Driving shaft for rotary power tool

Abstract

To prevent a rope from splitting and to avoid injuries due to the rotation of a rotary power tool even if the tool is accidentally driven in reverse after ascending when a type of a tool capable of switching between forward and reverse rotations is used as the rotary power tool.SOLUTION: Provided is a driving shaft 710 for a rotary power tool connectable to an input shaft 1A of an ascender, which comprises: the input shaft 1A drivable by an electric driver 600; a one-way clutch part that allows forward rotation of the input shaft 1A and restricts reverse rotation; and a rotation restriction / release part that restricts or releases rotation of the one-way clutch part around the input shaft. The driving shaft 710 includes: an outer shaft part 715; a cylindrical one-way clutch part 713 fixed to a hollow interior 716 at the tip of the outer shaft part 715; and an inner shaft part 717 rotatably supported inside the one-way clutch part 713, which is freely rotatable in one direction and restricted in the opposite direction. The inner shaft part 717 is configured to be freely connectable to the input shaft 1A of the ascender.SELECTED DRAWING: Figure 21

Description

[Technical field]

[0001] The present invention relates to a drive shaft for a rotary power tool, and more particularly to a drive shaft for a rotary power tool suitable for driving a powered climber. [Background technology]

[0002] The applicant of this application previously invented an ascending device that enables ascent using a portable rotary power tool such as an electric screwdriver (Patent Publication No. 6507463). This ascending device is small and space-saving, making it possible to use it in places where there is no commercial power supply.

[0003] Specifically, for example, in the example shown in Figs. 23 to 26 of Japanese Patent No. 6507463, as in the climbing device 100 shown in Figs. 1 to 4 attached to the present application, there is an input shaft 1 to which a drive shaft 602 (driving tip tool, see Fig. 8) attached to a chuck 601 of a rechargeable electric screwdriver 600 as an example of a rotary electric tool can be detachably connected, and an output shaft 4 connected to a pulley 3 around which a rope 2 can be detachably wound, and a differential reduction type reduction gear 5 that reduces the rotation applied to the input shaft 1 and transmits it to the output shaft 4, a support 6 to which the front surface of the reduction gear 5 is attached, and a rope 2 provided at the upper end of the front surface of the support 6 and wound around the pulley 3 arranged on the front side of the support 6. The pulley 3 includes a rope inlet / outlet section 9 including an inlet section 7 and an outlet section 8 which form the inlet and outlet of the rope 2, a cam-type limiting means 300 provided on the front surface of the support 6 and limiting the inlet side of the rope 2 from being pulled outward, an attachment hole 11 provided on the lower part of the support 6 for attaching other ropes or carabiners, hooking sections 12 and 13 provided on both the front and rear surfaces of the upper right corner of the support 6 to allow the outlet side of the rope 2 to be wound around and hooked, a pulley cover 14 journaled on the lower part of the front surface of the support 6 and surrounding the front and side of the pulley 3 so as to be freely opened and closed, and a sealed case 15 attached to the back surface of the support 6 and covering the side and back surface of the reduction gear 5. The reduction gear 5 and the sealed case 15 constitute the reduction gear means 50 (note that the limiting means 300 is omitted in FIG. 1).

[0004] An opening 16 is formed in the center of the back surface of the sealed case 15, into which a drive shaft 602 can be inserted and removed. The input shaft 1 has a cylindrical shaft hole 17 with a key groove 18, and as shown in Fig. 8, a cylindrical drive shaft 602 with a key portion 603 is attached to a chuck 601 of a rechargeable electric screwdriver 600, and the drive shaft 602 is inserted and connected into the shaft hole 17 while fitting the key portion 603 into the key groove 18, and the input shaft 1 can be rotated by driving the rechargeable electric screwdriver 600. The output shaft 4 protrudes from an opening (not shown) in the support body 6 to the front side, and a pulley 3 is connected to its end.

[0005] The reduction gear 5 incorporates a differential reduction mechanism with a large reduction ratio using a cycloid reduction mechanism or a trochoid reduction mechanism, and reduces the rotation of the input shaft 1 before transmitting it to the output shaft 4. Here, as an example, the reduction gear 5 is of a type in which the input shaft 1 and the output shaft 4 rotate in opposite directions, and the positive rotation direction is when the input shaft 1 rotates clockwise and the output shaft 4 rotates counterclockwise when viewed from the front side of the rope traction device. The reduction gear 5 may be, for example, a rolling ball type reducer or a pin type cycloid reducer in which the input and output shafts are coaxial.

[0006] The cam-type limiting means 300 is mounted on the upper right part of the front side of the support 6, between the outlet 8, the pulley 3, and the hooking part 12. Of the limiting means 300, 301 is a support plate mounted on the upper right part of the front side of the support 6, and the right side is bent into a U-shape to form a bent part 305 on the inside of which a rotating shaft 304 is rotatably mounted. The base end of a cam 308 having a number of teeth 307 protruding from an outer periphery 306 is fitted to the rotating shaft 304. The cam 308 can rotate around the rotating shaft 304 in a direction approaching and a direction away from the rope passed through the rope groove of the rope abutment part described later (see arrows M and N in FIG. 3). Between the rotating shaft 304 and the cam 308, a spiral spring (not shown) is interposed to constantly bias the cam 308 in the counterclockwise direction in FIGS. 2 and 3.

[0007] A rotating shaft 309 is rotatably mounted near the center of the cam 308, and a base end of an L-shaped release operation member 310 is fitted to the rotating shaft 309. A cylindrical operation protrusion 311 protruding forward from the support 6 is mounted on a corner of the release operation member 310, and the release operation member 310 can be rotated about the rotating shaft 309 by operating the operation protrusion 311 with a finger (see arrows O and Q in FIG. 3). The tip side of the release operation member 310 is bent into a J shape to form an engagement portion 312 that releasably engages with the outer side of the bent portion 305 of the support plate 301. A spiral spring (not shown) is interposed between the rotating shaft 309 and the release operation member 310 to constantly bias the release operation member 310 in the clockwise direction in FIGS. 2 and 3.

[0008] Separator 40, which separates the inlet side and outlet side of rope 2 wound around pulley 3 into left and right sides, extends obliquely downward on the right side in Fig. 3 like an aquiline nose to form rope abutment part 45 loosely inserted into H-groove 31 (see Fig. 6) of pulley 3, and rope groove 46 with an arc-shaped cross section is formed on the outer surface side of rope abutment part 45. Pulley cover 14 has opening 140 formed on the side surface in the upper right part of Fig. 2, so that cam 308 and release operating member 310 do not interfere with pulley cover 14 even when they rotate.

[0009] To explain how to load the rope when using a climbing device configured as shown in Figures 1 to 4, for example, for climbing along the outer wall of a building, first, as shown in Figure 5, one end of the rope 2 is fixed to the parapet 401 on the roof of a building 400 to secure a fulcrum, and the other end is allowed to hang down to the ground. A user U wearing a ground harness (not shown) first operates the operating protrusion 311 of the restricting means 300 with his / her finger, and rotates the cam 308 and the release operating member 310 in parallel to engage the engaging portion 312 with the outside of the bent portion 305 as shown in Fig. 6. The pulley cover 14 is opened, one end of the rope 2 is inserted into the rope insertion groove 20 of the entrance portion 7, passed through the left side of the separation portion 40 and wound slightly around the pulley 3 one turn, fitted into the rope groove 46 of the rope guide portion 45 of the separation portion 40, and inserted into the rope insertion groove 21 of the exit portion 8 (see Fig. 6), and then wound around the hook portions 12 and 13 to be hooked.

[0010] Then, the pulley cover 14 is closed, and the operation protrusion 311 of the release operation member 310 is operated with a finger to disengage the engagement portion 312, and the rotation of the cam 308 and the rotation of the release operation member 310 are performed in parallel, and the cam 308 is brought close to the rope 109 and the finger is released. The outer circumferential portion 307 of the cam 308 is urged to rotate in the rope direction by the spiral spring, and the rope 2 is pressed against the rope abutment portion 45 (see FIG. 7). When a force is applied to the rope 2 in a direction from near the rope exit of the pulley 3 (near the entrance of the rope groove 46) toward the exit portion 8 (see arrow T in FIG. 7), a clockwise external force is applied to the cam 308, but since the outer circumferential portion 307 is in a direction away from the rope 110 fitted in the rope groove 46, the cam 308 easily rotates in the clockwise direction, and the movement of the exit side rope 2a from the exit portion 8 to the outside is permitted. Conversely, when a force is applied to the rope 2 in a direction pulling it upward from the entrance portion 7 (see arrow U in Figure 7), a counterclockwise external force is applied to the cam 308. However, since this is a direction in which the outer periphery 307 approaches the rope 2 fitted in the rope groove 46, the outer periphery 307 of the cam 308 bites into the rope 2 and restricts its movement (the rope 2 is clamped between the cam 308 and the rope abutment portion 45).

[0011] After the user U connects the harness he or she is wearing to the mounting hole 11 of the climbing device 100 with a sling 402 (or a carabiner, etc. (not shown)), the user removes the exit rope 2a from the winding portions 12, 13 to pull the rope 2 and begin climbing. As shown in Figure 8, the drive shaft 602 attached to the chuck 601 of the rechargeable electric screwdriver 600 is connected to the input shaft 1, and the rechargeable electric screwdriver 600 is operated and rotated in the forward direction. The pulley 3 rotates in the forward direction after being slowed down by the reduction gear 5. At this time, since the restricting means 300 is in the direction allowing the rope 2 to move, the rope 2 is pulled smoothly, the climbing device 100 rises, and the user U suspended from the rope 402 can climb along the outer wall of the building 400.

[0012] When it is desired to stop pulling the rope 2 and stop climbing, the operation of the input shaft 1 by the rechargeable electric screwdriver 600 is stopped. Then, tension is generated in the entrance side rope 2b on which the weight of the user U is applied, and a reverse rotation force is generated in the pulley 3, the reduction gear 5, the input shaft 1, the drive shaft 602, and the rechargeable electric screwdriver 600. The exit side rope 2a fitted in the rope groove 46 of the rope abutment portion 45 is pulled toward the pulley 3 and pulled back slightly, and a counterclockwise external force is applied to the cam 308, but since the outer circumferential portion 307 is in the direction approaching the rope 2, the cam 308 bites into the rope 2 and restricts its movement. Therefore, the movement of the rope 2 stops.

[0013] When it is desired to descend while the entrance rope 2b is pulled upward in Fig. 7, the exit rope 2a is wound around the hooking parts 12 and 13 and hooked, and as shown in Fig. 9, a manual rotating tool 90 having a drive shaft 92 with a key part 91 is connected to the input shaft 1 and rotated forward to loosen the bite of the cam 308 against the rope 2, and the operating protrusion 311 of the limiting means 300 is operated with a finger, and the rotation of the cam 308 and the rotation of the release operating member 310 are performed in parallel, and the engaging part 312 is engaged with the outside of the bent part 305 as shown in Fig. 6. Then, when the gripping force holding the exit rope 2a removed from the hooking parts 12 and 13 is weakened, the pulling force of the entrance rope 2b due to the downward load applied to the ascending device 100 rotates the pulley 3 and the reduction gear 5 in the reverse direction, and the exit rope 2a is pulled back to the entrance side and descends. At this time, the differential reduction type reduction gear 5 allows the vehicle to move slowly.

[0014] Incidentally, when the drive of the rechargeable electric screwdriver 600 is stopped in the middle of pulling the rope, a large pulling force is applied to the rope 2 from the exit side to the entrance side due to the load applied to the ascending device 100, and a large reverse rotation force is generated in the pulley 3, the reduction gear 5, the input shaft 1, and the drive shaft 602 until the cam-type limiting means 300 operates to completely stop the movement of the rope 2. There was a problem that the internal structure of the rechargeable electric screwdriver 600 was damaged by the excessive reverse rotation load applied to the drive shaft 602.

[0015] Therefore, the applicant of the present application invented an improved climbing device that makes it difficult to apply a reverse rotation load even if the drive of the rotary power tool is stopped in the middle of towing the rope 2 (Patent Application No. 2023-075353). This climbing device has an input shaft 1A that can be driven by a rechargeable electric screwdriver 600, an output shaft connected to a pulley 3 around which a rope can be wound, and a differential reduction type speed reduction means 50A that reduces the forward rotation applied to the input shaft 1A and transmits it to the output shaft. The climbing device 100A is equipped with a one-way clutch unit 401 that is attached to the input shaft 1A and allows the input shaft 1A to rotate forward and restricts the reverse rotation, and a rotation constraint / release unit 402 that restricts or releases the rotation of the one-way clutch unit 401 around the axis of the input shaft 1A.

[0016] According to this improved climbing device, when climbing, the rotation of one-way clutch unit 401 equipped on input shaft 1A about the input shaft is constrained, and when input shaft 1A is driven to rotate in the forward direction by the rotary power tool, the rotational force of the rotary power tool is transmitted to the input shaft without constraining the rotation of input shaft 1A by one-way clutch unit 401, and after being decelerated by deceleration means 50A, pulley 3 rotates in the forward direction. As a result, rope 2 moves from the inlet side to the outlet side of the pulley, and the user's body is lifted up together with the climbing device, making it possible to climb along the rope. When the user wishes to stop climbing, the operation of the rotary power tool is stopped. A reverse rotation force is generated in the pulley 3, the reduction gear means 50A, and the input shaft 1A due to tension generated in the entrance side rope on which the user's weight is applied. The one-way clutch unit 401 receives the reverse rotation force of the input shaft 1A and tries to rotate around its own axis, but since its own rotation around the input shaft is restricted, the one-way clutch function works and prevents the reverse rotation of the pulley 3, the reduction gear means 50A, and the input shaft 1A. As a result, the reverse rotation force is not transmitted to the rotary power tool, preventing damage to the tool. When the user wishes to descend, the rotary power tool is removed from the input shaft 1A, and the restriction on rotation around the input shaft of the one-way clutch unit 401 is released. The tension generated in the entrance side rope on which the user's weight is applied causes a reverse rotation force to be transmitted to the input shaft 1A of the speed reduction means 50A via the pulley 3, causing the one-way clutch unit itself to rotate together with the input shaft 1A. As a result, the one-way clutch function does not work, the reverse rotation of the input shaft 1A is not prevented, the pulley 3 and the speed reduction means 50A can rotate in the reverse direction, and the rope 2 moves from the exit side of the pulley to the entrance side, enabling descent.

[0017] Incidentally, when a type of rotary power tool such as an electric screwdriver that can switch between forward and reverse rotation is used, if the input shaft 1A is connected to the input shaft 1A and driven to rotate forward to climb, and then driven to rotate reversely by mistake, the input shaft 1A will overcome the rotation restraining force on the one-way clutch portion 401 and rotate in the reverse direction together with the one-way clutch portion 401, causing the pulley 3 to rotate in the reverse direction. In this case, for example, if the climber is equipped with the restricting means 300, there is a risk that the surface of the rope will be torn by the teeth of the cam. If the rotational constraint force on the one-way clutch portion 401 is strong, when the input shaft 1A is mistakenly driven in the reverse direction, the input shaft 1A will not rotate and the rotary power tool will rotate due to the reaction force, which may injure the hand or hit the face with the rotary power tool. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent No. 6507463 [Patent Document 2] Patent application 2023-075353 Summary of the Invention [Problem to be solved by the invention]

[0019] The present invention has been made in consideration of the above-mentioned problems with the conventional technology, and has an object to provide a drive shaft for a rotary power tool that can be used to switch between forward and reverse rotation, and that prevents the rope from tearing or injury caused by the rotation of the rotary power tool even if the tool is mistakenly driven in reverse after climbing. [Means for solving the problem]

[0020] In the invention described in claim 1, A drive shaft for a rotary power tool that can be connected to an input shaft of a climber, the drive shaft having an input shaft that can be driven by a rotary power tool, an output shaft connected to a pulley around which a rope can be wound, a differential reduction type speed reducing means that reduces the speed of a forward rotation applied to the input shaft and transmits the reduced speed to the output shaft, a one-way clutch unit that is detachably or non-detachably attached to the input shaft and allows the forward rotation of the input shaft and restricts the reverse rotation, and a rotation constraint / release unit that restricts or releases the rotation of the one-way clutch unit around the axis of the input shaft, The drive shaft for rotary power tools is an outer shaft portion that can be attached to a rotary power tool; a cylindrical second one-way clutch portion fixed to the hollow interior of the tip side of the outer shaft portion; an inner shaft portion journalled on the inside of the second one-way clutch portion and provided so as to be rotatable in one direction and have its rotation restricted in the opposite direction; The inner shaft portion is formed so as to be freely connectable to the input shaft of the ascender; It is characterized by: In the invention described in claim 2, The inner shaft portion is cylindrical and has a key groove or key portion formed thereon; It is characterized by: Effect of the Invention

[0021] According to the present invention, a drive shaft for a rotary power tool that can be connected to the input shaft of a climber is provided, the drive shaft having an input shaft that can be driven by a rotary power tool, an output shaft connected to a pulley around which a rope can be wound, a differential reduction type reduction means that reduces the speed of forward rotation applied to the input shaft and transmits it to the output shaft, a one-way clutch section that is detachably or non-detachably attached to the input shaft and allows forward rotation of the input shaft and restricts reverse rotation, and a rotation constraint / release section that constraints or releases the rotation of the one-way clutch section around the axis of the input shaft. The drive shaft for a rotary power tool that can be connected to the input shaft of a climber is provided with an outer shaft section that can be attached to the rotary power tool, The one-way clutch is provided with a cylindrical one-way clutch fixed inside the hollow at the tip side of the outer shaft, and an inner shaft supported inside the one-way clutch and rotatable in one direction but restricted in the opposite direction, the inner shaft is formed so as to be freely connectable to the input shaft of the climber, and when the rotary power tool rotates forward and the drive shaft rotates forward, the one-way clutch transmits the forward rotation force directly to the input shaft via the inner shaft to drive it in the forward direction, and when the rotary power tool rotates reverse and the outer shaft of the drive shaft rotates reverse, the one-way clutch prevents the reverse rotation force from being transmitted to the input shaft. As a result, even if the rotary power tool rotates in the reverse direction by mistake, the outer shaft simply spins freely, and the input shaft of the climber does not rotate in the reverse direction. Therefore, even if the rotary power tool is connected to the input shaft and driven in the forward direction to climb, and then driven in the reverse direction by mistake, the pulley does not rotate in the reverse direction, so that, for example, even if the climber has a limiting means, there is no risk of the surface of the rope being torn by the teeth of the cam. Furthermore, the rotary power tool itself will not rotate due to the reaction force. When the drive shaft for a rotary power tool is attached to or detached from the input shaft of a climber, the one-way clutch portion does not come into direct contact with the input shaft, so that the one-way clutch portion is less likely to be damaged. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a partially omitted external perspective view showing an example of a conventional rope traction device. [Diagram 2] FIG. 2 is a front view of FIG. [Diagram 3] FIG. 2 is a partially omitted front view of FIG. [Figure 4] FIG. 2 is a rear view of FIG. [Diagram 5] FIG. 2 is an explanatory diagram of how to use FIG. [Figure 6] 2 is an explanatory diagram of the operation of the limiting means of FIG. 1; [Figure 7] 2 is an explanatory diagram of the operation of the limiting means of FIG. 1; [Figure 8] FIG. 8(1) is an explanatory diagram of a rechargeable electric screwdriver that drives a rope pulling device, and (2) is a cross-sectional view taken along line AA of (1). [Figure 9] FIG. 9(1) is an explanatory diagram of a manual rotary tool for driving a rope pulling device, and (2) is a cross-sectional view taken along line BB in (1). [Figure 10] FIG. 10 is a rear view of a powered climber for explaining the principle of the present invention. [Figure 11] FIG. 11 is a side view of FIG. 10 with some parts cut away and omitted. [Figure 12] FIG. 11 is a front view of FIG. [Figure 13] 11 is an explanatory diagram of how to use the ascender of FIG. 10. FIG. [Figure 14] 11 is an explanatory diagram of how to use the ascender of FIG. 10. FIG. [Figure 15] 11 is an explanatory diagram of how to use the ascender of FIG. 10. FIG. [Figure 16] FIG. 11 is a rear view of a modified example of the ascender of FIG. [Figure 17] 10 is an explanatory diagram of a method of using a drive shaft for a rotary power tool when a rechargeable electric screwdriver is capable of switching between forward and reverse rotation. FIG. [Figure 18] 1 is a front view of a drive shaft for a rotary power tool according to an embodiment of the present invention; [Figure 19] FIG. 19 is a cross-sectional view of the rotary power tool drive shaft of FIG. 18. [Figure 20] FIG. 19 is an assembly diagram of the rotary power tool drive shaft of FIG. 18. [Figure 21] 19 is an explanatory diagram showing a method of using the rotary power tool drive shaft of FIG. 18. BEST MODE FOR CARRYING OUT THEINVENTION

[0023] The best mode of the present invention will now be described with reference to the following examples. <Principle of the invention>

[0024] First, the principle of the present invention will be described with reference to Figures 10 and 11. Figure 10 is a rear view of a powered climber, and Figure 11 is a side view of Figure 10 with some parts cut away and omitted. 10 and 11, 100A is a powered climbing device, of which 1A is an input shaft of the reduction gear means 50A, and is extended to the outside through a shaft hole 400 drilled in the sealed case 15A. 401 is a one-way clutch unit that is fixed non-detachably to the input shaft 1A and attached to the outer periphery thereof, and allows the input shaft 1A to rotate forward and restricts the input shaft 1A to rotate reversely. The one-way clutch unit 401 may be fixed detachably to the input shaft 1A and attached thereto. Reference numeral 402 denotes a rotation restriction / release unit provided on the rear side of the sealed case 15A, which restricts the rotation of the one-way clutch unit 401 around the axis of the input shaft 1A or releases the rotation restriction. This rotation restriction / release unit 402 restricts the rotation of the one-way clutch unit 401 itself around the axis of the input shaft 1A, thereby allowing the one-way clutch unit 401 to perform its original one-way clutch function, allowing the input shaft 1A to rotate forward and restricting the reverse rotation. Conversely, by releasing the rotation restriction of the one-way clutch unit 401 itself around the axis of the input shaft 1A, when an external force of reverse rotation is applied to the one-way clutch unit 401 through the input shaft 1A, the one-way clutch unit 401 itself rotates together with the input shaft 1A around the axis of the input shaft 1A, preventing the one-way clutch unit 401 from performing its original function and preventing the reverse rotation of the input shaft 1A from being restricted.

[0025] The rotation restriction / release unit 402 can be configured, for example, by a brake mechanism that restricts rotation about the axis of the input shaft 1A by applying a brake to the one-way clutch unit 401, and releases the rotation restriction by releasing the brake. This brake mechanism can be a band brake mechanism, a drum brake mechanism, an electromagnetic brake mechanism, or the like, and in this embodiment, an example configured by a band brake mechanism will be described as an example. Specifically, the rotation constraint / release section 402 is composed of a disk-shaped brake drum section 403 fixedly mounted on the one-way clutch section 401, a brake band section 404 arranged along the outer periphery of the brake drum section 403, a pressing / release section 405 that normally presses and urges the brake band section 404 against the brake drum section 403 and releases the pressure when the rotation constraint is released, and a dish-shaped brake case 406 that is provided on the rear side of the sealed case 15A and supports the brake band section 404 and the pressing / release section 405. The brake case 406 covers and protects the outer periphery of the brake drum section 403 and the brake band section 404. Although the brake case 406 is open axially outward in FIG. 10, the opening may be covered with a lid.

[0026] The brake band portion 404 is made up of a brake band support plate 407 curved in a partial circular ring shape (approximately horseshoe-shaped) with a central angle of nearly 300 degrees along the outer periphery of the brake drum portion 403, and a partial circular ring-shaped (approximately horseshoe-shaped) brake band 408 fixed to the inner periphery of the brake band support plate 407. The brake band 408 is made of a friction member such as a rubber member, and is pressed against the brake drum portion 403 to generate frictional force. One end (fixed end) on the lower right side of the brake band support plate 407 is fixed to the brake case 406 via a pin 409, and the other end on the upper right side is fixed to the base of a lever of the pressure / release portion 405, which will be described later, via a pin 410.

[0027] The pressing / releasing part 405 is provided on the right side of the brake case 406 in FIG. 10. Of the pressing / releasing part 405, 411 is a lever formed in an overall V-shape, and the V-shaped bent corner is rotatably supported by a shaft 412 attached to the brake case 406. The lever 410 has a base 413 that extends short from the shaft 412 in a direction approaching the brake drum part 403, and an operating part 412 for releasing the rotation restriction that extends long in the direction away from the shaft 412. A pin 410 is attached to the base 413, and one end (free end) of the brake band support plate 407 on the upper right side in FIG. 10 is fixed to this pin 410.

[0028] 10 (arrow A), the pin 410 moves to the right, pulling the free end of the brake band support plate 407 to the right, causing the brake band portion 404 to wrap around the brake drum portion 403 and pressing the brake band 408 against the outer periphery of the brake drum portion 404, thereby applying a friction brake. As a result, the one-way clutch portion 401 is restricted from rotating around the axis of the input shaft 1A. 10 (arrow B), the pin 410 moves leftward, returning the free end of the brake band support plate 407 to the left, loosening the winding of the brake band portion 404, and the brake band 408 moves away from the outer periphery of the brake drum portion 403, releasing the pressure and releasing the friction brake. As a result, the one-way clutch portion 401 is released from the restriction on rotation about the axis of the input shaft 1A.

[0029] Two sets of tension springs 415 that constantly urge the lever 411 counterclockwise are interposed between a portion of the base 413 of the lever 411 closer to the brake drum portion 403 as viewed from the shaft 412 and the outer circumferential edge of the brake case 406. When no external force is applied to the operating portion 414, the tension springs 415 cause the lever 411 to rotate counterclockwise, and the brake band 408 is pressed against the outer periphery of the brake drum portion 403, so that the rotation of the one-way clutch portion 401 is restricted. In this state, when the user operates the operating unit 414 in the counterclockwise direction in Figure 10 (pressure release operation = operation to release the rotation constraint on the one-way clutch unit 401), the lever 411 rotates clockwise, the brake band 408 moves away from the outer periphery of the brake drum unit 403, the pressure is released, the friction brake is released, and the rotation constraint on the one-way clutch unit 401 is released.

[0030] Other components of the rope pulling device 100A are configured similarly to the conventional rope pulling device 100 described in Fig. 1 to Fig. 9, but the restricting means 300 is omitted. Also, the outlet side of the separating part 40D is extended in an aquiline shape into the H-groove 31 of the pulley 3, and is formed so that the rope 2 that has bitten into the H-groove 31 can be pulled away from the H-groove 31 (see Fig. 12). Also, there is no opening 140 in the pulley case 14A.

[0031] Next, a method of using the above-mentioned elevator will be described with reference to FIGS. For example, to explain how to load a rope when used for climbing along the exterior wall of a building, one end of the rope 2 is fixed to the parapet 401 on the roof of a building 400 in advance to secure a fulcrum, as shown in Figure 13, and the other end is allowed to hang down to the ground. A user U wearing a ground harness (not shown) first opens the pulley cover 14A (see arrow D in FIG. 11), inserts one end of the rope 2 into the rope insertion groove 20 of the entrance portion 7, passes it through the left side of the separation portion 40D to wind it slightly around the pulley 3 one turn, passes it through the right side of the separation portion 40D to insert it into the rope insertion groove 21 of the exit portion 8 (see FIG. 14), and then winds it around the hook portions 12 and 13 to hook it in place. Then the pulley cover 14 is closed (see arrow E in FIG. 11).

[0032] The user U connects the ascending device 100A attached to himself / herself with the mounting hole 11 of the ascending device 100A using a sling 420 (or a carabiner) (see FIG. 15). Here, when no external force is applied to the operating portion 414 of the lever 411, the tension spring 415 of the pressure / release portion 405 of the rotation restriction / release portion 402 presses the brake band 408 against the brake drum portion 403, generating a friction brake, and the one-way clutch portion 401 is in a rotation restriction state.

[0033] To start climbing by pulling the rope 2, the exit side rope 2a is removed from the winding portions 12, 13, and as shown in FIG. 15, a chuck 601 serving as a drive shaft of a rechargeable electric screwdriver 600 is connected to the input shaft 1A. In this state, when the rechargeable electric screwdriver 600 is operated to rotate in the forward direction, the one-way clutch unit 62, which restricts the rotation of the input shaft 1A around its axis, allows the input shaft 1A to rotate in the forward direction, so the input shaft 1A rotates in the forward direction. The forward rotation of the input shaft 1A is decelerated by the decelerating means 50A to rotate the pulley 3 in the forward direction, pulling the rope 2 from the entrance side to the exit side. As a result, the climbing device 100A rises, and the user U is lifted by the sling 420 (or a carabiner) and can climb along the exterior wall of the building.

[0034] When it is desired to stop pulling the rope 2 and stop climbing, the operation of the rechargeable electric screwdriver 600 is stopped and the drive of the input shaft 1A is stopped. Then, the entrance side rope 2b, on which the weight of the user U is applied, is pulled downward, generating tension, and a pulling force is applied to the rope 2 returning from the exit side to the entrance side of the pulley 3, generating a reverse rotation force in the pulley 3, the deceleration means 50A, and the input shaft 1A. Here, the one-way clutch section 401 tries to rotate itself by restricting the reverse rotation of the input shaft 1A, but because the rotation around the axis of the input shaft 1A is restricted by the rotation restriction / release section 402, the one-way clutch function comes into play and stops the rotation of the pulley 3, the speed reduction means 50A, the input shaft 1A, and the chuck 31. As a result, the reverse rotation force is not transmitted to the rechargeable electric screwdriver 600, preventing it from being damaged.

[0035] Next, the outlet side rope 2a is wound around the winding portions 12, 13 to restrain the movement of the rope 2, and the chuck 601 of the rechargeable electric screwdriver 600 is removed from the input shaft 1A to release the connection between the rechargeable electric screwdriver 600 and the input shaft 1A. The tension generated in the entrance rope 2b under the weight of the user U applies a pulling force from the exit side to the entrance side to the rope 2, and a reverse rotation force is generated in the pulley 3, the speed reducer 50A, and the input shaft 1A, but because the one-way clutch unit 401, which is in a rotation constraint state, restricts the reverse rotation of the input shaft 1A and prevents the reverse rotation of the pulley 3, and because the exit rope 2a is wound around the winding parts 12 and 13, even if the entrance rope 2b is released, the rope 2 does not move and the pulley 3 does not rotate. In this state, the user U can carry out the desired work on the exterior wall of the building.

[0036] After that, when the user wants to climb further upward, the chuck 601 of the rechargeable electric screwdriver 600 is connected to the input shaft 1A as described above. Then, the exit side rope 2a is removed from the winding parts 12 and 13. In this state, when the rechargeable electric screwdriver 600 is operated and driven to rotate in the forward direction, the one-way clutch part 401 allows the input shaft 1A to rotate in the forward direction, so that the chuck 601 of the rechargeable electric screwdriver 600 rotates in the forward direction and rotates the input shaft 1A in the forward direction. The forward rotation of the input shaft 1A is decelerated by the deceleration means 50A to rotate the pulley 3 in the forward direction, and the rope 2 is pulled from the entrance side to the exit side. As a result, the climbing device 100A rises, and the user U is lifted by the sling 420 (or a carabiner) and can climb along the exterior wall of the building.

[0037] Conversely, when it is desired to descend from a stopped state, the rechargeable electric screwdriver 600 is removed from the input shaft 1A of the climbing device 100A, the exit rope 2a wound around the rope winding parts 12, 13 is removed, and the entrance rope 2b is grasped with the right hand to free the movement of the rope 2 wound around the pulley 3. Since the weight of the user U is applied to the climbing device 100A via the sling 420, tension is applied to the entrance rope 2b, and the pulley 3 tries to rotate in the reverse direction, but since the one-way clutch part 62, which is in a rotation-constrained state around the axis of the input shaft 1A, restricts the reverse rotation of the input shaft 1A, the pulley 3 does not rotate in the reverse direction and the rope 2 does not move yet.

[0038] 10 (in the direction of arrow B) against the tensile force of tension spring 415, thereby releasing the rotation restriction of one-way clutch portion 401. Then, base portion 411 of lever 411 rotates clockwise, brake band 408 separates from the outer periphery of brake drum portion 403, the pressure is released, the friction brake is released, and the rotation restriction around input shaft 1A of one-way clutch portion 402 is released. As a result, the one-way clutch unit 401 rotates in the reverse direction together with the input shaft 1A in response to the reverse rotational force applied to the input shaft 1A, the pulley 3 rotates in the reverse direction, and the exit rope 2a moves so as to return to the entrance side, allowing the user to descend together with the climbing device 100A. At this time, the differential deceleration type deceleration means 50A can perform a slow movement.

[0039] When it is desired to stop the descent, the operation part 414 of the lever 411 is released from being pressed down, and the outlet rope 2a is wound around the rope hook parts 12, 13. The lever 411 is biased by the tension spring 415 to rotate counterclockwise in Fig. 10, and the brake band 408 is pressed against the outer periphery of the brake drum part 403, applying a friction brake and restricting the rotation of the one-way clutch part 401 about the axis of the input shaft 1A. Therefore, the one-way clutch part 401 again restricts the reverse rotation of the input shaft 1A, and the reverse rotation of the pulley 3 is prevented, thereby stopping the descent.

[0040] 10, when the input shaft 1A is driven to rotate in the forward direction by a rechargeable electric screwdriver 600 as an example of a rotary power tool while the rotation of the one-way clutch unit 401 fitted onto the input shaft 1A is restricted by the rotation restriction / release unit 402, the rotation force of the rechargeable electric screwdriver 600 is transmitted to the input shaft 1A without the one-way clutch unit 401 restricting the rotation of the input shaft, and after being decelerated by the deceleration means 50A, the pulley 3 rotates in the forward direction. As a result, the rope 2 is pulled and moved from the entrance side to the exit side of the pulley, lifting the user's body and allowing the user to ascend. When the user wishes to stop climbing, the operation of the rechargeable electric screwdriver 600 is stopped. Then, due to the tension generated in the entrance side rope 2b on which the user's weight is applied, a reverse rotation force is generated in the pulley 3, the speed reducer 50A, and the input shaft 1A. The one-way clutch unit 401 receives the reverse rotation force of the input shaft 1A and tries to rotate itself around the axis of the input shaft 1A, but since the rotation around its own input shaft is restricted, the one-way clutch function works and the reverse rotation of the pulley 3, the speed reducer 50A, and the input shaft 1A is prevented. As a result, the reverse rotation force is not transmitted to the rechargeable electric screwdriver 600, and damage can be prevented. When descending, the rechargeable electric screwdriver 600 is removed from the input shaft 1A, and the operation part 414 of the lever 411 is pushed down in the clockwise direction in FIG. 10 to perform the release operation, and the rotation restriction state of the one-way clutch part 401 by the rotation restriction / release part 402 is released. Then, due to the tension generated in the entrance side rope 2b on which the user's weight is applied, the one-way clutch part 401 itself rotates together with the input shaft 1A due to the reverse rotation force transmitted to the input shaft 1A of the speed reduction means 50A via the pulley 3. As a result, the one-way clutch function does not work, the reverse rotation of the input shaft 1A is not prevented, the pulley 3 and the speed reduction means 50A can rotate in the reverse direction, and the rope 2 moves from the exit side to the entrance side of the pulley 3, enabling descent.

[0041] In the above-mentioned climbing device, the operating part 414 of the lever 411 is pressed and released by hand, but as shown in Fig. 16, the pressing / releasing part 4050 may be provided on the upper part of the brake case 4060, and the operating part 4140 of the lever 4110, which has been rotated and returned by the tension spring 415, may be arranged to come above the support 6, and the rope 2a on the exit side of the rope 2 may be grasped and hooked on the operating part 4140 and pushed downward to perform the pressing and releasing operation when the pulley 3 rotates in the reverse direction. In the case of the example of Fig. 16, when it is desired to descend, the exit rope 2a of the pulley 3 is held with the left hand, and the exit rope 2a is hooked on the operating part 4140 and pushed downward to perform the pressing and releasing operation, and the user may descend by grasping the entrance rope 2b with one hand and the exit rope 2a with the other.

[0042] In addition, the rope pulling device is of a type that omits the limiting means 300 of the conventional rope pulling device 100 described in Figs. 1 to 9, but may be of a type that provides the limiting means 300 described in Figs. 1 to 9 on the front surface of the support 6 (the separating portion and pulley cover are of the type indicated by symbols 40 and 14). By providing the limiting means 300, the cam 308 of the limiting means 300 can be caused to bite into the rope 2 to limit the movement of the rope 2 after the rotary power tool is stopped and removed from the input shaft in order to stop the tool from climbing. Also, when the one-way clutch part 401 is broken before the rotary power tool is removed from the input shaft 1A when the rotary power tool is stopped, the cam 308 of the limiting means 300 can be caused to bite into the rope 2 to limit the movement of the rope 2, so that the tool does not descend unintentionally.

[0043] In this case, if a rotary power tool capable of switching between forward and reverse rotation is used, and then the input shaft is connected to the input shaft and driven in forward rotation to ascend, the input shaft will overcome the frictional force of the brake band and rotate in reverse together with the one-way clutch and brake drum, causing the pulley to rotate in reverse. If this occurs, for example, if the ascender is equipped with the limiting means 300, the surface of the rope may be torn by the teeth of the cam. If the frictional force of the brake band is strong, accidentally driving the tool in the reverse direction will not rotate the input shaft, but will cause the rotary power tool to rotate due to the reaction force, which could injure the hand or cause the rotary power tool to hit the face. As a countermeasure to this problem, the input shaft of the climber can be driven by a drive shaft for a rotary power tool (a tip tool, hereafter abbreviated as "drive shaft") that is removably attached to the rotary power tool, a second one-way clutch unit can be attached to the drive shaft, and the input shaft can be driven via this second one-way clutch unit.

[0044] Specifically, as shown in Fig. 17, a drive shaft 610 is prepared that can be attached and detached to a chuck portion 601 of a rechargeable electric screwdriver 600. The drive shaft 610 has a stepped structure in which a small diameter portion 611 and a large diameter portion 612 are integrated in the axial direction, and the small diameter portion 611 is detachably attached to the chuck portion 601. A cylindrical second one-way clutch portion 613 is attached to the hollow interior of the large diameter portion 612. The second one-way clutch portion 613 can be detachably fitted to the outer periphery of the tip portion 1b of the input shaft 1A of the ascender, and by fitting the second one-way clutch portion 613 to the tip portion 1b, the drive shaft 610 attached to the chuck portion 601 of the rechargeable electric screwdriver 600 can be connected to the input shaft 1A. The second one-way clutch 613 has the function of transmitting the forward rotation force directly to the input shaft 1A to drive it in the forward direction when the rechargeable electric screwdriver 600 rotates forward and the drive shaft 610 rotates forward, and conversely, preventing the reverse rotation force from being transmitted to the input shaft 1A when the rechargeable electric screwdriver 600 rotates reverse and the drive shaft 610 rotates reverse. As a result, even if the rechargeable electric screwdriver 600 accidentally rotates reversely, the drive shaft 610 will simply spin freely, but the input shaft 1A, reduction gear means 50A, and pulley 3 will not rotate reversely. Therefore, even if the pulley 3 is mistakenly rotated in the reverse direction after being connected to the input shaft and driven in the forward direction to climb, the pulley 3 will not rotate in the reverse direction, so there is no risk of the surface of the rope being torn by the cam teeth, even if the climbing device is equipped with the limiting means 300. In addition, since the rotary power tool itself does not rotate, there is no risk of the rotary power tool injuring the hands or hitting the face. <Example 1>

[0045] Here, when the drive shaft 610 in FIG. 17 is attached to or detached from the input shaft 1A, the second one-way clutch portion 613 comes into direct contact with the input shaft 1A, and therefore the second one-way clutch portion 613 is easily damaged. 18 and 19 show a drive shaft for a rotary power tool (tool tip, hereinafter referred to as a "drive shaft") according to one embodiment of the present invention. The drive shaft 710 in Fig. 18 and Fig. 19 is an improvement of the drive shaft 610 in Fig. 17. The drive shaft 710 in Fig. 18 is composed of a stepped outer shaft portion 715 in which a small diameter portion 711 and a large diameter portion 712 are integrated in the axial direction, a cylindrical second one-way clutch portion 713 fixed by press-fitting into a hollow interior 716 of the large diameter portion 712, and a cylindrical inner shaft portion 717 journaled in the second one-way clutch portion 713 so as to be rotatable in one direction. The small diameter portion 711 can be detachably attached to the chuck portion 601 of the electric screwdriver 600 of the rotary power tool. A key groove portion 718 extending in the axial direction is formed at one circumferential position on the inner surface side of the inner shaft portion 717.

[0046] 20 is an assembly diagram of the drive shaft 710, in which the inner shaft portion 717 is passed through the inside of the second one-way clutch portion 713, and a snap ring 719 is fitted to the inner shaft portion 717 so as to sandwich both sides of the second one-way clutch portion 713, thereby preventing axial movement relative to the second one-way clutch portion 713 (FIGS. 20(1) and (2)). Rotation of the inner shaft portion 717 relative to the second one-way clutch portion 713 is restricted in one direction, but rotation in the other direction is not restricted. Here, the restricted direction is the counterclockwise direction, when looking from the small diameter portion 711 to the large diameter portion 712, which rotates the input shaft 1A in the reverse direction, and the unrestricted direction is the clockwise direction, which rotates forward. The second one-way clutch portion 713 with the inner shaft portion 717 is axially press-fitted into the hollow interior 716 of the large diameter portion 712 of the outer shaft portion 715 and fixed thereto so as to be non-rotatable (Figure 20(3)). When the drive shaft 710 is used, the elevator is of a type in which a key portion 1C corresponding to the key groove portion 718 of the inner shaft portion 717 is formed on the tip portion 1b of the input shaft 1A, as shown in Figure 21.

[0047] Next, a method of using the drive shaft 710 will be described with reference to FIG. Before starting to climb, the small diameter portion 711 of the drive shaft 710 is attached to the chuck portion 601 of the rechargeable electric screwdriver 600. Then, the key portion 1C is matched with the key groove portion 718, and the tip portion 1b of the input shaft 1A is inserted and fitted into the inner shaft portion 71, thereby connecting the drive shaft 710 attached to the chuck portion 601 of the rechargeable electric screwdriver 600 to the input shaft 1A. At this time, since the input shaft 1A does not directly contact the second one-way clutch portion 713, damage to the second one-way clutch portion 713 can be prevented.

[0048] When starting to climb, the rechargeable electric screwdriver 600 is rotated forward. Then, the outer shaft portion 715 of the drive shaft 710 and the second one-way clutch portion 713 rotate forward integrally, and the inner shaft portion 717, whose reverse rotation relative to the second one-way clutch portion 713 is restricted, also rotates forward. Therefore, the input shaft 1A is driven to rotate forward, and the pulley 3 rotates forward via the reduction gear device, allowing the user to ascend along the entrance side rope 2b.

[0049] If the rechargeable electric screwdriver 600 is accidentally operated in reverse while climbing, causing the drive shaft 710 to rotate in reverse, the outer shaft portion 715 of the drive shaft 710 and the second one-way clutch portion 713 will rotate in reverse together. However, since the forward rotation of the inner shaft portion 717 relative to the second one-way clutch portion 713 is not restricted, the input shaft 1A and the inner shaft portion 717 will remain stopped, and only the second one-way clutch portion 713 and the outer shaft portion 715 will rotate idly. As a result, it has a function of preventing the transmission of reverse rotation force to the input shaft 1A. This makes it possible to prevent the input shaft 1A, the reduction means 50A, and the pulley 3 from rotating in reverse even if the rechargeable electric screwdriver 600 rotates in reverse by mistake.

[0050] According to this embodiment, the input shaft 1A of the climber is driven by a rotary power tool drive shaft 710 which is detachably attached to the rotary power tool, a second one-way clutch portion 713 is attached to the drive shaft 710, and the input shaft 1A is driven via this second one-way clutch portion 713. When the rechargeable electric screwdriver 600 rotates forward and the outer shaft portion 715 of the drive shaft 710 rotates forward, the second one-way clutch portion 713 transmits the forward rotational force directly to the input shaft 1A via the inner shaft portion 717 to drive it in the forward rotation, and conversely, when the rechargeable electric screwdriver 600 rotates reverse and the outer shaft portion 715 of the drive shaft 710 rotates reverse, the second one-way clutch portion 713 has the function of preventing the reverse rotational force from being transmitted to the input shaft 1A. As a result, even if the rechargeable electric screwdriver 600 rotates in the reverse direction by mistake, the outer shaft portion 715 of the drive shaft 710 will simply spin freely, but the input shaft 1A, the speed reducing means 50A, and the pulley 3 will not rotate in the reverse direction. Therefore, even if the rechargeable electric screwdriver 600 is connected to the input shaft 1A and driven in the forward direction to climb, and then accidentally driven in the reverse direction, the pulley 3 will not rotate in the reverse direction, so there is no risk of the surface of the rope being torn by the teeth of the cam, even if the climbing device is equipped with the limiting means 300. In addition, the rechargeable electric screwdriver itself will not rotate due to a reaction force, so there is no risk of the hand being injured or the rechargeable electric screwdriver hitting the face. Furthermore, when the drive shaft 710 is attached to or detached from the input shaft 1A of the climber, the second one-way clutch portion 713 does not come into direct contact with the input shaft 1A, so that the second one-way clutch portion 713 can be prevented from being damaged.

[0051] In the above embodiment, the inner shaft portion is cylindrical and has a key groove on the inner diameter side, but a key portion may be provided on the inner diameter side. Also, the inner shaft portion may be rod-shaped instead of cylindrical. [Industrial Applicability]

[0052] The present invention is applicable to an ascender or rope traction device that ascends a person by pulling a rope. [Explanation of symbols]

[0053] 100A climber 1A input shaft 2. Rope 3 Pulley 6 Support 50A deceleration means 402 Rotation restriction / release section 600 Rechargeable Electric Screwdriver 601 Chuck 710 Drive shaft for rotary power tools 713 Second one-way clutch part 715 Outer shaft section 717 Inner shaft part

Claims

1. A drive shaft for a rotary power tool that can be connected to an input shaft of a climbing device, the drive shaft having an input shaft that can be driven by a rotary power tool, an output shaft connected to a pulley around which a rope can be wound, a differential reduction type speed reduction means that reduces the speed of forward rotation applied to the input shaft and transmits it to the output shaft, a one-way clutch unit that is detachably or non-detachably attached to the input shaft and allows forward rotation of the input shaft and restricts reverse rotation, and a rotation constraint / release unit that constraints or releases the rotation of the one-way clutch unit around the axis of the input shaft, The drive shaft for rotary power tools is an outer shaft portion that can be attached to a rotary power tool; a cylindrical second one-way clutch portion fixed to a hollow interior portion on a tip side of the outer shaft portion; an inner shaft portion that is journaled on the inside of the second one-way clutch portion and is provided so as to be rotatable in one direction and have its rotation restricted in the opposite direction; The inner shaft portion is formed so as to be freely connectable to the input shaft of the ascender; A drive shaft for a rotary power tool, comprising:

2. The inner shaft portion is cylindrical and has a key groove or key portion formed thereon; 2. The drive shaft for a rotary power tool according to claim 1 .

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