JP2009114632A - Lock for manhole cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock for a manhole cover capable of washing away dust and dirt in the lock to the outside of the lock by spraying washing water from above the lock even if a worker allows the dust and dirt to enter an upward hook hole of the lock due to his/her carelessness. <P>SOLUTION: This lock for manhole cover is composed of an outer cylinder 11 fixed vertically on the manhole cover 3, a vertical rotary shaft 21 fitted and inserted into the outer cylinder, a locking/unlocking means 31 provided internally in the vertical rotary shaft and the outer cylinder, and a cam 22 for locking fixed at a lower end of the vertical rotary shaft. A water intake port is formed in a collar-shaped tumbler guide 21b provided in at least a main shaft 21a of the vertical rotary shaft. On the other hand, a water drain port 36 in the vertical direction is formed from an upper end to a lower end of a fixed cylinder 35 constituting the locking/unlocking means 31 to wash away the dust and dirt flowing into the water intake port through a key hole opening 15 in the outer cylinder from the water drain port 36. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lock for a manhole cover.

  First, the patent document 1 is proposed by the applicant. However, the patent document 1 describes that “the cylinder lock 1 is fixed in the recess of the manhole cover 2, and the front surface (upper surface) of the cylinder lock 1. A cover body 7 that is vertically displaceable with respect to a horizontal line on the upper surface of the manhole cover is provided via a vertical screw 15 having a predetermined length, and the cover body is an engagement portion (for example, an engagement pin) of the cylinder lock 1. ) In the engaged state in which the cover 5 is engaged, the cover body covers the front surface of the cylinder lock 1 (the upper surface having a hole), and a lock structure for manhole cover ”is described (the reference number is disclosed in Patent Document 1). thing).

  Therefore, the lock for manhole cover described in Patent Document 1 can completely prevent dust and rainwater from entering the keyhole as long as the cover body 7 covers the upper surface of the cylinder lock 1 having the hole. There is an advantage.

  The idea (configuration) of covering the front surface of the cylinder lock on the cover body during locking as in Patent Document 1 and exposing the front surface of the cylinder lock during unlocking can surely obtain the above advantages. .

  However, when the lock is inserted into the hole of the cylinder lock 1 and the locked state of the cam of the manhole cover is released, the cover body 7 is always rotated in a predetermined direction to expose the front surface of the cylinder lock 1. There is a hassle that work is necessary.

By the way, when opening the manhole cover 2 and entering the underground joint work groove, it is necessary to release the engagement state of the cover body 7, but (a) the worker cleans the upper surface of the manhole cover, and Thoroughly wash away the dust and dirt remaining on the upper surface of the cover body 7, and then slowly turn the cover body 7 until it is displaced from the lower part of the horizontal line on the upper surface of the manhole cover to its upper position. However, inadvertently, dust or dirt adhering to the upper surface of the cover body 7 or the manhole cover 2 may enter the upward lock hole of the cylinder lock 1.
Next, Patent Document 2 is also proposed by the applicant, and this is suitable when the present invention is applied. Moreover, although patent document 3 is an application of another company, this is also suitable when applying this invention. In addition, although patent document 4 describes the cylinder lock of the structure similar to the lock of this invention, the matter to drain is not described.
JP 2005-344364 A JP 2004-68594 A (Patent No. 3558518) Japanese Patent Laid-Open No. 2000-1868 Japanese Utility Model Publication No. 6-67747

  The intended purpose of the present invention is, in view of the problems of Patent Document 1, when the worker inadvertently enters dust or dirt into the upward pit (upper surface opening of the lock) (so-called clogging) However, by applying washing water from above the lock, the dust or dirt that has entered the lock through the lock hole opening is completely washed out from the lower end of the lock to the outside. The second purpose is to protect the dumbler and the urging spring constituting the application / unlocking means 31 from dust and dirt depending on the embodiment. The third object is that it is not necessary to add a cover body such as that of Patent Document 1 to the front surface of the cylinder lock (upper surface having a hole).

  The lock for a manhole cover of the present invention is internally provided across an outer cylinder 11 fixed to the manhole cover 3 in a vertical state, a vertical rotation shaft 21 fitted in the outer cylinder, and the vertical rotation shaft and the outer cylinder. In the lock for the manhole cover comprising the locking / unlocking means 31 and the locking cam 22 fixed to the lower end of the vertical rotating shaft, a hook-shaped tumbler provided on the main shaft portion 21a of the vertical rotating shaft A water suction port is formed in the guide portion 21b, while a vertical drain port 36 is formed from the upper end portion to the lower end portion of the fixed cylinder 35 constituting the applying / unlocking means 31, and the keyhole opening of the outer cylinder is formed. A lock for a manhole cover, wherein dust or dirt that has flowed into the water suction port from 15 is drained from the drain port.

  In the above configuration, the water intake port guides the tumbler moving in the vertical direction, while the vertical water discharge port 36 houses the urging spring 34. Further, the locking / unlocking means 31 includes upper and lower tumblers that are provided in the bowl-shaped tumbler guide portion 21b and move in the axial direction of the vertical rotation shaft, and the upper tumbler via the lower tumbler at the upper end of the outer cylinder. An urging spring 34 that is pressed against the inner surface, and a urging spring that is inserted into the outer cylinder and accommodated in the vertical accommodating portion 35a, and a fixed cylinder 35 that is externally fitted to the lower end portion of the vertical rotating shaft. It is characterized by. Further, a water inlet (27, 29) separate from the water inlet 25 is formed in the bowl-shaped tumbler guide portion 21b, while a drain outlet 36 communicating with the separate water inlet is formed on the peripheral wall of the outer cylinder. Forms a separate drainage port (16, 16A), and is characterized in that dust and dirt are also poured out from the second drainage port.

(A) Even when dust or dirt has inadvertently entered the upward lock hole 15 of the lock (so-called clogging), the dust in the lock can be removed by applying washing water from above the lock. And dust and dirt can be washed out completely from the lower end of the lock.
(B) The invention according to claim 2 can eliminate the problem that the spring pressure of the biasing spring 34 constituting the locking / unlocking means 31 does not act or the biasing spring 34 rusts as much as possible. . Further, the invention described in claim 3 can effectively use a lock called “Bramer's lock” or “80,000 lock” in its application.
(C) The invention according to claim 4 allows dust and dirt to flow out from the drain outlet formed in the peripheral wall of the outer cylinder, so that dust and dirt adhering to the upper surface of the lock are stored vertically in the fixed cylinder 35. It can flow also from other than the part 35a, and can improve the cleaning effect. In particular, in the case of an embodiment in which a plurality of types of water inlets are formed on the upper surface of the lock, the cleaning effect is great.

  Hereinafter, the best mode for carrying out the present invention shown in FIGS. 1 to 10 will be described.

(1) Environment for Implementation of the Invention FIG. 1 is a front view, FIG. 2 is a bottom view, FIG. 3 is an explanatory view from a plan view, and FIG. 4 is a schematic sectional view taken along line 4-4 of FIG. FIG. 4 is also a schematic explanatory diagram showing an environment for carrying out the invention.

  First, the implementation environment will be briefly described with reference to FIG. Reference numeral 1 denotes a body frame of a manhole. On the inner peripheral wall of the body frame 1, a locking part 2 having a lateral recess shape, a protruding arm shape or the like is formed. On the other hand, 3 is a disk-shaped manhole cover. As is well known, the manhole cover 3 is an opening / closing body that is pivotally attached at one end (base end) side and can be opened from the other end 3a. 4 is an attachment recess formed on the other end side 3a and having a fitting hole 5 on the bottom surface of the inner wall. In this attachment recess 4, the lock X for manhole cover of the present invention is fitted vertically. Has been.

  Next, FIG. 5 is a schematic explanatory diagram of the vertical rotation shaft 21. FIG. 6 is an explanatory diagram showing a partial cross section of the upper surface of the outer cylinder or the vertical rotation shaft. FIG. 7 is a schematic cross-sectional explanatory view taken along line AA of FIG. Further, FIG. 8 shows a suitable portion of the lower end portion of the rod-like operation key Y in a longitudinal section.

  As shown in the bottom view of FIG. 9, the rod-like operation key Y has a downward fitting recess 6 at the center of the lower end surface, and the fitting recess 6 has a vertical rotation shaft 21 of a lock X described later. The upper end portion of the main shaft portion 21a is fitted. The bar-like operation key Y has a plurality of insertion protrusions or notch-like recesses (recesses in the embodiment) 8 extending downwardly in the annular portion 7 forming the fitting recess 6. The notch-shaped recess 8 is provided with a predetermined interval in the circumferential direction. Further, the annular portion 7 is provided with a locking key positioning engagement pin 9 projecting inward and outward in the radial direction, and this engagement pin 9 is vertically connected to the upper end portion of the main shaft portion 21a shown in FIG. It engages with an engagement notch 26 formed in the direction. Hereinafter, specific requirements of the present invention will be described in order, but detailed reference numerals will be omitted.

(2) Outer cylinder 11 of lock X
Reference numeral 11 denotes an outer cylinder fixed in a vertical state in the mounting recess 4 of the manhole cover 3. A cap-shaped upper cover 12 is detachably provided on the flange-like upper end portion 11 a of the outer cylinder 11 by fitting or screwing. It is done. Since the flange-like upper end portion 11 a is supported by the peripheral edge portion of the fitting hole 5, it has a function of a locking portion that hangs the outer cylinder 11 from the attachment recess 4.

  Further, the upper surface 13 of the flange-shaped upper end portion 11a is a circular annular portion as shown in FIG. 3, and a notch 14 for positioning a key is formed in a radially outward direction at a part of the inner peripheral edge of the annular upper surface 13. A predetermined amount is formed. An inner surface of the annular upper surface 13 has a keyhole opening 15 in an annular shape or a circular shape. From the keyhole opening 15, an upper surface of a main shaft portion 21 a of the vertical rotation shaft 21 described later and a plurality of types of water inlets 25, 27, 29 Can be seen.

  In addition, a long cylindrical body portion 11b is continuously connected to the flange-like upper end portion 11a of the outer cylinder 11, and a plurality of types of drainage ports 16 and 16A are provided at appropriate portions of the body portion 11b. It is formed in the horizontal direction (see FIGS. 10 and 7).

  Further, a through hole 18 for the fixing tool 17 is formed at an appropriate position on the lower side of the body portion 11b, and the through hole 18 is screwed into a fixed cylinder constituting an application / unlocking means described later. Match the hole. The radius of the keyhole opening 15 on the annular upper surface 13 of the outer cylinder 11 is smaller than that of the internal space at the upper end portion of the outer cylinder 11.

(3) Vertical rotation axis 21 of lock X
Reference numeral 21 denotes a vertical rotation shaft fitted into the outer cylinder 11, and the upper end surface of the columnar main shaft portion 21 a located on the axis a of the vertical rotation shaft 21 is substantially flush with the annular upper surface 13 of the outer cylinder 11. On the other hand, the lower end surface of the main shaft portion 21 a protrudes from the annular lower end surface 19 of the outer cylinder 11 in a stepped shape, and a long plate-like locking cam (cylinder cam) 22 is inserted through the fixing means 23 at the protruding lower end portion. It is attached integrally. Therefore, when the vertical rotation shaft 21 is rotated by a predetermined amount around the axis a by the operating force of the rod-shaped operation key Y as a key, the end of the locking cam 22 is against the locked portion 2 of the body frame 1 described above. The state is engaged (locked) or disengaged.

  However, a first water inlet 25 is formed in the flange-shaped tumbler guide portion 21b provided in a radial direction at the upper end of the main shaft portion 21a of the vertical rotating shaft 21 with a predetermined interval in the circumferential direction (see FIG. 5). As shown in FIGS. 7 and 10, the upper tumbler 25 as a movable obstacle is engaged with these first water intake ports 25 in a vertical state.

  Further, an engagement notch 26 having a key lock positioning function is formed on the upper end side including the main shaft portion 21a of the vertical rotating shaft 21, and the engagement notch 26 is formed on the bowl-shaped tumbler guide portion 21b like a slide. The separate water inlet 27 is continuous.

  In addition, as shown in FIG. 4, the separate water inlet 27 is formed in an arc shape following the engagement notch 26 on the upper side of the vertical rotating shaft 21, and is a separate water outlet of the body portion 11 b of the outer cylinder 11. 16, dust and dirt that have entered through an engagement notch (herein also referred to as “second water inlet”) 26 are separated from the separate drain port (here, “second drain port for convenience”). It can also be poured out of the lock X from 16.

  The engagement notch 26 having a key lock positioning function is engaged with the engagement pin 9 when it is aligned with the key lock positioning notch 14 on the outer cylinder side as shown in FIG. As shown, a bar-like operation key Y can be inserted.

(4) Application / unlocking means 31
Reference numeral 31 denotes an application / unlocking means provided on the vertical rotary shaft 21 and the outer cylinder 11. The application / unlocking means 31 is an upper and lower tumblers 32, 33 that move in the axial direction of the vertical rotary shaft 21. And an urging spring 34 that presses the upper tumbler 32 against the inner surface (receiving surface of the upper tumbler groove) of the upper end portion (flange-shaped upper end portion 11 a) of the outer cylinder via the lower tumbler 33, and the outer cylinder 11. The urging spring 34 is housed in a vertical housing portion 35 a in a state, and includes a fixed cylinder 35 that is externally fitted to the lower end portion side of the main shaft portion 21 a of the vertical rotating shaft 21.

  Thus, the upper end surface of the fixed cylinder 35 is a so-called shear line L, and the second drain port 16 and the third drain port 16A described later are higher than or higher than the shear line L. Is straddling the shear line L (this embodiment).

  Here, since the upper and lower tumblers 32 and 33 as movable obstacles are aligned in the direction of the axis a, the configuration and operation of the lock X will be briefly described.

This type of lock X is referred to as “Bramer's lock” or “80,000 lock”. This Blamar lock has a complicated structure and is also called a special cylinder lock. The cylinder is composed of an outer cylinder 11 fixed to a lock body (for example, a manhole cover of a manhole lock in the present embodiment) 3, an inner cylinder (vertical rotating shaft in the present embodiment) 21 rotating therein, and The upper and lower tumblers 32 and 33 constituting the locking / unlocking means 31 and the springs 34 pressing these tumblers 32 and 33 against the rotation of the inner cylinder 21 are constituted.
In this embodiment, since the fixed cylinder 35 is fixed to the lower end side of the outer cylinder 11 via the fixing member 17, the upper tumbler 32 of the locking / unlocking means 31 together with the inner cylinder 21 can rotate around the axis a. It is.

  That is, as shown in FIG. 10, when the insertion portion 8 of the key Y is inserted into the hole opening 15, the upper and lower tumblers 32, 33 are aligned at a certain position (shear line) L and the cylinder functions. The state of cylinder 21 blocking is solved. In this respect, it is the same as an ordinary general pin cylinder lock in which the tumbler moves in the radial direction and is aligned at a position. FIG. 10 shows that the upper and lower tumblers 32 and 33 are aligned at a position (shear line) L on the upper end surface of the fixed cylinder 35 by inserting the key Y.

(5) Water inlet 25, 26, 28
Since a plurality of types of water inlets in this embodiment are formed on the upper side of the lock X, they will be specifically described here.

  First, what corresponds to the first water inlet 25 is a tumbler through-hole formed in the flange-shaped tumbler guide portion 21b of the main shaft portion 21a of the vertical rotating shaft 21 with a predetermined interval in the circumferential direction. As described above, the upper tumbler 32 is engaged with these first water inlets 25.

  Therefore, the first water inlet 25 is also a storage hole or a through hole of the upper tumbler 32. As described above, in this embodiment, at least one first water inlet 25 is formed in the tumbler guide portion 21b provided in a bowl shape on the upper end portion side of the main shaft portion 21a of the vertical rotation shaft 21, while Energizing springs for upper and lower tumblers are accommodated in a fixed cylinder 35 constituting the unlocking means 31, and at least one first drain outlet is provided at the lower end of the vertical accommodating portion 35a communicating with the first water inlet 25. 36 is formed, and dust and dirt are poured out from the first drain port 36.

  Next, what corresponds to the second water inlet is a water inlet 27 that is separate from the first water inlet 25 formed in a channel shape in the bowl-shaped tumbler guide portion 21 b from the main shaft portion 21 a of the vertical rotating shaft 21. It is. The separate water inlet 27 communicates with the second outlet 16 of the outer cylinder 11.

  As shown in FIG. 6, the third water inlet corresponds to the first water inlet 25 formed in the vicinity of the upper tumbler or between the upper tumblers in the circumferential direction as guided by the bowl-shaped tumbler guide portion 21b. It is a separate water inlet 29. In the present embodiment, the separate water inlets 29 are respectively formed between a plurality of upper tumblers 32 positioned in the circumferential direction, and are separate from the second outlets 16 formed in the upper portion of the body portion 11b of the outer cylinder 11. The drain outlets 16A communicate with each other. In addition, although the said four separate water inlets 29 are formed in total, for example, these numbers are not limited.

  Accordingly, in the present embodiment, the separate water inlet is formed between the water inlet 27 that is continuous with the engagement notch 26 formed in the main shaft portion 21a or the upper tumbler that is guided by the bowl-shaped tumbler guide portion 21b. One of the water intake ports 29 (one embodiment).

  Alternatively, the separate water inlets are both the water inlet 27 continuous to the engagement notch 26 formed in the main shaft portion 21a and the water inlet 29 formed between the upper tumblers guided by the bowl-shaped tumbler guide portion 21b. (Other examples).

  In the example shown in the embodiment of the present invention, the water inlet is a first water inlet (through hole for tumbler) 25 guiding the tumblers 32 and 33 moving in the vertical direction, while the vertical direction The drain port 36 is the vertical storage portion 35a of the fixed cylinder 35 that stores the biasing spring 34, but it is of course not limited to this embodiment.

  That is, one or a plurality of water inlets are formed in the bowl-shaped tumbler guide portion 21 b provided in the main shaft portion 21 a of the vertical rotating shaft 21, while from the upper end portion of the fixed cylinder 35 constituting the application / unlocking means 31. One or a plurality of drain ports 36 in the vertical direction are formed up to the lower end, and dust and dirt that have flowed into the water inlet (corresponding to the first water inlet) from the keyhole opening 15 of the outer cylinder are removed from the solid cylinder 35. In the embodiment that flows out from a drain port (corresponding to the first drain port 36) formed in the lower end part (including the lower end surface), a bowl-shaped tumbler guide portion other than the tumbler through holes for guiding the tumblers 32 and 33 A first water inlet 25 is formed at an appropriate portion of 21 b, and dust and dirt soil that has entered the first water inlet 25 are fixed other than the vertical storage portion 35 a for the bias spring 34 that stores the bias spring 34. First drain outlet at the lower end of the tube 35 It may be al emissions.

  Further, in FIG. 4, for convenience of explanation, the lock X is directly attached to the fitting hole 5 of the attachment recess 4. Of course, as in the embodiment of Patent Document 2, indirect via a vertical fixing cylinder. May be installed. In the latter case, a locking cam fixed to a lower end portion of a vertical rotating shaft described later is indirectly engaged with and disengaged from the locked portion 2 via another member.

  The present invention is mainly used in the civil engineering industry.

FIG. 1 to FIG. 10 are explanatory views showing the best embodiments of the present invention.
Front view. Bottom view Explanatory drawing from a plan view 4-4 schematic cross-sectional explanatory diagram (schematic explanatory diagram showing the environment of the invention) The schematic explanatory drawing of a vertical rotating shaft. Explanatory drawing which showed the upper surface of the outer cylinder or the vertical rotating shaft in a partial cross section. FIG. 7 is a schematic cross-sectional explanatory view taken along line AA in FIG. 6. Explanatory drawing of the longitudinal cross section of the appropriate location of the lower end part of the operation key Y. FIG. The bottom view of the operation key Y. Explanatory drawing of the state which inserted the operation key Y.

Explanation of symbols

X ... Lock for manhole cover, Y ... Operation key (joint key), 1 ... Body frame, 2 ... Locked part, 3 ... Manhole cover, 4 ... Mounting recess, 5 ... Fitting hole, 6 ... Downward fitting recess 7 ... annular part, 8 ... insertion part (protrusions, recesses, grooves, etc.) of the key, 9 ... engagement pin, 11 ... outer cylinder, 11a ... upper end part, 11b ... body part, 12 ... upper cover, 13 ... Annular upper surface, 14: Notch for positioning of joint key, 15 ... Key hole opening, 16 ... Second drainage port, 16A ... Third drainage port, 17 ... Fixing tool, 18 ... Through hole, 19 ... Annular lower end surface, 21 ... Vertical rotation Axis, 21a ... main shaft portion, 21b ... tumbler guide portion, a ... axis, 22 ... locking cam (cylinder cam), 23 ... fixing means, 25 ... first water inlet, 26 ... engagement notch (second water inlet) Part), 27 ... third water inlet, 29 ... third water inlet, 31 ... application and unlocking means, 32 ... upper tumbler, 33 ... lower Tumbler, 34 ... urging spring, 35 ... fixed cylinder, 35a ... vertical storage portion (the lower end portion is a first drain port), L ... shear line, 36 ... first drain port (drain hole).

Claims (4)

An outer cylinder 11 fixed to the manhole cover 3 in a vertical state, a vertical rotation shaft 21 fitted and inserted into the outer cylinder, and an application / unlocking means 31 provided over the vertical rotation shaft and the outer cylinder; In the lock for the manhole cover comprising the locking cam 22 fixed to the lower end of the vertical rotation shaft, a water inlet is formed in the bowl-shaped tumbler guide portion 21b provided on the main shaft portion 21a of the vertical rotation shaft. On the other hand, the vertical drainage port 36 is formed from the upper end portion to the lower end portion of the fixed cylinder 35 constituting the application / unlocking means 31, and the dust that has flowed into the water suction port from the keyhole opening 15 of the outer cylinder. A lock for manhole cover, characterized in that dust or dirt is poured out of the drain port 36. The lock for manhole cover according to claim 1, wherein the water intake port guides a tumbler moving in the vertical direction, while the vertical water discharge port 36 houses a biasing spring 34. . In claim 1, the locking / unlocking means 31 includes upper and lower tumblers provided in the tumbler through hole 25 of the bowl-shaped tumbler guide portion 21b and moving in the axial direction of the vertical rotation shaft, and a lower tumbler. The urging spring 34 presses the upper tumbler against the inner surface of the upper end of the outer cylinder, and the urging spring is accommodated in the vertical accommodating part 35a in a state of being fitted into the outer cylinder, and at the lower end of the vertical rotating shaft. A lock for a manhole cover, comprising a fixed cylinder 35 to be fitted outside. In claim 1, the bowl-shaped tumbler guide portion 21b is formed with a water inlet (27, 29) separate from the first water inlet 25, while the separate water inlet is formed on the peripheral wall of the outer cylinder. A lock for a manhole cover, wherein a drainage port (16, 16A) separate from the first drainage port 36 communicating with the first drainage port 36 is formed, and dust and dirt are also poured out from the second drainage port.

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