FI107069B - Trapdoor - Google Patents

Abstract

The cover (6) is surrounded by a supporting frame (4) with guide rails (8) along two opposite side walls. The cover has upper (58) and lower (56) lugs on each side to engage with the guide rails, mounted on supporting legs (52) extending from the cover's lower surface and perpendicular to it. Each leg has a flat section (59) which prevents any pivoting of the cover as it is raised or closed. Each guide rail has a rear section (28C) which frees the cover, while each of the frame's opposite side walls has a locking rib (36) which is situated at least partially above the upper lug forming a chicane for the lugs to pass through.

Description

107069

The decrease hatch

The present invention relates in particular to a landing hatch for a technical arrangement related to water mail, comprising a support frame defining the passage and a removable closure cover.

It is often necessary to provide passageways on the ground, such as the driveway, that allow access for technical arrangements.

These technical arrangements can be used, for example, in pump or sewer wells, or in mounted box frames, where valves or water intakes for fire brigades are to be installed, or in street cleaning.

Such access hatches generally comprise a frame whose walls define the passage, these walls being provided at their upper end with a support rail, in which the edges of the cover are in contact with the support in the closed position. A hole is usually made in the Kan-15 for inserting the grip member for pulling the lid.

Once this member is in place, the lid can be pulled out by lifting and possibly positioning it along the circumferential bar to place it on its flat surface above the frame.

From GB-A-318 012 there is also known a landing door comprising a support frame and a removable closure cover. Each side of the frame has a guide rail, and each side of the cover has a guide rail, which slides on the top surface of the rail when the lid is opened by sliding movement towards the front and when the cover is closed by: * · · 25 towards dissolving.

♦ · »· ···· There are certain drawbacks to such devices.

: * · * In practice, the lid may be lost after it is pulled out or it may become damaged

• · I

: Pulled out of the frame in a bad way.

In addition, if the perimeter of the support frame is not symmetrical, it is difficult to: T: 30 aa determine the correct position of the cover over it when repositioning the cover.

In some cases, indexing of the cover in the frame may be done. · · · (Mandatory by using elements inside the landing door that are positioned so that they can affect the position of the deck when it is in position 35).

2 107069

It is an object of the invention to remedy these drawbacks by providing a landing hatch whose removable cover can be opened, although it works in practice with the support frame.

The objects of the invention are achieved by a landing gate according to independent claim 15. Preferred embodiments of the invention are described in the dependent claims.

For this purpose, the invention relates to a landing hatch of the type described, the frame of which includes a guide rail on each side surface, the cover comprising 10 legs running on each side on two guide rails, the upper leg sliding on at least partially against the underside when the lid is raised to the open position.

According to some specific embodiments, the invention may include one or more of the following features: - the footrests are formed on support legs located below the lower surface of the cover and extending perpendicular thereto relative to each side; each guide rail comprises a rear end for releasing the cover 20, each side wall comprising a rear closure strip positioned at least partially above the upper leg with the upper leg on one side of the cover release head, this release end and closure limiting the fairway plate for the cover legs; - the shape of the closing strip is oblong and inclined downwards and forwards: · ·; 25 in the direction of said release head; ··· * - the cover comprises a front locking catch for locking the frame with respect to the hinge, with the latch tongue set to cooperate with the retaining surface formed on the wall of the frame; - each guide rail having a rectangular front portion: Y: 30 parallel to the plane of the lid in closed position and a rear portion inclined downward and rearward of this rectilinear front and extending to the release end of the lid; - with the shoes positioned at least partially on one side of the lid release head with the lid in the closed position; 35 - each of the guide rails comprising a support surface of the lid with the lid 't in the closed position; 107069 - a cover comprising an inclined bearing surface on each side edge of its lower surface, which is arranged to cooperate with the upper surface of the inclined portion of the guide rail forming the support surface; - with each upper leg set at a distance from the top surface of the canopy less than the sum of the maximum deck thickness and the distance between the upper part of the front rail and the ground surrounding the support frame, the lower leg the distance between the lower surface and the ground being greater than the calculated sum of tea, whereby the lid may be placed on this surface in its maximum opening position; - the cover comprising curved release surfaces in the part in front of its lower surface; - with the shoes positioned near the rear end of the lid in its opening direction 15; - with the lid and support frame molded in one piece.

The invention further relates to a frame and a cover for such a landing door.

The invention may be more readily understood by reference to the accompanying description 20, which is given by way of example only, and with reference to the accompanying drawings, in which: Figure 1 is a bottom elevational view of a landing plate according to the invention; ; | Figure 2 is a sectional view taken along line II-II of Figure 1 with the lid ···· 'in the closed position; Fig. 3 is a sectional view taken along the line III-III in Fig. 2; Fig. 4 is a sectional view taken along the line II-II in Fig. 1 with the lid 30 in the open position.

The manhole 2 shown in the drawings comprises a fire valve access tray. It includes a support frame 4 and a closure cover 6.

... The support frame 4, made in one piece by casting, comprises *; two side walls 8, 10, which are almost vertical and parallel and located in the longitudinal center plane P. These side walls 8,10 are connected to one another by two walls 12, 14 which run almost vertically, each other • · · * ♦ 107069 4 and perpendicular to plane P, restricting the passage 16. These walls 12 and 14 respectively form the front and rear walls in the opening direction F1 shown in Figs.

The height of the walls 8-14 is determined by the operation of the manhole 5, whereby these walls can be dimensioned to protect a mechanical member, for example a valve designated by reference numeral K, as shown schematically in Figure 2.

As also shown in Figures 2-4, the lower part of the walls 8-14 is extended by an outwardly directed circumferential collar 18. This circumferential collar 18 comprises elongated closure openings 20 distributed over the entire circumference of the frame.

The reinforcement angle supports 22 connect the upper surface of the collar 18 to the side walls 8-14.

The lower surfaces of the walls 12, 14 within the passage 16, at their respective tops, respectively, contain support strips 24, 26 which extend over the entire length of each wall. The front strip 24 is extended in the sidewalls 8 and 10 via guide rails similar to the rails designated 28. The strip 24 likewise comprises two identical notches 24A at each end extended by guide rails 28.

These guide rails 28 have the same thickness as the bar 24. They thus comprise the first rectilinear front portion 28A of the bar 24, which extends parallel to the plane of the lid in the closed position and extends backward and downwardly inclined portion 28B. These inclined portions 28B terminate at a release end 28C at a distance from wall 14.

The rear trim 26 is also extended on each side wall 8 and 10 25 by means of similar short trim sections 32 which are extended by two identical trim strips.

a barrier shield 36 inclined downward and forward of the release heads 28C

• · • "direction, but ending a short distance from them.

The rear panel 26 further comprises two identical recesses 26A at each end, extending into the moldings 32. These recesses 26A are opposite the recesses 24 of the front panel 24.

The cover 6 shown in each figure comprises a single molded body, the outer periphery of which is connected by a small circumference to the bus 16. This. The cover includes a flat top surface 40 formed with anti-slip embossing patterns 42 and markings 44 which may, for example, indicate a landing door *. : 35 the nature of the elements below, etc.

5 107069

The lid 6 comprises a peripheral support surface 46 at its lower surface extending parallel to the upper surface 40.

The cover 6 comprises, on its side edges extending on the plane P, inclined support surfaces 48 near its rear end, supported by triangular strips 50 perpendicular to the level 5 of the cover cover 6. The inclined support surfaces 48 have the same inclination as the inclined portions 28B.

To one side of the triangular moldings 50, to the rear of them, are the support legs 52 formed at the rear of the cover and extending longitudinally, i.e. perpendicular to the plane P, on both sides of the cover 6 and below the circumferential leaning 46. These support legs 52 comprise reinforcing corner supports 54 on their inner surface, which are attached to the underside of the cover.

The support legs 52 comprise, at their outer surface, a lower support shoe 56 at their lower end and an upper sliding shoe 58 disposed at a distance from the support leg 56. Between the two Jalas, a flat and wide portion 59 is formed in the longitudinal direction 15, which is more than the height of the guide rails and approximately four times the length of the guide rails, sufficient to resist rotation of the lid when at least partially open.

The two sets of reinforcing strips, generally designated 60, form the projections 20 perpendicular to the lower surface of the lid 60. Certain longitudinal moldings include, at their foremost end, curved release surfaces 62 having a substantially circular quadrilateral curve profile with a considerable radius of curvature.

A lid retaining opening 64 is formed at this front of the lid.

Fig. 2 shows the lid in its closed position.

t ·

In this position, the support surface 46 of the cover rests against the upper surfaces of the support strips 24 and 26: **, as well as the upper surfaces of the rectilinear sections 28A of the guide rails, thus forming the support surfaces. Similarly, the inclined support surfaces 48 rest against the upper surfaces acting as support surfaces for the inclined portions 28B of the guide rails.

Thus, the lid 6, when in the closed position, is intended to withstand, for example, the heavy stresses caused by the passage of heavy vehicles.

In the closed position, viewed from the side (Fig. 2), the support legs 52 are, ·, placed on the release ends and shutter strips 36 of the guide rails 28. In more detail, the slide 58 on each side is positioned · · 35 to travel partly below the bottom end of the shutter strip 36 and partly above the release head • · 1 · t 6 107069 28C while the support leg 56 is again partially positioned below all these elements.

For the lid opening operation, the user of the device inserts a tool into the retaining opening 64 which allows him to disengage the end of the lid 6 provided with this opening of the support frame 4 until the reinforcing strips 60 surrounding the portions projecting from the valve K come above it. This removal of the front end of the cover 6 causes the support legs 56 to engage below the guide rails 28 as well as the Liu alley shoes 58 to engage above the top surface of the guide rails. After the removal of the cover 6 shown in Fig pulling direction of the arrow F1 direction of the two, already-ka 10 corresponds to the opening direction, allows the sliding movement of the lid 6 relative to the support frame 4. Thus, the sliding shoes 58 rest on the upper surfaces of the inclined portions 28B of the guide rails, causing the cover 6 to gradually rise with respect to the support frame 4. When the sliding shoes 58 reach the straight sections 28A of the guide rails, these slides continue to slide along the upper surface of these straight sections 15 until the cover 6 reaches the maximum opening position shown in Figure 4. In this maximum opening position, the front end of the support legs 52 is positioned in the recesses 24A formed in the strip 24, allowing for significant opening of the cover.

In the embodiment shown in these figures, the distance between the lower part 58 of the sliding foot 20 and the upper surface of the cover 6 is less than the sum of the maximum distance of the cover and the front rail and the surface of the driveway S surrounding the support frame. Further, the distance between the top of the support legs 56 and the top surface of the cover is greater than the sum of the maximum cover thickness and the distance between the lower surface of the guide rail machine and the surface of the driveway S surrounding the support frame.

Thus, the cover may be placed on its lap on the surface of the carriageway S as shown in Fig. 4 • · ·: 1. ·.

· It should be noted that when the support legs 56 are mounted under the guide: T: 30 beneath the rails 28, 30, it is impossible to retract the locking cap 6 of the support frame 4. In fact, if an attempt is made to lift the cover 6, the support legs 56 rest against the underside of the guide rails, preventing it. · ·. their introduction. Further, if an attempt is made to pivot the cover 6 about its vertical axis to remove the foot from the rails, the extended flat portions 59 of the support legs 52 will come into contact with the inner edges of the rails, completely obstructing rotational movement.

· 7 107069

Thus, once the opening of the landing door has been opened, it will be impossible to pull the closing lid off and thereby lose or steal it.

The closure cap to reclose it is only pushed again relative to the direction of arrow F1 in the opposite direction, for example parallel to the roadway surface 5 of the device by means of the user's foot.

As a result of this push, the sliding shoes 58 follow the shape of the upper surfaces of the guide rails 28 until the cover comes into the closed position shown in Figure 2. The rear end of the support legs 52 is then partially in the recesses 26A of the moldings 26.

During this closing step, the release surfaces 62 have a notable radius of curvature 10, which ensures that the driveway is undamaged as the cover slides on its surface and is easy to position the cover by easily positioning the release surfaces 62 over the frame edge and support bar 24. Finally, it is also ensured that the lid is closed to an inclined position sufficient to avoid contact between the moldings 60 and the upper parts of the valve K.

15 Removal of the removable cover 6 is made difficult for a person without experience and without suitable means due to the closing strip 36. In fact, if an attempt is made to lift the lid up while it is in the locking position, the sliding upper legs 58 will collide with the lower end of the inclined barrier strips 36, forming together with the guide rail release heads 28C 20 for barrier slides 56 and 58.

Withdrawing the cover 6 is necessary to raise the cover 6 by placing the appropriate tool for the retaining hole 64, and then removing the cover slightly in the direction of the arrow F1, and setting the second fitting after pidätystyö-, tool, such as a screwdriver, this arrest opposite the opening of the takatukipin-; - [25 nan 46 below 46. This second retaining tool allows the portion of the cover 6 near the feet to be lifted up.

'·· It is thus possible to cover both ends of a simultaneous upward f * * · the lifting means to remove the guide shoes 58 of the guide rails 28 inclined OSI i. * I 28B of the top surfaces and through the subsequent operation of the lid 30 relative to the transfer direction of the arrow F1 in the opposite direction, moving the sliding shoes 58 above the slats 36.

Continuation of raising of the cover 6 and the cover moved again in the direction of arrow F1 is therefore possible to remove the aid of runners 56 of the guide rails 'I' below the inclined portion 28B. The cover 6 can thus be completely pulled out of the support • «: 35 inches4.

»·

• I

•> · »t *« 8 107069

It is clear that removing the cover from the support frame is a very difficult operation because it requires the use of two tools and a series of steps that require good hardware knowledge.

For positioning the cover 6 on the support frame 4, it is sufficient 5 to engage the cover in its opening position below the lower legs 56 with the upper surface of the guide rails 28 and then push it in the opposite direction to arrow F1 until the cover comes in

It can be seen that the distance between the release head 28C and the lower end of the shutter strip 36 is adjusted to allow successive transit of the foot 56 and 58 with very little play following a defined, almost straight line of motion. In addition, due to the orientation of the shutter strip 36 and the inclined portions 28B, it is virtually impossible to pull the cover off by attempting to move the skids in accordance with this same trajectory but in the opposite direction. In practice, the weight of the lid and the lack of visibility make this operation quite awkward.

Thus, for the removal of the lid, it is necessary to use the method described above which comprises the lifting motion of the lid.

According to an embodiment not shown in the figures, it is possible to attach a locking catch below the retaining opening 64, the tongue of which is arranged to cooperate with the lower surface of the support bar 24 which forms the retaining surface.

Such a lock enables the cover 6 to be locked in position on the support frame 4, thereby making it impossible to open and pull the cover while the lock is closed.

· * »« · · «• · • • • I · • 4 |

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• «• •« · · «♦ * * * * ♦ * * • *

Claims (14)

A landing hatch, particularly for a technical arrangement related to fire hydrant, comprising a support frame (4) defining a passageway (16) and a removable closure cover (6) comprising a guide rail (28) on each of two parallel side walls (8, 10). characterized in that the cover (6) comprises two legs (56, 58) according to each of the lateral guide rails (28) comprising an upper leg (58) which slides over the top surface of the rail when the cover is opened by sliding movements towards the front; 6) closed by sliding movements towards the rear, and a lower base (56) adapted to abut against the underside of the rail when the cover (6) is raised at least partially to an opening position terminating at the release end (28C) of the rear cover (6) 8, 10) comprises a rear shutter bar (36), said release head and a shutter bar defining a shikan-15 type for passage slides (56,58) to allow removal of the cover. A landing door according to claim 1, characterized in that the closing strip (36) is located at least partially above the upper leg (58), which is on the other side of the lid release head (28C). A landing door according to claim 2, characterized in that the shuttering strip (36) has an elongated shape and is inclined downward and forward in the direction of the release head (28C). A landing hatch according to claim 1 or 2, characterized in that the slides (56, 58) are formed on the support legs (52) which extend below the underside of the cover (6) perpendicular to it and laterally to each other. 25 slacks to the side. ♦ »* '* I The landing hatch according to claim 4, characterized in that the support legs (52) comprise a flat part (59) opposite the guide rail (28), which • · | ka runs longitudinally to prevent the lid (6) from being pivoted. A landing hatch according to any one of the preceding claims, characterized in that the cover (6) comprises a lock cover (6) V at its front; for locking to the locking position with respect to the frame (4), the latch tongue of this lock is adapted to cooperate with the retaining surface (24) formed on one of the walls (4) of the frame (4). . ···. A landing hatch according to any one of claims 1 to 6, characterized in that each guide rail (28) comprises a rectilinear front * · · (28A) running in the plane of the closed position (6) and a rear 10 107069 (28B), which is inclined down and back from the rectangular portion (28A) to the release end of the lid (28C). A landing door according to any one of claims 1 to 7, characterized in that the slides (56, 58) extend at least partially to the other side of the lid release head (28C) when the lid is in the closed position. A landing door according to any one of the preceding claims, characterized in that each guide rail (28) comprises a support surface for the lid (6) in the closed position. 9 107069 A landing door according to any one of claims 7 to 9, characterized in that the cover (6) comprises a lower support surface (48) on both lower edges thereof, which is adapted to cooperate with the upper surface of the inclined portion (28B) of the guide rail. forms a support surface. A landing door according to any one of the preceding claims, characterized in that each upper leg (58) is set at a distance 15 from the top surface of the deck, this distance being less than the maximum deck thickness and the distance between the top surface of the front rail and the ground surrounding the support frame (4). and that the lower jaw (56) is disposed at a distance from the top surface of the cover (6) greater than the sum of the maximum thickness of the cover and the distance between the underside and ground of the guide rail (28) 20 so that the cover may lean against said surface. in the maximum opening position. A landing door according to claim 11, characterized in that the lid (6) comprises curved release surfaces (62) in the part in front of its lower surface. • ♦ A landing door according to any one of the preceding claims, characterized in that the slides (56, 58) are disposed near the rear end of the cover (6) according to its opening direction. A landing door according to any one of the preceding claims, characterized in that both the lid (6) and the support frame (4) are made in one piece by means of a molding. <· 11 107069