Closure fasteners – Bolts – Multiple
Patent
1996-01-19
1997-11-18
Lindsey, Rodney M.
Closure fasteners
Bolts
Multiple
292 36, 292DIG64, E05C 916
Patent
active
056880006
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to shoot bolt mechanisms.
Such mechanisms are mounted on a moveable frame, particularly a window frame, and include at least one shoot bolt which is moveable by, for example, operation of a handle, from an inoperative position to an operative position in which the shoot bolt engages a fixed frame to lock the moveable frame to the fixed frame.
The mechanism may also include two further shoot bolts carried on the moveable frame at locations remote from the mechanism and moved by the mechanism, via shoot bolt rods between inoperative positions and operative positions in which they engage the fixed frame.
In windows, in particular, where the moveable frame may be formed by thin membranes, there is a requirement for a shoot bolt mechanism that is as compact as possible given the requirement for a fixed throw of the shoot bolt (i.e. the distance moved by the shoot bolt between the inoperative and operative positions).
SUMMARY OF THE INVENTION
According to the invention, there is provided a shoot bolt mechanism comprising a casing containing a shoot bolt slidable between an inoperative position and an operative position, a rotatable drive member mounted in the casing and a link pivotally connected at one end to the shoot bolt and at an end opposite said one end to a point on the boss eccentric from the axis of rotation thereof, said pivot axes being parallel to the axis of rotation of the drive member so that rotation of the drive member is translated by the link into movement of the shoot bolt between said retracted and extended positions.
Such a mechanism can be very compact.
The drive member may comprise a boss including a lug projecting therefrom, the lug including said pivotal connection with the link.
Preferably, the drive member includes an exterior surface of circular cross-section, the link including an inner edge having a curvature generally equal to the curvature of said circular cross-section, said inner edge embracing the exterior surface of the drive member when the shoot bolt is in the inoperative position.
Where the drive member includes an exterior surface of circular cross-section, the link may include an outer edge having a curvature generally equal to the curvature of said circular cross-section, the shoot bolt including an inner recess having a corresponding curvature so that, when the shoot bolt is in the inoperative position, the curved outer edge of the link is received in said recess.
When the shoot bolt is in the inoperative position, the axes of the pivotal connections of the link may lie on an imaginary arc having a centre on the axis of the drive member and subtending an angle of 90.degree. relative to the drive member axis.
When the shoot bolt is in the operative position, the axes of the pivotal connections of the link and the axis of the drive member may lie on an imaginary straight line extending in the same direction as the direction of movement of the shoot bolt.
In this case the drive member preferably rotates through 90.degree. to move said bolt between the inoperative and operative positions.
Preferably the shoot bolt is constrained by the casing to rectilinear movement between said inoperative and operative positions.
The mechanism may further comprise two drive transfer members disposed-on respective opposite sides of the shoot bolt, rotation of said drive member moving the drive transfer members between respective retracted and extended positions.
The shoot bolt may be linked to the two drive transfer members so that movement of said shoot bolt between the inoperative and operative positions causes movement of the drive transfer members between the retracted and extended positions and movement of the shoot bolt between the operative and inoperative positions causes movement of the drive transfer members between the extended and retracted positions.
The linkage between the shoot bolt and each drive transfer member may comprise a pin engaging in an angled slot so that movement of the pin in one direction produces a force
REFERENCES:
patent: 958880 (1910-05-01), Lawson
patent: 1621740 (1927-03-01), Pavola
patent: 1670277 (1928-05-01), Albach
patent: 1895630 (1933-01-01), Kemp
Feneseal Limited
Lindsey Rodney M.
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