US3315412A - Closure device for closing an entrance opening - Google Patents

Closure device for closing an entrance opening Download PDF

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Publication number
US3315412A
US3315412A US439382A US43938265A US3315412A US 3315412 A US3315412 A US 3315412A US 439382 A US439382 A US 439382A US 43938265 A US43938265 A US 43938265A US 3315412 A US3315412 A US 3315412A
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US
United States
Prior art keywords
closure plate
locking
levers
pivotal
door
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 - Lifetime
Application number
US439382A
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English (en)
Inventor
Hultgren Karl Sten Rudolf
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.)
Saab Bofors AB
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Bofors AB
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Filing date
Publication date
Application filed by Bofors AB filed Critical Bofors AB
Application granted granted Critical
Publication of US3315412A publication Critical patent/US3315412A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/22—Manhole covers, e.g. on tanks; Doors on armoured vehicles or structures
    • F41H5/223—Manhole covers specially adapted for armoured or fighting vehicles

Definitions

  • the present invention relates to a closure device, and particularly to a door for an entrance port or a manhole of a motorized artillery gun or similar device.
  • Doors for entrance ports or manholes of movable guns and similar devices in order to protect satisfactorily personnel present within the space closed off by the door, should have a considerable weight whereby the handling of such doors is often laborious.
  • the door which is often desirable, is to be arranged in a substantially horizontal wall, it is often necessary in devices as now known for hinging such doors to have a hoisting apparatus especially for the purpose of moving the door from its closed into its open position, and vice versa.
  • the present invention provides a device for hinging a door for a port, as for instance, a port for personnel entering or leaving, by means of which the opening and the closing of the door is facilitated in that the door, when being moved from the closed to the open position and vice versa, is subjected to compensatory forces which are produced by said device and substantially counteract the strong gravitational forces acting upon the door due to its weight.
  • the device of the invention is so arranged that the door, while being moved into its open or closed position, continuously occupies a position substantially parallel to the wall surrounding the port.
  • the door is, according to the invention, hinged to the wall by means of two parallel lever linkages, each comprising at least two pivotal levers.
  • the parallel lever linkages are arranged on each one side of the door and pivot in mutually parallel planes, one end of each one of the levers being secured to the wall and the other end to the door by means of pivotal joints, one at each end of each lever.
  • At least one of said pivotal joints by means of which the levers are attached to the door pivotal in bearings secured thereto, comprises a pivot secured to the lever and extending perpendicularly to the planes in which the levers pivot.
  • the pivot is further fastened to a torsion rod secured against rotation, the other end of the rod being fastened to the door, also secured against rotation.
  • the door is hinged in four levers forming two parallel lever linkages in which the door end of each pivotal lever is secured as described by means of a pivot shaft to a torsion rod, the other end of which is secured to the door.
  • At least one pivotal lever preferably, however, one pivotal lever of each parallel lever linkage, comprises abutment means located at a distance from the pivot thereof attached to the door, and the door comprises displaceable locking members to cooperate with said abutment means.
  • FIG. 1 shows a door according to the invention, illus- 3,3 15,4 12 Patented Apr. 25, 1 967 trated in closed position covering a port or manhole in a wall to which the door is hinged;
  • FIG. 2 shows the door in a stage of an opening movement from the position illustrated in FIG. 1;
  • FIG. 3 shows locking means for locking the door in a selected one of several positions
  • FIG. 4 illustrates the means for locking the door in different positions.
  • a wall 1 includes a manhole or port 2 to be closed by a door in the form of a heavy closure plate 3, which, in closing position, covers the port 2 as shown in FIG. 1.
  • the door is attached to the wall 1 by means of four pivotal levers 4, 4 and 5, 5, each being at one end attached to the wall 1 by a pivotal joint 6, 6' and 7, 7, respectively, and to the door by a pivotal joint 8, 8' and 9, 9', respectively.
  • the pivotal levers 4, 4' and 5, 5, respectively, of the lever linkage here referred to as parallel lever linkages need not necessarily to have the same length. If it be desired that the angle between the plane of the wall surrounding the port and the plane of the closed door changes during the swinging of the door, the levers of the pairs may have lengths different one from another, the motions of the door then being a combination of parallel and tilted displacements.
  • each torsion rod may constitute a mounting shaft for the pertaining lever, or it may be secured to a lever pivot journaled in bearing blocks 18, 18', 19, 19', respectively, so that the rod is loaded when the respective lever is pivoted.
  • Each torsion rod is, at its other end, secured to the door by means of splines 15 inserted in correspondingly splined bores 16 of the bearing blocks 18, 18, 19, 19.
  • the torsion rods are so arranged that they do not develop a torsional force in a position of balance of the pivotal levers in which the same are substantially normal to the wall 1, the momentum of the force of gravity tending to turn the levers about the pivotal joints 6, 6', 7, 7 will for all other positions of the door be substantially counteracted by the force originating from the torsional momentum of the then loaded torsion rods. Accordingly, the force required for swinging the door in either direction can be substantially compensated by properly dimensioned torsion rods.
  • the gravity force acting as a turning force at the joints attached to the wall 1 will vary during the movement of the door away from and toward the balance position according to the sine of the angle between the pivotal levers and the vertical, and the torsion force is substantially proportional to the same angle. Accordingly, a full compensation of the weight cannot be readily obtained for all positions of the door.
  • the dimensioning of the torsion rods the force necessary for moving the door to swing the door from either end position thereof can be made very small in relation to the weight of the door.
  • the length of the pivotal levers, in particular of the pivotal lever 5 and 5', must be so selected that the port 2 is fully accessible.
  • the invention relates also to means for locking the.
  • these means preferably are arranged so that the door can be locked in a number of different positions.
  • the pivotal levers of plates 22 and 22 including holes 20, 21 and 20, 21', respectively.
  • the plates are fastened to levers 5 and 5 respectively, at the ends thereof at the door 3.
  • the holes 20, 20' and 21, 21', respectively, coact with displaceable locking members movable in guides in the door.
  • the locking means are shown as bolts 23 and 23, respectively, which by means of connecting rods 24, 24', respectively, and a pivotal lock handle 25 can be moved into engagement with holes 2i) and 20 or 21, 21, respectively depending upon the position of the door.
  • a closure device for closing an entrance opening in a wall comprising a closure plate for closing said wall opening, a pair of parallel linkage means, each of said linkage means including at least two levers disposed on two opposite sides of said closure plate, a first mounting means for pivotally securing one end of both levers of each linkage means to said wall, a pivotal second mounting means securing the other end of both levers of said linkage means to the closure plate, the levers of both linkage means being pivotal in mutually parallel planes for lifting and lowering said closure plate in reference to the wall, a torsion member for each of said levers, each of said torsion members being secured at one end to the closure plate and at the other end to the respective second mounting means for distorting said other end in'reference to said respective lever, the resulting members generating torsional distortions of the torsion forces counteracting the 5 and 5 mount receiving means in the form the levers of said linkage means one end by pivoting the gravitational force acting upon the closure plate when
  • each of said torsion members comprises a torsion bar disposed normal to said parallel planes, one end of each bar being fastened to the closure plate secured against rotation in reference thereto, and the other end being secured to said pivotal second mounting means for angular turning of said other end in reference to said one end in response to a pivotal movement of the respective lever, thereby causing said distortions of the torsion members.
  • each of said torsion members is in a substantially torsion-free state when said closure plate is lifted into its substantially uppermost position in reference to the wall by pivoting in the direction for lifting the closure plate.
  • a closure device wherein a locking means is provided for each of said second mounting means, and wherein said actuating member is connected to the locking member of each locking means to move both said locking members into and out of locking engagement.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
  • Hinges (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Basic Packing Technique (AREA)
  • Closures For Containers (AREA)
US439382A 1964-03-20 1965-03-12 Closure device for closing an entrance opening Expired - Lifetime US3315412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE352664 1964-03-20

Publications (1)

Publication Number Publication Date
US3315412A true US3315412A (en) 1967-04-25

Family

ID=20262306

Family Applications (1)

Application Number Title Priority Date Filing Date
US439382A Expired - Lifetime US3315412A (en) 1964-03-20 1965-03-12 Closure device for closing an entrance opening

Country Status (11)

Country Link
US (1) US3315412A (e)
AT (1) AT275363B (e)
BE (1) BE660669A (e)
CH (1) CH442077A (e)
DE (1) DE1584038A1 (e)
DK (1) DK112845B (e)
ES (1) ES310381A1 (e)
FR (1) FR1428259A (e)
GB (1) GB1107322A (e)
NL (1) NL6502182A (e)
NO (1) NO117623B (e)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4818009A (en) * 1987-09-24 1989-04-04 Muscat Peter P Convertible top automobile with vertically movable tail gate
US4917446A (en) * 1988-03-29 1990-04-17 Ditta Mariani Enrico System for moving the door of a cabinet from an open to a closed position
EP0863378A3 (de) * 1997-03-05 1999-12-01 Wegmann & Co. GmbH Luke für ein gepanzertes Kampffahrzeug
US11299009B2 (en) * 2020-03-10 2022-04-12 Denso International America, Inc. Vehicle HVAC system with modular door design

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8417896D0 (en) * 1984-07-13 1984-08-15 Turner Bros Kingswood Ltd Manhole cover
DE102004059016B4 (de) * 2004-12-08 2007-03-08 Rheinmetall Landsysteme Gmbh Vorrichtung zum Öffnen und Schließen eines Lukendeckels, insbesondere für ein gepanzertes Fahrzeug
DE102008063769B4 (de) * 2008-12-22 2011-02-17 Krauss-Maffei Wegmann Gmbh & Co. Kg Schwenkluke, insbesondere für militärische Fahrzeuge
FR3034856B1 (fr) * 2015-04-13 2018-10-12 Nexter Systems Trappe pour vehicule blinde et vehicule comportant une telle trappe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US722539A (en) * 1901-09-11 1903-03-10 Burnham Williams & Co Ventilator for cabs of locomotives.
US2483968A (en) * 1945-05-11 1949-10-04 Thermo Electric Mfg Company Furnace door and closure operator therefor
US2831219A (en) * 1955-04-18 1958-04-22 Corless B Nelson Door and supporting structure therefor
US3143196A (en) * 1961-12-19 1964-08-04 Joseph A Gutowski Driver's hatch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US722539A (en) * 1901-09-11 1903-03-10 Burnham Williams & Co Ventilator for cabs of locomotives.
US2483968A (en) * 1945-05-11 1949-10-04 Thermo Electric Mfg Company Furnace door and closure operator therefor
US2831219A (en) * 1955-04-18 1958-04-22 Corless B Nelson Door and supporting structure therefor
US3143196A (en) * 1961-12-19 1964-08-04 Joseph A Gutowski Driver's hatch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4818009A (en) * 1987-09-24 1989-04-04 Muscat Peter P Convertible top automobile with vertically movable tail gate
US4917446A (en) * 1988-03-29 1990-04-17 Ditta Mariani Enrico System for moving the door of a cabinet from an open to a closed position
EP0863378A3 (de) * 1997-03-05 1999-12-01 Wegmann & Co. GmbH Luke für ein gepanzertes Kampffahrzeug
US11299009B2 (en) * 2020-03-10 2022-04-12 Denso International America, Inc. Vehicle HVAC system with modular door design

Also Published As

Publication number Publication date
DE1584038A1 (de) 1969-03-27
BE660669A (e) 1965-07-01
NO117623B (e) 1969-09-01
AT275363B (de) 1969-10-27
ES310381A1 (es) 1965-07-01
GB1107322A (en) 1968-03-27
NL6502182A (e) 1965-09-21
DK112845B (da) 1969-01-20
FR1428259A (fr) 1966-02-11
CH442077A (de) 1967-08-15

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