US3757409A

US3757409A - Impact tool

Info

Publication number: US3757409A
Application number: US00203319A
Authority: US
Inventors: J Flanigan
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-11-30
Filing date: 1971-11-30
Publication date: 1973-09-11
Anticipated expiration: 1990-09-11

Abstract

An impact tool including a rod, a weight slidable on the rod, a stop on the rod and means at each end for engaging an element, whereby movement of the weight striking the stop will impart a pulling force of an element secured to one end of the rod and will impart a pushing force to a similar element engaged by the other end of the rod.

Description

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Flanigan Sept. 11, 1973 1 IMPACT TOOL 2,623,415 12/1952 Dawson 7 1 R x [76] Inventor: James C. Flanigan, P. O. Box 405, 2779089 M957 Allen Haywood, W. Va. 26366 Primary ExaminerJames L. Jones, Jr. [22] led: 1971 Assistant ExaminerJ. C. Peters Appl. No.: 203,319

Attorney-Dos T. Hatfield [57] ABSTRACT An impact tool including a rod, a weight slidable' on the rod, a stop on the rod and means at each end for engaging an element, whereby movement of the weight striking the stop will impart a pulling force of an element secured to one end of the rod and will impart a pushing force to a similar element engaged by the other end of the rod.

2 Claims, 5 Drawing Figures IMPACT TOOL BACKGROUND OF THE INVENTION Machines used in coal mining, commonly known in the trade as Jeffrey miners, Joy rippers and the like, comprise a rotary driven head which has a plurality of coal cutting bits secured to the head. A forward force is applied to the rotary head and the bits engage the vein of coal to rip or strip pieces of coal from the vein. In a number of such machines, the bits are frictionally held in the rotary support, usually by means of a spring ring. From time to time the bits, or at least the cutting tips thereof, become broken, damaged, or otherwise rendered ineffective for their intended purpose and it becomes necessary to remove the damaged bit and replace the same with a new bit. While there are impact tools (not especially adapted for the purpose of removing and inserting a coal bit in a ripper machine) which could be modified to remove a bit, none are known to exist wherein a single tool is capable of removing a damaged bit and inserting a new bit in the machine.

SUMMARY The impact tool includes relatively few parts, only one of which is movable, and can be simply constructed although effective to accomplish the function set forth in the Background of the Invention. The tool comprises an elongated rod having a slidable weight thereon, a stop against which the weight strikes and engaging constructions at each end of the rod so that the striking force of the weight against the stop will impart a pulling force on an element secured to one end of the rod and will impart a pushing force to a similar element secured to the other end of the rod.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of the impact tool; 7 FIG. 2 is a side view, partly in section, of the impact tool;

FIG. 3 is a sectional view taken on line 3-3 of FIG. 2'

FIG. 4 is a side view of only a-portionof the tool, as i shown in FIG. 1; while FIG. 5 is a view similar to FIG. 3 but showing a modification of the invention. I

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 through 4, it will be seen that the impact tool comprises a rod 10 having a cylindrically shaped weight 12 mounted thereon, the weight 12 having an enlarged head 13 welded or otherwise permanently secured to the weight 12. A circular diskshaped stop 14 is fixedly secured, in any suitable manner, to the rod 10 and faces the enlarged head 13 of the weight 12. At the opposite end of the rod 10 is a head 16 rigidlysecured thereto by means of triangularly shaped braces 17, the braces 17 being welded to the rod 10 and to the head 16. The head 16 is provided with an arcuate slot 18. A socket 20 has a portion encircling one end of the rod 10 and is permanently secured thereto, the inner end of the socket abutting the circular stop 14. The head 21 of the socket is provided with a tapered bore 22. 7

As shown in FIG. 2, the slot 18 in the head 16 is adapted to enter a groove B of bit, generally indicated by the reference character B. The bit B has a spring ring B encircling a reduced shank portion of the bit B and also has a coal-engaging tip B which is formed by tapering the bit B. The tapered portion of the bore 22 of socket 20 is complementary in shape to the tapered portion of the bit B.

In operation, the tool is positioned so that the slot 18 in the head 16 engages the groove B in the bit B, after which the weight 12 is moved sharply in the direction of the arrow shown in FIG. 2 so that the enlarged head 13 of the weight strikes the stop 14 to impart an impact pulling force on the bit B. The operation may be repeated until the bit B is removed from its support. After removal, a new bit may then be inserted in the tapered socket 22 with the bit tip B positioned inwardly and the shank portion with the spring ring B extending outwardly of the socket head 21. A striking force of the weight 12 against the stop 14 thereby imparts an impact pushing force on the bit B to insert the 'bit into its frictionally held position on the support of the coal mining machine.

MODIFICATION OF THE PREFERRED FORM OF THE INVENTION A modification of the preferred form of the invention is shown in FIG. 5. The modification relates only to the head 16 wherein, instead of having only a single arcuate slot 18, additional slots 18' and 18" are formed in the head, the slots 18' and 18" being of gradually smaller dimensions than slot 18 so as to accommodate different sized bits B, particularly different sized slots B formed in the bits. Modification of the tapered bore 22 in the head 21 of socket 20 has not been found necessary as only a portion of the tapered portion of the bit B need be inserted in the tapered slot 22 to hold the bit during the impact pushing of the same.

What is claimed is:

1. An impact tool for removing and replacing a frictionally held coal mining bit having a tapered cutting point and a groove intermediate its ends comprising a rod, a weight slidably mounted on said rod, a stop secured to said rod inwardly of one end thereof, a head secured to said rod at the other end having a slot to engage the groove in the bit, and a socket secured to the end of said rod adjacent said stop, said socket being tapered to correspond to the shape of the tapered cutting point of the bit, whereby the slot on said-head is adapted to engage the groove in the bit, the weight adapted to slide on said rod and strike said stop to thus impart an impact pulling force on the bit, and said socket is adapted to hold a different but similar bit and the impact of said weight against said stop imparts an impact pushing force on the similar element.

2. An impact tool as set forth in claim 1 wherein said head has a plurality of slots of different sizes.

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Claims

1. An impact tool for removing and replacing a frictionally held coal mining bit having a tapered cutting point and a groove intermediate its ends comprising a rod, a weight slidably mounted on said rod, a stop secured to said rod inwardly of one end thereof, a head secured to said rod at the other end having a slot to engage the groove in the bit, and a socket secured to the end of said rod adjacent said stop, said socket being tapered to correspond to the shape of the tapered cutting point of the bit, whereby the slot on said head is adapted to engage the groove in the bit, the weight adapted to slide on said rod and strike said stop to thus impart an impact pulling force on the bit, and said socket is adapted to hold a different but similar bit and the impact of said weight against said stop imparts an impact pushing force on the similar element.