GB1358674A - Percussion apparatus - Google Patents

Percussion apparatus

Info

Publication number
GB1358674A
GB1358674A GB27673A GB27673A GB1358674A GB 1358674 A GB1358674 A GB 1358674A GB 27673 A GB27673 A GB 27673A GB 27673 A GB27673 A GB 27673A GB 1358674 A GB1358674 A GB 1358674A
Authority
GB
United Kingdom
Prior art keywords
piston
air
cylinder
ports
compressed
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
Application number
GB27673A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YAMADA JUKI KK
Original Assignee
YAMADA JUKI KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by YAMADA JUKI KK filed Critical YAMADA JUKI KK
Publication of GB1358674A publication Critical patent/GB1358674A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D9/00Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14Control devices for the reciprocating piston
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D11/00Portable percussive tools with electromotor or other motor drive
    • B25D11/06Means for driving the impulse member
    • B25D11/12Means for driving the impulse member comprising a crank mechanism
    • B25D11/125Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

1358674 Percussive tools YAMADA JUKI KK 2 Jan 1973 [25 March 1972] 276/73 Heading B4C A percussive tool comprises a hammer piston 27, 30 free to move in cylinder 21 under the influence of air cushions developed when the cylinder is reciprocated by a rotary mechanism 17, the pressure chamber above the piston being considerably greater in volume than the one below. The crank-shaft 16 shown is turned by a gear-wheel 18 driven through a flexible drive shaft by an external I.C. engine or electric motor. A chisel 31 may be resiliently mounted and struck by the hammer piston; alternatively, the impact tool may be a ramming stamp which is attached to the hammer piston. The cylinder 21 can communicate with atmosphere via ports 25, 26 when opened by the passage of the piston. During an upstroke of the cylinder 21 with the lower ports 26 closed, the air is compressed in the lower chamber until the cushion of air is such as to move the piston on its upstroke to close the upper ports 25 and compress the air trapped in the upper chamber. During the downstroke of the cylinder 21, compression of the air above the piston is completed before the piston is compelled to move downwardly on its working stroke by the compressed cushion of air. As soon as the lower ports 26 are closed, the air trapped in the lower chamber begins to be compressed. The ports may be replaced by a single large port or a slot. Handles 37 are resiliently-mounted on buffer springs 35. The rotary mechanism on the tool may be a cam or eccentric instead of the crank shown.
GB27673A 1972-03-25 1973-01-02 Percussion apparatus Expired GB1358674A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47029888A JPS5139161B2 (en) 1972-03-25 1972-03-25

Publications (1)

Publication Number Publication Date
GB1358674A true GB1358674A (en) 1974-07-03

Family

ID=12288495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27673A Expired GB1358674A (en) 1972-03-25 1973-01-02 Percussion apparatus

Country Status (21)

Country Link
JP (1) JPS5139161B2 (en)
AR (1) AR194033A1 (en)
BE (1) BE797153A (en)
CA (1) CA973035A (en)
CH (1) CH553628A (en)
DD (1) DD101591A5 (en)
ES (1) ES411670A1 (en)
FI (1) FI60152C (en)
FR (1) FR2177742B1 (en)
GB (1) GB1358674A (en)
IE (1) IE37177B1 (en)
IL (1) IL41407A (en)
IS (1) IS1013B6 (en)
IT (1) IT980678B (en)
LU (1) LU67278A1 (en)
MY (1) MY7500038A (en)
NL (1) NL7304213A (en)
OA (1) OA04353A (en)
PH (1) PH11678A (en)
SE (1) SE387065B (en)
ZA (1) ZA731888B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU602218B2 (en) * 1987-06-17 1990-10-04 Yamada Machinery Industrial Co., Ltd. Rotary impacting apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125866U (en) * 1974-03-12 1975-10-15
JPS608641Y2 (en) * 1978-04-06 1985-03-28 カワサキ機工株式会社 Powered deep plow hoe
ATE8921T1 (en) * 1980-06-12 1984-08-15 Black & Decker Inc. POWERED TOOL WITH DEVICE FOR CONVERTING ROTARY MOVEMENT TO RECIPROCATING MOTION.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE255977C (en) *
GB191203153A (en) * 1912-02-08 1913-01-02 Thomas Ritson Improved Means for Compressing Springs, the same being especially applicable for use in connection with the Valve Springs of Internal Combustion Engines.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU602218B2 (en) * 1987-06-17 1990-10-04 Yamada Machinery Industrial Co., Ltd. Rotary impacting apparatus
US5002134A (en) * 1987-06-17 1991-03-26 Yamada Juki Co., Ltd. Rotary impacting apparatus

Also Published As

Publication number Publication date
FI60152B (en) 1981-08-31
IE37177L (en) 1973-09-25
IL41407A (en) 1975-07-28
JPS4896402A (en) 1973-12-10
IT980678B (en) 1974-10-10
DE2300388B2 (en) 1975-07-24
IL41407A0 (en) 1973-03-30
SE387065B (en) 1976-08-30
FI60152C (en) 1981-12-10
DE2300388A1 (en) 1973-10-04
IE37177B1 (en) 1977-05-25
CH553628A (en) 1974-09-13
AR194033A1 (en) 1973-06-12
ZA731888B (en) 1974-01-30
PH11678A (en) 1978-05-19
JPS5139161B2 (en) 1976-10-26
AU5165873A (en) 1974-08-01
DD101591A5 (en) 1973-11-12
MY7500038A (en) 1975-12-31
ES411670A1 (en) 1976-01-01
FR2177742B1 (en) 1975-10-31
FR2177742A1 (en) 1973-11-09
LU67278A1 (en) 1973-05-28
NL7304213A (en) 1973-09-27
IS2140A7 (en) 1973-03-23
BE797153A (en) 1973-07-16
IS1013B6 (en) 1979-09-14
OA04353A (en) 1980-01-31
CA973035A (en) 1975-08-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees
427A Application made for restoration (sect. 27/1949)
427C Application for amendment of specification now open to opposition (sect. 27/1949)
728A Order made restoring the patent (sect. 28/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19921231