TWI841352B - Tie-down capable of automatically reeling a strap at proper speed - Google Patents

Abstract

A tie-down includes a frame, a handle, a reel, a driving detent, a retaining detent and a brake. In a manual mode, the handle is pivoted back and forth on the frame to make the detents alternately engage with two ratcheted wheels of the reel to reel a strap. To switch the tie-down to an automatic mode, the handle is lifted to disengage the detents from the ratcheted wheels to allow a coil spring to rotate the reel to reel the strap. The brake is in contact with the ratcheted wheels to render the reeling at proper speed. The brake is directly movable away from the ratcheted wheels to allow the coil spring to further rotate the reel to completely reel the strap.

Description

Hand puller with built-in brake

The present invention relates to the field of tying, and in particular to a hand puller having the multiple effects of automatically retracting a long belt and braking to slow down the retraction rate.

China Patent No. 2871975 discloses a pulley composed of two gears connected to both sides of a shaft tube. One end of a rope is tied to a hook, and the other end is connected to a hinge. The hinge passes through the shaft tube and is installed in a frame, so that the pulley is installed in the frame and can rotate the rope of the shaft tube to retract the part. The frame is equipped with a clamping piece, which elastically clamps the teeth of the gear to prevent the pulley from rotating relative to the frame. A handle is connected to the hinge to switch between a manual winding mode and an automatic winding mode.

In the manual winding mode, the handle moves from a closed position to an extended position, a positioning member of the handle engages the corresponding tooth, and the pulley is manually driven to rotate an angle, so that the shaft tube reels a portion of the rope. When the handle returns from the extended position to the closed position, the bevel of the tooth pushes the positioning member away, so the positioning member does not work on the pulley. At this moment, the clamping member is pushed away by the teeth.

In the automatic winding mode, the handle moves to a release position to release the locking relationship between the clamping member and the ratchet. A coil spring is installed on the outside of the frame, and the coil spring automatically reels the remaining rope together with the shaft tube through the hinge. During automatic winding, the coil spring is free and pulls back the hook of the rope by inertia, which may cause unexpected accidents.

China's patent case No. 100391645C discloses an automatic belt tensioner, which has a structure similar to the aforementioned patent case No. '975, with the difference being that a brake plate assembly is added to reduce the speed at which a belt reel reels in to reel in a long webbing.

However, the brake plate assembly is mounted on a housing, and a handle of the housing closes and covers the brake plate assembly. A user's finger passes through a hollow portion of the handle and presses a manual button of a large baffle assembly. The large baffle assembly is swingably connected to the handle, thereby pushing the brake plate assembly away from the ratchet of the take-up reel, so that the take-up reel can freely reel in the local long webbing, so the tensioner belongs to an indirect trigger type automatic take-up structure.

Secondly, the two pressure pins of the large baffle assembly become contact points, which indirectly trigger the two contact pins of the brake plate assembly. The contact pins and the corresponding pressure pins do not contact correctly, and the friction between them delays the response time of the brake plate assembly, causing the automatic belt retraction to pause.

In addition, the strap fastening device of U.S. Patent No. 8,312,601 is composed of a support frame, a handle, a reel, a first stop device and a second stop device. A shaft is installed on the two vertical walls of the support frame, and the shaft is connected to a spiral spring outside the vertical wall through the two side cams of the handle and the two ratchets of the reel, supporting the reel to automatically reel in a long strap. The first stop device is installed between the two vertical walls, and elastically engages the ratchet teeth of the ratchet to prevent the reel from continuing to reel. The two supporting shafts of the second stopper are between a tail section and two angle forks, and each angle fork has a top fork extending upward and a bottom fork extending downward. The two supporting shafts pass through the two side cams of the handle, and a spring is sleeved on the two supporting shafts to press the angle fork, so that the bottom fork contacts one of the two arc-shaped edges of the vertical wall, and the top fork rubs against the corresponding ratchet to produce a braking effect, and the tail section is kept in an open state of the handle. The tail section is pressed down by force, and the braking effect of the top fork and the ratchet is released, so that the reel automatically reels the long belt. Alternatively, the bottom fork is allowed to pass over a stopper portion of the vertical wall to reach another arc-shaped edge, and the top fork resists the ratchet, so that the handle can manually retract the long belt.

In both automatic and manual reeling modes, the top fork is susceptible to wear and loss of precision. After a period of use, this may have an adverse effect on the automatic or manual reeling.

Therefore, how to improve the braking performance of the hand puller becomes an urgent problem to be solved by the present invention.

In view of this, the inventor of this case proposed a new generation of hand puller, the main purpose of which is: the handle covers the brake part, becoming the starting point for manual belt retraction, and lifting the handle to directly trigger the brake part to control the speed of automatic belt retraction, effectively solving the disadvantages of the previous technology caused by indirect triggering.

In order to achieve the above purpose, the main concept of the hand puller of the present invention is: a handle is connected to a body, which can switch between a manual mode and an automatic mode. A pulley is installed at the intersection of the handle and the body, and is used to reel in a long belt with a hook. In the manual mode, the handle can cover a brake member of the body, becoming a starting point for manually retracting the long belt. In the automatic mode, the handle is lifted, so that the brake member prevents the pulley from retracting the long belt. Directly starting the brake member releases the braking force of the pulley, allowing the pulley to automatically retract the long belt.

In order to make the purpose, features and advantages of the present invention easy to understand, one or more preferred embodiments are given below with detailed descriptions in conjunction with the attached drawings.

10: Body

11: Base plate

12: Binding hole

13: Side film

14, 28: Edge

15: Manual rolling area

16: Starting point

17: Ending point

18: Automatic winding section

19: Sliding groove

20: Swing hole

21: Spindle hole

22: Secondary shaft hole

23:Fixing hole

24: Grip

25: Bending part

26: Perforation

27: Support sheet

29: The first curved surface

30: The second curved surface

31: The third curved surface

32: hinge hole

33: Chute

34: Brake parts

35: Wings

36: Pressing section

37: Start button

38: Axle

39: Hole

40: Elastic parts

41: Torsion spring

42: First step

43: Second leg

44:Metal ring

45: Connecting strip

46: Main shell

47: Long belt

48:Hook

49: Subchaeta

50: Pulley

51: Gear

52: Thorns

53: Reel

54: Main axis

55: Fasteners

56: Fork

57:Vortex spring

58: Cylinder

59: Active pawl

60: Switching part

61, 64: Paws

62, 65: Compression spring

63: Check pawl

66: Plate

67: Auxiliary shaft

68:Tape collection direction

69, 70: Arrows

71: Pull direction

100:Hand puller

Figure 1 shows a preferred embodiment of the hand puller of the present invention.

Figure 2 is a bird's-eye view of the main structure of the hand puller.

Figures 3 to 6 show the specific functional shapes of the main body, handle, brake parts and elastic parts.

Figure 7 shows the internal structure cut along line A-A in Figure 2.

Figure 8 shows the internal structure cut along line B-B in Figure 2.

Figure 9 depicts the hand puller in automatic retraction mode.

Next, the embodiments of the present invention are described in conjunction with the attached drawings. In the attached drawings, the same reference numerals are used to represent the same or similar structures or units. It is foreseeable that the embodiments described are only examples of part of the present invention, not all of the embodiments. Other embodiments can be derived based on the examples described, or structures that can be modified or changed as needed are all within the scope of protection of the present invention.

In the following description, directional terms such as "up", "down", "left", "right", "front", "back", "inside", "outside" and "side" are only used to refer to the directions of the attached drawings. The use of directional terms is for better and clearer description and understanding of this case, and does not express or imply that the device or component described must have a specific orientation, structure and operation, so it cannot be understood as a limitation on the technical content of this case.

Unless otherwise specified and clearly defined, in the following description, "installed", "connected", "connected" or "located on" should be understood in a broad sense, such as fixed connection, detachable connection, integral connection, mechanical connection, direct connection, indirect connection or connection between two components. For technicians in the field of this case, they can understand the specific meanings of the above terms in various embodiments and even this case based on their general knowledge or experience.

Unless otherwise specified, in the following descriptions, "plurality" means two or more.

In Figure 1, a preferred embodiment of a hand puller 100 of the present invention is to connect a body 10 to a handle 24, and a pulley 50 is provided at the gathering point of the body 10 and the handle 24. The handle 24 has an active pawl 59, which is against a secondary shaft 67 of the body 10, and the secondary shaft 67 pivots a brake member 34 on the right side of the body 10, so that the handle 24 covers the upper part of the brake member 34. The body 10 is provided with a secondary shell 49 on the outside, which can pass through a main shell 46 that covers a part of the body 10. A long belt 47 is pulled out from the side of the main shell 46, and a hook 48 is tied to the protruding end of the long belt 47.

As shown in FIG. 3 , the main body 10 has a rectangular bottom plate 11, and a fastener (not shown) is received in a coupling hole 12 of the bottom plate 11. The fastener penetrates into an object like a rivet or a bolt, so that the main body 10 is connected to the object, such as a wall. The main body 10 also has two side pieces 13 of the same shape. The two side pieces 13 are bent in the same direction on both sides of the bottom plate 11. One end of each side piece 13 forms a secondary shaft hole 22 for the secondary shaft to pass through. The secondary shaft hole 22 forms a swing hole 20, a main shaft hole 21, a sliding groove 19 and a fixing hole 23 to the other end of the side piece 13. The main shaft hole 21 can receive a main shaft. Above the main shaft hole 21 is an automatic retracting portion 18. The automatic retracting portion 18 is sunken into an edge 14 of the side piece 13, and is next to a manual retracting area 15 of the edge 14. The two ends of the manual retracting area 15 are defined as a starting point 16 and an end point 17. The starting point 16 is roughly above the swing hole 20, and the end point 17 is adjacent to the automatic retracting portion 18, so that the manual retracting area 15 is sunken into the edge 14 of the side piece 13.

In FIG. 7, a fork 56 of the main shaft 54 enters the interior of the sub-housing 49 through the main shaft hole 21 of the two side pieces 13. A fastener 55 is embedded in the main shaft 54 and resists one of the two side pieces 13. A flange (not numbered) of the main shaft 54 resists the other side piece 13, so that the main shaft 54 does not easily leave the main body 10. The sub-housing 49 is fixed to the outside of the side piece 13 by other fasteners such as bolts. The sub-housing 49 receives a coil spring 57, one end of which is connected to the fork 56 and the other end is connected to the inner side of the sub-housing 49, providing a torque to the main shaft 54.

In this embodiment, the pulley 50 is connected to a reel 53 between two gears 51, and they are designed as one body. A plurality of continuous ratchets 52 protrude around the gears 51. The reel 53 is sleeved on the outside of the main shaft 54, and the main shaft 54 supports the pulley 50 between the two side pieces 13 and can rotate relative to the main body 10. The main shaft 54 passes through the other end of the long belt 47, so that the reel 53 reels a portion of the long belt 47.

In some embodiments, the gear 51 and the reel 53 are independent of each other. The reel 53 is combined with the structure of the gear 51, just like the '975 patent.

It is not difficult to see from Figures 2 and 3 that a non-return pawl 63 is similar to a T-shaped body, which passes through a compression spring 65 and a plate 66. The two ends of the plate 66 are inserted into the fixing hole 23 and do not move. One end of the compression spring 65 supports the plate 66, and the other end pushes the non-return pawl 63 to move toward the pulley 50. The two pawls 64 of the non-return pawl 63 span the corresponding sliding groove 19, and the sliding groove 19 guides the pawl 64 to bite the ratchet 52 of the gear 51, prohibiting the pulley 50 from releasing the long belt 47. At the same time, the ratchet 52 transmits the force of the pawl 64 to the main shaft 54, offsetting a part of the torque of the winding spring.

Next, see Figures 5, 6, and 8. The brake component 34 has a wing 35 with an irregular hollow design. Two pressing parts 36 are formed at the front end of the wing 35, and a start button 37 is set at the rear end. Two shafts 38 with holes 39 are bent in the same direction on both sides of the wing 35. The secondary shaft 67 passes through the holes 39 of the two shafts 38, so that the pressing part 36 is located in the corresponding swing hole 20, so that the brake component 34 is connected to the two side plates 13 and can swing relative to the bottom plate 11.

In this embodiment, a connecting bar 45 of an elastic member 40 connects the second legs 43 of two torsion springs 41. The torsion spring 41 has more than one metal ring 44, and the metal ring 44 is connected to a first leg 42 and the second leg 43 respectively.

When assembled, the two metal rings 44 are sleeved around the secondary shaft 67, just outside the shaft 38. The first leg 42 contacts the top surface of the bottom plate 11, allowing the second leg 43 and the connecting strip 45 to resist the bottom surface of the wing 35, providing the torque for the pressing part 36 to move toward the upper part of the swing hole 20. At this moment, the ratchet 52 receives the force of the pressing part 36, and can also offset the torque of the winding spring part, so that the pulley 50 is stationary relative to the body 10.

In conjunction with Figures 4, 7, and 8, the handle 24 is installed on the hand puller 100. The two supporting plates 27 of the handle 24 are on both sides of a bent portion 25. The bent portion 25 has a through hole 26. The two supporting plates 27 have the same shape, a slide groove 33 of the supporting plate 27 is closer to the bent portion 25 than a hinge hole 32, and the edge 28 of the supporting plate 27 around the hinge hole 32 forms a continuous first curved surface 29, a second curved surface 30, and a third curved surface 31.

When assembled, a cylinder 58 of the side piece 13 is inserted into the corresponding hinge hole 32, so that the support piece 27 is aligned with the inner side of the side piece 13, so that the handle 24 rotates around the main shaft 54.

As shown in Figures 1, 2, and 8, the active pawl 59 is also T-shaped and passes through other compression springs 62 and the through hole 26 of the bent portion 25. One end of the compression spring 62 supports the bent portion 25, and the other end pushes a pull portion 60 of the active pawl 59, so that the active pawl 59 moves toward the pulley 50 as normal. The two pawls 61 of the active pawl 59 straddle the slide groove 33 and resist the edge 14 of the side piece 13 along the length direction of the slide groove 33, allowing the handle 24 to switch between a manual mode and an automatic mode.

In manual mode, the active pawl 59 falls on the manual retracting area 15 of the side plate 13, and the pawl 61 is adjacent to the starting point 16 and bites the ratchet 52 of the gear 51. The non-return pawl 63 faces the second curved surface 30 of the support plate 27, and the second curved surface 30 is lower than the ratchet 52 of the gear 51, so the pawl 64 will bite the corresponding ratchet 52. At this moment, the elastic member 40 pushes the wing 35 of the brake member 34, so that the pressing part 36 moves toward the top of the swing hole 20, thereby touching the first curved surface 29 of the support plate 27, and the ratchet 52 can be locked.

Along the direction of an arrow 69, the handle 24 moves from the solid line position to the dashed line position, and the pawl 61 leaves the starting point 16 of the manual winding area 15 and arrives at the end point 17. At the same time, the pawl 61 pushes the ratchet 52 of the pulley 50, so that the reel 53 rotates about three angles of the ratchet 52 along a winding direction 68 to rewind the partial long belt 47. The handle 24 returns from the dashed line position to the solid line position, and the pawl 61 passes over the ratchet 52 of the pulley 50, and returns from the end point 17 of the manual winding area 15 to the starting point 16, and the manual winding operation is performed again. Because the non-return pawl 63 bites the corresponding ratchet 52, the pulley 50 is prevented from reversing and releasing the long belt 47.

As shown in FIG. 9 , the pawl 61 leaves the manual winding area 15 and enters the automatic winding part 18, so that the handle 24 stands vertically above the bottom plate 11. The pull part 60 is forced to squeeze the compression spring 62. The third curved surface 31 exceeds the height of the ratchet 52, so that the non-return pawl 63 does not contact the ratchet 52 of the gear 51. At the same time, the second curved surface 30 of the support plate 27 faces the brake member 34, so the pressing part 36 contacts the corresponding ratchet 52, counteracting the torque of the pulley 50 and preventing the pulley 50 from releasing the long belt 47.

In the automatic mode, along a pulling direction 71, the long belt 47 is pulled out of the hand puller 100, and the ratchet 52 of the pulley 50 presses down the brake member 34 in turn. Along the direction of another arrow 70, the start button 37 is subjected to force, driving the wing 35 to rotate around the secondary shaft 67, so that the pressing part 36 moves toward the bottom of the swing hole 20, releasing the braking force applied by the pressing part 36 to the ratchet 52 of the gear 51, so that the pulley 50 can quickly retract the partial long belt 47. After the start button 37 is released, the torsion spring 41 pushes the wing 35 of the brake member 34 to swing upward, and the pressing portion 36 returns to the upper part of the swing hole 20, and touches the ratchet teeth 52 again to generate braking force, prohibiting the pulley 50 from rotating, thereby controlling the speed of the long belt 47.

In this embodiment, the hand puller 100 has the following advantages:

First, in the manual mode, the handle 24 is at the starting point, which shields the brake component 34 and has a protective effect, making the brake component 34 unable to start.

Second, in the automatic mode, the handle 24 is lifted, and the brake member 34 can be directly triggered to control the speed of automatic belt retraction, effectively solving the drawbacks of the previous technology caused by indirect triggering.

Without departing from the broad concept of this case, those familiar with this technology can understand and make changes to the above-mentioned embodiments. Therefore, this case is not limited to the specific embodiments disclosed in the specification. All modifications made according to the spirit and technical scope of this case should be covered and protected by the text content defined in the scope of the patent application.

10: Body

13: Side film

24: Grip

33: Chute

34: Brake parts

46: Main shell

47: Long belt

48:Hook

49: Subchaeta

50: Pulley

52: Thorns

59: Active pawl

61: Paw

62: Compression spring

67: Auxiliary shaft

100:Hand puller

Claims (3)

A hand puller with built-in brakes comprises: a main body (10) having two side pieces (13) of identical shape, an edge (14) of the side piece (13) forming a manual retracting area (15) and an automatic retracting portion (18), a starting point (16) and an end point (17) of the manual retracting area (15) being adjacent to the automatic retracting portion (18) and a swing hole (20) respectively, the automatic retracting portion (18) and the end point (17) of the manual retracting area (15) being adjacent to the automatic retracting portion (18) and a swing hole (20) respectively, 8) above a main shaft hole (21), the main shaft hole (21) passes through the side plate (13), and has a sliding groove (19) and the swing hole (20) on both sides; a main shaft (54), which passes through the main shaft holes (21) of the two side plates (13) and can transmit a torque; a pulley (50), which is connected to a drum (53) between the two gears (51), and the gears (51) have a plurality of protruding A ratchet (52), the drum (53) is sleeved on the outside of the main shaft (54), the main shaft (54) supports the pulley (50) between the two side pieces (13); a long belt (47), one end of which is tied with a hook (48), the long belt (47) is partially wound around the drum (53); a non-return pawl (63), which is installed in the sliding groove (19) of the two side pieces (13), the non-return pawl (63) 3) the ratchet (52) of the gear (51) is elastically engaged; a brake member (34) having two pressing portions (36) formed at one end, the brake member (34) being connected to the body (10) and being rotatable, so that the pressing portion (36) is inserted into the swing hole (20) of the side plate (13) and elastically contacts the ratchet (52) of the gear (51) in a normal state; a handle (24) having two supporting plates The support plate (27) is formed with a hinge hole (32) and a slide groove (33), and the support plate (27) forms a first curved surface (29), a second curved surface (30) and a third curved surface (31) around an edge (28) of the hinge hole (32); and an active ratchet (59) mounted on the two support plates (2 7), the active pawl (59) elastically resists the edge (14) of the side plate (13), so that the handle (24) switches between a manual mode and an automatic mode; in the manual mode, the active pawl (59) pushes the ratchet (52) from the starting point (16) to the end point (17) of the manual retracting area (15), so that the reel (53) retracts the local long belt (47), and the support plate (2 The second curved surface (30) of the side plate (7) faces the non-return pawl (63), and the first curved surface (29) contacts the pressing portion (36) of the brake member (34), so that the non-return pawl (63) cooperates with the pressing portion (36) to engage the corresponding ratchet (52), thereby preventing the pulley (50) from releasing the long belt (47); in the automatic mode, the active pawl (59) is positioned at the automatic retracting portion (18) of the side plate (13), and does not Then the non-return pawl (63) contacts the ratchet (52) of the gear (51), and is pushed away from the ratchet (52) by the third curved surface (31) of the support plate (27). The pressing portion (36) contacts the second curved surface (30) of the support plate (27), resists the ratchet (52) of the gear (51) and stops the pulley (50) from retracting the long belt (47), but does not prevent the long belt (47) from being pulled out. A hand puller with built-in brake as described in claim 1, wherein the brake member (34) has a wing (35), the front end of the wing (35) forms two pressing parts (36), and the rear end is provided with a start button (37), and each side of the wing (35) has a shaft (38) with a hole (39), and a secondary shaft (67) passes through the holes (39) of the two shafts (38), so that the wing (35) is rotatably installed between the two side plates (13). The hand puller with built-in brake as described in claim 2 also has an elastic member (40), which is composed of a connecting bar (45) connected to two torsion springs (41). The two torsion springs (41) are installed on the secondary shaft (67) so that the connecting bar (45) presses against the wing (35) of the brake member (34) to provide the elastic force required for the pressing part (36) to contact the ratchet (52).

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