of the walking aid and to be removably fitted over an end of the piston rod extending from the piston cylinder.
11. The shock absorber insert for a walking aid as claimed in claim 10, wherein the shock absorber insert also comprises a reinforcing plug configured to be inserted into an end of the piston rod before fitment of the foot over the same end of the piston rod.
12. The shock absorber insert for a waking aid as claimed in claim 11, wherein the piston rod is configured to be reversibly fitted to the second support member via a nib-spring locating in at least one aperture of an end of the piston rod and at least one aperture of the second support member.
13. A kit which can be readily assembled into a shock absorber insert for a walking aid comprising:
a piston' cylinder configured to be removably fitted into an internal space of a first support member of the waking aid by friction fit, the piston cylinder comprising an abutment surface;
a piston rod configured to be removably fitted into an internal space of a second support member of the walking aid and move axially within the piston cylinder;
a damper configured to be located on the piston rod and abut the abutment surface and reduce the speed of movement of the piston rod within the piston cylinder; and an attachment means configured to locate the piston rod within the piston cylinder, wherein a portion of the piston rod is located within the piston cylinder with a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
a piston' cylinder configured to be removably fitted into an internal space of a first support member of the waking aid by friction fit, the piston cylinder comprising an abutment surface;
a piston rod configured to be removably fitted into an internal space of a second support member of the walking aid and move axially within the piston cylinder;
a damper configured to be located on the piston rod and abut the abutment surface and reduce the speed of movement of the piston rod within the piston cylinder; and an attachment means configured to locate the piston rod within the piston cylinder, wherein a portion of the piston rod is located within the piston cylinder with a clip configured to be inserted through an aperture in an end of the piston rod which projects through an end wall of the piston cylinder after insertion of the piston rod through the abutment surface of the piston cylinder.
14. The kit as claimed in claim 13 wherein the damper is interchangeable with a similar damper of different shore hardness.
15. The kit as claimed in claim 13 or 14 wherein the kit also comprises an attachment means configured to locate the piston rod within the piston cylinder.
16. The kit as claimed in any one of claims 13 to 15 wherein the clip is an R-clip.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ580176 | 2010-04-05 | ||
| NZ58017610 | 2010-04-05 | ||
| NZ58064710 | 2010-04-23 | ||
| NZ580647 | 2010-04-23 | ||
| PCT/NZ2011/000045 WO2011126381A1 (en) | 2010-04-05 | 2011-04-01 | Shock absorber insert for a walking aid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2795581A1 CA2795581A1 (en) | 2011-10-13 |
| CA2795581C true CA2795581C (en) | 2017-08-22 |
Family
ID=44763128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2795581A Active CA2795581C (en) | 2010-04-05 | 2011-04-01 | Shock absorber insert for a walking aid |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2555647A4 (en) |
| AU (1) | AU2011238993B2 (en) |
| CA (1) | CA2795581C (en) |
| WO (1) | WO2011126381A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103082592B (en) * | 2013-01-23 | 2014-11-05 | 浙江大学 | Damping crutch with function of emergency support |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2397499A (en) * | 1945-03-17 | 1946-04-02 | Henri C Mcgowan | Crutch tip construction |
| US2888022A (en) * | 1956-11-30 | 1959-05-26 | Walter F Fanning | Shock absorber for orthopedic crutches |
| US4244602A (en) * | 1976-06-01 | 1981-01-13 | Allsop Automatic, Inc. | Shock-absorbing ski pole grip and method of adjusting the same |
| WO1998042292A1 (en) * | 1997-03-24 | 1998-10-01 | Lifelynx Inc. | Shock absorbing ambulatory assist device |
| US6055998A (en) | 1997-09-15 | 2000-05-02 | Bader; Michael | Shock absorbing fixture |
| IT1315174B1 (en) * | 2000-01-21 | 2003-02-03 | Renato Zaltron | CUSHIONED STICK |
| GB2354939B (en) * | 2000-11-06 | 2001-09-05 | Thomas Francis Mcgrath | Walking aid |
| US20020063369A1 (en) * | 2000-11-30 | 2002-05-30 | Kou-Ming Huang | Rubber shock absorber |
| US20010027802A1 (en) * | 2001-02-24 | 2001-10-11 | Mcgrath Thomas Francis | Walking aid |
| DE10123515A1 (en) * | 2001-05-15 | 2003-04-03 | Max Mayer | Crutch, or similar walking aid, has a gas pressure body at the top of the lower section to set the maximum weight loading on the crutch specified for the individual patient |
| US20050129456A1 (en) | 2003-05-09 | 2005-06-16 | Peter Van Der Sluis | Crutch apparatus and method |
| DE20318642U1 (en) * | 2003-12-03 | 2004-02-26 | Smartline International Co., Ltd., Nan Tou | Telescopic walking stick, comprising spring supported shock absorbing units inserted between segments |
| CA2608960A1 (en) * | 2005-06-15 | 2006-12-28 | Master Lock Company Llc | Receiver pin |
| US7395829B2 (en) | 2006-06-06 | 2008-07-08 | Chapman Richard R | Shock absorber crutch and shock absorber kit |
| GB0717167D0 (en) * | 2007-09-04 | 2007-10-17 | Goodwin David M | Walking aids |
-
2011
- 2011-04-01 AU AU2011238993A patent/AU2011238993B2/en not_active Ceased
- 2011-04-01 WO PCT/NZ2011/000045 patent/WO2011126381A1/en active Application Filing
- 2011-04-01 CA CA2795581A patent/CA2795581C/en active Active
- 2011-04-01 EP EP11766208.0A patent/EP2555647A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP2555647A1 (en) | 2013-02-13 |
| WO2011126381A1 (en) | 2011-10-13 |
| CA2795581A1 (en) | 2011-10-13 |
| EP2555647A4 (en) | 2014-10-15 |
| AU2011238993A1 (en) | 2012-12-06 |
| AU2011238993B2 (en) | 2014-05-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20150304 |