US3911525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Castor, particularly for hospital beds
Assignee: Acousa Saxon SA
•
Filing: 1974-08-26
•
Granted: 1975-10-14
•
Expires: 1994-08-26
Abstract
Abstract A centrally locatable castor, particularly for hospital beds, with a fixing pin for mounting at the foot of a bed and carrying a castor fork and a roller by means of a ball bearing, having a polyhedral adjusting bolt which is carried axially through and non-rotatably in the fixing pin and which can be moved axially by means of a central adjusting linkage against the influence of a counter-spring which urges the bolt towards it upper position, the adjusting bolt having at its bottom end an adjusting disc projecting into the castor fork and engaging at a predetermined position of the adjusting bolt with a direction control member which prevents displacement due to swivelling and engaging at the lowest position with a brake unit freely mounted in the fork for preventing both displacement by swivelling and also movement of the roller, wherein a brake unit is provided which encloses an adjusting disc below and at the side and also encloses a counterdisc located under and arranged for engagement with the adjusting disc, a retaining spring being arranged for holding the brake unit and being located in a position of constant contact with either the back of the castor fork or the adjusting disc.
Inventors
- 👤 Berthold Haussels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:00
CPC Classifications
B; B60; B60B; B60B33/00; B60B33/02; B60B33/021; B62; B62B; B62B2301/00; B62B2301/04; B62B2301/046; B62B2301/0463; B62B2301/04632
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
203 words
A centrally locatable castor, particularly for hospital beds, with a fixing pin for mounting at the foot of a bed and carrying a castor fork and a roller by means of a ball bearing, having a polyhedral adjusting bolt which is carried axially through and non-rotatably in the fixing pin and which can be moved axially by means of a central adjusting linkage against the influence of a counter-spring which urges the bolt towards its upper position, the adjusting bolt having at its bottom end an adjusting disc projecting into the castor fork and engaging at a predetermined position of the adjusting bolt with a direction control member which prevents displacement due to swivelling and engaging at the lowest position with a brake unit freely mounted in the fork for preventing both displacement by swivelling and also movement of the roller, wherein a brake unit is provided which encloses an adjusting disc below and at the side and also encloses a counterdisc located under and arranged for engagement with the adjusting disc, a retaining spring being arranged for holding the brake unit and being located in a position of constant contact with either the back of the castor fork or the adjusting disc.
Claim 2
Dependent Claim
203 words
A centrally locatable castor, particularly for hospital beds, with a fixing pin for mounting at the foot of a bed and carrying a castor fork and a roller by means of a ball bearing, having a polyhedral adjusting bolt which is carried axially through and non-rotatably in the fixing pin and which can be moved axially by means of a central adjusting linkage against the influence of a counter-spring which urges the bolt towards its upper position, the adjusting bolt having at its bottom end an adjusting disc projecting into the castor fork and engaging at a predetermined position of the adjusting bolt with a direction control member which prevents displacement due to swivelling and engaging at the lowest position with a brake unit freely mounted in the fork for preventing both displacement by swivelling and also movement of the roller, wherein a brake unit is provided which encloses an adjusting disc below and at the side and also encloses a counterdisc located under and arranged for engagement with the adjusting disc, a retaining spring being arranged for holding the brake unit and being located in a position of constant contact with either the back of the castor fork or the adjusting disc.
Claim 3
Dependent Claim
98 words
A castor in accordance with claim 1, wherein the ball bearing between the fixing pin and the back of the castor fork consists of a combined axial and radial bearing with an inner ring of L-shaped section in which an outer ring of rectangular section is enclosed, wherein the inner ring rests on a shoulder formed round the fixing pin and outer ring being fixed to the back of the castor fork by cap screws and wherein a brake unit provided with corresponding axial wells is secured over the heads of such cap screws within the castor fork.
Claim 4
Dependent Claim
62 words
A castor in accordance with claim 2 wherein the brake unit is constructed as a brake slide movably mounted in the castor fork with its axis parallel to the adjusting bolt and with the counter-disc located therein, an axially-movable spring bolt serving as a directional control member being mounted for engagement with one or more directional recesses provided in the adjusting disc.
Claim 5
Dependent Claim
25 words
A castor in accordance with claim 3, wherein a spring associated with the spring bolt is accommodated in a well formed in the brake slide.
Claim 6
Dependent Claim
31 words
A castor in accordance with claim 3 wherein the brake slide carries an interchangeable brake shoe at its lower end which cooperates with an adjusting screw mounted in the brake slide.
Claim 7
Dependent Claim
77 words
A castor in accordance with claim 3, wherein the brake slide is secured to one end of a retaining spring which passes through the brake slide, the counter disc, the adjusting disc and the polyhedral adjusting bolt and is fixed at its other end to a bushing located against the adjusting bolt the bushing being covered by a cap nut which at the same time effects power transmission from a central adjusting linkage to the adjusting bolt.
Claim 8
Dependent Claim
46 words
A castor in accordance with claim 3, wherein a retaining screw is provided at the bottom end of the polyhedral adjusting bolt and passes through the counter disc, the screw carrying a retaining spring supported between a flange on the retaining screw and the counter disc.
Claim 9
Dependent Claim
35 words
A castor in accordance with claim 7, wherein a spacer sleeve is mounted round the shank of the retaining screw and is located between the flange and the lower end of the polyhedral adjusting bolt.
Claim 10
Dependent Claim
39 words
A castor in accordance with claim 1, wherein the adjusting disc is provided with a toothed conical surface and the counter-disc has corresponding conical toothing and is non-rotatably housed in a recess provided in the face of brake unit.
Claim 11
Dependent Claim
54 words
A castor in accordance with claim 1 wherein the adjusting disc has a cut-out in its circumference arranged to engage in its uppermost position with a radial projection located on the back of the castor fork and serving as a direction control member, the disc in its middle position being disengaged from the projection.
Claim 12
Dependent Claim
60 words
A castor in accordance with claim 10, wherein the brake unit is freely mounted on a bolt located closely under the back of the castor fork, the upper side of the brake unit enclosing the cut-out and being urged against the back of the castor fork by a support spring located between it and the back of the castor fork.
Claim 13
Dependent Claim
40 words
A castor in accordance with claim 10, wherein the adjusting screw is mounted on the underside of the brake unit at the height of the cut-out and its head extending down from the brake unit forms the actual brake shoe.
Claim 14
Dependent Claim
48 words
A castor in accordance with claim 12, wherein the brake unit consists of synthetic material and the threaded shank of the adjusting screw is both carried in a metal nut pressed into the synthetic material and extends in a self-locking manner into the synthetic material beyond the nut.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |