CN111107909A

CN111107909A - Children marble game machine

Info

Publication number: CN111107909A
Application number: CN201880053952.6A
Authority: CN
Inventors: 宋占美; 潘宝城
Original assignee: Shandong Yingcai University
Current assignee: Shandong Yingcai University
Priority date: 2018-08-08
Filing date: 2018-08-08
Publication date: 2020-05-05
Also published as: WO2020029110A1

Abstract

A child marble game machine comprises a chassis (1), an upright post (2), a top block (3), a sliding post (4), a lifting assembly, a falling assembly, a first supporting block (46) and a first stop block (47); the lifting assembly comprises a vertical block (10), a bottom block (11), a top beam (12), a traction assembly, a second support block (7), a back block (6), a sliding block (5), a stop block (8), a limiting assembly and a hand-operated assembly; the automatic picking up, lifting and putting into track of marble have been realized through hand mode, and the simple operation has interestingly simultaneously very much.

Description

Children marble game machine

Technical Field

The utility model relates to a children marble game machine.

Background

In a child marble game machine, a plurality of tracks are often used for building a track line for rolling marbles, so that the marbles roll along the built track line, and the position combination among the plurality of tracks is changed to guide the marbles to roll; most of the existing pinball game machines for children need children to manually pick up pinballs and place the pinballs into a track, are troublesome in operation and lack of interest, cannot attract the attention of the children to the maximum extent and arouse the learning interest of the children, and are to be further improved.

SUMMERY OF THE UTILITY MODEL

To the current situation of above-mentioned prior art, the utility model aims to solve the technical problem that an automatic pick up, promotion and putting into the track that have realized the marble through hand mode is provided, has the interest when the simple operation, arouses children's attention and aroused children's interest in study greatly to the maximum extent, educates in the children's marble game machine of happy.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a child marble game machine comprises a chassis, upright columns, a top block, a sliding column, a lifting assembly, a falling assembly, a first support block and a first stop block, and is characterized in that the upright columns are vertically distributed and fixed on the upper plane of the chassis, grooves are formed in the upper sides of the upright columns, inclined planes are formed in the bottom surfaces of the grooves, the front parts of the inclined planes are high and the rear parts of the inclined planes are low, through holes which are distributed in an inclined mode are formed in the lower ends of the upright columns, through holes are formed in two sides of the inner walls of the through holes, and the through holes are arranged in a mode that the; the first supporting block is obliquely fixed on the rear plane of the upright column in a low-front and high-rear manner and is positioned below the rear opening of the through hole, first stop blocks which are vertically distributed are fixed on the left side of the first supporting block, and the front side surface of each first stop block is fixed on the rear plane of the upright column; the upper end of the upright post is also fixedly provided with a top block, the lower plane of the top block is fixedly inserted with vertically distributed sliding columns, and the sliding columns are connected with the lifting assembly; the falling assembly is arranged on the upright post.

Preferably, the lifting assembly comprises a vertical block, a bottom block, a top beam, a traction assembly, a second support block, a back block, a sliding block, a stop block, a limiting assembly and a hand-operated assembly; the vertical block is vertically fixed on the upper plane of the chassis, two sides of the lower end of the vertical block are respectively fixed with a bottom block, the lower ends of the two bottom blocks are respectively fixed on the upper plane of the chassis, the upper end of the vertical block is fixed with a top beam, two symmetrically distributed insertion blocks are outwards formed at the right end of the top beam, the top beam is connected with the back block through a traction assembly, and a second support block, a sliding block and a stop block are fixed on the rear plane of the back block; the sliding block and the stop block are respectively positioned at the left side and the right side of the second support block, and the sliding block is sleeved and connected on the sliding column and can slide up and down along the sliding column; the outer sides of the sliding block and the stop block are attached to the front side plane of the upright post; the traction assembly is connected with the hand-cranking assembly, and the hand-cranking assembly is further provided with a limiting assembly.

Preferably, the traction assembly comprises a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a seventh link, and an eighth link; one end of the first connecting rod and one end of the second connecting rod are respectively connected with the two sides of the top beam in a rotating connection mode, the other end of the first connecting rod is respectively connected with one end of a fourth connecting rod and one end of a fifth connecting rod in a rotating connection mode, one end of the third connecting rod is connected between the two insert blocks in a rotating connection mode, the other end of the third connecting rod is respectively connected with the other end of the fifth connecting rod and one end of the seventh connecting rod in a rotating connection mode, the other end of the second connecting rod is respectively connected with the other end of the seventh connecting rod and one end of the eighth connecting rod in a rotating connection mode, the other ends of the fourth connecting rod and the eighth connecting rod are connected with each other in a rotating connection mode and are simultaneously connected to the other side of the back block, and one end of the sixth connecting rod is connected to one side of the third connecting rod in a rotating connection mode.

Preferably, the hand cranking assembly comprises a rotating disc, a seat block, a rotating shaft, a swinging block and a handle; the seat block is vertically fixed on the upper plane of the chassis, a transversely-distributed rotating shaft is inserted and connected in the seat block in a rotating connection mode, the front end of the rotating shaft is inserted and fixed in the center of the end face of one side of the rotating disc, the other end of the sixth connecting rod is connected to the edge of the end face of the front side of the rotating disc in a rotating connection mode, a swinging block is fixedly sleeved on the rear end of the rotating shaft, and the other end of the swinging block is connected with a handle.

Preferably, the limiting assembly comprises a moving block, an eccentric wheel, a pull rod and a bolt; the eccentric wheel is eccentrically sleeved and fixed on the rotating shaft, the eccentric wheel is embedded and connected into the moving block in a rotating connection mode, one end of the pull rod is connected with the moving block, and the other end of the pull rod is connected to one end of the bolt in a rotating connection mode; the other end of the bolt is inserted into the through hole and can move back and forth along the through hole.

Preferably, the falling assembly comprises a short rod, a long rod, a first sliding plate, a first side plate, a second side plate, a first end plate, a second sliding plate, a third side plate, a fourth side plate, a second end plate, a third sliding plate, a fifth side plate, a sixth side plate, a third end plate, a fourth sliding plate, a seventh side plate, an eighth side plate and a fourth end plate; a first sliding plate which is distributed obliquely downwards is fixed on the rear side plane of the upright post, the left end of the first sliding plate is higher than the right end and is positioned below the inclined plane, a first side plate and a second side plate are respectively fixed on the side surfaces of the front side and the rear side of the first sliding plate, and the first side plate is positioned on the right side of the upright post; a first end plate is fixed between the second side plate and the rear side plane of the upright post, and the first end plate is positioned on the left side of the groove; the rear side plane of the second side plate is fixedly provided with a short rod and a long rod which are vertically distributed, and the lower ends of the short rod and the long rod are fixed on the upper plane of the chassis.

Preferably, a third side plate, a fifth side plate and a seventh side plate which are obliquely and downwardly distributed are fixed on the front sides of the short rod and the long rod from top to bottom; the third side plate is positioned below the second side plate; a second sliding plate which is distributed in a left-low-right-high manner is fixed on the front side plane of the third side plate, and a fourth side plate is fixed on the front side surface of the second sliding plate; and a second end plate is fixed between the third side plate, the fourth side plate and the right end of the second sliding plate.

Preferably, a third sliding plate which is distributed in a horizontal direction is fixed on the front side plane of the fifth side plate, and a sixth side plate is fixed on the front side surface of the third sliding plate; and a third end plate is fixed between the left end of the fifth side plate and the upright post.

Preferably, a fourth sliding plate with a left lower end and a right higher end is fixed on the front side plane of the seventh side plate, an eighth side plate is fixed on the front side surface of the fourth sliding plate, and a fourth end plate is fixed among the seventh side plate, the eighth side plate and the right end of the fourth sliding plate; the left end of the fourth sliding plate is attached to the right end of the first supporting block.

Compared with the prior art, the utility model has the advantages of: the utility model discloses a hand mode has realized that the automatic pickup of marble, promotion and putting into the track, has the interest in the simple operation, and children can observe the motion state of study lifting unit when observing the marble motion, arouses children's attention and aroused children's interest in study greatly to the at utmost, and the teaching in joy is educated.

Drawings

FIG. 1 is a front structural view of the present invention;

fig. 2 is a rear structure view of the present invention.

Detailed Description

As shown in fig. 1-2, a pinball game machine for children comprises a chassis 1, a vertical column 2, a top block 3, a sliding column 4, a lifting assembly, a falling assembly, a first supporting block 46 and a first stop block 47; the upper plane of the chassis 1 is fixed with upright posts 2 which are vertically distributed, the upper side of each upright post 2 is provided with a groove 201, the bottom surface of each groove 201 is provided with an inclined plane 202, the front part of each inclined plane 202 is high, the rear part of each inclined plane 202 is low, the lower end of each upright post 2 is provided with through holes 203 which are obliquely distributed, two sides of the inner wall of each through hole 203 are provided with through holes 204, and the front part of each through hole 204 is low; the first supporting block 46 is obliquely fixed on the rear plane of the upright 2 in a low-front and high-rear manner and is positioned below the rear opening of the through hole 204, the first stopping blocks 47 which are vertically distributed are fixed on the left side of the first supporting block 46, and the front side surfaces of the first stopping blocks 47 are fixed on the rear plane of the upright 2; the upper end of the upright post 2 is also fixed with a top block 3, the lower plane of the top block 3 is inserted and fixed with vertically distributed sliding columns 4, and the sliding columns 4 are connected with the lifting assembly; the lifting assembly comprises a vertical block 10, a bottom block 11, a top beam 12, a traction assembly, a second support block 7, a back block 6, a sliding block 5, a stop block 8, a limiting assembly and a hand-operated assembly; the vertical block 10 is vertically fixed on the upper plane of the chassis 1, two sides of the lower end of the vertical block 10 are respectively fixed with a bottom block 11, the lower ends of the two bottom blocks 11 are respectively fixed on the upper plane of the chassis 1, the upper end of the vertical block 10 is fixed with a top beam 12, two symmetrically distributed insertion blocks 121 are outwards formed at the right end of the top beam 12, the top beam 12 is connected with the back block 6 through a traction assembly, and a second support block 7, a sliding block 5 and a stop block 8 are fixed on the rear plane of the back block 6; the sliding block 5 and the stop block 8 are respectively positioned at the left side and the right side of the second supporting block 7, and the sliding block 5 is sleeved and connected on the sliding column 4 and can slide up and down along the sliding column 4; the outer sides of the sliding block 5 and the stop block 8 are attached to the front side plane of the upright post 2; the traction assembly is connected with the hand-cranking assembly, and the hand-cranking assembly is also provided with a limiting assembly; the traction assembly comprises a first connecting rod 13, a second connecting rod 14, a third connecting rod 15, a fourth connecting rod 16, a fifth connecting rod 17, a sixth connecting rod 18, a seventh connecting rod 19 and an eighth connecting rod 20; one end of the first connecting rod 13 and one end of the second connecting rod 14 are respectively connected to two sides of the top beam 12 in a rotating connection mode, the other end of the first connecting rod 13 is respectively connected with one end of the fourth connecting rod 16 and one end of the fifth connecting rod 17 in a rotating connection mode, one end of the third connecting rod 15 is respectively connected between the two insert blocks 121 in a rotating connection mode, the other end of the third connecting rod 15 is respectively connected with the other end of the fifth connecting rod 17 and one end of the seventh connecting rod 19 in a rotating connection mode, the other end of the second connecting rod 14 is respectively connected with the other end of the seventh connecting rod 19 and one end of the eighth connecting rod 20 in a rotating connection mode, the other ends of the fourth connecting rod 16 and the eighth connecting rod 20 are mutually connected in a rotating connection mode and are simultaneously connected to the other side of the back block 6, and one end of the sixth connecting rod 18 is connected to one side of the third connecting rod 15 in; the hand-cranking component comprises a rotary disc 21, a seat block 22, a rotating shaft 23, a swinging block 24 and a handle 25; the seat block 22 is vertically fixed on the upper plane of the chassis 1, the seat block 22 is inserted and connected with a rotating shaft 23 which is transversely distributed in a rotating connection mode, the front end of the rotating shaft 23 is inserted and fixed in the center of the end face of one side of the rotating disc 21, the other end of the sixth connecting rod 18 is connected to the edge of the end face of the front side of the rotating disc 21 in a rotating connection mode, the rear end of the rotating shaft 23 is sleeved and fixed with a swinging block 24, and the other end of the swinging block 24 is connected with a handle 25; the limiting assembly comprises a moving block 26, an eccentric wheel 27, a pull rod 28 and a bolt 29; the eccentric wheel 27 is eccentrically sleeved and fixed on the rotating shaft 23, the eccentric wheel 27 is embedded and connected inside the moving block 26 in a rotating connection mode, one end of the pull rod 28 is connected with the moving block 26, and the other end of the pull rod 28 is connected to one end of the bolt 29 in a rotating connection mode; the other end of the bolt 29 is inserted into the through hole 204 and can move back and forth along the through hole 204; a falling assembly is arranged on the upright 2, and comprises a short rod 9, a long rod 34, a first sliding plate 30, a first side plate 31, a second side plate 32, a first end plate 33, a second sliding plate 34, a third side plate 35, a fourth side plate 36, a second end plate 37, a third sliding plate 41, a fifth side plate 39, a sixth side plate 40, a third end plate 38, a fourth sliding plate 43, a seventh side plate 42, an eighth side plate 44 and a fourth end plate 45; a first sliding plate 30 which is distributed obliquely downwards is fixed on the rear side plane of the upright post 2, the left end of the first sliding plate 30 is higher than the right end and is positioned below the inclined plane 202, a first side plate 31 and a second side plate 32 are respectively fixed on the front side and the rear side of the first sliding plate 30, and the first side plate 31 is positioned on the right side of the upright post 2; a first end plate 33 is fixed between the second side plate 32 and the rear plane of the upright 2, and the first end plate 33 is positioned at the left side of the groove 201; the rear plane of the second side plate 32 is fixed with a short rod 9 and a long rod 34 which are vertically distributed, and the lower ends of the short rod 9 and the long rod 34 are fixed on the upper plane of the chassis 1; the front sides of the short rod 9 and the long rod 34 are fixed with a third side plate 35, a fifth side plate 39 and a seventh side plate 42 which are distributed obliquely downwards from top to bottom; the third side plate 35 is located below the second side plate 32; a second sliding plate 34 with a left lower part and a right higher part is fixed on the front plane of the third side plate 35, and a fourth side plate 36 is fixed on the front side surface of the second sliding plate 34; a second end plate 37 is fixed between the third side plate 35, the fourth side plate 36 and the right end of the second sliding plate 34; a third sliding plate 41 which is distributed in a left-high and right-low manner is fixed on the front side plane of the fifth side plate 39, and a sixth side plate 40 is fixed on the front side surface of the third sliding plate 41; a third end plate 38 is fixed between the left end of the fifth side plate 39 and the upright post 2; a fourth sliding plate 43 with a left lower part and a right higher part is fixed on the front plane of the seventh side plate 42, an eighth side plate 44 is fixed on the front side surface of the fourth sliding plate 43, and a fourth end plate 45 is fixed among the seventh side plate 42, the eighth side plate 44 and the right end of the fourth sliding plate 43; the left end of the fourth slide plate 43 is attached to the right end of the first holder 46.

When in use, the marble 48 is placed above the second support block 7 and between the sliding block 5 and the stop block 8, the handle 25 is held by hand and the swing block 24 is rotated, so as to drive the rotating shaft 23 and the rotating disc 21 to rotate, so as to drive the sixth connecting rod 18 to jack up the third connecting rod 15, further drive the fifth connecting rod 17 and the seventh connecting rod 19 to move upwards and rotate, so as to respectively move upwards and rotate through the fourth connecting rod 16 and the eighth connecting rod 20, further drive the sliding block 5 and the second support block 7 to ascend along the sliding column 4, and the first connecting rod 13 and the second connecting rod 14 also swing upwards along with the first connecting rod and the second connecting rod until the marble 48 on the second support block 7 ascends to the front side of the inclined plane 202 and rolls along the inclined plane 202 and further from left to right along the first sliding plate 30, then falls onto the second sliding plate 34 and is positioned at the left side of the second end plate 37, further rolls along the second sliding plate 34 from right to left until the marble falls onto the third sliding plate 41 and is positioned at the right side of, then, the marble 48 falls from the third slide plate 41 onto the fourth slide plate 43 and rolls down onto the first support block 46, and then enters the through hole 204, but is blocked by the bolt 29, so that the marble 48 stays inside the through hole 204, and is prevented from further falling, because in the process of rising the second support block 7, the rotation of the rotating shaft 23 drives the eccentric wheel 27 to rotate in the moving block 26, and further the bolt 29 is gradually pushed by the pull rod 28 to be inserted into the through hole 204, the marble 48 can be blocked; the handle 25 is further shaken to rotate the swinging block 24, so that the rotating shaft 23 and the rotating disc 21 are driven to rotate, the sixth connecting rod 18 is driven to pull down the third connecting rod 15, the fifth connecting rod 17 and the seventh connecting rod 19 are driven to move down and rotate, so that the fourth connecting rod 16 and the eighth connecting rod 20 respectively move down and rotate, the sliding block 5 and the second support block 7 are driven to descend along the sliding column 4 until the second support block 7 moves down below the front side of the through hole 203, the first connecting rod 13 and the second connecting rod 14 also swing down along with the first connecting rod and the second connecting rod, meanwhile, the bolt 29 is pulled leftwards away from the through hole 204 in the rotating process of the rotating shaft 23, and after the bolt 29 completely leaves the through hole 203, the marble 48 rolls forwards to the upper side of the second support block 7 in the inclined direction of the through hole 203 and continues to ascend along with the shaking of the handle 25, so as to form a.

In a child marble game machine, a plurality of tracks are often used for building a track line for rolling marbles, so that the marbles roll along the built track line, and the position combination among the plurality of tracks is changed to guide the marbles to roll; most of the existing pinball game machines for children need the children to manually pick up pinballs and place the pinballs into a track, are troublesome in operation and lack of interest, and cannot attract the attention of the children to the greatest extent and arouse the learning interest of the children; the utility model discloses a hand mode has realized that the automatic pickup of marble, promotion and putting into the track, has the interest in the simple operation, and children can observe the motion state of study lifting unit when observing the marble motion, arouses children's attention and aroused children's interest in study greatly to the at utmost, and the teaching in joy is educated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

A child marble game machine comprises a chassis, upright columns, a top block, a sliding column, a lifting assembly, a falling assembly, a first support block and a first stop block, and is characterized in that the upright columns are vertically distributed and fixed on the upper plane of the chassis, grooves are formed in the upper sides of the upright columns, inclined planes are formed in the bottom surfaces of the grooves, the front parts of the inclined planes are high and the rear parts of the inclined planes are low, through holes which are distributed in an inclined mode are formed in the lower ends of the upright columns, through holes are formed in two sides of the inner walls of the through holes, and the through holes are arranged in a mode that the; the first supporting block is obliquely fixed on the rear plane of the upright column in a low-front and high-rear manner and is positioned below the rear opening of the through hole, first stop blocks which are vertically distributed are fixed on the left side of the first supporting block, and the front side surface of each first stop block is fixed on the rear plane of the upright column; the upper end of the upright post is also fixedly provided with a top block, the lower plane of the top block is fixedly inserted with vertically distributed sliding columns, and the sliding columns are connected with the lifting assembly; the falling assembly is arranged on the upright post.
The children's pinball game machine according to claim 1, wherein the lifting assembly comprises a standing block, a bottom block, a top beam, a traction assembly, a second support block, a back block, a slide block, a stop block, a limiting assembly and a hand-operated assembly; the vertical block is vertically fixed on the upper plane of the chassis, two sides of the lower end of the vertical block are respectively fixed with a bottom block, the lower ends of the two bottom blocks are respectively fixed on the upper plane of the chassis, the upper end of the vertical block is fixed with a top beam, two symmetrically distributed insertion blocks are outwards formed at the right end of the top beam, the top beam is connected with the back block through a traction assembly, and a second support block, a sliding block and a stop block are fixed on the rear plane of the back block; the sliding block and the stop block are respectively positioned at the left side and the right side of the second support block, and the sliding block is sleeved and connected on the sliding column and can slide up and down along the sliding column; the outer sides of the sliding block and the stop block are attached to the front side plane of the upright post; the traction assembly is connected with the hand-cranking assembly, and the hand-cranking assembly is further provided with a limiting assembly.
The child hoodle game system of claim 2, wherein the traction assembly includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a seventh link, and an eighth link; one end of the first connecting rod and one end of the second connecting rod are respectively connected with the two sides of the top beam in a rotating connection mode, the other end of the first connecting rod is respectively connected with one end of a fourth connecting rod and one end of a fifth connecting rod in a rotating connection mode, one end of the third connecting rod is connected between the two insert blocks in a rotating connection mode, the other end of the third connecting rod is respectively connected with the other end of the fifth connecting rod and one end of the seventh connecting rod in a rotating connection mode, the other end of the second connecting rod is respectively connected with the other end of the seventh connecting rod and one end of the eighth connecting rod in a rotating connection mode, the other ends of the fourth connecting rod and the eighth connecting rod are connected with each other in a rotating connection mode and are simultaneously connected to the other side of the back block, and one end of the sixth connecting rod is connected to one side of the third connecting rod in a rotating connection mode.
The children's pinball game machine according to claim 2, wherein the hand cranking assembly comprises a turntable, a seat block, a rotating shaft, a swinging block and a handle; the seat block is vertically fixed on the upper plane of the chassis, a transversely-distributed rotating shaft is inserted and connected in the seat block in a rotating connection mode, the front end of the rotating shaft is inserted and fixed in the center of the end face of one side of the rotating disc, the other end of the sixth connecting rod is connected to the edge of the end face of the front side of the rotating disc in a rotating connection mode, a swinging block is fixedly sleeved on the rear end of the rotating shaft, and the other end of the swinging block is connected with a handle.
The children's pinball game machine according to claim 2, wherein the limit component comprises a moving block, an eccentric wheel, a pull rod and a bolt; the eccentric wheel is eccentrically sleeved and fixed on the rotating shaft, the eccentric wheel is embedded and connected into the moving block in a rotating connection mode, one end of the pull rod is connected with the moving block, and the other end of the pull rod is connected to one end of the bolt in a rotating connection mode; the other end of the bolt is inserted into the through hole and can move back and forth along the through hole.
The children's pinball game of claim 1, wherein the drop assembly comprises a short bar, a long bar, a first slide plate, a first side plate, a second side plate, a first end plate, a second slide plate, a third side plate, a fourth side plate, a second end plate, a third slide plate, a fifth side plate, a sixth side plate, a third end plate, a fourth slide plate, a seventh side plate, an eighth side plate, and a fourth end plate; a first sliding plate which is distributed obliquely downwards is fixed on the rear side plane of the upright post, the left end of the first sliding plate is higher than the right end and is positioned below the inclined plane, a first side plate and a second side plate are respectively fixed on the side surfaces of the front side and the rear side of the first sliding plate, and the first side plate is positioned on the right side of the upright post; a first end plate is fixed between the second side plate and the rear side plane of the upright post, and the first end plate is positioned on the left side of the groove; the rear side plane of the second side plate is fixedly provided with a short rod and a long rod which are vertically distributed, and the lower ends of the short rod and the long rod are fixed on the upper plane of the chassis.
The children's pinball game machine according to claim 6, wherein the front side of the short and long rods is fixed with a third side plate, a fifth side plate and a seventh side plate which are distributed obliquely downwards from top to bottom; the third side plate is positioned below the second side plate; a second sliding plate which is distributed in a left-low-right-high manner is fixed on the front side plane of the third side plate, and a fourth side plate is fixed on the front side surface of the second sliding plate; and a second end plate is fixed between the third side plate, the fourth side plate and the right end of the second sliding plate.
The children's pinball game machine according to claim 7, wherein a third sliding plate with a left-high and a right-low distribution is fixed on the front side plane of the fifth side plate, and a sixth side plate is fixed on the front side surface of the third sliding plate; and a third end plate is fixed between the left end of the fifth side plate and the upright post.
The children's pinball game machine according to claim 7, wherein a fourth sliding plate with a left-lower right-height distribution is fixed on the front side plane of the seventh side plate, an eighth side plate is fixed on the front side surface of the fourth sliding plate, and a fourth end plate is fixed between the seventh side plate, the eighth side plate and the right end of the fourth sliding plate; the left end of the fourth sliding plate is attached to the right end of the first supporting block.