JP7776728B2 - Work equipment - Google Patents

Description

The present invention relates to a nail driver equipped with a housing capable of supporting a striking part and a handle.

One known example of a nail gun (working machine) is a nail gun equipped with a housing capable of supporting a striking part that strikes fasteners, and a handle that is gripped by the operator. Furthermore, Patent Document 1 describes an example of such a nail gun in which the housing has a cylindrical main body, a handle connected to the cylindrical main body, and a motor case connected to the cylindrical main body.

Japanese Patent Application Laid-Open No. 2021-3777

In the nail gun configuration described in Patent Document 1, the vibrations of the striking part are applied to the cylindrical main body, and the impact on the cylindrical main body is then transmitted directly to the handle, resulting in poor operability. To address this issue, it was conceivable to connect the cylindrical main body, which can support the striking part, to the handle via an elastic body, but a structure in which the elastic body is sandwiched in the striking direction does not adequately absorb the impact. There was also a risk that the reliability of the nail gun would be compromised.

The object of the present invention is to provide a work machine with improved reliability and workability.

a connecting surface facing the front-rear direction, a step portion that protrudes from the connecting surface in the front-rear direction and fits so that its peripheral surface abuts against the inner peripheral surface of a recess formed in the first part; and a fitting portion that is positioned within the area of the step portion when viewed in the front-rear direction, protrudes forward from the step portion, and fits so that its peripheral surface abuts against the inner peripheral surface of the recess formed in the first part. The step portion and the fitting portion shear deform when the second part moves in the front-rear direction relative to the first part.
Another embodiment of the work machine is a work machine having a housing and a striking section that moves in an up-and-down direction to strike a fastener, the housing comprising a first section that supports the striking section and a second section that has a handle section that extends in a front-to-rear direction, the second section being movable in the up-and-down direction relative to the first section, an elastic body that fits into the first section and the second section being disposed between the first section and the second section in the front-to-rear direction, the elastic body undergoing shear deformation when the second section moves in the up-and-down direction relative to the first section, the first section including a right-side first member and a left-side first member assembled to the right-side first member, the second section including a right-side second member and a left-side second member assembled to the right-side second member, the elastic body including a right-side elastic body and a left-side elastic body assembled to the right-side elastic body.

This invention can improve the reliability and workability of work equipment.

1 is an explanatory diagram showing the internal structure of a nail driver (working machine) according to an embodiment of the present invention; FIG. 2 is an explanatory diagram showing a structure in which a fastener is loaded in the nailing machine shown in FIG. 1 . 2A and 2B are diagrams showing the structure of an elastic body provided in the nail driver shown in FIG. 1, in which FIG. 2A is a perspective view seen from the rear, and FIG. 2B is a perspective view seen from the front. 4A and 4B are perspective views showing the structure of the mating surface that is mated with the elastic body shown in FIG. 3, where FIG. 4A is a view of the mating surface of the handle as seen from the front, and FIG. 4B is a view of the mating surface of the main body housing as seen from the rear. 2 is a partially enlarged view showing the structure of a fitting portion of an elastic body in the nail driver shown in FIG. 1 . FIG. FIG. 6 is a partial cross-sectional view showing the structure cut along line AA shown in FIG. 5. 6A is a partial cross-sectional view showing the structure cut along line BB shown in FIG. 5, and FIG. 6B is a partial cross-sectional view showing the structure cut along line CC shown in FIG. 5. 6A is a partial cross-sectional view showing the structure cut along line DD shown in FIG. 5, and FIG. 6B is a partial cross-sectional view showing the structure cut along line EE shown in FIG. 5. FIG. 10 is an explanatory diagram showing the internal structure of a nail driver according to a first modified example of the present invention. FIG. 10 is an explanatory diagram showing the internal structure of a nail driver according to a second modified example of the present invention. 11 is a partial cross-sectional view showing the structure cut along line FF shown in FIG. 10.

The nail gun of this embodiment will be described with reference to the drawings.

The nailing machine (working machine) 1 of this embodiment shown in Figure 1 is suitable for driving fasteners 6 (see Figure 2), such as nails or staples, into mating materials such as boards or gypsum boards.

The nail gun 1 has a housing 10 and a magazine unit 20. The housing 10 includes a main housing (first part) 11, a handle (second part) 12, a motor housing (third part) 13, and a connecting part 14. The motor housing 13 is also called a motor case. One longitudinal end of the handle 12 and the motor housing 13 is connected to the main housing 11, and the other longitudinal end of the handle 12 and the motor housing 13 is connected to the connecting part 14. In other words, the main housing 11, handle 12, motor housing 13, and connecting part 14 are integrated. The housing 10 is made of a synthetic resin such as nylon or polycarbonate. Therefore, the main housing 11, handle 12, motor housing 13, and connecting part 14 that make up the housing 10 are integrally formed by resin molding. The main housing 11 has an approximately rectangular cylindrical shape overall.

Here, the longitudinal direction of the main body housing 11 shown in Figure 1 is defined as the "up-down direction C1," and the longitudinal direction of the handle 12 and motor housing 13 is defined as the "front-rear direction B1." Furthermore, the direction perpendicular to the up-down direction C1 and the front-rear direction B1 is defined as the "left-right direction E1" shown in Figure 3. However, these definitions are merely for the convenience of explanation.

According to the above definition, the handle 12 is located above the motor housing 13 and extends rearward from one side (rear side/back surface) of the main body housing 11. In other words, the handle 12 has a handle portion 12m extending in the fore-and-aft direction B1. Meanwhile, the motor housing 13 is located below the handle 12 and extends rearward from one side (rear side/back surface) of the main body housing 11. Furthermore, the connecting portion 14 connects the rear portion 12k of the handle 12 and the rear portion 13d of the motor housing 13. In other words, the fore-and-aft direction in this embodiment corresponds to the extension direction of the handle 12 in the present invention.

The nail gun 1 also includes a striking unit 30. The striking unit 30 is supported by the main housing 11 and includes a plunger 31 disposed within the main housing 11 and a driver blade 32 fixed to the plunger 31. The driver blade 32 is made of metal. A guide shaft 33 is fixed within the main housing 11. A center line A1 is the center of the guide shaft 33. The plunger 31 is attached to the guide shaft 33, and the striking unit 30 is movable in a direction along the center line A1.

The ejection section 7 is attached to the main housing 11 so as to be exposed to the outside of the main housing 11. The ejection section 7 can be defined as a nose section. The striking section 30 moves in the vertical direction C1 and strikes the fastener 6 sent to the ejection section 7. The ejection section 7 has a blade guide 5 and a guide plate 38. The blade guide 5 may be made of either metal or synthetic resin. The ejection section 7 has an ejection path 2 formed by the blade guide 5. The ejection path 2 may be a groove, passage, hole, gap, or space. The driver blade 32 is movable within the ejection path 2.

A push lever 8 is attached near the tip of the ejector 7. The push lever 8 can move and stop relative to the ejector 7. The push lever 8 can also come into contact with and separate from the mating material. By contacting the driver blade 32, the ejector 7 prevents the driver blade 32 from moving in a direction that intersects with the center line A1.

The weight 34 also suppresses the recoil that the housing 10 receives. The weight 34 is made of metal, for example. The weight 34 is attached to the guide shaft 33 and is movable in a direction along the center line A1.

A metal spring 35 is disposed within the main housing 11, between the plunger 31 and the weight 34 in the direction along the center line A1. The plunger 31 receives a downward biasing force D1 from the spring 35, which moves the plunger 31 toward the injection unit 7 in the direction along the center line A1. The weight 34 receives an upward biasing force D2 from the spring 35, which moves the weight 34 away from the injection unit 7 in the direction along the center line A1. A weight bumper 36 and a plunger bumper 37 are also provided within the main housing 11. The weight bumper 36 and the plunger bumper 37 are both made of synthetic rubber.

The battery pack 19, which serves as the power source, is attached to and detached from the connecting portion 14. When voltage is applied from the battery pack 19 to the electric motor 16, causing the motor shaft 17 to rotate forward, the rotational force of the motor shaft 17 is transmitted to the first gear 42. The rotational force of the first gear 42 is then transmitted to the third gear 44 via the second gear 43.

The connecting portion 14 also includes a control unit 15. The control unit 15 is a microcomputer having an input port, an output port, an arithmetic processing unit, and a memory unit. The handle 12 also includes a trigger 4 and a trigger switch 41. When the operator applies an operating force to the trigger 4, the trigger switch 41 turns on. When the operator releases the operating force applied to the trigger 4, the trigger switch 41 turns off.

Furthermore, a holder section 24 and a magazine section 20 are provided on the opposite side of the motor housing section 13 from the handle 12. The magazine section 20 has a plate-shaped base member 20a that can store multiple fasteners 6 (see Figure 2) to be struck by the striking section 30. The magazine section 20 also has a feeder section 20b that supplies the multiple fasteners 6 stored therein one by one to the injection path 2. The fasteners 6 sent by the feeder section 20b to the injection path 2 of the injection section 7 are struck by the striking section 30, which moves downward D1 as shown in Figure 1. The fasteners 6 are then ejected from the injection port 3, which is the exit of the injection path 2, and driven into the mating material. More specifically, the heads of the fasteners 6 sent from the base member 20a of the magazine section 20 to the injection path 2 by the feeder section 20b are struck by the driver blade 32, which moves downward D1.

The nail gun 1 also has a detection unit 21 that detects the position of the feeder unit 20b in the front-to-rear direction B1. Furthermore, the magazine unit 20 has a handle arm 27 that is positioned on the other side of the holder unit 24 in the front-to-rear direction B1 (the rear side away from the ejection unit 7). The handle arm 27 is attached to the housing 10 and the base member 20a.

When the operator applies operating force to the trigger 4, the trigger switch 41 turns on, and when the push lever 8 is pressed against the opposing material, the push lever switch 9 turns on. The control unit 15 then applies voltage to the electric motor 16, rotating the motor shaft 17. The rotational force of the motor shaft 17 is amplified by the reducer 18 and transmitted to the first gear 42, causing the first gear 42, second gear 43, and third gear 44 to rotate. The striking unit 30 then rises from its standby position due to engagement of at least one of the cam rollers of the first gear 42 and the cam rollers of the second gear 43. Furthermore, the weight 34 descends due to engagement of the cam roller of the third gear 44.

Next, when the cam rollers of the first gear 42 and the second gear 43 are both released from engagement, the striking section 30 descends due to the biasing force of the spring 35. Furthermore, when the cam roller of the third gear 44 is released from engagement, the weight 34 ascends due to the biasing force of the spring 35. The driver blade 32 strikes a stopper 6 that has reached the injection path 2 from the base member 20a of the magazine section 20, and the stopper 6 is driven into the opposing material.

After the driver blade 32 strikes the fastener 6, the plunger 31 collides with the plunger bumper 37. The plunger bumper 37 absorbs some of the kinetic energy of the striking portion 30. The weight 34 also collides with the weight bumper 36. The weight bumper 36 absorbs some of the kinetic energy of the weight 34. In this way, when the striking portion 30 moves downward D1 to strike the fastener 6, the weight 34 can reduce the recoil when the striking portion 30 strikes the fastener 6.

The control unit 15 also keeps the electric motor 16 rotating after the fastener 6 is driven into the mating material, the operator releases the push lever 8 from the mating material, and the trigger switch 41 is turned off. The striking unit 30 then rises from the bottom dead center against the biasing force of the spring 35, and the plunger 31 separates from the plunger bumper 37. When the control unit 15 detects that the striking unit 30 has reached the standby position, it stops the electric motor 16.

Next, the connection structure between the main body housing 11 and the handle 12 in the nail gun 1 will be described. In the nail gun 1, the handle 12 is movable relative to the main body housing 11 in the up-down direction C1. Specifically, the front portion 12h of the handle 12 and the upper portion 11j of the main body housing 11 are not directly connected. Here, the structure of the housing 10 will be described in detail. The main body housing 11, which constitutes the housing 10, is shaped to extend in the up-down direction C1. The handle 12 is shaped to extend in the front-to-back direction B1. A motor accommodating section 13, which also extends in the front-to-back direction B1, is located below the handle 12. Note that in the nail gun 1, the upper portion 11j of the main body housing 11 is located near the location of the third gear 44 in the main body housing 11, while the lower portion 11p of the main body housing 11 is located near the location of the first gear 42 in the main body housing 11. Furthermore, the front portion 12h of the handle 12 is the portion of the handle 12 near where the trigger 4 is located, while the rear portion 12k of the handle 12 is the portion of the handle 12 near where part of the control unit 15 is located. Furthermore, the front portion 13c of the motor housing 13 is the portion of the motor housing 13 near where part of the reducer 18 is located, while the rear portion 13d of the motor housing 13 is the portion of the motor housing 13 near where part of the electric motor 16 is located.

The motor housing 13 has a front portion 13c that connects to the lower portion 11p of the main body housing 11, and a rear portion 13d that bends upward and connects to the rear portion 12k of the handle 12 via the connecting portion 14. In other words, the housing 10 is shaped so that the main body housing 11 is connected to the motor housing 13, and the motor housing 13 is further connected to the handle 12 via the connecting portion 14. Therefore, the main body housing 11, motor housing 13, connecting portion 14, and handle 12 are integrated. However, as mentioned above, the front portion 12h of the handle 12 and the upper portion 11j of the main body housing 11 are not directly connected. With this structure, the main body housing 11 moves relative to the handle 12 in the vertical direction C1 due to vibrations caused by driving the nail gun 1.

Therefore, in the nail gun 1 of this embodiment, the front portion 12h of the handle 12 is connected to the upper portion 11j of the main body housing 11 via the elastic body 50. That is, in the nail gun 1, the elastic body 50 is disposed between the main body housing 11 and the handle 12 in the front-to-rear direction B1. In other words, the elastic body 50 is sandwiched between the main body housing 11 and the handle 12 in the front-to-rear direction B1, and the main body housing 11 and the handle 12 are connected in the front-to-rear direction B1 via the elastic body 50. As a result, in the nail gun 1, the elastic body 50 undergoes shear deformation when the handle 12 moves relative to the main body housing 11 in the up-to-down direction C1. Specifically, when the main body housing 11 vibrates in the up-to-down direction C1 due to hammering, the elastic body 50 is not crushed in the sandwiched direction (the front-to-rear direction B1) but rather exerts elastic force against the force applied in the shear direction. Therefore, the elastic body 50 is shaped so that the front portion of the elastic body 50 fits into the main body housing 11, and the rear portion of the elastic body 50 fits into the handle 12. The elastic body 50 is, for example, a plate-shaped member made of rubber.

The nail gun 1 has a switch 22 located on the upper portion 11j of the main housing 11. The switch 22 is a detector that detects the position of the weight 34, and a wiring 23 is electrically connected to the switch 22. The wiring 23 is electrically connected to a wiring board included in the control unit 15 located on the rear portion 12k of the handle 12. In other words, the nail gun 1 has the wiring 23 extending from inside the main housing 11 to inside the handle 12. If the front portion 12h of the handle 12 and the upper portion 11j of the main housing 11 were not connected, the wiring 23 would not be able to pass through. Therefore, in the nail gun 1 of this embodiment, an elastic body 50 is interposed between the front portion 12h of the handle 12 and the upper portion 11j of the main housing 11, and the wiring 23 is inserted through a through-hole 50j (see Figure 3) provided in the elastic body 50, allowing the wiring 23 to be routed from inside the main housing 11 to inside the handle 12.

Next, the shape of the elastic body 50, the mating structure between the elastic body 50 and the main body housing 11, and the mating structure between the elastic body 50 and the handle 12 will be described using Figures 3 and 4. The elastic body 50 is a plate-like structure elongated in the vertical direction C1. As shown in Figure 3(a), the connecting surface of the elastic body 50 with the handle 12 is provided with a recessed step portion 50q recessed from the connecting surface. This recessed step portion 50q is provided with, from top to bottom, a through-hole 50j through which the wiring 23 can be inserted, a groove portion 50r extending in the horizontal direction E1, a protrusion (fitting portion) 50h, and an elongated through-hole 50k for material escape. Meanwhile, as shown in Figure 3(b), the connecting surface of the elastic body 50 with the main body housing 11 is provided with a protruding step portion 50p, a protruding step portion 50n, and a protruding step portion 50m. The protruding step portion 50p is provided with a protruding portion (fitting portion) 50e, and the protruding step portion 50m is provided with a through-hole 50j, a protruding portion (fitting portion) 50f, a through-hole 50k, and a protruding portion (fitting portion) 50g.

Also, as shown in FIG. 4(a), the connection surface of the handle 12 with the elastic body 50 is provided with a protruding step 12i that fits into the recessed step 50q of the elastic body 50, and this protruding step 12i is provided with a through-hole 12g, a protrusion 12j, and a recess (fitting portion) 12e. Wiring 23 is inserted through the through-hole 12g. Furthermore, the protrusion 12j fits into the groove 50r of the elastic body 50, and the recess 12e fits into the protrusion 50h of the elastic body 50. Furthermore, the protruding step 12p of the handle 12 fits into the step 50s of the elastic body 50. The protrusion 12j of the handle 12 fits into the groove 50r of the elastic body 50, the recess 12e of the handle 12 fits into the protrusion 50h of the elastic body 50, and further the protruding step 12p of the handle 12 fits into the step 50s of the elastic body 50, thereby positioning the handle 12 and the elastic body 50 and preventing misalignment of the handle 12 and the elastic body 50 and detachment of the elastic body 50.

On the other hand, as shown in Figure 4(b), the connection surface of the main housing 11 with the elastic body 50 is provided with a recess (fitting portion) 11e, a through hole 11i, a recess (fitting portion) 11f, and a recess (fitting portion) 11g. Wiring 23 is inserted through the through hole 11i. Furthermore, recess 11e fits with protrusion 50e of the elastic body 50, recess 11f fits with protrusion 50f of the elastic body 50, and recess 11g fits with protrusion 50g of the elastic body 50. Furthermore, recessed step portion 11k of main body housing 11 fits with protruding step portion 50m of elastic body 50, recessed step portion 11m of main body housing 11 fits with protruding step portion 50n of elastic body 50, and further, recessed step portion 11n of main body housing 11 fits with protruding step portion 50p of elastic body 50. In other words, recessed portion 11e, recessed portion 11f, and recessed portion 11g of main body housing 11 fit with protruding portion 50e, protruding portion 50f, and protruding portion 50g of elastic body 50, respectively, and further, recessed step portion 11k, recessed step portion 11m, and recessed step portion 11n of main body housing 11 fit with protruding step portion 50m, protruding step portion 50n, and protruding step portion 50p of elastic body 50, respectively. This allows the main body housing 11 and the elastic body 50 to be positioned, and prevents misalignment of the main body housing 11 and the elastic body 50, as well as the elastic body 50 falling off.

Next, the division structure of the main body housing 11, handle 12, and elastic body 50 will be described. The main body housing 11, handle 12, motor accommodating section 13, connecting section 14, and elastic body 50 each have a two-part structure that can be divided in the left-right direction E1. Specifically, as shown in FIG. 4(b), the main body housing 11 includes a left main body housing (left-side first member) 11a and a right main body housing (right-side first member) 11b that is assembled to the left main body housing 11a. The left main body housing 11a and the right main body housing 11b can be divided along a division line 11h. Meanwhile, as shown in FIG. 4(a), the handle 12 includes a left handle (left-side second member) 12a and a right handle (right-side second member) 12b that is assembled to the left handle 12a. The left handle 12a and the right handle 12b can be divided along a division line 12f. The motor housing 13 includes a left motor housing 13a and a right motor housing (not shown) that is assembled to the left motor housing 13a. The left motor housing 13a and the right motor housing are separable along a parting line. The connecting portion 14 includes a left connecting portion 14a and a right connecting portion (not shown) that is assembled to the left connecting portion 14a. The left connecting portion 14a and the right connecting portion are separable along the parting line. The left main body housing 11a, the left handlebar 12a, the left motor housing 13a, and the left connecting portion 14a are an integral part. Similarly, the right main body housing 11b, the right handlebar 12b, the right motor housing, and the right connecting portion are an integral part. As shown in FIGS. 3(a) and 3(b), the elastic body 50 includes a left elastic body 50a and a right elastic body 50b that is assembled to the left elastic body 50a. The left elastic body 50a and the right elastic body 50b can be separated at a separation line 50i. The separation line 11h of the main body housing 11, the separation line 12f of the handle 12, the separation line of the motor housing 13, the separation line of the connecting portion 14, and the separation line 50i of the elastic body 50 are all located on the same plane.

The left elastic body 50a can be fitted with the left main body housing 11a when it is separated from the right main body housing 11b, and can be fitted with the left handle 12a when it is separated from the right handle 12b. Similarly, the right elastic body 50b can be fitted with the right main body housing 11b when it is separated from the left main body housing 11a, and can be fitted with the right handle 12b when it is separated from the left handle 12a. In other words, the left elastic body 50a can be fitted with both the left main body housing 11a and the left handle 12a in a split state. Similarly, the right elastic body 50b can be fitted with both the right main body housing 11b and the right handle 12b in a split state.

As shown in Figures 5 and 6 to 8, the left-side main body housing 11a has a left-side main body housing fitting portion (left-side first member fitting portion) 11c. The left-side elastic body 50a has a left-side elastic body first fitting portion 50c that fits with the left-side main body housing fitting portion 11c by sliding rightward in the left-right direction E1 from the outside of the left-side main body housing 11a toward the left-side main body housing fitting portion 11c. In other words, when fitting the left-side elastic body 50a between the left handle 12a and the left-side main body housing 11a, the left-side elastic body 50a is slid rightward in the left-right direction E1 from the outside of the left-side main body housing 11a to position it between the left handle 12a and the left-side main body housing 11a. This allows the left-side elastic body first fitting portion 50c of the left-side elastic body 50a to fit with the left-side main body housing fitting portion 11c of the left-side main body housing 11a.

The left-side main body housing 11a also has a left-side main body housing restricting portion (left-side first member restricting portion) 11d that restricts the left-side elastic body first fitting portion 50c of the left-side elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left-side main body housing fitting portion 11c. In other words, the left-side main body housing 11a has a left-side main body housing restricting portion 11d that restricts the left-side elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left-side main body housing 11a. In this case, in the left-side main body housing restricting portion 11d, the V-plane shown in FIG. 6 is parallel to the front-rear direction B1, and the angle θ between the V-plane and the W-plane is 0°<θ<90°. The left-side main body housing 11a has the left-side main body housing restricting portion 11d, which restricts the left-side elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left-side main body housing 11a. The left-side main body housing 11a has a left-side main body housing restricting portion 11d, which is also the case in the cross-sectional structures of Figures 7(a), (b), and 8(a). Furthermore, in the cross-sectional structure of Figure 8(b), the left-side main body housing 11a has a recessed step portion 11m instead of the left-side main body housing restricting portion 11d. The presence of this recessed step portion 11m prevents the left-side elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left-side main body housing 11a.

Next, the fitting structure of the left handle 12a will be described. As shown in Figures 5 and 6 to 8, the left handle 12a has a left handle fitting portion (left second member fitting portion) 12c. The left elastic body 50a has a left elastic body second fitting portion 50d that fits with the left handle fitting portion 12c by sliding rightward in the left-right direction E1 from the outside of the left handle 12a toward the left handle fitting portion 12c. In other words, when fitting the left elastic body 50a between the left handle 12a and the left main body housing 11a, the left elastic body 50a is slid rightward in the left-right direction E1 from the outside of the left handle 12a to position it between the left handle 12a and the left main body housing 11a. This allows the left elastic body second fitting portion 50d of the left elastic body 50a to fit with the left handle fitting portion 12c of the left handle 12a.

The left handle 12a also has a left handle restricting portion (left second member restricting portion) 12d that restricts the left elastic body second fitting portion 50d of the left elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left handle fitting portion 12c. In other words, the left handle 12a has a left handle restricting portion 12d that restricts the left elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left handle 12a. The left handle 12a having the left handle restricting portion 12d can prevent the left elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left handle 12a. The fact that the left handle 12a has the left handle restricting portion 12d is also true for the cross-sectional structure in Figure 8(a). Furthermore, in the cross-sectional structures of Figures 7(b) and 8(b), the left handle 12a has a convex step 12i or a protrusion 12j in place of the left handle restriction portion 12d, and the presence of this convex step 12i or protrusion 12j prevents the left elastic body 50a from sliding leftward in the left-right direction E1 and separating from the left handle 12a.

In addition, in the nail gun 1, the right-side main body housing 11b, right-side handle 12b, and right-side elastic body 50b have fitting portions that are approximately symmetrical in shape to the left-side main body housing 11a, left-side handle 12a, and left-side elastic body 50a. As a result, when the left-side elastic body 50a is fitted between the split left handle 12a and left-side main body housing 11a, even in the split state, it is possible to position the left-side elastic body 50a relative to the left handle 12a and left-side main body housing 11a and prevent the left-side elastic body 50a from shifting or falling off. Similarly, when the right-side elastic body 50b is fitted between the split right handle 12b and right-side main body housing 11b, it is possible to position the right-side elastic body 50b relative to the right handle 12b and right-side main body housing 11b and prevent the right-side elastic body 50b from shifting or falling off.

In the nail gun 1 of this embodiment, an elastic body 50 is interposed between the handle 12 and the main housing 11 in the front-to-rear direction B1, which is perpendicular to the striking direction (up-to-down direction C1). This causes shear deformation of the elastic body 50 when the handle 12 moves relative to the main housing 11 in the up-to-down direction C1 due to impact during driving. In other words, when the main housing 11 vibrates in the up-to-down direction C1 during driving, the elastic body 50 does not collapse in the clamping direction (front-to-rear direction B1) but instead exerts elastic force against the force acting in the shear direction. In other words, in the nail gun 1, the elastic body 50 can absorb the shear force (hereinafter referred to as shear stress) acting between the handle 12 and the main housing 11. The elastic body 50 is shaped so that its front portion fits with the main housing 11 and its rear portion fits with the handle 12. This prevents the elastic body 50 from separating from the handle 12 and the main body housing 11 even when subjected to shear stress. Furthermore, because the elastic body 50 is interposed between the handle 12 and the main body housing 11 in the front-to-rear direction B1, it is possible to cut off vibrations generated on the main body housing 11 side and prevent them from propagating to the handle 12 side. As a result, the operability of the nail gun 1 can be improved. Furthermore, because the elastic body 50 can absorb shear stress generated between the main body housing 11 and the handle 12, the reliability of the nail gun 1 can be improved.

Furthermore, with the nail gun 1, the halved elastic body 50 can be fitted into the halved main body housing 11 and handle 12. Furthermore, the halved elastic body 50 is positioned relative to the halved main body housing 11 and handle 12 by multiple fittings and protrusions, and measures are taken to prevent the elastic body 50 from coming loose. Therefore, when assembling the left and right sides of the halved main body housing 11 and handle 12, the left elastic body 50a or right elastic body 50b can be attached to the left and right main body housing 11 and handle 12, respectively, before assembling the left and right main body housing 11 and handle 12. In other words, the assembly of the left and right sides of the main body housing 11 and handle 12 can be performed without increasing the number of steps.

Let us consider a comparative example in which the nail gun 1 does not include the elastic body 50. In this comparative example, a gap exists between the main body housing 11 and the handle 12, exposing the wiring 23 from the gap. This raises the risk of the wiring 23 getting caught on the mating material and being severed, which is undesirable from the standpoint of durability. To solve this problem, it is possible to connect the wiring 23 from the main body housing 11 to the control unit 15 via the motor housing 13 and the connecting portion 14, rather than directly from the main body housing 11 to the handle 12. However, this configuration requires providing space for the wiring 23 to pass around the periphery of the electric motor 16 in the motor housing 13. This increases the size of the motor housing 13 and, therefore, the overall size of the nail gun 1, which is undesirable. In contrast, the nail gun 1 of this embodiment is configured with the elastic body 50 and the wiring 23 passing through the through-hole 50j. This allows the wiring 23 to be routed from the main body housing 11 to the handle 12 without being exposed, thereby improving durability and achieving a more compact design.

Next, we will explain modified nail guns 1. In the nail gun 1 of the first modified example shown in Figure 9, the handle 12 and the battery mounting portion 58 are separated from each other within the housing 10. The handle 12 and the battery mounting portion 58 are fitted together using a Neidhardt spring (rotatable vibration-proof support) structure. Specifically, a rectangular inner metal portion 55 on the battery mounting portion 58 side is disposed inside a frame-shaped outer metal portion 56 on the handle 12 side. Four columnar elastic bodies 57 are disposed between the outer metal portion 56 and the inner metal portion 55, and the outer metal portion 56 and the inner metal portion 55 are fitted together via the four columnar elastic bodies 57. The elastic bodies 57 are made of, for example, rubber. The handle 12 and the main housing 11 are connected via an elastic body 50. Therefore, in the nail gun 1 of the first modified example, the handle 12 is supported at its front and rear by rubber. This reduces vibrations acting on the handle 12, further improving the operability of the nail gun 1.

In addition, in the nail gun 1 of the second modified example shown in FIG. 10, the housing 10 is structured so that the motor housing 13 and the battery mounting portion 58 are separated. As shown in FIG. 11, the motor housing 13 and the battery mounting portion 58 are attached to each other by a mounting screw 60 so that they can rotate freely relative to each other. An elastic body 61 is interposed between the motor housing 13 and the battery mounting portion 58. The elastic body 61 is made of, for example, rubber. In other words, in the nail gun 1 of the second modified example, the elastic body 61 is sandwiched between the motor housing 13 and the battery mounting portion 58 using the mounting screw 60 of the handle arm 27. As shown in FIG. 10, the handle 12 and the main housing 11 are connected via the elastic body 50. Therefore, in the nail gun 1 of the second modified example, vibrations applied to the battery as well as the handle 12 can be reduced, further improving the operability of the nail gun 1.

The present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention. For example, in the above embodiment, the elastic body 50 has a two-piece structure consisting of a left elastic body 50a and a right elastic body 50b that is assembled to the left elastic body 50a. However, the elastic body 50 may also have a structure in which the left elastic body 50a and the right elastic body 50b are integrally formed.

1...nail gun, 2...ejection path, 3...ejection port, 4...trigger, 5...blade guide, 6...stopper, 7...ejection portion, 8...push lever, 9...push lever switch, 10...housing, 11...main body housing (first part), 11a...left side main body housing (left side first member), 11b...right side main body housing (right side first member), 11c...left side main body housing fitting portion (left side first member fitting portion), 11d...left side main body housing regulating portion (left side first member regulating portion), 11e, 11f, 11g...recess (fitting portion), 11h...division line, 11i...through hole, 11j...upper portion, 11k, 1 1m, 11n...recessed step portion, 11p...lower portion, 12...handle (second portion), 12a...left handle (left-side second member), 12b...right handle (right-side second member), 12c...left handle fitting portion (left-side second member fitting portion), 12d...left handle regulating portion (left-side second member regulating portion), 12e...recessed portion (fitting portion), 12f...division line, 12g...through hole, 12h...front portion, 12i...protruding step portion, 12j...protruding portion, 12k...rear portion, 12m...handle portion, 12p...protruding step portion, 13...motor accommodating portion (third portion), 13a...left-side motor accommodating portion, 13c...front portion, 13d...rear portion , 14...connecting portion, 14a...left connecting portion, 15...control portion, 16...electric motor, 17...motor shaft, 18...reduction gear, 19...battery pack, 20...magazine portion, 20a...base member, 20b...feeder portion, 21...detection portion, 22...switch, 23...wiring, 24...holder portion, 27...handle arm, 30...impact portion, 31...plunger, 32...driver blade, 33...guide shaft, 34...weight, 35...spring, 36...weight bumper, 37...plunger bumper, 38...guide plate, 41...trigger switch, 42...first gear, 43...second gear 44...Third gear, 50...Elastic body, 50a...Left elastic body, 50b...Right elastic body, 50c...Left elastic body first mating portion, 50d...Left elastic body second mating portion, 50e, 50f, 50g, 50h...Protrusion (mating portion), 50i...Dividing line, 50j, 50k...Through hole, 50m, 50n, 50p...Protruding portion step portion, 50q...Recessed portion step portion, 50r...Groove portion, 50s...Step portion, 55...Inner metal portion, 56...Outer metal portion, 57...Elastic body, 58...Battery mounting portion, 60...Mounting screw, 61...Elastic body, A1...Center line, B1...Front-rear direction, C1...Up-down direction, D1...Downward, D2...Upward, E1...Left-right direction

Claims (11)

A work machine having a housing and a striking unit that moves in an up-and-down direction to strike a fastener,
The housing includes a first portion that supports the hitting portion and a second portion that has a handle portion that extends in the front-rear direction,
the second portion is movable relative to the first portion in the up-down direction,
an elastic body that fits into the first portion and the second portion is disposed between the first portion and the second portion in the front-rear direction;
The elastic body is
a connection surface facing in the front-rear direction;
a step portion that protrudes from the connection surface in the front-rear direction and has a circumferential surface that is fitted to an inner circumferential surface of a recess formed in the first portion so as to abut against the inner circumferential surface of the recess;
a fitting portion that is disposed within a region of the step portion as viewed in the front-rear direction, protrudes from the step portion in the front- rear direction , and fits so that a peripheral surface of the fitting portion abuts against an inner peripheral surface of a recess formed in the first portion,
The work machine, wherein the step portion and the fitting portion undergo shear deformation when the second portion moves relative to the first portion in the up-down direction. A work machine having a housing and a striking unit that moves in an up-and-down direction to strike a fastener,
The housing includes a first portion that supports the hitting portion and a second portion that has a handle portion that extends in the front-rear direction,
the second portion is movable relative to the first portion in the up-down direction,
an elastic body that fits into the first portion and the second portion is disposed between the first portion and the second portion in the front-rear direction;
the elastic body undergoes shear deformation when the second portion moves relative to the first portion in the up-down direction,
the first portion includes a right-side first member and a left-side first member assembled to the right-side first member,
the second portion includes a right second member and a left second member assembled to the right second member,
The elastic body includes a right elastic body and a left elastic body assembled to the right elastic body. The work machine described in claim 2, wherein the right elastic body is engageable with the right first member when separated from the left first member, and with the right second member when separated from the left second member. the right-side first member has a right-side first member fitting portion,
The work machine according to claim 3 , wherein the right-side elastic body has a right-side elastic body first fitting portion that fits with the right-side first member fitting portion by sliding leftward toward the right-side first member fitting portion. The work machine described in claim 4, wherein the right-side first member has a right-side first member restricting portion that restricts the right-side elastic body first fitting portion from sliding rightward and disengaging from the right-side first member fitting portion. the right-side second member has a right-side second member fitting portion,
The work machine according to any one of claims 3 to 5, wherein the right-side elastic body has a right-side elastic body second fitting portion that fits with the right-side second member fitting portion by sliding leftward toward the right-side second member fitting portion. The work machine described in claim 6, wherein the right-side second member has a right-side second member restricting portion that restricts the right-side elastic body second fitting portion from sliding rightward and disengaging from the right-side second member fitting portion. A work machine according to any one of claims 4 to 7, wherein the left-side first member, the left-side second member, and the left-side elastic body have mating portions that are shaped substantially symmetrically to the right-side first member, the right-side second member, and the right-side elastic body. a wiring extending from inside the first portion to inside the second portion;
The work machine according to claim 1 , wherein the elastic body has a through hole through which the wiring passes. The work machine described in any one of claims 1 to 9, wherein the first part and the second part are integral. the first portion has a shape extending in the up-down direction,
the second portion has a shape extending in the front-rear direction, and a front portion thereof is connected to an upper portion of the first portion via the elastic body;
The work machine according to claim 10, further comprising a third portion extending in the fore-and-aft direction, the third portion having a front portion connected to a lower portion of the first portion and a rear portion bent upward to connect to a rear portion of the second portion .