CA1264265A - Telescopic crutch and walking stick - Google Patents
Telescopic crutch and walking stickInfo
- Publication number
- CA1264265A CA1264265A CA000506059A CA506059A CA1264265A CA 1264265 A CA1264265 A CA 1264265A CA 000506059 A CA000506059 A CA 000506059A CA 506059 A CA506059 A CA 506059A CA 1264265 A CA1264265 A CA 1264265A
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- CA
- Canada
- Prior art keywords
- tube
- tubes
- walking stick
- middle tube
- aligned holes
- 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.)
- Expired - Fee Related
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Abstract
ABSTRACT OF THE DISCLOSURE:
A telescopic combined crutch and walking stick, having a lower ground-engaging tube; a middle tube mounted slidably and non-rotatably in the ground engaging tube and lockingly therein for positioning it in the lower tube in one of several selectable positions and an upper tube mounted slidably and non-rotatably in middle tube and lockingly therein for positioning it in the middle tube in one of several selectable positions. The tubes are of a length such that, when they are fully retracted one into the other, the length of the combined crutch and stick is about 1/3 the length when fully extended.
The combination further includes an armpit support and a resilient detent which readily mounts and dismounts it on the upper end of the upper tube, and a walking stick handle is adjustably mounted at the upper end of said middle tube.
A telescopic combined crutch and walking stick, having a lower ground-engaging tube; a middle tube mounted slidably and non-rotatably in the ground engaging tube and lockingly therein for positioning it in the lower tube in one of several selectable positions and an upper tube mounted slidably and non-rotatably in middle tube and lockingly therein for positioning it in the middle tube in one of several selectable positions. The tubes are of a length such that, when they are fully retracted one into the other, the length of the combined crutch and stick is about 1/3 the length when fully extended.
The combination further includes an armpit support and a resilient detent which readily mounts and dismounts it on the upper end of the upper tube, and a walking stick handle is adjustably mounted at the upper end of said middle tube.
Description
The present invention relates to a telescopic combi-ned crutch and walking stick.
A main object of the invention is to provide a crutch and walking stick combination of the type mentioned above that can be rapidly and sufficiently collapsed to be insertable in a small piece of luggage, such as a brief case, while yet being extensible adjustably to suit the height of any average crutch user. Still, the length may be so adjustably reduced as to make the article useable as a walking stick.
It is still a further object of the invention to provide an article of the above type which is quite simple in construction so that it can be produced at a relatively low cost.
In accordance with the invention, the length in col-lapsed or retracted form of the combined crutch and walkingstick can be about only one third of its length in extended form. In a preferred form, the armpit support is removable so as to still further reduce the encumbrance when it is in-tended to carry the article about in a luggage of reduced size.
Also, easily and rapidly operable detent devices are preferably foreseen to adjust the length of the crutch or walking stick to suit a particular user. Preferably also, it is foreseen to easily remove the walking stick handle or slide it along the middle tube wherever such is found accommodating to suit a user of a particular height.
More specifically, the invention is broadly claimed herein as a telescopic combined crutch and walking stick, com-prising:
- a lower ground-engaging tube;
- a middle tube slidably mounted in said ground en-gaging tube;
- fi~st locking means in the middle tube for posi-tioning said middle tube in said lower tube in one of several selectable positions;
: ~.
1, , , - an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for posi-tioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the mid-dle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
and wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry there-with.
According to a preferred embodiment, this combinedcrutch and walking stick further comprises means for preventing relative rotation of said lower, middle and upper tubes and means for blocking all but one of said aligned holes of said lower tube and all but one of said aligned holes of said middle ~;a6s tube.
This particular provision makes it sure that the aligned holes of the middle tube be in alignment with the ali-gned holes of the lower tube and vice versa and thus that the combined crutch and walking stick functions appropriately without undue tube adjustment. According to a particularly preferred embodiment, this is obtained in the provision of flattened sections formed on the telescoping tubes, these flat-tened sections facing of course one another and thereby preven-ting relative rotation between the tubes.
Advantageously, the holes of the middle and lowertubes are evenly spaced from one another, the spacing between the holes of one of the tubes beiny greater than the spacing between the holes of the other tube with the smaller of the two spacings being greater than the length of the short sleeve to which the handle is secured.
A search was carried out prior to the filing of the present application which has revealed the following four U.S.
patents:
923,352 ~f 1909 1,254,993 of 1918
A main object of the invention is to provide a crutch and walking stick combination of the type mentioned above that can be rapidly and sufficiently collapsed to be insertable in a small piece of luggage, such as a brief case, while yet being extensible adjustably to suit the height of any average crutch user. Still, the length may be so adjustably reduced as to make the article useable as a walking stick.
It is still a further object of the invention to provide an article of the above type which is quite simple in construction so that it can be produced at a relatively low cost.
In accordance with the invention, the length in col-lapsed or retracted form of the combined crutch and walkingstick can be about only one third of its length in extended form. In a preferred form, the armpit support is removable so as to still further reduce the encumbrance when it is in-tended to carry the article about in a luggage of reduced size.
Also, easily and rapidly operable detent devices are preferably foreseen to adjust the length of the crutch or walking stick to suit a particular user. Preferably also, it is foreseen to easily remove the walking stick handle or slide it along the middle tube wherever such is found accommodating to suit a user of a particular height.
More specifically, the invention is broadly claimed herein as a telescopic combined crutch and walking stick, com-prising:
- a lower ground-engaging tube;
- a middle tube slidably mounted in said ground en-gaging tube;
- fi~st locking means in the middle tube for posi-tioning said middle tube in said lower tube in one of several selectable positions;
: ~.
1, , , - an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for posi-tioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the mid-dle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
and wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry there-with.
According to a preferred embodiment, this combinedcrutch and walking stick further comprises means for preventing relative rotation of said lower, middle and upper tubes and means for blocking all but one of said aligned holes of said lower tube and all but one of said aligned holes of said middle ~;a6s tube.
This particular provision makes it sure that the aligned holes of the middle tube be in alignment with the ali-gned holes of the lower tube and vice versa and thus that the combined crutch and walking stick functions appropriately without undue tube adjustment. According to a particularly preferred embodiment, this is obtained in the provision of flattened sections formed on the telescoping tubes, these flat-tened sections facing of course one another and thereby preven-ting relative rotation between the tubes.
Advantageously, the holes of the middle and lowertubes are evenly spaced from one another, the spacing between the holes of one of the tubes beiny greater than the spacing between the holes of the other tube with the smaller of the two spacings being greater than the length of the short sleeve to which the handle is secured.
A search was carried out prior to the filing of the present application which has revealed the following four U.S.
patents:
923,352 ~f 1909 1,254,993 of 1918
2,575,681 of 1951 2,590,607 of 1952 As is readily apparent, only the Grimball U.S. patent No. 2,590,607 is truly relevant to the present invention al-though failing completely to show the main 1~6q265 important features thereof. Thus there are, so to speak, only two tubes that are slidable one into the other, the ground engaging rod being so short as to hardly affect the length of the combined cane and crutch, in collapsed condition thereof. The shorter length that can be expected with such a combination, in retracted collapsed condition, is about half the length in fully extended position. Additionally, the armpit resting piece is not easily removable from the end of the upper staff and would in fact require a screw driver for its removal.
- 3a -~Z~5 It is therefore to be concluded that the armpit rest is not intended to be removed, in the combination of this patent. Additionally, the lower ground engaging rod is not quickly adjustable in predetermined len~th since, again, a screwdriver has to be used. Noticeable also is the walking stick or cane handle which is made solid with the middle section of the combination as compared to the slidable possibility of the handle in accordance with the combination herein disclosed and claimed.
Further ob jects and other advantages will be readily apparent from the description that follows of a preferred embodiment of the invention wherein:
Figure 1 is a side elevation view of a combined crutch and walking stick made according to the teaching of the invention, shown in fully extended condition;
Figure 2 is a view similar to that of Figure 1 but with the combined crutch and walking stick in fully collapsed or retracted condition;
Figure 3 is an elevation view, similar to that of Figure 1, but in partly collapsed condition and with several parts being shown in longitudinal cross-section;
Figure 4 is a longitudinal partial cross-section showing interengagement of two telescoping tubes;
Figure 5 is a transverse cross-section view of the combined crutch and walking stick taken slightly above the handle thereof;
Figure 6 is a longitudinal cross-sectional view of the upper part of the upper tube and the armpit rest attached thereto;
Figure 7 is a side elevation view of a portion of the lower tube intended to show its flattened section;
Figure 8 is a transverse cross-sectional view through telescoping central and lower tubes;
Figure 9 is a diagrammatic elevation view, partly broken away, of the tubes in telescoping arrange-i2~i~
ment;
Figure 10 is an elevation view, on a greatly enlarged scale, of a portion of the lower tube, and Figure 11 is a cross-sectional view, on an enlarged scale, through a portion of the lower tube and intended to illustrate a variant of the invention.
As shown, the telescopic collapsable combined crutch and walking stick or cane comprises a lower ground engaging tube l; a middle tube 3 telescopically slidable inside the lower tube 1 and an upper tube 5 slidably and telescopically received within the middle tube 3 and having, at its upper free end, an armpit support 7. A
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walking stick handle 9 is provided at the upper end of the middle tube 3 and, as will be further explained hereinafter, handle 9 can be moved along the upper end of the middle tube 3 to suit particular conditions.
Finally, the lower end of the lower tube 1 has a ground-engaging rubber pad or foot 11 which may be removably mounted on the end of the lower tube 1.
It will be noted, particularly from Figure 1, that the tubes 1, 3 and 5 are of a length such that when they are retracted one into the other, as shown in Figure 2, the overall length of the c~mbined crutch and stick is about 1/3 the length when fully extended. In other words, tubes 1, 3 and 5 have approximatively the same length.
The middle tube 3 as well as the lower tube 1 are each formed with a series of holes 13, 15, respectively, that extend through and are spa~ed along the wall of the tubes. With reference to Figure 4, showing the locking interengagement of tubes 1 and 3, there is provided a detent knob 17 inside the middle tube 3 and at its lower end, knob 17 extending through a further hole 14 of the middle tube 3 and having a shoulder 19 larger than the hole 14 whereby to prevent the knob 17 from escaping out of the middle tube 3. A spring 21 resiliently presses the knob 17 into the hole 14 and holds it there by engage-ment of the shoulder 19 with the inner wall of the middle tube 3. As will be noted, the knob 17 has a length which is sufficient for it to enter into one of the holes 15 of the lower tube 1 when one of those holes 15 registers with the hole 14. It will thus be appreciated that by pushing the knob 17 inward and out of engagement with the hole 15, it is possible to slide the middle tube 3 with respect to lower tube 1 until a further hole 15 is reached. In fact, to prevent the knob 17 from locking t~e two tubes 1 and 3 each time one of the holes 15 registers with the hole 14, the tip of the detent knob 17 is rounded and this allows, if tube 3 is moved sufficiently rapidly~ to jump over successive holes 15 until the desired length relation-ship between the tubes 1 and 3 is obtained at which time the tube 3 is moved until the next hole 15 is reached for locking the two tubes together by engagement of the knob 17 into the thus reached hole 15.
There is thus provided means to releasably lock the two tubes 1 and 3 together to arrive at the desired total length. The number of possibilities are of course as great as the number of holes 15 through the tube 1.
Similar locking means 17, 19 and 21 are provided at the lower end and inside the upper tube 5 which has, through its wall~ a hole similar to the further hole 14 of Figure 4, the detent knob then being engageable with anyone of the holes 13 through the middle tube 3. Consequently~
the total length of tubes 3 and 5 can be adjusted as desired, the number of possibilities being likewise equal to the number of holes 13.
As shown in Figure 4, the end of the spring 21 opposite that pressing on the knob 17 may advantageously be received in a well 23 of the inner wall of the middle tube 3. A similar well is also of course provided within the upper tube 5 for the relevant spring of the locking detent means.
Referring now to Figures 3 and 5, the walking stick handle 9 comprises a tube 25 which has an open end 27 formed with a pair of longitudinal slits 29 diametrically opposite one another, one only being shown in Figure 5. The means that serve to mount the handle 9 on the middle tube 3 comprise a short sleeve 31 which is slidable over the upper end of the middle tube 3 and which has a longitudinal slit 33, the short sleeve 31 and the handle tube 25, which radially extendstherefrom, are secured together by any known means such as by welding and ~26426S
with the longitudinal slits 29 of the handle tube 25 opening into the longitudinal slit 33 of the short sleeve. Releasable tightening means are provided on the handle tube 25, which includes a screw 35 as shown in Figure 5, allowing the ends of the slits 29 of the handle tube 25 to close in and, consequently, closing in of the short sleeve slit 33 so that the sleeve 31 may be clamped onto the middle tube 3O By releasing the pressure of screw 35, it is of course possible to loosen the short sleeve 31 to move the handle 9 to another selected location along the middle tube 3.
Preferably~ the holes of the middle and lower tubes 3, 1, are evenly spaced from one another and in order to afford a better selection as to the total length of the combination, the spacing between the holes of one of the tubes can be made wider than the spacing between the holes of the other tube. However, as will easily be gathered from Figure 1, it is preferable that the spacing between the holes 13 be greater than the width of the short sleeve 31 so as not to block any of the holes 13.
For convenience, the handle 9 may be provided with a cushioning sleeve 37 made of flexible material and force fitted over the tube 25 of the handle 9, the sleeve 37 having a cross-section which evenly increases in size from the short sleeve 31 to the free end of the tube 25 which is preferably hemispherical. The flexible material may for instance be rubber and t~e outwardly tapering shape of the sleeve 37 makes it particularly suitable for hanging the combined crutch and walking stick from a table when the handle 9 rests on the flat surface of the table.
As mentioned previously, the upper end of the upper tube 5 is provided with an armpit support 7 which as shown in Figure 3, is a T-shaped member 39 having a ~6~
transverse armpit rest 41 and a central tube 43 extending perpendicularly from the armpit rest 41 and fitting over the upper end of the upper tube 5, the latter having a through hole 45 cooperating with a resilient detent means which may be identical to that shown in Figure 4 and described above.
As shown in Figure 6, however, the detent knob may be formed with a central well 47 into which is lodged one end of the spring 49.
Alternatively, the central tube 43 of the armpit support 7 can be fixed to the upper end of the upper tube 5 by means of releasable tightening means similar to those used for clamping the handle to the middle tube 3 (see above), including a transversal screw passing through two eyelets integral to the central tube 43.
In both cases one can see that the armpit support 7 is detachably mounted and can be removed if desired, thereby leaving free the upper end of the tube 5 that can then be used as a hook when one is using the invention as a cane exclusively.
To ease in obtaining sliding displacement of the upper tube 5 into the middle tube 3 and the sliding of the middle tube 3 in the lower tube 1, there may be provided rings 49 and 51 at the lower ends and outwardly of the middle and upper tubes 3, 4, as well as inwardly of the upper ends of the lower and middle tubes 1, 3. This self-lubrica~ing material is preferably polymere acid can be NYLON (trade mark).
This of course assumes that the outer diameter of the middle tube 3 is~ smaller than the inner diameter of the lower tube and, likewise, the outside diameter of the upper tube 5 is smaller than the inner diameter of the middle tube 3.
Finally, cushioning sleeves 53 may be force fitted over each lateral part of the armpit rest 49, the sleeves 53 being of the same type and having the same purpose as ferrule 37 of the handle 9.
9~
In order that the lines of holes 13 and 15 be constantly one over the other, that is normal to the same plane containing the axes of tubes 1 and 3, for easy registration of the holes and insertion thereinto of the detent knobs 17 of tubes 3 and 5, the three telescoping tubes 1, 3 and 5 must not rotate one with respect to the others, as said previously. The rotation-preventing means of the preferred embodiment is best illustrated in Figure 8 showing the telescoping tubes 1 and 3 but in transverse cross-section rather than the longitudinal cross-section of Figure 3.
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/
/
/
- 8a -~%~5 It will be seen that the tubes 1 and 3 are provided with flattened sections 1' and 3' facing one another thereby preventing relative rotation. Upper tube 5 is likewise provided with a flattened section, not shown. Holes 13 and 15 extend centrally of and through the flattened sections or lands 1' and 3'.
In the variant of Figure 8, nylon or neoprene rivets 52, secured to the tube 1, act as spacers easing slidable displacement and are thus equivalent to the rings 49 and 51 of Figures 3 and 4. The rivets 52 can also be seen in Figure 9.
It has been said above, with respect to Figure 4, that the tip of the detent knob 17 is rounded so that if tube 3 is moved sufficiently rapidly, the knob 17 will jump over successive holes 15 until the desired length relationship between the tubes 1 and 3 be attained at which time the tube 3 is moved slowly until the knob 17 reaches the required hole 15 for the said desired length relationship, the same applying to tubes 3 and 5 when moved one with respect to the other.
A more positive manner of attaining this result is shown in Figures 7, 8 and 10. This manner resides in blocking all undesired holes 13 or 15 to prevent entry of the detent knob 17, leaving free for entry of the detent knobs 17, only the one hole 13 or 15 of each of tubes 3 and 1 that will give the proper preselected length relationship of tubes 1, 3 and 5.
The above hole blocking means is best illustrated in Figures 8 and 10 for telescoping tubes 1 and 3. It will be appreciated that a similar principle applies to tubes 3 and 5.
Referring to Figures 8 and 10, holes 15 are each formed with an arcuate groove 14 extending partially around hole 15 (see Figure 10). Received in groove 14 is a resilient open ring 16, or circlip, of which the free ends are inwardly turned to form gripping lugs 18. For insertion of a ring 16, the lugs 18 are gripped and brought toward one another to reduce its diameter, the ring is then properly positioned over the groove 14 and the lugs 18 are released, allowing the ring to expand out and lodge itself in the groove 14. As shown in Figure 10, the groove 14 does not extend the full periphery of hole 15 to prevent undue rotation of ring 16 when lodging in it, to reduce vibrations and to increase the bearing surface of the tube for the detent knob 17.
Another form of blocking means is shown in Figure 11. In this case, the holes 15 open inwardly into a slide groove 20 formed fully lengthwise of the flattened section or land 1' of tube 1 and delimited inwardly by facing shoulders 18 and 18'. Thus this straight groove 20 borders the holes 15 of tube 1. A flat strip 24, having essentially the same length as tube 1, is slid into the inward groove 20 and is stopped downwardly by the top surface of foot pad 11 (Fig. 3) in the case of tube 3 or by any other suitable means in the case of either tube of or tube 3. Such other suitable means may consist of a small internal projection 54 (Fig. 11~ obtained by pending or embossing the walls of the tubes 1 and/or 3 at appropriate locations. Similar projections may also be provided on top of each tube to prevent the inserted strip 24 from moving up when the crutch is extended. A lateral hole (not shown) may be provided in the tubes 1 and 3 rear the top of the strip to allow insertion of a pin for use in disengaging the strip from its groove 20 over the projection 54 in the case this strip has to be changed or readjusted.
Of course, it will be appreciated that this groove 20 and strip 24 construction has also to be present in tube
- 3a -~Z~5 It is therefore to be concluded that the armpit rest is not intended to be removed, in the combination of this patent. Additionally, the lower ground engaging rod is not quickly adjustable in predetermined len~th since, again, a screwdriver has to be used. Noticeable also is the walking stick or cane handle which is made solid with the middle section of the combination as compared to the slidable possibility of the handle in accordance with the combination herein disclosed and claimed.
Further ob jects and other advantages will be readily apparent from the description that follows of a preferred embodiment of the invention wherein:
Figure 1 is a side elevation view of a combined crutch and walking stick made according to the teaching of the invention, shown in fully extended condition;
Figure 2 is a view similar to that of Figure 1 but with the combined crutch and walking stick in fully collapsed or retracted condition;
Figure 3 is an elevation view, similar to that of Figure 1, but in partly collapsed condition and with several parts being shown in longitudinal cross-section;
Figure 4 is a longitudinal partial cross-section showing interengagement of two telescoping tubes;
Figure 5 is a transverse cross-section view of the combined crutch and walking stick taken slightly above the handle thereof;
Figure 6 is a longitudinal cross-sectional view of the upper part of the upper tube and the armpit rest attached thereto;
Figure 7 is a side elevation view of a portion of the lower tube intended to show its flattened section;
Figure 8 is a transverse cross-sectional view through telescoping central and lower tubes;
Figure 9 is a diagrammatic elevation view, partly broken away, of the tubes in telescoping arrange-i2~i~
ment;
Figure 10 is an elevation view, on a greatly enlarged scale, of a portion of the lower tube, and Figure 11 is a cross-sectional view, on an enlarged scale, through a portion of the lower tube and intended to illustrate a variant of the invention.
As shown, the telescopic collapsable combined crutch and walking stick or cane comprises a lower ground engaging tube l; a middle tube 3 telescopically slidable inside the lower tube 1 and an upper tube 5 slidably and telescopically received within the middle tube 3 and having, at its upper free end, an armpit support 7. A
- 4a -121~;4Z6~
walking stick handle 9 is provided at the upper end of the middle tube 3 and, as will be further explained hereinafter, handle 9 can be moved along the upper end of the middle tube 3 to suit particular conditions.
Finally, the lower end of the lower tube 1 has a ground-engaging rubber pad or foot 11 which may be removably mounted on the end of the lower tube 1.
It will be noted, particularly from Figure 1, that the tubes 1, 3 and 5 are of a length such that when they are retracted one into the other, as shown in Figure 2, the overall length of the c~mbined crutch and stick is about 1/3 the length when fully extended. In other words, tubes 1, 3 and 5 have approximatively the same length.
The middle tube 3 as well as the lower tube 1 are each formed with a series of holes 13, 15, respectively, that extend through and are spa~ed along the wall of the tubes. With reference to Figure 4, showing the locking interengagement of tubes 1 and 3, there is provided a detent knob 17 inside the middle tube 3 and at its lower end, knob 17 extending through a further hole 14 of the middle tube 3 and having a shoulder 19 larger than the hole 14 whereby to prevent the knob 17 from escaping out of the middle tube 3. A spring 21 resiliently presses the knob 17 into the hole 14 and holds it there by engage-ment of the shoulder 19 with the inner wall of the middle tube 3. As will be noted, the knob 17 has a length which is sufficient for it to enter into one of the holes 15 of the lower tube 1 when one of those holes 15 registers with the hole 14. It will thus be appreciated that by pushing the knob 17 inward and out of engagement with the hole 15, it is possible to slide the middle tube 3 with respect to lower tube 1 until a further hole 15 is reached. In fact, to prevent the knob 17 from locking t~e two tubes 1 and 3 each time one of the holes 15 registers with the hole 14, the tip of the detent knob 17 is rounded and this allows, if tube 3 is moved sufficiently rapidly~ to jump over successive holes 15 until the desired length relation-ship between the tubes 1 and 3 is obtained at which time the tube 3 is moved until the next hole 15 is reached for locking the two tubes together by engagement of the knob 17 into the thus reached hole 15.
There is thus provided means to releasably lock the two tubes 1 and 3 together to arrive at the desired total length. The number of possibilities are of course as great as the number of holes 15 through the tube 1.
Similar locking means 17, 19 and 21 are provided at the lower end and inside the upper tube 5 which has, through its wall~ a hole similar to the further hole 14 of Figure 4, the detent knob then being engageable with anyone of the holes 13 through the middle tube 3. Consequently~
the total length of tubes 3 and 5 can be adjusted as desired, the number of possibilities being likewise equal to the number of holes 13.
As shown in Figure 4, the end of the spring 21 opposite that pressing on the knob 17 may advantageously be received in a well 23 of the inner wall of the middle tube 3. A similar well is also of course provided within the upper tube 5 for the relevant spring of the locking detent means.
Referring now to Figures 3 and 5, the walking stick handle 9 comprises a tube 25 which has an open end 27 formed with a pair of longitudinal slits 29 diametrically opposite one another, one only being shown in Figure 5. The means that serve to mount the handle 9 on the middle tube 3 comprise a short sleeve 31 which is slidable over the upper end of the middle tube 3 and which has a longitudinal slit 33, the short sleeve 31 and the handle tube 25, which radially extendstherefrom, are secured together by any known means such as by welding and ~26426S
with the longitudinal slits 29 of the handle tube 25 opening into the longitudinal slit 33 of the short sleeve. Releasable tightening means are provided on the handle tube 25, which includes a screw 35 as shown in Figure 5, allowing the ends of the slits 29 of the handle tube 25 to close in and, consequently, closing in of the short sleeve slit 33 so that the sleeve 31 may be clamped onto the middle tube 3O By releasing the pressure of screw 35, it is of course possible to loosen the short sleeve 31 to move the handle 9 to another selected location along the middle tube 3.
Preferably~ the holes of the middle and lower tubes 3, 1, are evenly spaced from one another and in order to afford a better selection as to the total length of the combination, the spacing between the holes of one of the tubes can be made wider than the spacing between the holes of the other tube. However, as will easily be gathered from Figure 1, it is preferable that the spacing between the holes 13 be greater than the width of the short sleeve 31 so as not to block any of the holes 13.
For convenience, the handle 9 may be provided with a cushioning sleeve 37 made of flexible material and force fitted over the tube 25 of the handle 9, the sleeve 37 having a cross-section which evenly increases in size from the short sleeve 31 to the free end of the tube 25 which is preferably hemispherical. The flexible material may for instance be rubber and t~e outwardly tapering shape of the sleeve 37 makes it particularly suitable for hanging the combined crutch and walking stick from a table when the handle 9 rests on the flat surface of the table.
As mentioned previously, the upper end of the upper tube 5 is provided with an armpit support 7 which as shown in Figure 3, is a T-shaped member 39 having a ~6~
transverse armpit rest 41 and a central tube 43 extending perpendicularly from the armpit rest 41 and fitting over the upper end of the upper tube 5, the latter having a through hole 45 cooperating with a resilient detent means which may be identical to that shown in Figure 4 and described above.
As shown in Figure 6, however, the detent knob may be formed with a central well 47 into which is lodged one end of the spring 49.
Alternatively, the central tube 43 of the armpit support 7 can be fixed to the upper end of the upper tube 5 by means of releasable tightening means similar to those used for clamping the handle to the middle tube 3 (see above), including a transversal screw passing through two eyelets integral to the central tube 43.
In both cases one can see that the armpit support 7 is detachably mounted and can be removed if desired, thereby leaving free the upper end of the tube 5 that can then be used as a hook when one is using the invention as a cane exclusively.
To ease in obtaining sliding displacement of the upper tube 5 into the middle tube 3 and the sliding of the middle tube 3 in the lower tube 1, there may be provided rings 49 and 51 at the lower ends and outwardly of the middle and upper tubes 3, 4, as well as inwardly of the upper ends of the lower and middle tubes 1, 3. This self-lubrica~ing material is preferably polymere acid can be NYLON (trade mark).
This of course assumes that the outer diameter of the middle tube 3 is~ smaller than the inner diameter of the lower tube and, likewise, the outside diameter of the upper tube 5 is smaller than the inner diameter of the middle tube 3.
Finally, cushioning sleeves 53 may be force fitted over each lateral part of the armpit rest 49, the sleeves 53 being of the same type and having the same purpose as ferrule 37 of the handle 9.
9~
In order that the lines of holes 13 and 15 be constantly one over the other, that is normal to the same plane containing the axes of tubes 1 and 3, for easy registration of the holes and insertion thereinto of the detent knobs 17 of tubes 3 and 5, the three telescoping tubes 1, 3 and 5 must not rotate one with respect to the others, as said previously. The rotation-preventing means of the preferred embodiment is best illustrated in Figure 8 showing the telescoping tubes 1 and 3 but in transverse cross-section rather than the longitudinal cross-section of Figure 3.
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/
- 8a -~%~5 It will be seen that the tubes 1 and 3 are provided with flattened sections 1' and 3' facing one another thereby preventing relative rotation. Upper tube 5 is likewise provided with a flattened section, not shown. Holes 13 and 15 extend centrally of and through the flattened sections or lands 1' and 3'.
In the variant of Figure 8, nylon or neoprene rivets 52, secured to the tube 1, act as spacers easing slidable displacement and are thus equivalent to the rings 49 and 51 of Figures 3 and 4. The rivets 52 can also be seen in Figure 9.
It has been said above, with respect to Figure 4, that the tip of the detent knob 17 is rounded so that if tube 3 is moved sufficiently rapidly, the knob 17 will jump over successive holes 15 until the desired length relationship between the tubes 1 and 3 be attained at which time the tube 3 is moved slowly until the knob 17 reaches the required hole 15 for the said desired length relationship, the same applying to tubes 3 and 5 when moved one with respect to the other.
A more positive manner of attaining this result is shown in Figures 7, 8 and 10. This manner resides in blocking all undesired holes 13 or 15 to prevent entry of the detent knob 17, leaving free for entry of the detent knobs 17, only the one hole 13 or 15 of each of tubes 3 and 1 that will give the proper preselected length relationship of tubes 1, 3 and 5.
The above hole blocking means is best illustrated in Figures 8 and 10 for telescoping tubes 1 and 3. It will be appreciated that a similar principle applies to tubes 3 and 5.
Referring to Figures 8 and 10, holes 15 are each formed with an arcuate groove 14 extending partially around hole 15 (see Figure 10). Received in groove 14 is a resilient open ring 16, or circlip, of which the free ends are inwardly turned to form gripping lugs 18. For insertion of a ring 16, the lugs 18 are gripped and brought toward one another to reduce its diameter, the ring is then properly positioned over the groove 14 and the lugs 18 are released, allowing the ring to expand out and lodge itself in the groove 14. As shown in Figure 10, the groove 14 does not extend the full periphery of hole 15 to prevent undue rotation of ring 16 when lodging in it, to reduce vibrations and to increase the bearing surface of the tube for the detent knob 17.
Another form of blocking means is shown in Figure 11. In this case, the holes 15 open inwardly into a slide groove 20 formed fully lengthwise of the flattened section or land 1' of tube 1 and delimited inwardly by facing shoulders 18 and 18'. Thus this straight groove 20 borders the holes 15 of tube 1. A flat strip 24, having essentially the same length as tube 1, is slid into the inward groove 20 and is stopped downwardly by the top surface of foot pad 11 (Fig. 3) in the case of tube 3 or by any other suitable means in the case of either tube of or tube 3. Such other suitable means may consist of a small internal projection 54 (Fig. 11~ obtained by pending or embossing the walls of the tubes 1 and/or 3 at appropriate locations. Similar projections may also be provided on top of each tube to prevent the inserted strip 24 from moving up when the crutch is extended. A lateral hole (not shown) may be provided in the tubes 1 and 3 rear the top of the strip to allow insertion of a pin for use in disengaging the strip from its groove 20 over the projection 54 in the case this strip has to be changed or readjusted.
Of course, it will be appreciated that this groove 20 and strip 24 construction has also to be present in tube
3.
The strip 24, which may be made of plastic material, is provided with a single hole and with a series of transversal ~26~;~
tear lines (not shown) distributed and spaced along its length to make it possible to cut it to one given length where the hole of the strip will register with one preselected hole 15.
Once the strip 24 is adjusted in length and positioned in its groove 20, its hole will allow the detent knob 17 to enter only the preselected hole 15. Accordingly, the detent knob 17 will move only into that hole 15 which has thus been freed.
Again, the same construction applies as aforesaid to tube 3 with respect to the detent knob 17 of tube 5.
The strip 24, which may be made of plastic material, is provided with a single hole and with a series of transversal ~26~;~
tear lines (not shown) distributed and spaced along its length to make it possible to cut it to one given length where the hole of the strip will register with one preselected hole 15.
Once the strip 24 is adjusted in length and positioned in its groove 20, its hole will allow the detent knob 17 to enter only the preselected hole 15. Accordingly, the detent knob 17 will move only into that hole 15 which has thus been freed.
Again, the same construction applies as aforesaid to tube 3 with respect to the detent knob 17 of tube 5.
Claims (17)
1. A telescopic combined crutch and walking stick, comprising:
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube;
- first locking means in the middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for positioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper ' tube for positioning said upper tube in said middle tube com-prises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry there-with.
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube;
- first locking means in the middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for positioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper ' tube for positioning said upper tube in said middle tube com-prises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry there-with.
2. A combined crutch and walking stick as claimed in claim 1, further comprising means for preventing relative rotation of said lower, middle and upper tubes and means for blocking all but one of said aligned holes of said lower tube and all but one of said aligned holes of said middle tube.
3. A combined crutch and walking stick as claimed in claim 2, wherein said rotation preventing means consists of flattened sections provided in said lower, middle and upper tubes, said flattened sections facing one another, and wherein said aligned holes of said lower and middle tubes are respec-tively formed through the flattened sections of said lower and middle tubes.
4. A combined crutch and walking stick as claimed in claim 3, wherein said aligned holes of said lower and middle tubes are each formed with a groove along at least part of their walls, and said blocking means comprise resilient rings removably lodged into all of said grooves of said holes but one, for blocking entry of said detent knobs.
5. A combined crutch and walking stick as claimed in claim 3, wherein straight slide grooves are formed length-wise of and inwardly of said middle and lower tubes flattened sections, said slide grooves bordering the aligned holes of said middle and lower tubes, and wherein said blocking means comprises flat strips slid in said grooves, said strips having essentially the same length as said middle and lower tubes, respectively, and being each provided with a single hole posi-tioned so as to register with a preselected hole of the corres-ponding middle or lower tube thereby to allow the corresponding detent knob to move only into said preselected hole when the tubes are adjusted with respect to each other.
6. A combined crutch and walking stick as claimed in claim 1, 4, or 5, wherein said aligned holes of said middle and lower tubes are evenly spaced from one another.
7. A combined crutch and walking stick as claimed in claim 1, 4 or 5 wherein said aligned holes of said middle tube are evenly spaced from one another; said aligned holes of said lower tube are evenly spaced from one another; and said spacing between the aligned holes of one of said middle and lower tubes is greater than the spacing between the aligned holes of the other tube.
8. A combined crutch and walking stick as claimed in claim 1, 4 or 5, wherein said first and second detent knobs each have a rounded outer end surface projecting out of said lower and middle tubes when said knobs are in registry with the holes of said lower and middle tubes and of said middle and upper tubes, respectively.
9. A combined crutch and walking stick as claimed in claim 3, wherein said armpit support comprises a T-shaped member having a transverse armpit rest; a pair of free ends;
a central cavity extending perpendicularly into said armpit rest, said cavity being sized to fit over the upper end of the upper tube; and means for detachably fixing said armpit rest onto said upper end of said upper tube when said upper end is fitted in the cavity.
a central cavity extending perpendicularly into said armpit rest, said cavity being sized to fit over the upper end of the upper tube; and means for detachably fixing said armpit rest onto said upper end of said upper tube when said upper end is fitted in the cavity.
10. A combined crutch and walking stick as claimed in claim 9, including a pair of round-ended, cushioning sleeves made of flexible material force-fitted over said T-shaped mem-ber from the free ends thereof toward said central cavity, said sleeves each having a cross-section evenly increasing in size from said central cavity to the free ends of said T-shaped member.
11. A combined crutch and walking stick as claimed in claim 10, wherein said sleeve material is rubber.
12. A combined crutch and walking stick as claimed in claim 1, 4 or 5, wherein said walking stick handle comprises a tube having an open end formed with a pair of longitudinal slits diametrically opposite one another and said means moun-ting said handle on said middle tube comprise:
- a short sleeve slidable over the upper end of said middle tube and having a longitudinal slit;
- means securing said short sleeve and said handle tube radially from said sleeve with said longitudinal slits of said handle tube opening into said longitudinal slit of said short sleeve; and - releasable tightening means on said handle tube suitable to close in said slits of said handle tube and thereby said slit of said short sleeve around said middle tube to fix said handle on said middle tube at a selected location there-along.
- a short sleeve slidable over the upper end of said middle tube and having a longitudinal slit;
- means securing said short sleeve and said handle tube radially from said sleeve with said longitudinal slits of said handle tube opening into said longitudinal slit of said short sleeve; and - releasable tightening means on said handle tube suitable to close in said slits of said handle tube and thereby said slit of said short sleeve around said middle tube to fix said handle on said middle tube at a selected location there-along.
13. A combined crutch and walking stick as claimed in claim 1, 4 or 5, further comprising a round-ended cushioning sleeve made of flexible material force-fitted over said handle tube, said sleeve having a cross-section evenly increasing in size from said second sleeve to the free end of said handle tube.
14. A combined crutch and walking stick as claimed in claim 1, 4 or 5, further comprising a round-ended cushioning sleeve made of flexible material force-fitted over said handle tube, said sleeve having a cross-section evenly increasing in size from said second sleeve to the free end of said handle tube and being made of rubber.
15. A telescopic combined crutch and walking stick comprising:
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground en-gaging tube;
- first locking means in middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for positioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith; and wherein said aligned holes of said middle tube are evenly spaced from one another; said aligned holes of said lower tube are evenly spaced from one another; and said spacing between the aligned holes of one of said middle and lower tubes is greater than the spacing between the aligned holes of the other tube.
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground en-gaging tube;
- first locking means in middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for positioning said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith; and wherein said aligned holes of said middle tube are evenly spaced from one another; said aligned holes of said lower tube are evenly spaced from one another; and said spacing between the aligned holes of one of said middle and lower tubes is greater than the spacing between the aligned holes of the other tube.
16. A telescopic combined crutch and walking stick, comprising:
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube;
- first locking means in the middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for position-ing said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in regisry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith; and wherein said armpit support comprises a T-shaped member having a transverse armpit rest; a pair of free ends; a central cavity extending perpendicularly into said armpit rest, said cavity being sized to fit over the upper end of the upper tube; and means for detachably fixing said armpit rest onto said upper end of said upper tube when said upper end is fitted in the cavity, said combined crutch and walking stick further including a pair of round-ended, cushioning sleeves made of flexible material force-fitted over said T-shaped member from the free ends thereof toward said central cavity, said sleeves each having a cross-section evenly increasing in size from said central cavity to the free ends of said T-shaped -member.
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube;
- first locking means in the middle tube for positioning said middle tube in said lower tube in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for position-ing said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in regisry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith; and wherein said armpit support comprises a T-shaped member having a transverse armpit rest; a pair of free ends; a central cavity extending perpendicularly into said armpit rest, said cavity being sized to fit over the upper end of the upper tube; and means for detachably fixing said armpit rest onto said upper end of said upper tube when said upper end is fitted in the cavity, said combined crutch and walking stick further including a pair of round-ended, cushioning sleeves made of flexible material force-fitted over said T-shaped member from the free ends thereof toward said central cavity, said sleeves each having a cross-section evenly increasing in size from said central cavity to the free ends of said T-shaped -member.
17. A telescopic combined crutch and walking stick, comprising:
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube, - first locking means in middle tube for positioning said middle tube in said lower tube. in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for position-ing said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith;
said combined crutch and walking stick further comprising a round-ended cushioning sleeve made of flexible material force-fitted over said walking stick handle, said sleeve having a cross-section evenly increasing in size from said middle tube towards the free end of said handle.
- a lower ground-engaging tube:
- a middle tube slidably mounted in said ground engaging tube, - first locking means in middle tube for positioning said middle tube in said lower tube. in one of several selectable positions;
- an upper tube slidably mounted in said middle tube, said upper tube having a free upper end;
- second locking means in the upper tube for position-ing said upper tube in said middle tube in one of several selectable positions;
- an armpit support mounted at the upper end of said upper tube; and - a walking stick handle mounted at the upper end of said middle tube;
wherein said lower, middle and upper tubes are of a length such that, when said tubes are fully retracted one into the other, the length of said combined crutch and stick is about 1/3 the length thereof when fully extended;
wherein said middle tube and said lower tube are each formed with aligned holes through and spaced along the walls thereof;
wherein said first locking means mounted in the middle tube for positioning said middle tube in said lower tube comprises a first detent knob transversally extending inside of and at the lower end of said middle tube, and spring means for resiliently pressing said first knob into a hole of said aligned holes of said lower tube when in registry therewith;
wherein said second locking means mounted in the upper tube for positioning said upper tube in said middle tube comprises a second detent knob transversally extending inside of and at the lower end of said upper tube, and spring for means resiliently pressing said second knob into a hole of said aligned holes of said middle tube when in registry therewith;
said combined crutch and walking stick further comprising a round-ended cushioning sleeve made of flexible material force-fitted over said walking stick handle, said sleeve having a cross-section evenly increasing in size from said middle tube towards the free end of said handle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82870086A | 1986-02-12 | 1986-02-12 | |
| US828,700 | 1986-02-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1264265A true CA1264265A (en) | 1990-01-09 |
Family
ID=25252514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000506059A Expired - Fee Related CA1264265A (en) | 1986-02-12 | 1986-04-08 | Telescopic crutch and walking stick |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS62217964A (en) |
| CA (1) | CA1264265A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3363963B2 (en) * | 1993-08-13 | 2003-01-08 | 株式会社バンガード | Portable cane |
| US7434592B2 (en) * | 2003-10-10 | 2008-10-14 | Millennial Medical Equipment, L.L.C. | Ergonomic collapsible crutch |
| KR101955860B1 (en) * | 2018-10-14 | 2019-05-30 | 이광배 | Carbon stick of both handles for the old and the weak |
| KR102477364B1 (en) * | 2021-03-29 | 2022-12-15 | 주식회사 에스폴 | Pole |
-
1986
- 1986-04-08 CA CA000506059A patent/CA1264265A/en not_active Expired - Fee Related
-
1987
- 1987-02-12 JP JP62028379A patent/JPS62217964A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62217964A (en) | 1987-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |