US1240649A - Tool-retainer for hammer-drills. - Google Patents

Description

L. C. BAYLES.

TOUL HUMMER FOR HAMMER DRILLS.

APPUCATON FILED Mh 30. 1817.

Patented Sept. 18, 191?.

LEWis e. EAYLEs, or EASTON, PENNSYLVANIA, n ssIsNon To INGERSoLL-nnnn coMPnNY, or JERSEY CITY, NEW JERSEY, n COEPOEATIQN or NEW Jensen.

TOOL-RETAINER OR HAMMER-DRILLS.

mme-ie.

Specication of Letters Patent. ?aignted Sep-5;. 1g? 1911* Application filed January 30, 1917. Serial N o. 145,410.

To all whom z't may concern:

lie it known that l, 'LEWIS C. BAYLES, a. citizen of the United States, residing at Eastomin the county of Northampton and State of Pennsylvania,T have invented a certain new and useful Improvement 1n Tool- `Retainers for Hammer-Drills, of which the 'durable and convenient of manufacture, and

in which the supporting means for the ytool retainer are inclosed within the front head of thc hammer drill. y

-W'ith this and other objects in view my invention consists in the features of construction and operation set forth in the' following specilication and claims and illustrated in the accompanying drawings.

in the drawings which are annexed hereto and form a part of the specification,

Figure 1 is a longitudinal sectional view of the forward portion of a hammer drill with the tool retainer shown in position,

Fig. 2, a side elevation of the retainer and front head of the hammer drill,

Fig. 3, a top plan View of my tool retainer, and Fig. 4, a front elcvation'n the same.

The construction comprises a pneumatic or other tool body 1 in which a `piston 2 is adapted 'to reciprocate and strike; against the shank 3 of a drill steel or other implement 3. The drill steel 3 is retained in a 'chuck 4 contained in the front head 5 of the pneumatic tool and in which the chuck and drill are adapted to rotate. This is all a standard construction of hammer drill and forms no part of the present invention with the. exception of the front head', which is adapted to receive parts of the drill steel retainer. y l

.Upon one side of the front head 5 is mounted a cylinder 6 whose axis is at a slight angle to the longitudinal axis of the front head 5, although, if desired,- the two axes may be made' parallel. Within the cylinder 6 a plunger 7 is adapted to slide against the pressure of a compressible spring 8, also contalled in the'cylinder 6 and which rests against the plunger 7, the forward motion of the plunger 7 being opposed by the compressible spring 8. Pivotally mounted upon the plunger 7, at 9, are the side arms 10 of the tool. retaining yoke 11. The yoke 11 is shaped to embrace the drill steel 3 inA advance of the collar 12 mounted upon the` drill 3 when in the full-line position shown in the figures of the drawing, and permits thelatter to freely move forward until the collar 12 engages the yoke 11.

The object of the resilient member between the yoke -11 and the front head 5 is to absorb the shock which would occur 'if the drill steel'is not against the work at the time it is struck by the piston. This force would be so great that it would'break almost any form of rigid connection which might be used to arrest its movement. lf desired, any

other form of resilient means may be inserted in place of the compressible s ring 8, such, for instance, as a block of ruS-ber or even air under line pressure may be admitted to the cylinder 6. l

On the outside of the cylinder 6 and located on each side thereof are lugs 13 which are provided with depressions 14 and 15 in which the side arms 10 .are adapted to lodge. lVhen the side arms 10 are lodged in the depressions 14e the yoke 11 will closely embrace the drill steel for about one half its circumference and is in operative position to retain the drill steel in the tool, but when the side arms are lodged in the depressions 15 the yoke is far enough removed from the drill steel to permit the free passage of the collar 12 on the steel 3 and the yoke is therefore in an inoperative position to work as a drill steel retainer. The side members 1G, as shown clearly in Fig. 4, are shaped so that when the yoke and side members are in the position shown in dotted lines in Figs. 1 and 2 the opening between said side arms is ample for the removal of the tool.

The yoke 11 and the side larms 10 are of spring steel or other suitable material, so that while shaped to rest in the depressions 14 and 15 they have enough elasticity to permit the side arms being forced over the ridges separating the vdepressions 14 and 15 without permanent distortion.

From the above it isl thought that the operation of this tool retainer will be obvi-` ous, and it is to beunderstood that while the present showing and description discloses only one specilc embodiment of the present invention, other forms and modications are included within the spirit and scope of the same, as expressed in the claims.

What I claim is: 1. In a tool retainer of the class described, a tool, a yoke .for limiting the movementoi:l said tool, two side arms extending hack from said yoke and pivotally engaging resilient means contained within the front head of the machine 'for resisting the forward movement of the yoke and side arms.

2. In a tool retainer of the class described, a tool having -a collar on its shank, a yoke Vmovable into and out of engagement with said collar, side arms extending back from said yoke and pivotally engaging a plunger, and resilient means contained jwithinvthe front head of the machine for resisting'the forward movement of the yoke, side arms and plunger.

3. In combination with a hammer drill having a front head, a collared drill steel, a yoke adapted to engage said collar when said drill steel is forced forward, said yoke having two side arms extending back to and pivotally engaging resilient means within said front head to resist the forward move' ment of said yoke and side arms.

e. In a pneumatic tool having a front head, a cylinder mounted upon said front head, a plunger' slidable within said cylinder forwardv naadeee connecting said and side arms `pivotally drill steel plunger to a yoke embracing a inserted in said front head.

5. ln a pneumatic tool having a front head, a cylinder mounted upon said front head, a plunger slidable within said cylinder, lugs mounted on the outside of said cylinder and side arms connecting said, plunger to ayoke embracing a drill steel inserted in said front head, said lugs retaining said side members and yoke in operative and inoperative position.

6, ln combination with a hammer drill, a drill steel retainer comprising a yoke engaging said steel, side arms extending back from said yoke and pivotally engaging resilient means contained within the hammer drill for resisting thc forward movement of said yoke, and means for holding said side arms in operative and inoperative position. f

'i'. In combination with a hammer drill, a drill steel retainer comprising a yoke engaging said steel, side arms, resilient means contained within the hammer drill for resisting the forward movement of said yoke,

.and

means mounted on said hammer drill holding said side arms in operative and inoperative position. y

in testimony whereof, have hereunto set my hand.

LEWIS C. BAYLES.

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