Abstract: A screen retraction mechanism for a retractable screen assembly, the screen retraction mechanism comprising: a roller housing; a roller spinably mounted within the roller housing and for rolling a screen material sheet thereon; a torsion spring coupled to the roller for rotationally biasing the roller; and a tension adjuster coupled to an end of the torsion spring and configured to move in and out of engagement with the roller housing, wherein the tension adjuster is spinnable to selectably tension the torsion spring when out of engagement with the roller housing.

Abstract: A brake arrangement, for a retractable screen arrangement in which the a screen roller applies a retraction force to the screen and brake arrangement, includes a brake arrangement, for providing a braking force between the brake arrangement and a track which guides the brake arrangement, to resist retraction. The brake arrangement provides a brake member with a friction surface for contacting the bearing surface; a brake member support for supporting the brake member; and a forcing arrangement for forcing the friction surface against the bearing surface. The forcing arrangement includes a biasing arrangement for biasing the friction surface onto the bearing surface, and a force-increasing arrangement for increasing the force with which the friction surface engages the bearing surface. The force increasing arrangement converts a frictional force between the friction surface and the track into additional contact pressure force of the friction surface onto the guide track.

Abstract: A retractable screen that is integrated within a wall cavity and fixed to an internal door frame. The screen has a base frame mounted to the support. The base frame comprises a lower elongate member a U shaped upper elongate member and two U shaped side elongate members each having an upper part and a lower part respectively fixed to the upper and lower elongate members. A lower guide track is mounted to the lower elongate member. An upper guide track assembly is mounted within the upper elongate member. The upper guide track assembly includes an elongate insert member with an upper guide track mounted therein and the elongate insert member is configured for insert installation into the upper elongate member. The side elongate members house a roller assembly for a screen.

Abstract: A brake arrangement, for a retractable screen arrangement in which the a screen roller applies a retraction force to the screen and brake arrangement, includes a brake arrangement, for providing a braking force between the brake arrangement and a track which guides the brake arrangement, to resist retraction. The brake arrangement provides a brake member with a friction surface for contacting the bearing surface; a brake member support for supporting the brake member; and a forcing arrangement for forcing the friction surface against the bearing surface. The forcing arrangement includes a biasing arrangement for biasing the friction surface onto the bearing surface, and a force-increasing arrangement for increasing the force with which the friction surface engages the bearing surface. The force increasing arrangement converts a frictional force between the friction surface and the track into additional contact pressure force of the friction surface onto the guide track.

Abstract: An upper guide track assembly for a retractable screen is described. The assembly comprises a U shaped guide channel, a track attachment member for attaching the assembly to a support, a track outer member connectable to the attachment member and a screen retaining member within the guide channel. The retaining member receives and retains an upper edge of a screen. The retaining member has two resilient wings extending from either side of the body. Each wing is biased towards a position in which the distal end of each wing is away from the body. The wings are moveable against the bias to a retracted position. When the retaining member is retained in the guide channel, each wing is held in the retracted position against the bias. This allows an upper edge of a screen retained by the screen retaining member to be biased in the vertical direction.

Abstract: An upper guide track assembly for a retractable screen is described. The assembly comprises a U shaped guide channel, a track attachment member for attaching the assembly to a support, a track outer member connectable to the attachment member and a screen retaining member within the guide channel. The retaining member receives and retains an upper edge of a screen. The retaining member has two resilient wings extending from either side of the body. Each wing is biased towards a position in which the distal end of each wing is away from the body. The wings are moveable against the bias to a retracted position. When the retaining member is retained in the guide channel, each wing is held in the retracted position against the bias. This allows an upper edge of a screen retained by the screen retaining member to be biased in the vertical direction.

Abstract: The disclosure relates to the field of providing a flexible screen which is extensible and retractable across an opening. It is desirable to provide a bottom guide track which is convenient to fit and with a low profile. The disclosed guide track arrangement provides an elongate mounting member for securing to a support that forms part of the opening, and which provides at least one elongate connection recess; and an elongate track member, formed separately from and attachable to the mounting member, and having a track region with an elongate guide recess for slidingly retaining an edge of a flexible screen. The track member has at least one engagement part engageable into the complementary connection recess by lateral movement of the track member to connect the track member to the mounting member.

Abstract: A syringe including a barrel for containing a fluid, a needle associated with the barrel and in fluid communication therewith, a first plunger adapted to be contained at least partially within the barrel and movable relative thereto, a second plunger located at least partially externally to the barrel and movable relative thereto wherein the first plunger is releasably engaged with the second plunger, and wherein depression of the second plunger moves the first plunger to expel fluid contained within the barrel, and further depression of the second plunger frees the first plunger for movement relative to the second plunger from a use condition to a storage condition in which the needle is wholly contained within the barrel.

Abstract: A syringe including a barrel for containing a fluid, a needle associated with the barrel and in fluid communication therewith, a first plunger adapted to be contained at least partially within the barrel and movable relative thereto, a second plunger located at least partially externally to the barrel and movable relative thereto wherein the first plunger is releasably engaged with the second plunger, and wherein depression of the second plunger moves the first plunger to expel fluid contained within the barrel, and further depression of the second plunger frees the first plunger for movement relative to the second plunger from a use condition to a storage condition in which the needle is wholly contained within the barrel.

Abstract: A blood collection device comprises an open ended syringe like housing into which a vacutainer can be inserted. The front of the device contains a needle holder and a double ended needle. The needle holder is attached to the device in a special manner that enables the needle holder to be decoupled and retracted into the device but only after the vacutainer has been removed and a separate needle retraction device has been inserted into the open end of the housing and pushed against the inner end of the needle holder. The needle retraction device comprises a hollow body which is under vacuum and which has an open end closed by a piston. The piston is of a special design that functions to decouple the needle holder from the blood collection device and to lock to the needle holder and at the same time to be decoupled from the hollow body the result of which is that the piston containing the needle holder and the attached contaminated needle is sucked back into the hollow body to render the needle safe.

Abstract: A medical device having a main body, an actuator and a needle, the needle able to be retracted into the main body, the main body having a chamber which is under reduced pressure or can be placed under reduced pressure, the needle attached or attachable to a retraction member movable between a forward position with the needle extending from the main body and a retracted position with the needle within the main body, the retraction member additionally movable between a held position preventing retraction and a release position where rotation of the actuator allows the retraction member to be retracted into the vacuum chamber by the reduced pressure of the chamber.

Abstract: A blood collection device comprises an open ended syringe like housing into which a vacutainer can be inserted. The front of the device contains a needle holder and a double ended needle. The needle holder is attached to the device in a special manner that enables the needle holder to be decoupled and retracted into the device but only after the vacutainer has been removed and a separate needle retraction device has been inserted into the open end of the housing and pushed against the inner end of the needle holder. The needle retraction device comprises a hollow body which is under vacuum and which has an open end closed by a piston. The piston is of a special design that functions to decouple the needle holder from the blood collection device and to lock to the needle holder and at the same time to be decoupled from the hollow body the result of which is that the piston containing the needle holder and the attached contaminated needle is sucked back into the hollow body to render the needle safe.

Abstract: A device is disclosed that allows a puncture needle to be inserted into a catheter. Once the puncture needle has performed its function, it can shoot back into the device such that there is a reduce likelihood of needlestick injury. Vacuum is used to assist in the shoot back function.