JP2014100774A - Strong long bit holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong long bit holder capable of coping with strong rotational torque by stably, smoothly and surely holding a bit, capable of reducing transmission of heat, and capable of quickly coping with even breaking of the bit.SOLUTION: The bit 5 is composed of a structure insertable into both ends of a shaft body 1 of a long shaft, and the bit 5 is pivoted by a cap 3. The shaft body 1 is also pivoted by a handle 2. Strong screw-driving by the bit 5 becomes possible in a state of gripping the handle 2. Further, this bit holder is for executing the screw driving and boring by imparting high rotational torque to the bit by power of an electric driver. This bit holder is also composed of a structure having strength more than the bit and breaking the bit first.

Description

  The present invention relates to a long-axis strong type long bit holder having a bit insertion hole on both sides while holding bits that require a strong rotational torque such as a hole saw or a gym socket pin.

  The work requires a long shaft structure, and there is a demand in the industry for a strong type long bit holder that can function safely, smoothly and reliably with respect to transmission of strong rotational torque. However, there are no known bit holders that satisfy the above-described requirements as known techniques, and “Patent Document 1” and “Patent Document 2” can be cited as those having somewhat similar structures.

Japanese Patent Laid-Open No. 2002-166373 (FIG. 1) Japanese Utility Model Publication No. 5-85560 (Fig. 1)

  The “bit holder” of “JP-A-2002-166373” of the above “Patent Document 1” is provided with an overload absorbing portion (6) in an intermediate portion to absorb overload caused by vibration or impact during use, thereby increasing commercial value. It is characterized by a structure to be raised, and is not of a long axis as in the present invention, but has a pivotal support means by a bearing, but is greatly different in the structure and has a bit insertion hole on both sides is not.

The “bit holder” of “Japanese Utility Model Publication No. 5-85560” of “Patent Document 2” has a structure for the purpose of improving the fitting and dismounting operation and durability of the bit. Although used, the overall structure differs greatly from the present invention.
According to the investigation by the applicant of the present invention, there are no disclosure examples of the long bit, and there are no features having characteristics such as smooth rotation and heat transferability.

  The present invention was devised in view of the above circumstances, has sufficient strength to withstand strong rotational torque, can operate safely, smoothly and reliably, and can be used even in continuous use. Provided is a strong long bit holder which has many advantages such as low transferability and formation of bit insertion holes on both sides, so that even if the bit breaks, it can be used continuously by replacement. For the purpose.

  In order to achieve the above object, the present invention is a bit holder suitable for a case where a strong rotational torque is required, and the bit holder inserts the bit on both sides. A long shaft body for forming a bit insertion hole, a long shaft handle for pivotally supporting the shaft body via a bearing structure, and the bit inserted into the bit insertion hole of the shaft body. And a cap for pivotally supporting the bit through the ball.

  According to the strong type long bit holder of the first aspect of the present invention, the long long bit holder is composed of a long axis as a whole, and can be used conveniently and safely at a use site requiring the long axis. In addition, since the bearing structure is used in various places, smooth operation can be performed, and the way of heat transmission in continuous use is reduced, so that the durability can be improved and the handle portion can be grasped with bare hands. In addition, there are bit insertion holes on both sides, and the work can be continued continuously even if the bit is broken, so that the work efficiency can be improved. Further, the pivot support structure by the bearings is compact and robust, and has an advantage that it can sufficiently withstand a strong rotational torque.

1 shows the overall structure of a strong long bit holder according to the present invention, wherein (a) is an external view, (b) is a cross-sectional view taken along the line AA of (a), and (c) is between the shaft body and the handle. The BB expanded sectional view of (b) which shows the structure of the provided bearing. The expanded fragmentary sectional view which shows the detail of the pivot structure by a bearing.

  Hereinafter, embodiments of the strong long bit holder of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1A and 1B, a strong long bit holder 100 according to the present invention includes a long shaft body 1, a long shaft handle 2 that pivotally supports the shaft body 1, and a shaft body 1. The cap 3 etc. which pivotally support the bit 5 inserted in the bit insertion hole 4 formed on both sides of the head.

  As shown in FIGS. 1 and 2, the shaft body 1 is fitted with a V-shaped groove 7 into which a small steel ball 6 is fitted, a through hole 9 into which a large steel ball 8 is inserted, and a C-type retaining ring 10 at both axial ends. It consists of what forms the groove | channel 13 etc. in which the groove | channel 11 and the crescent retaining ring 12 fit.

  As shown in FIGS. 1 and 2, the handle 2 is composed of a pipe-like member having a shape that pivotally supports the shaft 1 at both ends thereof. Specifically, the bearing collar 14 is fitted at both ends, and is connected to the shaft body 1 through the small steel balls 6. The bearing collar 14 is restrained from moving toward the end of the shaft body 1 by the crescent retaining ring 13. With the above structure, the handle 2 is pivotally supported by the shaft body 1 with its left-right motion restricted.

The cap 3 pivotally supports the bit 5 inserted into the bit insertion hole 4 through the large steel ball 8 and is restrained from moving by a C-type retaining ring 10. As described above, the C-type retaining ring 10 is fitted into the shaft body 1 through the groove 11, and the C-type retaining ring 10 on the most end side restrains the movement of the spring retaining ring 16 that holds the spring 15. The shaft body 1 is fitted in a state.
Further, the large steel ball 8 is arranged in contact with the outer periphery of the ball holding reduced diameter portion 17 formed on the bit 5. With the above structure, the large steel ball 8 is brought into contact with the reduced diameter holding portion 17 by the cap 3 to prevent the bit 5 from coming off. And it is elastically held by the spring 15.

  Since the strong long bit holder 100 of the present invention has the above structure, the bit 5 inserted into the shaft body 1 is stably and smoothly held by the shaft body 1 and the handle 2 is secured to the shaft body 1. Since the shaft body 1 can rotate smoothly, the shaft body 1 can operate stably even with a strong rotational torque, and has an effect that heat is not easily transmitted to the handle 2. Further, since the bit 5 can be inserted at both ends, even if the bit 5 is broken, it can be dealt with continuously, and a reduction in work efficiency can be prevented.

  The strong type long bit holder 100 of the present invention has the contents described above. However, the present invention is not limited to the contents described above, and those of the same technical category are of course applied.

  The strong type long bit holder 100 of the present invention can correspond to the bits of all structures, and its use range is extremely wide. Further, the dimension of the long axis can be selected as appropriate, and the diversity of the structure can be achieved.

DESCRIPTION OF SYMBOLS 1 Shaft 2 Handle 3 Cap 4 Bit insertion hole 5 Bit 6 Small steel ball 7 V groove 8 Large steel ball 9 Through hole 10 C type retaining ring 11 Groove 12 Chrysene retaining ring 13 Groove 14 Bearing collar 15 Spring 16 Spring retaining ring 17 Reduced diameter part for pole holding 100 Strong type long bit holder

Claims (1)

A bit holder suitable for a case where a strong rotational torque is required, the bit holder having a long shaft body that forms a bit insertion hole for inserting the bit on both sides, and the bearing via the bearing. A long handle for pivotally supporting the shaft, a ball disposed in contact with an outer periphery of a reduced diameter portion for holding a ball formed in the bit inserted into the bit insertion hole of the shaft, and the ball A strong long bit holder characterized by comprising a cap for pivotally supporting the bit via a ball.