US1420196A - Tamping tool - Google Patents

Description

G. KOHLER...

TAMPING TOOL. APFLICATION FILED MAR- 5, I92].

. 1,420, 9 '7 .PatentdJune20,1922;

GUTTFB-ID KOHLER, OF BRIDGEPORT, CONNECTICUT, ASSIGNUE T0 GINGH EXPANSION BGLT & ENGINEERING COIwTPANY. OF NEW] YORK, N. 351, A CORPORATION OF NEWH YORK.-

aniac.

Application filed. March 5, 1921.

To all whom. it may concern Be it known that I, Go'rrrsm Return, a citizen of the United States, and resident of the city of Bridgeport, county of Fairlield, State of Connecticut, have invented certain new and useful Improvements in Tamping Tools, of which the following is a descrip tion.

The present invention relates to improvements in tools for use in connection with-bolt anchors of the type wherein the bolt engaging member is formed of hard metal and constitutes a male part which is adapted to expand a female part of soft metal so that the latter is caused to bind on the surrounding wall of a socket usually one formed in ceramic or cementitious material and to which it is proposed to secure a bolt.

The general object of the invention is to combine in a single tool for use in fastening bolt anchors, the properties of the several tools hitherto employed for that purpose and which usually consisted of a mandrel adapted to engage the anchor, a hammer or tamping tool with which to strike the female member and thereby cause the same to ex pand and a wrench or the like for disengaging the mandrel after effecting the locking of the anchor in position.

The use of these several tools has been cumbersome and unsatisfactory because of the time required in effecting a number of adjustments and removals which the use of several tools obviously required and additionally, because of the increased weight which the several tools gave to the workmens kit and the expense incident to re placement of one or more of the-tools in the event of loss thereof.

To this end the invention resides-in combining the properties of a mandrel and a hammer or tamping device in single tool, the hammer being adapted to move-into and out of a bolt receiving socket and thereby apply blows to the female member disposed therein. The mandrel operating in the ordinary manneruloy extending through the female member to prevent contraction of the opening thereof by the blows'of'the hammer and further operatingto engage the male member and thereby function as a guide for the hammer and lock for the tool in order to permit of rapidly operating the hammer. The invention further residing in adapting the hammer and mandrel to cooperate and Specification of Letters Patent.

respect to the said socket. stitutes the female part of the anchor and thecontour 10 thereof is enlarged with respect to the bore 7 of the part 5 sufficiently so as to initially. receive a small portion of TAMPING TOOL.

Patented June 2%, 1922,

Serial No. M9327.

permit easy detachment of the tool after the fastening of the anchor.

Other objects will appear. and be better understood from that embodiment of the invention of which the following is a specification, reference being had to the accompaying drawings forming part thereof and in which:

Figure l is a side elevation of the complete invention.

Figure 2 is a vertical cross-section on the line 22 of Figure 1.

Figure 3 is a side elevation of the device in use.

The device of the present invention is primarily intended for use in connection with a well known form of bolt anchor consisting ofthe parts 5 and 6 as shown in Figure 3. These parts are of metal. The part 5 is formed of relatively hard metal and is pro vided with an axial screw threaded bore 7 which engages the screw threaded shank of the bolt (not shown) to be secured. The part 6 is formed of relatively soft metal such .as lead and has a smooth axial bore through which the screw threaded shank of the bolt passes prior to being engaged by the part 5. The part 5 has an outer surface that slopes toward one end of the part so that the same is substantially that of a truncated cone. This part 5 constitutes the male part of the anchor. The outer surface of the part 6 .slopes like the outer surface of the part 5 except that when the parts are arranged in operatlve posltlon as shown in Figure 3, the

sloping of the part 6 is inward with respect to the direction of expansion of the socket 8 in the wall or other body 9 and the sloping of the surface of the part 5 is outward with The part 6 conthe tapered outer end of the part 5. The crosssectional area of the socket 8 is such that the parts 5 and 6 may be readily inserted there-into and when so inserted, the outer or female part is tamped or hammered and the force of this action results in forcing the part 5 into the part 6 so that the same is expanded thereby in addition to the expansion which the part 6 receives from the blows directed on its outer end.

The tool of the present invention is deindicated by 12 and is of a size to engage the screw threads of the screw threaded bore 7 of the part 5, the length of the reduced end portion 12 conforming substantially to the length of the bore 7. The length of the mandrel is such that it will extend for an appreciable distance beyond the outer end of the socket when engaged with the part 5 as just described. A tamping device or hammer 13 has a longitudinal socket 14 which loosely receives the mandrel 1.1. The

length or depth of the socket corresponds approximately to the length of the mandrel 11 and the cross-sectional area of the tamping device with respect to the socket 8 is such as to permit of the said tamping device being readily moved into and out of the socket and into and out of engagement with'the member 6. In order that the parts of the tool may be held assembled at all times, a pin and slot construction or its equivalent, is provided. In the present instance I have shown a pin 15 disposed in a transverse opening in the outer end portion of the mandrel 11 with respect to the position thereof as shown in Figure 3. The opposite ends of the pin project beyond opposite portions of the mandrel and are disposed in oppositely arranged slots 16 and 17 in the wall of the tamping device or hammer 13. This structure, it will be observed, limits the stroke of the tamping device or hammer and at the same time provides for the turning of the mandrel and the tamping device or hammer as a unit.

From the foregoing, the operation of the device will be clearly understood, it being obvious that when the parts 5 and 6 are arran ed as shown in Figure 3 and the screw threaded end portion 12 of the mandrel screwed into the bore of the part 5, the tamping device or hammer 13 may be readily reciprocated on the mandrel 11. The tamping device or hammer on each instroke thereof will strike the part 6 causing the upper end thereof to expand laterally and forcing the lower end farther upon the part 5 with the result that the outer surface of the part 6 will be forced into binding contact with the wall of the socket 8. In crushing'the part 6 to effect the expansion thereof, it will be observed that the action of the tamping device or hammer does not effect a reduction in the size of the bore 10. This, of course, is due to the presence therein of the mandrel 11. The portion of the mandrel disposed in the bore 10 is cylindrical so that after the part 6 has been crushed by the tamping device or hammer the degree of contact, if any. between the bore 10 and adjacent surface of the mandrel will not be such as to prevent ready turning of the mandrel to disengage the same from the part 5. In order to facilitate this turning of the tool to be unscrewed from the part 5, the outer end portion of the tamping device or hammer is knurled as indicated by 15, the lrnurling extending over a suflicient portion of the surface of the tamping device or hammer so that a hand-hold is provided to prevent slipping of the hand of the operator in the operation of disengaging the mandrel from the part 5.

The mandrel 11 may be formed of any material found suitable for the purpose and be of any required contour and length. As shown, the mandrel 11 is formed of a single piece of steel and is cylindrical throughout. The tamping device or hammer may also be formed of any material found suitable for the purpose and the bore 14 thereof formed by drilling through the body from one end thereof and for a distance conforming substantially t0 the length of the mandrel. In the present instance I have shown the tamping device or hammer as being formed of a single piece of steel slots 16 and 17 being out therein and of such length as will permit of a stroke on the part of the tamping device or hammer of sufficient length to be effective on the part 6.

Although I have shown and described an ideal embodiment of my invention, it is to be understood that I am not to be limited to the details of construction therein shown and I reserve the right to make such. changes as may fairly come within the scope of the claims, without departing from the spirit or sacrificing any of the ideas of the invention.

I claim:

1. A tool comprising a mandrel having a screw threaded end portion adapted to be screwed into the. screw threaded bore of the male part of a bolt anchor and further having a cylindrical portion disposed above the screw threaded portion, a tamping device slidingly mounted on the mandrel and adapted, when reciprocated, to strike and crush the soft metallic female part of the anchor surrounding the cylindrical portion of the mandrel and one end portion of the male part.

2. A tool comprising a mandrel having a reduced screw threaded end portion adapted to be screwed into the screw threaded bore of the male part of a bolt anchor and further having a cylindrical portion disposed above the screw threaded portion, a tamping

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