JP4076209B2 - Impact force mitigation device for pitcher for baseball practice - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
  According to the present invention, a pitching arm projecting from a rotating shaft is rotated at a high speed around the axis of the rotating shaft, so that a ball placed on the projecting end of the pitching arm is practiced for hitting. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact force alleviating device for reducing an impact force generated as a reaction force at the time of pitching in a pitching machine such as an arm-type pitching machine for baseball practice that is allowed to pitch a batter.
[0002]
[Prior art]
  Conventionally, there is a pitcher disclosed in Japanese Patent Application Laid-Open No. 10-113413.
[0003]
  According to the above publication, the pitcher can throw a cart that can move on the ground and balls that are supported by the cart via a shock absorber and are supplied one by one from the outside toward the front. And a ball supply member capable of supplying the balls one by one to the pitcher body. The carriage includes a chassis that supports the pitcher body by placing it on the ground, and wheels that are supported by the chassis and support the chassis on the ground.
[0004]
  The pitcher body includes a support base attached to the carriage, a rotary shaft supported so as to be rotatable about an axis extending to the left and right with respect to the support base, and a radial direction from the rotary shaft. A throwing arm that protrudes outward and allows a ball to be placed on the ball receiving portion of the protruding end, and the throwing arm in a first posture that protrudes rearward from the turning shaft is above the turning shaft. A coil spring that urges the throwing arm to rotate forward at a high speed until it reaches a second posture that protrudes forward from the pivot shaft, and the throw arm in the second posture is below the pivot shaft. Driving means for rotating the pitching arm in a reverse direction while resisting the urging force of the spring until the first posture is returned.
[0005]
  The spring is installed on an urging arm projecting from a rotating shaft supported by the support base and the support base. The drive means includes an electric motor supported by the support base and interlocking means for interlockingly connecting the rotating shaft to the electric motor.
[0006]
  Then, when the throwing arm is rotated backward by driving the electric motor of the driving means, and then the throwing arm is rotated forward at a high speed, the ball placed on the ball receiving portion moves forward. The ball is thrown in the direction, and the batter can perform batting practice on the ball thus thrown.
[0007]
  In addition, when the pitching arm of the pitcher body moves forward and throws a ball, an impact force is applied to the pitcher body as a reaction force during the pitching. Is relaxed by the shock absorber.
[0008]
[Problems to be solved by the invention]
  However, when the pitcher main body is pitched, the pitcher main body tends to swing (including vibrations) about the shock absorber by the impact force which is the reaction force. Here, as described above, the pitcher main body includes the pitching arm protruding from the rotation shaft and the driving means. Therefore, the pitcher main body is given a large impact force every time it is thrown. If it is swung rapidly, there is a possibility that a mechanical life problem may occur in the pitcher body, which is not preferable.
[0009]
  On the other hand, there are various types of the pitchers, and the impact force is more effectively mitigated because there is a difference in performance such as the weight of the pitcher main body and the ball speed by the pitcher main body. Therefore, conventionally, a shock absorber having a desired characteristic is provided for each pitcher.
[0010]
  For this reason, if various pitchers are seen as a whole, the types of the shock absorbers are increased, and the management of the parts is extremely complicated.
[0011]
  The present invention has been made paying attention to the above situation, and when the pitcher body of the pitcher throws a ball, even if an impact force generated as a reaction force is given to this pitcher body, It is an object of the present invention to improve the life of the pitcher body by preventing the mechanical life from being problematic.
[0012]
  Another object of the present invention is to make it easy to manage parts for the shock absorbers of each pitcher when the impact force is effectively reduced by the shock absorbers in various pitchers.
[0013]
[Means for Solving the Problems]
  The impact force alleviating device in the baseball practice pitcher of the present invention for solving the above problems is as follows. In addition, the code | symbol attached | subjected to each term in this term does not limit and interpret the technical scope of this invention to the content of the term of the "embodiment of invention" mentioned later.
[0014]
  The invention of claim 1The groundA carriage 3 that is movable on the surface 2; and a pitcher body 5 that is supported by the carriage 3 and that allows balls 4 supplied one by one from the outside to be sequentially thrown forward. In a baseball practice pitcher comprising a chassis 9 for placing and supporting the pitcher body 5 and wheels 10 supported by the chassis 9 and supporting the chassis 9 on the ground 2.
[0015]
  A shock absorber 67 is interposed between the chassis 9 of the carriage 3 and the wheel 10,
[0016]
  The shock absorber 67 isExtending in the front-rear direction of the pitcher 1,A lever 68 for supporting a part of the pitcher body 5 or the chassis 9 and a part 68 for supporting the wheel 10 is supported by a portion in the longitudinal direction so as to be rotatable around a pivot axis 69 extending in a substantially horizontal direction. A cushioning material 72 interposed between the other part of the lever 68 and any one of the pitcher body 5 and the chassis 9 is provided.,
[0017]
  In the front-rear direction of the pitcher 1, the grounding point of the wheel 10 on the ground 2 is positioned outside the chassis 9, and the position of the part of the lever 68 can be changed to an arbitrary position in the longitudinal direction.
[0018]
  UpThe lever ratio between the linear distance L1 from the part of the lever 68 to the other part and the linear distance L2 from the part of the lever 68 to the further part is variable.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
  1 to 7, reference numeral 1 denotes an arm-type baseball practice pitcher, and an arrow Fr indicates the front of the pitching direction by the pitcher 1, and the following left and right refer to the direction toward the front. And
[0021]
  The pitcher 1 can sequentially throw a cart 3 that is movable in a desired direction on a ground 2 for baseball practice, and balls 4 that are supported by the cart 3 and supplied one by one from the outside toward the front. And a ball supply member 6 that can supply the balls 4 to the pitcher body 5 one by one.
[0022]
  The carriage 3 includes a chassis 9 on which the pitcher body 5 is placed and supported, and a pair of left and right wheels 10 and 10 that are supported on the front and rear of the chassis 9 and are made of rubber and have a buffer function, The chassis 9 is supported on the ground 2 by these wheels 10 so as to be movable. The chassis 9 includes a base 11 supported on the ground 2 by the wheels 10, and is disposed in the vicinity of the top of the base 11 so as to extend substantially horizontally, and has one end (rear end) in the front-rear direction. The other end (front end) of the pitcher 1 is pivotally supported on the base 11 by the pivot shaft 12 so that it can swing freely up and down, and in a side view of the pitcher 1 (FIG. 1). A screw jack 14 for supporting the swing base 13 on the base 11 so that the swing base 13 has a desired inclination angle with respect to a horizontal plane and one end (rear end) of the base 11 are projected. And a fixed handle 17 for hand pushing.
[0023]
  The pitcher body 5 includes a support base 20 that is detachably fastened to a front upper surface of the swing base 13 of the chassis 9 of the carriage 3 by a fastener 19, and extends to the left and right with respect to the support base 20. A rotation shaft 23 supported by a pair of left and right bearings 22 so as to be rotatable around an axis 21 and a pitching arm 24 projecting radially outward from the rotation shaft 23 are provided. .
[0024]
  The pitching arm 24 constitutes a base side of the pitching arm 24 and projects a pitching arm main body 26 protruding from the rotating shaft 23, and constitutes a projecting end of the pitching arm 24 to constitute the pitching arm main body 26. And a ball receiving portion 27 that is integrally formed with the protruding end portion of the sphere 4 and on which the ball 4 can be placed.
[0025]
  In the pitcher 1, the pitching arm 24 in a “first posture” (a one-dot chain line in FIG. 2) that protrudes rearward and upward from the rotation shaft 23 passes above the rotation shaft 23. The throwing arm 24 and the pivot shaft 23 are elastically moved so that the throwing arm 24 is rotated B at a high speed until it reaches a “second posture” projecting forward and downward from FIG. Until the coil arm 28 in the “second posture” returns to the “first posture” below the rotating shaft 23 while resisting the biasing force of the spring 28. A driving means 29 for rotating the pitching arm 24 and the rotation shaft 23 is provided so as to cause the pitching arm 24 to rotate backward C, and is mounted on the ball receiving portion 27 by the forward rotation B of the pitching arm 24. The placed ball 4 is thrown D forward.
[0026]
  In the above case, during the backward rotation C of the pitching arm 24, the pitching arm 24 becomes a “ball placement posture” (solid line in FIG. 2) that protrudes substantially horizontally toward the rear from the rotation shaft 23. Then, one sphere 4 is supplied from the sphere supply member 6 and placed on the upper surface of the sphere receiving portion 27.
[0027]
  When viewed from the “ball placement posture” of the pitching arm 24, the ball receiving portion 27 has an upper surface that slightly inclines downward toward the rotating shaft 23, and the ball is placed on the upper surface. A ball receiving portion main body 32 that allows the ball 4 supplied from the supply member 6 to be placed thereon, and the ball receiving portion main body 32 that is attached to a portion on the rotating shaft 23 side of the ball receiving portion main body 32 and placed on the ball receiving portion main body 32. And a stopper 33 for preventing the ball 4 from rolling beyond a predetermined position toward the rotating shaft 23.
[0028]
  In the longitudinal direction of the pitching arm 24 (substantially the radial direction of the rotation shaft 23), the position of the stopper 33 is adjustable to an arbitrary position. More specifically, a plurality of bolt insertion holes 35 are formed at a predetermined equal pitch along the longitudinal direction of the pitching arm 24 in the portion on the rotating shaft 23 side of the ball receiving body 32. The stopper 33 includes a bolt member 37 that is selectively inserted into any one of the bolt insertion holes 35 and fastened to the ball receiving portion main body 32 by a nut 36. The position is adjusted. In this case, the bolt insertion hole 35 may be a female screw hole, and the bolt member 37 may be screwed into the bolt insertion hole 35 and fastened.
[0029]
  The configuration relating to the spring 28 will be described more specifically. A biasing arm 39 projects from the rotating shaft 23 outward in the radial direction. One end of the spring 28 is connected to the protruding end of the urging arm 39 by a connector 40, and the other end of the spring 28 is connected to the swing base 13 of the chassis 9 of the carriage 3 by another connector 41. It is connected.
[0030]
  The connector 40 is positioned eccentric from the axis 21 of the rotating shaft 23 and around an axis parallel to the axis 21, one end of the spring 28, the biasing arm 39, These 28 and 39 are pivotally connected to each other so as to be relatively rotatable.
[0031]
  The other connecting tool 41 includes a pivot arm 44 that can be pivoted up and down by a pivot 43 on the swing base 13 of the chassis 9 of the carriage 3, and the pivot arm 44 at an arbitrary pivot position. And the other end of the spring 28 is connected to a midway portion of the rotating arm 44 in the longitudinal direction. Then, as shown by the solid line in FIGS. 2 to 4 or the alternate long and short dash line in FIG. 2, if the rotating arm 44 is locked to the locking tool 45 at a desired rotating position, the pitching arm 24 is The biasing force of the spring 28 is adjustable.
[0032]
  The driving means 29 includes an electric motor 49 with a speed reducer that is detachably fastened to and supported by the support base 20 by a fastener 48, and the electric motor 49 interlocks the rotation shaft 23 and the pitching arm 24. The interlocking means 50 which is a chain winding means is provided.
[0033]
  When the electric motor 49 is driven, the push pin 51 of the interlocking means 50 integrally rotates the rotation shaft 23 and the pitching arm 24, and accordingly, the pitching arm 24 is rotated backward C. It has become. When the pitching arm 24 is rotated backward C and exceeds the “first posture”, the pivot shaft 23 and the pitching arm 24 are moved at high speed by the biasing force of the spring 28 regardless of the interlocking means 50. It is made to rotate B.
[0034]
  The support base 20 is a rectangular parallelepiped box 52 that opens downward, and the lower end of the box 52 is fastened to and supported by the swing base 13 of the chassis 9 of the carriage 3 by a fastener 19. Yes. Inside the box body 52, the middle part in the axial direction of the rotating shaft 23, each bearing 22, and the electric motor 49 are accommodated, and the middle part in the axial direction of the rotating shaft 23 is supported on the upper part of the box body 52. Has been.
[0035]
  On the outer side of the box 52, the pitching arm 24 protrudes from one end of the rotating shaft 23, and the driven side of the interlocking means 50 is supported. The ball supply member 6 is arranged. Further, the biasing arm 39 protrudes from the other end portion of the rotating shaft 23 on the outer side of the box 52, and the spring 28 and other members are provided in the rear area of the other end portion of the rotating shaft 23. A connector 41 is disposed.
[0036]
  An opening 53 is formed over substantially the entire rear surface of the box body 52, and a lid body 54 is provided to open and close the opening 53 from the outside behind the box body 52. The lid body 54 is provided with the box body. It is detachably fastened by an opening edge of the opening 53 of the 52 and a fastener 55. If the opening 53 is opened, the bearings 22 and the electric motor 49 can be inserted into and removed from the box 52 through the opening 53.
[0037]
  The ball supply member 6 is attached to the upper surface of the rear portion of the swing base 13 of the vehicle base 9 of the carriage 3 by being detachably fastened by a fastener 58, and can hold only one ball 4 on the upper surface. A base 59 and a supply chute 60 that is supported by the ball receiver 59 and that can supply the balls 4 one by one to the upper surface of the ball receiver 59 are provided.
[0038]
  When the ball 4 is thrown D by the pitcher 1, first, the ball 4 is supplied to the supply chute 60 of the ball supply member 6 and one ball 4 is held on the upper surface of the ball receiving table 59. Next, the driving means 29 is driven to cause the pitching arm 24 to rotate backward C. The ball receiving portion 27 of the pitching arm 24 is held on the upper surface of the ball receiving base 59 of the ball supply member 6 in the “ball mounting posture” in the middle of the backward rotation C of the pitching arm 24. The sphere 4 is scooped up, whereby one sphere 4 is placed on the upper surface of the sphere receiving portion 27 from the sphere supply member 6. Then, after the ball 4 rolls on the ball receiving portion main body 32 of the ball receiving portion 27 toward the rotating shaft 23, further rolling is prevented by the stopper 33. Thereby, the mounting distance E from the center of the sphere 4 to the free end of the sphere receiving body 32 is set to a predetermined dimension.
[0039]
  When the pitching arm 24 is further rotated backward C by the driving means 29 and exceeds the “first posture”, the pitching arm 24 is rotated forward B at a high speed by the biasing force of the spring 28. The ball 4 biased by the forward rotation B is thrown D forward.
[0040]
  After the above-mentioned pitching D, the pitching arm 24 is rotated forward B to the “second posture”, and then rotated again C. Thereafter, the pitching of the pitcher main body 5 of the pitcher 1 is performed. The operation is repeated.
[0041]
  In the above case, if the inclination angle of the swing base 13 is adjusted by operating the screw jack 14, the direction of the pitch D by the pitcher body 5 can be adjusted to be high or low. Also, if the urging force of the spring 28 is adjusted by moving the rotation arm 44 of the other connector 41 to a desired rotation position, the speed of the throwing arm 24 during the forward rotation B is adjusted, The speed of the pitch D is adjusted.
[0042]
  Further, the position of the stopper 33 is adjusted to a desired position, and the ball receiving portion main body from the center of the ball 4 placed on the ball receiving portion main body 32 of the ball receiving portion 27 and prevented from rolling by the stopper 33. If the mounting distance E to 32 free ends is adjusted, the following ball types can be obtained. That is, if the placement distance E is shortened (or lengthened), the ball 4 placed on the ball receiving portion 27 is moved to an early eye (or delayed) when the pitching arm 24 rotates B at high speed. The ball receiving unit 27 releases the ball 4 so that the elevation angle in the pitching direction of the ball 4 from the pitcher body 5 increases (or decreases), and the pitched ball 4 has a velocity. It draws a parabola that is slow and has a large bend (or a little faster and a small bend).
[0043]
  That is, if the above adjustments are combined in various ways, it is possible to select various sphere types such as the height of the sphere 4 when reaching the target area, the speed of the sphere, and the magnitude of the parabolic curve. When the ball 4 is to be practiced for hitting, the desired hitting practice can be performed by selecting the above-mentioned ball type.
[0044]
  1 to 3, a shock absorber 67 is interposed between the front end of the base 11 of the chassis 9 of the carriage 3 and the front wheel 10 of the front and rear wheels 10. The shock absorber 67 includes a lever 68 that linearly extends in the front-rear direction. The middle part which is a “part” of the longitudinal direction is a part of the longitudinal direction of the lever 68 so that the longitudinal front and rear ends of the lever 68 can be pivoted up and down about a pivot axis 69 extending in the horizontal direction substantially horizontally. 9 is pivotally supported by a pivot shaft 70 at the front end of the base 11.
[0045]
  The front wheel 10 is supported by an axle 71 on one rotating end (front end) of the front and rear rotating ends that are “other parts” of the lever 68. The shock absorber 67 is interposed between the other rotating end portion (rear end portion) of the lever 68 and the base 11 portion of the chassis 9. A cushioning material 72, which is an elastic body, is provided, and the grounding point of each front wheel 10 to the ground 2 is positioned in front of the chassis 9.
[0046]
  The buffer material 72 is a coil spring, and one end portion (lower end portion) of the buffer material 72 is hooked to the other end portion of the lever 68 by a hooking body 74, and the other end portion of the buffer material 72 is The (upper end) is hooked to the base 11 of the chassis 9 by another engagement body 75, and the cushioning material 72 supports the loads of the pitcher body 5 and the chassis 9 by tensile stress. .
[0047]
  The lever 68 is formed with a plurality of holes 77 at predetermined equal intervals in the longitudinal direction. By selecting any one of these holes 77 and inserting the pivot shaft 70, the base of the chassis 9 is formed. The “part” (halfway portion) of the lever 68 with respect to the base 11 can be changed in position to an arbitrary position in the longitudinal direction. This position conversion is, for example, as shown by a three-dot chain line in FIG.
[0048]
  The engaging body 74 is a locking pin, and by selecting any of the holes 77 and inserting the engaging body 74, one end of the cushioning material 72 with respect to the other end of the lever 68 is provided. The position of the latching portion can be changed to an arbitrary position in the front-rear direction, that is, the “other portion” of the lever 68 can be changed in the longitudinal direction of the lever 68.
[0049]
  Further, the other engagement body 75 is detachably attached to the base 11 of the chassis 9 by a fastener, and by this attachment / detachment, the other engagement body 75 is placed at an arbitrary position in the front-rear direction with respect to the base 11 of the chassis 9. The position can be changed, whereby the hooking portion of the other end of the cushioning material 72 with respect to the base 11 of the chassis 9 can be converted to an arbitrary position in the front-rear direction.
[0050]
  By each of the above-described position conversions, a linear distance L1 from the “part” (intermediate part) of the lever 68 to the “other part” (axial center of the axle 71 that is the support point of the wheel 10), and the lever 68 The lever ratio (L1 / L2) with the linear distance L2 from the “part” (midway part) to the engaging part (joint part with the buffer material 72) that is the above “further part” is variable. Has been.
[0051]
  According to the above configuration, the cart 3 that is movable on the ground 2, and the pitcher main body 5 that allows the balls 4 that are supported by the cart 3 and supplied from the outside one by one to be sequentially thrown forward. With
[0052]
  The carriage 3 includes a chassis 9 for placing and supporting the pitcher body 5 and a pair of left and right front and rear wheels 10 supported by the chassis 9 and supporting the chassis 9 on the ground 2.
[0053]
  The pitcher body 5 is supported by a support base 20 attached to the carriage 3, a rotary shaft 23 supported to be rotatable about an axis 21 extending to the left and right with respect to the support base 20, and the rotation A throwing arm 24 that protrudes outward in the radial direction from the shaft 23 and allows the ball 4 to be placed on the ball receiving portion 27 at the protruding end, and a first posture that protrudes rearward from the rotating shaft 23. A coil spring that urges the throwing arm 24 to rotate forward B at a high speed until the throwing arm 24 passes through the rotating shaft 23 and protrudes forward from the rotating shaft 23. 28 and until the throwing arm 24 in the second posture passes below the pivot shaft 23 and returns to the first posture, the throwing arm 24 is rotated backward C against the urging force of the spring 28. Drive means 29 for rotating,
[0054]
  In an arm-type pitcher for baseball practice in which the ball 4 placed on the ball receiving portion 27 is thrown forward D by the forward rotation B of the pitching arm 24,
[0055]
  A shock absorber 67 is interposed between the chassis 9 of the carriage 3 and the wheels 10.
[0056]
  For this reason, the pitcher 67 is divided into the pitcher body 5, the chassis 9 of the carriage 3 that supports the pitcher body 5, and the wheels 10 of the carriage 3.
[0057]
  Therefore, when the pitching arm 24 of the pitcher body 5 moves forward B and throws the ball 4, the pitcher body 5 is substantially centered on the shock absorber 67 due to the impact force generated as a reaction force at the time of pitching. However, according to the above configuration, since the weights of both the pitcher body 5 and the chassis 9 of the carriage 3 oppose the impact force, the shock absorber Oscillation of the pitcher main body 5 about 67 as a center is suppressed to be small, damage due to this oscillation is prevented, and in this state, the impact force is relieved by the shock absorber 67. As a result, the life of the pitcher main body 5 is improved, and this effect is particularly remarkable in the arm-type pitcher 1 having a large impact force at the time of pitching.
[0058]
  Further, as described above, a “part” (midway portion) in the longitudinal direction is pivotally supported by the chassis 9 so that the shock absorber 67 can be rotated around the pivot axis 69 extending in the substantially horizontal direction. One of the rotating ends that is the “other part” is a lever 68 that supports the wheel 10, a “further part” (the other rotating end) of the lever 68, and the above And a cushioning material 72 interposed between the chassis 9 and the vehicle body 9.
[0059]
  For this reason, the amount of impact force applied to the cushioning material 72 via the pitcher body 5 and the lever 68 of the shock absorber 67 can be increased or decreased depending on the lever ratio of the lever 68. The shock absorber 67 can have a desired characteristic, and the shock absorber 67 can obtain a desired relaxation state with respect to the impact force.
[0060]
  Therefore, the improvement of the lifetime of the pitcher body 5 is achieved more reliably. Further, since the shock absorber 67 can be applied to various pitchers 1 to achieve desired characteristics, the shock absorbers 67 having different characteristics are provided for each pitcher 1 as in the prior art. The parts management for the shock absorber 67 of each pitcher 1 can be easily performed as much as it is not necessary.
[0061]
  In addition, the contact point of the front wheel 10 to the ground 2 is positioned ahead of the chassis 9.
[0062]
  For this reason, the pitcher 1 is supported in a more stable state with respect to the ground 2 as compared with the case where the grounding point of the front wheel 10 is simply positioned at the same position as the chassis 9 in the front-rear direction.
[0063]
  Therefore, since the swing of the pitcher main body 5 due to the reaction force when the pitcher main body 5 throws the ball 4 is suppressed to a small extent and damage due to this swing is prevented, this pitcher main body An increase in service life of 5 is more reliably achieved.
[0064]
  Further, as described above, from the “part” (intermediate portion) of the lever 68 to the linear distance L1 from the “other portion” (support point of the wheel 10) to the “part” (intermediate portion) of the lever 68, The lever ratio with the linear distance L2 reaching the “further part” (engagement part with the buffer material 72) is variable.
[0065]
  Therefore, according to the shock absorber 67, it is easy to change the lever ratio in order to obtain a desired relaxation state with respect to the impact force to the pitcher body 5, and the lever ratio Since the impact is variable, the impact force can be more effectively mitigated, and thus the life of the pitcher body 5 can be improved more reliably.
[0066]
  In addition, as shown by a one-dot chain line or a two-dot chain line in FIG. 1, various parts of the chassis 9 in which the cushioning material 72 is interposed in cooperation with the lever 68 can be selected. The cushioning material 72 supports the load of the pitcher body 5 and the chassis 9 of the carriage 3 by compressive stress.
[0067]
  Moreover, although the above is based on the illustrated example, the pitcher main body 5 may be one in which the ball 4 is thrown between both rotating wheels that rotate in reverse to each other. Further, a shock absorber 67 may be provided between the chassis 9 of the carriage 3 and the rear wheel 10. In this case, the grounding point of the rear wheel 10 with respect to the ground 2 is located behind the chassis 9. May be.
[0068]
  Furthermore, the “part” of the lever 68 is one of the rotating end portions of the lever 68 and the “other portion” supporting the wheel 10 is the other rotating end portion. 68 may be a midway portion in the longitudinal direction of the lever 68. The cushioning material 72 may be an elastic body such as rubber or a leaf spring, or may be of a hydraulic or pneumatic cylinder type.
[0069]
  The “part” of the lever 68 may be pivotally supported on the pitcher body 5, and the cushioning material 72 is interposed between the “further part” of the lever 68 and the part of the pitcher body 5. May be set.
[0070]
【The invention's effect】
  BookThe effects of the invention are as follows.
[0071]
  The invention of claim 1 includes a carriage that is movable on the ground, and a pitcher main body that is capable of throwing balls that are supported by the carriage and that are supplied one by one from the outside sequentially forward. In the baseball practice pitcher, the carriage includes a chassis that supports the pitcher body by placing it, and wheels that are supported by the chassis and support the chassis on the ground.
[0072]
  A shock absorber is interposed between the chassis of the carriage and the wheels.
[0073]
  For this reason, on the basis of the shock absorber, the pitcher main body, the base of the cart supporting the pitcher main body, and the wheels of the cart are divided.
[0074]
  Therefore, when the pitcher main body throws a ball, the pitcher main body tends to swing rapidly around the shock absorber by the impact force generated as a reaction force at the time of pitching. According to the above, since the weight of both the pitcher body and the carriage chassis against the impact force, the swing of the pitcher body about the shock absorber is suppressed to be small, Damage due to this swinging is prevented, and in this state, the impact force is alleviated by the shock absorber. As a result, the life of the pitcher main body is improved.
[0075]
  In addition, the shock absorber isExtending in the front-rear direction of the pitcher,A part of the longitudinal direction is pivotally supported by the pitcher main body or the chassis so as to be rotatable around a pivot axis that extends in a substantially horizontal direction, and a lever that supports the wheel by another part, and a further part of the lever. And a cushioning material interposed between the pitcher main body and any part of the chassis.
[0076]
  For this reason, the shock absorber has the desired characteristics such that the magnitude of the impact force applied to the shock absorber through the pitcher body and the lever of the shock absorber can be increased or decreased depending on the lever ratio of the lever. With this shock absorber, a desired relaxation state can be obtained with respect to the impact force.
[0077]
  Therefore, the improvement of the lifetime of the pitcher main body can be achieved more reliably. In addition, since the above shock absorbers can be applied to various pitchers to achieve desired characteristics, it is not necessary to provide shock absorbers having different characteristics for each pitcher as in the past. Therefore, it is possible to easily manage parts for the shock absorbers of the pitchers.
[0078]
  Further, in the front-rear direction of the pitcher, the ground contact point of the wheel is positioned outward of the chassis, and the position of the part of the lever can be changed to an arbitrary position in the longitudinal direction.
[0079]
  For this reason, the pitcher is supported in a more stable state with respect to the ground as compared with the case where the ground contact point of the wheel is simply positioned at the same position as the chassis in the front-rear direction.
[0080]
  Therefore, the swing of the pitcher main body due to the reaction force when the pitcher main body throws the ball is suppressed to a small extent, and damage due to this swing is prevented. Improvement is more reliably achieved.
[0081]
  AlsoThe lever ratio between the linear distance from the part of the lever to the other part and the linear distance from the part of the lever to the further part is variable.
[0082]
  Therefore, according to the shock absorber, it is easy to change the lever ratio in order to obtain a desired relaxation state with respect to the impact force to the pitcher body, and the lever ratio is variable. As a result, the impact force can be more effectively mitigated, and thus the life of the pitcher body can be improved more reliably.
[Brief description of the drawings]
[Figure 1]FigureFIG.
[Figure 2]ThrowIt is a whole side view of a ball machine.
[Fig. 3]ThrowIt is a whole front view of a ball machine.
[Fig. 4]ThrowIt is a plane fragmentary sectional view of a ball machine.
[Figure 5]FigureFIG.
[Fig. 6]Figure5 is a sectional view taken along line 6-6 in FIG.
[Fig. 7]Figure4 is a partial enlarged detail view of FIG..
[Explanation of symbols]
  1 Thrower
  2 Ground
  3 carts
  4 balls
  5 Thrower body
  6 Ball supply member
  9 chassis
  10 wheels
  19 Fastener
  20 Support stand
  21 axis
  23 Rotating shaft
  24 Throwing Arm
  26 Throw arm body
  27 Ball receiver
  28 Spring
  29 Driving means
  32 Ball receiver body
  33 Stopper
  35 Bolt insertion hole
  36 nuts
  37 Bolt member
  39 Energizing arm
  48 Fastener
  49 Electric motor
  50 interlocking means
  52 box
  53 opening
  54 Lid
  55 Fastener
  58 Fastener
  63 Assembly
  65 spaces
  67 shock absorber
  68 lever
  69 pivot axis
  70 pivot axis
  71 axle
  72 cushioning material
  B Forward rotation
  C Reverse rotation
  D Throw
  E Placement distance
  L1 Straight line distance
  L2 Straight line distance

Claims (1)

A bogie that is movable on the ground, and a pitcher body that is supported by the bogie and that is capable of sequentially throwing balls supplied one by one from the outside toward the front, wherein the bogie has the pitcher body In a baseball practice throwing machine comprising a chassis that supports and supports the chassis, and wheels that are supported by the chassis and support the chassis on the ground,
A shock absorber is interposed between the chassis of the carriage and the wheel,
The shock absorber extends in the front-rear direction of the pitcher , and a part in the longitudinal direction is pivotally supported by the pitcher body or the chassis so that the shock absorber can rotate about a pivot axis extending in a substantially horizontal direction. A lever for supporting the wheel; and a cushioning material interposed between another part of the lever and any part of the pitcher main body and the chassis ,
In the front-rear direction of the pitcher, the ground contact point of the wheel is positioned outside the chassis, and the part of the lever can be converted to an arbitrary position in the longitudinal direction.
A linear distance leading to the other part from the portion of the upper Symbol lever, the impact force absorbing device in the linear range of the lever ratio of the variable has baseball practice ball throwing machine leading to the yet another portion of the portion of the lever.

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