US1712437A

US1712437A - Locking device for handles

Info

Publication number: US1712437A
Application number: US155983A
Authority: US
Inventors: Francis A Jimerson
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1926-12-20
Filing date: 1926-12-20
Publication date: 1929-05-07
Anticipated expiration: 1946-05-07

Description

May 7, 1929. F. A. JIMERSON LOCKING DEVICE FOR HANDLES Filed Dec. 20, 1926 INVENTOR. fivoa/slilimersa/z.

M'J'ATT NEY.'

Patented May 7, 1929.

UNITED STATES PATENT OFFICE.

FRANCIS A. JIMERSON, 0F ATHENS, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

LOCKING DEVICE FOR HANDLES,

Application filed December 20, 1926. Serial No. 155,983.

This invention relates to pneumatic tools but more particularly to a device for securing certain parts of the tool in their relative posi-' tions.

One object of this invention is to enable the front head of the tool to be held securely in place relative to the cylinder din-ing the operation of the tool and similarly to hold the cylinder securely in place with reference to the back head or hood.

Further objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the features of construction and combination of elements substantially as hereinafter described and more particularly pointed out in the appended claim and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal partial sectional elevation of a pneumatic hammer tool constructed in accordance with the practice of the invention.

Figure 2 is a plan view in section taken through Fig. l on the line 22 looking in the direction of the arrows, and

Figure 3 is a plan view in section taken through Fig. 1 on the line 33 looking in the direction of the arrows.

Referring to the drawings A is the cylinder of a pneumatic hammer tool having the front head B and the back head or hood C. Blows of impact are delivered to the drill steel S by the reciprocating hammer piston D which is actuated by motive fluid entering the tool atld and distributed by a valve (not shown) on the back head or hood C. The admission of motive fluid is controlled by a throttle not shown) operated by a'trigger F in the handle G. The front head B has an internally threaded recess into which is screwed a corrcspondingly threaded portion of the front end of the cylinder A. The rear end of the cylinder A is externally threaded and is screwed into a threaded recess in the back head C.

The vibration of the tool during its operation frequently causes the threaded portions above referred to to become unscrewed and it is an object of this invention to prevent this accidental unscrewing. To this end longitudinal slots T are provided in the cylinder A and the front head B. A helical spring J coiled about the cylinder A has its ends K bent so as to lie parallel to the axis of the spring coil. After the front head B is screwed into place one of the ends K of the spring J is placed in one of theslots T on the cylinder A. The tension of the spring is then increased by giving the free end of the spring a partial turn. The free end is then inserted into one of the slots K on the front head B. The tension of the spring acting through the slots on the cylinder and front head constantly tends to screw these parts more tightly together.

In a similar manner a helical spring J surrounds the cylinder A and has its longitudinally extending ends K and L disposed in the longitudinal slots O and P of the back head C and the cylinder A respectively.

A cylindrical exhaust deflector or guard Q is mounted over the spring J and upon the cylinder A. The upper end K of the spring J projects through a slot R in the flange U of the guard Q. In assembling the tool the end L of the spring J is placed in the slot P and the spring is compressed by grasping the deflector or guard Q and holding it down ward while the hood C is screwed into position. After the hood C is screwed into position the guard Q is grasped and twisted so as to produce a torsional stress in the spring J so that the said spring is under combined torsion and compression when in its operating position. The compression holds the guard Q, up against the front end ofthe hood G and at the same time keeps the ends K and L of the spring J engaged in their respective slots. The torsion tends to keep the handle screwed tight onto the cylinder or barrel A. I claim: In a pneumatic tool the combination of a cylinder and a back head, a reciprocating piston in said cylinder adapted to be operated by pressure fluid, threaded portions on said back head and said cylinder whereby said back head and said cylinder are adapted to be screwed together, an exhaust port in said cylinder, a helical spring coiled about one 0i inder and said back head to maintain said said threaded portions, longitudinally exthreaded port-ions screwed together, said 10 tending ends on said helical spring, longituspring guard covering said exhaust port and dinal slots in said back head and in said oyl deflecting exhaust motive fluid.

inder, a spring guard adapted to engage one In testimony whereof I have signed this end of said spring for tensioning said spring, 1 specification.

said longitudinally extending ends adapted to engage said longitudinal slots in said cyl- FRANCIS A. J IMERSON.