Abstract
A cover (1) for manholes or traps is described, equipped with a mechanism for lifting and horizontally translating the cover (1), the mechanism being actuated through actuating means (10, 11, 12), and being adapted to automatically lift and afterwards horizontally translate or rotate the cover (1) to which it is operatively connected in order to completely open the manhole or trap.
Claims
1. A mechanism for lifting and moving a cover for a manhole or trap, wherein the manhole or trap is equipped with a mechanism for lifting and moving the cover in order to completely open the manhole or trap, wherein the mechanism is composed of a mobile frame for supporting the cover, the mobile frame fastened onto telescopic guides having a retracted position and an extended position, the telescopic guides are fastened to a mobile lifting frame equipped with wheels and a rack, the mobile lifting frame connected through the rack to a gear with toothed wheels of a fixed part, the gear with toothed wheels driven by a driving screw, and wherein actuation of the driving screw by a handle that is inserted into the driving screw causes the cover to lift.
2. The cover of claim 1, wherein the telescopic guides are equipped with an opening and closing stopper.
3. The cover of claim 1, wherein the telescopic guides are equipped with an opening and closing stopper.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The present invention will be better described by some preferred embodiments thereof, given as a non-limiting example, with reference to the enclosed drawings, in which:
(2) FIGS. 1 to 6 show a first preferred embodiment of the mechanism of the present invention;
(3) FIGS. 7 to 11 show a second preferred embodiment of the mechanism of the present invention;
(4) FIGS. 12 and 13 show a third preferred embodiment of the mechanism of the present invention; and
(5) FIGS. 14 to 16B show a fourth preferred embodiment of the mechanism of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
(6) It will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) could be made to what is described, without departing from the scope of the invention as appears from the enclosed claims.
(7) The operation of the mechanism is shown in FIGS. 1, 4, 7 and 10: the cover in its rest position (A) is composed of two parts: the actual cover (1), mobile and coated with the same material of the surrounding pavement, and a small, fixed cover (2a), where the terminal part of the driving arrangement is housed: by means of a handle (10) (B), by acting on a worm screw, the mechanism is actuated and lifts the cover over the walking height (C). Now, telescopic guides allow the horizontal translation of the cover (D), leaving the trap hole adapted to be accessed. p According to a first preferred embodiment of the invention, shown in FIGS. 2 to 6, the mechanism is shown in its composing parts: it is composed of a filling cover (1) made of suitable material and sizes (plate made of zinc-coated steel, PVC, stainless steel, etc.) to contain the following conglomerate casting and the related metallic framework, to be performed in a yard. Under rest conditions, the cover abuts onto a fixed frame (6); when it is lifted, the mechanism engages the cover (1) which, due to its prismatic shape (FIG. 4), remains blocked in the mechanism whose movements it is constrained to follow. The cover-holding frame (2) in turn is fastened to two telescopic guides (3) having a complete extraction, fastened to a mobile lifting frame (4) which slides, through wheels (4a), onto a fixed guide (5b). The lifting movement occurs by means of a rack (4b) driven by a toothed wheel (5c) connected to a gear (5e) which originates in a driving trap (5a), which is for example a revolving type screw, which is driven by the external handle (10).
(8) Summarizing, the mechanism is composed of a fixed part, (5)+(6), which is completely hidden, and of a mobile part, (2)+(3)+(4), which supports the actual cover. The small, fixed driving trap (5a) can be equipped with a lock, in its small cover (2a) or, through a suitable worked nut (driven by a special wrench), directly in the head 5d of the revolving screw.
(9) FIGS. 4A-C instead show, in the plan and sectional views, the mechanism in its three operating steps: closed (FIG. 4A), lifting (FIG. 4B) and translation (FIG. 4C).
(10) FIG. 5 is an axonometric bottom view pointing out the translating-elevating mechanism.
(11) FIG. 6 shows a variation, always object of the present invention, where, in place of the small driving trap (5a), there is a prismatic turret (2b), adapted to contain therein an electro-mechanical motor (2c) for controlling the mechanism, namely to work as external terminal of mains services possibly running below the trap: electric energy, water, gas, compressed air, light, etc.
(12) Preferably, the telescopic guides (3) are equipped with an opening and closing stopper 3a.
(13) According to a second preferred embodiment of the invention, shown in FIGS. 7 to 11, the cover (1) is equipped with a mechanism composed of a frame (2) for supporting the mobile cover (1) fastened onto telescopic guides (3) having a complete extraction, in turn fastened to a mobile lifting frame (4), equipped with wheels (4a), connected through a cross member (4b) to an hydraulic jack (5a) placed inside a fixed frame (5) whose actuation, by means of an external hydraulic pump (10), lifts the mobile cover (1).
(14) According to a third preferred embodiment of the invention, shown in FIGS. 12 and 13, the cover is equipped with a mechanism composed of a frame (2) for supporting the mobile cover (1) fastened to a ring (3) capable of performing a complete rotation around a vertical axis, in turn fastened to a mobile lifting concentric ring (4), equipped with sliding trolleys (4a), containing an hydraulic piston (5) having its cylinder oriented towards the cover (5a) and its piston oriented towards the support integral with the fixed frame (5b), whose actuation, by means of an external hydraulic pump (10), lifts the mobile cover (1).
(15) According to a fourth, preferred embodiment of the invention, shown in FIGS. 14 to 16, the frame (2) for supporting the mobile cover (1) is fastened to a ring (32) capable of performing a complete rotation around the vertical axis, and integral, by means of a pair of ball bearings (34) with axial resistance, with a screw (30), whose rotation, controlled by an external handle, inside a threaded sleeve (36) integral with the fixed frame (6), lifts the mobile cover (1) and, when closing, through the recess (38), pressure-closes the cover (1) onto the frame (6).
