US1037323A - Pneumatic hammer. - Google Patents
Pneumatic hammer. Download PDFInfo
- Publication number
- US1037323A US1037323A US64050611A US1911640506A US1037323A US 1037323 A US1037323 A US 1037323A US 64050611 A US64050611 A US 64050611A US 1911640506 A US1911640506 A US 1911640506A US 1037323 A US1037323 A US 1037323A
- Authority
- US
- United States
- Prior art keywords
- hammer
- pawl
- piston
- pneumatic hammer
- engaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2142—Pitmans and connecting rods
- Y10T74/2144—Yieldable
- Y10T74/2147—Fluid cushion
Definitions
- My invention relates to a class of pneumatic hammers, propelled by power and used for forging metals and the object of my invention is to provide a means for raising the hammer to the top of its stroke preparatory to starting on a new piece of work.
- My invention relates more particularly to a pneumatic hammer invented and patented by me in Patent Number 989051.
- FIG. 1 is a front view of my invention.
- A represents the frame of the hammer to which is attached the belt pulley B, the crank shaft G and the pitman D, carrying the upper piston rod E.
- the air cylinder F in which are the upper or power piston E attached to piston rod V and the lower or hammer piston V attached to piston rod V.
- a spring, R holds the valve stem G in outermost position as shown in Figs. 1 and 2. In this position the valve G is open.
- the lever H has a movable bearing Ii and has attached to its lower end a pawl L engaging in corrugations on the hammer T.
- the lever II has intermediate its ends aslanting slot K that permits a rocking motion of the upper end, when the bearing K is lowered a little but when lowered farther the upper end resting on the valve stem G permits the withdrawal of the pawl Q.
- the slide I engages the outer end of pawl L at its lower end and at its upper end is wedge shaped, Fig. 2, so that as it descends it closes the air valve.
- the slide I is also wedge shaped near the lower end, Fig. 2, to gradually withdraw pawl L when depressed.
- the pawl L, Fig. 2 is made strong and the ratchet teeth on the hammer rod T are made coarse to resist the downward pressure of the hammer rod when engaged and the upper piston working.
- the pawl Q has its end rounded to engage with corrugations on the hammer rod in any posit-ion whether the pawl L is engaged or not when the pressure on the hammer is light.
- the slides H and I are carried up and down by the arms M M sliding in lugs N N on the frame.
- the arms'M M are held up by springs O O and are pulled down by rods P P connected with a pedal W at the base of the frame.
- a pneumatic hammer a supporting frame, a cylinder supported by said frame, upper and lower pistons in said cylinder, the lower cylinder having a hammer rod, said hammer rod having a series of rounded corrugations and a series ofv ratchet teeth at its lower end, a reciprocating valve and stem, a pair of spring pressed pawls, one of said pawls normally engaging said rounded corrugations and the other engaging said beveled ends, engaging said valve stem at its upper end and engaging at its lower loosely mounted in said slot, a second arm end the pawl which engages said ratchet pivoted to said slide, and means for reciproteeth, a lever engaging at its upper end eating said arms.
- valve stem and at its lower end GRIFFITH D. ROBERTS.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
G. D. ROBERTS.
PNEUMATIC HAMMER.
APPLICATION TILED JULY 25, 1911.
Patented Sept. 3, 1912.
1 At fomey lllll WITNESSES UNITED STATES PATENT OFFICE.
GRIFFITH D. ROBERTS, 0F COLUMBUS, WISCONSIN.
PNEUMATIC HAMMER.
To all whom it may concern:
Be it known that I, GRIFFITH D. ROBERTS, a citizen of the United States, residing at Columbus, in the county of Columbia and State of WVisconsin, have invented a new and useful Improvement in Pneumatic Hammers, of which the following is a specification.
My invention relates to a class of pneumatic hammers, propelled by power and used for forging metals and the object of my invention is to provide a means for raising the hammer to the top of its stroke preparatory to starting on a new piece of work.
My invention relates more particularly to a pneumatic hammer invented and patented by me in Patent Number 989051.
In the accompanying drawings wherein like reference characters refer to corresponding parts throughout the several viewsFigures 1 and 2 illustrate my invention as viewed from opposite sides. Fig. 3 is a front view of my invention.
A represents the frame of the hammer to which is attached the belt pulley B, the crank shaft G and the pitman D, carrying the upper piston rod E. To the frame A is also attached the air cylinder F in which are the upper or power piston E attached to piston rod V and the lower or hammer piston V attached to piston rod V. Between the two pistons is located the reciprocating air controlling valve G, provided with an opening to the air at 9 Fig. 1. A spring, R, holds the valve stem G in outermost position as shown in Figs. 1 and 2. In this position the valve G is open. The lever H has a movable bearing Ii and has attached to its lower end a pawl L engaging in corrugations on the hammer T. The lever II has intermediate its ends aslanting slot K that permits a rocking motion of the upper end, when the bearing K is lowered a little but when lowered farther the upper end resting on the valve stem G permits the withdrawal of the pawl Q.
The slide I engages the outer end of pawl L at its lower end and at its upper end is wedge shaped, Fig. 2, so that as it descends it closes the air valve. The slide I is also wedge shaped near the lower end, Fig. 2, to gradually withdraw pawl L when depressed.
The pawls L and Q, are pressed toward Specification of Letters Patent.
Application filed. July 25, 1911.
Patented Sept. 3, 1912.
Serial No. 640,506.
the hammer rod by springs S S, Figs. 1 and 2. The pawl L, Fig. 2, is made strong and the ratchet teeth on the hammer rod T are made coarse to resist the downward pressure of the hammer rod when engaged and the upper piston working. The pawl Q has its end rounded to engage with corrugations on the hammer rod in any posit-ion whether the pawl L is engaged or not when the pressure on the hammer is light.
The slides H and I are carried up and down by the arms M M sliding in lugs N N on the frame. The arms'M M are held up by springs O O and are pulled down by rods P P connected with a pedal W at the base of the frame.
It is operated as follows: Pressure on the foot lever pulls downward the arms M M and the slide I acts to close the air valve G. The upper reciprocating piston exerts an alternating pressure and suction on the lower piston. The lower or hammer piston is held from descending by pawl L, controlled by slide I, and by pawl Q controlled by lever H. In this situation every stroke of the upper piston lifts the hammer piston a little and the latter is held from descending by pawls L and Q, until it has reached 7 if the hammer is down it will be gradually raised to the top, or if it be stopped with the hammer down the first pressure on the pedal gradually raises it.
I am aware that pneumatic hammers controlled by lever and foot power have been made before, but
What I do claim and desire to secure by Letters Patent isr In a pneumatic hammer, a supporting frame, a cylinder supported by said frame, upper and lower pistons in said cylinder, the lower cylinder having a hammer rod, said hammer rod having a series of rounded corrugations and a series ofv ratchet teeth at its lower end, a reciprocating valve and stem, a pair of spring pressed pawls, one of said pawls normally engaging said rounded corrugations and the other engaging said beveled ends, engaging said valve stem at its upper end and engaging at its lower loosely mounted in said slot, a second arm end the pawl which engages said ratchet pivoted to said slide, and means for reciproteeth, a lever engaging at its upper end eating said arms.
with said valve stem and at its lower end GRIFFITH D. ROBERTS.
being connected to the pawl engaging said I lVitnesses:
rounded corrugations, a lever having a GEORGE E. BUNSA,
slanting slot, an arm having one end HARVEY ROWELL.
Copies of this patent may be "nbtainefl fei- 'fiire cents each, by addressing 'the Commissioner of Patents, Washington, D. C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64050611A US1037323A (en) | 1911-07-25 | 1911-07-25 | Pneumatic hammer. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64050611A US1037323A (en) | 1911-07-25 | 1911-07-25 | Pneumatic hammer. |
Publications (1)
Publication Number | Publication Date |
---|---|
US1037323A true US1037323A (en) | 1912-09-03 |
Family
ID=3105600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US64050611A Expired - Lifetime US1037323A (en) | 1911-07-25 | 1911-07-25 | Pneumatic hammer. |
Country Status (1)
Country | Link |
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US (1) | US1037323A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10592959B2 (en) | 2016-04-15 | 2020-03-17 | Walmart Apollo, Llc | Systems and methods for facilitating shopping in a physical retail facility |
-
1911
- 1911-07-25 US US64050611A patent/US1037323A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10592959B2 (en) | 2016-04-15 | 2020-03-17 | Walmart Apollo, Llc | Systems and methods for facilitating shopping in a physical retail facility |
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