CA1271143A - Caster swivel locking device - Google Patents
Caster swivel locking deviceInfo
- Publication number
- CA1271143A CA1271143A CA000597469A CA597469A CA1271143A CA 1271143 A CA1271143 A CA 1271143A CA 000597469 A CA000597469 A CA 000597469A CA 597469 A CA597469 A CA 597469A CA 1271143 A CA1271143 A CA 1271143A
- Authority
- CA
- Canada
- Prior art keywords
- stem
- plate
- socket
- flange
- aperture
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general; Anti-clogging castors
- B60B33/02—Castors in general; Anti-clogging castors with disengageable swivel action, i.e. comprising a swivel locking mechanism
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Legs For Furniture In General (AREA)
Abstract
ABSTRACT
A swivel lock device for preventing swiveling of a locking caster, when the brake mechanism of the caster is deployed, and a caster incorporating such device. The device of the subject invention is adapted for use with casters which are inserted into standard tubular leg sockets having a non-circular flange which extend from the bottom of the tubular leg. The subject device comprises a stem and interlocking means for preventing rotation of the stem relative to the socket when the brake mechanism is deployed, comprising a plate secured to the stem of the caster in a non-rotatable fashion, having coupling means for coupling the plate to the outer edges of the socket flange so as to prevent the plate from rotating relative to the socket flange.
A swivel lock device for preventing swiveling of a locking caster, when the brake mechanism of the caster is deployed, and a caster incorporating such device. The device of the subject invention is adapted for use with casters which are inserted into standard tubular leg sockets having a non-circular flange which extend from the bottom of the tubular leg. The subject device comprises a stem and interlocking means for preventing rotation of the stem relative to the socket when the brake mechanism is deployed, comprising a plate secured to the stem of the caster in a non-rotatable fashion, having coupling means for coupling the plate to the outer edges of the socket flange so as to prevent the plate from rotating relative to the socket flange.
Description
7~14~
F'IELD OF THE INVEMTION
The invention rela-tes to a caster swivel lock device for preventing swiveling of a caster relative to the leg of the equipmen-t -to which it is attached, and to a locking caster which incorporates such device.
-BACKGROUND OF THE INVENTION
Casters for mobile equipment, especially hospitalbeds, normally consist of a wheel housing for receiving a wheel, a stem for insertion in-to a leg socket, and a swiveling mechanism which enables the wheel housing to swivel rela-tive -to -the leg of the hospi-tial bed or o-ther piece of mobile equipmen-t. Casters exist which contain a ~` brake mechanism enabling both the swivel and wheel movement :
` to be simultaneously locked or unlocked by a simple foot operation. However, it has been found that swivel movement can s-till occur under certain circumstances, despite the action of such brake mechanism, because in some cases, -the stem rotates relative -to the socket in the -tubular leg of the mobile equipment, causing swiveling of the entire ~caster. The inevltable result lS tha-t injuries occur when, for~example, pa-tients lean against hospital beds or attempt i, ~ : -: .
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to climb into ~'locked" hospital beds, assuming -tha-t the bed will remain stationary.
To overcome this problem, some manufacturers cross-drill the stem. However, this solution requires cus-tomers to inser-t a fastener through the hole in the stem, which is inconvenient. A second solution involves manufacturing a special key-way stem which is designed to mate with a matching socket having a key protruding into the centre thereof. The problem with this approach, however, is that the circular s-tems and sockets are common to the trade, with bed manufacturers providing the sockets, so customers are not amenable to purchasing a caster with a stem that requires a special socket. Also, a square stem could be used to prevent the unwanted rotation, but again, this would require a depar-ture from the standard socket having a circular aperture therein.
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~ 20 SUMMARY OF THE INVENTION
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The present invention provides a swivel lock device ~or use with locking casters which are installed on ~ ~the tubular legs of~mobile platforms. Such tubular legs : ~ 25 ~ typically have inserted therein a socket having a
F'IELD OF THE INVEMTION
The invention rela-tes to a caster swivel lock device for preventing swiveling of a caster relative to the leg of the equipmen-t -to which it is attached, and to a locking caster which incorporates such device.
-BACKGROUND OF THE INVENTION
Casters for mobile equipment, especially hospitalbeds, normally consist of a wheel housing for receiving a wheel, a stem for insertion in-to a leg socket, and a swiveling mechanism which enables the wheel housing to swivel rela-tive -to -the leg of the hospi-tial bed or o-ther piece of mobile equipmen-t. Casters exist which contain a ~` brake mechanism enabling both the swivel and wheel movement :
` to be simultaneously locked or unlocked by a simple foot operation. However, it has been found that swivel movement can s-till occur under certain circumstances, despite the action of such brake mechanism, because in some cases, -the stem rotates relative -to the socket in the -tubular leg of the mobile equipment, causing swiveling of the entire ~caster. The inevltable result lS tha-t injuries occur when, for~example, pa-tients lean against hospital beds or attempt i, ~ : -: .
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to climb into ~'locked" hospital beds, assuming -tha-t the bed will remain stationary.
To overcome this problem, some manufacturers cross-drill the stem. However, this solution requires cus-tomers to inser-t a fastener through the hole in the stem, which is inconvenient. A second solution involves manufacturing a special key-way stem which is designed to mate with a matching socket having a key protruding into the centre thereof. The problem with this approach, however, is that the circular s-tems and sockets are common to the trade, with bed manufacturers providing the sockets, so customers are not amenable to purchasing a caster with a stem that requires a special socket. Also, a square stem could be used to prevent the unwanted rotation, but again, this would require a depar-ture from the standard socket having a circular aperture therein.
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~ 20 SUMMARY OF THE INVENTION
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The present invention provides a swivel lock device ~or use with locking casters which are installed on ~ ~the tubular legs of~mobile platforms. Such tubular legs : ~ 25 ~ typically have inserted therein a socket having a
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-`: '' ' : ' ' . , non-circular flange extending from the bottom of the tubular leg, each socke-t being provided with an axial aperture of circular cross-section. Typical locking casters include a wheel housing for receiving a wheel rotatable about a horizontal axis, swiveling means coupled to -the top of the wheel housing for enabling the wheel housing to swivel about a vertical axis, and brake means for preventing the wheel from rotating and the wheel housing from swiveling. The subject swivel lock device comprises a stem rigidly coupled to the swiveling means so as to extend along the aforesaid ver-tical axis, -the stem having an upper portion shaped and dimensioned for insertion into the socket aperture, and interlocking means comprises a plate rigidly secured to the - stem having coupling means for coupling the pla-te to the ; outer edges of socket flange so as to prevent the plate from rotating rela-tive to the socket flange. The plate is preferably secured to the stem by means of an aperture therein configured for mating wi-th a portion of the stem of non-circular cross-sectlon.
` In a preEerred embodiment, the stem has one flat ; -on it, and the pl`ate has a D-shaped opening which mates with the flat on the stem and two pairs of diametrically opposed .~ ~ locking ears which curve upward to engage the edge of -the socket flange. The plate thus engages both the stem and the
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-`: '' ' : ' ' . , non-circular flange extending from the bottom of the tubular leg, each socke-t being provided with an axial aperture of circular cross-section. Typical locking casters include a wheel housing for receiving a wheel rotatable about a horizontal axis, swiveling means coupled to -the top of the wheel housing for enabling the wheel housing to swivel about a vertical axis, and brake means for preventing the wheel from rotating and the wheel housing from swiveling. The subject swivel lock device comprises a stem rigidly coupled to the swiveling means so as to extend along the aforesaid ver-tical axis, -the stem having an upper portion shaped and dimensioned for insertion into the socket aperture, and interlocking means comprises a plate rigidly secured to the - stem having coupling means for coupling the pla-te to the ; outer edges of socket flange so as to prevent the plate from rotating rela-tive to the socket flange. The plate is preferably secured to the stem by means of an aperture therein configured for mating wi-th a portion of the stem of non-circular cross-sectlon.
` In a preEerred embodiment, the stem has one flat ; -on it, and the pl`ate has a D-shaped opening which mates with the flat on the stem and two pairs of diametrically opposed .~ ~ locking ears which curve upward to engage the edge of -the socket flange. The plate thus engages both the stem and the
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~.2~ 3 socke-t, when the socket is inserted into a hollow tubular leg of a mobile platform, thereby preven-ting rotation of the stem relative to -the socket when the brake means is deployed. As a result, swiveling of the caster relative to 5 the leg of -the mobile platform is prevented, when the caster ~: is locked.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example only, with reference to the following drawings, in which like numerals refer to like parts, and in which;
:
Figure l is a side view of a caster embodying the swivel lock device of the present invention, shown ins-talled on a tubular leg;
~, :'., Figure 2 is a cross-sectional view of a caster (without wheel) incorporating the subject swivel lock " device; and .:~
Figure 3 is an exploded perspective view of the : subject invention.:
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7~14;3 DETAILED DESCRIPTION OF THE PREF_RRED E BOnIMENT
Referring firs-t to Figures 1. and 2, il.lustra-ting : -the caster oE -the present invention, caster 10 comprises a wheel housing 12 having an axle aperture 14 for receiving an axle 16 and wheel 18 rota-table about a horizontal axis, a s-tem 20 for insertion in-to a socket 22 of leg 24, swiveling means shown generally as 26, a brake mechanism shown - generally as 28, and interlocking plate 30. Swiveling means .~ 10 26 comprises upper raceway 32 and lower raceway 34, bo-th of which are rigidly secured to s-tem sleeve 36, two sets of ball bearings 38, 40, and raceway cover 42. Ball bearings 38, 40 ride against wheel housing flange 44, and stem 20 is orbit riveted to the base of s-tem sleeve 36. The result is 1.5 that stem 20 is capable of swiveling freely relative to wheel housing 12 about a vertical axis. Brake mechanism 28 comprises brake pedal 45 and brake arm 46 having protrusions 48 for bearing against the tire of wheel 18 and a -tang 50 ~ for engaging with peripheral slots 52 in the bottom surface : 20 of lower raceway 34. When brake mechanism 28 is activated ;` by depressing brake pedal 45, protrusions 48 prevent rotation of the wheel, while tang 50 simul-taneously prevents swiveling of wheel housing 12 relative to lower raceway 34.
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~ 25 The subject swivel lock device comprises stem 20 .:
and lnterlocking plate 30. The other componets of caster 10 are conventional.
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, ~L2~ 3 Referring now to Figures 2 and 3, stem 20 has an upper por-tion 2l dimensioned to fit in-to a standard socket and a lower portion 23 of smaller diameter dimensioned to fi-t into stem sleeve 36. Upper portion 21 of stem 20 is provided with a grip ring 54 for preventing stem 20 from falling out of socket 22 and a circumferen-tial flat 58 for ma-ting wi-th interlocking plate 30. Flat 58 preferably extends only par-t way up upper portion 21 of stem 20. The height of fla-t 58 is preferably approximately equal to the thickness of plate 30, so tha-t plate 30 will be snugly sandwiched between upper por-tion 21 of stem 20 and the top of stem sleeve 36 during assembly.
As best shown in Figure 3, interlocking plate 30 has a centrally located D-shaped aperture 60, and four upwardly curving peripheral portions in the form of equally ~ spaced locking ears 62. The D-shaped aperture 60 of ;~ interlocking plate 30 is configured and dimensioned to mate , ~j wi-th flat 58 of stem 20. Locking ears 62 are configured to :~ 20 engage the outside edges of square flange 64 of socket 22.
; Interlocking plate 30 is slipped onto stem 20 before the . .
stem 20 is passed through the stem sleeve 36 and riveted together with the bottom of stem sleeve 36 to lower raceway 34. It should be apparent that when stem 20 is inserted into socket 22, socket flange 64 is engaged by locking ears ~ 62 of interlocklng plate 30. Consequently, when an attempt '.' : :
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7~43 is made -to rotate stem 20, lock:ing ears 62 bind against the corners of socket flange 62, thus preven-ting plate 30 from rotating rela-tive to socket flange 64.
In operation, a cas-ter 10 is attached to a hospital bed or other mobile equipment having tubular legs 24 of square cross-section, by firs-t inserting a s-tandard square socket 22 into the bot-tom of a leg. The upper portion 21 of stem 20 is then inserted into the circular aperture of socket 22. Once installed, -the stem 20 is prevented from swiveling rela-tive to socket 22 when a torque is applied to the stem, since locking ears 62 of interlocking plate 30 bind against the corners of socket flange 64, preven-ting plate 30 from rota-ting relative to flange 64. Thus, when brake mechanism 28 is deployed, there is no opportunity for the swiveling of stem 20 relative to socket 22j as socket 22 and stem 20 are firmly interlocked by interlocking plate 30.
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The upper portion 21 of -the stem 20 is dimensioned to be lnserted into a socket~22 wlth a circular aperture of standard diameter. However, the diameter of the stem 20 could be varied so that it can be fltted to sockets having non-standard apertures.
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_ . . - : . . , -~: , , -: -: ~; . ~ -1~:713L~,3 Whi]e the preferred embodimen-t of -the invention includes a s-tem having a single flat, -the cross-sec-tion of stem 20 at the bo-t-tom of upper portion 21 could assume some other non-circular shape, provided -tha-t aperture 60 of plate 30 is shaped to mate -therewith. For example, stem 20 could be provided with two or more flats, e.g. a pair of diametrically opposed flats, in which case, interlocking plate 30 would have to be provided with an aperture configured to mate with such flats, having two straight sides. Also, the fla-t could extend the en-tire length of stem, or the plate could be secured to the stem by other means, such as spot welding or by matching -threads, although a single flat on stem 20 and a matching aperture in plate 30 are believed to be the simplest and least expensive means of securing plate 30 to stem 20.
;
Interlocking plate 30 is preferably stamped from a ~,! round washer. However, there are a number of alternative ways of making such plate. For example it could be die cast, or formed from a pair of criss-crossed welded-together . :
~ ~ metal s-trips, having up-turned edges configured to conform :~ :
~ to the sides of the socket. And, while it is preferable : ~.
that plate 30 be made from metal, it could be made of molded plastic.
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~2~43 It will -thus be apparen-t to those skilled in the ; art that while the subject invention as been described and illus-trated with respect to various preferred and alternative embodiments, various modifications of these embodiments may be made withou-t departing from the subject inven-tion, the scope of which is defined in -the appended claims.
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~.2~ 3 socke-t, when the socket is inserted into a hollow tubular leg of a mobile platform, thereby preven-ting rotation of the stem relative to -the socket when the brake means is deployed. As a result, swiveling of the caster relative to 5 the leg of -the mobile platform is prevented, when the caster ~: is locked.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example only, with reference to the following drawings, in which like numerals refer to like parts, and in which;
:
Figure l is a side view of a caster embodying the swivel lock device of the present invention, shown ins-talled on a tubular leg;
~, :'., Figure 2 is a cross-sectional view of a caster (without wheel) incorporating the subject swivel lock " device; and .:~
Figure 3 is an exploded perspective view of the : subject invention.:
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7~14;3 DETAILED DESCRIPTION OF THE PREF_RRED E BOnIMENT
Referring firs-t to Figures 1. and 2, il.lustra-ting : -the caster oE -the present invention, caster 10 comprises a wheel housing 12 having an axle aperture 14 for receiving an axle 16 and wheel 18 rota-table about a horizontal axis, a s-tem 20 for insertion in-to a socket 22 of leg 24, swiveling means shown generally as 26, a brake mechanism shown - generally as 28, and interlocking plate 30. Swiveling means .~ 10 26 comprises upper raceway 32 and lower raceway 34, bo-th of which are rigidly secured to s-tem sleeve 36, two sets of ball bearings 38, 40, and raceway cover 42. Ball bearings 38, 40 ride against wheel housing flange 44, and stem 20 is orbit riveted to the base of s-tem sleeve 36. The result is 1.5 that stem 20 is capable of swiveling freely relative to wheel housing 12 about a vertical axis. Brake mechanism 28 comprises brake pedal 45 and brake arm 46 having protrusions 48 for bearing against the tire of wheel 18 and a -tang 50 ~ for engaging with peripheral slots 52 in the bottom surface : 20 of lower raceway 34. When brake mechanism 28 is activated ;` by depressing brake pedal 45, protrusions 48 prevent rotation of the wheel, while tang 50 simul-taneously prevents swiveling of wheel housing 12 relative to lower raceway 34.
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~ 25 The subject swivel lock device comprises stem 20 .:
and lnterlocking plate 30. The other componets of caster 10 are conventional.
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, ~L2~ 3 Referring now to Figures 2 and 3, stem 20 has an upper por-tion 2l dimensioned to fit in-to a standard socket and a lower portion 23 of smaller diameter dimensioned to fi-t into stem sleeve 36. Upper portion 21 of stem 20 is provided with a grip ring 54 for preventing stem 20 from falling out of socket 22 and a circumferen-tial flat 58 for ma-ting wi-th interlocking plate 30. Flat 58 preferably extends only par-t way up upper portion 21 of stem 20. The height of fla-t 58 is preferably approximately equal to the thickness of plate 30, so tha-t plate 30 will be snugly sandwiched between upper por-tion 21 of stem 20 and the top of stem sleeve 36 during assembly.
As best shown in Figure 3, interlocking plate 30 has a centrally located D-shaped aperture 60, and four upwardly curving peripheral portions in the form of equally ~ spaced locking ears 62. The D-shaped aperture 60 of ;~ interlocking plate 30 is configured and dimensioned to mate , ~j wi-th flat 58 of stem 20. Locking ears 62 are configured to :~ 20 engage the outside edges of square flange 64 of socket 22.
; Interlocking plate 30 is slipped onto stem 20 before the . .
stem 20 is passed through the stem sleeve 36 and riveted together with the bottom of stem sleeve 36 to lower raceway 34. It should be apparent that when stem 20 is inserted into socket 22, socket flange 64 is engaged by locking ears ~ 62 of interlocklng plate 30. Consequently, when an attempt '.' : :
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7~43 is made -to rotate stem 20, lock:ing ears 62 bind against the corners of socket flange 62, thus preven-ting plate 30 from rotating rela-tive to socket flange 64.
In operation, a cas-ter 10 is attached to a hospital bed or other mobile equipment having tubular legs 24 of square cross-section, by firs-t inserting a s-tandard square socket 22 into the bot-tom of a leg. The upper portion 21 of stem 20 is then inserted into the circular aperture of socket 22. Once installed, -the stem 20 is prevented from swiveling rela-tive to socket 22 when a torque is applied to the stem, since locking ears 62 of interlocking plate 30 bind against the corners of socket flange 64, preven-ting plate 30 from rota-ting relative to flange 64. Thus, when brake mechanism 28 is deployed, there is no opportunity for the swiveling of stem 20 relative to socket 22j as socket 22 and stem 20 are firmly interlocked by interlocking plate 30.
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The upper portion 21 of -the stem 20 is dimensioned to be lnserted into a socket~22 wlth a circular aperture of standard diameter. However, the diameter of the stem 20 could be varied so that it can be fltted to sockets having non-standard apertures.
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_ . . - : . . , -~: , , -: -: ~; . ~ -1~:713L~,3 Whi]e the preferred embodimen-t of -the invention includes a s-tem having a single flat, -the cross-sec-tion of stem 20 at the bo-t-tom of upper portion 21 could assume some other non-circular shape, provided -tha-t aperture 60 of plate 30 is shaped to mate -therewith. For example, stem 20 could be provided with two or more flats, e.g. a pair of diametrically opposed flats, in which case, interlocking plate 30 would have to be provided with an aperture configured to mate with such flats, having two straight sides. Also, the fla-t could extend the en-tire length of stem, or the plate could be secured to the stem by other means, such as spot welding or by matching -threads, although a single flat on stem 20 and a matching aperture in plate 30 are believed to be the simplest and least expensive means of securing plate 30 to stem 20.
;
Interlocking plate 30 is preferably stamped from a ~,! round washer. However, there are a number of alternative ways of making such plate. For example it could be die cast, or formed from a pair of criss-crossed welded-together . :
~ ~ metal s-trips, having up-turned edges configured to conform :~ :
~ to the sides of the socket. And, while it is preferable : ~.
that plate 30 be made from metal, it could be made of molded plastic.
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~2~43 It will -thus be apparen-t to those skilled in the ; art that while the subject invention as been described and illus-trated with respect to various preferred and alternative embodiments, various modifications of these embodiments may be made withou-t departing from the subject inven-tion, the scope of which is defined in -the appended claims.
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Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A swivel lock device for use with a locking caster for a mobile platform having tubular legs each having inserted therein a socket having a non-circular flange extending from the bottom of a tubular leg, each socket being provided with an axial aperture of circular cross-section, such caster including a wheel housing for receiving a wheel rotatable about a horizontal axis, swiveling means coupled to top of the wheel housing for enabling the wheel housing to swivel about a vertical axis, and brake means for preventing the wheel from rotating and the wheel housing from swiveling, said swivel lock device comprising a stem rigidly coupled to the swiveling means so as to extend along said vertical axis, the stem having an upper portion shaped and dimensioned for insertion into the socket aperture, and interlocking means for preventing rotation of the stem relative to the socket when the brake means is deployed, the interlocking means including a plate rigidly secured to the stem having coupling means for coupling the plate to the outer edges of the socket flange so as to prevent the plate from rotating relative to the socket flange.
2. The device as claimed in claim 1, wherein the plate is rigidly secured to the stem by means of an aperture in the plate configured for mating with a portion of the stem of non-circular cross-section.
3. The device as defined in claim 1, wherein the stem has an upper portion dimensioned to fit into the socket aperture and a lower portion of smaller diameter dimensioned to mate with the swiveling means.
4. The device as defined in claim 3, wherein the upper portion of the stem is provided with a non-circular bottom section shaped to mate with an aperture in the plate in a non-rotatable fashion.
5. The device as defined in claim 3, wherein the upper portion of the stem is provided with a circumferential flat of pre-selected shape and height, and wherein the plate is provided with an aperture shaped to mate with the flat.
6. The device as defined in claim 5, wherein the height of the flat is approximately equal to the thickness of the plate.
7. The device as claimed in claim 1, 4 or 5, wherein said coupling means comprises at least one upwardly extending portion of the periphery of the plate shaped to engage the outer edge of the socket flange in such a fashion as to bind thereagainst and prevent rotation of the plate relative to the flange when a torque is applied to the stem.
8. The device as claimed in claim 1, 4 or 5, for use with a socket having a square flange, wherein the coupling means comprises two pairs of diametrically opposed locking ears extending upwardly from the periphery of the plate, each of which is shaped to bind against a corner of the square flange when a torque is applied to the stem.
9. The device as claimed in claim 2, wherein the plate aperture is D-shaped.
10. The device as claimed in claim 2, wherein the stem has diametrically opposed circumferential flats, and the plate aperture is shaped to mate therewith.
11. A caster for use with a mobile platform having tubular legs each having inserted therein a socket having a non-circular flange extending from the bottom of a tubular leg, each socket being provided with an axial aperture of circular cross-section, said caster comprising:
a) a wheel housing for receiving a wheel rotatable about a horizontal axis;
b) swiveling means coupled to the top of the wheel housing for enabling the wheel housing to swivel about a vertical axis;
c) brake means for preventing the wheel from rotating and the wheel housing from swiveling;
d) a stem rigidly coupled to the swiveling means extending along said vertical axis and having an upper portion shaped and dimensioned for insertion into the socket aperture; and e) interlocking means for preventing rotation of the stem relative to the socket when the brake means is deployed, the interlocking means including a plate rigidly secured to the stem having coupling means for coupling the plate to the outer edges of the socket flange so as to prevent the plate from rotating relative to the socket flange.
a) a wheel housing for receiving a wheel rotatable about a horizontal axis;
b) swiveling means coupled to the top of the wheel housing for enabling the wheel housing to swivel about a vertical axis;
c) brake means for preventing the wheel from rotating and the wheel housing from swiveling;
d) a stem rigidly coupled to the swiveling means extending along said vertical axis and having an upper portion shaped and dimensioned for insertion into the socket aperture; and e) interlocking means for preventing rotation of the stem relative to the socket when the brake means is deployed, the interlocking means including a plate rigidly secured to the stem having coupling means for coupling the plate to the outer edges of the socket flange so as to prevent the plate from rotating relative to the socket flange.
12. The caster as claimed in claim 11, wherein the stem has an upper portion dimensioned to fit into the socket aperture and lower portion of smaller diameter dimensioned to mate with the swiveling means, and wherein the upper portion of the stem is provided with a non-circular bottom section shaped to mate with an aperture in the plate in a non-rotatable fashion.
13. The caster as defined in claim 12, wherein the non-circular bottom section comprises a circumferential flat of pre-selected shape and height.
14. The caster as defined in claim 11, 12 or 13, wherein the coupling means comprises an upwardly extending portion of the periphery of the plate shaped to engage the outer edge of the socket flange in such a fashion as to bind thereagainst and prevent rotation of the plate relative to the flange when a torque is applied to the stem.
15. A caster as defined in claim 11, 12 or 13, for use in association with a socket having a square flange, wherein the coupling means comprises two pairs of diametrically opposed locking ears extending upwardly from the periphery of the plate, each of which is shaped to bind against a corner of the square flange when a torque is applied to the stem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000597469A CA1271143A (en) | 1989-04-21 | 1989-04-21 | Caster swivel locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000597469A CA1271143A (en) | 1989-04-21 | 1989-04-21 | Caster swivel locking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1271143A true CA1271143A (en) | 1990-07-03 |
Family
ID=4139942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000597469A Expired - Fee Related CA1271143A (en) | 1989-04-21 | 1989-04-21 | Caster swivel locking device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1271143A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7065828B2 (en) * | 2003-04-07 | 2006-06-27 | Sorensen Mark C | Caster assembly with drawn kingpin rivet |
| WO2008148169A1 (en) * | 2007-06-06 | 2008-12-11 | Fallshaw Holdings Pty Ltd | A swivel castor braking system |
-
1989
- 1989-04-21 CA CA000597469A patent/CA1271143A/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7065828B2 (en) * | 2003-04-07 | 2006-06-27 | Sorensen Mark C | Caster assembly with drawn kingpin rivet |
| WO2008148169A1 (en) * | 2007-06-06 | 2008-12-11 | Fallshaw Holdings Pty Ltd | A swivel castor braking system |
| US8205297B2 (en) | 2007-06-06 | 2012-06-26 | Fallshaw Holdings Pty Ltd | Swivel castor braking system |
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Legal Events
| Date | Code | Title | Description |
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| MKLA | Lapsed |