Rope grabbing device

Abstract

A shell is provided with a rope seat part and a box part, the rope seat part is provided with a rope groove, the box part is in pivot joint with a cam part, the cam part can be matched with the rope groove to clamp a rope body arranged in the rope groove in a penetrating mode, the box part is provided with a limiting part capable of moving forwards and backwards towards the rope seat part, and the limiting part is provided with a limiting wheel used for guiding the rope body. The box part is pivoted with a locking piece which can be reset after being rotated, and the locking piece is provided with a first arm and a second arm; a linkage piece capable of swinging in a pivoted mode is connected to the box part in a pivoted mode, the linkage piece is provided with an abutting end, and the linkage piece can selectively abut against the cam piece through the abutting end to limit the cam to the position where the rope body is clamped or swing to the position where the second arm is shifted in a pivoted mode, so that the first arm is rotated away from the position where the limiting piece is limited; when the rope limiting device is arranged on a rope body, a user can conveniently place the rope body into a rope groove in a mode of moving and retreating the limiting piece, and after the limiting wheel abuts against the rope body, the position of the limiting piece is fixed through the locking piece, so that the rope body which is arranged in the rope groove in a penetrating mode is prevented from being accidentally disengaged outwards from the rope groove.

Description

TECHNICAL FIELD

[0001] The present invention relates to a safety device; in particular, it relates to a rope grab for fixing a rope. BACKGROUND

[0002] The conventional rope grab is used in combination with a safety belt. The housing of the rope grab has a rope insertion opening, a rope slot is arranged on one side of the housing corresponding to the rope insertion opening, a cam is pivotally arranged on the other side of the housing corresponding to the rope insertion opening, and a limiting wheel is fixedly arranged on the other side of the housing corresponding to the rope insertion opening. When the rope grab is used, the rope is inserted into the rope slot through the rope insertion opening. The cam cooperates with the wall surface of the rope slot to one-way clamp the rope, and the limiting wheel contacts the rope to guide the rope to slide along the rope slot.

[0003] The safety belt of a user can be fixed to the rope through the conventional rope grab, and the rope grab can one-way move along the rope to provide the effect of protecting the user. However, since the limiting wheel of the conventional rope grab is fixedly arranged on the housing and extends into the rope insertion opening, the limiting wheel inevitably hinders the rope from being inserted into the rope slot through the rope insertion opening, and the rope grab cannot be quickly arranged on the rope. SUMMARY

[0004] Therefore, the purpose of the present invention is to provide a rope grab having a limiting wheel which can move forward and backward in the direction of a rope insertion opening, and a safety device which cooperates with the limiting wheel to avoid the limiting wheel from being unexpectedly retracted, so as to achieve the effect that the rope grab can be quickly arranged on the rope.

[0005] In order to achieve the above purpose, the present invention provides a rope grab, which comprises a housing, a cam member, a limiting member, a locking member, and a connecting member. The housing has a rope seat portion and a box portion. The rope seat portion has a rope slot for inserting a rope, and the rope slot penetrates through the opposite sides of the housing and has a wall surface. The cam member is pivotally connected to the box portion and can pivotally swing between a first position and a second position. The cam member has a cam portion. When the cam member is located at the first position, the cam portion cooperates with the wall surface to clamp the rope. The limiting member is arranged on the box portion and can move between a third position and a fourth position. The limiting member has a limiting wheel. When the limiting member is located at the third position, the limiting wheel is closer to the rope slot than when the limiting member is located at the fourth position, thereby limiting the rope in the rope slot.

[0006] The locking member is pivoted to the case and can be pivoted between a fifth position and a sixth position, the locking member has a first arm and a second arm, when the locking member is in the fifth position, the first arm limits the limiting member from moving from the third position to the fourth position; a locking member spring is combined between the locking member and the case to reset the locking member to the fifth position. The connecting member is pivoted to the case and can be pivoted between a seventh position and an eighth position, the connecting member has a top end and a safety belt combined part; when the connecting member is in the fifth position, the top end abuts against the cam member to limit the cam member in the first position; when the connecting member is in the sixth position, the second arm is pushed to make the first arm pivot from the position of limiting the limiting member to the sixth position.

[0007] When the present application is used, the safety belt combined part of the connecting member can be used to fix the safety belt on the user, when the rope that is used to climb trees or is hung on the support is inserted into the rope groove of the shell, the rope is limited between the wall surface and the limiting wheel, the rope can be clamped and fixed by the cam member cooperating with the wall surface, and the rope groove can slide in one direction along the rope groove; during the sliding of the rope along the rope groove, the rope can more smoothly slide along the rope groove under the guidance of the rotatable limiting wheel.

[0008] The effect of the present application is that the limiting member is limited by the locking member and cannot be randomly retracted to the fourth position, so that when the rope is limited between the wall surface of the rope groove and the limiting wheel and is guided by the limiting wheel, the rope cannot be separated from the limiting wheel and cannot be limited by the limiting wheel, thereby avoiding the accidental separation of the rope from the rope groove. When the shell of the present application is arranged on the rope, the first arm of the locking member can be pivoted from the position of limiting the limiting member to the sixth position by rotating the connecting member to the eighth position, at this time, the limiting member can be moved to the fourth position, thereby avoiding the limiting wheel from hindering the rope from entering the rope groove between the rope seat part and the case, so that the rope grabber can be quickly arranged on the rope. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a perspective view of a preferred embodiment of the present application.

[0010] Figure 2 It is an exploded view of the above-mentioned preferred embodiment of the present application.

[0011] Figure 3 It is a front view of the above-mentioned preferred embodiment of the present application.

[0012] Figure 4 It is a 4-4 direction sectional view of the above-mentioned preferred embodiment of the present application. Figure 3

[0013] ​Figure 5 is a top view of the preferred embodiment of the present application.

[0014] Figure 6 is a 6-6 direction sectional view of the preferred embodiment of the present application. Figure 5

[0015] Figure 7 is a front view of the preferred embodiment of the present application with the cover plate removed.

[0016] Figure 8 is a 6-6 direction sectional view of the preferred embodiment of the present application. Figure 7 is a schematic diagram of the action of the link moving to the eighth position, the cam moving to the second position, the locking member moving to the sixth position, and the limiting member moving to the fourth position.

[0017] Figure 9 is a schematic diagram of the action of the preferred embodiment of the present application after being adjusted to the Figure 8 state for being set on a rope.

[0018] Figure 10 is a schematic diagram of the action of the preferred embodiment of the present application after being placed upside down.

[0019] BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 100: rope grabber

[0021] 10: housing

[0022] 12: base plate

[0023] 121: rope placing notch

[0024] 14: rope seat portion

[0025] 141: rope groove

[0026] 142: wall surface

[0027] 143: outlet

[0028] 144: inlet

[0029] 16: cartridge portion

[0030] 161: bottom plate

[0031] 1611: track

[0032] 1612: locking member pivot joint seat

[0033] 1613: spring seat

[0034] 1614: link pivot joint seat

[0035] 1615: cam pivot joint seat

[0036] 162: side wall​

[0037] 1621: linkage perforation

[0038] 163: cover plate

[0039] 1631: button perforation

[0040] 1632: first section

[0041] 1633: second section

[0042] 18: closure seat

[0043] 181: side plate

[0044] 182: inclined hole

[0045] 19: closure

[0046] 191: guide rod

[0047] 20: cam member

[0048] 22: cam member pivot portion

[0049] 24: cam portion

[0050] 241: pawl

[0051] 242: abutment surface

[0052] 26: cam member spring

[0053] 30: limiting member

[0054] 32: slider

[0055] 321: limiting wheel seat

[0056] 322: stop portion

[0057] 323: limiting wheel

[0058] 324: button slot

[0059] 325: limiting member spring slot

[0060] 326: closed end

[0061] 327: limiting member spring

[0062] 34: button

[0063] 341: button spring

[0064] 342: neck portion

[0065] 40: locking member

[0066] 42: pivot hole

[0067] 44: first arm

[0068] 46: second arm

[0069] 48: lock spring

[0070] 50: link

[0071] 52: abutting rod

[0072] 521: abutting end

[0073] 54: link pivot

[0074] 56: handle

[0075] 561: safety belt coupling

[0076] 58: link spring

[0077] A: rope placement opening

[0078] B: rope body

[0079] G: center of gravity

[0080] L: rope passing shaft

[0081] L1: first direction

[0082] L2: second direction

[0083] L3: rotation direction

[0084] S: assembly space DETAILED DESCRIPTION

[0085] In order to make the present application more clearly understood, a preferred embodiment is described in detail below with reference to the accompanying drawings. Please refer to Figures 1 to 6 Fig. 1, which shows a rope grabber 100 according to a preferred embodiment of the present application, which includes a housing 10 and a cam 20, a limiting member 30, a lock 40, and a link 50 coupled to the housing 10, respectively, wherein:

[0086] Please refer to Figures 1 to 3As shown, the housing 10 has a base plate 12, two opposite sides of the base plate 12 are connected with a rope seat part 14 and a box part 16 respectively, a rope placing opening A is formed between the base plate 12, the rope seat part 14 and the box part 16. The rope seat part 14 has a rope groove 141, the rope groove 141 is a U-shaped groove and extends through the opposite sides of the housing 10 along a rope passing axis L, the rope groove 141 is communicated with the rope placing opening A and has a wall surface 142, the rope groove 141 has an outlet 143 and an inlet 144 at two opposite ends along the rope passing axis L; the rope groove 141 is used for placing a rope, the rope surface abuts against the wall surface 142 and passes through the outlet 143 and the inlet 144, the above-mentioned rope passing axis L is a central axis of the rope in a straight line state when the rope is placed in the rope groove 141. The rope passing axis L corresponding to the opposite directions of the outlet 143 and the inlet 144 is defined as a first direction L1 and a second direction L2.

[0087] The rope seat part 14 is connected with a closure seat 18 at an end corresponding to the inlet 144, the closure seat 18 has two opposite side plates 181, a pair of inclined holes 182 is formed opposite to the two side plates 181, the two inclined holes 182 are closer to the inlet 144 at a side closer to the box part 16, and the two inclined holes 182 are farther away from the inlet 144 at a side away from the box part 16. A closure 19 is arranged in the closure seat 18, the closure 19 is a groove wheel and a guide rod 191 is arranged at the axis position, two ends of the guide rod 191 are arranged in the two inclined holes 182, so that the closure 19 can be dragged by gravity to move along the two inclined holes 182 to a position of closing or opening the inlet 144; a part of the base plate 12 adjacent to the rope seat part 14 has a rope placing recess 121, the rope placing recess 121 is communicated with the rope placing opening A.

[0088] The box part 16 is opposite to the rope seat part 14 through the rope placing opening A, the box part 16 has a bottom plate 161, the bottom plate 161 is connected with the base plate 12, a side wall 162 is connected at the edge of the box part 16, a cover plate 163 is combined with the side wall 162, an assembly space S is formed between the bottom plate 161, the side wall 162 and the cover plate 163, the assembly space S is communicated with the rope placing opening A. The bottom plate 161 has a track 1611 and a locking member pivot connection seat 1612 at a side corresponding to the first direction L1, the track 1611 is a straight line track and the extending direction is perpendicular to the rope passing axis L, a spring seat 1613 is arranged at an end of the track 1611 away from the rope seat part 14, the track 1611 is closer to the rope seat part 14 than the locking member pivot connection seat 1612, in the preferred embodiment, the locking member pivot connection seat 1612 is a shaft rod.

[0089] The bottom plate 161 has a linkage pivot seat 1614 on the side corresponding to the second direction L2, and has a cam pivot seat 1615 in the middle, which is between the track 1611 and the linkage pivot seat 1614. The sidewall 162 has a linkage hole 1621 on the side facing away from the rope seat portion 14. The cover plate 163 has a button hole 1631 on the position corresponding to the track 1611, which is an elongated hole extending in the direction perpendicular to the rope insertion axis L. The button hole 1631 has a first section 1632 and a second section 1633 on the opposite sides. The first section 1632 is closer to the rope seat portion 14 than the second section 1633, and the width of the second section 1633 on the opposite sides corresponding to the first direction L1 and the second direction L2 is smaller than that of the first section 1632.

[0090] Please refer to Figures 2 to 6 The cam 20 is arranged in the assembly space S and has a cam pivot portion 22, one side of which is connected to a cam portion 24. Please further refer to Figure 8 The cam 20 has a center of gravity G on the cam portion 24. The cam 20 is pivoted to the cam pivot seat 1615 of the cartridge portion 16 via the cam pivot portion 22, and can be pivoted between a first position and a second position. The state of the cam 20 in the first position is shown in Figure 6 The state of the cam 20 in the second position is shown in Figure 8 When the cam 20 is in the second position, the center of gravity G is on the side of the cam pivot portion 22 closer to the rope seat portion 14 in the second direction L2. When the cam 20 is in the first position, the part of the cam portion 24 extending into the rope insertion opening A is larger than that when the cam 20 is in the second position. The shortest distance between the cam portion 24 and the deepest part of the wall surface 142 is smaller than the diameter of the rope. Therefore, when the cam portion 24 of the cam 20 is in the first position, it can be clamped together with the wall surface 142 to hold the rope inserted into the rope groove 141.

[0091] A cam spring 26 is combined between the cam 20 and the bottom plate 161 of the cartridge portion 16. The cam spring 26 applies a biasing force to the cam 20, which tends to pivot the cam 20 in the direction of the first position. The influence of the biasing force on the pivoting movement of the cam 20 is smaller than that of gravity. Figure 3 and Figure 6As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figure 3 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figures 7 to 8 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown

[0092] As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figure 3 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figures 6 to 8 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown

[0093] As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figures 1 to 3 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figure 6 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figure 3 As shown, the cam member 20 is moved from the second position to the first position along a rotation direction L3, the outer side surface of the cam portion 24 is concave and has a plurality of pawls 241, as shown Figure 8The slider 32 has a button slot 324 on one side facing the cover plate 163, and a limit spring slot 325 on the other side facing the track 1611. The limit spring slot 325 has a closed end 326, and a limit spring 327 is arranged in the limit spring slot 325. The opposite ends of the limit spring 327 abut against the closed end 326 and the spring seat 1613 respectively, and push the limit member 30 to the third position.

[0094] When the limit member 30 is in the third position, the limit wheel 323 is closer to the rope slot 141 than when the limit member 30 is in the fourth position. The limit wheel 323 is used to limit the rope in the rope slot 141. The limit wheel 323 and the wall 142 of the rope slot 141 can cooperate to limit the rope in the rope slot 141, so that the rope cannot escape from the rope slot 141. Furthermore, since the limit wheel 323 is a groove wheel and contacts the rope, the limit wheel 323 that contacts the rope and can rotate can be used to guide the rope to slide in the rope slot 141. Specifically, when the limit member 30 moves from the fourth position to the third position, the limit wheel 323 extends from the box 16 towards the outlet 143, so that the limit wheel 323 extends into the rope insertion opening A and contacts the rope, and limits the rope in the rope slot 141.

[0095] Continuing to refer to Figures 1 to 3 With Figure 6 As shown, the button 34 is in the shape of a cover, and the inner part is accommodated in the button slot 324. The inner end of the button 34 is limited in the button slot 324. A button spring 341 is arranged in the button slot 324, and is used to abut against the button 34, so that the button 34 extends out of the first section 1632 of the button hole 1631. The contour of the button 34 around the first section 1632 is consistent with the size of the first section 1632. The button 34 has a neck 342 around it, and the neck 342 is offset from the edge of the second section 1633 in the direction in which the button 34 extends out of the first section 1632. The width of the neck 342 on the opposite sides of the first direction L1 and the second direction L2 is smaller than the width of the edge of the second section 1633 on the opposite sides of the first direction L1 and the second direction L2. Through the above design, when the limit member 30 is in the third position, the button 34 that protrudes out of the first section 1632 is limited in the position of the first section 1632 and cannot move. Only when the user presses the button 34, and the neck 342 is aligned with the edge of the second section 1633 in the direction in which the button 34 extends out of the first section 1632 due to the rear movement of the button 34, can the limit member 30 be moved to the fourth position.

[0096] Please see Figures 2 to 3 and Figure 6 As shown, the locking member 40 is disposed in the assembly space S and has a pivot hole 42 in the middle, and is surrounded by a first arm 44 and a second arm 46. The locking member 40 is fitted into the locking member pivot seat 1612 of the box portion 16 via the pivot hole 42 and can pivot between a fifth position and a sixth position; the state of the locking member 40 in the fifth position is shown in FIG. Figure 6 As shown, the state where the locking member 40 is located at the sixth position is as shown in FIG. Figure 8 As shown. A locking spring 48 is coupled between the locking member 40 and the bottom plate 161 of the box portion 16. When the locking member 40 rotates away from the fifth position, the locking spring 48 is used to return the locking member 40 to its original position. The first arm 44 of the locking member 40 points to the stopper 322 of the slider 32 along the extension direction of the track 1611, and the second arm 46 extends in the second direction L2; therefore, as shown in FIG. Figure 6 and Figure 7 As shown, when the locking member 40 is located at the fifth position, the first arm 44 restricts the restriction member 30 from moving from the third position to the fourth position.

[0097] Please see Figures 1 to 3 and Figure 6 As shown, the link 50 is a long rod having a push rod 52, a link pivot portion 54, and a handle 56 connected in sequence. The push rod 52 and the link pivot portion 54 of the link 50 extend into the assembly space S. The push rod 52 has an abutting tip 521 at one end facing the rope seat 14, and the handle 56 has a safety belt coupling portion 561 at one end facing away from the rope seat 14. In this preferred embodiment, the safety belt coupling portion 561 is a rope threading hole. The link 50 is pivotally connected to the link pivot seat 1614 of the box portion 16 via the link pivot portion 54 and can pivot between a seventh position and an eighth position. The handle 56 extends outward from the link through hole 1621 of the box portion 16, so that the safety belt coupling portion 561 is located outside the box portion 16 for coupling with a safety belt. A linking spring 58 is coupled between the linking member pivot portion 54 and the bottom plate 161 of the box portion 16 . When the linking member 50 rotates away from the seventh position, the linking spring 58 is used to restore the linking member 50 to its original position at the seventh position.

[0098] like Figure 6 As shown, when the linkage member 50 is located at the seventh position, the abutting top 521 abuts against the abutting surface 242 of the cam member 20, thereby limiting the cam member 20 to the first position. Figure 8As shown, when the linkage 50 is in the eighth position, the handle 56 is used to move the second arm 46 of the locking member 40, causing the locking member 40 to rotate clockwise and drive the first arm 44 to pivot from the fifth position toward the sixth position, causing the first arm 44 to move from the fifth position, where it restricts the restricting member 30, to the sixth position, where it does not restrict the restricting member 30. Therefore, the locking member 40 releases the restricting member 30, and the user can then press the button 34 to move the restricting member 30 to the fourth position, causing the restricting wheel 323 to move into the box portion 16. Figure 8 and Figure 9 As shown, by the way that the limiting wheel 323 no longer extends into the rope placement opening A, it is prevented that the limiting wheel 323 hinders the rope body from moving from the rope placement opening A to the rope groove 141 of the rope seat portion 14.

[0099] When the rope grab 100 of the present invention needs to be installed on the rope body, please refer to Figure 1 and Figures 7 to 9 As shown, the safety belt is first coupled to the safety belt coupling portion 561 of the linkage 50. The rope opening A of the housing 10 is then opened to allow the rope B to enter the rope groove 141 of the rope seat 14 through the rope opening A. To open the rope opening A of the housing 10, the user first pulls the handle 56 of the linkage 50, rotating the linkage 50 counterclockwise from the seventh position to the eighth position. At this point, the abutting top 521 of the linkage 50 leaves the abutting surface 242, and the handle 56 shifts the second arm 46 of the locking member 40.

[0100] When the abutting surface 242 of the cam member 20 is no longer abutted by the abutting end 521 of the connecting member 50, the center of gravity G of the cam member 20 is pulled by gravity to rotate the cam member 20 from the first position to the second position in the counterclockwise direction, so that the cam portion 24 is moved into the assembly space S of the cartridge portion 16 except for the corner of the cam portion 24 in the rotation direction L3. When the knob 56 pushes the second arm 46 of the locking member 40, the locking member 40 is rotated from the fifth position to the sixth position in the clockwise direction, the first arm 44 of the locking member 40 is pivoted from the fifth position to the sixth position to release the limiting member 30. At this time, the user can press the button 34 of the limiting member 30 to align the neck portion 342 with the edge of the second section 1633, and then push the button 34 from the first section 1632 to the second section 1633, so that the slider 32 is moved along the track 1611 toward the locking member 40 to move the limiting member 30 from the fifth position to the sixth position, and the limiting wheel 323 is moved into the rope seat portion 14 of the casing 10 to open the rope insertion opening A of the casing 10.

[0101] When the rope insertion opening A of the casing 10 is opened, as shown in Figures 8 to 9 , the user holds the casing 10 to incline the casing 10 relative to the rope B, and then sets the rope insertion recess 121 of the casing 10 on the rope B, and then adjusts the casing 10 to pass the rope B through the rope insertion opening A into the rope groove 141 of the rope seat portion 14, and then the user releases the button 34, as shown in Figure 6 , the limiting member spring 327 pushes the slider 32 to return to the third position; as shown in Figure 7 and Figure 9 , at this time, the limiting wheel 323 is moved into the rope insertion opening A and abuts against the rope B, and the locking member 40 is also returned to the fifth position, so that the operation of setting the rope grabber 100 on the rope B is completed.

[0102] When the rope grabber 100 is used, as shown in Figure 3 , the setting mode of the casing 10 is that the first direction L1 is upward and the second direction L2 is downward, i.e. the direction of the ground. When the casing 10 is upside down, the casing 10 is changed from Figure 8 to Figure 10When the cam member 20 is located at the second position, the center of gravity G is located at the side of the cam member pivot 22 closer to the second direction L2 and closer to the rope seat 14. Therefore, when the housing 10 is upside down, the center of gravity G of the cam member 20 is pulled by gravity to rotate clockwise to the first position to close the rope insertion opening A. At the same time, the closing member 19 is also pulled by gravity to slide the guide rod 191 along the inclined hole 182 to the position where the closing member 19 closes the entrance 144, so that the rope cannot be inserted into the rope groove 141 through the rope insertion opening A and the entrance 144, and the housing 10 is prevented from being arranged in the wrong direction on the rope.

[0103] The above merely provides preferred and workable embodiments of the present application, and equivalent changes made according to the specification and claims of the present application shall be included in the patent scope of the present application.

Claims

1. A rope grab comprising: a housing having a rope seat portion and a case portion; the rope seat portion having a rope slot for a rope to pass through, the rope slot penetrating through opposite sides of the housing and having a wall surface; a cam member pivotally connected to the case portion and pivotable between a first position and a second position; the cam member having a cam portion; the cam member being in the first position to hold the rope together with the wall surface; a limiting member movably disposed in the case portion and movable between a third position and a fourth position; the limiting member having a limiting wheel; the limiting wheel being closer to the rope slot when the limiting member is in the third position than when the limiting member is in the fourth position, thereby to limit the rope in the rope slot; a locking member pivotally connected to the case portion and pivotable between a fifth position and a sixth position; the locking member having a first arm and a second arm; the locking member being in the fifth position to limit the limiting member from moving from the third position to the fourth position; a locking member spring being coupled between the locking member and the case portion to return the locking member to the fifth position; and a linkage member pivotally connected to the case portion and pivotable between a seventh position and an eighth position; the linkage member having a stop end and a safety belt coupling portion; the linkage member being in the seventh position to stop the stop end against the cam member to limit the cam member in the first position; the linkage member being in the eighth position to move the second arm to pivot the first arm from the position limiting the limiting member towards the sixth position.

2. The rope grab according to claim 1, wherein the case portion has a track formed therein, and the case portion has a cover plate having a button hole, the button hole having a first section and a second section with a width narrower than the first section on opposite sides of the button hole; the limiting member has a slider movably disposed in the track and having a button slot; a button being received in the button slot, a button spring being disposed in the button slot to stop the button; the button extending out of the first section, and the button having a neck portion around the button, the neck portion being misaligned with edges of the second section, and the neck portion having a width narrower than the width of the second section on opposite sides of the second section.

3. The rope grab according to claim 2, wherein the slider has a limiting wheel seat and a stop portion on opposite ends of the slider, respectively; the limiting wheel being rotatably coupled to the limiting wheel seat; the first arm of the locking member pointing towards the stop portion along an extension direction of the track to limit the slider of the limiting member from moving from the third position to the fourth position along the track.

4. The rope grab according to claim 2, wherein the case portion has a spring seat at an end of the track away from the rope seat portion; the slider having a limiting member spring slot having a closed end, a limiting member spring being disposed in the limiting member spring slot with opposite ends of the limiting member spring stopping against the closed end and the spring seat, respectively. ​ 5. The rope grab according to claim 1, wherein said rope groove has an exit and an entrance at opposite ends thereof; said limiting member is extended from said fourth position to said third position, said limiting wheel is extended from said housing toward said exit.

6. The rope grab according to claim 5, wherein said rope groove extends along a direction of a rope passing axis, said rope passing axis has a first direction and a second direction corresponding to opposite directions of said exit and said entrance; said cam member has a cam member pivot portion, said cam member pivot portion is pivotally connected to said housing, said cam portion is connected to one side of said cam member pivot portion and has a center of gravity; when said cam member is at said second position, said center of gravity is located at a side of said cam member pivot portion closer to said rope seat portion in said second direction.

7. The rope grab according to claim 6, wherein a cam member spring is combined between said cam member and said housing, said cam member spring applies a biasing force to said cam member, said biasing force tends to pivot said cam member in a direction of said first position, an influence of said biasing force on the pivoting movement of said cam member is less than an influence of gravity on the pivoting movement of said cam member.

8. The rope grab according to claim 5, wherein said rope seat portion has a closure seat connected to one end corresponding to said entrance, said closure seat has two opposite side plates, two inclined holes are formed opposite to each other at said two side plates, said two inclined holes are closer to said entrance at a side closer to said housing, and said two inclined holes are farther away from said entrance at a side farther away from said housing; a closure is arranged in said closure seat, said closure has a guide rod, two ends of said guide rod are arranged in said two inclined holes; when said closure is pulled by gravity to move along said two inclined holes to a position closer to said housing, said closure closes said entrance.

9. The rope grab according to claim 8, wherein said housing has a base plate, said base plate has two sides connected to said rope seat portion and said housing respectively, a rope placing opening is formed between said base plate, said rope seat portion and said housing, a rope placing recess is formed at a portion of said base plate adjacent to said rope seat portion; at least a portion of said cam portion of said cam member extends into said rope placing opening; when said limiting member is at said third position, said limiting wheel extends into said rope placing opening.

10. The rope grab according to claim 1, wherein said cam member is moved from said second position to said first position along a rotation direction, one side of said cam portion opposite to said rotation direction has an abutting surface for abutting said abutting end of said connecting member, thereby limiting said cam member at said first position.

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