201223712 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an open type ratchet wrench. [Prior Art] Bolting and fixing the workpiece (such as six __, hexagonal screw)
=== Type: The ratchet wrench is generally tied to the top of the HU workpiece or the bottom end (depending on the direction of the solid U) board ^. 'And the open-end wrench is the opening of the head seat from the fixed side of the side of the board to insert the ship knows 'the ratchet wrench is not easy to be inserted by the side of the insert = narrow 1 is particularly easy to use, and open σ wrench It is particularly easy to use in larger spaces because it can be inserted by the side of the fixed workpiece. 4· μ How can I provide an opening that can cope with any space? 3^:]' It is necessary to be the motivation of this invention. An open type ratchet wrench according to the present invention includes a wrench opening. a wrench head holder for receiving a solid, workpiece; the wrench head holder includes a first jaw and a movable jaw mounted on the second jaw; the first jaw is provided with a first acceptable workpiece - Pushing surface; the second cool claw is provided with an arc-side table facing the opening; the movable piece has a second push 2 and a second push surface which can receive the fixed J1 piece on the inner side, and the outer side is provided with The second jaw is provided with an arcuate outer surface of the curved inner side surface σ, and the movable lamella is mounted on the second plucking keel with its curved outer surface sliding along the hidden inner side surface of the second jaw . a partially closed wrench head seat having two inlets between the first jaw and the movable flap for receiving the workpiece; the curved inner side surface of the second jaw having the same curvature as the curved outer surface of the movable jaw The second claw also includes a support keel extending from the curved inner side table 201223712 toward the opening; the movable flap includes a proximal end and an end, and the movable flap further includes a proximal end separated by an open space compartment and the end a supporting lamella member; a supporting keel of the second jaw is disposed in an open space of the lamella member of the movable ram; the supporting keel includes an arcuate guiding groove, and the wrench head seat further includes a yoke fixed to the yoke a latch on the member for mounting the movable flap on the second jaw through the perforation; the length of the curved guide groove is sufficient for the latch to move with the curved guide groove; the direction of the curved guide groove is appropriately set to move the latch When the movable flap slides along the curved inner side surface of the second jaw with the curved outer surface, the curved outer surface and the curved inner surface are not in contact with each other; when the latch moves in the curved guide groove, Not with the supporting dragon The bones are in contact with each other; the proximal jaw member of the movable jaw includes a perforation and the wrench head includes a latch that should be attached to the support keel to pass the pin through the perforation in the trigger member; The proximal end flap member is provided with a larger size than the plug; the wrench head base further includes a spring disposed on the first pushing surface and the second pushing surface, so that the first jaw and the movable wrench can be set to six The angled end shape wrench; the first pushing surface and the second pushing surface of the other wrench head seat are respectively provided with notches, so that the first clamping jaw and the movable wrench can set the twelve-point angle end shape wrench; The pawl is stationary relative to the second jaw. According to the opening ratchet wrench forming method of the present invention, the method includes a wrench head seat including a first jaw and a second jaw which are partially open, and the second jaw The utility model comprises an arcuate inner side surface facing the opening; and a movable flap is mounted on the second jaw, and the movable flap is movable along the second jaw; the movable flap is mounted to include the movable flap in an arc shape The surface is attached to the curved inner side surface of the second jaw, and the movable flap can slide along the curved inner side surface of the second jaw with the curved outer surface; the installation movable flap can further include an j wrench attached to the movable flap a spring on the headstock; mounting the movable flap may further include securing a latch to the movable flap so that the latch passes through the arcuate guide groove in the second jaw, and the latch moves within the curved guide groove . In another aspect, an open type ratchet wrench device is provided. A movable plate is mounted on the first jaw and the second jaw, so that an opening for fixing the workpiece is formed between the first jaw and the movable plate. The movable flap can be slid on the curved inner side surface of the second jaw in the locked position by the arc ί 5 201223712; the curved outer surface of the movable flap is on the curved inner side surface of the second jaw Sliding and pushing the movable wrench away from the locked state, and widening the opening to fit the workpiece; after the workpiece is fixed, the curved outer surface of the movable sliding piece slides along the inner side surface of the second jaw Return the movable flap to the locked state to grasp the fixed workpiece.
Still another aspect describes an opening device formed by placing a fixed workpiece into a movable jaw mounted by an open jaw ratchet and a second jaw; the fixed workpiece at least surfaces engaging the pushing surface of the first jaw And a surface engaging the movable surface of the movable flap; the movable flap has an arcuate outer surface that fits the curved inner side surface of the second jaw; the device further includes a driving direction of the sleeve to fix the workpiece, and the workpiece is fixed The movable plate is stationary on both the first jaw and the second jaw. The device also includes an action of transferring the fixed workpiece in the direction of the ratchet operation; the fixed workpiece is in a stationary state in the first position and the movable plate. Also - the description of the side includes the H static type, - the movable piece mounted on the = static jaw, and one of the movable pieces fixed on the second stationary claw to transmit the power from the movable piece to the movable piece The second stationary jaw does not open the ratchet wrench of the bolt; the first stationary jaw and the surface of the movable flap 1 are both ring-opened to open σ to accept the fixed workpiece in the σ-type ratchet wrench. The following is a schematic diagram of the preferred embodiment, and the present invention is as follows: Referring to the first figure, the open type ratchet wrench 1 includes a head holder 2 having a correction σ 3 opening, and the head holder 2 can be sleeved. Mosquito workpiece 5 agricultural seat H opening 3 is located at the front end of the vertical axis y of the longitudinal axis of the handle 6, which is sometimes referred to as the side sleeve pulling, the so-called g hand 1 hexagonal screw head or - only hexagonal nuts. The garment has 15 sets of 5 sides 'even if the headstock 2 has a face 1 3 such as I, only one or more push faces contact the fixed workpiece 5 一 ί x a y-axis horizontally pulls the handle 6 Apply proper force or torque through the side of the workpiece; 201223712 The fixed workpiece 5 can be turned around the center point]L 9 (or cw center point) as a handle to be pulled backwards (pre-loading counterclockwise r direction to zero) and forward (forced clockwise D) The direction drive), in this order, is moved in the same order, and the workpiece 5 is fixed to achieve the fastening purpose. _Please refer to the first figure, the second figure and the third circle A-c, wherein the open type ratchet wrench 1 is configured as follows: the head base 2 includes a pair of static first type first jaws 4 connected to the handle 6. a second jaw 8, in this molding method, the stationary first jaw 4 is integrally formed with the stationary second jaw 8 and the handle 6, and the first jaw 3-facing the first push surface 1 of the opening 3 3. The second jaw (4) supports the movable plate χ 4 having the second pushing surface 15 and the third pushing surface 17; the first f moving surface 13, the second pushing surface 15 and the third pushing surface! 7 can be flat (as shown in Figure:) or notched 4 〇, 4 2 (as shown in the second and third A-C). Q Ϊ Look at the first picture, the _ fixed workpiece 5 has been completely placed on the wrench 1 open = virtual U -, the second and third push surfaces 13, 15, 17 can be opened in the second, third push Between the faces 15 and 17, a corner end 3 is formed. 1. At this time, the wrench 1 can set the hexagonal fixed workpiece 5 to a position of six degrees as a rotating position, which will fix the jade piece 5 and each pushing surface 1 Lu #17 sets the way... It is called the hexagonal end mounting form, and the size defined by the pushing surface 13 3, 15 is connected to the fixed workpiece Z. , the second...the second pushing surface 13,15 is further stepped into a 3-portion, 42' is divided into 13a, 15b upper cutting surface and 13 Ji cutting surface; the handle 6 is turned in the driving direction _, the torque That is, when the 5::^Aifa, 15b and the third pushing surface 17 are conveyed to the fixed workpiece '(2)', the fixed workpiece 5 remains stationary, and the sheet 1 is moved by the lower cutting surface 13b, 15a. Concave two, and third circle eight-C, wherein the first push surface 13 is set to 0 to cut into two partial cutting faces i 3 a, 丄 3 b and second 201223712 push surface 15 is also provided with a notch 4 2 is divided into two partial cutting faces i 5 a, 15 b, that is, the first jaw 4 and the movable plate 丄 4 can be divided by the notches 40 and 42 when the workpiece 5 is fixed in the standard position hexagon. The cutting face 3 = red 13 b, 15 a, 15 b is formed with a thirty degree rotation value; the first pushing surface 13 is a cutting face 13 a, 13 b including a notch 40 division, and the π notch 40 is The upper and lower oblique cutting faces 4 〇 a: i, that is, the upper and lower oblique cutting faces 4 〇 a, 4 〇 b of the notch 4 能 can be engaged with the cutting faces 1 3 a, 13 b Forming a one hundred and two positions with fixed workpieces 5 Surface; the other or may use other angles. The second pushing surface 15 is divided into two parts by upper and lower cutting surfaces 丄5 a, ^ ^, and the notch 4 2 includes upper and lower slopes which meet the corner end 31. The cutting faces 42 a, ' 2b, that is, the upper and lower inclined faces 42a, 42b of the notches 42 can be engaged with the upper and lower a, 15 third pushing faces 17 to form a fixed work = hand! The workpiece 5, and the handles 13 a, 15 b and the second pushing surface 15 apply a torsion force to the fixed workpiece 5; when the wrench i is placed in a standard position and the handle 6 is turned into the ratchet rotation direction R, the workpiece is fixed ==, 15 3 The pressure is applied to be able to disengage from the second pushing surface 15 of the third movable flap 14; and the third pushing surface 17 is placed on the inner surface of the overhanging member 2 facing the opening 3. The wrench 1 is placed to fix the workpiece 5 at a rotational position of one hundred and thirty degrees, and the torque is transmitted through the lower oblique cut surface 4 when entering the D direction. a, the upper oblique cutting surface 4 iif if piece 5; the wrench 1 is placed in a thirty-degree rotation position fixed to the second pair of lower oblique cutting surface 4 2 (four) plus pressure, can take off & - live, 14 second push surface jit Wherein the movable flap 14 is π-moved on the keel 16 of the second jaw 8, and the curved outer surface of the movable flap 14! β _ 2 _ outer _ 2 3 upper touch shaft === 201223712 New Zealand face i8 The outer member 23 of the partial η m two jaws 8 can be thicker than the first jaw 4, and the keel 16 is curved in the second jaw 8 The inner side surface 27 and the first cool claw are as by the overhanging member 29. The thickness t of the keel 16 is approximately one third of the virtual tear, and the base is at the center point t of the width w. 7 is divided into two parts by the keel 16 6 , and the width of each part is about one third of the thickness w of the outer member 2 3 . · In some applications, the claw is larger and larger than the first - jaw 4 The second jaw 8 can also be more protruded from the handle 6 than the first jaw 4. • The movable flap 14 is assembled in such a manner that it can be placed on the second jaw 8 'the movable flap 14 can be curved or kidney shaped and elongated; the movable flap 14 is wrapped with a solid end 3 3 and a slot The grooved proximal end 3 5 (shown in Figures B and C), and its thickness q is substantially the same as the thickness w of the second jaw 8; the grooved proximal end 3 5 is separated by an open space 45 Two plate members 3 5 a, 3 5 b. After being assembled on the second jaw 8, the blade members 3 5 a, 3 5 b on the movable plate 4 are positioned on both sides of the keel 16 and the keel 16 is in its open space 45; the movable plate The curved outer surface 18 of the 14 and the curved inner surface 27 of the second cooling jaw 8 have the same curvature and are collectively centered on the center point 3 9 of the movable flap 14 (CMP 3 9 ); CMP 3 9) is the center point of the fixed workpiece 5 (CW1 9) (shown in the first figure); when the movable plate 14 moves, the curved outer surface 18 is along the curved inner surface 2 7 can still maintain the fitting state; the second lost claw 8 can prevent the movable wrench 14 from being removed from the first jaw 4 during the setting and operation of the fixed workpiece 5 through the keel i 6; c WP39 is deviated from the action by the CW19 'The movable plate 14 moves downward toward the handle 6; and moves away from the CW 19 during the rotation of the ratchet. In addition to engaging with the first pushing surface 15 , the movable panel 14 further includes an overhanging member 28 8 ′ adjacent to the solid end 3 3 so that the second pushing surface 15 is engaged with the third pushing surface 17; The face 17 is extended at an angle of 120 degrees with the y-axis toward the opening 3; the length of the overhanging member 28 cannot be excessively extended into the opening 3; the activities of the movable plate 14 and the overhanging member 28 can be The wrench 1 is fixed by the side sleeve t 201223712; the angle between the extension member 28 and the third pushing surface 17 allows the wrench 1 to completely conform to the fixed workpiece 5. The movable plate 14 is fixed on the movable plate 14 by the plate members 3 5 a, 3 5 b on the sides of the keel 16 and then the pins 10 are inserted through the holes 10 7 a, 3 7 b. The χ 0 arc-shaped guide groove 12 in the keel i 6 has an upper curved surface 12 a, a lower curved surface 12 b, upper and lower arcs, 1 2 a, 1 2 b, both co-located in CMP 1 9 center point and activity, the arcuate outer surface 8 of the piece 14 and the curved inner side surface 2 of the second jaw 8 are centered, the curved guide groove! 2 more domain! The crucible is large so that it can be moved from the proximal end 12c to the end 12d in the upper and lower curved faces 12a, 12b without touching any surface of the 2; the movable lever η 4 can be manipulated to surround the CMP 3 as the latch 10 moves. 9 moves. The pushing faces of the first jaw 4 and the movable plate 14 are spaced apart from each other by an appropriate distance to determine that the central opening 3 can be sleeved to fix the workpiece 5; the first claw 4 fixes the opening 3 of the workpiece 5 when the ratchet rotates, It remains unchanged, that is, when the ratchet rotates, the wrench does not need to self-fix the workpiece 5 to rotate the CW 19 of the fixed workpiece 5. Referring to the spring 24 in the fourth figure, the coil spring 24 is located on the wrench head 2 at the end of the handle 6; the distal end 41 of the ridge 2 is grasped in the bore 26 of the wrench head 2' And fixed by the plug 3 2; the other end of the spring 2 4 is engaged with the pin 10, and the movable plate i 4 is pushed by the F force on the pin i 伸 the opening 2 extends into the curved guide groove 1 2 and is exposed to The pin member 3 5 = 3 5 b (shown in Figure 2C) is connected by a latch in the open space 45. The flap members 3 5 a, 3 5 b can be sized to cover the fox-shaped guide grooves 12 to prevent the springs 24 and pins i from disengaging. When the movable wrench 14 is subjected to an external force (the original force of the wrench 1 is not applied), F pushes the pin 10 to the end of the curved guide groove 1 2 i 2 d to stop locking without fitting with the fixed workpiece 5; fixing the workpiece 5 Positioned in the first jaw 4P and the movable plate 14 4, the pin 1 is pushed away from the end 12d of the curved guide 2; part of the size of the curved guide groove i2 and the spring 24 Γ ^ 9 201223712 , such as the elastic tension coefficient, have been selected during the operation of the fixed workpiece 5, and the plug 10 does not actually contact the ends of the curved guide groove i 2 with the faces i 2 a, 2 b 12 c, 12 d '· The actual torque generated by moving or rotating the fixed workpiece 5 is not sent to the first jaw 4 and the second jaw 8 through the bolt 1 . The bolt 0 is used to fix the movable wrench i 4 and prevent it from being wrenched. The headstock 2 is dropped; virtually all of the force and torque are transmitted through the curved outer surface 18 of the movable jaw 4 and the curved inner surface 27 of the second jaw 8. The wrench 1 can be sleeved by the side of the fixed workpiece 5, and the end of the workpiece $ is initially fixed - a width s larger than 2 σ 3 (p); the force piece 14 can be biased against the spring force F Pushing the fixed workpiece 5 forward toward the opening 3; for example, the movable plate 14 and the pin 1 〇 can be pushed down the CMP 3 9 to sleeve the fixed workpiece 5 into the opening 3 space; the spring 2 4 provides tension against the plug That is, the movable plate 14 is returned to the locked state to grasp the fixed workpiece 5 that has been installed. Please refer to the fifth and sixth figures, which show the condition of the wrench i drive and the ratchet rotation; the user can continue to pull the handle 6 in the driving direction 〇 (clockwise, the fifth figure) And driving the fixed workpiece 5 in a ratchet rotation direction R (counterclockwise, as shown in the sixth figure) without withdrawing the wrench 丄 from the fixed workpiece 5; when the driving direction d is pulled, the fixed workpiece 5 is in a stationary state. The movable flap 14 slides toward the wrench handle 6. Please refer to the fifth figure, wherein the fixed workpiece 5 is located in the opening 3 of the wrench 1; when the user pulls the wrench 2 in the driving direction D (clockwise direction), the stationary first jaw 4 and the first jaw 8 accept the user. The operated torque is rotated in the driving direction, and the second jaw 8 is rotated in the driving direction by the torque operated by the user; the first jaw 4 directly passes the torque through the upper cutting surface i 3 a and the fixed workpiece 5 The side is transmitted to the upper surface of the fixed workpiece 5, and the workpiece is pulled in the driving direction D; the second jaw 8 opposite the first jaw 4 transmits the pulling torque of the curved inner surface 27 to the curved shape of the movable plate 14 The outer surface 18; the upper cutting surface 1 5 b of the movable yoke J 4 and the third pushing surface χ 7 transmit the torque to the fixed workpiece 5 扳 to rotate the fixed workpiece 5 in the driving direction d; that is, the wrench is sufficient The movable plate [201223712 piece 14 moves in the opposite direction of the driving direction D; this urging action can avoid the fit of the curved outer surface 18 and the curved inner side surface 27 of the second jaw 8; the movable plate 14 Still in a locked state and the first jaw 4 and the second jaw 8 are in a stationary state; The torsion of the first jaw 4 and the movable jaw 14 pulls the workpiece in the driving direction D. Referring to the third and fifth figures, the workpiece 5 is fixed in a thirty-degree rotation state in the wrench 1 of the twelve-point end-end type, and the torque is transmitted through the first pushing surface of the first jaw 4. The lower beveled face 4〇a of the notch 40 and the upper beveled face 4 2 a of the notch 4 2 of the second pusher surface 15 of the movable plate 14 are transferred to the fixed workpiece 5. Please refer to the sixth circle, wherein the wrench 1 is rotated in the ratchet rotation direction R (counterclockwise direction); the side surfaces of the fixed workpiece 5 are urged on the lower cutting surface 15a of the movable plate 14; this force can be active The plate 丄 4 is pushed toward the spring 24 (as shown in the fourth figure); the pin 1 滑动 slides downward toward the proximal end i 2c of the curved guide groove 1 2 , and the movable plate 14 follows the arc of the second jaw 8 The inner side surface 27 slides; the width of the opening 3 between the stationary first-missing claw 4 and the movable flap 14 is increased, so that the wrench 1 can fix the workpiece 5 for ratcheting. The twelve-point angle end wrench and the fixed workpiece 5 are in a thirty-degree rotational position. When the wrench 1 is in the ratchet rotation position, the side surfaces of the fixed workpiece 5 are transmitted through the recess 4 2 of the second push surface 15 of the movable plate 14 The beveled face 4 2 b applies a force to the movable plate 14 . The handle 6 is firstly rotated in the ratchet rotation direction R, and the bolt i is transmitted through the curved guide groove 12 along the curved inner side surface 27 of the second jaw 8 toward the proximal end 12 c and the movable flap 14 The surface 18 is slid; the movable flap 14 is moved from the locked state (shown in FIG. 5) to the unlocked state; therefore, when the handle 6 is rotated in the ratcheting direction R, the movable flap 14 is along the stationary first jaw. 4. The second 2 jaws 8 are arcuately slid; the arcuate sliding of the movable jaws 14 is subject to movement by the latch and its curved outer surface 18 on the curved inner side surface 27 of the second jaw 8. The position of the CMP 3 9 and the curved guide groove i 2 and the curved outer surface 18 201223712 and the curved inner surface 27 are selected to move the movable plate i 4 downward and outward; the wrench 1 can be When the ratchet rotates, the angle ##^void member 5 hexagonal corner end hits the first, the first push surface i 3, i 5 ; the movable pull surface pushes the surface 1 5, i 7 and the first - the first jaw 4 The surface of each side of the two-solid workpiece 5 of the pushing surface i 3 is slid, so that the fixed workpiece 5 is in a stationary state. At the six-point end of the first riding, the _ wrench is placed, and the six-fifth of six degrees is about sixty degrees, and the first jaw-shaped jaw 4 and the movable yoke i 4 are wound around the hexagonal-Shaw end 4 9; Since the corner ends of the workpiece 2 are passed through the straight second pushing surface 15 and then enter the adjacent corner end 3, the spring force applied by the spring 24 to the movable flap 14 causes the movable flap 丄4 to reply to the fifth. The position of the figure is not shown; other illustrated twelve-point angle end wrenches, the corners of the fixed workpiece 5 are moved into the adjacent corner end 31 and or the movable wrench 14 only needs to be rotated 30 degrees to drive D and ratchet rotation. The direction R can be changed by rotating the handle 6 by two hundred and eighty degrees on the y-axis, so in the top view, the first jaw 4 is positioned on the right side of the fixed workpiece 5; in this manner, the driving direction D is counterclockwise The direction and the ratchet rotation direction R are clockwise. The components in the wrench 1 can be integrally manufactured and assembled; the materials suitable for the wrench i assembly include tool steel, hardened steel or other materials; the stationary type in the various components: the jaw 4, the second jaw 8 and the movable wrench 14 can be made of the same or different materials; the wrench 1 can be enlarged or reduced according to the standard and metric open-end wrench specifications: in some applications, the first static jaw 4 and the second jaw 8 can accept activities of different sizes. The flaps 14 are adapted to accommodate differently sized openings 3; the appropriately sized movable flaps 14 can be selected and assembled with wrench jaws to accommodate a particular size and shape of the stationary workpiece 5 without the need for separate wrenches. Other embodiments may be included in the scope of the following patent applications: ^ long wrenches such as 'wrench can have more or fewer components; movable flaps and static lost claws can be other shapes; curved guide grooves and latches It can be installed in reverse, with the pin set on the keel and the curved guide groove set at the proximal end of the movable plate. 12 201223712 For example, the wrench handle does not need to be in line with or in the same plane as the jaws; Μ + : The handle can be offset from the jaws or the plane of the jaws by a sharp angle to the plane of the jaws; the wrench handles and jaws can be The different parts are formed and interlocked by σ. The adjusting pin can splicing the handle to the upper or lower surface of the wrench head; the wrench handle can be curved or other shapes. For example, the wrench can be attached with a shortened handle that is inserted into a square hole to accommodate a torque wrench, such as a squat design. Such as 'what is the wrench handle two ends attached _ wrench head seat; each plate hand seat β, the first and second jaws and the movable plate mounted on the second jaw; the second claw and the movable wrench include Setting various surfaces for receiving the fixed workpiece; the wrench head at one end of the wrench may include a different size or shape opening, the opening C being included in the end of the wrench at the other end of the wrench handle, or two different openings of different sizes or shapes The opening. For example, unlike a coil spring, a flat spring or other type of spring can engage the latch and control the movement of the movable jaw; the spring can be otherwise attached to the wrench handle or the plate head. [S] 13 201223712
f Round type simple description j Second circle, which is the top view of the open type ratchet wrench for fixing the workpiece according to the present invention, and is an assembled appearance view of the open type ratchet wrench of the present invention. Circle A is an external view of the wrench head of the open type ratchet wrench of the present invention. Figure B is an external view of the movable wrench of the open type ratchet wrench of the present invention. , two round C, is the rear view of the movable wrench of the open type ratchet wrench of the present invention. The fourth circle is a relationship diagram between the assembled spring and the movable wrench of the open type ratchet wrench of the present invention. Fig. 5 is a schematic view showing the operation of the fixed workpiece by the open type ratchet wrench of the present invention. The sixth circle is a schematic diagram of the operation of the ratchet wheel of the open type ratchet wrench of the present invention. [Main component symbol description] 51 270 degrees socket range 8 second jaw 1 wrench 1 2 a upper curved surface 1 2 d end 1 3 b lower cutting surface 1 5 a lower cutting surface 1 7 third pushing surface 2 head seat 2 6 drilling 2 9 overhanging member 3 2 plug 3 5 a plate member 3 7 b perforation 4 0 notch 4 2 a Upper oblique cut surface 41 spring distal end 5 fixed workpiece 6 handle 1 0 latch 12 b lower curved surface 13 first push surface 14 movable flap 15 b upper cutting surface 18 curved outer surface 2 3 outer member 2 7 curved inner side Surface 3 opening 3 3 solid end 3 5 b plate member 3 9 CMP center point 4 2 notch 4 0 b upper oblique cutting surface 4 5 open space 12 curved guiding groove 1 2 c proximal end 13 a upper cutting surface 15 Two push surface 1 6 keel 19 CW center point 2 4 ridge 2 8 overhang member 3 1 corner end 35 grooved proximal end 3 7 a perforation 4 first lost claw 4 〇a lower oblique cut surface 4 2 b down oblique Cut surface 4 9 end