JP3157816B2 - Packing removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing removing device for removing packing.

[0002]

2. Description of the Related Art Conventionally, generally in the vicinity of a movable part,
A packing is provided to ensure sealing.
And, also in the valve device, packing is provided between the valve stem and the valve box. That is, the packing is formed in a ring shape through which the valve stem can be inserted, and the inner peripheral surface of the packing comes into contact with the outer peripheral surface of the valve stem, and the outer peripheral surface of the packing comes into contact with the valve box. The space between the valve box is sealed. Further, when the packing becomes old, the packing is removed from the valve device, and a new one is attached so that the necessary sealing property is continuously maintained.

[0003]

However, the operation of removing the old and deteriorated packing is performed by using the upper part of the packing.
It was not easy because the three rings became very hard. So, in the past, give up removing only the packing,
In many cases, the packing is removed by completely disassembling the valve device, which has been a very troublesome operation. In order to avoid the total disassembly of the valve device, there is a method in which a sharp steel material is beaten into the hardened packing with a hammer or the like, and the packing is divided and removed, but in this case, the packing box of the valve rod or valve box is used. However, there was a possibility that the surrounding parts could be damaged or damaged.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to remove only the packing without damaging surrounding parts of the packing. It is intended to provide a device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is an apparatus for removing an annular packing engaged with a shaft member, the device being disposed around the shaft member and cutting the packing. and Lachi has a blade to one of the upper or lower
At least two pieces with a jet wheel part on the outer periphery
An annular cutter, a handle for applying a rotational force about the shaft member to the cutter, and a handle provided between the cutter and the handle.
From the side of the cutter so as to surround the cutter.
A holder having an arm portion movably connected,
The ratchet wheel part is formed inside the arm part.
Characterized by being accommodated in the formed groove .

Further, the ratchet is formed from the bottom in the groove.
The ratchet pin that engages with the
The ratchet pin is housed inside the handle.
Preferably, it is biased by a spring.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the packing removing device of the present invention is applied as a device for removing an annular packing engaged with a valve stem of a valve device will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are a plan view and a side view of a packing removing device according to the present embodiment. The packing removing device 1 mainly includes a cutter 3, a holder 5, and a handle 7. The cutter 3 is formed in an annular shape having an inner diameter corresponding to the outer diameter of the valve stem (see also FIGS. 3 and 4). At the lower part of the cutter 3, six blades 9 projecting at equal intervals in the circumferential direction protrude. The lower surfaces of the six blades 9 are inclined in the same rotation direction. Thus, the cutter 3 can perform cutting only when rotating in one predetermined direction. Further, a ratchet wheel portion 11 having a plurality of claws projecting radially outward of the cutter 3 is formed on an upper outer peripheral portion of the cutter 3. The cutter 3 is shown in FIG.
As shown in FIG. 5, it is composed of a two-part piece composed of a left half part 3a and a right half part 3b which can be separated into two parts at a separation line S.

As shown in FIG. 1, FIG. 2 and FIG. 5, the holder 5 is composed of three pieces each including one holder base 5a and two holder arms 5b and 5c.
The holder base 5a and the holder arms 5b, 5c
Each of them is formed of an arc-shaped member extending in an angle range of approximately 120 degrees. The holder base 5a is connected to the handle 7. Pins 13 and 15 are provided at the end of the holder base 5a.
, One ends of the holder arms 5b, 5c are swingably connected. At the other ends of the holder arms 5b and 5c, a holder base 5a and holder arms 5b and 5c are provided.
1 and 2, holes 17a and 17b are provided which are concentrically aligned with each other when the entire holder 5 forms a substantially perfect circle as shown in FIGS. These holes 17a and 17b have a diameter to which the set pin 19 can be fitted. Holder base 5a and holder arm 5b,
A groove 21 for accommodating the ratchet wheel 11 of the cutter 3 is formed on the inner surface in the radial direction of 5c.

As shown in FIGS. 1, 2 and 5, the handle 7 is a rod-like member and is composed of two pieces, a front half 7a and a rear half 7b, which are separable in the longitudinal direction. Toride 7
The front end of the front half 7a is joined to the rear of the holder base 5a by welding or the like. A female screw is formed at the rear end of the front half 7a, and the female screw is screwed with a male screw formed at the front end of the rear half 7b.
The first half 7a is provided with a plunger 23 at its axial center.
Is provided with a through-hole 25 in the longitudinal direction through which is inserted. In addition, a plunger 23 is provided at the front axial portion of the rear half 7b.
A hole 27 in which the rear end is accommodated is formed. further,
A spring 29 is housed in the through hole 25.
The front end of the spring 29 is connected to the large-diameter portion 23 of the plunger 23.
a, and the rear end of the spring 29 is engaged with the front end of the rear half 7 b of the handle 7. Further, a ratchet pin 23b that engages with the pawl of the ratchet wheel 11 of the cutter 3 is formed at the tip of the plunger 23. Further, a through-hole 31 is formed in the holder base portion 5a, and the ratchet pin 23b projects through the through-hole 31 to the bottom of the groove 21.

Next, the operation of the packing removing apparatus according to the present embodiment configured as described above will be described. As shown in FIG. 6, the valve stem 43 of the valve device 41 and the valve box 45
Between them, an annular packing 47 is provided. When removing the packing 47, first, it is necessary to insert the annular cutter 3 through the valve stem 43 so that the blade 9 faces downward, that is, contacts the annular packing 47. Here, when both the upper and lower ends of the valve stem 43 are not exposed,
Although it is impossible to set the cutter 3 on the outer periphery of the valve stem 43 by sliding the cutter 3 in the longitudinal direction of the valve stem 43 as shown by an arrow V in the figure, the cutter 3 in this embodiment is not possible.
Is composed of two pieces consisting of a left half 3a and a right half 3b, so that the separated left half 3a and right half 3b are respectively valved from the side of the valve stem 43 as shown by arrow H in the figure. Stick 43
Attach to the outer circumference of. Then, the cutter 3 formed into an annular shape on the outer periphery of the valve stem 43 is surrounded and supported by the holder 5 from the outside. At this time, since the holder 5 has the two swingable holder arms 5b and 5c, the cutter 3 can be surrounded from the side. That is, the holder arm 5
With the b and 5c opened, the holder 5 is set to the side of the cutter 3 and the ratchet wheel 11 is inserted into the annular groove 21.
The holder arms 5b and 5c are closed so that the set pins 19 are accommodated, and the set pins 19 are passed through the holes 17a and 17b. Thus, the cutter 3 is rotatably supported by the holder 5.

Next, the plunger 23 and the spring 29 are inserted into the through hole 25 of the front half 7a of the handle 7, and the male screw of the rear half 7b is screwed into the female screw of the front half 7a. As a result, the ratchet pin 23b of the plunger 23 projects into the annular groove 21 and engages with one of the claws of the ratchet wheel portion 11. After the assembly of the packing removing device 1 is completed as described above, as shown by the arrow R in FIG.
When a force in one direction is applied to the handle 7, the force is transmitted to the cutter 3 via the ratchet pin 23 b and the ratchet wheel 11 that engage with each other, and the cutter 3 is moved to the valve rod 43.
Rotate clockwise around the axis O of Thereby, the blade 9 formed at the lower part of the cutter 3 also rotates integrally with the cutter 3, and the annular packing 47 is gradually cut. After the handle 7 is swung within a certain angle range, the handle 7 is swung in the opposite direction as shown by an arrow L in FIG. When a force in the opposite direction is applied to the handle 7, the ratchet pin 23b retracts into the through hole 31 against the elastic force of the spring 29, and the ratchet pin 23b disengages from the pawl of the ratchet wheel portion 11. While the cutter 3 is stationary, only the holder 5 and the handle 7 rotate counterclockwise. In this way, by alternately swinging the handle 7 in the directions of the arrow R and the direction of the arrow L within a predetermined angle range, the deteriorated and hardened packing 47 can be cut and easily removed. In addition, since there is no need for operations requiring know-how and experience, such as completely disassembling the valve device and driving steel material or the like, even a beginner can easily and quickly remove the packing.

The cutter in the packing removing device of the present invention is not limited to the above-described embodiment, but may be composed of, for example, three or more pieces. Instead, it may be composed of two or more pieces that are swingably connected to each other as in the relationship between the holder base and the holder arm. The holder in the packing removing device of the present invention may have one or three or more arm portions.

[0014]

As described above, according to the packing removing device of the first aspect of the present invention, even a beginner can easily use the device without disassembling the entire device and without damaging the peripheral portion of the packing. It is possible to remove the hardened packing. Also, the shaft member with which the packing
If both ends are not exposed, i.e., one end of the shaft
If the cutter cannot be inserted through the shaft member,
Even in this case, the cutter can be easily set. Sa
In addition, just swing the handle within the specified angle range,
Because it is possible to rotate the cutter more than 360 degrees,
Workers do not move from one place,
Packing can be removed even in a small space.

According to the packing removing device of the second aspect , the spring and the ratchet pin are provided inside the handle.
A ratchet mechanism is used to arrange a plunger with
Effective use of the handle as a storage area for parts when using
It is also suitable in terms of design.

[0016]

[0017]

[Brief description of the drawings]

FIG. 1 is a plan view of a packing removing device according to an embodiment of the present invention.

FIG. 2 is a side view of the packing removing device according to the embodiment of the present invention.

FIG. 3 is a side view of a cutter of the packing removing device according to the embodiment of the present invention.

FIG. 4 is a bottom view of the cutter of the packing removing device according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view of the packing removing device according to the embodiment of the present invention.

FIG. 6 is a perspective view of a valve device provided with a packing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Packing removal device, 3 ... Cutter, 5 ... Holder, 5
b, 5c: arm portion, 7: handle, 9: blade, 11: ratchet wheel portion, 23b: ratchet pin, 29: spring, 43: shaft member, 47: packing.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B25B 27/14 F16J 15/00 B26D 3/16

Claims (2)

(57) [Claims] 1. A device for removing an annular packing engaged with a shaft member, comprising a blade at one of an upper portion and a lower portion, which is disposed around the shaft member and cuts the packing, and a ratchet wheel.
An annular cutter having at least two pieces having an outer peripheral portion; a handle for applying a rotational force about the shaft member to the cutter; and a handle provided between the cutter and the handle.
From an arm that is swingably connected to surround the cutter.
A ratchet wheel portion , wherein the ratchet wheel portion is formed inside the arm portion.
A packing removing device housed in the formed groove . 2. The ratchet wheel from the bottom in the groove.
A ratchet pin engaging with the eel portion protrudes, and the ratchet pin is connected to a handle housed inside the handle.
The packing removing device according to claim 1, wherein the packing removing device is biased by a pulling .