BACKGROUND OF THE INVENTION
[0001] The present invention relates to an improved safety hand-wheel.
[0002] In the industrial field are already known a plurality of mechanisms or devices for
opening and closing passages through ducts or pipes, for driving different types of
gates, for controlling safety valves and for changing the desired flow rates of any
types of fluids.
[0003] The above mentioned mechanisms can be either manually or automatically operated.
[0004] In an automatically operated mechanism, in particular, are also provided manually
operated emergency or safety means.
[0005] Actually, a manual driving device, both in a case in which it represents the sole
driving means, and in the case in which it replaces an emergency driving means, is
conventionally constituted by suitably contoured hand-wheels.
[0006] The above mentioned prior hand-wheels, however, are affected by the following disadvantages.
[0007] The gripping cannot be considered an anatomic gripping, i.e. the spokes included
in prior hand-wheels and the annular perimeter of said prior hand-wheels cannot be
easily used.
[0008] From the above mentioned problem several safety risks can occur, since a handling
difficulty can, in an emergency case, delay a necessary handling operation so as to
seriously damage systems and apparatus said prior hand-wheels are applied to.
[0009] A further drawback is that the mentioned prior hand-wheels require a lot of welding
operations with a consequent presence of a lot of welded regions.
[0010] As it should be apparent, the mentioned welding operations would involve a comparatively
high welding cost with further breakage consequences at the welded parts, mainly near
the contact surface subjected to the welding operations.
SUMMARY OF THE INVENTION
[0011] Accordingly, the main object of the present invention is to overcome the above mentioned
drawbacks affecting prior operating hand-wheels.
[0012] For achieving the above mentioned object, as well as yet other objects, which will
become more apparent hereinafter, the invention provides an improved safety hand-wheel
which can be made at low cost and can be easily and safely operated.
[0013] In particular, the subject hand-wheel is very reliable in operation and, accordingly,
it can be used in a lot of demanding applications.
[0014] Thus, according to the present invention, an improved safety hand-wheel has been
provided, comprising a contoured annular perimeter, and including a plurality of angularly
equispaced spokes, which have an anatomic shape, the overall hand-wheel being fully
made as a single piece.
[0015] The improved safety hand-wheel according to the invention is characterized by the
characterizing features disclosed in Claim 1.
[0016] The improved safety hand-wheel according to the invention provides the following
advantages.
[0017] Its gripping, due to its specifically designed configuration, is easy and safe.
[0018] Thus, the operator can be properly handle the hand-wheel under any operating conditions.
[0019] Moreover, the subject hand-wheel can be made by making methods which are much simpler
than prior similar hand-wheel making processes.
[0020] In fact, any welding operations, and the related problems, are fully eliminated.
[0021] The operating reliability and time duration of the subject hand-wheel, moreover,
are much greater than those of prior hand-wheels, and this mainly owing to the single-piece
construction of the inventive hand-wheel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Further characteristics, advantages and constructional details of the improved safety
hand-wheel according to the present invention will become more apparent hereinafter
from the following detailed disclosure thereof with reference to the accompanying
drawings, illustrating, by way of a merely indicative example, some preferred embodiments
of said hand-wheel.
[0023] In the drawings:
Figure 1 is a front view of the improved safety hand-wheel according to the invention;
Figure 2 is a rear view of the hand-wheel shown in Figure 1;
and
Figure 3 is a front view of a different embodiment of the hand-wheel according to
the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] With reference to the number references of the above mentioned figures, the improved
safety hand-wheel 1 according to the present invention is provided with an annular
perimeter 2, from which advantageously extends toward a central region 4 five spokes
3 which are angularly equispaced from one another.
[0025] The central region 4 defines moreover, at the geometrical center of the hand-wheel
1, a square cross-section inlet 5 for mounting said hand-wheel on a suitable driving
rod element, not specifically shown in the figures.
[0026] The spokes 3 connecting the annular perimeter 2 to the central region 4 defines five
openings 6, allowing the hand-wheel 1 to be easily gripped, independently from the
angular position of said hand-wheel.
[0027] More specifically, the spokes 3 and annular perimeter 2 are provided with a slightly
crowned outer surface.
[0028] Thus, each opening 6 will have a perimetrical anatomic contour which can be easily
gripped, owing to the provision of the mentioned crowned surfaces 7.
[0029] Advantageously, moreover, the overall hand-wheel 1 is made as a single piece, by
any suitable molding operation.
[0030] In a different embodiment, the hand-wheel 10 according to the present invention is
provided, on its annular perimeter 12, with a plurality of seats or recesses 11, which
are preferably arranged by sets or groups, at each said opening 16.
[0031] More specifically, the mentioned seats or recesses 11 define five sets or groups
of four equispaced elements, each seat 11 of each group being equispaced from the
other seats.
[0032] Such an arrangement will facilitate the gripping by the operator, as the hand-wheel
must be rotated.
[0033] It should be apparent that the configuration and size of the elements constituting
the improved safety hand-wheel according to the invention can be changed, depending
on requirements, without departing from the scope of the invention.
[0034] In operation, the hand-wheel 1, 10 is suitably connected to a driving shaft for operating
any mechanisms to be applied to several different systems to be operated under safety
conditions, the specific anatomic configuration of the hand-wheel and the strength
deriving from its integral construction providing said hand-wheel with very good reliability
and safety properties.
1. An improved safety hand-wheel, characterized in that said hand-wheel is made as a
single piece and comprises an annular contoured perimeter (2, 12), and a plurality
of angularly equispaced spokes (3), having an anatomic configuration.
2. An improved safety hand-wheel, according to Claim 1, characterized in that said single
piece forming said hand-wheel (1, 10) is a molded single piece.
3. An improved safety hand-wheel, according to the preceding claims, characterized in
that said hand-wheel (1, 10) comprises a plurality of anatomic spokes (3) radially
extending from said annular perimeter (2, 12) toward a central region (4), thereby
providing a plurality of openings (6, 16).
4. An improved safety hand-wheel, according to one or more of the preceding claims, characterized
in that said central region (4) comprises an inlet (5), of square cross section, arranged
at the geometric center of said hand-wheel (1).
5. An improved safety hand-wheel, according to one or more of the preceding claims, characterized
in that said spokes (3) and annular perimeter (2, 12) provides several crowned and
anatomic surfaces (7), each of which perimetrically delimits each said opening (6,
16).
6. An improved safety hand-wheel, according to one or more of the preceding claims, characterized
in that said annular perimeter (12) of said hand-wheel (10) defines a plurality of
seats (11) arranged at each said opening (16).
7. An improved safety hand-wheel, according to one or more of the preceding claims, characterized
in that said seats (11) define five sets of four equispaced elements, each said seat
(11) of each said set being equispaced from the other seats.
8. An improved safety hand-wheel, characterized in that said hand-wheel comprises a plurality
of specifically contoured, arranged and associated elements, and as broadly disclosed
and illustrated and for the intended objects.