A strong magnetic chuck type quick-release clamp for milling cutters

Abstract

This utility model discloses a high-strength magnetic chuck type quick-release fixture for milling cutters, comprising: a spindle and a milling cutter. The upper surface of the spindle's output shaft has an embedded magnetic groove. A gear plate and a magnetic chuck are sequentially fixed to the lower surface of the milling cutter. The milling cutter can be magnetically inserted into the magnetic groove via the magnetic chuck. Locking mechanisms are slidably installed at both ends of the output shaft. These locking mechanisms allow the magnetic chuck to automatically and synchronously move inward and engage with the gear plate while simultaneously sliding against the upper surface of the magnetic chuck. Through the design of the locking mechanism, the installation and removal of the milling cutter only requires insertion and pinching, eliminating the need for additional actions. This significantly improves the efficiency of high-frequency tool changing in multi-process, multi-tool machining scenarios, reducing equipment downtime, increasing processing output per unit time, helping companies meet urgent order demands, and improving customer satisfaction and market competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter clamping technology, specifically a strong magnetic chuck type milling cutter quick assembly and disassembly clamp. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling operations. During operation, the cutting teeth sequentially and intermittently remove the excess material from the workpiece. Milling cutters are mainly used on milling machines to machine planes, steps, grooves, shaped surfaces, and cut off workpieces.

[0003] For example, the national authorized patent announcement number CN215748818U discloses a milling cutter fixture, including a worktable and a base disposed at the bottom of the worktable, and further including: a clamping component disposed between the base and the worktable for clamping the milling cutter; and an elastic positioning component disposed on the base for automatically clamping and positioning the milling cutter; when the clamping component clamps and releases the milling cutter, the corresponding elastic positioning component releases the positioning and completes the positioning of the milling cutter, so as to facilitate the clamping component to change the clamping point. The milling cutter fixture provided by this utility model facilitates the clamping component to change the clamping point, and the clamping is stable, ensuring the accuracy and speed of clamping, making the operation simpler, and the clamping and positioning can be automatically switched.

[0004] However, the aforementioned milling cutter clamps use manual clamping methods such as bolts, which require multiple tightening of the bolts when changing the milling cutter, resulting in a long disassembly and assembly time and hindering quick replacement. Utility Model Content

[0005] The purpose of this utility model is to provide a strong magnetic chuck type quick-release and disassembly fixture for milling cutters, so as to solve the problems of the milling cutter fixtures proposed in the background art that use bolt manual clamping, which have long disassembly and assembly time and low efficiency when changing milling cutters, and are difficult to adapt to the needs of modern high-efficiency machining.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-strength magnetic chuck type quick-release clamp for milling cutters includes: a spindle and a milling cutter. The upper surface of the output shaft of the spindle is provided with an embedded magnetic groove. The lower surface of the milling cutter is sequentially fixed with a toothed disc and a magnetic chuck. The milling cutter can be magnetically inserted into the magnetic groove through the magnetic chuck. Locking mechanisms are slidably installed at both ends of the output shaft. The locking mechanisms allow the magnetic chuck to automatically and synchronously move inward and engage with the toothed disc while sliding against the upper surface of the magnetic chuck.

[0008] Preferably, the locking mechanism includes a first connecting plate and a second connecting plate. Both the first connecting plate and the second connecting plate are slidably installed inside the output shaft and both ends slide out from the outer surface of the output shaft. The other end of the first connecting plate and the second connecting plate is fixedly installed with a toothed plate. The two sets of toothed plates can be slidably inserted into the magnetic groove through the first connecting plate and the second connecting plate to engage with the toothed plate.

[0009] Preferably, a first reset rod and a second reset rod are fixedly installed on the lower surfaces of the first connecting plate and the second connecting plate, respectively, and one end of the first reset rod and the second reset rod slides out from both ends of the outer surface of the output shaft.

[0010] Preferably, guide plates are fixedly installed on the upper surfaces of the first connecting plate and the second connecting plate, and the guide plates slide in the guide groove. The guide groove is opened in the output shaft. One end of the guide plate is fixedly connected to one end of the first spring, and the other end of the first spring is fixedly connected to one end in the guide groove, so that the first spring can apply an inward elastic traction force to the first connecting plate and the second connecting plate.

[0011] Preferably, both ends of the first connecting plate and the second connecting plate are provided with triangular grooves, into which locking blocks can be inserted. The two sets of locking blocks are slidably installed in the guide rail groove, which is located on the upper surface of the magnetic suction groove. A pressure plate is fixedly installed between the two sets of locking blocks, and the pressure plate can slide through the guide rail groove to the upper end of the magnetic suction groove.

[0012] Preferably, a smooth groove is provided on one end of the inner side of each of the two sets of card blocks, so that when the card block is pressed down by the magnetic chuck through the pressure plate, the card block can slide out of the triangular groove and drive the smooth groove to be flush with the triangular groove. At this time, the first connecting plate and the second connecting plate will not be limited by the card block and can be driven by the elastic force applied by the first spring to move the toothed plate inward synchronously.

[0013] Preferably, the lower surface of the guide rail groove is fixedly connected to one end of the second spring, while the other end of the second spring is fixedly connected to the lower surface of the locking block, so that the second spring can apply an upward spring force to the locking block.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Through the design of the output shaft, magnetic groove, milling cutter, gear plate and locking mechanism, during installation, the milling cutter can be aligned with the output shaft of the spindle, and then the magnetic chuck on the lower surface of the milling cutter can be aligned with the magnetic groove. The strong magnetic force between the two will automatically guide the magnetic chuck to be inserted into the magnetic groove to achieve initial positioning. The magnetic self-centering ensures coaxiality. During the insertion of the magnetic chuck, it will press against the locking mechanism at both ends of the output shaft, so that the locking end will automatically move inward synchronously. This allows the locking mechanism to mesh with the gear plate installed on the milling cutter and slide against the upper surface of the magnetic chuck. In this way, the milling cutter is stabilized by mechanical locking and magnetic attraction.

[0016] During disassembly, the locking mechanism extending to both ends of the output shaft can be squeezed inwards to allow the locking end of the mechanism to slide outwards, disengaging from the gear plate and simultaneously sliding out from the upper surface of the magnetic chuck. This releases the mechanical lock, allowing the milling cutter to be pulled upwards, which in turn disengages the magnetic chuck from the magnetic groove, completing the disassembly. Simultaneously, the locking mechanism returns to its initial position under the squeezing action, preparing for the next installation. The installation and disassembly of the milling cutter only require insertion and squeezing, without any additional actions. In multi-process, multi-tool machining scenarios, the improved high-frequency tool changing efficiency significantly reduces equipment downtime, increases processing output per unit time, helps companies meet urgent order demands, and enhances customer satisfaction and market competitiveness.

[0017] 2. Through the design of the pressure plate, the locking block, the second spring, the second connecting plate, the first connecting plate, the first reset rod, the second reset rod, the triangular groove, and the first spring, the magnetic chuck is aligned with the magnetic groove. During the process of automatically guiding the magnetic chuck into the magnetic groove using the strong magnetic force between the two, the magnetic chuck will press against the upper surface of the pressure plate that is slidably installed in the guide rail groove. The pressure plate, which is pressed, can slide into the guide rail groove by squeezing the second spring through the locking block. The locking block that slides into the guide rail groove can then slide out from the triangular groove on the first and second connecting plates, making the smooth groove opened on the inner side of the upper end flush with the triangular groove on the first and second connecting plates. This releases the restriction on the first and second connecting plates, thereby releasing the inward elastic traction force of the first spring. This pulls the connecting plate and causes the toothed plate to slide inward, which in turn causes the toothed plate to insert into the magnetic groove and bite into the toothed plate while sliding against the upper surface of the magnetic chuck. This achieves the effect of mechanical locking and magnetic attraction to stabilize the milling cutter.

[0018] During disassembly, the first and second reset rods can be squeezed inwards. This squeezing will push the second and first connecting plates towards the outer surface of the output shaft, respectively. Once the first and second reset rods slide to their ends, they will simultaneously align the triangular grooves on both sides of the first and second connecting plates. When the two sets of triangular grooves are aligned, they will also align with the locking block. This allows the locking block to be pushed back into the magnetic groove by the spring force applied by the second spring, and simultaneously snap into the triangular groove. The two sets of connecting plates are simultaneously subjected to a limiting force, and the pressure plate that pops out from the magnetic suction groove will also press against the lower surface of the magnetic suction cup. The two sets of toothed plates that are pulled outward will also disengage from the toothed plate and slide out from the upper surface of the magnetic suction cup. The toothed plates that are pulled outward can slide outward in the guide groove through the guide plates fixedly installed on the first and second connecting plates and pull the first spring to accumulate potential energy. After the mechanical lock is released, the milling cutter can be pulled out upward to complete the disassembly. The popped-out pressure plate can return to the initial position to prepare for the next installation of the milling cutter. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall disassembly and assembly of the milling cutter of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the present invention.

[0021] Figure 3 This is a schematic diagram of the locking mechanism of this utility model.

[0022] In the diagram: 1. Spindle; 101. Output shaft; 102. Magnetic groove; 103. Milling cutter; 104. Gear plate; 105. Magnetic chuck; 106. Guide rail groove; 107. Guide groove; 2. Locking mechanism; 201. Pressure plate; 202. Locking block; 203. Second spring; 204. Second connecting plate; 205. Gear plate; 206. Second reset rod; 207. First reset rod; 208. Smooth groove; 209. Triangular groove; 210. First connecting plate; 211. First spring; 212. Guide plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-2As shown, a strong magnetic chuck type quick-release fixture for milling cutters includes: a spindle 1 and a milling cutter 103. The upper surface of the output shaft 101 of the spindle 1 is provided with an embedded magnetic groove 102. The lower surface of the milling cutter 103 is sequentially fixed with a toothed disc 104 and a magnetic chuck 105. The milling cutter 103 can be magnetically inserted into the magnetic groove 102 through the magnetic chuck 105. Locking mechanisms 2 are slidably installed at both ends of the output shaft 101. The locking mechanisms 2 allow the magnetic chuck 105 to automatically and synchronously move inward and engage with the toothed disc 104 while sliding against the upper surface of the magnetic chuck 105.

[0025] Through the design of the output shaft 101, magnetic groove 102, milling cutter 103, gear plate 104 and locking mechanism 2, during installation, the milling cutter 103 can be aligned with the output shaft 101 of the spindle 1, and then the magnetic chuck 105 on the lower surface of the milling cutter 103 can be aligned with the magnetic groove 102. The strong magnetic force between the two will automatically guide the magnetic chuck 105 to be inserted into the magnetic groove 102 to achieve initial positioning. The magnetic force self-centering ensures coaxiality, and during the insertion of the magnetic chuck 105, it will press against the locking mechanism 2 at both ends of the output shaft 101, so that the locking end will automatically and synchronously move inward. This allows the locking mechanism 2 to mesh with the gear plate 104 installed on the milling cutter 103 while sliding against the upper surface of the magnetic chuck 105. In this way, the milling cutter 103 is stabilized by mechanical locking and magnetic attraction.

[0026] During disassembly, the locking mechanism 2, which extends through both ends of the outer surface of the output shaft 101, can be squeezed inwards to allow the locking end of the locking mechanism 2 to slide outwards, thus disengaging from the gear plate 104 and simultaneously sliding out from the upper surface of the magnetic chuck 105. This releases the mechanical lock, allowing the milling cutter 103 to be pulled upwards, which in turn causes the magnetic chuck 105 to disengage from the magnetic groove 102, completing the disassembly. Simultaneously, the locking mechanism 2 returns to its initial position under the squeezing action, preparing for the next installation. The installation and disassembly of the milling cutter 103 only requires insertion and squeezing, without any additional actions. In multi-process, multi-tool machining scenarios, the improved high-frequency tool changing efficiency significantly reduces equipment downtime, increases processing output per unit time, helps enterprises meet urgent order demands, and enhances customer satisfaction and market competitiveness.

[0027] like Figure 3 As shown, the locking mechanism 2 includes a first connecting plate 210 and a second connecting plate 204. Both the first connecting plate 210 and the second connecting plate 204 are slidably installed inside the output shaft 101 and both ends slide out from the outer surface of the output shaft 101. The other ends of the first connecting plate 210 and the second connecting plate 204 are fixedly installed with toothed plates 205. The two sets of toothed plates 205 can be slidably inserted into the magnetic groove 102 through the first connecting plate 210 and the second connecting plate 204 to engage with the toothed plate 104.

[0028] The lower surfaces of the first connecting plate 210 and the second connecting plate 204 are respectively fixedly installed with the first reset rod 207 and the second reset rod 206, and one end of the first reset rod 207 and the second reset rod 206 slides out from both ends of the outer surface of the output shaft 101.

[0029] Guide plates 212 are fixedly installed on the upper surfaces of the first connecting plate 210 and the second connecting plate 204. The guide plates 212 slide in the guide groove 107, which is opened in the output shaft 101. One end of the guide plate 212 is fixedly connected to one end of the first spring 211, and the other end of the first spring 211 is fixedly connected to one end in the guide groove 107, so that the first spring 211 can apply an inward elastic traction force to the first connecting plate 210 and the second connecting plate 204.

[0030] Both ends of the first connecting plate 210 and the second connecting plate 204 are provided with triangular grooves 209. The triangular grooves 209 can be inserted into the locking blocks 202. The two sets of locking blocks 202 are slidably installed in the guide rail groove 106. The guide rail groove 106 is opened on the upper surface of the magnetic suction groove 102. A pressure plate 201 is fixedly installed between the two sets of locking blocks 202. The pressure plate 201 can slide through the guide rail groove 106 to the upper end of the magnetic suction groove 102.

[0031] Both sets of locking blocks 202 have a smooth groove 208 on one inner end. When the locking block 202 is pressed down by the magnetic chuck 105 through the pressure plate 201, the locking block 202 can slide out of the triangular groove 209 and drive the smooth groove 208 to be flush with the triangular groove 209. At this time, the first connecting plate 210 and the second connecting plate 204 will not be limited by the locking block 202 and can drive the toothed plate 205 to slide inward synchronously through the elastic force applied by the first spring 211.

[0032] The lower surface inside the guide rail groove 106 is fixedly connected to one end of the second spring 203, while the other end of the second spring 203 is fixedly connected to the lower surface of the locking block 202, so that the second spring 203 can apply an upward spring force to the locking block 202.

[0033] Through the design of the pressure plate 201, the locking block 202, the second spring 203, the second connecting plate 204, the first connecting plate 210, the first reset rod 207, the second reset rod 206, the triangular groove 209, and the first spring 211, the magnetic chuck 105 is aligned with the magnetic groove 102. During the process of automatically guiding the magnetic chuck 105 into the magnetic groove 102 using the strong magnetic force between them, the magnetic chuck 105 will press against the upper surface of the pressure plate 201, which is slidably installed in the guide rail groove 106. The pressure plate 201, under pressure, can then be pushed by the locking block 202 to retract into the guide rail groove 106 by squeezing the second spring 203. The locking block 202, which retracts into the guide rail groove 106, further contributes to this effect. Block 202 can slide out from the triangular groove 209 on the first connecting plate 210 and the second connecting plate 204, and make the smooth groove 208 opened on the inner side of the upper end flush with the triangular groove 209 on the first connecting plate 210 and the second connecting plate 204, thus releasing the restriction on the first connecting plate 210 and the second connecting plate 204. This allows the inward elastic traction force of the first spring 211 to be released, pulling the connecting plate and causing the toothed plate 205 to slide inward. This allows the toothed plate 205 to be inserted into the magnetic suction groove 102 and engage with the toothed plate 104, while simultaneously sliding against the upper surface of the magnetic suction cup 105, achieving the effect of mechanical locking and magnetic attraction to stabilize the milling cutter 103.

[0034] During disassembly, the first reset rod 206 and the second reset rod 207 can be squeezed inwards. This squeezing will cause the second connecting plate 204 and the first connecting plate 210 to be pushed towards the outer surface of the output shaft 101, respectively. Once the first reset rod 206 and the second reset rod 207 have slid to their ends, the triangular grooves 209 on both sides of the first connecting plate 210 and the second connecting plate 204 will be aligned. When the two sets of triangular grooves 209 are aligned, they will also be aligned with the locking block 202. This allows the locking block 202 to be pushed back into the magnetic groove 102 by the spring force applied by the second spring 203, and simultaneously locking the locking block 202. When the two sets of connecting plates are simultaneously subjected to a limiting force in the triangular groove 209, the pressure plate 201 that pops out from the magnetic suction groove 102 will also press against the lower surface of the magnetic suction cup 105. The two sets of toothed plates 205 that are pulled outward will also disengage from the toothed plate 104 and slide out from the upper surface of the magnetic suction cup 105. The toothed plates 205 that are pulled outward can slide outward in the guide groove 107 through the guide plate 212 fixedly installed on the first connecting plate 210 and the second connecting plate 204, and pull the first spring 211 to accumulate potential energy. After the mechanical lock is released, the milling cutter 103 can be pulled out upward to complete the disassembly. The popped-out pressure plate 201 can return to the initial position, preparing for the next installation of the milling cutter 103.

[0035] Based on the above technical solution, the working steps of this solution are summarized as follows: During installation, the milling cutter 103 can be aligned with the output shaft 101 of the spindle 1, and then the magnetic chuck 105 on the lower surface of the milling cutter 103 can be aligned with the magnetic groove 102. The strong magnetic force between the two will automatically guide the magnetic chuck 105 into the magnetic groove 102 to achieve initial positioning. The coaxiality is ensured by using magnetic self-centering. During the insertion of the magnetic chuck 105, it will press against the upper surface of the pressure plate 201 that is slidably installed in the guide rail groove 106. The pressure plate 201, under pressure, can slide into the guide rail groove 106 by squeezing the second spring 203 through the locking block 202. The retracted locking block 202 can slide out from the triangular groove 209 on the first connecting plate 210 and the second connecting plate 204, and make the smooth groove 208 opened on the inner side of the upper end flush with the triangular groove 209 on the first connecting plate 210 and the second connecting plate 204, thus releasing the restriction on the first connecting plate 210 and the second connecting plate 204. This allows the inward elastic traction force of the first spring 211 to be released, pulling the connecting plate and causing the toothed plate 205 to slide inward. This allows the toothed plate 205 to be inserted into the magnetic suction groove 102 and engage with the toothed plate 104, while simultaneously sliding against the upper surface of the magnetic suction plate 105, achieving the effect of mechanical locking and magnetic attraction to stabilize the milling cutter 103.

[0036] During disassembly, the first reset rod 206 and the second reset rod 207 can be squeezed inwards. This squeezing will cause the second connecting plate 204 and the first connecting plate 210 to be pushed towards the outer surface of the output shaft 101, respectively. Once the first reset rod 206 and the second reset rod 207 have slid to their ends, the triangular grooves 209 on both sides of the first connecting plate 210 and the second connecting plate 204 will be aligned. When the two sets of triangular grooves 209 are aligned, they will also be aligned with the locking block 202. This allows the locking block 202 to be pushed back into the magnetic groove 102 by the spring force applied by the second spring 203, and simultaneously locking the locking block 202. When the two sets of connecting plates are simultaneously subjected to a limiting force in the triangular groove 209, the pressure plate 201 that pops out from the magnetic suction groove 102 will also press against the lower surface of the magnetic suction cup 105. The two sets of toothed plates 205 that are pulled outward will also disengage from the toothed plate 104 and slide out from the upper surface of the magnetic suction cup 105. The toothed plates 205 that are pulled outward can slide outward in the guide groove 107 through the guide plate 212 fixedly installed on the first connecting plate 210 and the second connecting plate 204, and pull the first spring 211 to accumulate potential energy. After the mechanical lock is released, the milling cutter 103 can be pulled out upward to complete the disassembly. The popped-out pressure plate 201 can return to the initial position, preparing for the next installation of the milling cutter 103.

[0037] In summary, the installation and removal of the milling cutter 103 can be achieved simply by inserting and squeezing, without any additional actions. In multi-process, multi-tool machining scenarios, the improved high-frequency tool changing efficiency significantly reduces equipment downtime, increases processing output per unit time, helps enterprises meet urgent order demands, and enhances customer satisfaction and market competitiveness.

[0038] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A strong magnetic chuck type milling cutter quick dismounting clamp, characterized in that, include: The main spindle (1) and the milling cutter (103) have a magnetic groove (102) embedded in the upper surface of the output shaft (101) of the main spindle (1). The lower surface of the milling cutter (103) is fixedly mounted with a gear plate (104) and a magnetic chuck (105). The milling cutter (103) can be magnetically inserted into the magnetic groove (102) through the magnetic chuck (105). Both ends of the output shaft (101) are slidably mounted with locking mechanisms (2). The locking mechanisms (2) allow the magnetic chuck (105) to automatically and synchronously move inward and mesh with the gear plate (104) while sliding against the upper surface of the magnetic chuck (105).

2. The strong magnetic chuck type milling cutter quick dismounting clamp according to claim 1, characterized in that: The locking mechanism (2) includes a first connecting plate (210) and a second connecting plate (204). The first connecting plate (210) and the second connecting plate (204) are both slidably installed in the output shaft (101) and both ends slide out from the outer surface of the output shaft (101). The other ends of the first connecting plate (210) and the second connecting plate (204) are fixedly installed with toothed plates (205). The two sets of toothed plates (205) can be slid into the magnetic groove (102) through the first connecting plate (210) and the second connecting plate (204) to engage with the toothed disc (104).

3. The strong magnetic chuck type milling cutter quick dismounting clamp according to claim 2, characterized in that: The first reset rod (207) and the second reset rod (206) are fixedly installed on the lower surfaces of the first connecting plate (210) and the second connecting plate (204), respectively. One end of the first reset rod (207) and the second reset rod (206) slide out from both ends of the outer surface of the output shaft (101).

4. The strong magnetic chuck type milling cutter quick dismounting clamp according to claim 2, characterized in that: Guide plates (212) are fixedly installed on the upper surfaces of the first connecting plate (210) and the second connecting plate (204), and the guide plates (212) slide in the guide groove (107). The guide groove (107) is opened in the output shaft (101). One end of the guide plate (212) is fixedly connected to one end of the first spring (211), and the other end of the first spring (211) is fixedly connected to one end in the guide groove (107), so that the first spring (211) can apply an inward elastic traction force to the first connecting plate (210) and the second connecting plate (204).

5. The strong magnetic chuck type milling cutter quick dismounting clamp according to claim 4, characterized in that: Both ends of the first connecting plate (210) and the second connecting plate (204) are provided with triangular grooves (209). The triangular grooves (209) can be inserted into the locking blocks (202), and the two sets of locking blocks (202) are slidably installed in the guide rail groove (106). The guide rail groove (106) is opened on the upper surface of the magnetic suction groove (102), and a pressure plate (201) is fixedly installed between the two sets of locking blocks (202). The pressure plate (201) can slide through the guide rail groove (106) to the upper end of the magnetic suction groove (102).

6. The strong magnetic chuck type milling cutter quick dismounting clamp according to claim 5, characterized in that: Both sets of the card blocks (202) have a smooth groove (208) on one end of their inner side. When the card block (202) is pressed down by the magnetic chuck (105) through the pressure plate (201), the card block (202) can slide out of the triangular groove (209) and drive the smooth groove (208) to be flush with the triangular groove (209). At this time, the first connecting plate (210) and the second connecting plate (204) will not be limited by the card block (202) and can drive the toothed plate (205) to slide inward synchronously through the elastic force applied by the first spring (211).

7. A strong magnetic chuck type quick-release clamping fixture for end mills according to claim 5, characterized in that: The lower surface of the guide rail groove (106) is fixedly connected to one end of the second spring (203), while the other end of the second spring (203) is fixedly connected to the lower surface of the locking block (202), so that the second spring (203) can apply an upward spring force to the locking block (202).

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