JP2701143B2 - Hatch structure for snow throwing holes such as snow drifts and snowmelt tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hatch structure for a snow throwing opening such as a snow ditch and a snow melting tank, and in particular, to a snow ditch as an underground waterway provided under a road as a snow countermeasure facility in a snowy city.
A hatch structure for a snow opening, such as a snow ditch, a snowmelt tank, etc., that allows the operator to easily open and close the hatch plate at the snow opening to collect and throw snow on the roof or road surface. It is.

[0002]

2. Description of the Related Art As a conventional hatch structure for a snow throwing hole into a snow drift, a snowmelt tank, or the like, for example, a hatch plate with a gas spring hinged to the top of the snow throwing hole is manually opened and closed. A groove cover opening / closing device for a snow groove which facilitates the disclosed operation by providing an opening / closing operation mechanism for decelerating the rotation by an operation handle on a groove cover swingably attached to the opening of the snow groove (Japanese Patent Laid-Open No. Hei 3 -156,041).

Although not shown, the inventor of the present invention has provided a hatch frame having a rectangular hatch plate with a hatch plate disposed laterally on a rectangular frame at the top of a snow opening in a snow throwing area. By providing a balance weight shaft with an arm provided with a balance weight, which is geared with the hatch shaft below the hatch shaft, it is possible to easily open and close the hatch plate by hand, such as a snow plow. A mouth hatch structure has already been proposed (see Japanese Patent Application No. 6-226,117).

[0004]

However, in the rotary hatch structure with a gas spring provided on the top of the snow opening, the opening and closing operation force of the hatch plate is reduced, but the gas leak due to aging is used. It is necessary to take measures. In addition, in the snow cover groove opening / closing device described in JP-A-3-156041, the opening / closing operation of the groove cover is performed by decelerating the rotation of the operating handle by an operating mechanism. Although it is possible, the operation mechanism becomes complicated, and it is necessary to take measures to prevent freezing of the groove lid and the operation mechanism. Opening and closing operations still required some time.

Further, in the hatch structure for a snow throwing port such as a snow drift in Japanese Patent Application No. 6-226117 proposed by the present inventor, a rectangular frame at the top of the snow throwing port is provided. Although the hatch plate can be easily opened and closed manually by using a hatch shaft that is mounted on the hatch frame and a balance weight shaft that has an arm with a balance weight that cooperates with gears.
In this case, there is a possibility that the snow throwing on the balance weight that swings in the snow opening will collide with the snow, and the normal meshing state of the interlocking mechanism between the hatch shaft and the balance weight shaft will be maintained for a long time. There was a problem of incurring a considerable increase in cost for securing.

The present invention has been made in view of the problems which remain in the above-mentioned conventional example and the above-mentioned proposals of the present inventor, etc., and throws snow into a snow drift 3 provided in the basement of the snow throwing area 2, a snow melting tank, and the like. A pair of hatch shafts 2 provided at appropriate intervals in the center of the top of the mouth 5
The hatch plates 15 and 15 are provided at 0 and 20, and the balance weights 2 which are substantially balanced with the hatch plates 15 and 15 are provided at the extension portions 20A and 20A at one end of the hatch shafts 20 and 20.
By providing 5, 25, 45, and 45, there is no danger of complicating the configuration, increasing construction costs, maintenance costs, and other costs, and also allowing the hatch plates 15, 15 to be easily opened and closed manually. It is an object of the present invention to provide a hatch structure for a snow opening such as a snow melting tank.

[0007]

SUMMARY OF THE INVENTION The present invention has been made by focusing on the problems in the conventional example described above.
A pair of hatch shafts 20, 20 are provided laterally at an appropriate interval L at the center of a hatch frame 11 provided at the top of the snow opening 5 of the snow throwing area 2, and the hatch shafts 20, 20 have hatch openings. Attached to the lower part of one side of the hatch plates 15, 15 that divides the hatch shafts 20 substantially into two, and extended portions 20 A extending to the concave portions 9, 9 provided in the side walls 5 A of the snow opening 5 at opposite ends of the hatch shafts 20, 20. 20A is provided with balance weights 25, 25, 45, and 45 that substantially balance the hatch plates 15, 15, and front ends 25B of the balance weights 25, 25, 45, and 45 in the upright state of the hatch plates 15, 15.
25B, 45B, 45B and the front wall 9 of the recesses 9, 9
A hatch structure for a snow throwing hole such as a snow drift or a snowmelt tank in which the hatch plates 15 and 15 are prevented from being excessively opened by abutting with the B and 9B portions. Balance weights 25, 25, 45, 45 in the standing state
Of the front ends 25B, 25B, 45B, 45B of the recesses 9 and the front walls 9B, 9B of the recesses 9, 9 or the front plates 14B, 14B of the U-shaped side plates 14, 14 disposed in the recesses 9, 9. By contact, excessive opening of the hatch plates 15, 15 is regulated,
And a hatch opening 10 formed by the hatch plates 15, 15.
A means 13B, 13B, 17, 17 for securing the closed state of A is provided.

(Operation) Since the present invention has the above-described configuration, the snow cover on a roof or a road surface (not shown) is collected and carried to the snow throwing area 2, and the snow opening 5 of the snow throwing area 2 is provided. The hatch shafts 20, 20 are laterally provided on the top hatch frame 11, and the hatch plates 15, 1 of the hatch 10 fixed to the hatch shafts 20, 20.
5, one or both of the hatch plates 15, 15 are used to secure the closed state of the hatch opening 10A.
After releasing B and 13B, the hatch receiving plates 13A and 13A
Is manually pulled up and opened to throw snow.

Even if the falling snow hits the rear surfaces of the raised hatch plates 15, 15, the balance weights 25, 25, 45 fixed to the extension portions 20A, 20A at one end of the hatch shafts 20, 20 facing each other. , 45 front end 25
B, 25B, 45B, 45B are the side walls 5A of the snow opening 5,
5A, the front walls 9B, 9B of the concave portions 9, 9 or the front plates 14B, 1 of the U-shaped side plates 14, 14 disposed in the concave portions 9, 9.
4B, the hatch plates 15, 15 are prevented from being excessively opened, and the hatch plate 15, on which the snow throwing is caused to stand,
15 is guided to the snow throwing port 5 along the back surface and falls into the snow drift 3 or the like.

The hatch plate 1 that stands up after the snow is thrown into the snow opening 5.
When the hatch openings 10A are closed by pressing the ends of the hatches 5 and 15 manually, the closed state of the hatch openings 10A by the hatch plates 15 and 15 and thus the closed state of the snow opening 5 is changed to the hatch openings 10A. Means for securing the closed state 17, 17,
13A, automatically secured by 13A.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a hatch structure for a snow throwing port according to the present invention. FIG. 1 is a schematic perspective explanatory view of an embodiment of a hatch structure for a snow throwing port such as a snowfall groove according to the present invention, FIG. 2 is a schematic plan explanatory view thereof, and FIG. 3 is a schematic view taken along line AA of FIG. In the vertical cross-sectional illustration,
In FIG. 3, the upright state of the hatch plate 15 and the balance weight 20 on one side (right side) is schematically indicated by a dashed line. FIG. 4 is a diagram showing a bell crank shape provided at the lower end of the hatch plate 15 in the closed state of the opening 10A of the snow opening hatch 10 by the hatch plate 15 (right side in FIGS. 1 to 3) of the embodiment of the present invention. FIG. 5 is a schematic side view showing a hook 17 and a stop pin 13B around a hatch receiving plate 13, and FIG. 5 shows a hatch structure for a snow throwing port such as a snow drift groove according to the present invention. , 35 are schematic side views.

In the figure, 1 is a road surface, 2 is a snow throwing area,
This snow throwing area 2 is a high-level road surface 1 such as a snow drift 3 or a snow melting tank built under the city or a bridge on a river (not shown).
Usually, it is arranged at the corners or the like. 5 is snow area 2
The lower part of the snow opening 5 is connected to a snow drift 3 or a snow melting tank. Reference numeral 6 denotes a snow port frame provided on the top of the snow port 5 and having a substantially rectangular shape in plan view, 7 denotes an L-shaped frame plate, 7A and 7
B is a bottom plate and a concave portion of the L-shaped frame plate 7, and 8 and 8 are
The positioning plates 8, 8 are buried in the concrete or the paved road surface 1 around the top of the snow opening 5, with positioning spaces provided at appropriate intervals outside.

Reference numerals 9 and 9 denote recesses provided at the center of the left and right side walls 5A and 5A of the snow opening 5 in FIG. 1, 9A and 9A denote the side walls of the depressions 9 and 9, and 9B and 9B denote the front of the depressions 9 and 9. Walls (in FIG. 3, front walls that abut against end portions 25B of balance weights 25 described later), 9C and 9C are bottom wall portions of recesses 9 and 9 and 9D and 9D.
Is a top plate for closing the opening at the top of the concave portions 9, 9, 10 is a hatch, 10A is a hatch opening, 11 is a hatch frame having a substantially rectangular shape in plan view, and 11A and 11B are vertical hatches of the hatch frame 11. Side plates and horizontal top plates, 12 and 12 are cutouts formed in the center of top plates 11B and 11B of left and right (FIG. 1) hatch frames 11, and 13 and 13 are front and rear (left and right in FIG. 1) vertical side plates. Hatch receiving plates, 13A, 13A, which are welded to 11A, 11A at appropriate intervals M, are hatch receiving plates 13, 13,
The hatch receiving plate 13, with a nylon resin plate attached to the top of
13 and the lower surfaces of the hatch plates 15, 15 described below are prevented from freezing. 13B, 13B are locking pins projecting from the hatch receiving plate 13, and 14, 14 are left and right (up and down in FIG. 1) vertical side plates 1.
1A, a side plate in a U-shape in plan view welded to the outside of 11A,
The U-shaped side plates 14, 14 are formed to have substantially the same width as the recesses 9, 9, and the recesses 9, 9 are arranged such that front plate portions 14 B, 14 B are located on the front walls 9 B, 9 B side of the recesses 9, 9. 9.

The hatch plates 15 are provided with the hatch opening 1.
0A, that is, a size that halves the opening of the hatch frame 11 (therefore, the snow opening 5). Fifteen
B is an operation hole provided in the hatch plates 15 and 15;
5B is provided above the stop pin 13B when the hatch opening 10A is closed by the hatch plate 15. Reference numerals 16 and 16 denote nylon resin plates adhered to the lower surfaces of the hatch plates 15 and 15, respectively, to suppress dew condensation and freezing on the lower surfaces of the hatch plates 15 and 15. Note that hatch plate 1
If the nylon resin plates 16 and 16 are adhered to the back surfaces of 5 and 15, the attachment of the nylon resin plate 13A on the hatch receiving plate 13 can be omitted.

Reference numeral 17 denotes a bell crank-shaped hook. The base 17 A of the bell crank-shaped hook 17 has the operation hole 15.
In the state of FIG. 4 in which the shaft 18 is attached to the lower side of the front end of the hatch plate 15 so that the hatch plate 15 lays down horizontally and closes the hatch opening 10A, the bell crank-shaped hook 17 Due to the weight of the base portion 17A side, the bell crank-shaped hook 17 is rotated from the dashed line position to the solid line position in FIG. 4 so that the hook portion 17B and the stopper pin 13B are automatically engaged, and the hatch plate 15 The closed state of the opening 10A is ensured.

Although not shown, if a spring for constantly urging the bell crank-shaped hook 17 in the clockwise direction around the axis 18 in FIG. 4 is provided around the coaxial 18, the base 17A of the bell crank-shaped hook 17 can be reduced in weight. , Automatic engagement between the hook portion 17B and the stop pin 13B is ensured.

Reference numerals 20 and 20 denote a hatch shaft rotatably provided at a central portion of the vertical side plates 11A and 11A of the hatch frame 11 with an appropriate distance L therebetween.
0 and 20 are extensions extending to the recesses 9 and 9 at opposite ends, respectively. In the illustrated embodiment, the extensions 20A and 20
The leading end of A crosses the recesses 9, 9, and its ends are supported on both sides of the U-shaped side plates 14, 14. The extension 20
A, 20A are outer bearings on both sides of the U-shaped side plates 14, 14 and further extended to extend the vertical side plates 11 of the hatch frame 11.
It is also possible to adopt a configuration in which the bearings are simultaneously mounted by A and 11A.

Reference numerals 25, 25 denote balance weights having a substantially segment shape in a side view. The balance weights 25, 25 are fixed to the extended portions 20A, 20A of the hatch shafts 20, 20 so as to be substantially balanced with the hatch plates 15, 15. And
The position of the solid line in FIG.
15 to be horizontal and close the hatch opening 10A)
And the position of the dashed line (the hatch plates 15, 15 stand up to open the hatch opening 10A).
When the end 15 is raised, the end portions 25B, 25B of the front wall 9B, 9B of the recess 9 or the front plate 14 of the U-shaped side plate 14,
By contacting portions B and 14B (when the front plate 14B is formed over the entire height of the U-shaped recesses 9 and 9), excessive opening of the hatch plates 15 and 15 is restricted.

The means for regulating the degree of opening of the hatch plates 15, 15 include the ends 25 of the balance weights 25, 25.
B, 25B and the front walls 9B, 9B of the concave portions 9, 9 or the front plates 14B, 14B of the U-shaped side plates 14, 14, and the structure in which the front plates 14B, 14B are directly in contact with each other. It is also possible to adopt a configuration in which locking pins (not shown) that directly contact the ends 25B, 25B of the balance weights 25, 25 are provided.

In the above embodiment, the hatch plates 15, 1
In a state in which the lower surface of the end portion 5 (the left and right sides in FIGS. 1 and 2) is in contact with the upper surfaces of the hatch receiving plates 13 and 13 to close the opening 10A, the hatch plates 15 and 15 are substantially extended. The upper surfaces of the positioned balance weights 25 are raised so as to be parallel to the road surface 1 so that the tops of the concave portions 9 are substantially closed. However, in the embodiment of FIG. 1, even when the balance weights 25, 25 are in a substantially horizontal state, an opening is formed at the top of the recesses 9, which hits the base side of the balance weights 25, 25. Left recess 9 in FIG.
In this case, the top plate 9 is located in the remaining opening.
D, 9D (left side in the upper concave part 9 in FIG. 2, lower concave part 9 in FIG.
(Right side) is arranged in advance to close the opening.

Although not shown, the rear side walls of the recesses 9 are formed to be inclined forward so that the tops of the recesses 9 become narrower. In this state, if the recesses 9, 9 are formed around the base so that no openings remain on the tops of the recesses 9, 9D, the top plates 9D, 9D can be omitted. In the closed state of the hatch opening 10A by the hatch plates 15, 15, when the top surfaces of the balance weights 25, 25 are configured to be lower than the road surface 1 (not shown), the concave portions 9, 9 are formed. It is preferable that the entire area of the top is closed by the top plate (9D, 9D).

(Operation of Embodiment) First, a roof (not shown)
After collecting the snow on the road surface 1 and carrying it to the snow throwing area 2, the hatch plates 15, 15 are brought into contact with the hatch receiving plates 13, 13 while the hatch openings 10 </ b> A are closed.
The operation rod 32 is inserted from the operation holes 15B, 15B at the five ends to press the base 17A of the bell crank-shaped hook 17 and is rotated around the shaft 18 so that the engagement between the hook 17B and the stopper pins 13A, 13A is established. Release the locked state.

Next, while the locking portion 34 of the operating rod 32 is locked to the base 17A of the bell crank-shaped hook 17, the operating rod 32 is
The base 1 of the bell crank-shaped hook 17 is rotated by 0 °.
7A is disengaged, and the locking portion 34 is attached to the hatch plate 1.
When the operation rod 32 is pulled up by engaging the lower end of the operation hole 15B of the fifth operation hole 15B, the end of the hatch plate 15 via the base 17A of the bell-crank hook 17 or the hatch without the intervention of the base 17A. The end of the hatch plate 15 is pulled up by being engaged around the operation hole 15B of the plate 15, and the right hatch plate 15 is turned counterclockwise around the hatch axis 20 in FIG. 3 from the solid line position in FIG. θ (for example, 95 to 1
The hatch opening 10 </ b> A, that is, the top of the snow opening 5 is opened by turning and standing up, and the snow is thrown into the snow opening 5.

At this time, the balance weight 25 hangs down from the horizontal state (solid line) in FIG. 3 to the vertical state (dashed line) via the hatch shaft 20, and the end portion of the balance weight 25, which is substantially segment-shaped when viewed from the side. 25B abuts against the front wall (right side wall in FIG. 3) 9B of the recess 9 to prevent further rotation of the balance weight 25 in the counterclockwise direction (FIG. 3), and is fixed to the hatch shaft 20. Opening of the hatch plate 15 counterclockwise from the state shown in FIG. 3 is restricted. Accordingly, the right side of the rear surface of the hatch plate 15 that stands up (FIG. 3)
, The hatch plate 15 does not rotate any more in the counterclockwise direction (clockwise for the left hatch plate 15 in the figure), and the back surface of the hatch plate 15 (right side in FIG. 3). Along the path to the snow opening 5.

After the snow is thrown into the opening 10A, that is, the snow opening 5, the hatch plate 15 is lightly pushed by hand or from the back side of the hatch plate 15 with the operation rod 32, so that the hatch plate 15 rotates around the hatch shafts 20, 20. When the lower end of the hatch plate 15 approaches the upper surface of the hatch receiving plate 13 while rotating in a clockwise direction (FIG. 3) while maintaining the balance, the bell crank attached to the shaft 18 below the lower end of the hatch plate 15. The bell-crank hook 17 is rotated clockwise about the axis 18 so that the inclined surface on the back of the hook portion 17B of the hook 17 engages above the locking pin 13B and retracts the hook portion 13B from the locking pin 13B. (FIG. 1), and the hook portion 17B is turned to the stop pin 13B.
Descent over. After that, bell crank shaped hook 1
7 rotates counterclockwise (FIG. 1) around the shaft 18 due to the weight of the base 17A, so that the hook 17B advances below the stop pin 13B, and the upper side of the hook 17B is the stop pin 13B. The lower side is engaged, and the closed state of the hatch opening 10A by the hatch plates 15, 15 is automatically secured. At this time, the balance weight 25 returns to a substantially horizontal state at the position indicated by the solid line in FIG. 3, and the top of the recess 9 is closed.

Assuming that the hatch shafts 20, 20 and the hatch receiving plate 1
In the case where the distance from the end of each of the openings 3 and 13 is wide, the hatch shaft 20 of the opening 10A is prevented in order to prevent a worker or the like from inadvertently falling from the opening 10A.
For example, a horizontal bar, a rough screen, or the like is horizontally provided between the hatch receiving plates 13 and 13. Note that these horizontal bars or rough screens are in a closed state so as not to hinder the snow from being thrown into the snow hole 5 and to prevent the hatch plate 15 from hindering the opening 10A. Are disposed slightly lower than the lower surfaces of the hatch plates 15, 15.

As the structure of the hatch plate 15 in the hatch structure for a snow throwing port such as a snow drift groove according to the present invention, a large number of water-permeable slits can be provided in the hatch plate, not shown, although not shown in the above embodiment. In addition, an appropriate symbol, marker, or the like may be displayed on the hatch plate, but in any case, the operation is substantially the same as that of the embodiment.

(Modification of Balance Weight) FIG. 5 is a schematic side view of a modification of the balance weight in a hatch structure for a snow throwing port such as a snow drift or a snow melting tank according to the present invention. In FIG. 5, 45 is a balance weight that is substantially L-shaped when viewed from the side (however, the lower part is an arc shape), 45 A is an arc portion of the balance weight 45, 45 B is an end portion of the arc portion 45 A, and the balance weight 45 is By inserting the extension 20A of the hatch shaft 20 into the hole 46 at the top and fixing the same, the balance weight 45 and the hatch plate 15 are fixed.
Are substantially balanced around the hatch shaft 20.

The balance weight 45 has a hole 46 at its top.
One side from the lower end between the charge and separation (right side in FIG. 3)
Since the arcuate portion 45A is extended to the hatch plate 20, the hole 46 is attached to the extension 20A of the hatch shaft 20 so as to face the hatch plate 15, and the hole 46 is fixed to the hatch shaft 20. 15 can be made lighter than the balance weight 25 of the embodiment shown in FIGS. The remaining configuration and operation, including fixing the balance weights 45 to the extended portions 20A of the hatch shafts 20, 20, are substantially the same as those of the above embodiment.

[0030]

Since the present invention has the above-described structure and operates, the following effects can be obtained.

(1) The balance weights 25, 25, which are substantially balanced with the hatch plates 15, 15, are provided on the extension portions 20A, 20A at the opposite ends of the hatch shafts 20, 20 to which the lower sides of the hatch plates 15, 15 are fixed. , 45, 45, the hatch plates 15, 15 can be easily and easily opened and closed by so-called weak persons such as children and elderly persons. Moreover, as in the conventional example, the gas pressure of the gas spring is secured, and There is no need to take troublesome maintenance measures such as securing a good meshing state for a long period of time.

(2) Since means for securing the closed state of the hatch opening 11B by the hatch plate 15 is provided between the hatch plate 15 and the hatch receiving plate 13, this snow throwing hatch is temporarily attached by running a vehicle or the like. Even if a slight vibration is generated in the structure, the hatch plates 15, 15 are inadvertently swung and the
There is no danger of opening the hatch, and after releasing the closed state securing means as needed, the hatch plates 15, 15 can be manually operated to easily open the hatch opening 10A and throw snow.

(3) The hatch plates 15, 15 and the balance weights 25, 25, 45, 45 are connected to the hatch shafts 20, 20.
In order to secure the strength of the snow hatch 10, the hatch 10 can be easily opened and closed by hand even if the weight is slightly increased, so that the snow hatch 10 can be easily secured. The material selection range of the entire snow hatch 10 is widened. For example, the hatch 10 is excellent in corrosion resistance and durability, has sufficient strength, and has various patterns 15C,
In addition to facilitating the selection of materials capable of displaying symbols and the like, the hatch plates 15 and 15 can be made of a cast iron material or the like that can be easily designed in various ways. Hatch structure for a snow opening.

(4) The hatch plates 15, 15 and the balance weights 25, 25, 45, 45 are connected to the hatch shafts 20, 20.
By providing means 17, 17, 13 </ b> B, 13 </ b> B between the hatch plates 15, 15 and the hatch receiving plate 13 for securing the closed state of the snow opening 5 by the hatch plates 15, 15, Even when the hatches 15 and 15 are assembled to the hatch frame 10, the hatches 10 are not bulky. Therefore, until the assembly of the hatch 10 is almost completed, the hatch 10 can be manufactured at a low cost in a factory where the machining accuracy can be easily obtained. Because of the small space in the assembled state, the transportation and storage costs are reduced, and the number of assembling steps on the construction site is significantly reduced as compared with the same type of conventional hatch structure for a snow throwing port. High productivity can be provided at low cost.

(5) A pair of hatch shafts 20, 20, which are attached to the center of the hatch frame 11 at appropriate intervals, are provided with a pair of hatch plates 15, 1, which substantially divide the hatch opening 10A into two.
5 and the balance weights 25, 25, 45, 45 that substantially balance the hatch plates 15, 15, the hatch receiving plates 13, 13, provided on the hatch frame 11 of the snow hole hatch 10. U-shaped side plates 14, 14, hatch plate 1
5, 15, hatch axis 20, 20, balance weight 2
Most of the left and right parts constituting the hatch 10, such as 5, 25, 45, 45, etc., can be configured to have the same structure, and the parts can be shared, so that the hatch structure for the snow opening can be provided at low cost.

(6) Snowfall area 3 such as snowfall groove 3, snowmelt tank, etc.
Hatch plate 15 of hatch 10 at the top of snow opening 5
15 can be easily opened and closed by hand, and the time required for opening and closing the snow opening 5 can be shortened compared to the conventional hatch structure, so that the general vehicle on the road surface 1 around the snow area 2 where the snow opening 5 is installed. The time that hinders the traveling of the vehicle and the passage of pedestrians is reduced as compared with the conventional example.

(7) Vertical side plates 11A on both sides of the hatch frame 11, U-shaped side plates 14, 1 provided outside the central portion of 11A.
4, the one end extensions 20A, 20A of the hatch shafts 20, 20
, Balance weights 25, 25, 45, 4
5 can be well supported in two layers, and the balance weight 2
Since 5, 25, 45, and 45 are provided in the recesses 9 and 9 formed in both outer walls 5A and 5A of the snow opening 5, the snow to the snow opening 5 is balanced by weights 25, 25, and 45. ,
It falls smoothly without fear of hitting 45.

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view of a hatch structure for a snow throwing port such as a snow drift groove according to the present invention, in which a hatch plate is erected and a snow throwing port top is opened.

FIG. 2 is a schematic plan view of the hatch structure for a snow throwing port such as a snowfall groove according to the present invention in a state where a hatch plate is laid down and a hatch opening is closed.

FIG. 3 is a schematic vertical sectional view taken along the line AA of FIG. 2;

FIG. 4 is a schematic side view of the embodiment of the hatch structure for a snow throwing port such as a snowfall groove according to the present invention, around a bell crank-shaped hook mounting portion provided below an end of a hatch plate;

FIG. 5 is a schematic side view illustrating a modified example of the balance eat in the hatch structure for a snow throwing port such as a snow drift according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Road surface 2 ... Snow throwing area 3 ... Snow flow groove 5 ... Snow opening 5A ... Side wall 6 ... Snow opening frame 7 ... L-shaped frame plate 7B ... Recess 8 ... Positioning plate 9 recess 9A side wall 9B front wall 9C top plate 10 hatch opening hatch 10A hatch opening 11 hatch frame 11A side plate 11B top plate 12 cutout 13 ... Hatch receiving plate 13A... Nylon resin plate 13B... Stop pin 14... U-shaped side plate 14B... Front plate 15. Bell crank shaped hook 17A Base 17B Hook 18 Shaft 19 Stopper 20 Hatch shaft 20A Extension of hatch shaft 25 Balance weight 25B End of balance weight 32 Operation stick 33 ... grasping part 34 ... Maximum upright angle of the locking portion 45 ...... balance weight 45A ...... arcuate portion 45B ...... end 46 ...... hole theta ...... hatch plate

Claims (2)

(57) [Claims] 1. A pair of hatch shafts 20, 20 are provided laterally at an appropriate interval L at the center of a hatch frame 11 provided at the top of a snow opening 5 in a snow throwing area 2. The lower part of one side of the hatch plates 15, 15 which divides the hatch opening 10 A into approximately two parts, and the concave part 9 provided in the side wall 5 A of the snow opening 5 at one end of the hatch shafts 20, 20 opposite to each other.
9, the hatch plate 1
Balance weight 25, 2, which is almost balanced with 5, 15
5, 45, 45 are provided, and the balance weights 25, 25, 45, 45 in the upright state of the hatch plates 15, 15 are provided.
The front end portions 25B, 25B, 45B, 45B of the recesses 9 and the front walls 9B, 9B of the recesses 9, 9 prevent the hatch plates 15, 15 from being excessively opened. Hatch structure for snow throwing openings such as snow grooves and snow melting tanks. 2. A pair of hatch shafts 20, 20 are provided laterally at an appropriate interval L at the center of a hatch frame 11 provided at the top of the snow opening 5 in the snow throwing area 2. The lower part of one side of the hatch plates 15, 15 which divides the hatch opening 10 A into approximately two parts, and the concave part 9 provided in the side wall 5 A of the snow opening 5 at one end of the hatch shafts 20, 20 opposite to each other.
9 to the extensions 20A, 20A
Balance weight 25, 2, which is almost balanced with 5, 15
5, 45, 45 are provided, and the balance weights 25, 25, 45, 45 in the upright state of the hatch plates 15, 15 are provided.
Of the front ends 25B, 25B, 45B, 45B of the recesses 9 and the front walls 9B, 9B of the recesses 9, 9 or the front plates 14B, 14B of the U-shaped side plates 14, 14 disposed in the recesses 9, 9. By contact, excessive opening of the hatch plates 15, 15 is regulated,
And a hatch opening 10 formed by the hatch plates 15, 15.
A hatch structure for a snow throwing opening such as a snow drift, a snow melting tank, etc., provided with means 13B, 13B, 17, 17 for securing the closed state of A.