Closure fasteners – Bolts – Sliding
Patent
1989-05-25
1992-06-09
Moore, Richard E.
Closure fasteners
Bolts
Sliding
292337, E05C 106
Patent
active
051200953
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is a safety lock comprising at least one sliding bolt attached to a bolt tail.
The aim of the invention is to provide a safety lock particularly resistant to house-breaking and on the other hand enabling the length and the dimensions of the bolts to be adapted without dismantling the whole lock.
For this purpose the safety lock in accordance with the invention is characterized in that the bolt tail includes a tubular frame, the locking mechanism being fixed inside the tubular frame.
The lock may include one sliding bolt or a plurality of sliding bolts removably fixed onto the bolt tail.
The bolt tail may include a longitudinal strengthening member fixed inside the tubular frame at the point of attachment of the bolts to the bolt tail. It may equally well include transverse strengthening members fixed inside the tubular frame.
The sliding bolt may be attached to the bolt tail by being screwed onto it.
The sliding bolt may include a first portion including attachment members intended for cooperating with attachment members on the bolt tail for attachment of the bolt to the bolt tail, and at least one second portion separarable from the first, the second portion being arranged around the first.
In accordance with one embodiment the sliding bolt comprises an inner portion in the form of a cylindrical rod having a male thread extending from one end of it over at least part of its length and screwed into a hole having a corresponding female thread in the bolt tail, the other end of the rod having a head portion of larger diameter than the diameter of the rod and forming a shoulder projecting outwards with respect to the axis of the rod, and an outer portion separable from the inner portion, in the form of a tube open at both ends and of inner diameter substantially larger than the outer diameter of the rod and having at one end of it a seat of dimensions substantially greater than those of the head portion of the inner portion and intended for seating the said head portion and forming a shoulder projecting inwards with respect to the axis of the tube, the shoulder on the head portion bearing against the shoulder of the seat in the outer portion. The outer portion of the bolt may be realized from hardened steel.
The lock may include a kepper equipped at the base of it with tenons intended for being fixed into the wall in a position inclined with respect to the central plane of the keeper in the direction opposite to the angle of rotation in opening the door.
As will become evident from the description which is to follow, the safety lock in accordance with the invention is not only very resistant to house-breaking but offers the advantage of being very easy to fit.
Other advantages and favourable characteristics of the safety lock in accordance with the invention will become more clearly evident from the description of an embodiment given below by way of example by referring to the attached drawing in which:
FIG. 1 represents a perspective of an embodiment of the portion of a safety lock including four sliding bolts attached to one bolt tail, and
FIG. 2 is a vertical section along I--I in FIG. 1.
As represented in FIGS. 1 and 2, the safety lock includes four sliding bolts 1 attached to one bolt tail 2. The bolt tail is obtained by means of a tubular profiled section 3 of generally rectangular outer shape and of rectangular section. A vertical strengthening bar 13 is fixed inside the tubular profiled section by means, for example, of a screw 17, along one of its short sides 14. The strengthening bar may of course also be fixed to the tubular profiled section by spot welds or by gluing.
The tubular profiled section also includes two square tubes 18, 18' for transverse strengthening, fixed inside the tubular profiled section at each end of it. The presence of these strengthening members has the aim of pushing back the point of pivot of the whole in case of house-breaking and consequently of increasing the resistance to the house-breaking.
Four holes 6 distributed along the short si
REFERENCES:
patent: 874830 (1907-12-01), Carroll
patent: 972769 (1910-10-01), Lark
patent: 1280993 (1918-10-01), Hammer
patent: 1654221 (1927-12-01), Kline
patent: 1762499 (1930-06-01), Baume 292172
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