TENSIONING DEVICE
FIG20 is a perspective view of the pulley wheel of FIG11 
The drive spindle 28 connected to the pulley 14 includes a first shaft section 130 having a circular cross-sectional shape of a first diameter and a second shaft section 132 having a circular cross-sectional shape of a second diameter. The first diameter is larger than the second diameter. As shown in FIG20, the pulley wheel flanges 34 extend radially from the first shaft section 130. Furthermore, apertures 30 in the housing plates 20, 22 are sized to receive the first shaft section 130. In particular, a first end 134 of the drive spindle 28, at the end of the first shaft section 130, protrudes through an aperture 30 in the second, rear housing plate 22.
perspective view
20
plates plate
76
hole holes
90
insert
36
groove
68
arm
92
perimeter edge
136
drive shaft section
18
handle assembly
94
hole
78
second hole
70
base plate
72
second face
98
surface
88
aperture
82
post
28
spindle
130
first shaft section
86
boss
34
flanges
138
between opposite drive surfaces
132
second shaft section
['1. A tensioning device (10) for a horizontal lifeline comprising: a pulley (14) including a drive spindle (28) and a pulley wheel (14) connected to the drive spindle (28), said lifeline passing, in use, around the pulley wheel (14); a locking member (38) configured to engage, in use, with a part of said lifeline to prevent relative movement of the lifeline with respect to the locking member (38) in a first direction; and a handle assembly (18) connected to the drive spindle (28), the handle assembly (18) being moveable between a first, disengaged position in which rotation of the handle assembly (18) does not cause rotation of the drive spindle (28) and a second, engaged position in which rotation of the handle assembly (18) rotates the drive spindle (28), characterised in that : movement of the handle assembly (18) between the first and second positions is along an axis of the drive spindle (28), wherein the drive spindle (28) includes a drive shaft section (136) and in the first position the handle assembly (18) is engaged with the drive shaft section (136) and in the second position the handle assembly (18) is not engaged with the drive shaft section (136), and wherein rotation of the drive spindle (28) rotates the pulley (14) to move the lifeline in a second direction relative to the locking member (38), thereby tensioning the lifeline.', '7. A tensioning device as claimed in any one of Claims 3 to 6, wherein one of the coupling member (66) and the arm (68) includes a detent (82) and the other one of the coupling member (66) and the arm (68) includes a stop surface (120,122), the detent (82) contacting the stop surface (120,122) to limit relative movement between the arm (68) and the coupling member (66) and wherein the detent (82) contacts the stop surface (120,122) when the arm (68) is in the second position.', '11. A horizontal lifeline system as claimed in Claim 9 or Claim 10, wherein the pulley (14) is located between two housing plates (20,22) and the lifeline enters a space between the housing plates (20,22) at a first location and exits the space between the housing plates (20,22) at a second location, such that the lifeline is in contact with the pulley wheel (14) around at least half the circumferential length of the pulley wheel (14).']