A bench drill guard

Abstract

This utility model discloses a protective device for a bench drill, comprising: a drill bit, a chuck connected to the top of the drill bit, a first shaft fixed to the top of the chuck, a second shaft connected above the first shaft, and the second shaft connected to the first shaft via a protective unit. Through the cooperation of the drill bit, chuck, first shaft, second shaft, and protective unit, the oblique clamping force between the inclined hole and the bottom slope of the chuck increases continuously. As the force increases, the chuck moves upwards and into the vertical hole until it is removed from the inclined hole. At this point, the second disc and the drill bit lose the kinetic energy required for transmission, preventing excessive torque accumulation at both ends of the drill bit, reducing the probability of drill bit breakage and splashing, providing a certain degree of protection for the operator, and preventing a significant increase in the resistance to drill bit rotation, thus avoiding temporary burden on the driving components and facilitating the long-term stable operation of the bench drill.

Description

Technical Field

[0001] This utility model relates to the field of bench drill protection technology, and in particular to a bench drill protection device. Background Technology

[0002] A bench drill is a small drilling machine mainly used for drilling, reaming, tapping, and surface finishing of small to medium-sized parts. Bench drills are typically mounted on a specially designed workbench and are characterized by their ease of operation and maintenance.

[0003] To ensure the safety of bench drills during operation, they are equipped with safety protection devices such as protective covers, emergency stop buttons, overload protection devices, and steel plate protective covers. These devices can improve the safety of bench drills during operation.

[0004] However, some safety hazards may still exist during use by operators who are not skilled or experienced. For example, excessive force when drilling with a bench drill can cause the drill bit to overheat or even break, which is not conducive to the operator's safety. In addition, the significant increase in drill bit resistance will temporarily increase the burden on the drive mechanism, which is not conducive to the long-term stable operation of the bench drill. Therefore, it is necessary to provide a bench drill protection device to solve the above technical problems. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the existing technology, this utility model provides a bench drill protection device that can prevent the drill bit from breaking and splashing, injuring the operator during operation, and will not cause a significant increase in drill bit resistance, which is conducive to the long-term stable operation of the bench drill.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A protective device for a bench drill includes: a drill bit, a chuck connected to the top of the drill bit, a first shaft fixedly connected to the top of the chuck, a second shaft connected above the first shaft, and the second shaft connected to the first shaft via a protective unit. The protective unit includes: a first disc fixedly attached to the bottom end of the second shaft; a second disc fitted to the lower surface of the first disc, with the center of the lower surface of the second disc fixedly connected to the top of the first shaft; a T-shaped annular groove annularly formed at the center of the outer wall of the second disc; two T-shaped sliders respectively slidably connected to the inner sides of the T-shaped annular groove; and a vertical plate tightly fitted to the T-shaped slider. The outer end of the block; a first bolt, inserted below the front surface of the vertical plate, and threaded through the vertical plate to the T-shaped slider; a second bolt, inserted above the front surface of the vertical plate, and threaded through the vertical plate to the first disc; multiple oblique holes, arranged in a ring at equal intervals on the outer side of the upper surface of the second disc; a locking rod, unidirectionally engaged inside the oblique holes; a vertical rod, located above the locking rod, located on the lower surface of the first disc, with a clearance fit between the outer wall of the vertical rod and the outer wall of the locking rod; a gasket, located above the locking rod, and connected to the first disc; and a compression spring, vertically located between the gasket and the locking rod.

[0008] Preferably, the second disk has a double-layer structure, and the two layers can be connected by a fifth bolt.

[0009] Preferably, the two T-shaped sliders are arranged symmetrically with respect to the center of the second disk.

[0010] Preferably, the gasket is connected to the first disk via an adjustment unit, the adjustment unit comprising: a plurality of grooves, which are equidistantly spaced on the outer side of the upper surface of the first disk in a ring; a third bolt located vertically at the center of the grooves and threadedly connected to the contact surface of the first disk; a fourth bolt located at the center of the lower surface of the gasket and threadedly connected to the third bolt through the gasket; and a through hole located vertically at the center of the upper surface of the lever, which can be penetrated by the fourth bolt.

[0011] Preferably, the centers of the third bolt, washer, compression spring, and locking rod are all located on the same horizontal and vertical line.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) This utility model uses the cooperation between the drill bit, chuck, first shaft, second shaft and protective unit. The user first connects the top of the second shaft to the output end of the external bench drill. The bench drill can be started so that the drill bit can rotate normally to perform small parts drilling, reaming, boring, tapping and scraping. If the driving force applied to the drill bit is too large due to improper operation or lack of experience, the torque between the second shaft and the first shaft will increase. The oblique clamping force between the inclined hole and the bottom slope of the chuck will continue to increase. As the force increases, the chuck will move upward into the inside of the upright until it is removed from the inside of the oblique hole. At this time, the second disc and the drill bit lose the kinetic energy required for transmission. This can avoid excessive torque accumulation at the top and bottom ends of the drill bit, reduce the probability of the drill bit breaking and splashing, and provide a certain protective effect for the operator. The resistance of the drill bit rotation will not increase significantly, and the burden on the driving components will not be temporarily increased. This is conducive to the long-term stable operation of the bench drill.

[0014] (2) Through the cooperation between the drill bit, chuck, first shaft, second shaft, protective unit and adjustment unit, the user can rotate the third bolt to adjust the distance between the shim and the chuck, thereby adjusting the compression force of the spring on the chuck, and realizing the maximum force when the chuck is removed from the inclined hole, so as to control the maximum output torque of the drill bit, so as to be suitable for use with drill bits of different thicknesses (strengths);

[0015] (3) The present invention utilizes the cooperation between the second disc, the T-shaped annular groove, the T-shaped slider and the fifth bolt. The second disc has a double-layer structure and can be connected by the fifth bolt, so that the T-shaped slider can be set inside the T-shaped annular groove, so as to facilitate the smooth production and manufacturing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 Top view of the second disk in the middle;

[0018] Figure 3 for Figure 1 A partial top sectional view of the first disk and the second shaft;

[0019] Figure 4 for Figure 1 Front sectional view of the first and second disks in the middle;

[0020] Figure 5 for Figure 1 Side sectional view of the first and second disks in the middle;

[0021] Figure 6 for Figure 4 Enlarged view of point A in the middle;

[0022] Figure 7 for Figure 6 Side sectional view of the overall structure of the middle clamp rod.

[0023] The corresponding names of the attached figures are as follows: 1-Drill bit, 2-Chuck, 3-First shaft, 4-Second shaft, 5-First disc, 6-Second disc, 7-T-shaped annular groove, 8-T-shaped slider, 9-Vertical plate, 10-First bolt, 11-Second bolt, 12-Angled hole, 13-Clamping rod, 14-Upright rod, 15-Washer, 16-Compression spring, 17-Groove, 18-Third bolt, 19-Fourth bolt, 20-Through hole, 21-Fifth bolt. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0025] like Figure 1-7As shown, this utility model provides a protective device for a bench drill, comprising: a drill bit 1, with a chuck 2 connected to the top of the drill bit 1. The chuck 2 is a bench drill chuck, one of the core components of the bench drill, mainly used to hold the drill bit 1 and ensure the drill remains stable during drilling. The bench drill chuck typically consists of a drill sleeve, a tensioning ring, a connecting block, and a rear cover. It clamps the drill bit 1 by circumferentially moving the insertion hole and threaded connection. A first shaft 3 is fixedly connected to the top of the chuck 2, and a second shaft 4 is connected above the first shaft 3. The second shaft 4 can be used... The second shaft 4 is connected to the output end of an external bench drill. It is connected to the first shaft 3 via a protective unit, which includes: a first disc 5 fixed to the bottom end of the second shaft 4; a second disc 6 fitted to the lower surface of the first disc 5, with the center of the lower surface of the second disc 6 fixedly connected to the top end of the first shaft 3; a T-shaped annular groove 7, annularly formed at the center of the outer wall of the second disc 6; and two T-shaped sliders 8, respectively limited and slidably connected to the inner sides of the T-shaped annular groove 7, allowing the T-shaped sliders 8 to move within the T-shaped annular groove. The circle slides, but cannot be separated from the T-shaped groove 7; the vertical plate 9 is tightly fitted to the outer end of the T-shaped slider 8; the first bolt 10 is inserted below the front surface of the vertical plate 9, and the first bolt 10 passes through the vertical plate 9 and is threadedly connected to the T-shaped slider 8; the second bolt 11 is inserted above the front surface of the vertical plate 9, and the second bolt 11 passes through the vertical plate 9 and is threadedly connected to the first disc 5; multiple oblique holes 12 are provided, and are equidistantly arranged in a ring on the outer side of the upper surface of the second disc 6; the locking rod 13 is unidirectionally locked inside the oblique hole 12; the upright rod 14 is located at... Above the locking rod 13, the upright rod 14 is opened on the lower surface of the first disc 5. The outer wall of the upright rod 14 is in clearance fit with the outer wall of the locking rod 13. Clearance fit refers to a fit with a gap (including a minimum gap equal to zero). The shim 15 is located above the locking rod 13 and is connected to the first disc 5. The compression spring 16 is vertically located between the shim 15 and the locking rod 13. The elastic coefficient of the compression spring 16 is 1-5 N / CM. The top end of the compression spring 16 is in contact with the lower surface of the shim 15, and the bottom end of the compression spring 16 is fixedly connected to the contact surface of the locking rod 13.

[0026] Example 2: The second disc 6 has a double-layer structure, and the two layers can be connected by the fifth bolt 21 so that a T-shaped slider 8 can be set inside the T-shaped annular groove 7 to facilitate the smooth production process.

[0027] Example 3: The two T-shaped sliders 8 are symmetrically arranged with respect to the center of the second disk 6, so that the two T-shaped sliders 8 can apply force to the second disk 6 evenly.

[0028] Example 4: The shim 15 is connected to the first disk 5 through an adjustment unit. The adjustment unit includes: a plurality of grooves 17, which are equidistantly arranged in a ring on the outer side of the upper surface of the first disk 5; a third bolt 18 located vertically at the center of the groove 17, and the third bolt 18 is threadedly connected to the contact surface of the first disk 5, with the bottom end of the third bolt 18 abutting against the shim 15; a fourth bolt 19 located at the center of the lower surface of the shim 15, and the fourth bolt 19 is threadedly connected to the third bolt 18 through the shim 15; and a through hole 20 located vertically at the center of the upper surface of the clamping rod 13, which can be penetrated by the fourth bolt 19. The user can rotate the third bolt 18 to adjust the distance between the shim 15 and the clamping rod 13, thereby adjusting the compression force of the spring 16 on the clamping rod 13. This allows for the maximum force when the clamping rod 13 is removed from the inclined hole 12, so as to control the maximum output torque of the drill bit 1 and adapt it to different diameter (strength) drill bits 1.

[0029] Example 5: The centers of the third bolt 18, washer 15, compression spring 16 and locking rod 13 are all located on the same horizontal and vertical line. After the third bolt 18 is rotated to adjust the height of the washer 15, it is convenient for the compression spring 16 to apply force evenly to the locking rod 13.

[0030] In use, the user first connects the top of the second shaft 4 to the output end of the external bench drill. Starting the bench drill allows the drill bit 1 to rotate normally, enabling it to perform drilling, reaming, tapping, and surface scraping of small parts. However, due to improper operation or inexperience, if the driving force applied to the drill bit 1 is too large, the torque between the second shaft 3 and the first shaft 3 increases. This causes the oblique clamping force between the inclined hole 12 and the bottom slope of the locking rod 13 to continuously increase. As the force increases, the locking rod 13 will move upwards and inwards towards the inside of the upright 14 until it is removed from the inclined hole 12. At this point, the second disc 6 and the drill bit 1 lose their transmission... The required kinetic energy can prevent excessive torque accumulation at the top and bottom of the drill bit 1, reducing the chance of the drill bit 1 breaking and splashing. It can also provide a certain degree of protection for the operator. The resistance to the rotation of the drill bit 1 will not increase significantly, and it will not temporarily increase the burden on the drive components, which is conducive to the long-term stable operation of the bench drill. If the drill bit 1 of different diameters is replaced during use, the user can rotate the third bolt 18 to adjust the distance between the shim 15 and the chuck 13, thereby adjusting the compression force of the spring 16 on the chuck 13. This can achieve the maximum force when the chuck 13 is removed from the inclined hole 12, so as to adapt to the maximum output torque of the drill bit 1.

[0031] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A protective device for a benchtop drilling machine, characterized in that, include: A drill bit (1) has a chuck (2) connected to its top end. A first shaft (3) is fixedly connected to the top end of the chuck (2). A second shaft (4) is connected above the first shaft (3). The second shaft (4) is connected to the first shaft (3) through a protective unit. The protective unit includes: The first disc (5) is fixed to the bottom end of the second shaft (4); The second disk (6) is attached to the lower surface of the first disk (5), and the center of the lower surface of the second disk (6) is fixedly connected to the top end of the first shaft (3); The T-shaped annular groove (7) is formed in a ring at the center of the outer wall of the second disk (6); Two T-shaped sliders (8) are provided, which are respectively limited and slidably connected to the two sides inside the T-shaped annular groove (7); The vertical plate (9) is tightly fitted to the outer end of the T-shaped slider (8); The first bolt (10) is inserted below the front surface of the vertical plate (9), and the first bolt (10) passes through the vertical plate (9) and is threadedly connected to the T-shaped slider (8); The second bolt (11) is inserted above the front surface of the vertical plate (9), and the second bolt (11) passes through the vertical plate (9) and is threadedly connected to the first disc (5); Multiple oblique holes (12) are provided and are arranged in a ring at equal intervals on the outer side of the upper surface of the second disk (6); The locking rod (13) is unidirectionally engaged inside the inclined hole (12); The upright (14) is located above the clamping rod (13). The upright (14) is opened on the lower surface of the first disc (5). The outer wall of the upright (14) is in clearance fit with the outer wall of the clamping rod (13). A gasket (15) is located above the lever (13) and is connected to the first disk (5); A compression spring (16) is vertically positioned between the pad (15) and the lever (13).

2. The bench drill protection device according to claim 1, characterized in that, The second disk (6) has a double-layer structure, and the two layers can be connected by the fifth bolt (21).

3. The bench drill protection device according to claim 1, characterized in that, The two T-shaped sliders (8) are arranged symmetrically with respect to the center of the second disk (6).

4. A protective device for a bench drill press according to claim 1, characterized in that, The gasket (15) is connected to the first disk (5) via an adjustment unit, the adjustment unit comprising: Multiple grooves (17) are provided and are arranged in a ring at equal intervals on the outer side of the upper surface of the first disk (5); The third bolt (18) is vertically located at the inner center of the groove (17), and the third bolt (18) is threadedly connected to the contact surface of the first disk (5); The fourth bolt (19) is located at the center of the lower surface of the washer (15), and the fourth bolt (19) passes through the washer (15) and is threadedly connected to the third bolt (18); A through hole (20) is vertically opened at the center of the upper surface of the clamp (13), and the through hole (20) can be penetrated by the fourth bolt (19).

5. A protective device for a bench drill press according to claim 4, characterized in that, The centers of the third bolt (18), washer (15), compression spring (16) and clamp (13) are all located on the same horizontal vertical line.

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