Code scanning gun shell connecting mechanism

Abstract

The utility model relates to the technical field of code scanning guns, in particular to a code scanning gun shell connecting mechanism, which comprises a contour strip and a contour groove which are respectively arranged on the opposite surfaces of the edge of a left half shell and a right half shell, and the contour strip is matched with the contour groove and is used for restraining the vertical degree of freedom and the longitudinal degree of freedom between the left half shell and the right half shell. The connecting mechanism further comprises a first inserting piece arranged in the left half grip and a first locking piece arranged in the right half grip. The guide rod is pushed upwards to be in linkage with the first locking piece and the second locking piece, mounting positions of the first inserting piece and the second inserting piece are vacated, or locking and fixing of the first inserting piece and the second inserting piece are removed, the first locking piece facilitates assembly of the left half shell and the right half shell, and the second locking piece facilitates one-key disassembly and separation of the left half shell and the right half shell. The disassembly or assembly operation is easy and efficient, the assembly or disassembly steps of the code scanning gun shell are simplified, and the assembly or disassembly efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of barcode scanner technology, and in particular to a barcode scanner housing connection mechanism. Background Technology

[0002] A barcode scanner, also known as a barcode reader, is generally used to scan QR codes or barcodes on product packaging to read relevant product information. This helps reduce manual data entry time, lower error rates, and improve work efficiency. The scanner's casing is typically assembled from two symmetrical outer shells. The casing includes a handle and a body. During assembly, multiple corresponding screw holes are provided on the opposite surfaces of the handle and body of both the left and right outer shells. Screws are then tightened between the corresponding screw holes to secure the two outer shells together. However, subsequent disassembly, repair, and installation require removing or installing multiple screws, resulting in numerous steps and significantly impacting installation and disassembly efficiency.

[0003] To address the aforementioned technical problems, existing patent application number 202323339750.5 discloses a barcode scanner latching structure and a barcode scanner with this structure. The first latching component is fixed to the upper surface of the handle, and a quick connection between the handle and the housing is achieved through the latching connection between the first latching component and the first latching hole. This is convenient, quick, improves production assembly efficiency, and facilitates later maintenance and disassembly. In the aforementioned prior art, the connection between the housing and the handle, and between the left and right halves of the handle, is achieved through interference fits. This makes disassembly and maintenance difficult and prone to damage to the latching components due to operational errors. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a barcode scanner housing connection mechanism to solve the problem that repeated disassembly can cause deformation or wear of the fasteners under the influence of compressive force, thus affecting the stability and firmness of the snap-fit ​​connection.

[0005] To achieve the above objectives, this utility model provides a barcode scanner housing connection mechanism, including contour strips and contour grooves respectively disposed on the opposite surfaces of the left and right halves of the housing. The contour strips and contour grooves are matched and used to constrain the vertical and longitudinal degrees of freedom between the left and right halves of the housing. The connection mechanism further includes:

[0006] A first insert is provided in the left half of the grip and a first locking member is provided in the right half of the grip. The first locking member matches the first insert and is used to fix the left half of the grip and the right half of the grip in place.

[0007] The second plug is located in the left half of the gun body and the second locking member is located in the right half of the gun body. The second locking member matches the second plug and is used to fix the left half of the gun body and the right half of the gun body together.

[0008] A linkage component is provided between the first locking component and the second locking component, the linkage component being used to synchronously link the locking or releasing actions of the first locking component and the second locking component.

[0009] Preferably, the first plug includes two vertical support bars fixed relatively vertically inside the left half of the grip and at least one vertical insertion block vertically disposed on the support bars, wherein a vertical insertion hole is connected between the top and bottom of the vertical insertion block.

[0010] Preferably, one of the vertical surfaces of the vertical support bar is flush with the vertical surface of the left half-grip facing the right half-grip, and the vertical insert is located on the outer vertical surface of the vertical support bar facing the right half-grip.

[0011] Preferably, the first lock includes two vertical bars disposed opposite to each other within the right half of the handle and at least one vertical slot disposed on the vertical bars. The vertical slot matches the vertical insert block. Both of the two vertical bars have an outer through groove on their opposite surfaces. The bottom of the outer through groove communicates with the top of the vertical slot. A connecting rod is disposed between the two outer through grooves. Both ends of the bottom of the connecting rod are provided with vertical insert rods, which match the vertical insert holes.

[0012] Preferably, one of the vertical surfaces of the vertical bar is flush with the vertical surface of the right half-grip facing the left half-grip, and the opening of the vertical slot is located on the vertical surface of the vertical bar facing the left half-grip.

[0013] Preferably, the second plug-in includes a horizontal support bar fixed to the top of the left half of the gun body and at least one horizontal insertion block fixed to the horizontal support bar. The horizontal insertion block has a horizontal insertion hole along the axial direction of the horizontal support bar. The horizontal support bar is parallel to the right half of the gun body, and one of the vertical surfaces of the horizontal support bar is flush with the vertical surface of the left half of the gun body facing the right half of the gun body. The horizontal insertion block is located on the vertical surface of the horizontal support bar facing the right half of the gun body.

[0014] Preferably, the second locking component includes at least two guide blocks arranged side by side at the top of the right half of the gun body and a limiting frame fixed to the top of the right half of the gun body. A horizontal insertion rod is inserted through the guide block, the horizontal insertion rod matches the horizontal insertion hole, a horizontal connecting rod is fixedly provided at one end of the horizontal insertion rod, and a horizontal slide bar is fixedly provided at one end of the horizontal connecting rod. The horizontal slide bar is located inside the limiting frame and between the guide blocks.

[0015] Preferably, the axis of the horizontal insert rod and the axis of the horizontal slide bar are coplanar and parallel, and the axis of the horizontal insert rod and the axis of the horizontal connecting rod are coplanar and perpendicular.

[0016] Preferably, the linkage includes a through hole at the bottom of the right half grip and an inner through groove connecting the inside of the right half grip and the inside of the right half gun body. A guide rod is inserted between the inner through groove and the through hole. The guide rod is fixed to the outside of the connecting rod. Two connecting arms are hinged to the top of the guide rod. One end of each connecting arm is hinged to the opposite end of two horizontal slide bars. A compression spring is slidably sleeved on the outside of the guide rod. The two ends of the compression spring are fixed to the outside of the guide rod and the top of the inside of the right half grip, respectively.

[0017] The beneficial effects of this utility model are:

[0018] This invention utilizes the interaction between a first insert on the left half of the grip and a first locking member on the right half of the grip, as well as the interaction between a second insert on the left half of the gun body and a second locking member on the right half of the gun body. After the left and right halves of the housing are precisely aligned, the pushing force of the linkage is removed, releasing the accumulated spring force. This pushes the guide rod to reset and simultaneously pulls the first and second locking members to reset, locking the first and second inserts respectively. This completes the assembly of the left and right halves of the housing. Disassembly simply requires pushing the guide rod upwards, causing the first and second locking members to engage and lock the first and second inserts, thus separating the left and right halves of the housing. This simplifies the installation and disassembly steps of the barcode scanner housing, improves installation and disassembly efficiency, and facilitates efficient maintenance and disassembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ;

[0021] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ;

[0022] Figure 3 This is a three-dimensional illustration of the present invention. Figure 3 ;

[0023] Figure 4 This is a three-dimensional illustration of the present invention. Figure 4 ;

[0024] Figure 5 This is a three-dimensional illustration of the present invention. Figure 5 ;

[0025] Figure 6 This is a three-dimensional illustration of the present invention. Figure 6 ;

[0026] Figure 7 for Figure 5 The main view.

[0027] The diagram is marked as follows:

[0028] 1. Outline strip; 2. Outline groove; 3. First insert; 31. Vertical support bar; 32. Vertical insertion block; 33. Vertical insertion hole; 4. First locking component; 41. Vertical bar; 42. Vertical slot; 43. External through groove; 44. Connecting rod; 45. Vertical insertion rod; 5. Second insert; 51. Horizontal support bar; 52. Horizontal insertion block; 53. Horizontal insertion hole; 6. Second locking component; 61. Guide block; 62. Horizontal insertion rod; 63. Horizontal connecting rod; 64. Horizontal slide bar; 65. Limiting frame; 7. Linkage component; 71. Through hole; 72. Internal through groove; 73. Guide rod; 74. Compression spring; 75. Connecting arm. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] like Figures 1 to 5 , Figure 7 As shown, a barcode scanner housing connection mechanism includes contour strips 1 and contour grooves 2 respectively disposed on the opposite surfaces of the left and right halves of the housing. The contour strips 1 and contour grooves 2 are matched and used to constrain the vertical and longitudinal degrees of freedom between the left and right halves of the housing. The left half of the housing includes a left half of the gun body and a left half of the grip, with the left half of the grip fixedly disposed at the bottom of the left half of the gun body. The right half of the housing includes a right half of the gun body and a right half of the grip, with the right half of the grip fixedly disposed at the bottom of the right half of the gun body. The connection mechanism further includes:

[0032] A first insert 3 is provided in the left half of the grip and a first locking member 4 is provided in the right half of the grip. The first locking member 4 matches the first insert 3 and is used to fix the left half of the grip and the right half of the grip in place.

[0033] The second plug-in 5 is located in the left half of the gun body and the second locking member 6 is located in the right half of the gun body. The second locking member 6 matches the second plug-in 5 and is used to fix the left half of the gun body and the right half of the gun body together.

[0034] A linkage 7 is located between the first locking member 4 and the second locking member 6. The linkage 7 is used to synchronously link the locking or releasing actions of the first locking member 4 and the second locking member 6. This allows the linkage 7 to be driven first during the assembly of the left and right halves of the housing, enabling the left and right halves to align. This allows the first insert 3 to engage with the first locking member 4, and the second insert 5 to engage with the second locking member 6, aligning the opposing surfaces of the left and right halves and causing them to abut against each other. At this point, the contour strip 1 is inserted into the contour groove 2, allowing the force pushing the linkage 7 to be removed, causing the linkage 7 to automatically reset and synchronously link the first locking member 4 and the second locking member 6. By resetting and locking the first plug-in 3 and the second plug-in 5, the assembly and fixing operation between the left and right halves of the shell can be completed. During disassembly, simply push the linkage 7 again to make the first locking piece 4 and the second locking piece 6 operate synchronously and release the lock on the first plug-in 3 and the second plug-in 5, realizing one-click disassembly. There is no interference fit between the first plug-in 3 and the first locking piece 4, and between the second plug-in 5 and the second locking piece 6 during the installation or disassembly process. This avoids the wear problem caused by interference fit and prevents operational errors, thus avoiding damage during disassembly. It also greatly simplifies the disassembly steps and improves the efficiency of disassembly or installation.

[0035] like Figure 2 , Figure 3 , Figures 4 to 7 As shown, the first plug-in 3 includes two vertical support bars 31 fixed relatively vertically inside the left half of the grip and at least one vertical insertion block 32 vertically disposed on the vertical support bars 31, with a vertical insertion hole 33 communicating between the top and bottom of the vertical insertion block 32.

[0036] One of the vertical surfaces of the vertical support bar 31 is flush with the vertical surface of the left half grip facing the right half grip, and the vertical insert block 32 is located on the vertical surface of the vertical support bar 31 facing the right half grip.

[0037] The first locking component 4 includes two vertical bars 41 disposed opposite to each other in the right half of the handle and at least one vertical slot 42 disposed on the vertical bars 41. The vertical slot 42 matches the vertical insert block 32. Both of the two vertical bars 41 are provided with external through grooves 43 on their opposite surfaces. The bottom of the external through groove 43 communicates with the top of the vertical slot 42. A connecting rod 44 is provided between the two external through grooves 43. Both ends of the bottom of the connecting rod 44 are provided with vertical insert rods 45. The vertical insert rods 45 match the vertical insert holes 33.

[0038] One of the vertical surfaces of the vertical bar 41 is flush with the vertical surface of the right half of the grip facing the left half of the grip, and the opening of the vertical slot 42 is located on the vertical surface of the vertical bar 41 facing the left half of the grip.

[0039] When the left and right halves of the grip are joined together, the connecting rod 44 and the vertical insertion rod 45 can be driven to move upward synchronously by pushing the linkage 7. This allows the vertical insertion rod 45 to retract completely from the inside of the vertical slot 42 into the inside of the outer through groove 43. This facilitates the insertion of the vertical insertion block 32 into the inside of the vertical slot 42 during installation, or the removal of the vertical insertion block 32 from the vertical slot 42 during disassembly. This makes it easy to fix or separate the left and right halves of the grip. The entire process is without interference fit, which avoids deformation and wear caused by interference fit between parts, as well as the problem of damage to parts caused by force deviation during interference fit. It also allows for quick and efficient disassembly or fixed installation with a push.

[0040] like Figures 2 to 7 As shown, the second plug-in 5 includes a horizontal support bar 51 fixed to the top of the left half of the gun body and at least one horizontal insertion block 52 fixed to the horizontal support bar 51. The horizontal insertion block 52 is provided with a horizontal insertion hole 53 along the axial direction of the horizontal support bar 51. The horizontal support bar 51 is parallel to the right half of the gun body, and one of the vertical surfaces of the horizontal support bar 51 is flush with the vertical surface of the left half of the gun body facing the right half of the gun body. The horizontal insertion block 52 is located on the vertical surface of the horizontal support bar 51 facing the right half of the gun body.

[0041] The second locking component 6 includes at least two guide blocks 61 arranged side by side at the top of the right half of the gun body and a limiting frame 65 fixed to the top of the right half of the gun body. Two adjacent horizontal insertion blocks 52 are located between two adjacent guide blocks 61. A horizontal insertion rod 62 is inserted through the guide block 61. The horizontal insertion rod 62 matches the horizontal insertion hole 53. A horizontal connecting rod 63 is fixedly provided at one end of the horizontal insertion rod 62. A horizontal sliding strip 64 is fixedly provided at one end of the horizontal connecting rod 63. The horizontal sliding strip 64 is located inside the limiting frame 65 and between the guide blocks 61.

[0042] The axis of the horizontal insertion rod 62 is coplanar and parallel to the axis of the horizontal slide bar 64, and the axis of the horizontal insertion rod 62 is coplanar and perpendicular to the axis of the horizontal connecting rod 63, with one end of the horizontal insertion rod 62 facing the left half of the handle.

[0043] The linkage 7 includes a through hole 71 at the bottom of the right half grip and an inner through groove 72 connecting the inside of the right half grip and the right half gun body. A guide rod 73 is inserted between the inner through groove 72 and the through hole 71. The guide rod 73 is fixed to the outside of the connecting rod 44. Two connecting arms 75 are hinged to the top of the guide rod 73. One end of the two connecting arms 75 is respectively hinged to the opposite ends of the two horizontal slide bars 64. A compression spring 74 is slidably sleeved on the outside of the guide rod 73. The two ends of the compression spring 74 are respectively fixed to the outside of the guide rod 73 and the top of the inside of the right half grip. The compression spring 74 is located between the connecting rod 44 and the top of the inside of the right half grip.

[0044] When the guide rod 73 is pushed up, the connecting rod 44 moves upward synchronously and the two horizontal slide bars 64 move away from each other. The linear movement direction of the horizontal slide bars 64 ensures that the action of the vertical insertion rod 45 completely disengaging from the vertical insertion hole 33 and the action of the horizontal insertion rod 62 completely disengaging from the horizontal insertion hole 53 are synchronized, achieving one-click disassembly and separation between the left and right halves of the housing. Similarly, when assembling the two halves, the guide rod 73 is pushed up to move the vertical insertion rod 45 and the horizontal insertion rod 62 away from their respective insertion positions on the vertical insertion block 32 and the horizontal insertion block 52, allowing the vertical insertion block 32 and the horizontal insertion block 52 to be properly inserted, ensuring that the vertical insertion hole 33 and the vertical insertion rod 45 are coaxial. Simultaneously, the horizontal insertion hole 53 and the horizontal insertion rod 62 are coaxially related, so that when the force of the upward push guide rod 73 is removed, the downward push guide rod 73 is reset under the elastic force stored in the compression spring 74, so that the vertical insertion rod 45 and the horizontal insertion rod 62 are simultaneously inserted into the corresponding vertical insertion hole 33 and the horizontal insertion hole 53, completing the interlocking fixation between the first plug 3 and the first locking piece 4, and between the second plug 5 and the second locking piece 6. This completes the fixed connection between the left half shell and the right half shell, so that the installation or disassembly operation between the left half shell and the right half shell can be completed with one push, greatly simplifying the installation or disassembly steps and improving the efficiency of installation or disassembly.

[0045] Working principle: When the guide rod 73 is pushed upward, it drives the connecting rod 44 to move upward synchronously. Under the push of the connecting arm 75, the two horizontal slide bars 64 move away from each other, realizing the synchronous linkage of the upward movement of the connecting rod 44 and the mutual movement of the two horizontal slide bars 64. This allows the vertical insertion rod 45 to move upward synchronously and completely disengage from the vertical insertion hole 33, and the horizontal insertion rod 62 to move horizontally synchronously and completely disengage from the horizontal insertion hole 53. This ensures that the actions of the first locking piece 4 and the second locking piece 6 are consistent, achieving one-click disassembly and separation between the left and right halves of the housing. When assembling the two halves, the guide rod 73 is pushed upward in the same way, causing the vertical insertion rod 45 and the horizontal insertion rod 62 to move away from the insertion positions of the vertical insertion block 32 and the horizontal insertion block 52, respectively, so that the vertical insertion block... The vertical insertion hole 32 and the horizontal insertion block 52 are inserted into place to ensure that the vertical insertion hole 33 and the vertical insertion rod 45 are coaxial. At the same time, the horizontal insertion hole 53 and the horizontal insertion rod 62 are coaxial, so that when the force of the upward push guide rod 73 is removed, the downward push guide rod 73 is reset under the elastic force stored in the compression spring 74, so that the vertical insertion rod 45 and the horizontal insertion rod 62 are simultaneously inserted into the corresponding vertical insertion hole 33 and horizontal insertion hole 53. This completes the interlocking and fixing between the first plug 3 and the first locking piece 4, and between the second plug 5 and the second locking piece 6, thus completing the fixed connection between the left half shell and the right half shell. This allows the installation or disassembly of the left half shell and the right half shell to be completed with a single push, greatly simplifying the installation or disassembly steps and improving the efficiency of installation or disassembly.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0047] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A code scanning gun housing connecting mechanism, comprising a profiled strip (1) and a profiled groove (2) respectively arranged on the opposite faces of the left half housing side and the right half housing side, the profiled strip (1) and the profiled groove (2) are matched and used to constrain the vertical and longitudinal degrees of freedom between the left half housing and the right half housing, characterized in that, The connecting mechanism further comprises: a first plug (3) arranged in the left half of the handle and a first lock (4) arranged in the right half of the handle, the first lock (4) being matched with the first plug (3) and used to fix the left half of the handle and the right half of the handle; a second plug (5) arranged in the left half of the gun body and a second lock (6) arranged in the right half of the gun body, the second lock (6) being matched with the second plug (5) and used to fix the left half of the gun body and the right half of the gun body; a linkage (7) arranged between the first lock (4) and the second lock (6), the linkage (7) being used to synchronize the locking or releasing actions of the first lock (4) and the second lock (6).

2. The scan gun housing connection mechanism of claim 1, wherein, The first plug (3) comprises two vertical supporting rods (31) fixed in the left half of the handle and at least one vertical plug (32) arranged on the vertical supporting rods (31) in the vertical direction, and a vertical plug hole (33) being communicated between the top and the bottom of the vertical plug (32).

3. The scan gun housing connection mechanism of claim 2, wherein, One of the vertical faces of the vertical supporting rods (31) is flush with the vertical face of the left half of the handle facing the right half of the handle, and the vertical plug (32) is located on the vertical face of the vertical supporting rods (31) facing the right half of the handle.

4. The scan gun housing connection mechanism of claim 2, wherein, The first lock (4) comprises two vertical rods (41) arranged in the right half of the handle and at least one vertical plug slot (42) arranged on the vertical rods (41), the vertical plug slot (42) being matched with the vertical plug (32), and outer through grooves (43) being arranged on the opposite faces of the two vertical rods (41), the bottom inside the outer through grooves (43) being communicated with the top inside the vertical plug slot (42), and a connecting rod (44) being arranged between the two outer through grooves (43), the two ends of the bottom of the connecting rod (44) being provided with vertical plug rods (45), and the vertical plug rods (45) being matched with the vertical plug hole (33).

5. The scan gun housing connection mechanism of claim 4, wherein, One of the vertical faces of the vertical rods (41) is flush with the vertical face of the right half of the handle facing the left half of the handle, and the opening of the vertical plug slot (42) is located on the vertical face of the vertical rods (41) facing the left half of the handle.

6. The scan gun housing connection mechanism of claim 2, wherein, The second plug (5) comprises a horizontal supporting rod (51) fixed to the top of the left half of the gun body and at least one horizontal plug (52) fixed to the horizontal supporting rod (51), a horizontal plug hole (53) being arranged on the horizontal plug (52) in the axial direction of the horizontal supporting rod (51), the horizontal supporting rod (51) being parallel to the right half of the gun body, one of the vertical faces of the horizontal supporting rod (51) being flush with the vertical face of the left half of the gun body facing the right half of the gun body, and the horizontal plug (52) being located on the vertical face of the horizontal supporting rod (51) facing the right half of the gun body.

7. The scan gun housing connection mechanism of claim 6, wherein, The second lock (6) comprises at least two guide blocks (61) arranged side by side on the top of the right half of the gun body and a limiting frame (65) fixed to the top of the right half of the gun body, a horizontal plug rod (62) being inserted through the guide blocks (61), the horizontal plug rod (62) being matched with the horizontal plug hole (53), one end of the horizontal plug rod (62) being fixedly provided with a horizontal connecting rod (63), one end of the horizontal connecting rod (63) being fixedly provided with a horizontal sliding bar (64), and the horizontal sliding bar (64) being located between the limiting frame (65) and the guide blocks (61) inside the limiting frame (65).

8. The scan gun housing connection mechanism of claim 7, wherein, The axis of the crosswise connecting rod (62) and the axis of the crosswise slide bar (64) are coplanar and parallel, and the axis of the crosswise connecting rod (62) is coplanar with the axis of the crosswise connecting rod (63) and perpendicular to the axis of the crosswise connecting rod (63).

9. The scan gun housing connection mechanism of claim 7, wherein, The linkage (7) comprises a through hole (71) arranged at the bottom of the right half handle and an internal through groove (72) communicating between the right half handle and the interior of the right half gun body, a guide rod (73) being inserted between the internal through groove (72) and the through hole (71), the guide rod (73) being fixed at the exterior of the connecting rod (44), the top end of the guide rod (73) being hingedly connected with two connecting arms (75), one end of each of the two connecting arms (75) being hingedly connected with the opposite end of the crosswise slide bar (64), a compression spring (74) being slidably sleeved at the exterior of the guide rod (73), and the two ends of the compression spring (74) being fixed at the exterior of the guide rod (73) and the top of the interior of the right half handle respectively.

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