JPH0224625Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for adjusting the center of gravity of a hammer.

(Prior Art) A common hammer has a metal striking head at the tip of the handle. When hammering thick nails, a hammer with a heavy head is used to obtain a large impact force. This allows nails to be driven in with fewer hits. Also, when hammering thin nails, use a hammer with a light head so that a small impact force can be obtained. This prevents the nail from bending.

(Problems to be solved by the invention) As mentioned above, multiple types of hammers had to be prepared depending on the thickness of the nail, which was uneconomical. Furthermore, when working outdoors, for example, it is inconvenient to have to carry multiple hammers to the work location.

(Means for Solving the Problems) The present invention was made to solve the above problems, and its gist is that an auxiliary weight is supported on the handle of a hammer so as to be slidable in the longitudinal direction of the handle; The hammer center of gravity adjusting device is characterized by comprising a fixture for fixing the auxiliary weight to the handle at a desired position.

(Function) The center of gravity of the hammer is adjusted by sliding the auxiliary weight along the handle of the hammer. That is, when driving a thick nail, the auxiliary weight is moved closer to the hammer head, and when driving a thin nail, the auxiliary weight is moved away from this head. In this way, one hammer with a center of gravity adjustment device can handle driving multiple types of nails.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 1 to FIG. 3.

As shown in FIG. 1, the hammer 10 includes, for example, a wooden handle 11 and a metal striking head 12 attached to the tip 11a (the left end in the figure) of the handle 11. ing.

The handle 11 of the hammer 10 is provided with a center of gravity adjusting device 20, which is a feature of the present invention. This center of gravity adjustment device 20 includes an auxiliary weight 21 and a fixing screw 22.
(fixing tool). The auxiliary weight 21 has a hole 21a in the center, and is slidably supported in the longitudinal direction of the handle 11 by passing the handle 11 through the hole 21a. Also, auxiliary weight 2
1 is a screw hole 21 extending in a direction perpendicular to the hole 21a.
It has b. The fixing screw 22 is screwed into the screw hole 21b, and when the tip of the fixing screw 22 is pressed against the handle 11, the frictional force therebetween prevents the auxiliary weight 21 from sliding.

In the above configuration, the auxiliary weight 21 can be slid to a desired position with the fixing screw 22 loosened, and is fixed to the handle 11 by tightening the fixing screw 22 at this desired position. By changing the position of the auxiliary weight 21 in this manner, the center of gravity of the hammer 10 can be adjusted.

When driving a thick nail, as shown in FIG. 2, the auxiliary weight 21 is positioned near the head 12 and the center of gravity is moved closer to the tip 11a of the handle 11. In this state, if you hold near the base end 11b (right end in the figure) of the handle 11 and swing down the hammer 10,
Because it generates a large amount of kinetic energy, it can drive nails with a large impact force. Therefore, even thick nails can be driven in with a small number of hits.

When driving a thin nail, as shown in FIG. 3, the auxiliary weight 21 is positioned near the base end 11b of the handle 11, and the center of gravity is moved toward the center of the handle 11. When the handle 11 is held near the center in this state, the moment caused by the head 12 is weakened by the moment caused by the auxiliary weight 21, using this gripping position as a fulcrum. As a result, the tip 11a of the handle 11
The situation is almost the same as when a light head is attached to the handle, and by swinging down the handle 11 with a delicate force, it is possible to drive a nail with a small impact force. Therefore, even if the nail is thin, it will not bend.

The present invention is not limited to the above embodiments and can be modified in various ways. For example, a strong leaf spring (fixing tool) may be attached inside the hole of the auxiliary weight, and the auxiliary weight may be fixed by the frictional force between the leaf spring and the handle.

In addition, a recess is formed inside the hole of the auxiliary weight, and a coil spring and a ball (fixing device) biased by the coil spring are housed in the recess. A plurality of recesses may be formed and the auxiliary weight may be fixed by engagement between the balls and the recesses.

Furthermore, a member having a high coefficient of friction such as rubber may be used as the fixture.

(Effects of the Invention) As explained above, in the present invention, by adjusting the center of gravity of the hammer, it is possible to drive multiple types of nails with one hammer, which is economical and convenient. Further, according to the present invention, since the auxiliary weight is fixed to the handle using the fixture, the weight does not move and become difficult to operate.

[Brief explanation of the drawing]

The drawings from Fig. 1 to Fig. 3 show one embodiment of the present invention, Fig. 1 is a sectional view of the center of gravity adjusting device provided on the handle of the hammer, Fig. 2 and Fig. 3 are FIG. 3 is a side view showing different usage modes of the center of gravity adjustment device. DESCRIPTION OF SYMBOLS 10... Hammer, 11... Handle, 12... Hitting head, 20... Center of gravity adjustment device, 21... Auxiliary weight, 22... Fixture (fixing screw).

Claims (1)

[Scope of utility model registration request] A hammer center-of-gravity adjusting device comprising: an auxiliary weight slidably supported on the handle of the hammer in the longitudinal direction of the handle; and a fixture for fixing the auxiliary weight to the handle at a desired position.