Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
  • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
  • F16M11/20—Undercarriages with or without wheels
  • F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
  • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
  • F16M11/02—Heads
  • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
  • F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
  • F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
  • F16M11/105—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis the horizontal axis being the roll axis, e.g. for creating a landscape-portrait rotation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
  • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
  • F16M11/20—Undercarriages with or without wheels
  • F16M11/2007—Undercarriages with or without wheels comprising means allowing pivoting adjustment
  • F16M11/2021—Undercarriages with or without wheels comprising means allowing pivoting adjustment around a horizontal axis
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
  • G06F3/0202—Constructional details or processes of manufacture of the input device
  • G06F3/0208—Arrangements for adjusting the tilt angle of a keyboard, e.g. pivoting legs

Definitions

• the present invention relates to a support for an interface unit such as a display unit or a keyboard for a computer screen, said support comprising a basis and an arm which are mutually displaceable and where the mutual displacement takes place by a sliding movement of the arm with relation to the basis, where the basis is provided with means intended for placing at a base and where the arm has means for mounting the interface unit on the arm.
• the user to alter the tilting and the position of the interface unit in relation to the user, but which also ensures that the tilting and the position is ergonomically correct.
• a support where the arm comprises a sliding part with a surface being curved, and where the basis comprises a corresponding sliding part with a corresponding surface being curved and where the basis, alternatively the arm, furthermore comprises a hinge being provided between the interface unit and the means for placing the basis at a base.
• the mutual correlation between the sliding part and the hinged member ensures not only a satisfactory tilting of the interface in order to please the user but also an ergonomically correct tilting of the interface in order not to accidentally apply incorrect working conditions to the user.
• the sliding surfaces make sure that the interface is tilted in such a way that the centre of the interface is in substantially the one and same distance from the user.
• the hinged member ensures that the interface may be tilted in relation to the satisfaction of the user depending on the physical height of the user when standing and/or being seated and depending on any possible nuisance caused by light, reflections or other unpleasant influences from the surroundings of the interface.
• the invention has the great advantage that the user always will have the correct ergonomic viewing distance to the interface without having to change the bodily position of the user and irrespective of whether the interface is displaced to an upright position or to a substantially horizontal position, (t is possible for the user to individually adjust whether the interface should be in an upright position, a substantially horizontal position or any other position in between these two positions and also whether the interface should be tilted more or less in any of the positions.
• the interface may be mounted on the basis which again is supported by a base such as a tabletop, a wall, a ceiling or other further support means.
• a base such as a tabletop, a wall, a ceiling or other further support means.
• the interface may be mounted to a hinged member constituting part of the arm and the hinged member of the arm being mounted on a sliding surface constituting a part of the basis.
• the sliding surface is dimensioned so that the interface can be displaced from an upright substantially vertical position to a substantially horizontal position.
• the upright position is an advantage if the user is sitting at a table and viewing the interface such as a display unit of a computer or if the interface is mounted on a wall in a height corresponding to the height of the user.
• the horizontal position is an advantage if the user is standing at a table and is using the interface for drawing, reading or the like or if the interface constitutes as example a keyboard of a computer.
• Intermediate positions of the interface may be an advantage if the interface as example is a public information stand or if the support is intended for supporting both a display unit and a keyboard of the computer where the intermediate position may be a position where the display unit is being upright and the keyboard is being horizontal when mounted to the arm of the support.
• the arm or the basis is provided with a rotational member and the interface unit is mounted to the rotational member so that the interface unit may rotate around an axis which at least at one point is perpendicular to the curved sliding surface.
• a rotation of the interface may be an advantage for further enhancing the possibilities of adjusting the position of the interface. If the interface is a display unit for a computer, then it may be an advantage having the possibility to rotate the display unit 90°, one direction if the display unit is used to view a document in the portrait orientation, and another direction if the display unit is used to view a document in the landscape orientation.
• the arm is provided with a translational part and the interface unit is mounted to the translational part so that the interface unit may be displaced translational along an axis which at least at one point is parallel with the curved sliding surface.
• Providing a translational element onto which the interface is mounted further enhances the possibilities for the user to adjust the interface to the needs of the user. Sliding of the interface along the arm provides possibilities for the user to either slide the interface upwards and downwards when the interface is in an upright position or to slide the interface forwards and backwards when the interface is in a horizontal position.
• the interface may be spring biased in order to ease the sliding of the interface, especially when sliding the interface upwards when the interface is in an upright position. However, also sliding of the interface backwards and forwards when the interface is in horizontal position is eased if the interface is biased in both sliding directions of the sliding shoe.
• the spring biasing may be dimensioned so that the spring force is adjusted to maintain the interface in any selected position.
• locking means may be provided which either automatically or manually may be activated in order to lock the interface in a selected position.
• An example of a manually locking means is a bolt having and en surface that is intended for engaging with a wheel of the a biasing member, preferably an outer circumference of the wheel, and said bolt being releasable from a locking state where the end surface of the bolt is abutting the wheel and to a released state where the end surface is pulled away from the abutment with the wheel.
• An example of automatic locking means is a number of leaf springs provided with a pawl and where corresponding slots are provided in the sliding part and/or the translational part.
• the leaf springs is biasing the pawls into engagement with a slot when the pawl is situated in front of a slot and the leaf spring makes is possible for the pawl by overcoming the biasing force form the leaf spring to disengage form the slot when the pawl is moved away form the slot.
• fig. 1 is a side view of an interface being a display unit mounted to a support according to the invention and being positioned in an upright position
• fig. 2 is a side view of the interface being the display unit mounted to a support according to the invention and being positioned in a substantially horizontal position
• fig. 3 is a rear view of the interface being the display unit mounted to a support according to the invention and being positioned in a substantially upright position
• fig. 4 is an exploded view of a first embodiment of an arm together with a hinged member and a rotational member for the support according to the invention
• fig. 5 is an exploded view of a second embodiment of an arm together with a hinged member and a rotational member for the support according to the invention
• fig. 6 is an exploded view of a third and preferred embodiment of an arm together with a hinged member and a rotational member for the support according to the invention.
• Fig. 1 and fig. 2 show an interface 1 mounted on an arm 2 and a basis 3 of a support according to the invention.
• the basis 3 comprises a U-shaped brace 4 with one branch 5 of the U intended for being supported on a horizontal plane surface such as a table top and the other branch 6 of the U extending parallel to the one branch and being provided with a hinged member 7 at the end 6 of the other branch.
• the hinged member 7 is attached to the basis 4 by means of a hinge connection 8.
• the hinged member 7 comprises a sliding surface 9.
• the arm 2 comprises a sliding part 10 and a translational part 11.
• the sliding part 10 is attached to the sliding surface 9 of the hinged member 7.
• the translational part 11 extends vertical between an upper end 12 and a lower end 13 of the arm 2.
• the interface 1 is mounted to the arm 2 by means of a rotational member 14 attached to the translational part 11 of arm 2.
• the hinged member 7 will just be called the hinge 7.
• the support has different possibilities of adjusting the interface in relation to the base of the basis.
• the sliding part of the arm can be displaced along the sliding surface of the hinge.
• the hinge can rotate round an axis through the hinge, perpendicular to the plane of the figure.
• the rotational member can be displaced along the translational part of the arm in a direction parallel with the plane of the figure.
• the interface can be rotated in relation to the translational part around an axis parallel with the plane of the paper.
• the sliding part 10 is displaced so that the lower part 13 of the arm 2 is situated by the hinge, the hinge 7 being tilted to an upright position, and the rotational member 14 being situated approximately in the middle of the translational part 11.
• the interface 1 is in an upright position with a surface of the interface being vertical.
• the sliding part 10 is displaced so that the upper part 12 of the arm 2 is situated by the hinge 7, the hinge 7 being tilted to a tilt back position, and the rotational member 14 being situated partly down the translational part 11.
• the interface 1 is in a substantially horizontal position with a surface of the interface being almost horizontal.
• the interface may be positioned in any position intermediate of the two positions shown. Also, the interface may be even further displaced, and the displacement may take place by displacing all four mutual possibilities of displacement, the displacements taking place individually and independently of each other in response to the demands and the needs of the user. Besides the many different possibilities for the user to adjust and position the interface to the demands and the needs of the user, there is always a mutual relationship between the different displaceable parts and members which ensures that a non-ergonomical position is prevented.
• the positioning of the interface as shown in fig. 1 is advantageous if the interface as example is a display unit and the user is a person sitting by a table on the top of which the basis is placed and the user is only viewing the display unit such as a common computer screen.
• the positioning of the interface as shown in fig. 2 is advantageous if the interface is for example a display unit and the user is a person standing by a table on the top of which the basis is placed and the user is both viewing and handling the display unit such as an interactive display unit for drawing or for use as a finger touch screen.
• the positioning of the interface as shown in fig. 2 is advantageous if the interface is for example a keyboard and the user is a person sitting or standing by a table on the top of which the basis is placed.
• the examples mentioned are not limiting the possible types of interfaces and the possible applications of the types of interfaces.
• Fig. 3 shows the support from behind in the upright position of the interface.
• the figure shows the basis 3 and the arm 2 and the hinge 7 between the basis and the arm.
• the figure also shows a groove 15 established in the arm 2 and intended for co-operating with a bolt 16 extending through the hinge 7 and through the groove 15, said bolt 16 securing the arm 2 to the hinge 7 and serving as guide for the sliding displacement of the arm in relation to the hinge.
• the basis comprises a foot 17 extending sideways in relation to the rear and front of the basis and stabilising the basis and the entire support in a sideways direction.
• a part of the rotational member 14 is shown comprising a circular base plate 18 that the interface is mounted to. As shown with arrows, the interface may be rotated 90° around an axis 5 perpendicular to the plane of the paper.
• Fig. 4 is an exploded view of a first embodiment of an arm 2 according to the invention, said arm being part of a support according to the invention.
• the arm comprises the sliding part 10 and the translational part 11.
• the sliding part is attached to the hinge 7 by means
• the bolt 16 secures the arm 2 to the hinge 7 and guides the sliding displacement between the arm and the hinge. Furthermore the hinge 7 is provided with rails 19 extending upwards and downwards and being intended for running in the groove 15 as a supplementary guide of the sliding part and the arm in relation to the hinge.
• the rotational member 14 constitutes a displaceable means and comprises a circular base plate 18 onto which the interface (not shown) is to be secured by means of a number of fastening means such as six bolts 20 as shown.
• the rotational member furthermore comprises a circular guide plate 21.
• the guide plate 21 is provided with rails
• the 20 22 extending from a rear surface 23 of the guide plate.
• the 22 rails are intended for guiding the guide plate in relation to a groove 24 in the translational part 11.
• the guide plate 21 is provided with an oblong hole 25 in the middle of the plate. This hole 25 is intended for taking up a central plug 28 (see later description).
• the base plate 18 is provided with semicircular tracks 26 extending circumferentially along a quarter of a circle, i.e. 90°, and the guide plate 21 is provided with pawls 27 extending sideways and forwards and being intended for co-operating with the tracks 26 in the base plate 18. Rotating of the interface, which is secured to the base plate, will result in the tracks of the base plate being rotated in relation to the pawls of the guide
• the translational part 11 and the sliding part 10 are both provided with biasing means for biasing the rotational member towards an upper position in relation to the translational part and for biasing the sliding part towards an upper position in relation to the hinge.
• the biasing means are not only capable of biasing the rotational 5 member and the hinge, but are also capable of locking these elements infinitely in relation to the translational element and the sliding element, respectively.
• the biasing means for the rotational member and for the hinge are basically similar.
• the biasing means consist of a spiral spring 30, one end 31 of which, preferably the inner 10 end, is fastened to a rear cover 29 and another end 32 of which, preferably the outer end, is fastened to a wheel 33.
• the spiral spring 30 and the wheel 33 are enclosed in the rear cover 29.
• the rear cover 29 of the sliding part 10 and thus also the wheel 33 and the spiral spring 30 contained in the rear cover 29 are secured to the hinge 7 by the bolt 16 extending through the hinge 7 and engaging with a nut (not shown) in a central plug 34 of 15 the rear cover 29, said plug 34 extending through a hole 35 in the wheel 33.
• the rear cover 29 of the translational part 11 and thus also the wheel 33 and the spiral spring 30 contained in the rear cover are secured to the interface (not shown) by a specially designed bolt 29 being provided with an external thread and extending through a hole 36 in the rear cover 29, through the hole 35 in the wheel 33, through the groove 24 in the 20 translational part 11 and through the guide plate 21 and the base plate 18 of the rotational member 14 to a back of the interface and engaging with a corresponding internal thread in the back of the interface.
• the way of fastening the one end and the other end of the spiral spring to the rear cover 25 and to the wheel, respectively, is not shown, but may be effected in any suitable manner.
• One way is by providing slits in a central part of the rear cover and in an inner circumference of the wheel for fastening the ends of the spiral spring to these elements.
• a wire 37 is also partly enclosed in the rear cover 29 and extends from one end 38 being attached to an upper part of the translational part 11 or a lower part of the sliding part 10, 30 respectively, and another end 39 being attached to the wheel 33.
• the way of fastening the one end and the other end of the wire to the translational part 11 or to the sliding part 10, respectively, and to the wheel 33 is not shown, but may be effected in any suitable manner.
• a ring 41 is provided along an inner circumference of the rear cover 29.
• the ring is provided with a slit 42 to allow the wire 37 to pass from the wheel 33, which is enclosed in the rear cover 29, out of the rear cover to the upper end of the translational part 11 or the lower end of sliding part 10, respectively.
• the ring 41 is also provided with small protrusions 43 functioning as guides for the ring in relation to the grooves 24,25 in the translational part 11 and the sliding part 10, respectively.
• the ring 41 is provided with a locking mechanism. The locking mechanism is for fastening the wheel 33 in a selected rotational position and thereby maintaining the rotational member 14 or the sliding part 10, respectively, in a selected position in relation to the translational part 11 or the hinge 7, respectively.
• the locking mechanism consists of a bolt 44 having a threaded end fitted to a threaded bore 45 in the ring and with an end 46 which is intended for abutting with a certain force on the outer circumference of the wheel, said certain force being sufficient to prevent the wheel from turning in response to the spring force from the spiral spring.
• the bolt 44 When the bolt 44 is rotated the end of the bolt is forced against the outer circumference of the wheel.
• the bolt also has an elongated head 47 to be used as finger grip for rotating the bolt in order to either tighten or release the certain force towards the outer circumference of the wheel.
• the bolt is spring loaded but still having an end which is intended for abutting with a certain force on the outer circumference of the wheel, said certain force being sufficient to prevent the wheel from turning in response to the spring force from the spiral spring.
• the spring load of the bolt is intended for supplying the certain force by forcing the entire bolt and thus also the end of the bolt against the outer circumference of the wheel.
• the bolt also has an elongated head to be used as finger grip, but not for rotating the bolt, but for pulling the end of the bolt away from the outer circumference of the wheel in order to release the certain force applied by the spring towards the outer circumference of the wheel.
• both the rotational member and the sliding part are biased towards an upper position of the translational part and an upper position in relation to the hinge, respectively.
• either only the rotational member or the hinge may be provided with biasing means for biasing only one of these members towards an upper position of the translational part or the sliding part, respectively.
• neither the rotational member nor the hinge is provided with biasing means.
• Fig. 5 is an exploded view of a second embodiment of an arm according to the invention 5 for a support according to the invention.
• the arm 2 comprises the sliding part 10 and the translational part 11.
• the sliding part 10 is attached to the hinge 7 by means of a bolt 16 extending through the groove 15 in the sliding part.
• the bolt 16 secures the arm 2 to the hinge 7 and guides the sliding displacement between the arm and the hinge.
• the hinge like the hinge shown in fig. 4, is provided with rails 10 19 extending upwards and downwards and being intended for running in the groove 15 as a supplementary guide of the sliding part and the arm in relation to the hinge.
• the arm is provided with a handgrip 48 for locking the sliding part 10 in an upright position in relation to the hinge 7.
• the handgrip 48 is kept in place in relation to the hinge 7 by pawls 49 engaging with slots (not shown) provided in the hinge.
• the handgrip 48 will slide along an outer surface of the sliding part 10.
• pointed ends 50 of the handgrip 48 will engage with slots 51 provided in the sliding part so that the pointed ends 50 of the handgrip
• the handgrip 48 must be activated and the pointed ends 50 of the handgrip being released from the slots 51 if the sliding part is to be displaced from the most upright position.
• the rotational member 14 constitutes a displaceable means and comprises a circular 5 base plate 18 onto which the interface (not shown) is to be secured by means of a number of fastening means such as six bolts 20 as shown, and the rotational member 14 furthermore comprises a circular guide plate. Both the base plate 18 and the guide plate 21 are exactly similar to the ones shown in fig. 4, and fig. 4 is hereby incorporated by reference in order to describe these elements and their function. 30
• the translational part 11 and the sliding part 10 are not provided with biasing means for biasing the rotational member towards an upper position in relation to the translational part and for biasing the hinge towards an upper position in relation to the sliding part.
• both the translational part 11 and the 5 sliding part 10 are provided with fastening means which is capable of only locking the rotational element and the hinge in selected stepwise positions along the translational element and the sliding element, respectively.
• the locking means for the rotational member and for the hinge are basically similar.
• the fastening means consists of a specially designed leaf spring 52, the middle of which is provided with a pawl 53 intended for engaging with one of more corresponding slots 54 in the translational part 11 and the sliding part 10, respectively.
• a specially designed leaf spring 52 the middle of which is provided with a pawl 53 intended for engaging with one of more corresponding slots 54 in the translational part 11 and the sliding part 10, respectively.
• the slots 54 in the translational part 11 are shown. Because the slots are provided at the inner surfaces of the translational part and the sliding part, respectively, and are not extending all the way through the parts, the slots of the sliding part cannot be seen in the figure.
• the leaf springs 52 are located in a guide plate 55 and a rear cover 56.
• the rear cover 56 of the sliding part 10 and also the guide plate 55 and the leaf spring 52 for the sliding part 10 are secured to the hinge 7 by a bolt 16 extending through the hinge 7 and through the groove 15 in the sliding part 10 to a nut (not shown) in a central plug 57 extending through a rectangular hole 58 in the rear cover 56 and through a rectangular hole 59 in the guide plate 55.
• the rear cover 56 of the translational part 11 and also the guide plate 55 and the leaf spring 52 are secured to the interface (not shown) by a specially designed bolt 28 being provided with an external thread and extending through a ring-shaped hole 60 in the rear cover 29, through a rectangular hole 61 in the guide plate 55, through the groove 24 in the translational part 11 and through the rotational member 14 to a back of the interface and engaging with a corresponding internal thread in the back of the interface.
• the guide plate 55 is provided with rails 62 intended for running in the groove 24,15 of the translational part 11 and the sliding part 10, respectively.
• the guide plate 55 is furthermore provided with an aperture 63 in which the leaf spring 52 is embedded.
• the aperture 63 has a width and a length substantially the same as a width and a length of the leaf spring 52 so that the leaf spring will follow the guide plate 55 closely when the guide plate is displaced along the translational part and the sliding part, respectively.
• the rear cover 56 is provided with a recess 64 having the same dimensions as the aperture 63 of the guide plate and the leaf spring 52 is also embedded in this recess 64 and kept enclosed between the rear cover 56 and the translational part 11 and the sliding part 10, respectively.
• Fig. 6 is an exploded view of a third and preferred embodiment of an arm according to the invention for a support according to the invention.
• the arm 2 comprises the sliding part 10 and the translational part 11.
• the sliding part 10 is attached to the hinge 7 by means of a two bolts 65 extending through holes 66 in the hinge 7 and through the groove 15 in the sliding part 10.
• the bolts 65 secure the arm 2 to the hinge 7 and guides the sliding displacement between the arm 2 and the hinge 7.
• the hinge unlike the hinge shown in fig. 4 and fig. 5, is provided with rollers 67, which are equipped around the bolts 65 and extend along the bolts 65 through the groove 15.
• the rollers 67 constitute guides for the sliding part 10 in relation to the hinge 7.
• the bolts 65 are secured to threaded holes (not shown) in a front plate 68 provided oppositely the hinge 7 in relation to the sliding part 10.
• the guide plate 21 is attached to the translational part 11 by means of two bolts 69 extending through holes 70 in a rear plate 71 and through the groove 24 in the translational part 10.
• the bolts 69 secure the interface (not shown) and thus the guide plate 21 to the translational part 11 and guides the sliding displacement between the guide plate 21 and the translational part 11.
• the guide plate 21 unlike the guide plate shown in fig. 4 and fig. 5, is provided with rollers 72, which are equipped around the bolts 69 and extend along the bolts 69 through the groove 24.
• the rollers 72 constitute guides for the guide plate 21 in relation to the translational part 11.
• the bolts 69 are secured to threaded holes (not shown) in the guide plate 21 , which in relation to the rear plate is provided oppositely the translational part 11.
• the hinge 7 is provided with recesses 73 intended for receiving pads 74.
• the pads 74 abut the rear surface (not shown) of the sliding part 10, when the hinge 7 by means of the bolts 65 is secured to the sliding part 10.
• the pads 74 have an extension out of the recesses 73 ensuring establishment of a small distance between the hinge 7 and the rear surface of the sliding part 10.
• the pads 74 are made of a material also ensuring sufficiently low friction for the person performing mutual displacement of the two parts 7,10, when sliding the sliding part 10 in relation to the hinge 7.
• the rotational member 14 constitutes a displaceable means and comprises a circular base plate (not shown) similar or identical to the base plate 18 shown in fig. 4 and fig. 5, and onto which the interface (not shown) is to be secured by means of a number of fastening means such as six bolts 20 as shown in fig. 4 and fig. 5.
• the rotational member 14 furthermore comprises the circular guide plate 21.
• the base plate (not shown) is preferably exactly similar to the one shown in fig. 4 and fig. 5, and fig. 4 and fig. 5 is hereby incorporated by reference in order to describe this element and its function.
• the guide plate 21 is almost identical to the guide plate 21 shown in fig. 4 and fig. 5. The only difference is that the guide plate 21 shown in fig. 6 is provided with an axle 75 embedded in a bearing 76. The axle 75 and the bearing 76 establish a distance between a front surface of the translational part 11 and a rear surface (not shown) of the guide plate 21.
• neither the third embodiment as shown has a translational part 11 and a sliding part 10 provided with biasing means for biasing the rotational member towards an upper position in relation to the translational part and for biasing the hinge towards an upper position in relation to the sliding part.
• both the translational part 11 and the sliding part 10 are provided with fastening means, which is capable of only locking the guide plate 21 and thus the rotational element (not shown) and the hinge 7 in selected stepwise positions along the translational element 11 and the sliding element 10, respectively.
• the locking means for the rotational member and for the hinge are identical and will be described commonly.
• the fastening means consists of specially designed pawls 77 biased towards front surfaces of the sliding part 10 and the translational part 11 , respectively.
• the pawls 77 are intended for engaging with one of more corresponding slots 78 provided along the grooves 15,24 of the sliding part 11 and the translational part 10, respectively.
• both the slots 78 in the translational part 11 and in the sliding part 10 are shown.
• the slots 78 are provided at the front surfaces of the sliding part 10 and the translational part 11 , respectively, and are not extending all the way through the parts 10,11.
• the pawls 77 cannot extend all the way through the parts 10,11 , although biased towards the slots 72.
• Biasing of the pawls 77 towards the slots 78 in the sliding part 10 and the translational part 11 , respectively, may take place by any suitable biasing means (not shown) such as a spiral spring, a rubber spring member or any other resilient member.
• a suitable biasing means such as a spiral spring, a rubber spring member or any other resilient member.
• the resilient member is provided between a rear surface of the
• the resilient member (not shown) is provided between the rear surface (not shown) of the guide plate 21 and a recess 79 in the pawl 77, said recess being directed towards the guide plate 21.
• the pawl is provided with an exteriorly threaded tenon 80 extending through the groove 15,24 and a fingerknob
• the fingerknob 81 and the pawls 77 are intended for mutual engagement by screwing the fingerknob 81 onto the tenon 80 of the pawl 77.
• the biasing of the pawls 77 towards the slots 78 may be overcome by pushing the fingerknob 81 , and thus the pawl 77, against the resilient member.
• the front plate 68 is provided with recesses (not shown) similar to the recesses 73 shown in the hinge 7.
• the recesses of the front plate 68 are directed towards the sliding part 10, which is why they are not shown.
• the recesses of the front plate 68 are intended for receiving pads 82. The pads 82 abut the front surface of the sliding part 10, when the
• hinge 7 is attached to the sliding part 10. As mentioned, attachment of the hinge 7 to the sliding part takes place by means of the bolts 65 extending through the holes 66 in the hinge 7, further on through the groove 15 and into threaded holes (not shown) in the front plate 68.
• the pads 82 have an extension out of the recesses of the front plate 68 ensuring establishment of a small distance between the front plate 68 and the front surface of the
• the pads 82 are made of a material also ensuring sufficiently low friction for the person performing mutual displacement of the two parts 7,10, when sliding the sliding part 10 in relation to the hinge 7.
• Resilient members such as disc springs 73 as shown or the like resilient members are 5 embedded in the recesses of the front plate 68. These disc springs or other resilient members bias the pads 82 towards the front surface of the sliding part 10. Due to the mutual engagement between the front plate 68 and the hinge 7 along the bolts 65, the disc springs 83 or other resilient member also bias the pads 82 towards the front surface of the sliding part 10. The biasing force of the pads 74,83 towards the rear surface and 10 the front surface, respectively, of the sliding part 10 is adjusted by adjusting the tightening of the bolts 65.
• the rear plate 71 related to the translational part 11 is also provided with recesses 84 similar to the recesses (not shown) of the front plate 68 and similar to the recesses 73
• the recesses 84 the rear plate 71 are directed towards the translational part 11.
• the recesses 84 of the rear plate 71 are intended for receiving pads 85.
• the pads 85 abut the rear surface of the translational part 11 , when the guide plate 21 is attached to the translational part 11. As mentioned, attachment of the guide plate 21 to the translational part 11 takes place by means of the bolts 69 extending through the holes
• the pads 85 have an extension out of the recesses 84 of the rear plate 71 ensuring establishment of a small distance between the rear plate 71 and the rear surface (not shown) of the translational part 11.
• the pads 85 are made of a material also ensuring sufficiently low friction for the person performing mutual
• Resilient members such as disc springs 86 as shown or the like resilient members are embedded in recesses (not shown) in the guide plate 21. These disc springs 86 or other

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