GB2165794A - Percussion implement - Google Patents

Percussion implement Download PDF

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Publication number
GB2165794A
GB2165794A GB8525134A GB8525134A GB2165794A GB 2165794 A GB2165794 A GB 2165794A GB 8525134 A GB8525134 A GB 8525134A GB 8525134 A GB8525134 A GB 8525134A GB 2165794 A GB2165794 A GB 2165794A
Authority
GB
United Kingdom
Prior art keywords
drive member
implement
head portion
percussion
push rod
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.)
Granted
Application number
GB8525134A
Other versions
GB8525134D0 (en
GB2165794B (en
Inventor
Helmut Schmied
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB8525134D0 publication Critical patent/GB8525134D0/en
Publication of GB2165794A publication Critical patent/GB2165794A/en
Application granted granted Critical
Publication of GB2165794B publication Critical patent/GB2165794B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B25D11/062Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/351Use of pins

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Automatic Assembly (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

A hand-held percussion implement has a pneumatic (air-cushion) drive member 1 vibrated via a radially-extending tumble member 6; rotation of the drive member 1 is prevented by a projection 13 of the tumble member 6 being embraced by a pair of parallel pin elements 14, 15. The pin elements are mounted through bores 18 (19, Figure 2 not shown) in an extension 17 of the drive member 1 into blind bores 18' (19') in the rear wall 16 of the drive member 1, and are located immediately above a bearing sleeve 4 for a round head portion 5 of member 6. <IMAGE>

Description

SPECIFICATION Percussion implement The present invention relates to a percussion implement and more particularly to a hand-held hammer drilling tool such as a drifter. The drifter may have a percussion mechanism which contains a piston-like drive member which is guided in a cylindrical guide tube and which, by pneumatic means, sets in reciprocating motion a percussion member, which is freely movable axially, which percussion member delivers its energy in the form of axial blows to a tool guided in the drifter.The drive member may be set in oscillatory motion by an electric motor through a tumble member which comprises a push rod extending radially and provided with a rounded head portion, the rounded head portion being mounted in a rear extension of the piston-like drive member, the push rod continuing radially beyond the head portion and this continuation being prevented from tangential movement in the rear extension of the drive member.
In order to secure the drive member against rotation, it has already been proposed to guide the continuation of the push rod in a plate which is provided with a slot and which is disposed in a rear extension of the drive member (De-PS 33 35 305).
Such a retaining plate, including its mounting, is, on the one hand, expensive and, on the other hand, has proved inadequate in so far as there is a risk of the plate becoming detached during operation and hence of destruction of the drive piston.
The present invention seeks to provide a means of securing the drive member against rotation which is simple in construction and easy to mount and with which the risk of detachment is eliminated.
According to the present invention there is provided a percussion implement having a drive member which pneumatically causes reciprocation of an axially-movable percussion member for delivering axial blows to a tool inserted in the front of the implement, the drive member being vibrated by a tumble member having a round head portion and a radially extending push rod, the round head portion being mounted in a rearward extension of the drive member and the tumble member having a radially extending portion on the side of the head portion remote from the push rod, wherein rotary movement of the drive member is prevented by two parallel spaced pin elements which embrace said radially extending portion, the pin elements being held in the rear wall of the drive member and the end wall of the rearward extension.
A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 shows a partial section through a drive member actuated by a tumble drive; Figure 2 shows a plan view of the drive member; and Figure 3 shows a view on the section A - B through Figure 2.
As can be seen from Figure 1, the drive member 1, is constructed in the form of a hollow piston and with an air cushion reciprocates the percussion member 2, which is freely movable axially. The drive member includes at its rear end an extension 3 in which a bearing sleeve or ring 4 is inserted.
Guided in the bearing sleeve 4 is the spherically rounded head 5 of a push rod 6 which, extending radially, is fitted to the outer ring of a ball bearing arrangement 8. The ball bearing arrangement is disposed inclined at an angle CC to the axis 9 of an intermediate shaft 10 which carries and drives a shaft member 12 provided with a suitably inclined seat 11 for the ball bearing 8.
The continuation 13 of the push rod, projecting beyond the rounded head portion 5, id guided betwenn two dowel pins 14, 15 which are disposed spaced apart and extend parallel to one another and which are held or anchored, on the one hand, in the rear wall 16 of the drive member and, on the other hand, in the end wall 17 of the rear extension 3 of the drive member.
The two dowel pins 14 and 15 are inserted in two through bores 18, 19 in the end wall 17 of the extension 3 and are pressed forwards until they come into engagement with the blind bores 18', 19' in the wall 16 of the drive member. In this connection see also Figures 2 and 3.
With such securing means, a rotary movement of the drive member in the circumferential direction is prevented. The torque acting on the drive member results from a component of force acting on the push rod 6 in the rotational direction and the displacement travel of the centre of the head portion 5. The pins 14, 15 may be in the form of clamping sleeves or cylindrical pins.
1. A percussion implement having a drive member which pneumatically causes reciprocation of an axially-movable percussion member for delivering axial blows to a tool inserted in the front of the implement, the drive member being vibrated by a tumble member having a round head portion and a radially extending push rod, the round head portion being mounted in a rearward extension of the drive member and the tumble member having a radially extending portion on the side of the head portion from the push rod, wherein rotary mo9- ment of the drive member is prevented by two parallel spaced pin elements which embrace said radially extending portion, the pin elements each being held in the rear wall of the drive member and the end wall of the rearward extension.
2. An implement as claimed in Claim 1, wherein the pin elements are in the form of clamping sleeves.
3. An implement as claimed in Claim 1, wherein the pin elements are in the form of cylindrical pins.
4. An implement as claimed in any preceding claim, wherein the pin elements are located immediately above an end face of a bearing sleeve in
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Percussion implement The present invention relates to a percussion implement and more particularly to a hand-held hammer drilling tool such as a drifter. The drifter may have a percussion mechanism which contains a piston-like drive member which is guided in a cylindrical guide tube and which, by pneumatic means, sets in reciprocating motion a percussion member, which is freely movable axially, which percussion member delivers its energy in the form of axial blows to a tool guided in the drifter.The drive member may be set in oscillatory motion by an electric motor through a tumble member which comprises a push rod extending radially and provided with a rounded head portion, the rounded head portion being mounted in a rear extension of the piston-like drive member, the push rod continuing radially beyond the head portion and this continuation being prevented from tangential movement in the rear extension of the drive member. In order to secure the drive member against rotation, it has already been proposed to guide the continuation of the push rod in a plate which is provided with a slot and which is disposed in a rear extension of the drive member (De-PS 33 35 305). Such a retaining plate, including its mounting, is, on the one hand, expensive and, on the other hand, has proved inadequate in so far as there is a risk of the plate becoming detached during operation and hence of destruction of the drive piston. The present invention seeks to provide a means of securing the drive member against rotation which is simple in construction and easy to mount and with which the risk of detachment is eliminated. According to the present invention there is provided a percussion implement having a drive member which pneumatically causes reciprocation of an axially-movable percussion member for delivering axial blows to a tool inserted in the front of the implement, the drive member being vibrated by a tumble member having a round head portion and a radially extending push rod, the round head portion being mounted in a rearward extension of the drive member and the tumble member having a radially extending portion on the side of the head portion remote from the push rod, wherein rotary movement of the drive member is prevented by two parallel spaced pin elements which embrace said radially extending portion, the pin elements being held in the rear wall of the drive member and the end wall of the rearward extension. A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 shows a partial section through a drive member actuated by a tumble drive; Figure 2 shows a plan view of the drive member; and Figure 3 shows a view on the section A - B through Figure 2. As can be seen from Figure 1, the drive member 1, is constructed in the form of a hollow piston and with an air cushion reciprocates the percussion member 2, which is freely movable axially. The drive member includes at its rear end an extension 3 in which a bearing sleeve or ring 4 is inserted. Guided in the bearing sleeve 4 is the spherically rounded head 5 of a push rod 6 which, extending radially, is fitted to the outer ring of a ball bearing arrangement 8. The ball bearing arrangement is disposed inclined at an angle CC to the axis 9 of an intermediate shaft 10 which carries and drives a shaft member 12 provided with a suitably inclined seat 11 for the ball bearing 8. The continuation 13 of the push rod, projecting beyond the rounded head portion 5, id guided betwenn two dowel pins 14, 15 which are disposed spaced apart and extend parallel to one another and which are held or anchored, on the one hand, in the rear wall 16 of the drive member and, on the other hand, in the end wall 17 of the rear extension 3 of the drive member. The two dowel pins 14 and 15 are inserted in two through bores 18, 19 in the end wall 17 of the extension 3 and are pressed forwards until they come into engagement with the blind bores 18', 19' in the wall 16 of the drive member. In this connection see also Figures 2 and 3. With such securing means, a rotary movement of the drive member in the circumferential direction is prevented. The torque acting on the drive member results from a component of force acting on the push rod 6 in the rotational direction and the displacement travel of the centre of the head portion 5. The pins 14, 15 may be in the form of clamping sleeves or cylindrical pins. CLAIMS
1. A percussion implement having a drive member which pneumatically causes reciprocation of an axially-movable percussion member for delivering axial blows to a tool inserted in the front of the implement, the drive member being vibrated by a tumble member having a round head portion and a radially extending push rod, the round head portion being mounted in a rearward extension of the drive member and the tumble member having a radially extending portion on the side of the head portion from the push rod, wherein rotary mo9- ment of the drive member is prevented by two parallel spaced pin elements which embrace said radially extending portion, the pin elements each being held in the rear wall of the drive member and the end wall of the rearward extension.
2. An implement as claimed in Claim 1, wherein the pin elements are in the form of clamping sleeves.
3. An implement as claimed in Claim 1, wherein the pin elements are in the form of cylindrical pins.
4. An implement as claimed in any preceding claim, wherein the pin elements are located immediately above an end face of a bearing sleeve in the rearward extension for the round head portion of the tumble member.
5. An implement as claimed in any preceding claim, wherein the drive member is located in a cylindrical guide tube.
6. An implement as claimed in any preceding claim, wherein the drive member is vibrated via the tumble member by an electric motor.
7. A hand-held implement according to any preceding claim.
8. A percussion implement substantially as herein described with reference to the accompanying drawings.
GB8525134A 1984-10-18 1985-10-11 Percussion implement Expired GB2165794B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843438208 DE3438208A1 (en) 1984-10-18 1984-10-18 HAND-DRIVEN HAMMER DRILLING MACHINE WITH DRIVE LINK SAFE

Publications (3)

Publication Number Publication Date
GB8525134D0 GB8525134D0 (en) 1985-11-13
GB2165794A true GB2165794A (en) 1986-04-23
GB2165794B GB2165794B (en) 1987-09-30

Family

ID=6248215

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8525134A Expired GB2165794B (en) 1984-10-18 1985-10-11 Percussion implement

Country Status (4)

Country Link
CN (1) CN1004476B (en)
CH (1) CH668028A5 (en)
DE (1) DE3438208A1 (en)
GB (1) GB2165794B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256906A (en) * 1990-12-05 1992-12-23 Milwaukee Electric Tool Corp Wobble plate drive
GB2415661A (en) * 2004-05-28 2006-01-04 Bosch Gmbh Robert An anti-rotation mechanism for a reciprocating saw
US7797841B2 (en) * 2006-08-29 2010-09-21 Robert Bosch Gmbh Drive mechanism for a reciprocating saw

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2507689Y2 (en) * 1991-05-09 1996-08-14 リョービ株式会社 Hammer drill
DE19850369A1 (en) * 1998-11-02 2000-05-04 Schaeffler Waelzlager Ohg Swash gear for an impact tool
GB0428210D0 (en) * 2004-12-23 2005-01-26 Black & Decker Inc Mode change mechanism
DE102008040765A1 (en) * 2008-07-28 2010-02-04 Robert Bosch Gmbh impact device
EP2601017A1 (en) * 2010-06-09 2013-06-12 Bosch Power Tools (China) Co., Ltd. Striking mechanism
DE102015203487A1 (en) 2015-02-26 2016-09-01 Ecoroll Ag Werkzeugtechnik Clamping device for influencing workpieces and associated method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3335305C1 (en) * 1983-09-29 1984-08-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Hand-held hammer drill

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256906A (en) * 1990-12-05 1992-12-23 Milwaukee Electric Tool Corp Wobble plate drive
GB2415661A (en) * 2004-05-28 2006-01-04 Bosch Gmbh Robert An anti-rotation mechanism for a reciprocating saw
GB2415661B (en) * 2004-05-28 2006-06-07 Bosch Gmbh Robert Anti-rotation mechanism for a reciprocating saw
US7168169B2 (en) 2004-05-28 2007-01-30 Robert Bosch Gmbh Anti-rotation drive mechanism for a reciprocating saw
US7797841B2 (en) * 2006-08-29 2010-09-21 Robert Bosch Gmbh Drive mechanism for a reciprocating saw

Also Published As

Publication number Publication date
GB8525134D0 (en) 1985-11-13
DE3438208A1 (en) 1986-04-24
DE3438208C2 (en) 1987-07-16
CH668028A5 (en) 1988-11-30
CN85106839A (en) 1986-04-10
CN1004476B (en) 1989-06-14
GB2165794B (en) 1987-09-30

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee