CN213196653U

CN213196653U - Machine tool clamp

Info

Publication number: CN213196653U
Application number: CN202021048629.0U
Authority: CN
Inventors: 李永泉
Original assignee: Anhui Tatfook Technology Co Ltd
Current assignee: Anhui Tatfook Technology Co Ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-05-14
Anticipated expiration: 2030-06-08

Abstract

The utility model discloses a machine tool fixture, be equipped with the main part that two at least supplies anchor clamps to fix a position the anchor clamps installation position of installation above that respectively including the outside, and the main part receives to drive ground to rotate the processing main shaft that makes the anchor clamps on the different anchor clamps installation position aim at the lathe, be connected with on the main part to be used for connecting with the revolving stage and follow the rotatory rotating base of revolving stage. The machine tool clamp can simultaneously clamp a plurality of clamps and common parts, and compared with the mode that the machine tool clamp in the prior art can only clamp one workpiece, the clamping times are reduced, so that the influence of machine tool working efficiency caused by the machine tool clamping during shutdown is reduced; and the main body part can adjust the external clamp and the processing direction of the male part relative to the machine tool main shaft when driven to rotate, so that the machine tool main shaft can process three surfaces of a workpiece, the clamping frequency of the workpiece is further reduced, the working efficiency of the machine tool is improved, and the influence of multiple clamping of the workpiece on the processing precision of the workpiece is reduced.

Description

Machine tool clamp

Technical Field

The utility model relates to a machine tool machining equipment technical field, concretely relates to machine tool fixture.

Background

According to different clamping directions of the clamp, the traditional milling machine is divided into a horizontal milling machine and a vertical milling machine, a processing main shaft of the horizontal milling machine is parallel to a workbench, and a processing main shaft of the vertical milling machine is perpendicular to the workbench. The existing milling machine generally only has one processing main shaft, and only one cutter can be operated at one time to process the characteristics of one surface.

Because the existing machine tool clamp can only clamp one workpiece at a time, and only one surface of the workpiece can be machined during clamping at each time, when a plurality of surfaces of the workpiece need to be machined, the machining of each workpiece needs a worker to clamp the workpiece for a plurality of times, and the problems that the clamping times of the workpiece are large and the working efficiency of a machine tool is influenced exist.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming current lathe anchor clamps and once only can clamping work piece and have the defect that work piece clamping number of times is many, lathe work efficiency is low to a lathe anchor clamps is provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a machine tool fixture, comprising:

the main body component is externally provided with at least two clamp mounting positions on which the clamps are respectively positioned and mounted, and the clamps on different clamp mounting positions are driven to rotate to align with a processing main shaft of the machine tool.

Further, a rotating base which is connected with the rotary table and rotates along with the rotary table is connected to the main body component.

Furthermore, the main body part is a square body, the rotating base is located at the bottom of the main body part, and the at least two fixture mounting positions are respectively located on different outer side faces of the main body part.

Furthermore, the main body part comprises four outer side plates which are enclosed to form a middle square cavity, at least two groups of valve push rod assemblies are arranged in the middle square cavity, and the telescopic end of each group of valve push rod assembly extends out of the outer side plates and is exposed outside the main body part.

Furthermore, each group of valve push rod assemblies comprises a plurality of valve push rods, and valve push rod caps of the valve push rods in the same group extend out of the first mounting through holes in the outer side plate respectively.

Further, the fixture mounting position comprises a plurality of fixture positioning pins arranged on the outer side plate, and the fixture is mounted on the outer side plate through matching positioning of a plurality of positioning holes on the fixture mounting position and the plurality of fixture positioning pins.

Further, the clamp comprises a mounting bottom plate provided with a plurality of positioning holes, and the mounting bottom plate is positioned and mounted on the outer side plate through the plurality of positioning holes; and the mounting bottom plate is provided with a plurality of second mounting through holes for the extension ends of the valve push rod assemblies to extend out.

Furthermore, a workpiece positioning pin for positioning and mounting a workpiece on the mounting bottom plate is arranged on the side surface of the mounting bottom plate opposite to the outer side plate, and the clamp further comprises a limiting part which is arranged on the mounting bottom plate and used for limiting and pressing the workpiece.

Furthermore, the limiting part comprises at least two first power parts connected to the mounting base plate through a fixing seat, and a limiting stop block which can be driven by the first power parts to block one side surface of the workpiece, back to the outer side plate, so as to limit the workpiece.

Further, the stopper includes: the at least one pair of second power parts are oppositely arranged and installed on the installation bottom plate, and the telescopic direction of the telescopic ends of the second power parts is perpendicular to the outer side plate; and two ends of the limiting baffle are respectively connected with the telescopic ends of the pair of second power parts, and the limiting baffle can be driven by the second power parts to block one side surface of the workpiece, which is back to the outer side plate, so as to limit the workpiece.

Further, the mounting base plate is detachably mounted to the outer side plate of the main body part by a locking screw.

Further, each clamp mounting position can be used for positioning and mounting one or more clamps thereon.

Further, the clamp mounting location is located on one or adjacent outer sides of the body member.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a machine tool clamp, the outside of main part is equipped with a plurality of and supplies the anchor clamps to fix a position the anchor clamps installation position of installation on it, makes this machine tool clamp once can clamp a plurality of anchor clamps and a plurality of work pieces simultaneously, compares with the mode that machine tool clamp in the prior art can only clamp a work piece once, has reduced the clamping number of times to reduce because of shutting down the influence of clamping work piece to the lathe work efficiency; in addition, the main body part can rotate under the action of the driving force, and the clamp positioned outside the main body part can adjust the processing direction relative to the main shaft of the machine tool, so that the main shaft of the machine tool can process three surfaces of a workpiece on the clamp in sequence, the clamping times of the workpiece are further reduced, and the working efficiency of the machine tool is improved; and the influence of errors caused by repeated clamping of the workpiece on the machining precision of the workpiece is reduced, and the machining precision of the related sizes on all the surfaces of the workpiece is improved.

2. The utility model provides a machine tool fixture, main part pass through rotating base and install the mode of revolving stage on the lathe, make things convenient for the revolving stage to drive main part and rotate steadily.

3. The utility model provides a machine tool fixture, the main part simple structure that is the square body, its four lateral surfaces can all select to set up two at least anchor clamps installation positions, and two at least anchor clamps installation positions are located the different lateral surfaces of main part respectively, can reduce the mutual interference of a plurality of anchor clamps installation behind the anchor clamps installation position.

4. The utility model provides a machine tool fixture, the valve push rod subassembly that has independent air supply is communicated respectively to installation multiunit in the middle side intracavity of main part, can ensure that every group valve push rod subassembly adsorbs wherein the outside work piece of an outer panel steadily, ensures that the lathe main shaft is processed in order steadily to multiunit work piece on the main part.

5. The utility model provides a machine tool fixture, anchor clamps are through the mode of a plurality of locating hole location installations on the anchor clamps locating pin of main part on it, can ensure that anchor clamps install on the outer panel of main part with accurate clamping position, and then ensure the machining precision of installation work piece on the anchor clamps.

6. The utility model provides a machine tool fixture, when the anchor clamps facial make-up presss from both sides the work piece, earlier fix a position the mounted position of work piece through a plurality of work piece locating pins on the mounting plate, then hold the work piece through valve push rod subassembly, compress tightly the work piece on machine tool fixture through the locating part at last, can ensure the stable installation of work piece on machine tool fixture, ensure the machining precision of installation work piece on the anchor clamps.

7. The utility model provides a machine tool fixture, the locating part of anchor clamps on two different anchor clamps installation positions adopts different structures, can adapt to the fixed demand of centre gripping of the different sides of different shape work pieces or work pieces, makes a lathe just can process reduction in production cost to each side of work piece.

8. The utility model provides a machine tool fixture, the mounting plate of anchor clamps passes through locking screw demountable installation in the mode of outer panel, and the anchor clamps of different grade type are changed to the processing demand of convenient different work pieces more.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first surface of a machine tool fixture according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second surface of the machine tool fixture according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a body component according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a main body component according to an embodiment of the present invention, wherein a cover plate of the main body component is hidden to show an internal structure thereof;

FIG. 5 is a schematic view of the entire structure of the main body part of FIG. 4 with the valve push rod hidden;

FIG. 6 is a schematic view of a clamp mounted on the body member of the present invention;

fig. 7 is a schematic structural view of another clamp mounted on the body member of the present invention.

Description of reference numerals: 1. a main body member; 11. an outer panel; 111. a first mounting through hole; 112. a clamp positioning pin; 113. a screw mounting hole; 12. rotating the base; 13. a cover plate; 2. a clamp; 21. mounting a bottom plate; 211. positioning holes; 212. a second mounting through hole; 22. a workpiece positioning pin; 23. a limiting member; 231; a fixed seat; 232. a first power member; 233. a limit stop block; 234. a second power member; 235. a limit baffle; 3. a valve push rod; 31. valve push rod cap.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

A machine tool holder as shown in fig. 1-7 comprises a body member 1, and the body member 1 is externally provided with at least two holder mounting locations on which the holders 2 are respectively positioned and mounted. After the main body part 1 is mounted on the machine tool, the main body part 1 is driven to rotate so that the clamps 2 on different clamp mounting positions can be sequentially aligned with a processing spindle of the machine tool.

The machine tool fixture has the advantages that the fixture mounting positions for positioning and mounting the fixtures 2 on the main body part 1 are arranged outside the main body part, so that the machine tool fixture can simultaneously clamp a plurality of fixtures 2 and a plurality of workpieces at one time, and compared with the mode that the machine tool fixture in the prior art can only clamp one workpiece at one time, the clamping times are reduced, and the influence of machine tool working efficiency caused by the machine tool fixture in a halt mode is reduced; in addition, the main body part 1 can rotate under the action of the driving force, and the clamp 2 positioned outside the main body part 1 can adjust the processing direction relative to the main shaft of the machine tool, so that the main shaft of the machine tool can process three surfaces of a workpiece on the clamp 2 in sequence, the clamping times of the workpiece are further reduced, and the working efficiency of the machine tool is improved; and the influence of errors caused by repeated clamping of the workpiece on the machining precision of the workpiece is reduced, and the machining precision of the related dimensions on all the surfaces of the workpiece is improved.

In a specific embodiment of the present embodiment, the main body part 1 is a square body, and a rotating base 12 for connecting with a turntable on a machine tool and rotating along with the turntable is connected to the bottom of the main body part 1. The square main body part 1 has a simple structure, and clamp mounting positions can be selectively arranged on the four outer side surfaces of the square main body part; and the main body part 1 is arranged on a turntable of the machine tool through the rotating base 12, so that the turntable can drive the main body part 1 to stably rotate. In other embodiments, the main body member 1 may also be in various shapes such as a column shape, a spherical shape, a regular dodecahedron shape, etc., as long as at least two fixture mounting positions for positioning and mounting the fixture 2 are provided on a plurality of different outer side surfaces of the main body member 1; the main body part 1 can be mounted on the rotating base 12 to rotate around the longitudinal axis of the rotating base 12, and can also be set to rotate around multiple axes according to requirements, and only the clamps 2 on different clamp mounting positions on the main body part can be aligned with a processing spindle of a machine tool in sequence in the rotating process.

Furthermore, there are two clamp installation positions and are respectively located on two opposite outer side surfaces of the square body component 1. The arrangement mode of the clamp mounting positions can reduce the mutual interference of two clamps 2 and workpieces clamped by the two clamps after the two clamps are respectively mounted at the corresponding clamp mounting positions, and can also meet the processing requirements of some special-shaped workpieces (such as L-shaped workpieces). It can be understood here that there may also be four fixture mounting locations respectively located on four outer side surfaces of the body member 1 in a square shape; or two clamp mounting locations each occupying two adjacent sides of the body member 1. Also, the jig 2 to be mounted on the jig mounting place may be one or more.

In this embodiment, the main body member 1 includes four outer panels 11 enclosing a square cavity formed therein, wherein the two opposite outer panels 11 are respectively provided with a first mounting through hole 111. Anchor clamps 2 are including all installing the valve push rod subassembly at the inner wall of outer panel 11, and two sets of valve push rod subassemblies of two anchor clamps 2 all are located middle square intracavity and communicate respectively has independent air supply, and the top of four outer panels 11 is connected with the apron 13 that is used for the middle square chamber of closing cap. Each group of valve push rod assemblies comprises three valve push rods 3, and valve push rod caps 31 of the three valve push rods 3 in the same group respectively extend out of the first mounting through holes 111 of the same outer side plate 11 and are exposed outside the main body component 1 to form a suction plane for sucking workpieces. Two groups of valve push rod assemblies which are respectively communicated with independent air sources are arranged in the middle square cavity of the main body part 1, so that each group of valve push rod assemblies can be ensured to stably adsorb a workpiece outside one of the outer side plates 11, and a main shaft of the machine tool can be ensured to orderly and stably process a plurality of groups of workpieces on the main body part 1. And, the valve push rod subassembly is built-in the interior structure setting of main part 1, reduces the space occupation of valve push rod subassembly.

In the present embodiment, the jig mounting place includes a plurality of jig positioning pins 112 and screw mounting holes 113 provided on the outer side plate 11 of the main body member 1. The jig 2 is positioned on the outer side plate 11 by the engagement of the plurality of positioning holes 211 thereon with the plurality of jig positioning pins 112, and the fixing of the jig 2 on the outer side plate 11 is carried out by locking screws passed through the screw mounting holes 113. The manner in which the jig 2 is positioned and mounted on the jig positioning pins 112 of the body member 1 through the plurality of positioning holes 211 thereon can ensure that the jig 2 is mounted on the outer side plate 11 of the body member 1 in a precise clamping orientation, thereby ensuring the machining accuracy of the workpiece mounted on the jig 2. And the mounting plate 21 of anchor clamps 2 passes through the mode of locking screw demountable installation in outer panel 11, makes things convenient for the processing demand of different work pieces more, changes the anchor clamps 2 of different grade type.

In the present embodiment, the jig 2 includes a mounting base plate 21 which is positioned and mounted on the outer side plate 11 through a plurality of positioning holes 211, a workpiece positioning pin 22 which is mounted on the mounting base plate 21 and on which a workpiece is positioned and mounted, and a limiting member 23 which is mounted on the mounting base plate 21 and is used for limiting and pressing the workpiece, and a plurality of second mounting through holes 212 which correspond to the positions of the valve push rod caps 31 and through which the valve push rod caps 31 pass are provided on the mounting base plate 21. When a workpiece is clamped on the clamp 2, the mounting position of the workpiece is firstly positioned through the workpiece positioning pins 22 on the mounting bottom plate 21, then the workpiece is sucked through the air valve push rod assembly, and finally the workpiece is tightly pressed on the machine tool clamp through the limiting part 23, so that the stable mounting of the workpiece on the machine tool clamp can be ensured, and the processing precision of the workpiece mounted on the clamp 2 is ensured.

Specifically, the mounting base plate 21 is provided with a plurality of mounting holes for mounting the workpiece positioning pins 22, the workpiece positioning pins 22 adopt two positioning modes of dead pin positioning and floating pin positioning, the workpiece positioning pins 22 adopting dead pin positioning are fixedly mounted in one specific mounting hole, the workpiece positioning pins 22 adopting floating pin positioning are movably mounted in one of the mounting holes with the same size, and the mounting holes are selectively mounted according to the shape of the workpiece so as to adapt to the positioning requirements of different workpieces.

In the present embodiment, the structures of the clamps 2 at two adjacent clamp installation positions are different, and the specific difference is mainly reflected on the limiting member 23 of the clamp 2. In one jig 2 mounted on the body member 1, as shown in fig. 6, the stoppers 23 are six in number and fixed two by two on both sides of the mounting base 21. Specifically, the limiting member 23 includes a fixing seat 231 fixed on the mounting base plate 21, a first power member 232 mounted on the fixing seat 231, and a limiting stopper 233 capable of stopping on a side of the workpiece facing away from the outer side plate 11 to limit the workpiece under the driving of the first power member 232. Specifically, the first power member 232 is an air rod, the expansion direction of the air rod is perpendicular to the expansion direction of the air valve push rod assembly, after the workpiece is positioned and mounted on the mounting base plate 21 of the fixture 2, the plurality of air valve push rod caps 31 of the air valve push rod assembly suck the side face of the workpiece facing the mounting base plate 21, and then the first power member 232 drives the limit stop 233 to extend to the upper side face, back to the mounting base plate 21, of the workpiece, so that the mounting and the positioning of the workpiece on the fixture are realized.

In another jig 2 mounted on the body member 1, as shown in fig. 7, there are two pairs of the retaining members 23, and each pair of the retaining members 23 includes a pair of the second power members 234 and the retaining stoppers 235. The pair of second power members 234 are oppositely arranged and mounted on the mounting base plate 21, the second power members 234 are specifically cylinders, and the telescopic direction of the telescopic ends of the cylinders is perpendicular to the outer side plate 11 and is the same as that of the valve push rod assembly; two ends of the limiting baffle 235 are respectively connected to the telescopic ends of the pair of second power members 234, and the limiting baffle can block one side surface of the workpiece, which is back to the outer side plate 11, under the driving of the second power members 234 so as to limit the workpiece. After the workpiece is positioned and mounted on the mounting base plate 21 of the fixture 2, the plurality of valve push rod caps 31 of the valve push rod assembly hold the side of the workpiece facing the mounting base plate 21, and then the pair of second power members 234 drive the limit baffles 235 to be close to the workpiece until the limit baffles are pressed on the surface of the workpiece, which is opposite to the outer side plate 11, so that the mounting and positioning of the workpiece on the fixture are realized.

The clamps 2 on two different clamp mounting positions adopt different structures, can adapt to the clamping and fixing requirements of different side surfaces of workpieces in different shapes or workpieces, so that one machine tool can process each side surface of the workpiece, and the production cost is reduced.

In this embodiment, in order to ensure the accuracy of the positioning of the clamp 2 on the four outer panels 11, in the manufacturing process of the main body member 1, the outer surfaces of the four outer panels 11 are machined by simultaneously leveling and deburring by lathing, and various mounting through holes or positioning holes on the outer panels 11 and the mounting base plate 21 are all machined and formed at one time. The reference surface of the mounting baseplate 21 is leveled by a one-time processing procedure.

In summary, the machine tool clamp provided by the embodiment of the invention has the advantages that the plurality of clamp mounting positions for positioning and mounting the clamps 2 on the main body part 1 are arranged outside the main body part, so that the machine tool clamp can simultaneously clamp a plurality of clamps 2 and a plurality of workpieces at one time, and compared with the mode that the machine tool clamp in the prior art can only clamp one workpiece at one time, the clamping times are reduced, and the influence of machine tool working efficiency caused by the machine tool clamping due to shutdown is reduced; in addition, the main body part 1 can rotate under the action of the driving force, and the clamp 2 positioned outside the main body part 1 can adjust the processing direction relative to the main shaft of the machine tool, so that the main shaft of the machine tool can process three surfaces of a workpiece on the clamp 2 in sequence, the clamping times of the workpiece are further reduced, and the working efficiency of the machine tool is improved; and the influence of errors caused by repeated clamping of the workpiece on the machining precision of the workpiece is reduced, and the machining precision of the related dimensions on all the surfaces of the workpiece is improved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A machine tool fixture, comprising:

the main body component (1) is externally provided with at least two clamp mounting positions on which the clamps (2) are respectively positioned and mounted, and the clamps (2) on different clamp mounting positions are driven to rotate to align with a processing main shaft of a machine tool.

2. Machine tool holder according to claim 1, characterized in that a rotary base (12) is attached to the body part (1) for connection to and rotation with a turntable.

3. The machine tool holder according to claim 2, wherein the body member (1) is a square body, the swivel base (12) is located at the bottom of the body member (1), and at least two of the holder mounting locations are located on different outer sides of the body member (1), respectively.

4. A machine tool holder according to any one of claims 1 to 3 wherein the body member (1) includes four outer side plates (11) enclosing a central square cavity in which at least two sets of valve lifter assemblies are mounted, the telescoping end of each set of valve lifter assemblies extending from the outer side plates and being exposed to the exterior of the body member (1).

5. The machine tool fixture according to claim 4, wherein each set of the valve push rod assemblies comprises a plurality of valve push rods (3), and valve push rod caps (31) of a plurality of valve push rods (3) of the same set respectively extend from a plurality of first mounting through holes (111) on the same outer side plate (11).

6. The machine tool clamp according to claim 4, wherein the clamp mounting location comprises a plurality of clamp locating pins (112) provided on the outer side plate (11), the clamp (2) being positionally mounted on the outer side plate (11) by cooperation of a plurality of locating holes (211) therein with the plurality of clamp locating pins (112).

7. The machine tool fixture according to claim 6, wherein the fixture (2) comprises a mounting base plate (21) having a plurality of positioning holes (211) formed therein, the mounting base plate (21) being positionally fixed to the outer side plate (11) through the plurality of positioning holes (211); and the mounting bottom plate (21) is provided with a plurality of second mounting through holes (212) for extending the telescopic end of the valve push rod assembly.

8. The machine tool fixture according to claim 7, wherein the side of the mounting base plate (21) opposite to the outer side plate (11) is provided with a workpiece positioning pin (22) for positioning and mounting a workpiece thereon, and the fixture (2) further comprises a limiting member (23) mounted on the mounting base plate (21) for limiting and pressing the workpiece.

9. The machine tool fixture according to claim 8, wherein the limiting member (23) comprises at least two first power members connected to the mounting base plate (21) through a fixing seat, and a limiting stopper capable of stopping on a side of the workpiece facing away from the outer side plate to limit the workpiece under the driving of the first power members.

10. The machine tool clamp according to claim 8, characterized in that the stop (23) comprises:

at least one pair of second power members which are oppositely arranged and are arranged on the mounting bottom plate (21), and the extension direction of the extension end of each second power member is vertical to the outer side plate (11);

and two ends of the baffle are respectively connected with the telescopic ends of the pair of second power parts, and the baffle can be driven by the second power parts to block one side surface of the workpiece, which is back to the outer side plate, so as to limit the workpiece.

11. The machine tool clamp according to claim 7, wherein the mounting base (21) is detachably mounted to the outer side plate (11) of the body part (1) by means of locking screws.

12. A machine tool fixture according to any one of claims 1-3, wherein each fixture mounting location is adapted for the positioning mounting of one or more fixtures (2) thereon.

13. A machine tool holder according to any one of claims 1-3 wherein the holder mounting location is located on one or adjacent outer sides of the body member (1).