US3713498A - Electric motor hammer and striking tool - Google Patents

Electric motor hammer and striking tool Download PDF

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Publication number
US3713498A
US3713498A US00130728A US3713498DA US3713498A US 3713498 A US3713498 A US 3713498A US 00130728 A US00130728 A US 00130728A US 3713498D A US3713498D A US 3713498DA US 3713498 A US3713498 A US 3713498A
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United States
Prior art keywords
guide rod
rollers
assembly
impact
source
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Expired - Lifetime
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US00130728A
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English (en)
Inventor
H Watanabe
S Genma
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Individual
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Individual
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Publication date
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Publication of US3713498A publication Critical patent/US3713498A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • E02D7/08—Drop drivers with free-falling hammer

Definitions

  • This invention relates to an electrical motor hammer v and striking tool, such as to be used for driving operation for construction work.
  • a weight hammer inserted into a guide rod is lifted up to some adequate height by means of a winch along the guide rod and is then dropped by releasing a stop in the winch, or a rod-like hammer is lifted by use of explosive power produced inside a cylinder and then dropped.
  • An object of this invention is to provide an electric motor hammer and striking tool in which a striking body itself formed of motors is used as driving power for striking work and such motors are lifted up to any height without use of any separate lifting means such as winches.
  • Another object of this invention is to provide an electric motor hammer and striking tool in which motors rotate two facing rollers in opposite directions through reduction gear means respectively so as to be moved up along a guide rod held by and between such rollers for giving strong impact when dropped acceleratedly by use of their own weight.
  • a still another object of this invention is to provide an electric motor hammer and striking tool in which for dropping such a device as described above automatically is provided a striking cap, which has the lower end where any object to be struck may be inserted and the upper end with a hole where the guide rod may be inserted and jointed detachably, and on the guide rod is provided a dropping plate, which is inserted freely through any of dropping plate holes made as desired on the guide rod so as to turn down a control lever to regulate the rising movement and dropping of the hammer, whereby up and down motions may be repeated as required with high driving efficiency.
  • a secondary object of this invention' is to provide an electric motor hammer and striking tool, which performs such functions as described above through very simple mechanism at low cost.
  • a hammer is given its capability of self-lifting by which the hammer can be lifted limitlessly along a guide rod just by adding other guide rods as many as required, and thus striking power may be changed as desired.
  • striking work can be carried out very effectively with very simple striking means and mechanism.
  • FIG. 1 is a front view of an electric motor hammer, showing one embodiment of an electric motor hammer and striking tool of this invention
  • FIG. 2 is a plan view of the means of FIG. 1;
  • FIG. 3 is a side view of the same
  • FIG. 4 to 9 are diagrams showing how rollers are displaced by differential gear means and relations between differential plates, to start differential operation, control members and a control lever, FIG. 4 showing how rollers hold a guide rod;
  • FIG. 5 shows how the guide rod is released from being held by the rollers
  • FIG. 6 is a front view showing part of the means of FIG. 1;
  • FIG. 7 is a plan view of the means of FIG. 6;
  • FIG. 8 is a front view of the means of FIG. 5;
  • FIG. 9 is a plan view of the means of FIG. 8;
  • FIG. 10 is a plan view of the guide rod and a striking
  • FIG. 11 is a front view of the means of FIG. 10
  • FIG. 12 is a front view showing how the electric motor hammer is used.
  • An electric motor hammer as shown in FIGS. 1 to 3 has two motors 13 and 13' arranged in parallel and fixed between upper and lower fixing boards 11 and 12 as their common supporter with bolts and nuts set vertically. Both of such fixing boards 11 and 12 have openings 15 and 16 made thereon in opposition at the center of gravity respectively so that a guide rod may be inserted therethrough.
  • rollers 17, 17 On the upper fixing board 11 is provided two rollers 17, 17 arranged in opposition on bearing plates to be described later in such a manner as to keep the guide rod 14 held in the opening 15 described above.
  • reduction gear means 18, 18, which are publicly known, are provided in opposition so as to rotate such rollers therethrough and are fixed with bolts and nuts in such positions as to make the center of gravity of the entire unit balanced with respect to the openings 15 and 16 for the guide rod 14.
  • Such reduction gears 20, 20 and 21, 21 rotate the rollers 17, 17 through four roller gears 22, 22 and 23, 23 being in differential engagement.
  • the reduction gear shafts 19 and the roller shafts 24 are supported at bothends on the bearing plates 25, 25 each having the outer end bent suitably, which are fixed on the upper fixing board 11. These shafts are properly designed and arranged according to their space relation to be described later.
  • setting holes 26 for the roller shafts 24, which are made on the bearing plates 25, are shaped like an ellipse by the necessity for displacing the roller 24 by means of differential gears on the basis of calculation of the length and direction of such displacement.
  • roller shafts 24 have portions around the center of the opening, for the guide rod 14, around which anti-slipping material such as leather and synthetic rubber are wound, where the rollers 17, 17 are fixed integrally in opposition.
  • Differential plates 27 and 28 for causing the differential gears to be displaced are set adjacent to the both ends of the rollers in such a manner as to be rotatable thereto and in parallel with each other.
  • Two control members 31, 31 are set into control windows 29 and 30 made on the differential plates 27 and 28 and are fixed commonly on a control lever 32 so as to be operated simultaneously therewith.
  • roller shafts 24 On the roller shafts 24 are firmly mounted four roller gears 22, 22 and 23, 23 adjacent to the both ends of said differential plates 27 and 28 in such a manner as to be engaged with said reduction gears 20, and 21, 21.
  • set rings 34 each holding a spring 33 at one end, which works between the roller gears 22, 22 and 23, 23 fixed on the roller shafts and the bearing plates 25.
  • This spring 33 is fixed at other end on the bent portion of each bearing plate 25 so as to give its pulling force to the gears on the roller shafts 24 and the reduction gears for their positive engagement and for setting the shafts forcibly to the outer corner of the setting hole 26 on the bearing plate 25 all the time.
  • an impact receiver 35 On the lower surface of the lower fixing board 12 is fixed an impact receiver 35, which has a hole 36 into which the guide rod 14 is inserted in alignment with the hole 16 for the same.
  • Pulleys 38 and 38" are mounted on the shafts 37 and 37 of said electric motors 13, 13 respectively, which rotation is transmitted to the reduction gear means 18, 18' via belts 39, 39' put on both pulleys 38, 38' and 40, 40 connected thereto.
  • FIGS. 4 to 9 show how the rollers are displaced by means of the differential gears and relations between differential plates, control members and the control lever.
  • the control lever 32 is turned upward so as to turn the control members 31 sidelong or horizontal, so that the differential plates 27 and 28 may be forced to move by the edges of the control windows 29 and 30 respectively, and consequently, the rollers 17 are pushed forcibly against the inner side of the setting holes 26, which have been pulled to and held at the outer corner thereof together with the roller shafts 24 by the springs 33.
  • rollers 17 facing each other are made to come closer so as to positively catch and hold the guide rod 14 therebetween.
  • the control members 31 are erected when the control lever 32 is turned down, and consequently the differential plates 27 and 28 are released from control of the control members 31, and thereby the rollers 17 are moved again together with the roller shafts 24 to v the outer corner of the setting holes 26.
  • the rollers 17 are separated so as to leave and fail to hold the guide rod.
  • FIGS. 10 and 11 show the guide rod 14, which passes through the holes 15 and 16 made on the upper and lower fixing boards 11 and 12 and the hole 36 made through the impact receiver 35 and between the two facing rollers 17, 17 and which is shaped like a square rod for easy hold therebetween, having dropping plate holes 137, 137, made as many as required at designated points thereon where a dropping plate 138 is inserted.
  • a striking cap 141 which is strong enough and has a recessed portion 139 at the lower end for receiving any object to be struck and a setting hole 40 formed at the upper end where the guide rod 14 is set detachably.
  • FIG. 12 shows how the device of this invention is used.
  • any object to be struck or driven into the ground W such as a pile 142 may be set in the recessed portion 139 at the lower end of said striking cap and is erected on the ground 7.
  • the electric motor'hammer is mounted on the guide rod 14 passing therethrough, which in turn is set at the lower end in the setting hole 140, and the dropping plate 138 is inserted through any of holes made at some desired positions along the guide rod 14.
  • control lever is turned upward so as to let the rollers 17, 17 catch and hold the guide rod 14.
  • the motors 13, 13 are driven to rotate the rollers 17, 17, which may go up to the dropping plate 138 along the guide rod 14.
  • the control lever 32 starts striking against the dropping plate 138, and is forced to turn down as they go up farther.
  • the control members 31 are erected with the result of releasing the guide rod from being held by and between the rollers 17, 17
  • rollers 17, 17 are operated by the motors 13 through the separate reduction gear means 18 widely known, which may not be always required though.
  • pulleys are coupled directly to the reduction gear shafts, to which the pulleys for the motors 13, 13 may be interconnected directly by belts, as transmission means.
  • Speed reduction in this case may be made by changing the diameters of such pulleys or by engaging the motor reduction shafts with reduction gears, which are widely known means for reducing speed.
  • reduction gear means should not be considered as any absolute requirement for this invention.
  • the device of this invention may be more simplified instructure, because reduction gear shafts, reduction gears, and roller gears engaged therewith are not required as a matter of course, if pulleys and gears are employed as means for speed reduction by which motor driving force can be transmitted directly from motor pulleys' to roller pulleys via belts put therebetween without through such reduction gear shafts.
  • the setting hole 26 made through the bearing plate 25 must be shaped like a rectangle along a circumference with a motor shaft as the center. This is because of the circular motion of the roller shaft 19 made naturally with the motor shaft as the center.
  • two electric motors 13 and 13' as described in the first embodiment are not necessarily required for this invention, one of which may be omitted if a single motor is suitable for use in respect of weight and driving force.
  • one motor must be counterbalanced with respect to the guide rod 14 by some means as heavy as the motor, which is to be fixed horizontally on the same supporter in opposition thereto.
  • An impact tool comprising, in combination,
  • a normally upright guide rod having an upper and a lower portion
  • an impact assembly mounted on said guide rod for longitudinal displacement thereon, said impact assembly comprising at least one source of drive power,
  • release means operatively connected with said rollers for releasing said rollers from engagement with said guide rod when said assembly reaches said upper portion, so as to permit gravity-descent of said assembly along said guide rod.
  • rollers having respective roller shafts; further comprising differential gears operative for driving said rollers in rotation; and wherein said release means comprise handle means movable between positions engaging and disengaging said differential gears.
  • An impact tool as defined in claim 1 said lower portion having a lower tip provided with an impact cap adapted to at least partially accommodate an object to which impacts are to be transmitted.
  • An impact tool as defined in claim 1; and furthe comprising an additional source of drive power provided on said support in balanced relationship with said one source, and also being associated with said motiontransmitting means.
  • An electric motor hammer and strikig tool comprising a normally upright guide rod having an upper portion and a lower portion;
  • said impact assembly comprising a support
  • release means operatively connected with said rollers for releasing said rollers from engagement with the guide rod when said assembly reaches said upper portion for gravity descent of said assembly along said guide rod.
  • rollers comprising respective facing roller shafts; further comprisingtwo differential plates mounted in parallel for rotation in opposite directions on the respective shafts adjacent respective endfaces of said rollers and operative for displacing differential gears of said speed reducing means, said differential plates each having at least one control window provided therein; and control members, each having a control lever integral therewith, received in the respective control windows and operative for effecting engagement or release of said guide rod by said rollers in dependence upon said levers being turned upwardly or downwardly, respectively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
US00130728A 1970-09-22 1971-04-02 Electric motor hammer and striking tool Expired - Lifetime US3713498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45082567A JPS498152B1 (de) 1970-09-22 1970-09-22

Publications (1)

Publication Number Publication Date
US3713498A true US3713498A (en) 1973-01-30

Family

ID=13778051

Family Applications (1)

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US00130728A Expired - Lifetime US3713498A (en) 1970-09-22 1971-04-02 Electric motor hammer and striking tool

Country Status (3)

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US (1) US3713498A (de)
JP (1) JPS498152B1 (de)
GB (1) GB1307322A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002082A1 (en) * 1981-12-10 1983-06-23 Cunningham, James, D. Electrically driven impact tool and method of operating the same
US4759412A (en) * 1986-10-20 1988-07-26 Brazell Ii James W Rock breaking device
US20090000799A1 (en) * 2007-06-28 2009-01-01 Ottis Charles Foster Automatic Drop Hammer
CN114344666A (zh) * 2021-12-27 2022-04-15 浙江机电职业技术学院 一种心理减压工具及其组件

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002082A1 (en) * 1981-12-10 1983-06-23 Cunningham, James, D. Electrically driven impact tool and method of operating the same
US4759412A (en) * 1986-10-20 1988-07-26 Brazell Ii James W Rock breaking device
US20090000799A1 (en) * 2007-06-28 2009-01-01 Ottis Charles Foster Automatic Drop Hammer
CN114344666A (zh) * 2021-12-27 2022-04-15 浙江机电职业技术学院 一种心理减压工具及其组件

Also Published As

Publication number Publication date
JPS498152B1 (de) 1974-02-25
DE2123040A1 (de) 1972-03-23
DE2123040B2 (de) 1975-09-11
GB1307322A (en) 1973-02-21

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