GB2226361A - Telescopic spring - Google Patents

Telescopic spring Download PDF

Info

Publication number
GB2226361A
GB2226361A GB8924005A GB8924005A GB2226361A GB 2226361 A GB2226361 A GB 2226361A GB 8924005 A GB8924005 A GB 8924005A GB 8924005 A GB8924005 A GB 8924005A GB 2226361 A GB2226361 A GB 2226361A
Authority
GB
United Kingdom
Prior art keywords
hatch
casing
spring assembly
telescopic spring
counterbalance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8924005A
Other versions
GB2226361B (en
GB8924005D0 (en
Inventor
Alistair Macvicar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leith Cardle & Co Ltd
Original Assignee
Leith Cardle & Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Leith Cardle & Co Ltd filed Critical Leith Cardle & Co Ltd
Publication of GB8924005D0 publication Critical patent/GB8924005D0/en
Publication of GB2226361A publication Critical patent/GB2226361A/en
Application granted granted Critical
Publication of GB2226361B publication Critical patent/GB2226361B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
    • E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/514—Application of doors, windows, wings or fittings thereof for vehicles for ships
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53—Application of doors, windows, wings or fittings thereof for vehicles characterised by the type of wing

Abstract

A telescopic spring counterbalance comprises a spring assembly 1 having tubular casing 2 provided with a pivoted end fixing 3 and an end cap 4. A guide rod 6 extends through the end cap 4 and has an end plate 7 retained by a locknut 8 at one end inside the casing 2 and a second clevis end fixing 9. A plurality of disc springs 10 are fitted in the casing 2 between the end plate 7 and the end cap 4. The spring assembly 1 is affixed to a hatch door 11 and to the hatch surround. The hatch door 11 is hinged around a hinge point 14. The spring assembly 1 is tensioned so as to create an opening moment for the hatch door 11 which effectively offsets a portion of the weight of the hatch door 11 and this makes it considerably easier to open. <IMAGE>

Description

Telescopic Spring This invention relates to a telescopic spring especially but not exclusively for use as a counterbalance on hatches and the like.
Hatch covers on ships are often of very heavy construction and this necessitates the provision of a counterbalance arrangement. Such arrangements may involve the provision of a counterbalance weight or a torsion spring arrangement.
Such arrangements can be complicated and unreliable.
According to the present invention there is provided a telescopic spring counterbalance for hatches and the like comprising a spring assembly having a tubular casing, a guide rod having a first end portion slidably mounted in the casing and a second end portion extending from the casing, and a plurality of disc springs arranged in the casing to bias the first end of the guide rod away from the end of the casing through which the guide rod extends, the spring assembly being affixed to a hatch at one end and at the other end to a hatch surround the arrangement being such that the spring assembly provides an opening moment about the axis of a hinge of the hatch.
Preferably, the spring assembly is pivotally attached at one end to a bracket on the hatch and at the other end to a bracket extending from the hatch surround.
Preferably also, the bracket on the hatch surround is arranged such that the tension in the disc springs decreases as the hatch is opened.
Preferably also, adjustment means are provided for altering the tension in the disc springs.
Most preferably, said adjustment means comprises a threaded cap on the end of the tubular casing.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawing which is a sectional side view of a telescopic spring counterbalance in accordance with the present invention.
Referring to the drawing a telescopic spring counterbalance comprises a spring assembly shown generally at 1. The spring assembly 1 comprises a tubular casing 2 provided with a first clevis end fixing 3 at one end and a threaded end cap 4 provided with a locking nut 5 at the other end. A guide rod 6 extends through the end cap 4 and has an end plate 7 retained by a locknut 8 at one end inside the casing 2 and a second clevis end fixing 9 at the other end. A plurality of disc springs 10 are fitted in the casing 2 between the end plate 7 and the end cap 4.
The spring assembly 1 is affixed to a hatch door 11 by the first clevis end fixing 3 which is attached to a bracket 12 on the hatch 11 and to the hatch surround by the second clevis fixing 9 which is attached to a bracket 13 on the hatch surround.
The hatch door 11 is hinged around a hinge point 14. The spring assembly 1 is tensioned such that the clevis fixings 3 and 9 are biased towards one another. As a result of the offset, shown at 15, between the hinge 14 and the clevis fixing 9, this creates an opening moment for the hatch door 11 which effectively offsets a portion of the weight of the hatch door 11 and this makes it considerably easier to open. As the hatch door 11 swings open the force exerted by the spring assembly 1 decreases as the distance between the brackets 12 and 13 becomes smaller. The threaded end cap 4 and associated locknut 5 allow the initial tension in the disc springs 10 to be altered to achieve the desired characteristics for the assembly.
The telescopic spring counterbalance has particular application for ships hatches but other alternative uses are also envisaged. Modifications and improvements may be made without departing from the scope of the invention.

Claims (6)

1. A telescopic spring counterbalance for hatches and the like comprising a spring assembly having a tubular casing, a guide rod having a first end portion slidably mounted in the casing and a second end portion extending from the casing, and a plurality of disc springs arranged in the casing to bias the first end of the guide rod away from the end of the casing through which the guide rod extends, the spring assembly being affixed to a hatch at one end and at the other end to a hatch surround the arrangement being such that the spring assembly provides an opening moment about the axis of a hinge of the hatch.
2. A telescopic spring counterbalance as claimed in Claim 1, wherein the spring assembly is pivotally attached at one end to a bracket on the hatch and at the other end to a bracket extending from the hatch surround.
3. A telescopic spring counterbalance as claimed in Claim 2, wherein the bracket on the hatch surround is arranged such that the tension in the disc springs decreases as the hatch is opened.
4. A telescopic spring counterbalance as claimed in Claim 1, 2 or 3, wherein adjustment means are provided for altering the tension in the disc springs.
5. A telescopic spring counterbalance as claimed in Claim 4, wherein said adjustment means comprises a threaded cap on the end of the tubular casing.
6. A telescopic spring counterbalance substantially as hereinbefore described, with reference to and as shown in the accompanying drawings.
GB8924005A 1988-12-23 1989-10-25 Telescopic spring counterbalance for hatches and like hinged covers. Expired - Fee Related GB2226361B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888830198A GB8830198D0 (en) 1988-12-23 1988-12-23 Telescopic spring

Publications (3)

Publication Number Publication Date
GB8924005D0 GB8924005D0 (en) 1989-12-13
GB2226361A true GB2226361A (en) 1990-06-27
GB2226361B GB2226361B (en) 1992-12-23

Family

ID=10649139

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888830198A Pending GB8830198D0 (en) 1988-12-23 1988-12-23 Telescopic spring
GB8924005A Expired - Fee Related GB2226361B (en) 1988-12-23 1989-10-25 Telescopic spring counterbalance for hatches and like hinged covers.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888830198A Pending GB8830198D0 (en) 1988-12-23 1988-12-23 Telescopic spring

Country Status (1)

Country Link
GB (2) GB8830198D0 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134805A (en) * 1990-12-04 1992-08-04 H. Krantz Gmbh & Co. Fabric treatment tenter device with counterbalanced roof
US6378249B1 (en) * 1999-12-10 2002-04-30 3L Filters Ltd. Lid lifting mechanism
CN102878290A (en) * 2011-07-15 2013-01-16 大震锅炉工业（昆山）有限公司 Flange manhole for self-balancing horizontal rotary cover
US20140230330A1 (en) * 2011-03-09 2014-08-21 Alexandre Piermee Device to assist the opening of a covering element pivotably mounted relative to an edge of a frame

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103967370A (en) * 2013-02-05 2014-08-06 上海太比雅电力设备有限公司 Device for adjusting curve characteristic of gravitational torque of cover plate of hanging hole of torsional spring structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB885921A (en) * 1957-03-14 1962-01-03 Gewerk Eisenhuette Westfalia Loading machines of the jigging type
GB906684A (en) * 1961-03-03 1962-09-26 Bergen Pipesupport Corp Sway brace for piping
GB1162943A (en) * 1967-12-09 1969-09-04 Innocenti Soc Generale Safety Device for Hanging Counterweights
GB1398869A (en) * 1971-08-26 1975-06-25 Inca Mfg Corp Energy absorbing device
GB2016584A (en) * 1978-03-18 1979-09-26 Daimler Benz Ag A hatch cover swingable in relation to a hatch opening

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137669A (en) * 1978-02-08 1979-02-06 Sybron Corporation Balancing mechanism for manhole covers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB885921A (en) * 1957-03-14 1962-01-03 Gewerk Eisenhuette Westfalia Loading machines of the jigging type
GB906684A (en) * 1961-03-03 1962-09-26 Bergen Pipesupport Corp Sway brace for piping
GB1162943A (en) * 1967-12-09 1969-09-04 Innocenti Soc Generale Safety Device for Hanging Counterweights
GB1398869A (en) * 1971-08-26 1975-06-25 Inca Mfg Corp Energy absorbing device
GB2016584A (en) * 1978-03-18 1979-09-26 Daimler Benz Ag A hatch cover swingable in relation to a hatch opening

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134805A (en) * 1990-12-04 1992-08-04 H. Krantz Gmbh & Co. Fabric treatment tenter device with counterbalanced roof
US6378249B1 (en) * 1999-12-10 2002-04-30 3L Filters Ltd. Lid lifting mechanism
US20140230330A1 (en) * 2011-03-09 2014-08-21 Alexandre Piermee Device to assist the opening of a covering element pivotably mounted relative to an edge of a frame
US9021743B2 (en) * 2011-03-09 2015-05-05 Ej Emea Device to assist the opening of a covering element pivotably mounted relative to an edge of a frame
CN102878290A (en) * 2011-07-15 2013-01-16 大震锅炉工业（昆山）有限公司 Flange manhole for self-balancing horizontal rotary cover
CN102878290B (en) * 2011-07-15 2015-10-28 大震锅炉工业（昆山）有限公司 Self-balancing level revolving cover flange manhole

Also Published As

Publication number Publication date
GB8830198D0 (en) 1989-02-22
GB2226361B (en) 1992-12-23
GB8924005D0 (en) 1989-12-13

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20041025