US1323279A - Frank o - Google Patents

Description

F. 0. HOAGLAND.

BARREL STRAIGHTENING MECHANISM.

APPLICATION FILED OCT. 31.19!!- Patented Dec. 2,1919.

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FRANK 0. HOAGLAND, OF HARTFORD, CONNECTIOUTfASSIGNOR TO PRATT & WHITNE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY. v

' BABREL-STRAIGHTENING MECHANISLI.

Specification of Letters Patent;

Application filed October 31, 191%. Serial 110.19%),419.

To all whom it may concern: I I,

Be it known that I, FRANK g0. Hoaenann, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Barrel- Straightening Mechanism, of which the following is a specification. V y p ,This invention relates to a mechanism which is adapted to beused for straighteningthe bores of gun barrels.

The principal object of the invention is to provide'a mechanism which readily enables the operator to take into account. and compensate for the character of the curvature which he finds in the gun barrel. The machine is adapted to be readily adjusted to straighten relatively short sharp curvatimes or to straighten relativelylong gradual curvatures. Other objects of the inven-' tion will be apparent from the following specification and claims.

The invention can be embodied in any one of a large number of ways andin the accompanying drawing I have shown a rela tively simple embodiment which is entirely suitable for performing accurate work. It will be understood, however, thatthe drawing is intended to be merely illustrative and is not to be understood as defining or limiting the scope of the invention, the accompanying claims being relied upon for that purpose. I

Of the drawings Figure 1 is a front elevation with certain parts broken away and shown in section.

Fig. 2 is a vertical sectional view taken along the line 22 of Fig. 1.

8 is a detail view of the adjusting mechanism, this view being taken from the right-hand side of the machine.

I Fig. 4: is a detail sectional view taken along the line 44 of Fig. 3.

Referring to the drawing, 1 represents the base or pedestal upon which the other parts are supported. Mounted on the base or pedestal is a frame member 2 which is provided at 3 with an anvil having a horizontal top face. The anvil is provided with a longitudinal groove 4: in which are slidably fitted two shoes 5 and 6. These shoes are adaptedto support the gun barrel which is to be straightened.

For applying pressure to the barrel in the" Pate'ntedDec. 2, 1919.

7 which is preferably secured to or formed integrallywith a vertically threaded rod 8.

This rod 8 fits a vertical nut 9 which is rotatable in a bearing in the upper part of the frame member 2. For turning the nut Q there is provided a bevel gear wheel 10 which is preferably formed integrally with the nut,'as shown. This bevel gear 10 meshes with a bevel gear 11 on a horizontal shaft 12 which is rotatable in a bearing in the frame member 2. At the outer end of the shaft 12 is a hand wheel '13 by means of which the shaft may be readily turned manually. Itwill be clear.that, by means of the hand wheel, the nut 9 can be turned to raise or lower the plun er? by means of the threaded connection etween the nut andthe rod 8.

Preferably, in order to prevent thefrod 8 from turning with the nut 9, there is provided a clip 14: which is secured to the frame member 2 and which carries at its inner end a key 15- projecting into a keyway 16 in the rod In order that the mechanism may 'be adapted for the straightening of either short sharp bends in a barrel or long gradual bends, the two shoes 5 and. 6 are adjustable towardand away from the plunger .7. It is essential that the two shoes be maintained at equal distances from the plunger, or in other words, it is essential that the plunger be at all times midway between the two shoes. I provide an equalizing mechanism whereby I insure the movement of the two shoes to equal extents in opposite directions. As concerns certain phases of the invention, I do not limit myself to any particular form of mechanism for this purpose, but I prefer to provid ajshaft 17 which extends parallelly with the groove 4 in the anvil 3. At the center below the plunger 7 the shaft 17 extends through a block 18 which is held against longitudinal movement. At each side of the block the shaft is provided with block hold the shaft against longitudinal movement. The two end parts of the shaft 17 extend respectively through the shoes 5 and 6 and are provided with similar but oppositely inclined threads which are preferably of sharp pitch. Secured to the shoes 5 and 6 and engaging the ends of the shaft 17 are nuts 20 and 21. It will be clear that any rotative movement of the shaft 17 will cause the two shoes to move outward or inward to the same extent, thus maintaining them at equal distances from the plunger. Preferably the pitch of the threads on the shaft 17 is such that either shoe may be moved manually to impart a rotative movement to the shaft and thus move the other shoe in the opposite direction.

Under some circumstances I prefer not to depend solely upon one or the other of the shoes for imparting rotative movement to the shaft 17. It is sometimes desirable to provide a separate mechanism for this purpose and such a mechanism is illustrated.

As shown, the anvil 3 carries at its righthand end a bearing block 22 and the shaft 17 is extended to have a bearing in this block. Secured to the end of the shaft 17 is a pinion 23. A segemental gear 24: meshes with the pinion 23 and is mounted on a pivot pin 25 which has a bearing in the block 22. The segmental gear 2st carries a handle 26 by means of which it may be turned. It will be clear that the operator, by moving the handle 26, can turn the shaft 17 and thus move the shoes 5 and 6 in either direction and to any desired extent, at the same time maintaining them at equal distances from the central plunger 7.

The errors of the barrel to be straightened can be determined in any usual or preferred way. If preferred, a special mechanism may be provided for ascertaining these errors, or they may be noted by sighting through the barrel in the well known manner. The mechanism as illustrated is particularly adapted for use with the sighting method and for the convenience of the operator in sighting I have provided a rest 27 upon which the end of the barrel can be supported. Preferably, as shown, this rest is at an elevation somewhat above that of the shoes so as to support the barrel at an elevation which is convenient for the operator. The operator supports one end of the barrel on the rest 27 and observes the direction of the curvature and also observes whether it is long or short. He adjusts the shoes 5 and 6, preferably by means of the handle 26, in accordance with the length of the curve. Then he places the barrel on the shoes and turns it to the proper position. By turning the hand wheel 18 he moves the plunger downward into engagement with the barrel and applies the required pressure to straighten it. This operation is repeated until all of the curvatures of the barrel have been removed and it 18 straight throughout.

It is sometimes desirable to slightly in-.

. pedestal is forked and a depending portion of the frame member is positioned between the two forks. A pivot pin 28 extends through these parts and the frame member with the parts carried thereby may be adjusted on this pivot pin. After adjustment the nut 29 on the pin may be turned to clamp the two forks of the pedestal against the frame member and thus lock the frame member in adjusted position.

What I claim is:

1. in a machine for straightening gun barrels, the combination of a base, a frame carried by the base and having a horizontal recess therein open at one side, two barrel engaging shoes positioned at the bottom of the recess, a plunger projecting into the recess from the top and vertically movable along a line midway-between the shoes and intersecting the axis of a barrel on the shoes, a manually operable device at the rear of the frame opposite the open side of the recess for moving the plunger to apply to the barrel any pressure that the operator may deem necessary, and manually operable means for moving the shoes toward or from each other while automatically maintaining them equidistant from the plunger.

2. In a mechanism for straightening gun barrels, the combination of a base, a frame carried by the base and having a horizontal recess therein open at one side, two barrel engaging shoes positioned at the bottom of the recess, a plunger projecting into the recess from the top and vertically movable along a line midway between the shoes and intersecting the axis of a barrel on the shoes, a manually operable device at the rear of the frame opposite the open side.

of the recess for moving the plunger to apply to the barrel anypressure that the operator may deem necessary, an oppositely threaded longitudinal shaft for moving the shoes toward or from each other while automatically maintaining them equidistant from the plunger, and a handle at one end of the frame adjacent the recess for turning the shaft.

3. In a mechanism for straightening gun barrels, the combination of a base, a frame carried by the base and having a horizontal recess therein open at once side, two barrel engaging shoes positioned at the bottom of the recess, a plunger projecting into the recess from the top and vertically movable along a line midway between the shoes and intersecting the axis of a barrel on the distant from the plunger, and a barrel rest shoes, a manually operable deviceat the rigidly secured to the frame adjacent the top 10 rear of the frame opposite the open side of of the recess whereby the operator may supthe recess for moving the plunger to apply port the barrel for convenience in sighting.

any desired pressure to the barrel that the In testimony whereof, I hereto afiix my operator may deem necessary, means for signature.

moving the shoes toward or from each other While automatically maintaining them equi- FRANK O. HOAGLAND.

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