US2224892A - Combination tool - Google Patents

Description

Dec. 17, 1940. 3 ALLEN 2,224,892

COMBINATION TOOL I Filed Aug. 5, 1938 e iaaimT-v y INVENTOR. JUHN WALL/EN BY ATTORNEYS Patented Dec. 17, 1940 UNITED STATES COMBINATION TOOL John W. Allen, Ecorse, Mich., assignor of one-half to Henry E. Rivard, Ecorsc, Mich.

Application August 5, 1938, Serial No. 223,267

3 Claims.

This invention relates to a combination tool and particularly to a combination scriber and center punch. a

An important object of this invention is to provide a handy pocket size device combining in a. highly effective way two tools which are especially important to machinists, die makers, tool makers, metal pattern makers and others. Another important object is to provide a device which provides in a compact manner a scriber for ruling lines on metallic surfaces and a center punch for indenting marks in metallic surfaces. Another object of this invention is to provide a combination tool which is economical to make and which comprises few parts easily assembled together.

The combination tool of the present invention is a self-contained unit of elongated character containing a scriber element projectable for use from one end of the tool body but which when released for retractible movement into the body is capable of acting as a hammer upon a center punching element in the opposite end of the tool body with an impact suflicientto cause the latter to indent metallic surfaces. A meritorious feature of the invention is the provision of surfaces in the tool body and on the scriber element which slidingly fit and which at the same time form a rigid support for the scriber when projected for use. Another important feature of the invention is the novel provision which permits slight bodily movement of the center punch element at all times and which automatically prevents the parts of the tool when assembled to-.

gether from encroaching on the space provided for this bodily movement. Another important feature is the ease and convenience with which the two tool elements may be used and the manner in which the scriber element may be shifted to projected position and either self locked in such position or released for a hammer-like blow on the center punching element.

Various other objects, advantages and meritorious features will become more fully apparent from the following specification, appended claims and accompanying drawing, wherein:

Figure 1 is a longitudinal cross-sectional view through the device showing the position of the scriber element in retracted position,

Figure 2 is an outside view of the device showing the finger control and manner of moving same to advance the scriber element to projected position,

55 Figure 3 is a longitudinal cross-sectional view through the device but broken midway to show the position of the parts when the scriber element is latched in projected position, and

Figure 4 is a detail view of the center punch end of the tool showing a modified form of 5 construction.

Referring to the drawing in detail, the body of the device is of tubular character similar in length and thickness to that of a pencil and capable like a pencil of being carried in the pocket. 10 The body I!) is interiorly formed in two sections of different diameters. The larger section l2 extends nearly the full length of the body and opens directly out through one end thereof as more clearly shown in Figure 3. The other in- 15 the other end of the body.

slidably mounted in the body is a tool or scriber element having an enlarged heavy end portion 20 I6 and an elongated shank portion l8 terminating in a tapered extremity 20. When fully retracted into the body Hi, the pointed end 20 of the scriber is positioned wholly within the body while the other end of the scriber is substantially flush with the adjacent end of the body. The enlarged portion l6 of the scriber slidably fits the larger interior section H. The shank portion l8 slidably fits the smaller interior section ll. When the scriber is moved to projected position, 30 the walls of these two interior sections of the body cooperate with the surfaces of the scriber bearing thereagainst to hold the scriber from angular play relative to the body 10 of the device. This condition is shown in Figure 3.

A coiled spring 22 in the body Ill encircles the shank of the scriber. One end of this spring seats upon the shoulder 24 formed by the two interior sections of the body and the other end seats upon the enlarged portion [6 of the scriber.

It is obvious that this spring will be compressed as shown in Figure 3 when the scriber is projected from the body of the device. To advance the scriber against the tension of the spring, the' body of the device is provided with a longitudinal slot 26 through which a pin 28 on the enlarged portion of the scriber extends. To facilitate finger control of the scriber, a member 30 having a slightly curved serrated surface is secured to the pin. The slot 26 is provided with a bend '32 at its forward end which extends slightly rearwardly. The scriber may be latched in projected position against the tension of the spring by turning the pin 28 into the bend of the slot.

The end of the device opposite to that through which the scriber projects is provided with a marking or center punching instrument. The parts forming this instrument are so arranged that when the scriber is released for retractible movement, the spring forces the scriber to return at such a speed that it strikes the center punching instrument with an impact sufficient to cause the latter to indent metal surfaces such as steel. Referring to the drawing, the center punching instrument comprises a closure member or cap 34 threaded to the exterior body ill. The cap 34 is provided with a hole 36 extending therethrough on the axis of the body In. Projected through this hole is an element 38 having a pointed extremity for center punching operations. On the inside of the cap, the element 38 is provided with an enlarged head 40 which is larger than the diameter of the interior section l2 of the body so that it cannot fit into this portion and become stuck therewithin. The enlarged head functions as a stop or impact receiving surface against which the enlarged weighted end I6 of the scriber strikes.

It is desirable to allow a slight bodily movement of the enlarged head 40 and the pointed element 38 associated therewith. It is found that such bodily movement increases the depths of the indentations made by the center punch. This slight play of the center punching instrument may be provided by not tightly threading the cap to the body but it is preferred to construct the parts in such a way that when the cap is threaded tightly on the body it automatically provides the desired clearance in which the enlarged head can move.

This may be accomplished as shown in Figure 4 by shaping the end of the body upon which the cap is secured so that it has a diameter less than the rest of the body and threading this end section for receiving the cap. The shoulder 44 provided by the differences in diameter of these two section is formed on the body NJ in a position'where it brings the cap to a stop before the enlarged head 40 is tightly gripped between the cap and the end of the body [0.

The operation of the device is readily understood from the previous description. When it is desired to use the scriber to rule lines on metallic surf-aces, it is pushed out of the body In and latched in its projected position. When it is desired to use the device as a combined hammer andcenter punch, the pointed punching element 38 is positioned upon a metal surface in the correct position. The body of the device may be grasped by the fingers of one hand while the thumb of the other hand presses against the serrated secton of the control member and raises it and the scriber therewith against the tension of the spring. When the control member is released by the thumb, the enlarged heavy end of the scriber will strike the enlarged head of the center punch and give it a sufficient impact to indent metal surfaces.

What I claim:

1. A combination tool comprising, in combination, a tubular body opened at both ends, a scriber implement lengthwise movable in the tubular body having an enlarged weighted end portion slidable in the body and a tapered narrower portion projectable beyond one end of the body, the length of said implement bearing such a relation to the length of the tubular body that when the former is fully retracted within the latter the end of the tapered portion of the implement is protectingly enclosed by the wall of the body, a spring in said tubular body yieldingly resisting slidable movement of the scriber implement in the direction to project said tapered end portion. means for manually advancing the scriber implement against the resistance of the spring to project the tapered end portion from said end of the body and for releasably holding the implement in this projecting condition, a

closure member on the opposite end of the tubular body provided with a hole therethrough in alignment with the axis of the tubular body, a centering punching element projecting through the hole in the closure member and having an enlarged head on the inside of the closure member of a larger diameter than the hole therethrough, said enlarged head of the element positioned at substantially the end of the stroke of the scriber implement when the same is impelled by the spring to fully retracted position in the body whereby when the scriber implement is moved to projected position and released for return by the force of the spring the enlarged weighted end of the implement delivers a hammer-like blow to the enlarged head of the centering punching element.

2. A combination tool comprising, in combination, an elongated body bored out from one end to the other, a scriber tool slidable within the bored section of the body and projectable from one end thereof for use, said scriber tool being of such a length with respect to the body that it is capable of being retracted wholly therewithin in non-use, spring means in the body yieldingly tending to retract said scriber tool into the body, an internally threaded cap threaded to the outside end portion of the body opposite the end from which the scriber tool is projected, said cap having a hole therethrough in axial alignment with but of less diameter than the bore opening in the end of the body to which the cap is threaded, means limiting the extent the cap can be threaded upon the body so that a clearance is provided between the end of the body and the inside wall of the cap opposite the bore opening, a punching tool having a sharpened shank slidable through the hole in the cap and an enlarged head in said clearance of slightly larger diameter than the bore opening so that it cannot advance thereinto, the thickness of said head in the axial direction being less than said clearance in the same direction so that the punching tool is capable of a limited axial movement relative to the body, said scriber tool adapted when wholly retracted within the body to abut the enlarged end of the punching tool whereby when the scriber tool is projected and then released under spring pressure it will strike the enlarged head I of the punching tool with considerable impact.

3. A combination tool device comprising, in combination, a tubular body opened at both ends, a tool lengthwise movable in the tubular body having an enlarged weighted portion slidable in the body and a narrower portion having a sharpened extremity projectable beyond one end of the adapted to fully retract the tool within the tubular body, means for manually advancing the tool against the resistance of the spring to project the sharpened extremity from the body and for releasably holding the tool in this projected condition, a punch element, means to retain the punch element on the end of the tubular body opposite that from which the sharpened extremity of the tool is projectable, said element positioned in the device at substantially the end of the stroke of the tool when the same is impelled by the spring to fully retracted position in the body whereby when the tool is moved to pro jected position and released for return by the force of the spring the enlarged weighted portion of the tool delivers a hammerlike blow to the mmch element.

JOHN W. ALLEN.

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