CN214095741U

CN214095741U - String pulling device safe to use

Info

Publication number: CN214095741U
Application number: CN202022807883.0U
Authority: CN
Inventors: 林耀钻; 郑峰; 王骏
Original assignee: Ningbo Haibo Precision Machinery Manufacturing Co ltd
Current assignee: Ningbo Haibo Precision Machinery Manufacturing Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-08-31
Anticipated expiration: 2030-11-27

Abstract

A string pulling device safe in use is improved on the basis of the prior base, a rotating shaft, a winding wheel, a one-way bearing and the like, and also comprises a main shaft which is distributed in parallel with the rotating shaft, wherein the main shaft is provided with a small-diameter section, and the one-way bearing is arranged on the main shaft adjacent to the small-diameter section; the gear set comprises a first gear and a second gear, wherein the first gear is arranged on the rotating shaft and the second gear is positioned on the main shaft; the driving disc is arranged on the main shaft and can rotate along with the main shaft; the sliding disc is arranged on the main shaft between the driving disc and the one-way bearing, at least one of the opposite end surfaces of the sliding disc and the driving disc is provided with a spirally-raised inclined surface, and when the driving disc rotates, the sliding disc and the one-way bearing can be pushed to axially move through the inclined surface, so that the one-way bearing falls into the small diameter section; and a spring connected with the one-way bearing to make the one-way bearing and the sliding disk always have a tendency of moving towards the driving disk side. The utility model discloses simple structure, convenient operation and the advantage that the use is got up safely have equally.

Description

String pulling device safe to use

Technical Field

The utility model relates to an annex technical field of crossbow specifically indicates a string ware that draws safe in utilization.

Background

The crossbow is an ancient cold weapon, mainly comprises crossbow arm, crossbow bow, bow string, crossbow machine and other parts, and has the advantages of long shooting range, high hit rate and low requirement on users. When in use, in order to easily pull the bow string, a string pulling device is often arranged, and the structure of the string pulling device is diversified at present, for example, a structure is disclosed in 'silent string pulling device' with the Chinese patent authorization publication number of CN206755986U, the structure comprises a base, a rotating device and a string hooking device, wherein the base is provided with a combination part connected with the crossbow; the rotating device comprises a rotating shaft which is rotatably connected in the mounting hole of the base, and two sides of the rotating shaft are connected with two winding wheels; the string hooking device comprises two hooks and a pull rope; a one-way bearing is sleeved on the rotating shaft; the inner ring of the one-way bearing is provided with a plurality of through holes distributed along the circumferential direction of the one-way bearing, a roller is in clearance fit in each through hole and is abutted against the outer side wall of the rotating shaft, and the inner side wall of the outer ring of the one-way bearing is sequentially provided with a concave part which is contacted with each roller along the circumferential direction and is gradually deepened along the circumferential direction; the base is provided with an elastic element which always pushes the inner ring of the one-way bearing and enables the roller to be positioned at the shallow part of the concave part. The string pulling device has simple structure and no sound noise when pulling strings. Meanwhile, the use is safer due to the unidirectional effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art, provide a string pulling device safe in utilization of same simple structure.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a string puller which is safe in use, comprising:

the base is internally provided with a first shaft hole, and the base is provided with a combining part connected with the crossbow;

a rotating shaft rotatably installed in the first shaft hole of the base;

the winding wheel is arranged on the rotating shaft;

the string hooking piece is connected with the pull rope wound on the winding wheel;

the crank is used for driving the rotating shaft and the winding wheel; and

a one-way bearing;

it is characterized by also comprising:

the main shaft is distributed in parallel with the rotating shaft and is rotatably arranged in the second shaft hole of the base, a small-diameter section is arranged on the main shaft, and the one-way bearing is arranged on the main shaft adjacent to the small-diameter section;

the gear set comprises a first gear and a second gear which are meshed with each other, the first gear is arranged on the rotating shaft, and the second gear is positioned on the main shaft;

a drive disk mounted on the spindle so as to be rotatable therewith;

the sliding disc is arranged on the main shaft between the driving disc and the one-way bearing, at least one of the opposite end surfaces of the sliding disc and the driving disc is provided with a spirally-raised inclined surface, and when the driving disc rotates, the inclined surface can push the sliding disc and the one-way bearing to axially move so that the one-way bearing falls into the small diameter section;

and the spring is connected with the one-way bearing, so that the one-way bearing and the sliding disk always have the tendency of moving towards the side of the driving disk.

In the above solution, preferably, the number of the inclined planes is two, the two inclined planes are circumferentially arranged on the sliding disc at intervals, and the driving disc is provided with a driving rod contacting and matching with the corresponding inclined plane.

In order to facilitate the rotation of the driving disc, an operating handle is installed on the driving disc, and an operating hole for exposing the operating handle is formed in the base.

Preferably, the second gear is mounted on the main shaft through a gear shaft, and the crank is mounted on an end portion of the gear shaft.

In order to prevent the sliding disk from moving excessively, a blocking part is arranged on the peripheral surface of the sliding disk, and a positioning groove which is abutted against the blocking part is arranged on the edge of the opening part of the second shaft hole.

In each scheme, for the purpose of balanced stress, the string hooking part is provided with a positioning part for sleeving the bowstring, the string hooking parts on two sides of the positioning part are provided with two pulleys, one end of the pull rope is fixed on one reel, and the other end of the pull rope is fixed on the other reel after sequentially passing around the two pulleys.

Compared with the prior art, because the utility model discloses add the main shaft of taking the path section to let one-way bearing install on the main shaft of neighbouring this path section, when consequently needing the bowstring, because under the effect of spring, the main shaft can only unidirectional rotation receive the line promptly, rotate the crank this moment, drive the main shaft and rotate, through the transmission of gear train, let the take-up pulley rotate and receive the line, let collude the string spare and stimulate the bowstring. And in case rotate the driving-disc, just can promote one-way bearing through the sliding disk and fall into path section department, the roller in the one-way bearing is no longer acted on the main shaft this moment, also does not play unidirectional action again, and pivot and main shaft all can just reverse rotation and drive the take-up reel and rotate, so the utility model discloses also only need to do a rotatory action and just can switch one-way function, therefore have simple structure, convenient operation and use safe advantage equally.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is another perspective view of FIG. 1 (with the pull cord removed);

fig. 3 is a schematic perspective exploded view of an embodiment of the present invention;

FIG. 4 is a further exploded view of FIG. 3

Fig. 5 is a schematic cross-sectional view of an embodiment of the present invention at the spindle;

FIG. 6 is a perspective view of the base;

fig. 7 is a perspective view of the sliding tray.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 7, for the preferred embodiment of the string pulling device of the present invention, the string pulling device includes a base 1, a rotating shaft 2a, a winding reel 3, a string hooking member 4, a pulling rope 5, a main shaft 2b, a one-way bearing 6, a gear set 7, a driving disc 8, a sliding disc 9 and a crank 10, wherein the base 1 is provided with a combination portion 11 connected with a crossbow, specifically an insertion rod, which can be directly inserted into an insertion hole of the crossbow, so that the installation is very convenient and fast, and the base 1 is provided with a first shaft hole 12 and a second shaft hole 13 parallel to each other by a central line. The rotating shaft 2a is rotatably installed in the first shaft hole 12 of the base 1 through the first bearing 20, two ends of the rotating shaft 2a are exposed out of the base 1 and then are provided with the winding wheels 3, namely two winding wheels 3 are provided, each winding wheel 3 is provided with a cover 30, and each cover 30 is detachably fixed on the corresponding side surface of the base 1 through a screw; the string hooking part 4 is connected with a pulling rope 5 wound on the winding wheel, specifically, the string hooking part 4 is provided with a positioning part 41 for sleeving a bow string, pulleys 40 are installed on the string hooking parts at two sides of the positioning part 41, one end of the pulling rope 5 is fixed on one winding wheel 3, and the other end of the pulling rope 5 is fixed on the other winding wheel 3 after sequentially passing around the two pulleys 40.

The main shaft 2b is rotatably installed in the second shaft hole 13 of the base 1, that is, the main shaft 2b is parallel to the rotating shaft 2a, the main shaft 2b has a small diameter section 21b, the one-way bearing 6 is installed on the main shaft 2b adjacent to the small diameter section 21b, the one-way bearing 6 comprises an outer ring, an inner ring and a roller, the outer ring is located in the second shaft hole 13, cannot rotate relative to the base 1, but can axially slide relative to the base 1, the roller can roll in a gradually deepened recess of the inner wall of the outer ring and is in contact with the main shaft 2b, the structure and the one-way principle of the roller are the prior art, and detailed description thereof is omitted. The gear set 7 includes a first gear 71 and a second gear 72 engaged with each other, the first gear 71 is mounted on the rotating shaft 2a, the second gear 72 is located on the main shaft 2b, for the convenience of processing and the convenience of mounting the spring 50 described below, in the present embodiment, the second gear 72 is mounted on the main shaft 2b through a gear shaft 73, that is, as shown in fig. 5, one end of the main shaft 2b is inserted into a blind hole at the end of the gear shaft 73, and a radially disposed set screw 60 is threadedly connected between the two, so that the gear shaft 73 and the main shaft 2b are fixed into a whole, and the crank 10 is mounted on the other end of the gear shaft 73.

The driving disk 8 is mounted on the main shaft 2b to rotate with the main shaft 2b, and for rotating the driving disk 8, an operating handle 81 is mounted on the driving disk 8, and an operating hole 14 for exposing the operating handle is formed on the base 1.

The sliding disk 9 is installed on the main shaft 2b between the driving disk 8 and the one-way bearing 6, at least one of the opposite end surfaces of the sliding disk 9 and the driving disk 8 is provided with a spirally raised inclined surface, in order to balance the stress of the sliding disk 9, in the figure, two inclined surfaces 91 are designed and are arranged on the sliding disk 9 at intervals along the circumferential direction, and the driving disk 8 is provided with a driving rod 82 which is in contact fit with the corresponding inclined surfaces. When the driving disc 8 rotates, the inclined plane 91 can push the sliding disc 9 and the one-way bearing 6 to move axially, so that the one-way bearing 6 falls into the small-diameter section 21 b; in order to restore the one-way bearing 6 in time, a spring 50 is sleeved on the main shaft 2b, one end of the spring 50 is abutted against the bottom of the blind hole of the gear shaft 73, and the other end of the spring is abutted against the end face of the one-way bearing 6, so that the one-way bearing 6 and the sliding disc 9 always have a tendency of moving towards the driving disc 8.

In order to prevent the sliding disk 9 from moving excessively, the peripheral surface of the sliding disk 9 has a stopper 92, and the edge of the mouth of the second shaft hole 13 has a positioning groove 15 abutting against the stopper. That is, when the sliding disk 9 moves to the mouth of the second shaft hole 13 and the stopper 92 thereon falls into the positioning groove 15, the one-way bearing 6 moves just to the small-diameter section 21 b.

In order to enable the main shaft 2b to rotate reliably, the other end of the main shaft 2b is supported on the left housing 30 by the second bearing 70, and the gear shaft 73 is supported on the right housing 30 by the third bearing 80, as shown in fig. 5.

When the bowstring needs to be pulled, the operating handle 81 is pulled upwards along the operating hole 14 to a locking state, please refer to fig. 2, in the locking state, the driving rod 82 contacts with the lowest part of the inclined plane 91, under the action of the spring 50, the one-way bearing 6 and the sliding disc 9 move to the driving disc 8 side, as shown in fig. 5, the one-way function is provided, namely, the roller of the one-way bearing can act on the surface of the main shaft, the main shaft can only rotate in one direction, at this time, the crank 10 is rotated to drive the gear shaft 73 and the main shaft 2b to rotate, the rotating shaft 2a and the winding wheel 3 rotate to take up the line through the transmission of the gear set 7, the positioning part 41 of the string hooking part 4 pulls the bowstring, and the bowstring is continuously pulled until the required degree along with the pulling rope 5 continuously winding on the winding wheel. But then the handle 10 cannot be rotated in the reverse direction, i.e. the pull-cord 5 cannot be released.

When the positioning part 41 on the string hooking part needs to leave the bow string, the operating handle 81 is pulled to rotate downwards, at the moment, the driving rod 82 slides on the inclined surface 91 along with the rotation of the driving disk 8, and the sliding disk 9 and the one-way bearing 6 are axially pushed to move towards the second gear 72 side until the blocking part 92 on the sliding disk 9 falls into the positioning groove 15, the one-way bearing 6 falls into the small-diameter section 21b, at the moment, the roller in the one-way bearing 6 does not act on the main shaft 2b any more, namely, the one-way action is not performed any more, and the rotating shaft 2a and the main shaft 2b can be reversed to drive the winding wheel 3 to be reversed so as to release the pull rope 5 wound in the winding wheel. Therefore, the one-way function can be switched by only pulling the operating handle, so that the operation is convenient and the use is safe.

Claims

1. A string puller which is safe in use, comprising:

a base (1) provided with a first shaft hole (12) therein and a joint (11) connected with a crossbow;

a rotating shaft (2a) rotatably installed in the first shaft hole of the base;

the winding wheel (3) is arranged on the rotating shaft;

the string hooking piece (4) is connected with a pull rope (5) wound on the winding wheel;

a crank (10) for driving the shaft and the winding wheel; and

a one-way bearing (6);

it is characterized by also comprising:

a main shaft (2b) which is distributed in parallel with the rotating shaft and is rotatably installed in a second shaft hole (13) of the base, a small-diameter section (21b) is arranged on the main shaft, and the one-way bearing (6) is installed on the main shaft adjacent to the small-diameter section;

the gear set (7) comprises a first gear (71) and a second gear (72) which are meshed with each other, the first gear is arranged on the rotating shaft, and the second gear is positioned on the main shaft;

a drive plate (8) mounted on the spindle so as to be rotatable therewith;

the sliding disc (9) is arranged on the main shaft between the driving disc and the one-way bearing, at least one of the opposite end surfaces of the sliding disc and the driving disc is provided with a spirally-raised inclined surface (91), and when the driving disc (8) rotates, the sliding disc (9) and the one-way bearing (6) can be pushed to axially move through the inclined surface, so that the one-way bearing (6) falls into the small diameter section (21 b);

and the spring (50) is connected with the one-way bearing, so that the one-way bearing (6) and the sliding disk (9) always have the tendency of moving towards the driving disk (8).

2. The string puller according to claim 1, wherein: the two inclined planes (91) are arranged on the sliding disc at intervals along the circumferential direction, and the driving disc is provided with a driving rod (82) which is in contact fit with the corresponding inclined planes.

3. The string puller according to claim 1, wherein: an operating handle (81) is installed on the driving disc, and an operating hole (14) for exposing the operating handle is formed in the base.

4. The string puller according to claim 1, wherein: the second gear is mounted on the main shaft through a gear shaft, and the crank is mounted on the end part of the gear shaft.

5. The string puller according to claim 1, wherein: the peripheral surface of the sliding disc is provided with a blocking part (92), and the edge of the opening part of the second shaft hole is provided with a positioning groove (15) which is abutted against the blocking part.

6. The tailpiece according to any one of claims 1 to 5, wherein: collude and be equipped with location portion (41) that supply the bow string cover to establish on string piece (4), install pulley (40) on the string piece of colluding of this location portion both sides, the reel has two, the one end of stay cord (5) is fixed on one of them reel (3), and the other end of this stay cord is walked around two pulleys in proper order and is fixed on another reel.