CN213230563U

CN213230563U - Glass turning device

Info

Publication number: CN213230563U
Application number: CN202021980976.7U
Authority: CN
Inventors: 彭傲寒
Original assignee: Hubei Honggang Technology Co ltd
Current assignee: Hubei Honggang Technology Co ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-05-18
Anticipated expiration: 2030-09-11

Abstract

The utility model discloses a glass turning device belongs to LOW-E glass processing technology field. The turnover mechanism comprises a turnover seat, a turnover frame rotationally arranged on the turnover seat, a plurality of short arms arranged on the upper side of the turnover frame, a synchronizing rod arranged in the left-right direction and rotationally arranged at the lower parts of all the short arms, a long arm which is right in front of the short arms and parallel to the short arms, a plurality of sucker units arranged in parallel up and down at the front side of the long arm, an upper hinged plate between the long arm and the short arms, a lower hinged plate between the long arm and the synchronizing rod, two translation cylinders and a turnover driving mechanism, wherein the turnover driving mechanism is arranged at the rear part of the turnover frame, the long arm extends upwards relative to the short arms, the upper hinged plate and the lower hinged plate are obliquely downwards arranged from front to back and are parallel to each other, and the upper end and the lower end; the upper end of the lower hinged plate is hinged with the lower part of the long arm, and the lower end of the lower hinged plate is fixedly connected with the synchronizing rod; the translational air cylinder is obliquely and upwards arranged from front to back and is hinged to the rear side of the short arm, and the front end of the telescopic rod is hinged to the long arm.

Description

Glass turning device

Technical Field

The utility model belongs to the technical field of LOW-E glass processing, in particular to glass turning device.

Background

The LOW-E glass is also called LOW-emissivity glass, and is a film system product formed by plating a plurality of layers of metal or other compounds on the surface of the glass. The coating layer has the characteristics of high visible light transmission and high mid-far infrared ray reflection, so that the coating layer has excellent heat insulation effect and good light transmission compared with common glass and traditional coating glass for buildings.

During the production of LOW-E glass, the general flow comprises loading, cleaning, coating, detecting, post-processing, unloading and the like; when the glass is fed and discharged, the glass on the glass placing frame is required to be placed on the conveying structure and stacked on the glass placing frame, and the conveying structure passes through a plurality of procedures of cleaning, film coating, detection and post-treatment. The transfer of glass is usually effected in the prior art either manually or by means of a robot.

For the mode of adopting the manipulator, the control is complicated (the position of the manipulator is required to be stepped by a predetermined distance every time the manipulator grabs the glass) and the manipulator is expensive.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the embodiment of the utility model provides a glass turning device, for the manipulator, only need the glass rack backward or forward step motion predetermined distance at every turn can, have advantages such as control is simple, the feeding is steady with the ejection of compact and with low costs. The technical scheme is as follows:

the embodiment of the utility model provides a glass turnover device, which comprises a turnover seat 20, a turnover frame 21 which is rotatably arranged on the turnover seat 20 and is arranged along the left and right directions, a plurality of short arms 23 which are arranged side by side along the left and right directions and are arranged on the upper side of the turnover frame 21, a synchronizing rod 24 which is arranged along the left and right directions and is rotatably arranged on the lower parts of all the short arms 23, a long arm 25 which is arranged right in front of the short arm 23 and is parallel to the short arm, a plurality of sucker units 26 which are arranged side by side up and down on the front side of the long arm 25, an upper hinged plate 27 which is arranged between the long arm 25 and the short arm 23, a lower hinged plate 28 which is arranged between the long arm 25 and the synchronizing rod 24, two translational air cylinders 29, a turnover driving mechanism 210 which is used for driving the turnover frame 21 to turn over and a supporting structure 22 which is used for supporting the short arm 23, wherein the turnover driving mechanism 210 is arranged at the rear side of the, the upper end and the lower end of the upper hinge plate 27 are respectively hinged with the middle part of the long arm 25 and the upper part of the short arm 23; the upper end of the lower hinged plate 28 is hinged with the lower part of the long arm 25, and the lower end thereof is fixedly connected with the synchronizing rod 24; the two translation cylinders 29 are respectively arranged on the two short arms 23 at the two sides; the translation cylinder 29 is obliquely and upwards arranged from front to back, is hinged to the rear side of the short arm 23, and the front end of a telescopic rod of the translation cylinder is hinged to the long arm 25; all the sucker units 26 are coplanar and synchronously driven, and the two translation cylinders 29 are synchronously driven; when the short arm 23 is vertical, the short arm is parallel to the grabbed glass 2 or the laminated glass 2, and the translation cylinder 29 can enable the long arm 25 to move back and forth; the turning driving mechanism 210 can turn the short arm 23 backwards to be horizontal; when the short arm 23 is horizontal, the translation cylinder 29 can enable the long arm 25 to move up and down.

The turnover driving mechanism 210 in the embodiment of the present invention includes a driving motor 211, a speed reducer 212, two swing arms 213, two connecting rods 214, and two turnover arms 215, wherein the speed reducer 212 is in transmission connection with the driving motor 211, and driving shafts are arranged on the left and right sides of the speed reducer 212 in the left-right direction, the turnover arms 215, the connecting rods 214, and the swing arms 213 are all perpendicular to the driving shafts of the speed reducer 212, and the lower ends of the two swing arms 213 are respectively fixedly connected with the driving shafts on the two sides of the speed reducer 212; the swing arm 213 is obliquely arranged upwards from back to front, and the upper ends of the swing arm are respectively hinged with the lower end of a connecting rod 214; the connecting rod 214 is obliquely arranged upwards from back to front, and the upper end of the connecting rod is hinged with the upper end of the turnover arm 215; the lower end of the turning arm 215 is fixedly connected with the upper side of the turning frame 21, and the turning arm is arranged side by side with the short arm 23 and is shorter than the short arm 23; two turning arms 215 are located on either side of the turning frame 21.

Preferably, the two turning arms 215 and the two translation cylinders 29 in the embodiment of the present invention are arranged symmetrically with respect to the center of the turning frame 21.

Preferably, the suction cup unit 26 in the embodiment of the present invention includes a fixing base 216, a sliding rod 217 slidably disposed in the front side of the fixing base 216 in the front-back direction, a suction cup 218 at the front end of the sliding rod 217, and a spring 219 sleeved on the sliding rod 217, the fixing base 216 is fixed on the long arm 25, the sliding rod 217 is perpendicular to the long arm 25, and an enlarged portion at the rear end of the sliding rod 217 abuts against the rear side of the fixing base 216, the spring 219 is disposed between the fixing base 216 and the suction cup 218, and the suction cup 218 is perpendicular to the sliding rod 217 and parallel to the gripped glass 2 or the laminated glass 2.

Further, the long arm 25 in the embodiment of the present invention is provided with a bar-shaped hole along the vertical direction for the telescopic rod of the translation cylinder 29 to pass through and move.

Wherein, the rear side of short arm 23 in the embodiment of the present invention is provided with a cylinder support 220, and translation cylinder 29 is hinged on cylinder support 220.

Wherein, the utility model provides an in the embodiment of the utility model the synchronizing bar 24 for the round bar and through the bearing with the forearm 23 rotate be connected, the rear side of upset arm 215 is equipped with the breach that supplies the embedding of synchronizing bar 24.

Wherein, the upper hinged plate 27 and the lower hinged plate 28 in the embodiment of the present invention are both vertical to the synchronizing bar 24, and both are composed of two hinged plates which are arranged side by side at the left and right and move synchronously; the two hinge plates are respectively positioned at the left and right sides of the corresponding short arm 23 and long arm 25.

Wherein, in the embodiment of the utility model, when grabbing the glass 2 or the laminated glass 2, the short arm 23 is arranged from front to back in an inclined way, and the inclined angle is 8-15 degrees

Wherein, the embodiment of the utility model provides an in quantity of short arm 23 be 4, two upset arms 215 locate respectively between two left short arms 23 and between two short arms 23 on right side, be equipped with 3 sucking disc units 26 on every long arm 25, upper end, middle part and the lower extreme of long arm 25 are located respectively to 3 sucking disc units 26.

The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the embodiment of the utility model provides a glass turning device for the manipulator, only need the glass rack at every turn backward or step forward the motion predetermined distance can, have advantages such as control is simple, feeding and the ejection of compact are steady and with low costs.

Drawings

FIG. 1 is a schematic view of a glass turning device according to an embodiment of the present invention with short arms upright;

fig. 2 is a schematic structural view of a glass turnover device provided by an embodiment of the present invention when a short arm is horizontal;

fig. 3 is a partially enlarged view of fig. 1.

In the figure: 1, glass placing frames, 2, 3 conveying belts;

20 overturning seats, 21 overturning frames, 22 supporting structures, 23 short arms, 24 synchronizing rods, 25 long arms, 26 sucker units, 27 upper hinged plates, 28 lower hinged plates, 29 translation air cylinders, 210 overturning driving mechanisms, 211 driving motors, 212 speed reducers, 213 swinging arms, 214 connecting rods, 215 overturning arms, 216 fixed seats, 217 sliding rods, 218 suckers, 219 springs and 220 air cylinder supports.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-3, the embodiment of the present invention provides a glass turnover device, the device includes a turnover seat 20, a turnover frame 21 (the turnover frame 21 is a rectangular beam that is set left and right and the left and right ends of which are set on the turnover seat 20 through a left and right rotating shaft), a plurality of short arms 23 (specifically, a channel steel that is open backwards) that are set side by side on the upside of the turnover frame 21 and left and right, a synchronizing bar 24 (specifically, a round bar) that is set on the lower part of all the short arms 23 through left and right rotation, a long arm 25 (specifically, a channel steel that is open backwards) that is set right and left on the upside of the turnover frame 21 and left and right, a plurality of sucker units 26 that are set side by side up and down on the front side of the long arm 25, an upper hinged plate 27 between the long arm 25 and the short arm 23, a lower hinged plate 28 between the long arm 25 and the synchronizing bar 24, two translation cylinders 29 (for synchronously driving the long arm 25 to the short arm 23), A turnover driving mechanism 210 for driving the turnover frame 21 to turn over, a supporting structure 22 for supporting the short arm 23, and the like. The turnover seat 20 is arranged between the glass placing frame 1 (for placing the glass 2, the glass 2 is vertically (slightly inclined forwards) arranged between the glass placing frame 1) and the conveying belt 3, and the turnover driving mechanism 210 is arranged behind the turnover frame 21. The short arms 23 and the conveyer belts 3 (a plurality of conveyer belts 3 are arranged side by side left and right and used for feeding or discharging) are arranged at intervals (two adjacent conveyer belts 3 can also be provided with a turning arm 215) and can be positioned between the two adjacent conveyer belts 3 (below) after being turned over, the long arms 25 are parallel to the glass 2 to be grabbed or the laminated glass 2 and extend upwards relative to the short arms 23, the upper hinge plate 27 and the lower hinge plate 28 are obliquely downwards arranged from front to back and are parallel to each other, and the upper hinge plate 27, the lower hinge plate 28, the lower parts of the long arms 25 and the short arms 23 form a parallelogram structure to realize translation. The upper and lower ends of the upper hinge plate 27 are hinged to the middle of the long arm 25 and the upper part of the short arm 23 (via left and right rotation shafts). The upper end of the lower hinge plate 28 is hinged (via a left-right pivot) to the lower portion of the long arm 25, and the lower end thereof is fixedly (vertically) connected to the synchronizing bar 24. The two translation cylinders 29 are respectively arranged on the two short arms 23 at the (left and right) sides. The translational cylinder 29 is arranged obliquely upwards from front to back, is hinged (through a left-right rotating shaft) at the back side of the short arm 23, and is hinged (through a left-right rotating shaft) at the front end of a telescopic rod with the long arm 25. All the suction cup units 26 are coplanar (parallel to the glass 2) and are driven synchronously to ensure smooth gripping (preferably the suction cups are arranged on an elastic structure), and the two translation cylinders 29 are driven synchronously. Wherein, the support structure 22 is provided with a cushion pad and is positioned right behind the short arm 23, and the short arm 23 is abutted against the support structure 22 when being overturned to the horizontal direction.

The use process of the device is as follows: the short arm 23 is parallel to the glass 2 to be gripped or to the glass 2 to be laminated when it is vertical, the long arm 25 can be moved back and forth close to or away from the glass 2 by the translation cylinder 29 (the suction cup unit 26 can suck or deflate air as required); the inversion driving mechanism 210 can invert the short arm 23 backward to be horizontal (in the front-rear direction when horizontal). When the short arm 23 is horizontal, the translation cylinder 29 can move the long arm 25 up and down to get close to or get away from the glass 2 (the suction cup unit 26 can suck or discharge air as required).

Specifically, when the device is used for feeding and grabbing, the suction cup unit 26 can move to the adjacent rear of the glass 2, the translation air cylinder 29 extends to enable the suction cup unit 26 to move forwards to the rear side face of the glass 2, and the suction cup unit 26 sucks air to grab the glass 2. The flip drive mechanism 210 can flip the short arm 23 backward to be horizontal. When the short arm 23 is turned to the horizontal, it is positioned between the conveyor belts 3 and arranged in the front-rear direction. The glass 2 on the suction cup unit 26 is positioned adjacently above the conveyor belt 3. The translation cylinder 29 is contracted and the long arm 25 abuts against the upper side of the short arm 23 and the suction cup unit 26 is deflated and brought down under the conveyor 3 to separate it from the glass 2. In the foregoing process, the glass placement frame 1 is stepped backward by a predetermined distance.

Specifically, when the device is used for discharging laminated materials, after the laminated materials are laminated, the suction cup unit 26 exhausts air, the translation air cylinder 29 contracts to separate the laminated materials from the glass 2, and the turning driving mechanism 210 enables the short arm 23 to turn backwards to be horizontal. When the short arm 23 is turned to the horizontal, it is positioned between the conveyor belts 3 and arranged in the front-rear direction, and the suction cup unit 26 is positioned below the conveyor belts 3. The glass 2 is conveyed to the position above the sucker unit 26 by the conveyer belt 3 and is abutted against a limiting structure (when the conveyer belt 3 is used for discharging, the front end of the conveyer belt 3 is provided with a reversible limiting structure, and when the glass is grabbed, the glass is turned to the position below the conveyer belt 3), the translational air cylinder 29 extends to enable the sucker unit 26 to move upwards to the lower side surface of the glass 2, the sucker unit 26 sucks air to grab the glass 2, and the turnover driving mechanism 210 turns forwards to stack; in the foregoing process, the glass placement frame 1 is moved forward stepwise by a predetermined distance.

Wherein, see fig. 2 and 3, the utility model provides an in the embodiment of the utility model the upset actuating mechanism 210 include driving motor 211, speed reducer 212 (along controlling to setting up, be located the below at feeding platform 3 middle part), two swing arms 213 (platelike structure), two connecting rods 214 (rod-like structure) and two upset arms 215 (specifically can be the open channel-section steel in back) etc. driving motor 211 and speed reducer 212 all locate the below of conveyer belt 3, speed reducer 212 is connected and all is followed to being equipped with the drive shaft about with driving motor 211 transmission and its left and right sides. The turning arm 215, the connecting rod 214 and the swing arm 213 are all perpendicular to the driving shaft of the speed reducer 212 and are all located between the two conveyor belts 3, and the lower ends of the two swing arms 213 are respectively fixedly connected with the driving shafts on the two sides of the speed reducer 212. The swing arm 213 is disposed obliquely upward from back to front, and its upper end is hinged to the lower end of a connecting rod 214 (via a left-right rotating shaft). The connecting rod 214 is disposed obliquely upward from back to front, and the upper end thereof is hinged (via a left-right pivot) to the upper end of the turning arm 215. The lower end of the turning arm 215 is fixedly connected with the upper side of the turning frame 21 and is positioned between two adjacent conveyor belts 3, and the turning arm is arranged side by side (left and right side by side) with the short arm 23 and is shorter than the short arm 23; two turning arms 215 are located on the left and right sides of the turning frame 21, respectively. Specifically, the link 214 and the swing arm 213 form a V shape (open downward, large angle), and the lengths of the flip arm 215, the link 214 and the swing arm 213 cooperate to ensure that the action of the present patent is achieved.

Preferably, referring to fig. 2, the two turning arms 215 and the two translation cylinders 29 in the embodiment of the present invention are arranged symmetrically left and right about the center of the turning frame 21 to ensure the synchronization.

Preferably, referring to fig. 2 and 3, the suction cup unit 26 in the embodiment of the present invention includes a fixing base 216 (specifically, a rectangular block, on which a through hole for the sliding rod 217 to pass through is formed), a sliding rod 217 slidably disposed in front of the fixing base 216 in the front-back direction, a suction cup 218 at the front end of the sliding rod 217, a spring 219 sleeved on the sliding rod 217, and the like, wherein the fixing base 216 is fixed on the long arm 25, the sliding rod 217 is perpendicular to the long arm 25, and an enlarged portion at the rear end of the sliding rod 217 abuts against the rear side of the fixing base 216, the spring 219 is disposed between the fixing base 216 and the suction cup 218, and the suction cup 218 is perpendicular to the sliding rod 217 and parallel. Furthermore, one of the suction cup units 26 is provided with a contact sensor for triggering after grabbing the stable glass 2, which is also provided on the elastic structure, and also on a sliding rod 217 (elastically and slidably provided on the corresponding fixed seat, in a similar manner as the suction cup 218) provided adjacent to and behind the suction cup 218.

Referring to fig. 1 and 2, in the embodiment of the present invention, a cylinder support 220 is disposed at the rear side of the short arm 23, and the translation cylinder 29 is hinged (via a left-right rotating shaft) to the cylinder support 220.

Wherein, the embodiment of the utility model provides an in the synchronizing bar 24 for the round bar and through the bearing with the forearm 23 rotate be connected, the rear side of upset arm 215 is equipped with the breach (specifically be the U-shaped breach) that supplies synchronizing bar 24 embedding in order to guarantee that upset arm 215 can overturn to the level.

Wherein, the upper hinge plate 27 and the lower hinge plate 28 in the embodiment of the present invention are both perpendicular to the synchronizing bar 24, and both are composed of two hinge plates (parallel to each other) that are arranged side by side and move synchronously; the two hinge plates are respectively positioned at the left and right sides of the corresponding short arm 23 and long arm 25.

Wherein, in the embodiment of the present invention, when grabbing the glass 2 or the laminated glass 2, the short arm 23 is set from front to back in a downward direction to ensure the grabbing effect and the laminated effect, and the inclination angle (the included angle with the vertical direction) is 8-15 °

Wherein, referring to fig. 1 and 2, the number of the short arms 23 in the embodiment of the present invention is 4, two turning arms 215 are respectively disposed between the two short arms 23 on the left side and between the two short arms 23 on the right side, each long arm 25 is provided with 3 suction cup units 26, and the 3 suction cup units 26 are respectively disposed on the upper end, the middle part and the lower end of the long arm 25.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A glass turnover device is characterized by comprising a turnover seat (20), a turnover frame (21) which is rotatably arranged on the turnover seat (20) and arranged along the left-right direction, a plurality of short arms (23) which are arranged on the upper side of the turnover frame (21) and arranged side by side left and right, a synchronizing rod (24) which is arranged along the left-right direction and is rotatably arranged on the lower parts of all the short arms (23), a long arm (25) which is right in front of the short arms (23) and is parallel to the short arms, a plurality of sucker units (26) which are arranged on the front side of the long arm (25) side by side up and down, an upper hinged plate (27) which is arranged between the long arm (25) and the short arms (23), a lower hinged plate (28) which is arranged between the long arm (25) and the synchronizing rod (24), two translation air cylinders (29), a turnover driving mechanism (210) which is used for driving the turnover frame (21) to turn over and a supporting structure (22) which is used for, the long arm (25) extends upwards relative to the short arm (23), the upper hinge plate (27) and the lower hinge plate (28) are obliquely and downwards arranged from front to back and are parallel to each other, and the upper end and the lower end of the upper hinge plate (27) are hinged with the middle part of the long arm (25) and the upper part of the short arm (23) respectively; the upper end of the lower hinged plate (28) is hinged with the lower part of the long arm (25), and the lower end of the lower hinged plate is fixedly connected with the synchronizing rod (24); the two translation cylinders (29) are respectively arranged on the two short arms (23) at the two sides; the translation cylinder (29) is obliquely and upwards arranged from front to back and is hinged to the rear side of the short arm (23), and the front end of a telescopic rod of the translation cylinder is hinged to the long arm (25); all the sucker units (26) are coplanar and synchronously driven, and the two translation cylinders (29) are synchronously driven;

when the short arm (23) is vertical, the short arm is parallel to the grabbed glass (2) or the laminated glass (2), and the translation cylinder (29) can enable the long arm (25) to move back and forth; the overturning driving mechanism (210) can enable the short arm (23) to be overturned backwards to be horizontal; when the short arm (23) is horizontal, the translation cylinder (29) can enable the long arm (25) to move up and down.

2. The glass turnover device of claim 1, wherein the turnover driving mechanism (210) comprises a driving motor (211), a speed reducer (212), two swing arms (213), two connecting rods (214) and two turnover arms (215), the speed reducer (212) is in transmission connection with the driving motor (211), driving shafts are arranged on the left side and the right side of the speed reducer (212) along the left-right direction, the turnover arms (215), the connecting rods (214) and the swing arms (213) are all perpendicular to the driving shafts of the speed reducer (212), and the lower ends of the two swing arms (213) are respectively fixedly connected with the driving shafts on the two sides of the speed reducer (212); the swing arm (213) is obliquely arranged upwards from back to front, and the upper ends of the swing arm are respectively hinged with the lower end of a connecting rod (214); the connecting rod (214) is obliquely and upwards arranged from back to front, and the upper end of the connecting rod is hinged with the upper end of the turnover arm (215); the lower end of the turning arm (215) is fixedly connected with the upper side of the turning frame (21), and the turning arm and the short arm (23) are arranged side by side and are shorter than the short arm (23); the two turning arms (215) are respectively positioned at two sides of the turning frame (21).

3. The glass turning device according to claim 2, characterized in that the two turning arms (215) and the two translational cylinders (29) are arranged in bilateral symmetry about the center of the turning frame (21).

4. The glass turnover device of claim 1, wherein the suction cup unit (26) comprises a fixed seat (216), a sliding rod (217) which is arranged on the front side of the fixed seat (216) in a sliding manner along the front-back direction, a suction cup (218) at the front end of the sliding rod (217) and a spring (219) which is sleeved on the sliding rod (217), the fixed seat (216) is fixed on the long arm (25), the sliding rod (217) is perpendicular to the long arm (25), the expanded part at the rear end of the sliding rod (217) abuts against the rear side of the fixed seat (216), the spring (219) is arranged between the fixed seat (216) and the suction cup (218), and the suction cup (218) is perpendicular to the sliding rod (217) and parallel to the grabbed glass (2) or the laminated glass (2).

5. The glass turnover device as claimed in claim 1, wherein the long arm (25) is provided with a strip-shaped hole along the vertical direction for the telescopic rod of the translation cylinder (29) to pass through and move.

6. The glass turnover device as claimed in claim 1, characterized in that a cylinder support (220) is provided at the rear side of the short arm (23), and the translational cylinder (29) is hinged to the cylinder support (220).

7. The glass turnover device as claimed in claim 2, wherein the synchronizing bar (24) is a round bar and is rotatably connected with the short arm (23) through a bearing, and the rear side of the turnover arm (215) is provided with a notch for the synchronizing bar (24) to be embedded in.

8. The glass turnover device as claimed in claim 1, wherein the upper hinge plate (27) and the lower hinge plate (28) are perpendicular to the synchronizing bar (24) and are composed of two hinge plates which are arranged side by side at left and right and move synchronously; the two hinged plates are respectively positioned at the left side and the right side of the corresponding short arm (23) and the long arm (25).

9. A glass-turnover device as claimed in claim 1, characterized in that the short arm (23) is arranged obliquely downwards from front to back in the gripping of the glass (2) or glass laminate (2), the angle of inclination being 8-15 °.

10. The glass turnover device of claim 2, wherein the number of the short arms (23) is 4, the two turnover arms (215) are respectively arranged between the two short arms (23) on the left side and between the two short arms (23) on the right side, each long arm (25) is provided with 3 sucker units (26), and the 3 sucker units (26) are respectively arranged at the upper end, the middle part and the lower end of the long arm (25).