US1630686A - Apparatus for grinding gun barrels - Google Patents

Description

Patented May 31, 1927.

v UNITED STATES JACOB LOWE YOUNG, OF NEW YORK, N. Y.

.AI'IPARATUS FOR GRINDING GUN BARBELS.

Application filed Ianuary 14, 1925. Serial No. 2,315.

This invention relates to the art of grinding the bores of gun barrels and one of its objects is 'to provide an apparatus whereby the actual grinding may be done by a suitable grinding paste such as carborundum paste.

A further object of the invention is to provide means to readily feed the grinding paste to the bore of thegun barrel during the grinding opeiation and to insure the uniform grinding of the bore.

. A still further object is to provide an apparatus, of the type above mentioned, of simple construction and designed to-facilitate the mounting and adjustment of the gun barrels and tools for the grinding operation.

In the drawings Fig. l is a top plan view of the grinding apparatus;

Fig. 2 a longitudinal section on the line 2-2 of Fig. 1; and

Fig. 3 a transverse section on the line 3 3 of Fig. 2. v

Referrin to the parts of the apparatus by numera s, 1 and 2 designate a pair of spaced-parallel side rails rigidly supported by transverse supporting members 3 and 4.

Supported by the side rails 1 and 2 andadapted to slide longitudinally therebetween is a carriagefor supporting the gun barrels to be ground. This carriage com rises a pair of transversely extending en members 5 and (i'spaced apart almost the length of the gun barrels and rigidly connected together by rods 7 The opposed inner faces of the guide rails 1 and 2 are formed with guide grooves 8 adapted to slidably receive guide ribs 9 formed upon'the carriage end members 5 and 6. The carriage is thus supported for ion itudinal sliding movement between the si e rails. Each of the carriage endmembers is formedat its upper edge with a pair of notches 10 adapted to receive the barrels B of a double-barrel shot gun. The barrels are adapted to be removably secured to the members 5 and 6 by means of clamping members 11 and 12- respectively. The said clamping members are hinged to the carriage end members at one side of the gun barrels and are adapted to be extended across the barrels and pressed downwardl 'by means of thumb screws 13 adapted to e threaded into the carriage end members.

The transverse rail-supporting member 4 has a pair of tool-driving shafts 14 and 15 journaled in bearings therein and keyed to said shafts on the outer side of the member.

4 are meshing gears 16 and 17. The shaft- 14 1s power-driven by means, not shown, and through the gears 16and 17 rotates the shaft 15 in unison therewith.

i A pair of tubular grinding tools 18 are lnserted through the breech ends of the gun barrels prior to placing them upon the carriage. These tools are tapered to correspond to the taper of the choke bore 19.0f the barrels and are of a length ,to extend entirely through the barrels and beyond the muzzle. The breech end of each tool is closed and centrally formed with a squared tapered extension 20. These ta ered extensions of the tools are adapte to be removably received in correspondingly shaped sockets 21 formed in the ends of the tooldriving shafts 14 and 15 inwardly of the supporting member 4. This provides a centering and driving connection for the tools. The muzzle ends of the tools are open and the tools are adapted to be rotatably supported within bearings carried b the railsupporting member 3. The sai bearings are formed with a hinged upper half 22 adapted to extend across the tools and to be secured in place by a thumb screw 23. The space 24: within the tubular tools is adapted to be filled with a suitable grinding paste, such as carborundum paste, prior to mountin the tools and the barrels for grinding. i plunger 25 is inserted within the open end of each tool, said plungers being adapted to slidingl fit within the tools and having outward y extending operating stems 26 of material length. The space 18 within the tool is in communication with the outer, or grinding face 27 of the tool through perforations 28 spaced over the whole grinding face.

The outer ends of the plunger stems 26 are formed with spaced shoulders 29 and between said shoulders the stems are adapted to be removably received in upwardly opening notches 30 formed at the upper side of a plunger-operating crosshead 31. The crosshead 31 is slidably mounted between the side rails land 2, in a manner similar to the mounting of the gun barrel carriage, and is adapted to be moved longitudinally back and forth by means of a screw 32. The screw 32 is swiveled at one end upon across bar 33 fixed to the side rails, is. adapted, to

be turned by means of a knurled head 34, I

and is threaded through the cross head 31.

The gun barrels are adapted to be accurately adjusted with relation to the grinding faces of the tools by means of an adjusting screw 35. This screw is swiveled to the fixed cross bar 33 below the screw 32, extends inwardly through the crosshead 31 and the rail-supporting member 3 and is threaded through the end member 5 of the gun barrel carria e. The screw 35 is adapted to be by a knob 36 having graduations around its edge which cooperate with an index member 37 upon the bar 33 to accurately indicate the carriage adjustment. When the carriage is moved to the right with reference to Figs. 1 and 2, by the screw, the internal surfaces of the barrels are moved into closer contact with the tapered tools. Any thrust upon the tools resulting from said adjustment will be received b ball bearings 38 interposed between shou ders upon the drive shafts 14 and 15 and the inner face of rail-supporting member 4. Endwise movement ofthe tools to the left is prevented by stop ribs 39 upon the tools which abut the tool hearings in the sup porting member 4.

When the gun barrels, the tools and the plungers have been properly assembled and mounted in the apparatus for grinding the power is turned on the shaft,l4 and both tools will be rotated. B turning the plunger-operating screw 32 tie plungers may be moved inwardly to force the grmding paste 'within the tools out through the perforations in the grinding faces. This may be done whenever it is considered necessary in the course of the rinding operation to supply more paste. he erforations are closely spaced over the grin ing faces of the tools and the hydrostatic ressure caused by the movement of. the p on ers will force the paste out equally throng all of the perforations. The barrels will therefore be ground uniformly. As the grinding progresses the barrels may be moved into closer contact with the tools to the required degree by merely turning the screw knob 36. Q To remove the barrels after the'grindin is completed, the screw head 36 is turned back to retract the barrel carriage and permit the tool-driving connections 20 and 21 to be separated. The clamps 11 and 12 and the upper bearing member 22 are next released and swung back. The barrels, the tools and the plungers are then free to be lifted from their supports as a unit. In order to facilitate and speed up the grinding of a large number of barrels, several airs of tools and plungers may be provide for each apparatus in order that one assembled unit of barrels, tools and plungers maybe inserted as soon as the first unit is removed. The removed tools are then withdrawn from the ground barrels, inserted in a pair of unground barrels and re-charged with paste,

if necessary, while the barrels mount-ed upon the apparatus are being ground.

What I claim is:

An apparatus for grinding the bore of a gun barrel comprising a supporting frame including track means; a carriage mounted to travel upon said track means and adapted to support a gun barrel; an elongated, hollow, tapered grinding tool formed with a perforated grinding face, said tool being open at'one end and closed at the other end and adapted to be filled with inding paste; a plunger adapted to be shifted within the open end of the tool to force the paste out through the perforations and provided with an outwardly projecting stem; a tool-rotating shaft mounted upon the supporting frame at one end of the track; a loose drivshaft and the tool; bearing means designed to rotatably and releasabl support the open ing connection between the closed end of said end of the tool; releasab e clamping means to hold the barrel upon the carriage; means to adjust the carriage and barrel longitudinally with relation to the tool; and mechanical pusher means supported by the frame to engage the plunger stem and force the lunger inwardly, the said pusher means,

caring means, clamping means, and tool driving connection being adapted to permit the barrel, the tool and the plunger to be removed transversely as a unit from the carriage and the supporting frame.

In testimony whereof I hereunto aflix my signature.

JACOB LOWE YOUNG.

Images