RU2344237C1 - Hatch lid locking mechanism - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention deals with the inspection pits, hatches and other facilities for underground pipeline, water supply networks and sewage pipeline inspection and maintenance. Particularly, the invention relates to mechanisms preventing access of unauthorised persons into inspection pits. The mechanism is intended for lid locking and includes mechanism housing with collar where lid is installed. In the centre of the mechanism, there is a lock screw with head matched for the special wrench and sliding nut, which is connected cinematically with locking levers. The specific feature of this mechanism is no less than three brackets, which are rigidly connected with sliding nut and diverged in radial direction from the above nut. The holders are fixed to brackets ends. There is a locking lever installed axially in the groove of each holder. When lid is closed, the bottom end of the lever is coupled with the housing collar, whereas the upper end rests against the lid. The whole mechanism is suspended on the lock screw with tapered head being placed into the tapered opening in the lid. Nut restrainer is fixed to the lock screw from the opposite side. The restrainer is represented with screw head fixed to the end of lock screw. The locking lever and holder are connected with each other by means of spring turning the lever around axis and pressing the upper lever end to the hatch lid. Thus, the proposed mechanism may be widely used for locking off-the-shelf hatch lids in water supply and sewage pipeline inspection pits.

EFFECT: simplifying locking mechanism design to a substantial extent and reducing metal consumption during production together with overall dimensions; mechanism operation without substantial modernisation of standard hatch lid.

2 cl, 2 dwg

Description

The invention relates to manholes, hatches and other devices for examining and servicing underground utilities, water supply and sewage networks, and more particularly, to devices that prevent unauthorized persons from entering manholes.

A device for locking the hatch, containing located in the center of the lid locking screw with a turnkey head and a driving nut kinematically connected with locking levers [1]. The device includes a disk attached to the manhole cover, on which racks are installed. A crossarm is mounted on the racks, bearing the axis of the locking levers. The running nut is pivotally connected to the levers by means of a rocker arm and rods.

The disadvantages of the device are its high complexity, high metal consumption and the need for a significant modernization of the manhole cover.

A device for locking the manhole cover, comprising a housing with a shoulder, comprising a locking screw located in the center of the cover with a head for a special key and a driving nut kinematically connected with locking levers [2]. The device includes a disk attached to the manhole cover, on which a sleeve and three brackets with locking levers are installed. A rotary screw is located in the sleeve. The screw head is located in the socket attached to the manhole cover. Each locking lever is connected to the nut by a hinge.

The disadvantages of the device include its high complexity and high metal consumption. The significant dimensions and weight of the device make it difficult to open and close the lid. In addition, to install the locking device on a standard manhole cover, the latter must be substantially modernized: in addition to the central hole for the socket, holes for the bolts for securing the disk and socket must be drilled.

The proposed constructive solution is aimed at simplifying and reducing the metal consumption of the locking device. In addition, the task of reducing the modernization of the hatch cover of a standard design is being solved.

The device is designed to lock the hatch, including a housing with a shoulder on which the lid is based. The device contains a locking screw located in the center of the cover with a head for a special key and a driving nut. The latter is kinematically connected with locking levers.

A distinctive feature of the device is that it is equipped with at least three brackets that are rigidly connected to the running nut and radially diverging from it. Holders are attached to the ends of the brackets. In the groove of each holder on the axis, a locking lever is installed. The lower end of the lever in the locked state of the cover is hooked to the shoulder of the housing, and the upper end abuts against the cover. The whole device is suspended on a locking screw, the conical head of which is placed in the conical hole of the cover. On the opposite side of the locking screw, a nut travel stop is attached to it. The limiter is made in the form of a head (cap) screw, mounted on the end of the locking screw.

The locking lever and the holder are interconnected by a spring, deploying the lever around the axis and pressing its upper end to the hatch.

Figure 1 shows the device in a section in a locked state, and in figure 2 - in an unlocked (open) state.

The device is installed on the lid 1 of the hatch, including the housing 2 with a collar 3. The device comprises a locking screw 4 and a spindle nut 5 located in the center of the lid 1 (Fig. 1).

Brackets 6 are attached to the running nut 5 in an amount of at least three. The holders are fixed at their ends 7. A locking lever 9 is installed in the groove of each holder 7 on the axis 8. The lower end of the lever 9 in the locked state of the cover is hooked to the shoulder 3, and the upper end abuts against the cover 1. The whole device is suspended on the locking screw 4, conical the head of which is placed in the conical hole of the cover 1. From the side opposite the head, a screw 10 with a head restricting the stroke of the nut 5 is screwed into the central hole of the locking screw 4.

The locking lever 9 and the holder 7 are interconnected by a tension spring 11. One end of the spring is hooked to a finger 12 attached to the holder 7. The other end of the spring 11 is hooked to the eye 13 of the lever 9. The spring 11 rotates the lever around axis 8 and presses its upper end to cover 1.

The device operates as follows.

When you open the cover 1, the locking device is in the unlocked state (figure 2). In this case, the nut 5 occupies the lower part of the screw 4. Together with the nut down (relative to the cover), the brackets 6, the holders 7 and the axis of the levers 8 are displaced. Under the action of the spring 11, the lower end of each lever 9 is disengaged from the shoulder 3.

Locking the device is performed by rotating the screw 4. In this case, the nut 5, and with it the axis 8 of the levers 9 rise up (figure 1). The upper end of each lever 9 rests on the cover 1. The lever 9 is deployed and its lower end is brought under the ledge 3 of the housing.

The proposed technical solution can significantly simplify the design of the locking device, to reduce its metal consumption and dimensions. Unlike analogues, the device does not require significant modernization of the cover of a standard hatch. To install the locking device, drill one hole in the center of the manhole cover. Therefore, the proposed device can be widely used to lock the covers of serial hatches of the inspection wells of water supply and sewage networks.

BIBLIOGRAPHY

1. RF patent No. 2265698. Published 2005.12.10. IPC: E02D 29/12.

2. RF patent No. 2188291. Published 2002.08.27. IPC: E02D 29/12.

Claims (2)

1. A device for locking the manhole cover, comprising a housing with a shoulder, comprising a locking screw located in the center of the cover with a special key head and a driving nut kinematically connected with locking levers, characterized in that the device is provided with radially tightly connected to the running nut and diverging from it with at least three brackets with holders fixed at their ends, in the groove of each of which there is a locking lever on the axis, the lower end of which in the locked state of the cover is hooked to the shoulder of the housing, and the top the other end abuts against the cover, and the entire device is suspended on a locking screw, the conical head of which is placed in the conical hole of the cover, and a nut travel stop is fixed on the opposite side of the screw. 2. The device according to claim 1, characterized in that each locking lever and holder are interconnected by a spring, deploying the lever around the axis and pressing its upper end to the manhole cover.

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