HANDLE FOR A WINDING ASSEMBLY AND LOCKABLE CHAIN WINDER ASSEMBLY Field of the Invention 5 This invention relates to a device for attaching a handle to a winder assembly and also to a lockable chain winder assembly. Background of the Jivention Winding mechanisms that are used to move a structure from a first position to another position, such as a window or blind, are generally installed with the structure for 10 transportation to save the need to reassemble the winding mechanism on the structure at the destination. In some instances a number of assemblies, such as panes of glass or window frames, are packed closely together for transportation. In such a situation, the handles that are attached to the winding mechanisms protrude away from the structure to which the winding mechanism is attached and can interfere with an adjacent structure 15 during transportation. The projection of the handle can lead to damage to adjacent structures as well as the structure to which it is secured. In order to overcome this problem prior art devices, such as those disclosed in Australian Patent Nos. 739414 and 691519, include handles that can be folded to a position in which the handles are not used. However, in order to move the handle from 20 the in-use position to a non-use position requires a user to pull the handle against the force of a spring or otherwise separate one component from another in order to move the handle to the stowed or non-use position. Apart from having complex machined components, the handle is generally stowed in a position which remains attached to the shaft or spindle that in turn is connected to a drive gear in order to move the structure 25 from one position to another position.
Another arrangement disclosed in Australian Patent Application. No. 2005201409 has a complex series of components which requires aligning a clutch shaft with a pin in order to position the pin within a channel so as to rotate the handle about an axis and position the handle in an out of use position. The extent to which the handle can be 5 moved around a lever to which it is normally connected is governed by the position of corresponding protrusions on each of the lever and an inner part of the handle. Furthermore the handle in an out of use position remains firmly attached to the lever and can only be removed by the removal of a cap. In the above described arrangements where the handle remains attached to its 10 associated spindle, problems arise during transportation of a number of structures having winding assemblies attached in that the fixture of the handle can still take up space especially when a series of structures are closely located during transportation. A number of lockable chain winders, particularly for windows, have been previously disclosed. An example of such a mechanism is disclosed in Australian patent 15 No. 2005100843 in the name of the present applicant. This discloses a winder mechanism that has a complex arrangement of parts in the locking section in order to allow a locking member to move into and out of engagement with a driven gear that is coaxially attached to a sprocket used to drive a chain into and out of the winder housing so as to open and close a structure, for example, a window. The locking mechanism 20 includes a bar which is brought into a corresponding slot in order to hold a button, which is user operated, in a depressed position in order to lock the locking member. This provides a particular disadvantage in the number of components that has to be manufactured, which also adds to the cost of manufacturing a winder assembly. 2 The above references to and descriptions of prior proposals or products are not intended to be, and are not to be construed as, statements or admissions of common general knowledge in the art in Australia. The present invention seeks to provide an improved winder handle assembly and 5 lockable chain winder assembly. Summary of the Invention According to a first aspect of the invention, there is provided a device for attaching a handle to a winder assembly including: a detent protruding through a boss attached to an arm of the handle, the boss 10 having an internal socket for receiving a member of the winder assembly; and biasing means engageable with the detent; wherein the biasing means enables the detent to move in a first direction upon contact with a first portion of the member of the winder assembly as the member is inserted into the socket, the biasing means further enables the detent to move in a second direction, 15 opposite to the first direction, after the first portion has passed the detent upon further travel of the first portion in the socket such that the detect protrudes into a second portion of the member and thereby secures the handle to the winder assembly The first portion of the member may be a flange and the second portion of the member may be a recess adjacent the flange. Prior to insertion of the member into the 20 socket, the detent preferably has a head positioned within the socket urged by the biasing means in the second direction. Upon contact of the first portion with the detent, the detent may be forced to move in the first direction away from a central axis of the socket against the biasing means. 3 The head may have a front-facing surface which is bevelled and shaped to conform to an internal surface of the socket, the front-facing surface of the head can assist the first portion of the member to force the detent to move in the first direction. The internal socket of the boss may have a series of alternating ribs and grooves 5 that engage with corresponding grooves and ribs on the member to enable rotation of the member as the handle is rotated. The detent preferably has a projection surrounded by the biasing means in use, the biasing means being affixed to the handle by a fastener. The detent preferably has a shoulder intermediate the projection and the head, the shoulder abutting against an exterior wall of the boss under the force of the biasing 10 means. In order to detach the handle from the member of the winder assembly, the detent can be moved in the first direction until the member is able to be released from the detent. The shoulder of the detent may be biased in the second direction until the first portion of the member is able to be released from the head of the detent. 15 According to a second aspect of the invention, there is provided a handle assembly for releasable attachment to a. winder assembly including: an arm; a first boss located at one end of the arm; a second boss located at the other end of the arm; 20 a detent protruding through the first boss, the first boss having an internal socket for receiving a member of the winder assembly; and biasing means engageable with the detent; wherein the biasing means enables the detent to move in a first direction upon contact with a first portion of the member of the winder assembly as the member is inserted into 25 the socket, the biasing means further enables the detent to move in a second direction, 4 opposite to the first direction, after the first portion has passed the detent upon further travel of the first portion in the socket such that the detent protrudes into a second portion of the member and thereby secures the handle to the winder assembly According to a. third aspect of the invention, there is provided a lockable chain 5 winder assembly for opening and closing a structure, the assembly including: a housing; a chain attached to the structure and moveable into and out of said housing; a sprocket located within the housing and engageable with said chain to move the chain into and out of said housing; 10 a drive mechanism for rotating the sprocket in two rotational directions, the drive mechanism including a driven gear attached to the sprocket and a drive gear that engages with the driven gear so that in use the drive gear imparts reversible rotary motion to the driven gear and to the sprocket; a locking mechanism operable to prevent rotation of the driven gear and sprocket Is in at least one of the rotational directions, the locking mechanism including a lock member operable to engage the driven gear so as to prevent rotation of the driven gear and sprocket in said at least one rotational direction, the lock member having an opening formed therein and bounded on one side by a flange of the lock member, the locking mechanism further including a locking head having a recess, the locking head adapted for 20 movement to a first position in which the flange resides in the recess to enable the lock member to prevent said rotation of the driven gear in said at least one rotational direction, the locking head adapted for movement to a second position to enable the lock member to retract from engagement with the driven gear and thereby allow movement of the driven gear and sprocket in both rotational directions. 5 The locking head may form part of a button that is pressed by a user to move the locking head into the first position. The lockable chain winder assembly may further including a lock barrel having a protuberance, whereupon turning the lock barrel the protuberance contacts the lock member to retract the flange from the recess and thereby 5 disengage the lock member from the driven gear. Upon retraction of the flange from the recess, the locking head has a side that preferably engages with the flange in the second position while the locking head is positioned in the opening of the lock member to keep the lock member disengaged from the driven gear. The lock barrel and protuberance may return to an original position, under the 10 action of a biasing spring, after the flange has been retracted from the recess and the locking head is in the second position. Brief Description of the Drawings A preferred embodiment of the invention will hereinafter be described, by way of 15 example only, with reference to the drawings in which: Figure 1 is an exploded perspective view of the components of a handle for attachment to a winding assembly; Figures 2A, 2B and 2C shows the progressive insertion of a winder assembly member into the socket of a boss of the handle until the handle is affixed to the winder 20 assembly; Figure 3 is an exploded perspective view showing the assembled handle and the various components of a winder assembly; Figure 4A is a perspective view from above of an assembled winder assembly in a locked condition; 25 Figure 4B is a plan view of the assembled winder assembly of Figure 4A in the locked condition; and 6 Figure 5 is a plan view of the assembled winder assembly in an unlocked condition. Detailed Description of the Preferred Embodiment With reference to Figure 1 there is shown separate components of a handle (2) for 5 attachment to a window winder assembly. The handle (2) includes ann (4) which has a first boss (6) attached one end and a second boss (8) at an opposite end. The first boss (6) has a bore (10) therethrough for receiving a locating pin (12) which secures knob (14) to boss (6). The second boss (8) has an internal socket (16) surrounded by a first flange (18) and a cylindrical portion (20) 10 around which the first flange (18) is formed, The cylindrical portion (20) presents a second flange (21) which is smaller in diameter than the first flange (18). The socket or cavity (16) protrudes through the cylindrical portion (20) and first flange (18) with a cap formed at the opposite side of boss (8) to cavity (16) so that effectively the cavity (16) is a blind bore. Inside the cavity (16) on the inside wall of the cylindrical portion (20) are a 15 series of ribs (22) separated by grooves (24). Each of the ribs (22) and grooves (24) extend substantially parallel to axis (26). The outer housing of the handle (2), including the knob (14) and first flange (18) may be made from suitable plastics material. The cylindrical portion (20) and detent (44) (to be described) may be made from suitable metal such as steel. 20 Member (28), which may be part of a winder assembly, is adapted to fit in cavity (16) such that flange (30), recess (32) and toothed wheel (34) are co-located in the cavity (16). The toothed wheel (34) has corresponding ribs (36) and grooves (38) for engagement with corresponding grooves (24) and ribs (22) in cavity (16). The member (28) has body portion (40) and a drive gear (42) in the form of a worn- gear. The worm 7 gear (42) is adapted to drive a further gear which is attached to a sprocket of the winding assembly to be described with reference to Figure 2. Detent (44) has a head portion (46) which is adapted to fit through an aperture (48) in the wall of first flange (18) of the second boss (8). A rear projection (50), in the 5 form of a cylindrical projection, is angled downwardly from body (52) of detent (44) and receives biasing means in the form of a spring (54) which has a looped end (56) adapted to fit over fastener (58). The fastener (58), typically in the form of a screw, is adapted to fit into a threaded bore (60) formed in ar (4). The detent (44) once inserted through the aperture (48) has the head portion (46) 10 extending into the cavity (16). The body (52) has a shoulder that abuts the outer wall of the first flange (18) so that no further movement into the cavity (16) of the detent (44) and head portion (46) is possible. The spring (54) which encircles projection (50) is secured to arm (4) through the fastener (8). It is biased in a second direction to force detent (44) into cavity (16) such that the body (52) and its shoulder abuts against the 15 outer wall of the first flange (18). The head portion (46) has a front-facing surface (47) which is curved and bevelled such that it substantially conforus to the shape of the internal surface of the socket (16) and to the edge of flange (30) of member (28). It is bevelled in a direction from top surface (62) to underneath surface (64). This is so shaped such that upon 20 insertion of the member (28) into the cavity (16) the bevelled surface (47) enables the flange (30) to be forced past the detent (44) such that with further application, it compresses spring (54) so that the detent (44) moves slightly outwardly of the first flange (18) in a first direction until the flange (30) passes the head portion (46). Thereafter the detente (44) then springs back into its biased position in the second, opposite direction to 25 reside behind flange (30) within recess (32). This prevents outward movement of member (28) from the cavity (16) and secures the handle (2) to the winding assembly. To assist in the process of the flange (30) sliding past the detent (44), the top face (62) may be slightly angled or bevelled from the body (52) to the head (front-facing) surface (47). In this way the flange (30) can slide easily along the face (62) and then along the 5 bevelled front-facing surface 47 of the head portion (46) to be able to compress the spring (54) and thereby move the detent (44) outwardly until the flange (30) is past the detent (44). In order to release the handle (2), a user may use their finger or finger nail, or a screwdriver, key, pen or other implement by raising the body (52) away from the exterior 10 wall of the first flange (18) and releasing the member (28) from the cavity (16). The user will then be in a position to either retain the handle (2) until transportation has been completed of the structure to which the handle (2) is fitted. Alternatively the user can position the handle (2) in another orientation around the member (28) such that the knob (14) and arm (4) are in a different location away from adjacent structures that are being 15 transported. When the detent (44) is retracted under the action of the shoulder (30) being forced in cavity (16), when attaching the handle (2) to member (28), the cylindrical projection (50) which is covered by spring (54) has room to move backwardly within a recess of arm (4) as the spring (54) compresses. The spring (54) compresses due to the 20 backward movement of the bead portion (46) and body (52) of the detent (44) against the fixed fastener (58) to which the loop (56) of the head of the spring (54) is attached. Referring to Figure 3 there is shown the assembled handle (2) which is fitted to member (28). The member (28) is affixed to and resides within the housing (66) of the winder assembly and the drive gear (42) interacts and meshes with driven gear (68) 25 which in turn drives the sprocket (70). Drive gear (42) is rotated under the action of 9 turning the knob (14) or handle (2). Rotation of the sprocket (70) imparts movement to a chain (72) in order to move bracket (74) which is attached to a structure to be opened and closed, such as a window, so that the motion imparted to the bracket (74) forces the opening or closure of the structure depending on the direction of travel of the chain (72). 5 The chain (72), when not in use, is stored. within the housing (66) which has connected to it a base plate (76) through a series of screws (78). A guiding sprocket (80) is housed at an opposite end of the housing (66) to sprocket (70) to act as a guide for the chain as it is stored within the housing (66). Sprocket (70) and driven gear (68) fit within a chain guide member (82) which keeps both the sprocket 70 and driven gear 68 in io position as the driven gear (68) interacts with the drive gear (42) and locking mechanism of which lock member (84) is a part. The other part of the locking mechanism is button (86). The lock member (84) includes an elongate arm (88) that ends in a pawl element (90) having a ramp surface (92). Integrally connected to the aTrm (88) is a body section (94) and attached at an opposite end of the body section (94) is a projection (96) in the 15 form of a tail A bias spring (98) fits over the tail (96) and the tail (96) is secured within the housing (66). The bias spring (98) biases the lock member (84) into a locking position such that the arm (88) engages between adjacent teeth of driven gear (68). The body section (94) includes an opening (100) which is partly formed by a flange (102) and a section(104) of arm (88). Preferably the lock member (84) is formed as a unitary 20 construction. BLtton (86) bas an. outer member (106) that resides outside housing (66) and is adapted as a finger push button operation by a user. At the other end of the button (86) there is located a locking head in the form of a tongue (108) having side (110) and recess (112). The recess (112) is formed by three sides (114), (116) and (118) cut into tongue 25 (108) in a substantially U-shaped formation (best seen in Figure 4B). Spring (120) is 10 used to bias the button (86) in a direction outwardly of the housing (66). The tongue (108) interacts with flange (102) of lock member (84), to be described hereinafter, in order to bring into and out of engagement the arm (88) from the driven gear (68). Also shown in Figure 3 is a lock barrel (122) operated by key (124). The lock barrel (122) has 5 a protuberance (125) which interacts with a portion of the lock member (84). Biasing spring (126) is connected to the protuberance (125) at one end and is affixed to the internal surface of the housing (66) by a plate (128) and screw (130) at an opposite end thereof. In the middle section of spring (126) it is supported by a fork which forms part of the housing (66). 10 With reference to Figures 4a and 4b there is shown the chain winder assembly (3) in a locked position such that flange (102) of lock member (84) extends into recess (112) associated with tongue (1.08). A ramp surface (133) of flange (102) engages with side (114) which bounds part of recess (112) to prevent an outward movement of button (50) under the force of spring (1.20). In this locked arrangement, aun (88) and more Is particularly pawl element (90) extends between adjacent teeth of driven gear (68) to prevent rotation of sprocket (70) in an anti-clockwise direction. However, due to the ramp surface (92) of pawl element (90), rotation of the sprocket 70 is still possible in a clockwise direction in order to wind the structure such as a window, in one direction, such as inwardly to close the window. 20 In order to release the lock member (84) from driven gear (68) a user turns the key (124) in a clockwise direction as is shown by arrow (132). This in turn moves protuberance (125) against a downwardly extending face (134) of lock member (84) to force the lock member (84) out of engagement with the driven gear (68) against the tension in spring (98), such that spring (98) is compressed. During this process the 25 flange (102) exits recess (112) until such time it is clear of the recess (112) when the
SI
action of spring (120) forces the button (86) and tongue (108) outwardly to a position such that side (110) engages against surface (136) of flange (102). This is shown in Figure 5 with the tongue (108) positioned in the opening (100). In this position the lock member (84) is held against the force of spring (98) in a position such that it is clear of 5 the teeth of the driven gear (68). Thus the sprocket 70 can be rotated in either direction so that for example the window can be opened and closed in this unlocked position. Once the side (110) has engaged against face (136) of flange (102), the key (124) is returned to its position as shown in Figure 4a and 4b under the action of spring (126) which forces protuberance (125) back to its original position. Thus the spring (126) is 10 biased to return the protuberance (125) to its original position. To lock the winder assembly again it is a matter of the user pressing button (86) which forces tongue (108) inwardly until the flange (102) is locked into the recess (112) again under the tension applied by spring (98) to the lock member (84). Is 12