US2002762A - Electric hammer - Google Patents

Description

Mayzs, 1935. Ew BADCON 2,002,762

ELECTRIC HAMMER Filed Feb. 12, 1934 'lll /lllllllllll /4 I v ATTORNEY Patented May 28, 1935 UNITED STAT/Es ELECTRIC HAMMER Eber Watson Badcon, Seattle, Wash., assignor to Resilent Hammer, Inc., Seattle, Wash., a corporation Application February 12, 1934, Serial No. 710,9 63

1 Claim. (Cl. 125-33) This invention relates to improvements in electric hammers, or as they are sometimes called power hammers.

An object of the present inventionis to provide a hammer electrically operated to keep the cost of operation at a minimum.. y Y

Broadly, the invention comprises a power hammer with resilient means to prevent crystallization of the machine parts by having a striker backed up by'a spring in a device which will oscillate and is pivoted to a hammerbase and to have the striker in line with the tool at the time of impact, which will be revolved around on the inside of a housing at high speed to give the striker velocity which will deliver one power blow to the tool each revolution.

With these and other objects in view, as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangements of parts as will be hereinafter more fully described and claimed in reference to the drawings, in which is illustrated the embodiment there- In the drawings, Figure 1 is an elevation partly in section taken through my improved hammer.

Fig. 2 is a cross section taken through the same showing its working parts.

Similar reference gures indicate corresponding parts in the drawings. Numeral 4 designates the motor, which is provided with two handles, one on each side, and is in line with the tool and having its motor inclosed in a housing, while the forward extremity 6 is adapted to receive a tool 8. The inner portion of the tool is reduced in size and the outer portion is provided with a device III to permit it to come out a fixed distance, and is guided in bushing I2. The shank I4 of the tool is shown round to t'the bushing I2, but this may be square or hexagonal in order to keep the tool from revolving. |6iis the device that holds the striker I 8 and spring 2U. The said device is bored and counter-bored to accommodate the striker and has a. shoulder at 2|, which the spring butts against to take the shock of the blow from the machine parts. 22 is a bushing which is screwed into the device to hold the spring against the shoulder on the hammer I8. 24 is the pivot pin which device is secured to the hammer base. 26-28 is the drive shaft and is integral therewith, to which the worm gear is made fast. 30 is the hammer housing. 3| and 32 are the bearings. These bearings are shown `the jack-shaft and wormgear together.

in double ball races, but it will be understood that roller bearings may be employed. 34 and 35 are the worm and worm gear which drive the hammer base. 36 is the jack-shaft that drives the worm gear. 38 is the sleeve that couples 40 and 4I are the bearings for'the jack-shaft and worm gear. 42 is the gear that drives the worm gear, which is in mesh with motor pinion; this is secured to the motor shaft. 46 is an oil-tight bulkhead so that worm gear 35 can run in oil. Both 46 and 4l' are two removable side plates which hold the hammer bearings. The hammer base is recessed at 48 so that the device which holds the striker and spring'rnay oscillate therein to pass the tool after each revolution as it is revolved in the direction of the arrow A. 50 and 5I arecaps screwed on to hold the bearings in place. At 52 I have shown a portion of the bulkhead and motor housing broken away to show the gearing and jack-shaft. 53 and 54 are handles to hold the machine when in working position. 55 is the push button of the electric switch which turns on and off the'electric current. At 56, I have shown the electric wire. i

In operation, the shaft 28 is rotated rapidly in the direction of the arrow A, causing the hammer to deliver one blow each revolution upon the tool 8. Coupled to the shaft 28 is a worm gear which is in mesh with the worm 34, this is driven by a jack-shaft which has at its top end a gear 42 secured thereto, which is in meshV with the motor pinion 44, which is xedly secured to a mo'- tor on the inside of the housing 4. YThis motor is started by a switch in the handle at 55,`and the electric current is turned 01T and on as the operator desires.

It will be understood that this machine is not limited to any particular kind of a hammer, but may be adapted for drilling, cutting stone, cutting I cement, breaking and drilling of all kinds, such as in mines and other places.

Having thus described my invention, Vwhat I claim is:

An electric hammer comprising a casing, a hammerV base rotatably mounted in the casing, power means associated with the casing for rotating the hammer base, an arm` pivotally connected to the hammer base; a striker member carried by said arm and resilient means positioned between said striking member and said arm.

EBER WATSON BADCON.

Images