REEL LATCHING MECHANISM

Abstract: A reeling device including a reel (2) for holding, paying out and winding in a linearly extendable, flexible member, a spring (85) for biasing said reel in a recoil direction (40) of rotation for winding in said member and a latching mechanism including a pawl (31) locatable in a recess (27) in a latch (26) to prevent recoil in the recoil direction (40) and ramp surfaces (22) to put the pawl (31) in a condition to engage the latch (26) and projections (37) to put the pawl (31) out of a condition to engage the latch (26); wherein during paying out in the opposite direction (41) the pawl (31) is sequentially and repetitively put into and out of condition to engage the latch (26).

Description: This invention relates to a latching mechani and to a reeling device. The reeling devices in accordance with this invention can be used to reel anything * desired but mos application will be found in reeling hoses or electric cable or flex. The present invention provides in one aspect a reeling device including a reel for holding, paying out and winding in a linearly extendable, flexible mem • means for biasing said reel in a direction of rotation for winding in said member and a latching mechanism adapted to prevent winding in of said member and constructed and arranged such that on paying out said latching mechanism is sequentially and repetitively pu into and out of condition to prevent winding in of sai member. Preferably there is a first means for putting the latching mechanism into said condition and a second means for putting the latch mechanism out of said condition. Said first means and said * second means may be associated with the reel or with a casing or suppor for the reel . The latching mechanism may include a ratchet wheel and a pawl . The pawl is preferably biased by an over-the-centre mechanism to be in a first or a second position in which it can and cannot engage with the rat wheel to prevent winding in of said member. The ratche wheel may have a ramp surface for moving the pawl from the first position to the second position and means for moving the pawl from the second position to the first position may also be associated with the ratchet wheel but at an angularly rotated position. The latching means may be able to latch one o more times per rotation of the reel. Constructions of latching mechanisms and wind devices in accordance with this invention will now be described with the aid of the accompanying drawings in which: Fig. 1 is a side elevation of* a latching •mechanism forming part of a winding device, Fig. 2 is a cross-section through the mechanis of Fig. 1 and shows parts of the winding device, Fig. 3 is a side elevation of another latching mechansim forming part of another winding device, and Fig. 4 is a cross-section through the mechanis of Fig. 3 and shows parts of the winding device. The latching mechanism and winding device show in Figs. 1 and 2 comprises an outer casing of which one part 1 is shown and a drum or reel of which one part 2 is shown which is mounted to the casing on a shaft 3 to rotate thereon. The shaft 3 is fixed against rotation. A cam plate 4 is mounted on the shaft 3 and is free to rotate on the shaft in the direction of the arro 6 but is restricted against rotation in the opposite direction by projections 7 on the shaft 3 ' which have abutment surfaces 8 and ramp surfaces 9, and flexible arms 21 on the cam plate 4 which can ride up the ramp surfaces 9 for rotation in the direction of the arrow 6 or abut against the abutment surfaces 8 to restrict against rotation in the opposite direction. The cam pla 4 has ramp surfaces 22 and recesses 23. Secured to the outer casing part 1 are abutments 24, an abutment 25 and a pivotally mounted latch 26 having a latching recess 27. The latch 25 may be gravity biased if oriented as shown or spring-loaded if some other mounting position is desired. Secured to the drum 2 at 180° spacings are two pawl mechanisms each comprising a pivotally πounted pawl 31, an over-the-cεntre 1ever 32 which passes through a guide 33 fixed to the drum 2 and a biasing spring 34. A abutment 36 and a projection 37 are carried by each pawl 31 and abutments 38 are carried by the drum 2. The abutments 24 are radially in line with the projections 3 Spring means, not shown, biases the drum 2 in the recoil direction indicated by arrow 40. The manner of operation of the winding device of Figs. 1 and 2 is as follows. Payout From a position in which a hose, cable or othe element is fully wound on the drum 2 the hose etc. is pull upon to pay out and turns the drum 2in the direction of th arrow 41 in Fig. 1. The pawls 31 will revolve about the shaft 3 in the direction of arrow 41 and will ride on the cam plate 4 and tend to urge it also in the direction of arrow 41 but such urging will be resisted by inter- engagement of the arms 21 and abutment surfaces 8. In consequence of riding on the cam plate 4 the pawls 31 will engage the ramp surfaces22 whichwi 11 move th pawls to the over-the-centre position shown in the upper part of Fig. 1 in which abutments 36 and 38 are in contac in which positions the pawls 31 are stable and out of contact with the cam plate 4. A pawl 31 in the over-the-centre position shown in the upper part of Fig. 1 moving in the direction of arrow 41 will move the latch 26 aside to the position sho by dash line 26A as it passes latch 26. Continued movement in the direction of arrow 4 of pawls 31 in the over-the-centre position will cause th projections 37 to engage the abutments 24 which will have the effect of returning the individual pawls 31 to the cam plate 4 contacting condition where they will again be acted upon by the ramp surfaces 22 to return to the over- the-centre position. Thus, pay out will continue with th pawls moving between the over-the-centre position and the cam plate 4 contacting condition. Recoi When both of the pawls 31 are in the cam plate 4 contacting condition recoil under the influence of the spring bias acting on the drum 2 can occur. In recoil the pawls 31 will locate in the recesses 23 and turn the cam plate 4 in the direction of arrow 6 which the drum 2 turns in the same direction (also arrow 40). The arms 21 and surfaces 8 do not restrict recoil. Latching To latch the drum 2 against recoil it is necessa that one of the pawls 31 in the over-the-centre position should locate in recesss 27. Such locating will occur if a pawl 31 has been moved to the over-the-centre position b the uppermost one (with respect to Fig. 1} of the surfaces 22. but has not yet contacted the right hand side one (with respect to Fig. 1) of the abutments 24 and thus has not yet come out of the over-the-centre position and has passe the latch 26, allowing that one of the pawls 31 to contact latch ' 26 by allowing the drum to move in the recoil directi indicated by the arrow 40 will cause the pawl to enter the recess 27 and move the latch 26 to contact the abutment 25 to prevent further movement of the pawl and the drum 2. If no pawl 31 is in a position to engage the latch 26 then slight movement (usually not more than 120°) of the drum 2 in the direction of arrow 41 will put one of the pawls 3.1 in the over-the-centre position for engaging the latch 26. The above described latch mechanism and winding device has the advantage that recoil can occur at any speed and that accidental latching is . unlikely to occur. Further, once latching has been freed it cannot reoccur in a recoil even if recoiling is stopped temporarily unless the drum 2 is first moved in the pay out direction through at least about 30°. The latch mechanism and winding device of Figs. 3 and 4 includes an outer casing 51, a shaft 52 supported by the outer casing 1 and a hose winding drum 53 mount on the shaft 52. Spring means (not shown) is mounted between the shaft 52 and drum 53 for the purpose of bi a hose wound on the drum for recoil. That spring mean may be tensioned as desired by rotating the shaft 52 a ' for this purpose the end 54 of the shaft 52 is flatten and received in a slot 56 in a body 57 which is rotatab with respect to the casing 51. The body 57 may be hel in a particular rotated position by screws passed throu holes 58 into the casing 51. Mounted to the drum 53 is a cam plate 61. Th cam plate 61 has recesses 62, ramp portions 63, pivotab levers 64 and abutments 66 and 67 defining the limits o movement of the levers 64. Mounted to the casing 51 is a pivotable latch having a projecting pin 72 and which is biased by an over-the-centre mechanism comprising a rod 73 which is spring loaded by a spring 74 and which passes through a guide 76 attached to the casing 51 and locates in a notch 77 in the latch 71. Abutments 78 and 79 define limits of movement of the latch 71. The latch 71 will be stable in the full line and dash line (71A) position shown in Fig. 3. The manner of operation of the winding device of Figs. 3 and 4 is as follows: Pay out From a position in which a hose cable or othe element is fully wound on the drum 53 the hose or etc. pulled upon to pay out and turns the drum 53 in the direction of arrow 81. Assuming that the latch 71 is in the dash lin position 71A shown in Fig. 3 the turning of the cam pla 61 will result in one of the levers 64' approaching th latch 71 to be in the extended position (shown to the right in Fig. 3) as a result of gravity centrifugal for or, if desired, spring bias and against the abutment 67 The lever 64' will then contact the pin 72 in the 72A position and will move the latch 71 from the dash line (71A) position to the full line position but immediately thereafter the latch 71 will contact the ramp surface 63 and be moved to the dash line (71A) position where it will be stably held by the over-the-centre mechanism. Thus, pay out occurs with the latch 71 cycling between the full line position and the dash line (71A) position. Reco l At any one instant the latch 71 will be in either the full line position or dash line (71A) position and if the latch 71 is in the latter position there is no impediment to recoil and the drum 53 will recoil in the direction of arrow 82 to wind in the hose or etc. when the hose is released. However, if the latch 71 is in the full line position recoil will not occur as the drum in turning in the direction of arrow 82 will cause the latch 71 to locate in ' one of the recesses 62 to prevent further recoi This situation should be easily and immediately discernibl by a user who need only pull upon the hose or etc. in the pay out direction (drum 53 rotation in the direction of arrow 81) until engagement of the latch 71 and one of the ramp surfaces 63 has moved the latch 71 to the dash line (71A) position whereafter recoil can occur. Latching If the latch 71 is in the full line position then the latch 71 will engage with one of the recesses 62 to prevent recoil . If the latch 71 is in the dash line (71A) positi recoil can occur and latching will not be had but this to will be immediately discernible and a user need only pull upon the hose or etc. in the pay out direction (drum 53 rotation in the direction of arrow 81) until engagement of the -latch 71 and one of the levers 64 causes the latch 71 to be put in the full line position whereafter, release of the hose or etc. will allow rotation of the drum 53 in the direction of the arrow 82 until the latch 71 engages one of the recesses 62 to prevent recoil. The construction described with respect to Figs. 3 to 4 allows recoil at any speed and undesired latching during recoil is unlikely to occur similarly as in respect of the Figs. 1 and 2 construction. Reference is also made to Figures 4-6 in which:- Figure 4 is a top perspective view of a reeling device in accordance with this invention, Figure 5 is a bottom perspective view of the reeling device of Figure 4, and Figure 6 is a partial cross-sectional view of th reeling device of Figure 4. The reeling device shown in Figures 4-6 may have either of the latching mechanisms described with respect to Figures 1 and 2 or Figures 3 and 4. The reeling device of Figures 4-6 comprises an outer casing 81, an inlet hose connector 82, a swivel 83 to which a hose can be connected, a drum 84 for holding hose, a spring 85 for biasing the drum 84 in a hose recoi direction and a handle 86 for tensioning the spring 85. Modifications and adaptations may be made to the above described without departing from the spirit and scope of this invention which includes every novel featur and combination of features disclosed ' herein.

Claims: CLAIMS 1. A reeling device including a reel for holding, paying out and winding in a linearly extendable, flexible member, means for biasing said reel in a direction of rotation for winding in said member and a latching mechani adapted to prevent winding in of said member and construct and arranged such that on paying out said latching mechani is sequentially and repetitively put into and out of condi to prevent winding in of said member. 2. A reeling device as claimed in claim 1, wherein there is a first means for putting the latching mechanism into said condition and a second means for putting the latch mechanism out of said condition. 3. A re.eling device as claimed in claim 2, wherein said first means and said second means are associated with thereof. 4. A reeling device as claimed in claim 2, wherein said first means and said second means are associated with a casing for the reel. 5. A reeling device as claimed in any preceding clai wherein the latching mechanism includes a ratchet wheel and a pawl . 6. A reeling device as claimed in claim 5, wherein the pawl is biased by an over-the-centre mechanism to be in a first or a second position in which it can and cannot engage with the ratchet wheel to prevent winding in of sai member. 7. A reeling device as claimed in claim 6, wherein the ratchet wheel has a ramp surface for moving the pawl from the first position to the second position and means is provided associated with the ratchet wheel but at an angularly rotated position for moving the pawl from the second position to the first position. OMPI λVIPO /?Λ-A lO≤ 8. A reeling device substantially as hereinbefore described with reference to the accompanying drawings. 9. The articles, things, parts, elements, steps, features, methods, processes, compounds and compositions referred to or indicated in the specification and/or clai of the application individually or collectively, and any and all combinations of any two or more of such.

Inventors: KING WILLIAM
Applicants: KING WILLIAM
Application year: 1981
Main classification: B65H75
IPC codes: B65H75