Side grip hammer having auxiliary boom

Abstract

A side grip hammer having an auxiliary boom according to the present invention is coupled to a boom of heavy equipment machinery and provided with: a hammer body having a mounting portion on the upper side; a vibrating body installed to be able to vibrate by placing an elastic support unit on the hammer body; a side grip installed on the vibrating body and gripping a pile; a driving unit provided with a vibration generating unit that drives the vibrating body up and down; the auxiliary boom of which one end is coupled to the mounting portion of the hammer body by a main hinge portion so as to be rotatable in the front-rear direction, and the other end is coupled to the boom; and a hammer orientation maintaining unit that corrects and fixes the orientation of the hammer body suspended on the auxiliary boom by the main hinge portion, or maintains a no-load state with respect to the rotation of the hammer body.

Description

Side grip hammer with auxiliary boom

[0001] The present invention relates to a side grip hammer having an auxiliary boom installed on the boom of a construction machine or heavy equipment machine, and more specifically, to a side grip hammer having an auxiliary boom that can expand the working area of ​​the side grip hammer and improve the precision of pile construction by maintaining the position of the side grip hammer body or a rotational no-load state during pile driving or extraction operations.

[0002] Generally, to construct architectural or civil engineering structures, piles are driven into the ground to secure the bearing capacity of the foundation. Various materials, such as steel and concrete, are used for piles serving as the foundations of structures. To install these piles, pile drivers utilizing vibration or impact force are employed.

[0003] In particular, side grip hammers are primarily used when constructing steel piles, such as sheet piles and H-beams, for roads, revetments, ports, or river construction projects.

[0004] Korean Registered Patent No. 10-2265056 discloses a vibro hammer having side grips. The vibro hammer according to the prior art has a built-in gearbox that generates vibration, a side clamp part including a pair of arms and a pair of side grips, a mount part connected to the boom of a construction heavy equipment machine, a housing bracket connected to and coupled with the side clamp part, and a bottom clamp located at the bottom of the side clamp part to apply vibration to the top of a pile for drilling.

[0005] A conventional vibro hammer with a side grip configured as described above is mounted on the boom of an excavator and used; however, when a pile for construction is gripped by the hammer, the center of gravity of the hammer is biased toward the pile, making it difficult to control the hammer horizontally during the pile construction process. In other words, the side grip hammer is controlled using the boom of the excavator, a bucket cylinder installed on the boom, and an actuator installed on the hammer; however, when the center of gravity is eccentric due to the heavy pile, it is difficult to control the hammer horizontally by the bucket cylinder.

[0006] In addition, in a vibrohammer with a side grip supported at the end of the excavator boom, the working area is limited by the length of the excavator boom, so it is difficult to expect improved constructability for relatively long piles.

[0007] Korean Registered Patent No. 10-0962081 discloses a vibro hammer device having a side gripper, and Korean Published Patent No. 10-2020-0134776 discloses a side gripper.

[0008] Conventional side grip hammers as described above cannot fundamentally solve the problem of eccentricity of the center of gravity when combined with the boom of construction heavy machinery, and it is difficult to expect an expansion of the working range due to the height limitation of the boom.

[0009] In addition, conventional vibro hammers equipped with side grippers have the grippers fixedly installed on the sides of the hammer, making it difficult to grip the target pile and adjust the pile installation angle.

[0010] A patent filed by the inventor of the present invention for an automatic vertical adjustment device for a side grip pile driver is disclosed in Korean Published Patent No. 10-2024-0038935.

[0011] The present invention aims to solve the problems described above by providing a side grip hammer having an auxiliary boom that can expand the working area during pile driving or extraction operations and correct eccentric shift of the center of gravity when gripping a pile by the side grip, thereby fixing the position of the side grip hammer or maintaining the side grip hammer in a rotational no-load state during pile construction.

[0012] The side grip hammer having an auxiliary boom according to the present invention for achieving the above objective is coupled to the boom of a heavy machinery and is characterized by comprising: a hammer body having a mounting portion on the upper side; a vibrating body installed to vibrately via an elastic support unit interposed therein on the hammer body; a side grip installed on the vibrating body to grip a pile; a driving unit having a vibration generating portion that drives the vibrating body up and down; an auxiliary boom having one side rotatably coupled to the front and rear directions by means of the mounting portion and main hinge portion of the hammer body and the other side coupled to the boom; and a hammer posture maintaining portion that corrects and fixes the posture of the hammer body suspended on the auxiliary boom by means of the main hinge portion or maintains a no-load state for the rotation of the hammer body.

[0013] It is preferable that the above hammer posture maintaining part is equipped with an actuator configured to adjust the rotation angle of the hammer body in the front-rear direction relative to the auxiliary boom, centered on the above main hinge part.

[0014] The actuator of the hammer position maintaining unit may be composed of a hydraulic cylinder having a cylinder body hinged to the auxiliary boom and a cylinder rod that can be moved in and out of the cylinder body and is hinged to the mounting unit by a sub-hinge shaft.

[0015] The above hammer position maintaining member may be provided with a position fixing member installed adjacent to a support bracket of the mounting member and having at least one fixing hole formed therein, and an actuator installed on the support bracket to release the connection of a fixing pin coupled to the fixing hole of the position fixing member.

[0016] It is preferable that the above hammer posture maintaining unit comprises an angle detection sensor installed in the above mounting unit and a control unit that controls the operation of the actuator based on an angle value detected by the angle detection sensor.

[0017] According to another aspect of the present invention, a side grip hammer having an auxiliary boom of the present invention for achieving the above objective is coupled to the boom of a heavy machinery and comprises: a hammer body having a mounting portion on the upper side; a sub-body rotatably installed by means of a rotating shaft installed on both sides of the hammer body; a vibrating body vibratingly installed on the sub-body by means of an elastic support unit; a side grip installed on the vibrating body to grip a pile; a driving unit having a vibration generating portion that drives the vibrating body up and down; an auxiliary boom having one side rotatably coupled in the front-rear direction by means of the mounting portion and main hinge portion of the hammer body and the other side coupled to the boom; and a hammer posture maintaining portion that corrects and fixes the posture of the hammer body suspended on the auxiliary boom by means of the main hinge portion or maintains a no-load state for the rotation of the hammer body. It is characterized by having a sub-tilting unit installed on the hammer body, which rotates the sub-body and the drive unit around the rotation axis to adjust the side grip to be maintained at any angle within a rotation range from a vertical state to a horizontal state.

[0018] It is preferable that the above sub-tilting unit comprises a rotary link installed on the rotary axis and an actuator installed on the side of the hammer body to rotate the rotary link.

[0019] The side grip hammer with an auxiliary boom according to the present invention enables stable operation during pile construction work because the center of gravity of the side grip hammer changes due to the self-weight of the pile, making it easy to adjust and correct the tilted angle of the hammer body.

[0020] In addition, the side grip hammer with an auxiliary boom according to the present invention can increase the degree of freedom when suspending a pile using a side grip suspended on the auxiliary boom, so when mounted on the boom of heavy machinery, that is, the boom of an excavator, precise construction of the pile is possible and the working area can be relatively expanded.

[0021] FIG. 1 is a perspective view showing an embodiment of a side grip hammer with an auxiliary boom according to the present invention mounted on a construction machine (excavator).

[0022] Figure 2 is a perspective view of a side grip hammer with an auxiliary boom as shown in Figure 1.

[0023] Fig. 3 is a side view of a side grip hammer with an auxiliary boom as shown in Fig. 1.

[0024] FIG. 4 is a perspective view showing another embodiment of the hammer posture maintaining part of a side grip hammer with an auxiliary boom according to the present invention.

[0025] FIG. 5 is a perspective view illustrating another embodiment of a side grip hammer with an auxiliary boom according to the present invention.

[0026] FIG. 6 is a perspective view showing another embodiment of a side grip hammer with an auxiliary boom according to the present invention.

[0027] Figure 7 is a usage diagram showing the construction state of a side grip hammer with an auxiliary boom shown in Figure 1 installed on the boom of an excavator.

[0028] FIGS. 8 and FIGS. 9 are drawings illustrating the operating state of a side grip hammer with an auxiliary boom as shown in FIGS. 5.

[0029] Examples of a side grip hammer with an auxiliary boom according to the present invention are shown in FIGS. 1 to 6.

[0030] Referring to the drawing, the side grip hammer (10) with an auxiliary boom according to the present embodiment is used by being coupled to a boom (210) on which a bucket cylinder (211) of a construction machine or heavy equipment machine, such as an excavator (200), is installed.

[0031] This side grip hammer (10) comprises a hammer body (11) having a mounting part (20) on the upper side, a vibrating body (51) that is vibratingly installed on the hammer body (11) by an elastic support unit (15), a side grip (30) that is installed on the vibrating body (51) to grip a file (300) for work, and a driving unit (50) that has a vibration generating part that vibrates the side grip (30) up and down.

[0032] And an auxiliary boom (60) is installed that is connected to the mounting part (20) of the side grip hammer (10) through the main hinge part (40) and supports the hammer body (11) so that it can rotate in the forward and backward direction (direction of arrow “B” in FIG. 2).

[0033] In addition, the mounting part (20) of the side grip hammer (10) and the auxiliary boom (60) are provided with a hammer posture maintaining part (70) to fix the posture of the hammer body (11) suspended on the auxiliary boom (60) by the main hinge part (40) or to maintain the rotation of the hammer body (11) in a no-load state.

[0034] The side grip hammer with an auxiliary boom according to the present invention, configured as described above, will be explained in more detail by component as follows.

[0035] Although not described in detail in the drawing, the vibration generating part of the drive unit (50) elastically supported by the hammer body (11) may have a structure in which multiple pairs of drive shafts, each equipped with an eccentric weight, are installed parallelly inside the vibration body (51), and gears that mesh with each other are installed on each of these drive shafts. The eccentric weights installed on the drive shafts are installed in the same direction on the drive shafts to maximize vertical vibration. Additionally, an actuator, i.e., a hydraulic motor, is installed in the vibration body (51) to drive at least one or multiple of the two drive shafts.

[0036] This configuration is disclosed in Korean Registered Patent No. 10-0878296 and Korean Registered Patent No. 10-1178276, filed and registered by the inventor. However, the vibration generating unit is not limited to the embodiments described above, and any structure capable of vibrating the vibration body in the up-and-down direction may be adopted.

[0037] The elastic support member (15) is a component that supports the vibrating body (51) so that it can vibrately suspend the vibrating body (51) relative to the hammer body (11), and both ends of the elastic support member are fixed to the hammer body (11) and the vibrating body (51), respectively. The elastic support member (15) may be formed by alternately stacking rubber plates and metal plates. The elastic support member is not limited to the above embodiment and may be configured to include an elastic spring so that it can vibrately support the vibrating body (51) relative to the hammer body (11).

[0038] Meanwhile, the side grip (30) provided in the driving unit (50) is a component for gripping a pile (300) for construction as shown in FIG. 2, and is installed to protrude through an opening on the front side of the vibrating body (51). The side grip (30) is provided with first and second grip members (31)(32), and is rotatably installed on the vibrating body (51) so that the ends of the first and second grip members can be in close contact with each other or separated, and is driven by an actuator.

[0039] The above mounting part (20) is composed of a first hinge shaft (21) installed vertically (in the Z-axis direction of FIG. 2) on the upper side of the hammer body (11), a support member (22) rotatably installed on the first hinge shaft (21), and a support bracket (23) supported by a second hinge shaft (24) installed in the front-rear direction (in the Y-axis direction of FIG. 2) on the upper side of the support member (22). Accordingly, the hammer body (11) has a structure that allows it to rotate in the left-right direction (in the direction of arrow C of FIG. 2) relative to the support bracket (23).

[0040] And between the support member (22) and the hammer body (11), a swing unit (80) for rotating the hammer body (11) in the direction of arrow A relative to the support member (22) is provided, and a tilting unit (85) for tilting the hammer body (11) in the left and right directions relative to the support bracket (23) may be installed.

[0041] Meanwhile, the main hinge part (40) connecting the support bracket (23) of the mounting part (20) and the auxiliary boom (60) has a structure in which a first hinge bracket (41) is installed at a predetermined interval on the support bracket (23), and the end of the auxiliary boom (60) is connected to the first hinge bracket (41) by a main hinge shaft (42). It is preferable that the main hinge shaft (42) installed on the first hinge bracket (41) be installed perpendicular to the second hinge shaft (24), that is, in the direction of the X-axis of FIG. 2, so as to support the hammer body (11) so that it can be rotated by a predetermined angle in the forward and backward direction (direction of arrow B in FIG. 2) relative to the auxiliary boom (60).

[0042] The auxiliary boom (60) has a first extension (61) extending from a main hinge shaft (42) installed at the end, and a second extension (62) extending at a predetermined angle with respect to the first extension (61). It is preferable that the first extension (61) and the second extension (62) form approximately a right angle. Although not shown in the drawing, the second extension (62) may have a retractable structure.

[0043] And a connecting bracket (65) connected to the boom (210) of the excavator (200) is installed on the end side of the second extension (62). Two connecting pins (66) spaced apart from each other are installed on the connecting bracket (65). The lengths of the first and second extensions (61) (62) of the auxiliary boom (60) can be changed according to working conditions.

[0044] The above hammer posture maintaining part (70) may be composed of an actuator configured to adjust the rotation angle of the hammer body (11) in the forward and backward directions relative to the auxiliary boom (60) with respect to the main hinge part (20).

[0045] Specifically, the hammer posture maintaining part (70) is installed between the end of the first extension part (61) of the auxiliary boom (60) and the support bracket (23) of the mounting part (20), so as to maintain the posture of the side grip hammer (10), particularly the hammer body (11), rotated in the forward and backward directions in a “fixed state,” or to release the “fixed state” so that the hammer body (11) can rotate in a no-load state relative to the auxiliary boom (60) to have a degree of freedom of rotation in the forward and backward directions.

[0046] The above hammer posture maintenance unit (70) is equipped with an actuator, namely a hydraulic cylinder (71), installed on the first extension (61) of the auxiliary boom (60) and the support bracket (23). One side of the cylinder body (72) constituting the hydraulic cylinder is connected to the first extension (61) of the auxiliary boom (60) by a hinge shaft (61a) so as to be rotatable, and the other side of the rod (73) of the hydraulic cylinder is hinge-connected to a sub-hinge shaft (43) installed parallel to the main hinge shaft (42) on the first support bracket (23).

[0047] FIG. 4 shows another embodiment of the hammer posture maintaining unit (90). Among the components shown in this embodiment, the same reference numerals are used for components identical to those shown in FIG. 1 to FIG. 3, and a detailed description thereof is omitted.

[0048] Referring to FIG. 4, a position fixing member (92) having at least one fixing hole (91) formed therein is installed on an auxiliary boom (60) adjacent to the support bracket (23). Then, at a corresponding position on the support bracket (23), an actuator (95) is installed to move a fixing pin (93) forward and backward, which is coupled to the fixing hole (91) of the position fixing member (92) to fix the rotational position of the hammer body (11) or to release the fixed state of the hammer body (11) to maintain a no-load state for rotation. The actuator (95) may be a hydraulic cylinder, but is not limited thereto.

[0049] The above hammer posture maintaining part (23) is not limited to the embodiments described above, but may be a structure capable of fixing or releasing the rotational posture of the hammer body by fixing the mounting part to the auxiliary boom (60).

[0050] Meanwhile, the hammer posture maintenance unit (70) is equipped with an angle detection sensor (75) installed on the support bracket (23) or the hammer body (11) to detect an inclination, and a control unit (76) that controls a control valve (77) and a check valve (78) to drive the hydraulic cylinder (71) according to the angle detection value detected by the angle detection sensor (75) to correct or fix the posture of the hammer body (11) relative to the auxiliary boom (60) or maintain it in a no-load state.

[0051] The above control unit (76) can control a hydraulic cylinder (71), which is an actuator, as shown in the control circuit diagram in FIG. 3, to fix the position of the hammer body (11) suspended on the auxiliary boom (60) as described above, or maintain the rotational no-load state of the hammer body (10) relative to the main hinge axis (42).

[0052] The angle detection sensor (75) may be a gyroscope sensor capable of detecting the angle of the support bracket (23) to which the auxiliary boom (60) is attached, or detecting the angle of the hammer body (11) that tilts due to the eccentric movement of the center of gravity as the pile (300) is gripped by the side grip (30), but is not limited thereto.

[0053] The control unit (76) controls the hydraulic cylinder (71) in conjunction with the swing unit (80) that rotates the hammer body (11) in the direction of arrow A and the tilting unit (85) that rotates it in the direction of arrow C, thereby controlling the hammer body (11) to maintain the optimal posture for pile construction work.

[0054] The control of the hydraulic cylinder (71) by the above control unit (76) is achieved by a control valve (77) and a check valve for controlling the supply of hydraulic fluid for operation of the hydraulic cylinder (71).

[0055] Other embodiments of a side grip hammer with an auxiliary boom according to the present invention will be described below with reference to FIGS. 5 and 6. For components shown in this embodiment that are identical to those shown in FIGS. 1 to 3, the same reference numerals are used, and a detailed description thereof is omitted.

[0056] Referring to FIG. 5, the side grip hammer with an auxiliary boom of the present embodiment is characterized by further comprising a sub-tilting unit (100) that rotates the driving unit (50) relative to the hammer body (11) so that the side grip (30) can maintain any rotation angle within the range from a vertical state to a horizontal state.

[0057] The above sub-tilting unit (100) is structured such that a rotation axis (101) is rotatably installed on both sides of the hammer body (11), and a sub-body (102) that supports a driving unit (50) is installed on the rotation axis (101). Both sides of the driving unit (50) are supported by an elastic support unit (15) on the sub-body (102), thereby allowing the driving unit to vibrate up and down relative to the sub-body (102).

[0058] And a rotation link (103) is installed on at least one rotation axis (101) supporting the sub-body (102). This rotation link (103) has a structure that rotates at a predetermined angle by a tilting hydraulic cylinder (104), which is an actuator installed on the hammer body (11). The tilting hydraulic cylinder (104) rotates the hammer body (11), on which the driving unit (50) is installed, at any angle within the rotation range from the vertical state to the horizontal state of the side grip (30).

[0059] As shown in FIG. 6, a side grip hammer (10) with an auxiliary boom according to another embodiment of the present invention may omit the tilting unit (85) and only have a sub-tilting unit (100), unlike the embodiment shown in FIG. 5.

[0060] The side grip hammer (10) having an auxiliary boom according to the present invention configured as described above performs work in a state connected by the boom (210) of the excavator (200) and the connecting bracket (65) of the auxiliary boom (60) as shown in FIGS. 1, FIGS. 3 and FIGS. 7.

[0061] The side grip hammer (10) equipped with the above auxiliary boom (60) grips a pile (300) using the first and second grip members (31) (32) of the side grip (30) for construction work. Since the side grip (30) has a structure protruding to one side of the hammer body (11), the hammer body (51) suspended on the auxiliary boom (60) experiences an eccentric shift in its center of gravity.

[0062] The amount of eccentric displacement of the center of gravity is detected by the angle detection sensor (75) of the hammer posture maintenance unit (70), and the control unit (76) can correct or fix the posture of the auxiliary boom (60) of the hammer body (11), which is coupled by the auxiliary boom (60) and the main hinge unit (40), in the “arrow B direction” by controlling the hydraulic cylinder (71) based on the detected angle value to advance or retract the rod (73). The above correction or fixation of the rotational posture of the hammer body (11) can be performed in conjunction with the rotational operation in the “arrow A direction” by the swing unit (80) and the rotational operation in the “arrow C direction” by the tilting unit (85).

[0063] Correction or fixation of the position of the above-mentioned side grip hammer (10) as described above enables smooth setting work for the construction of the pile (300) held by the side grip (30).

[0064] And when the pile (300) is set up and the pile driving or pulling operation is performed, the control valve (77) and check valve (78) are controlled so that no load is applied by hydraulic fluid to the hydraulic cylinder (71) of the hammer position maintenance unit (70), thereby allowing the hammer body (11), which is connected by the auxiliary boom (60) and the main hinge shaft (42), to be maintained in a rotational no-load state. This prevents external force from being applied in a direction other than the construction direction of the pile (300), thereby increasing the precision of the construction.

[0065] The no-load state of the side grip hammer supported by the auxiliary boom (60) can be achieved in conjunction with the operation of the tilting unit (85) and the swing unit (80).

[0066] And as shown in FIG. 7, since the hammer construction work is performed with the auxiliary boom (60) connected to the boom of the excavator, the working area of ​​the hammer body (11) suspended at the end of the auxiliary boom (60), that is, the operating area of ​​the side grip hammer (10), can be greatly expanded.

[0067] Meanwhile, as shown in FIGS. 8 and 9, when a sub-tilting unit (100) is installed on the hammer body (11), the driving unit (50) itself, on which the side grip (30) is installed, can be rotated at any angle relative to the hammer body (11), so that a pile lying down can be gripped or a pile at any angle can be constructed.

[0068] By operating the tilting hydraulic cylinder (104) of the above sub-tilting unit (100), the sub-body (102) rotates the rotation axis (101) to an arbitrary angle, thereby rotating the drive unit (50) supported on the sub-body (102), so that the side grip (30) installed thereon can be maintained at an arbitrary angle within the rotation range from a vertical state to a horizontal state. Therefore, it is possible to grip a pile placed at an arbitrary angle and to construct a pile at an arbitrary angle.

[0069] As described above, the side grip hammer with an auxiliary boom according to the present invention can maintain the position of the side grip hammer or a no-load state, thereby improving the construction precision and workability of the pile, and since the driving unit can be rotated at any angle relative to the hammer body, the pile can be gripped by the side grip and the pile can be constructed at any angle.

[0070] The present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. In a side grip hammer coupled to the boom of heavy machinery, A hammer body having a mounting portion on the upper side; A vibrating body installed to vibrate by interposing an elastic support unit on the above hammer body; A side grip installed on the above-mentioned vibrating body to grip a file; A driving unit having a vibration generating part that drives the above-mentioned vibration body up and down; An auxiliary boom, one side of which is rotatably coupled in the forward and backward directions by means of the mounting part and the main hinge part of the hammer body, and the other side of which is coupled to the boom; and A side grip hammer having an auxiliary boom, characterized by having a hammer posture maintaining part that corrects and fixes the posture of a hammer body suspended on an auxiliary boom by the above main hinge part, or maintains a no-load state for the rotation of the hammer body.

2. In Paragraph 1, A side grip hammer having an auxiliary boom, characterized in that the above hammer posture maintaining part is equipped with an actuator configured to adjust the rotation angle of the hammer body in the front-rear direction relative to the auxiliary boom, centered on the main hinge part.

3. In Paragraph 2, A side grip hammer having an auxiliary boom, characterized in that the actuator of the hammer posture maintaining unit comprises a cylinder body hinged to the auxiliary boom and a hydraulic cylinder having a cylinder rod that can be moved in and out of the cylinder body and is hinged to the mounting unit by a sub-hinge shaft.

4. In Paragraph 1, The above hammer position maintaining member is characterized by having a position fixing member installed adjacent to the support bracket of the mounting member and having at least one fixing hole formed therein, and an actuator installed on the support bracket to release the connection of a fixing pin coupled to the fixing hole of the position fixing member, thereby forming a side grip hammer with an auxiliary boom.

5. In Paragraph 1, A side grip hammer having an auxiliary boom, characterized in that the hammer posture maintaining unit comprises an angle detection sensor installed in the mounting unit and a control unit that controls the operation of the actuator based on an angle value detected by the angle detection sensor.

6. In a side grip hammer coupled to the boom of heavy machinery, A hammer body having a mounting portion on the upper side; A sub-body rotatably installed by means of a rotating shaft installed on both sides of the hammer body: A vibrating body installed to enable vibration by interposing an elastic support unit on the above sub-body; A side grip installed on the above-mentioned vibrating body to grip a file; A driving unit having a vibration generating part that drives the above-mentioned vibration body up and down; An auxiliary boom, one side of which is rotatably connected in the forward and backward directions by the mounting part and the main hinge part of the hammer body, and the other side of which is connected to the boom; A hammer posture maintaining part that corrects and fixes the posture of the hammer body suspended on the auxiliary boom by the above main hinge part, or maintains a no-load state for the rotation of the hammer body; and A side grip hammer having an auxiliary boom, characterized by having a sub-tilting unit installed on the hammer body and rotating the sub-body and the drive unit around the rotation axis to adjust the side grip to be maintained at any angle within a rotation range from a vertical state to a horizontal state.

7. In Paragraph 6, A side grip hammer having an auxiliary boom, characterized in that the above sub-tilting unit comprises a rotating link installed on the rotation axis and an actuator installed on the side of the hammer body to rotate the rotating link.

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