US988029A - Hammer-drill. - Google Patents

Description

W. 'PRELLWITZ.

HAMMER DRILL.

APPLICATION FILED AUG.19. 1909.

Patented Mar. 28, 191T.

Wwaaea= UNITED STATES PATENT OFFICE.

WILLIAM PRELLWITZ, OF EASTON, PENNSYLVANIA, ASSIGNOR TO ING-ERSOLL-BAND COMPANY, OF NEW YORK, N. Y., CORPORATION OF NEW JERSEY.

HAMMER-DRILL.

Application filed. August 19, 1909. Serial No. 513,684.

To all whom it may concern:

Be it known that I, WILLIAM PmiLLwrrz, a citizen of the United States, and resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Hammerl )rills, of which the following is a specification.

This invention relates to hammer drills and has for its principal object to provide a very simple and inexpensive attachment for the drill, which may be readily brought into and out of position for use as a retainer for limiting the outward movement of the drill steel when it is not striking its work.

In the accompanying drawings, Figure 1 represents the front portion of a hammer drill in top plan. with my tool retainer-applied thereto in its 0 erative position, the type of drill shown belng that in which the steel does not rotate with respect to the drill,

Fig. 2 is a cross section taken in the plane of the line AA of Fig. 1, looking in the direction of the arrows, Fig. 3 represents the front portion of the hammer drill shown in Fig. 1, in side elevatidn with my tool retainer applied thereto in its operative "position, the inoperative position of the retainer being shown in dotted lines, Fig. 4 is a longitudinal central section taken in the plane of the line BB of Fig. 3, looking in the direction of the arrows, and Fig. '5 represents the front portion of a hammer drill in top plan with my tool retainer applied thereto in its operative position, the drill shown in this figure being of thetype in which the drill steel rotates.

In the form shown in Figs. 1130.4;1110111- sive, the drill cylinder is denoted by 1, it's hammer piston by 2, its drill steel by 3 and the drill steel chuck by' l. The drill steel is provided with two oppositely arranged elongated transverse recesses 5,. 6, located adj acent to the chuck 4. The cylinder 1 is provided with two diametrically opposed holes 7, 8, for receiving the inwardly turned ends 9, 10, of the side arms 11, 12, of the'retainer, for pivoting the retainer to the cylinder.

. The cylinder 1 is further provided with diametrically opposed recesses 13, let, in front of andin almement'with the holes 7, 8,. for receiving offset portions 15, 16,"in the side arms ll, 12, of the retainer. The laterally arranged connecting portion at the} outer ends. of the side arms 11,12, is bent to form a yoke 17, the sides 18,19, of which, when the device is in its operative position, are fitted to embrace the drill steel 3 within the elongated transverse recesses 5, 6, at the outer ends of said recesses so as not to interfere with the operation of the steel under the impact of the hammer piston 2.

In the form shown in Fig. 5, where the drill steel is rotatable with respect to the drill cylinder 1, the steel is provided with a Specification of Letters Patent. Patented Mar. 28, 1911..

circumferential shoulder 20 adjacent to the chuck i and the yoke 17 is brought into en-' gagement with the steel at a point spaced from the shoulder 20 when the retainer is in its operative position. This retainer is formed from av single strip of spring wire, the'tension on the side arms 11 and 12 being such as .to tend to force them together so that when the retainer is swung into its operative position, the offset portions 15, 16, of the side arms 11 and 12 W111 snap into the recesses 13, 14, for yieldingly holding the retainer in its operative position. This spring tension also serves to hold the inwardly turined ends 9 and 10 within their holes 7 an 8.

In operation, when the drill is in use, the

retainer may be swung out of its operative position. When the operator wishes to withdrawthe drill steel partially or wholly from the hole, as, for instance, for the purpose of permitting the material to be blown out of the steel, wherea hollow steel is used,

insertion and removal of the drill steel is provided for.

While Ihave shown and described this retainer in connection with a hammer drill,

it is to be understood that it could be used equally well in connection with tools of variousother types without departing from the spirit and scope of my invention, thegist of which is toprovide a novel, simple and position with respect to its holder when the tool is not in use. I

What I claim is inexpensive retainer forret-aining a tool in 1. A tool steel, its holder and a tool steel eeaoee retainer comprising a wire bent to form a yoke for embracing the'steel and side arms pivoted to the holder.

2. A tool cylinder, a tool steel and a tool steel retainer comprising a Wire bent to form a yoke for embracing thesteel and spring side arms pivoted to the cylinder, the cylinder and retainer being constructed to yieldingly hold the retainer in its operative position.

3. A toolcylinder having diametrically opposed holes and recesses, a tool steel and a tool steel retainer comprising a wire bent to form a yoke for embracing the steel and side arms having inwardly turned ends located in said holes and ofiset portions for entering said recesses to yieldingly hold the retainer in its operative position.

I. As an article of manufacture, a tool steel retainer comprising a wire bent to form side arms and a laterally arranged tool steel embracing yoke connecting the outer ends of the side arms.

5. As an article of manufacture, a tool steel retainer comprising a wire bent to form side arms and a laterally arranged tool steel embracing yoke connecting the outer ends of the side arms, the inner ends of the side arms being turned inwardly to form pivots.

6. As an article of manufacture, a tool steel retainer comprising a wire bent to form side arms and a laterally arranged tool steel embracing yoke connecting the outer ends of the side arms, the inner ends of the side arms being turned inwardly to form pivots,

the said side arms having offset portions thereon to form yielding stops.

7. A- tool cylinder, a tool steel having a recessed portion, and a tool steel retainer comprising a yoke for embracing the steel at 40 the recessed portion, and side arms pivoted to the cylinder.

, In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this sixteenth day

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