Threaded and squeeze-off devices

Abstract

To provide a screwing device which is improved in workability.SOLUTION: A screwing device arranged at a pressing device for pressing a pressing object by a pressing part, screwed with an external peripheral part of a shaft extending from the pressing part, and adjusting a pressing force of the pressing part corresponding to a progress of the shaft comprises: a support part fixed to the pressing device; and a screwing part having a screwing face screwed with the external peripheral part of the shaft, arranged so as to move to a direction opposite to an advance direction of the shaft with respect to the support part according to screwing for progressing the shaft toward the pressing object, and formed so as to be capable of changing a screwing posture at which the screwing face abuts on the external peripheral part of the shaft, and a separation posture at which the screwing face separates from the shaft. The screwing part has a lock part for locking the screwing posture by being engaged with the support part according to the movement to the opposite direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to threaded and squeeze-off devices. [Background technology]

[0002] Conventionally, threading devices that thread onto the outer periphery of a shaft that presses against a pressing object such as a pipe have been put into practical use. For example, threading devices are used in squeeze-off devices that temporarily block the flow of fluid such as gas through a pipe.

[0003] For example, Patent Document 1 discloses a pipeline blocking device that can easily block a pipeline. This device is configured so that a pressing operation part that screws onto a pressing operation shaft is disposed, and by moving the pressing operation part along the pressing operation shaft, the existing pipeline is crushed between a first clamping member and a second clamping member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-106109 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the device of Patent Document 1, the pressing operation part is arranged to advance and retreat along the entire length of the pressing operation shaft by screwing, so the pressing operation part needs to advance and retreat along the pressing operation shaft by screwing, not only when crushing the existing pipeline with the clamping member, but also in the work before and after that. For example, the pressing operation part needs to be rotated and advanced relative to the pressing operation shaft until it abuts against the clamping member. This makes it difficult to move the pressing operation part smoothly relative to the pressing operation shaft, which could reduce the operability of the pressing operation part.

[0006] An object of the present disclosure is to provide a threading device and a squeeze-off device with improved workability. [Means for solving the problem]

[0007] The screwing device according to the present disclosure is a screwing device that is disposed in a pressing device that presses a pressing object with a pressing portion, and is screwed onto the outer periphery of a shaft extending from the pressing portion to adjust the pressing force of the pressing portion in accordance with the advancement of the shaft, and includes a support portion fixed to the pressing device, and a screwing portion having a screwing surface that screws onto the outer periphery of the shaft, and disposed so as to move relative to the support portion in a direction opposite to the advancement direction of the shaft in accordance with screwing that advances the shaft toward the pressing object so as to press the pressing object, and is formed so as to be changeable between a screwing position in which the screwing surface abuts the outer periphery of the shaft and a separated position in which the screwing surface is separated from the shaft, and the screwing portion has a locking portion that engages with the support portion in accordance with movement in the opposite direction to lock the screwing position.

[0008] The squeeze-off device according to the present disclosure includes the above-described screwing device, a pair of pressing portions arranged to crush the piping between them, and a shaft formed to extend from one of the pair of pressing portions, with its outer periphery screwed into the screwing device and arranged so as to be movable forward and backward relative to the piping. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to improve workability. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a configuration of a squeeze-off device including a screwing device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a top view showing the configuration of a screwing device. [Figure 3] FIG. 2 is a partial cross-sectional view showing the configuration of a screwing device. [Figure 4] FIG. 10 is a partial cross-sectional view showing a state in which the screw-engagement portion is in a separated position. [Figure 5]FIG. 10 is a cross-sectional view showing how the distal shaft is threadedly engaged with the threaded portion. [Figure 6] 10 is a cross-sectional view showing a state in which the threaded portion moves relative to the support portion in a direction opposite to the direction of travel of the shaft. FIG. [Figure 7] 10A and 10B are diagrams illustrating how a locking portion locks the orientation of a screw-engaging portion. [Figure 8] FIG. 10 is a diagram showing how piping is accommodated in a main body support portion. [Figure 9] 10A and 10B are diagrams illustrating a state in which the pressing portion is advanced toward the pipe. [Figure 10] FIG. 10 is a diagram showing a state in which the piping is crushed by the pressing portion. [Figure 11] 10 is a diagram showing how the piping is removed from inside the main body support portion. FIG. [Figure 12] 10 is a diagram showing the configuration of a screwing device according to a second embodiment. FIG. [Figure 13] 10 is a diagram showing the configuration of a pressing device provided with a screwing device according to a third embodiment. FIG. [Figure 14] 10 is a diagram showing the configuration of a pressing device provided with a screwing device according to a fourth embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0012] (Embodiment 1) 1(a) and 1(b) show the configuration of a squeeze-off device equipped with a screwing device according to a first embodiment of the present disclosure. The squeeze-off device is used to press a pipe G and includes an operating unit 1, a shaft 2, a device body 3, and a screwing device 4. The squeeze-off device constitutes the pressing device of the present disclosure. The pipe G constitutes the object to be pressed according to the present disclosure and can be, for example, a gas pipe or a water pipe through which a fluid flows.

[0013] The operating unit 1 is used to operate the pressure applied to the pipe G by the device body 3, and is formed in a rod shape that can be held by the operator.

[0014] The shaft 2 has a base-end shaft 2a and a tip-end shaft 2b. The base-end shaft 2a is arranged to extend from the operation unit 1 toward the device body 3. One end of the tip-end shaft 2b is detachably connected to the tip of the base-end shaft 2a, and the other end is arranged to extend into the device body 3. The shaft 2 is also arranged to be rotatable around itself relative to the device body 3, and a male thread that screws into the screwing device 4 is formed on the outer periphery of the tip-end shaft 2b, which is inserted into the device body 3 via the screwing device 4.

[0015] The device body 3 has a body support part 5, a grip part 6, and a pair of pressing parts 7a and 7b.

[0016] The main body support part 5 supports the pressing parts 7a and 7b and has a pair of side parts 5a and 5b. The side parts 5a and 5b are each L-shaped, with their rear parts overlapping each other in the extension direction D1 of the shaft 2 and their front parts extending in the extension direction D1 while facing each other in the width direction D2. That is, the side parts 5a and 5b are combined into a U-shape with an opening formed at the tip. The front parts of the side parts 5a and 5b are arranged to face each other with a distance large enough to accommodate the piping G inside.

[0017] Furthermore, side portion 5b is connected to side portion 5a by a rotation shaft 5c extending at its rear portion in thickness direction D3 perpendicular to extension direction D1 and width direction D2 so as to be rotatable in width direction D2 relative to side portion 5a. Furthermore, tip-side shaft 2b is inserted in the extension direction D1 through the rear portions of side portions 5a and 5b, and the tip end of tip-side shaft 2b is arranged to extend between the front portions of side portions 5a and 5b. In addition, the front-rear direction in this disclosure is the direction in which the shaft 2 is advanced and retreated to press the pipe G, and when the shaft is advanced from above the pipe G, for example, the downward direction is the front.

[0018] The gripping portion 6 is for an operator to grip and support the device main body 3, and is arranged to extend laterally from the rear of the main body support portion 5.

[0019] The pressing portions 7a and 7b are formed in a rod shape extending in the width direction D2 between the front of the side portion 5a and the front of the side portion 5b, and are arranged opposite each other in the extension direction D1 so as to crush the piping G between them.

[0020] The pressing portion 7a is disposed rearward of the pressing portion 7b, and both ends thereof are attached to the side portions 5a and 5b so as to be movable in the extension direction D1. The tip-side shaft 2b is connected to the rear portion of the pressing portion 7a via a bearing so as to be rotatable about itself. This allows the pressing portion 7a to move in the extension direction D1 along the side portions 5a and 5b in accordance with the advancement and retreat of the shaft 2. The pressing portion 7a moves toward the pressing portion 7b, thereby pressing the piping G so as to crush it between the pressing portion 7a and the pressing portion 7b.

[0021] A push-up portion 8 is disposed at the rear of the main body support portion 5 so as to protrude toward the pressing portion 7a. This push-up portion 8 is disposed so as to penetrate the side portion 5a and move in the extending direction D1. When the pushing portion 7a retracts, the push-up portion 8 is pressed rearward, and moves so as to push the side portion 5b rearward relative to the side portion 5a. This causes the side portion 5b to rotate outward around the rotation axis 5c and away from the side portion 5a.

[0022] The pressing portion 7b is disposed near the tip of the body support portion 5. One end of the pressing portion 7b is rotatably attached to the side portion 5a by a pivot 7c extending in the thickness direction D3, and the other end is engaged with and supported by the side portion 5b. When the front surface of the pressing portion 7b is pressed against the pipe G (the pipe before being housed in the body support portion 5), the other end of the pressing portion 7b rotates toward the pressing portion 7a around the pivot 7c. This rotation of the pressing portion 7b opens the tip of the body support portion 5, allowing the pipe G to be housed in the body support portion 5 through the opening. The pressing portion 7b is biased by a biasing portion (not shown) to rotate forward. When the pipe G is housed in the body support portion 5, the pressing portion 7b rotates in response to the bias to close the opening of the body support portion 5 (returning to its original position). In this way, the pipe G can be housed between the pressing portion 7a and the pressing portion 7b inside the body support portion 5, as shown in FIGS. 1(a) and 1(b).

[0023] On the other hand, when side portion 5b of main body support portion 5 rotates outward about rotation axis 5c so as to move away from side portion 5a, the engagement supporting the other end of pressing portion 7b is released. As a result, pressing portion 7b rotates forward about rotation axis 7c so as to move away from pressing portion 7a, main body support portion 5 opens, and piping G can be removed from inside main body support portion 5.

[0024] The screwing device 4 is screwed onto the outer periphery of the tip side shaft 2b to adjust the pressing force of the pressing portions 7a and 7b according to the progress of the shaft 2, and has a pair of support portions 9a and 9b and a pair of screwing portions 10a and 10b.

[0025] The support parts 9a and 9b have plate shapes that face each other with the tip-side shaft 2b sandwiched between them in the thickness direction D3, and are joined together by a joining part 9c located at their front parts. The joining part 9c has a plate shape and is arranged perpendicular to the extension direction D1. A fixed pipe 11 extending in the extension direction D1 is arranged below the joining part 9c. The rear end of the fixed pipe 11 is joined together with the joining part 9c, and the front end is connected to the main body support part 5. The tip-side shaft 2b is arranged to extend into the main body support part 5 via this fixed pipe 11. In this way, the support parts 9a and 9b are fixed to the main body support part 5 by the fixed pipe 11 so as to be movable along the tip-side shaft 2b.

[0026] A biasing portion 12 is disposed along the outer peripheral wall of the fixed pipe 11 between the connecting portion 9c of the support portions 9a and 9b and the main body support portion 5. This biasing portion 12 biases the side portion 5b of the main body support portion 5 so as to press it forward against the connecting portion 9c. The biasing portion 12 can be formed, for example, from a spring.

[0027] In addition, support portions 9a and 9b each have recesses 13 formed inward on both sides. That is, recesses 13 are formed at four locations on both sides of support portion 9a and both sides of support portion 9b so as to reduce the width of support portions 9a and 9b.

[0028] The threaded portions 10a and 10b are disposed between the support portions 9a and 9b so as to face each other across the distal shaft 2b in the width direction D2. A pivot 14 is disposed in each of the threaded portions 10a and 10b, extending through the threaded portions 10a and 10b in the thickness direction D3, which intersects with the shaft 2. The pivot 14 rotatably supports the threaded portions 10a and 10b around itself, and both ends of the pivot 14 are connected to the support portions 9a and 9b. That is, the pivot 14 rotatably supports the threaded portions 10a and 10b relative to the support portions 9a and 9b. The rear portions of the threaded portions 10a and 10b are formed to extend outward in the width direction D2, and by grasping these rear portions, the operator can rotate the front portions of the threaded portions 10a and 10b so as to move away from each other.

[0029] Furthermore, locking portions 15 are arranged in front of the threaded portions 10a and 10b, corresponding to the recessed portions 13 of the support portions 9a and 9b. These locking portions 15 are used to lock the orientation of the threaded portions 10a and 10b relative to the support portions 9a and 9b, and are arranged so as to protrude from the surfaces of the threaded portions 10a and 10b into the recessed portions 13. That is, the locking portions 15 are arranged in four locations: two locations on the threaded portion 10a and two locations on the threaded portion 10b, corresponding to the four recessed portions 13, respectively.

[0030] Next, the configuration of the screwing device 4 will be described in detail.

[0031] 2, the threaded portions 10a and 10b have threaded surfaces 16 on their inner wall portions facing each other with the tip-side shaft 2b in between, which thread onto the outer periphery of the tip-side shaft 2b. The threaded surfaces 16 are disposed so as to substantially surround the tip-side shaft 2b, and have a female thread formed thereon that corresponds to the tip-side shaft 2b.

[0032] 3, the threaded surface 16 is formed to extend in the extension direction D1 along the distal shaft 2b. The position of the threaded portions 10a and 10b in which the threaded surface 16 abuts against and threads onto the outer periphery of the distal shaft 2b is defined as a threaded position P1. The threaded portions 10a and 10b are provided with a biasing portion 17. The biasing portion 17 biases the rear portions of the threaded portions 10a and 10b so that they open outward relative to the rotation shaft 14, that is, biases the front portions of the threaded portions 10a and 10b so that they close inward (toward the distal end shaft 2b). This maintains the threaded portions 10a and 10b in the threaded position P1. The biasing portion 17 can be formed, for example, from a spring or the like.

[0033] Furthermore, threaded portions 10a and 10b are formed with movement grooves 18 extending in extension direction D1 at positions corresponding to rotation shaft 14. This allows threaded portions 10a and 10b to move in extension direction D1 relative to rotation shaft 14, i.e., to be arranged so as to be movable in extension direction D1 relative to support portions 9a and 9b. Further, the screw-threaded portions 10a and 10b are provided with biasing portions 19 that bias the screw-threaded portions 10a and 10b forward relative to the rotation shaft 14, i.e., in the direction of movement D1a of the shaft 2. The biasing portions 19 are used to release the lock on the attitude of the screw-threaded portions 10a and 10b that has been locked by the locking portion 15. Due to the biasing force of the biasing portions 19, the rotation shaft 14 moves rearward most along the movement groove 18, and the screw-threaded portions 10a and 10b are maintained in a position where they have moved forward most relative to the support portions 9a and 9b.

[0034] Furthermore, the fixed pipe 11 passes through the side portion 5b of the main body support portion 5 and is fixed to the side portion 5a. That is, the support portions 9a and 9b are fixed to the side portion 5a of the main body support portion 5 via the fixed pipe 11.

[0035] 4, for example, when an operator pinches the rear portions of the threaded portions 10a and 10b, the threaded portions 10a and 10b rotate about the rotation shaft 14 so that the front portions open outward against the biasing force of the biasing portion 17. This causes the threaded surface 16 to move away from the outer periphery of the distal shaft 2b, and this position of the threaded portions 10a and 10b becomes the separated position P2. In this way, the threaded portions 10a and 10b are formed so that they can be changed between the threaded position P1 and the separated position P2 by rotating about the rotation shaft 14.

[0036] Next, a detailed description will be given of the configuration in which the locking portion 15 locks the positions of the screw-engaging portions 10a and 10b. As shown in Fig. 5, with the threaded portions 10a and 10b in threaded orientation P1 and the threaded surfaces 16 of the threaded portions 10a and 10b in contact with the outer periphery of the tip-side shaft 2b, the shaft 2 is advanced in a direction D1a toward the piping G, thereby pressing the piping G with the pressing portions 7a and 7b. At this time, as the threaded portions 10a and 10b are threaded with the tip-side shaft 2b, the threaded surfaces 16 of the threaded portions 10a and 10b receive a reaction force R from the tip-side shaft 2b. As a result, as shown in Fig. 6, the threaded portions 10a and 10b move along the movement groove 18 relative to the rotation axis 14 in a direction D1b opposite to the direction D1a of advancement of the shaft 2, i.e., move in a direction D1b opposite to the direction D1a of advancement of the shaft 2 relative to the support portions 9a and 9b.

[0037] 7, the locking portions 15 are disposed in the recesses 13 of the support portions 9a and 9b and have abutment surfaces 15a that face the recesses 13 in the direction D1a of travel of the shaft 2. As the threaded portions 10a and 10b move in the opposite direction D1b, the locking portions 15 move in the opposite direction D1b relative to the support portions 9a and 9b, causing the abutment surfaces 15a to abut against the recesses 13. That is, the threaded portions 10a and 10b move in the opposite direction D1b until the abutment surfaces 15a of the locking portions 15 abut against the recesses 13 of the support portions 9a and 9b. As a result, the abutment surfaces 15a tightly engage with the support portions 9a and 9b, and the threaded portions 10a and 10b are locked in the threaded position P1.

[0038] Next, the operation of this embodiment will be described.

[0039] First, as shown in Fig. 8(a), the operator moves the device main body 3 toward, for example, a pipe G through which a gas flows. Here, the pipe G is made of a flexible material such as polyethylene.

[0040] 8(b), by continuing to move the device body 3 downward after the device body 3 reaches the pipe G, the back surface of the pressing part 7b is pressed against the pipe G, and the pressing part 7b rotates around the rotation axis 7c toward the pressing part 7a. As a result, the tip of the body support part 5 opens, and the pipe G is accommodated inside.

[0041] 8(c), when the piping G is completely housed inside the main body support part 5, the contact between the piping G and the pressing part 7b is released, and the pressing part 7b rotates around the rotation axis 7c due to the biasing force of a biasing part (not shown) so as to close the opening of the main body support part 5. Then, when the pressing part 7b faces the pressing part 7a, its end engages with the side part 5b of the main body support part 5, and the pressing part 7b is maintained in its original position.

[0042] Next, as shown in FIG. 4, the operator pinches the rear portions of the threaded portions 10a and 10b and rotates the threaded portions 10a and 10b about the rotation shaft 14 so that the front portions of the threaded portions 10a and 10b open outward. This causes the threaded portions 10a and 10b to assume a separated position P2 in which the threaded surfaces 16 are separated from the outer periphery of the tip-side shaft 2b. With the threaded portions 10a and 10b maintained in the separated position P2, the operator slides the shaft 2 in the forward direction D1a toward the pipe G. Then, as shown in FIG. 9, the operator advances the shaft 2 in the forward direction D1a until the pressing portion 7a reaches the pipe G.

[0043] In this way, the screwing portions 10a and 10b are formed so as to be changeable between a screwing position P1 and a separating position P2. Therefore, when the pressing portion 7a reaches the pipe G, it is not necessary to advance the shaft 2 while screwing it, but the shaft 2 can be slid along the screwing portions 10a and 10b in the separating position P2. Therefore, the operator can advance the shaft 2 quickly, improving the operator's workability. Furthermore, the screw-engaging portions 10a and 10b are arranged to be rotatable around a rotation axis 14 that extends in a direction intersecting with the shaft 2, and are changed from the screw-engaging position P1 to the separated position P2 by rotating the screw-engaging surface 16 away from the shaft 2. This allows the operator to easily change the screw-engaging portions 10a and 10b from the screw-engaging position P1 to the separated position P2, further improving the operator's workability.

[0044] In this way, when pressing portion 7a reaches pipe G, the operator releases the grips on threaded portions 10a and 10b. As a result, as shown in Fig. 3, threaded portions 10a and 10b rotate to close their front portions in accordance with the biasing force of biasing portion 17, and assume a threaded posture P1 in which threaded surface 16 abuts on the outer periphery of tip-side shaft 2b. In this way, the biasing portion 17 biases the front portions of the screw-threaded portions 10a and 10b to close, so that the operator can easily change the screw-threaded portions 10a and 10b from the separated position P2 to the screw-threaded position P1 simply by releasing the knob, thereby further improving the operator's workability.

[0045] Next, the operator rotates the operating unit 1 shown in FIGS. 1(a) and 1(b) to rotate the shaft 2 around itself so that the tip-side shaft 2b screws into the screw-engagement surfaces 16 of the screw-engagement portions 10a and 10b. Here, the tip of the tip-side shaft 2b is connected to the pressing portion 7a via a bearing so as to be rotatable around itself. Therefore, as the shaft 2 rotates, the rear surface of the pressing portion 7a slides around the tip-side shaft 2b, pushing the pressing portion 7a in the advancing direction D1a toward the pipe G. As a result, the pressing portion 7a presses the pipe G between itself and the pressing portion 7b as the tip-side shaft 2b advances.

[0046] At this time, as the tip-side shaft 2b moves in the advancing direction D1a, the threaded portions 10a and 10b that threadably engage with the outer periphery of the tip-side shaft 2b receive a reaction force R from the tip-side shaft 2b, as shown in Fig. 5. Receiving this reaction force R, the threaded portions 10a and 10b move in the opposite direction D1b along the movement groove 18 relative to the rotation shaft 14, i.e., move in the opposite direction D1b relative to the support portions 9a and 9b, as shown in Fig. 6.

[0047] As a result, as shown in FIG. 7 , the locking portion 15 moves in the opposite direction D1b within the recesses 13 of the support portions 9a and 9b in response to the movement of the screwing portions 10a and 10b, and its abutment surface 15a abuts and engages with the support portions 9a and 9b. At this time, if the screwing portions 10a and 10b rotate slightly outward from the screwing position P1, the abutment surface 15a contacts the support portions 9a and 9b, thereby maintaining the screwing position P1. Furthermore, as the screwing portions 10a and 10b move in the opposite direction D1b, the abutment surface 15a presses the support portions 9a and 9b backward, thereby reliably maintaining the screwing position P1. In this way, the screwing portions 10a and 10b are locked in the screwing position P1.

[0048] As described above, the threaded portions 10a and 10b have locking portions 15 that engage with the support portions 9a and 9b in response to movement in the opposite direction D1b to lock the threaded position P1. This allows the threaded portions 10a and 10b to be easily locked in the threaded position P1. This maintains the threaded position P1, allowing the distal end shaft 2b to be reliably threaded into the threaded portions 10a and 10b, and the shaft 2 to be smoothly moved in the forward direction D1a. This improves the operator's workability.

[0049] Furthermore, the locking portion 15 locks the screwing portions 10a and 10b in the screwing position P1 by the abutment surfaces 15a abutting and engaging with the support portions 9a and 9b in response to movement of the screwing portions 10a and 10b in the opposite direction D1b. This allows the locking portion 15 to easily lock the position of the screwing portions 10a and 10b with a simple configuration. Furthermore, the contact surface 15a is disposed so as to press the support portions 9a and 9b in response to movement of the screw-engaging portions 10a and 10b in the opposite direction D1b, thereby firmly locking the positions of the screw-engaging portions 10a and 10b.

[0050] 10, when the pipe G is completely crushed between the pressing portions 7a and 7b, the operator stops rotating the operating portion 1 and maintains the crushed state of the pipe G. This blocks the flow of gas through the pipe G, completing the squeeze-off operation.

[0051] In this way, the squeeze-off device of the present disclosure can quickly perform the squeeze-off work of the pipe G, so that in the event of a disaster such as an earthquake, the gas flowing through the pipe G can be quickly shut off and evacuation can be carried out, thereby preventing secondary disasters. In addition, the squeeze-off work can be quickly performed even in general repair work of the pipe G.

[0052] Subsequently, to release the gas cutoff, the operator rotates the operating unit 1 in the opposite direction to the above. This causes the shaft 2 to rotate in the opposite direction to the above and move back along the threaded surfaces 16 of the threaded portions 10a and 10b so as to move away from the piping G. In response to this movement of the shaft 2 back, the pressing portion 7a also moves back so as to move away from the pressing portion 7b.

[0053] As the pressing portion 7a retracts, the pressing force with which the pressing portions 7a and 7b press the piping G decreases, and the reaction force R (the reaction force R that the screwing portions 10a and 10b receive from the tip-side shaft 2b) shown in FIG. 5 decreases. Therefore, as the tip-side shaft 2b retracts, the screwing portions 10a and 10b advance along the movement groove 18 relative to the support portions 9a and 9b due to the biasing force of the biasing portion 19 that biases the screwing portions 10a and 10b in the advancement direction D1a relative to the support portions 9a and 9b. Then, as the screwing portions 10a and 10b advance, the locking portion 15 moves away from the support portions 9a and 9b, as shown in FIGS. 1(a) and 1(b), and the engagement is released.

[0054] In this way, the locking portion 15 has the biasing portion 19 that biases the screwing portions 10a and 10b in the direction of advancement D1a relative to the support portions 9a and 9b. Therefore, as the distal end shaft 2b retracts, the locked position of the screwing portions 10a and 10b can be easily released, further improving the operability of the operator.

[0055] As a result, by pinching the rear portions of the screw-engaging portions 10a and 10b, the operator can change the posture of the screw-engaging portions 10a and 10b to a separated posture P2 in which the screw-engaging surface 16 is separated from the outer periphery of the tip-side shaft 2b, as shown in Fig. 4. Then, while maintaining the screw-engaging portions 10a and 10b in the separated posture P2, the operator slides the shaft 2 in a direction away from the piping G. As a result, the operator retracts the shaft 2 until the pressing portion 7a abuts against the push-up portion 8, as shown in Fig. 11(a).

[0056] In this way, locking portion 15 is arranged to unlock the position of threaded portions 10a and 10b in response to the retraction of shaft 2. This allows the operator to easily change threaded portions 10a and 10b from the threaded position P1 to the separated position P2, and slide shaft 2 along threaded portions 10a and 10b in the separated position P2. This allows the operator to quickly retract shaft 2, further improving operability.

[0057] 11(b), the operator further retracts the shaft 2, causing the pressing portion 7a to press the pressing portion 8 rearward. Pressed by the pressing portion 7a, the pressing portion 8 moves rearward and pushes the side portion 5b of the main body support portion 5 rearward against the biasing force of the biasing portion 12. This causes the side portion 5b of the main body support portion 5 to rotate about the rotation axis 5c relative to the side portion 5a so as to increase the distance between the side portion 5a and the pressing portion 7b. In response to this rotation of the side portion 5b, the pressing portion 7b disengages from the side portion 5b, and the pressing portion 7b rotates to the opposite side of the pressing portion 7a due to the biasing force of the biasing portion (not shown).

[0058] By rotating pressing portion 7b, the tip of main body support portion 5 is opened, and the operator can easily remove pipe G from the opening of main body support portion 5 by retracting operation portion 1 relative to pipe G. Here, pipe G has returned to its original shape by being released from the pressure of pressing portions 7a and 7b, and the gas that was previously blocked is allowed to flow again.

[0059] According to this embodiment, the screwing portions 10a and 10b are formed so as to be changeable between a screwed position P1 and a separated position P2, and are arranged so as to move relative to the support portions 9a and 9b in a direction D1b opposite to the advancing direction D1a of the shaft 2 in response to screwing that advances the shaft 2 toward the pipe G so as to press the pipe G. Then, the locking portions 15 of the screwing portions 10a and 10b engage with the support portions 9a and 9b in response to movement of the screwing portions 10a and 10b in the opposite direction D1b, thereby locking the screwing portions 10a and 10b in the screwed position P1. This allows the shaft 2 to advance smoothly, improving the operator's workability.

[0060] (Embodiment 2) Hereinafter, a second embodiment of the present disclosure will be described. Here, differences from the first embodiment will be mainly described, and common reference numerals will be used for common features with the first embodiment, and detailed description thereof will be omitted.

[0061] In the above-described embodiment 1, the locking portion 15 is arranged so that the abutment surface 15a abuts against and engages with the support portions 9a and 9b, but this is not limited to this, as long as it can engage with the support portions 9a and 9b and lock the screwing portions 10a and 10b in the screwing position P1.

[0062] For example, as shown in FIG. 12, the threaded portions 10a and 10b may have a locking portion 21 instead of the locking portion 15 of the first embodiment, and the support portions 9a and 9b may have a locking groove 22 newly disposed therein.

[0063] The locking grooves 22 are arranged in the recess 13 so as to correspond to the locking portions 21, respectively. Here, the locking grooves 22 are formed so as to open toward the locking portions 21 and extend rearward from the openings. At this time, the locking grooves 22 are formed to have a size that can accommodate the locking portions 21.

[0064] The locking portions 21 are arranged in the recesses 13 of the support portions 9a and 9b so as to protrude from the surfaces of the screw-threaded portions 10a and 10b. Here, the locking portions 21 are formed so as to be accommodated in and engage with the locking grooves 22 as the screw-threaded portions 10a and 10b move in the opposite direction D1b, thereby locking the screw-threaded portions 10a and 10b in the screw-threaded position P1. Specifically, the locking portions 21 have an engagement surface 21a facing outward in the width direction D2, and this engagement surface 21a engages with the locking grooves 22 in the width direction D2 to prevent the screw-threaded portions 10a and 10b from rotating about the rotation shaft 14.

[0065] Next, the operation of this embodiment will be described.

[0066] First, as in the first embodiment, the operator advances the shaft 2 in the advancing direction D1a until the pressing portion 7a reaches the pipe G, and the threaded portions 10a and 10b are set to the threaded posture P1, as shown in Fig. 3. Next, the operator rotates the operating portion 1, thereby advancing the shaft 2 toward the pipe G while pressing the pipe G with the pressing portion 7a. Then, as shown in Fig. 6, as the tip-side shaft 2b moves in the advancing direction D1a, the threaded portions 10a and 10b move in the opposite direction D1b relative to the support portions 9a and 9b due to the reaction force R from the tip-side shaft 2b.

[0067] 12, in response to the movement of the screw-engaging portions 10a and 10b, the locking portions 21 move in the opposite direction D1b within the recesses 13 of the support portions 9a and 9b and are accommodated in the locking grooves 22. As a result, the locking portions 21 engage with the locking grooves 22 at the engagement surfaces 21a in the width direction D2, and lock the screw-engaging portions 10a and 10b in the screwing posture P1.

[0068] In this way, the locking portion 21 is accommodated in and engaged with the locking groove 22 in accordance with the movement of the screwing portions 10a and 10b, so that the screwing portions 10a and 10b can be firmly locked in the screwing position P1.

[0069] Here, the locking portion 21 is only required to maintain the screwing portions 10a and 10b in the screwing position P1 when housed in the locking groove 22, and is not limited to a structure in which the engagement surface 21a abuts against the locking groove 22. For example, the locking portion 21 may have a gap between the engagement surface 21a and the locking portion 21 within a range that allows the tip-end shaft 2b to be screwed into the screwing surface 16.

[0070] Furthermore, the locking portion 21 may be formed so that, when housed in the locking groove 22, an abutment surface that faces the locking groove 22 in the advancing direction D1a of the shaft 2 presses against the locking groove 22. This allows the engagement surface 21a and the abutment surface to engage with the locking groove 22, thereby firmly locking the screwing portions 10a and 10b in the screwing position P1.

[0071] In this way, as shown in FIG. 10, the pipe G is completely crushed between the pressing portions 7a and 7b, thereby completing the squeeze-off operation.

[0072] According to this embodiment, the locking portion 21 is accommodated in and engaged with the locking groove 22 in response to movement of the screwing portions 10a and 10b in the opposite direction D1b, thereby firmly locking the screwing portions 10a and 10b in the screwing position P1.

[0073] (Embodiment 3) Hereinafter, a third embodiment of the present disclosure will be described. Here, differences from the first and second embodiments will be mainly described, and common reference numerals will be used for common features with the first and second embodiments, and detailed descriptions thereof will be omitted.

[0074] In the above-described first and second embodiments, the screwing device 4 is disposed in a squeeze-off device, but the present invention is not limited to this and may be disposed in a pressing device that presses an object to be pressed with a pressing part.

[0075] 13, the screwing device 4 can be disposed in a pressing device that presses against a wall surface W. This pressing device has a shaft 2, the screwing device 4, and a pair of pressing portions 7a and 7b. The wall surface W can be, for example, the wall surface of a hole formed by excavating the ground.

[0076] The pressing portions 7a and 7b press the wall surfaces W, and are arranged corresponding to a pair of wall surfaces W facing each other.

[0077] The shaft 2 is disposed so as to extend between the pressing portions 7a and 7b, and has a base-side shaft 2a and a tip-side shaft 2b. One end of the base-side shaft 2a is fixed to the pressing portion 7b, and the other end is disposed so as to extend toward the pressing portion 7a. One end of the tip-side shaft 2b is fixed to the pressing portion 7a, and the other end is disposed so as to extend toward the pressing portion 7b. The other end of the tip-side shaft 2b is inserted into the base-side shaft 2a. The screwing device 4 has the same configuration as that of the first embodiment, and therefore the description thereof will be omitted.

[0078] With this configuration, when the distal end side shaft 2b is advanced toward the wall surface W so as to press against the wall surface W, the threaded portions 10a and 10b, as they thread onto the outer periphery of the distal end side shaft 2b, move relative to the support portions 9a and 9b in a direction D1b opposite to the direction of advancement D1a of the shaft 2. Then, the locking portion 15 engages with the support portions 9a and 9b so as to press against them as the threaded portions 10a and 10b move in the opposite direction D1b, thereby locking the threaded portions 10a and 10b in the threaded position P1.

[0079] According to this embodiment, the shaft 2 can be smoothly advanced in the pressing device that supports the wall surface W, and the workability of the operator can be improved. In this way, the screwing device 4 can be widely arranged in a pressing device that presses an object to be pressed with a pressing part, and can also be arranged in, for example, a vice that clamps and fixes an object to be pressed.

[0080] (Fourth embodiment) Hereinafter, a fourth embodiment of the present disclosure will be described. Here, differences from the first to third embodiments will be mainly described, and common reference numerals will be used for common features with the first to third embodiments, and detailed description thereof will be omitted.

[0081] In the above embodiments 1 to 3, the locking portion engages with the support portions 9a and 9b by advancing the tip-side shaft 2b so as to extend it toward the pressing object, but it may also be configured to engage with the support portions 9a and 9b by advancing the tip-side shaft 2b so as to retract it.

[0082] For example, as shown in Fig. 14, the screwing device 4 can be disposed in the opposite direction to the shaft 2 of the third embodiment. Here, the pressing portions 7a and 7b press the wall surface W so as to sandwich it.

[0083] With this configuration, when the distal shaft 2b is advanced toward the wall surface W so that the inner surfaces of the pressing portions 7a and 7b press against the wall surface W, i.e., when the distal shaft 2b is advanced in the advancing direction D1a so that the distal shaft 2b is accommodated within the proximal shaft 2a, the threaded portions 10a and 10b threadably engage with the outer periphery of the distal shaft 2b and move relative to the support portions 9a and 9b in the direction D1b opposite to the advancing direction D1a of the shaft 2. Then, the locking portion 15 engages with the support portions 9a and 9b so as to press them as the threaded portions 10a and 10b move in the opposite direction D1b, thereby locking the threaded portions 10a and 10b in the threaded position P1.

[0084] According to this embodiment, the shaft 2 can be smoothly advanced in the pressing device that clamps the wall surface W, and the workability of the operator can be improved.

[0085] In the above-described embodiments 1 to 4, the biasing portion 17 biases the front portions of the screw-threaded portions 10a and 10b so as to close them inward, but it may also bias the front portions of the screw-threaded portions 10a and 10b so as to open them outward, that is, so that the screw-threaded portions 10a and 10b assume the separated position P2.

[0086] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be interpreted as being limited by these embodiments. In other words, the present invention can be embodied in various forms without departing from the gist or main features thereof. For example, the disclosure of the shapes and numbers of each part described in the above-described embodiments is merely illustrative and can be modified as appropriate. [Industrial Applicability]

[0087] The screwing device according to the present disclosure can be used as a pressing device that presses an object to be pressed with a pressing portion. [Explanation of symbols]

[0088] 1 Control section 2 shafts 2a Base end shaft 2b Tip shaft 3. Device body 4. Threaded device 5 Main body support part 5a, 5b Side 5c Rotating shaft 6 Gripping part 7a, 7b Pressing part 7c rotation axis 8 Push-up part 9a,9b Support part 10a,10b threaded part 11 Fixed pipe 12. Actuation section 13 Recess 14 Rotating shaft 15,21 Lock section 15a Contact surface 16 Threaded surface 17. Actuation section 18 Moving groove 19. Actuation section 21a Engagement surface 22 Lock groove D1 Extending direction D1a Direction of travel D1b opposite direction D2 width direction D3 thickness direction G piping P1 Threaded position P2 Separate posture R reaction force W wall

Claims

1. A screwing device is disposed in a pressing device that presses a pressing target with a pressing part, and is screwed onto an outer periphery of a shaft extending from the pressing part to adjust the pressing force of the pressing part in accordance with the advancement of the shaft, a support portion fixed to the pressing device; a screwing portion having a screwing surface that screws into an outer periphery of the shaft, the screwing portion being disposed so as to move relative to the support portion in a direction opposite to the direction of advancement of the shaft in response to screwing that advances the shaft toward the object to be pressed so as to press the object to be pressed, the screwing portion being formed so as to be changeable between a screwing position in which the screwing surface abuts against the outer periphery of the shaft and a separated position in which the screwing surface is separated from the shaft; Equipped with The screwing device includes a locking portion, the locking portion engaging with the support portion in response to movement in the opposite direction to lock the screwed position.

2. 2. The screwing device according to claim 1, wherein the locking portion has an abutment surface facing the support portion in the direction of travel, and the abutment surface abuts and engages with the support portion in response to movement of the screwing portion in the opposite direction, thereby locking the screwing portion in the screwed position.

3. the support portion has a lock groove that opens toward the lock portion, The screwing device according to claim 1 or 2, wherein the locking portion is accommodated in and engaged with the locking groove in response to movement of the screwing portion in the opposite direction, thereby locking the screwing portion in the screwed position.

4. 4. The screwing device according to claim 1, wherein the locking portion has a biasing portion that biases the screwing portion in the direction of travel relative to the support portion.

5. The threaded portion includes a pair of threaded portions disposed so as to sandwich the shaft, The screwing device according to any one of claims 1 to 4, wherein the pair of screwing portions are rotatably arranged around a rotation axis extending in a direction intersecting with the shaft, and the screwing surfaces are rotated away from the shaft to change from the screwed position to the separated position.

6. The screwing device according to any one of claims 1 to 5, a pair of pressing portions arranged to crush the piping between them; a shaft formed to extend from one of the pair of pressing portions, with its outer periphery threadedly engaged with the threading device and arranged so as to be movable forward and backward relative to the piping.

Images