US1747985A - Tool retainer - Google Patents

Description

2 Sheets-Sheet l 0 may Feb. 18, 1930. w. G. NAISMITH TOOL RETAINER I Filed Nov. 19. 1926 Feb. 18, 1930. w. G. NAISMITH TOOL RETAINER -File'ql Nov. 19. 1926 2 Sheets-Sheet 2 Patented Feb. 18, 1930 1" U ITED STATES PATENT' oFrlcs v 4 WILLIAM Gr. NAISMITII, OF DENVER, COLOR-ADO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OF QUINCY, ILLINOIS, A CORPORATION OF DELAWARE Application filed. November 19, 1926. Serial No. 149,480.

The object of the present invention is to providean effective retainer of a novel character' that will withstand hard usage.

i The preferred embodiment of the inven- 91 tion is illustrated in the accompanying draw- 'ings, wherein:

Figure 1 is aside elevation of the chuck of a drillingapparatus, showing the retainer in place thereon, and in its operative posi- 'tion, V

i Figure 2 is a view similar to Figure 1, but showing the retainer swung to its inoperative positio i I Figure 3 is an end elevation,

' 1 5 Figure 4: is a longitudinal sectional view,

Figure 5'is across sectional view on the line 5-5 of Figure 4,

' Figure 6 is a detail view in elevation, showing the position of the retainer when the re r21) s'istance spring is being placed,

. Figure 7 is a view in elevation of the chuck with .the other parts removed, A

' Figure Sis a sectional view on the line 8-8 of Figure 7,

"Figure 9 is a perspective view of said chuck,

' Figure10 isa perspective view of the tool retaining yoke and the carrier blocks.

-' A chuck is shown at 11, andis adaptedto be mountedon thefront end of suitable drillfa'o in apparatus. A portion of said drilling apparatus is shown in Figure 4 and'includesa barrel 12 and a hammer 13 that operates on a drill steel asv 14,"place d in the chuck 11.

This steel is providedwith a collar-'15. It is believed that the type of tool will be readily understood to those; skilled in the art. The chuck 11 is providedjon opposite sides with substantially -U-shaped guideways, each having spaced side walls 16 and17, the side wall 17 being preferably longer than the side wall 16, and having a terminal enlargement 18' with a beveled end, constituting an abutment "shoulder 19, Slidable in these guideways are carrier members in the form of blocks 20, having thereon outstanding gudgeons 21; *The front ends of these blocks 1 are curved, as'illustrated at 22,,the curvature preferably having a radius with an axis coincident to the axislof the udgeons. 1 The I '-i;o .ch1ick is" furthermore provi' edon opposite sides of the guideways with stop lugs 23, and has in its front end a peripheral annular groove 24.

The tool retainer is in the form of a yoke 25, adapted to embrace the drill steel 14: in advance of the'collar 15, and has its interior area ofless diameter than the diameter of the collar, so that when in place, as shown in Figures 1, 3 and 4, the tool cannot become dislodged'from the chuck. This yoke preferably has on opposite sides of its open portion inwardly extending lugs 26 that are adapted to engage over the collar 15 when the collar is against the yoke, and thus prevent any tendency of the yoke to open. The yokehas rearwardly extending side arms 27 provided with openings '28 that receive the gudgeons 21. Consequently the yoke is pivotally mounted on the carrier blocks 20. Said side arms further have inwardly extending lugs 29that slidably bear against the curved front shoulders 22 of the carrier blocks, and'when theyoke is swung to open position to release the drill steel, these lugs 29 abut against the shoulders 19 of the enlargements 18 of the guideways, and serve to limit the outward swinging movement of the yoke. The yoke, however, can, swing, in an opposite direction, and to a greater degree than its opening movement, when there is no drill steel in the chuck, aswill beevident by reference to Figure 6.

Surrounding the chuck is a coiled spring 30, the rear end of which bears against the lugs 29. Its front end is abutted against a holding collar 31, fitted upon the front end of the chuck. This holding collarhas an internal groove 32 that overlies and alines with the annular groove 24 in the chuck. In these'grooves'iszseated a split holding ring 33 that thus serves to effectively lock the collar against outward movement.

1 With this construction, when a steel is in splace and the yoke is in operative position, the steel can have a limited longitudinal move- Inent inthe chuck, which movementis limited by the yoke, but cannot become detached therefrom. It will be noted in connection with'this, that the spring bears against the lugs 29 and the lugs 29, in turn, bear against the gudgeon blocks As a consequence many of the shocks and jars, especially on the rearward movement of the yoke,

are transmitted directly to the blocks 20, and

by them against the rear ends of the guideways, thus relieving the gudgeons ofthe same.

When the yoke is swung-to open position, the spring then bears against the beveled ends of the lugs 29, and holds the yoke in suchposition against the stop shoulders. 19. When there is no drill steel in the chuck, the yoke can be swung to an opposite inclination, as indicated in Figure 6, in which case the spring 30 will bear against the stop lugsf23. This is a desirable relation of parts when assembling the retainer In other words, the blocks 20 are first engagedwith the yoke and put in the guideways, after which the spring 30 is placed in position, the yoke being in the position shown in Figure 6. The holding collar 31 is then slipped over the endof the chuck and passed beyond the groove 24 of -said chuck. By allowing the spring torslip downwardly against the lugs 23, it does not have to be so greatly compressed. The split retaining ring 33 is then "snapped into the groove'24, and the holding collar allowed to slide forwardly until :it covers the spring, as shownin Figure 4, whereupon the device is assembled and the yokecan then be swung to the opposite position in order to permit a steel being placed in the chuck.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention, will be apparent to those skilled in the art,:without furing the toolholder and acting on both car'- riers, and a tool retaining-yoke having pivotal connections with'both members.

2. The combination with drilling apparatus having a tool; holding chuck, saidchuck being provided with longitudinal guideways on its opposite sides, of gudgeon carriers slidably mounted in the guideways, a yokehaving side armsjournaled on the gudgeon carriers,'and a coiled spring surrounding the:

chuck in advance of-the carriers and operat ing against the same. I 3. The combination with tus having a tool holding chuck, saidchuck being provided with longitudinal guideways on its opposite sides, of gudgeon carriers slidably mounted in the guideways, a yoke havdrilling apparaing side arms j ournaled on the gudgeons carriers, and a coiled spring surrounding the chuck in advance of the carriers and abutting against the same, said chuck having an annular groove in its front end, a collar surrounding the chuck, overlying the" groove and having an internal groove, and a retaining ring in said grooves, said collar constituting an abutment for the spring. v

4 The combination with drilling apparatus having a holderfor a tool to be operated on, of aguideway on the apparatus, a carrier member slidably mounted in the guideway,

and a'tool retaining yoke having a pivotal mounting on the carrier member and having an abutment against the carrler member in addition to said pivotal mounting, to relieve the latter from shocks imparted to the yoke; 5. The combination with drilling apparatus having a holder for a tool to be, operated on, of a guideway on the apparatus, a carrier member slidably mounted in the guideway and having an abutment, shoulder, and a tool retaining yoke having a pivotal mounting on the carrier member and havinga fixed shoulder slidably engaged with the shoulder of the carrier to relievethe pivot mountingfrom shocks imparted to the yoke.

.6; The combination with drilling appara-' tus having a holder for a tool to be operated on, of a giiidewayon the apparatus, a carrier block slidably mounted in the guidewayand V having a fixed abutment shoulder, and a retaining yoke having an arm pivoted to the block and having an inset lug that slidably bears against the shoulder.v

7. The combination with tus having a holderfor a tool to be operated on, of guideways on opposite sides ofthe 3 same, carrier blocks slidably mounted in the guideways, and a tool retaining yoke having side arms that are pivotally engaged with the blocks and having sliding bearings against the ends of theblocks.

8.- The combination withldrilling appara tus'having a holderfor a'toolto be operated on, of guideways on opposite'sides of the drilling appara same, carrier blocks slidably mounted in the guideways, a toolretaining yoke having side arms that are pivotally engaged with the blocks and having sliding bearings against 1 the endsofthe blocks, and'a springsurround ing the tool holding means and having beare slidably bear against the blocks; 7

9. The combination with drilling apparatushaving a chuck forholding atool to be operated on, of a tool retaining yoke pivotally mounted on the chuck, a spring that normally' bears against theiyoke 'to resist its movement, a removable abutment for the ings againstthe portions of the arms that spring, and a stop for theiportionof the spring that bears against thevyoke, '"said spring when bearing againstthe yoke being o of ngagement, w t th step endaid yoke'being movable to a position to permit the spring to bear against the stop.

10. The combination with drilling apparatus having a chuck for holding a tool to be l operated on, of guideways on Opposite sides of the chuck, each having spaced walls, carrier blocks slidably mounted in the guideways, a tool retaining yoke pivoted to the blocks and having shoulders that bear against the ends of the Walls when the yoke is swung, and a spring surrounding the chuck and bearing against the shoulders of the yoke.

11. The combination with drilling apparatus having a chuck for holding a tool to be operated on, of guideways on opposite sides of the chuck, each having spaced walls, one of said walls being longer than the other, carrier blocks slidably mounted in the guideways, a tool-retaining yoke having side arms ivoted to the carrier blocks and having shoulders that bear against the blocks and rier blocks, a spring means on the tool holder for resisting the sliding movement of the blocks in the guideways, and abutments on the side arms that slidably engage the carrier blocks, are abutted against by the spring means and strike the guideways to limit the swinging movement of the yoke.

In testimony whereof, I aflix my signature.

WILLIAM G. NAISMITH.

the ends of the longer walls when the yoke I is swung in one direction, a spring surrounding the chuck and bearing against the shoulders of the yoke, stop lugs for the spring carried by the chuck and so disposed that p the spring will bear against them when the yoke is swung over the shorter walls, and a front abutment for said spring, removable and replaceable when the spring is against said stop lugs. a

12. The combination with drilling appara- 1 tus having a tool holder, of a carrier slidably mounted on the tool holder, a tool retainer. :pivota1ly mounted on the carrier, a spring mounted on the tool'holder for resisting the sliding movement of the carrier and retainer, and an abutment for the spring carried by the retainer at one side of its pivot axis.

13. The combination with drilling apparatus having a toolholder, of a carrier slidably mounted on the tool holder, a tool retainer pivotally mounted on the carrier, a spring fmounted' on the tool'holder for resisting the sliding movementof the carrier and retainer, and an abutment for the spring carried by the retainer at one side of its pivot axis and having a sliding bearing against the carrier.

14. The combination with drilling apparatus having a tool holder, of a carrier slidably mounted on the tool holder, a tool retainer pivotally mounted on the carrier, a spring mounted on the tool holder for resisting the sliding movement of the carrier and retainer, an abutment for the spring carried by the retainer at one side of its pivot axis and hav- Y- ing a sliding bearing against the carrier, and

a stop on the tool holder against which the pivotal movement of the retainer.

1 '15. The combination with drilling appara- 'tus having a tool holder, and guideways on opposite sides thereof, of carrierblocks slidably mounted in the guideways, a tool retaining yoke having side arms pivoted to the carabutment on theretainer strikes to limit the

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